阅读说明：本技术 轮胎成型用模具、轮胎成型用模具的制造方法及轮胎 (Tire molding die, method for manufacturing tire molding die, and tire ) 是由 石原泰之 小林直人 于 2018-11-07 设计创作，主要内容包括：轮胎成型用模具具备胎面压花体,该胎面压花体由在轮胎成型用模具的周向上排列的多个压花体分段构成,对轮胎的胎面接地面进行压花,所述压花体分段具有：主体部,其将所述轮胎的胎面接地面的外轮廓成型；以及多个突条部,其从该主体部沿所述轮胎成型用模具的径向延伸,对所述轮胎的胎面接地面赋予沟形状,所述多个突条部包含第1突条部和与该第1突条部交叉地延伸的第2突条部,其中,所述第1突条部在该第1突条部的侧面具备凹部,该凹部沿所述轮胎成型用模具的径向延伸,所述第2突条部在该第2突条部的端部具备连接部,该连接部具有与所述凹部嵌合的形状,所述连接部嵌合于所述凹部。(A mold for tire molding comprising a tread embossing body which is composed of a plurality of embossing body segments arranged in the circumferential direction of the mold for tire molding and which embosses the tread surface of a tire, the embossing body segments comprising: a main body portion that molds an outer contour of a tread contact surface of the tire; and a plurality of protrusions extending from the main body portion in a radial direction of the tire molding die and providing a groove shape to a tread surface of the tire, the plurality of protrusions including a 1 st protrusion and a 2 nd protrusion extending so as to intersect with the 1 st protrusion, wherein the 1 st protrusion includes a recess extending in the radial direction of the tire molding die on a side surface of the 1 st protrusion, and the 2 nd protrusion includes a connecting portion having a shape to be fitted into the recess at an end of the 2 nd protrusion.)

1. A tire molding die comprising a tread embossing body composed of a plurality of embossing body segments arranged in the circumferential direction of the tire molding die, the tread embossing body embossing the tread contact surface of a tire,

the embossed body segment has: a main body portion that molds an outer contour of a tread contact surface of the tire; and a plurality of protrusions extending from the main body in a radial direction of the tire molding die and forming a groove shape in a tread contact surface of the tire,

the plurality of protruding strip portions comprise a 1 st protruding strip portion and a 2 nd protruding strip portion extending to intersect with the 1 st protruding strip portion,

the 1 st projection has a recess on a side surface of the 1 st projection, the recess extending in a radial direction of the tire molding die,

the 2 nd protruding strip has a connecting portion at an end of the 2 nd protruding strip, the connecting portion having a shape fitted in the concave portion,

the connecting portion is fitted in the recess.

2. The mold for tire molding according to claim 1, wherein,

a projection extending in a direction intersecting a radial direction of the tire molding die is formed on the connecting portion of the 2 nd projection portion, and a projection receiving portion corresponding to the projection is formed on the recess of the 1 st projection portion.

3. A method for manufacturing a tire molding die, characterized by obtaining a tire molding die provided with a tread embossing body composed of a plurality of embossing body segments arranged in the circumferential direction of the tire molding die, the tread embossing body embossing the tread contact surface of a tire,

the embossed body segment has: a main body portion that molds an outer contour of a tread contact surface of the tire; and a plurality of protrusions extending from the main body in a radial direction of the tire molding die and forming a groove shape in a tread contact surface of the tire,

the plurality of protruding strip portions comprise a 1 st protruding strip portion and a 2 nd protruding strip portion extending to intersect with the 1 st protruding strip portion,

the method for manufacturing the tire molding die comprises the following steps:

a recess forming step of forming a recess extending in a radial direction of the tire molding die on a side surface of the 1 st protruding portion;

a connecting portion forming step of forming a connecting portion having a shape fitted to the concave portion at an end portion of the 2 nd protruding portion; and

and a fitting step of fitting the connecting portion into the recess.

4. The method of manufacturing a mold for tire molding according to claim 3,

the fitting process further comprises the following steps:

a protrusion forming step of providing a protrusion extending in a direction intersecting a radial direction of the tire molding die at an end of the 2 nd protrusion; and

and a protrusion receiving portion forming step of providing a protrusion receiving portion corresponding to the protrusion in the recess of the 1 st protrusion.

5. A tire, characterized in that,

the tire is manufactured by using the mold for tire molding according to claim 1 or 2.

6. A tire molding die comprising a tread embossing body composed of a plurality of embossing body segments arranged in the circumferential direction of the tire molding die, the tread embossing body embossing the tread contact surface of a tire,

the embossed body segment has: a main body portion that molds an outer contour of a tread contact surface of the tire; and a plurality of protrusions extending from the main body in a radial direction of the tire molding die and forming a groove shape in a tread contact surface of the tire,

the plurality of protruding strip portions comprise a 1 st protruding strip portion and a 2 nd protruding strip portion extending to intersect with the 1 st protruding strip portion,

when a mold portion corresponding to an amount of 1 pitch of a tread pattern given to a tread contact surface of the tire is set as a mold minimum unit,

at least part of the 1 st projection and at least part of the 2 nd projection of at least the minimum unit of the mold are integrally formed.

7. The mold for tire molding according to claim 6, wherein,

the 1 st protruding strip and the 2 nd protruding strip have an embedded portion embedded in the main body portion of the tread pattern body and an exposed portion exposed from the main body portion,

in a cross-sectional view of the tire forming mold in the width direction, the embedded portions all extend in the same direction.

8. The mold for tire molding according to claim 6 or 7, wherein,

the thickness of the embedded portion of the 1 st protrusion and/or the 2 nd protrusion is thicker than at least a part of the 1 st protrusion and/or the 2 nd protrusion.

9. The mold for tire molding according to claim 7 or 8, wherein,

the embedded portions of the 1 st protrusions and/or the embedded portions of the 2 nd protrusions adjacent to each other in the circumferential direction of the tire forming mold are connected by a connecting member.

10. The mold for tire molding according to any one of claims 6 to 9,

the main body of the embossed body section has a vent hole for communicating the inner peripheral surface side and the outer peripheral surface side of the embossed body section, and

a ventilation slit is provided between the main body portion of the embossed body segment and the embedded portion of the 1 st ridge and/or the 2 nd ridge,

the vent slit is connected to the vent hole.

11. A method for manufacturing a tire molding die, characterized by obtaining a tire molding die provided with a tread embossing body composed of a plurality of embossing body segments arranged in the circumferential direction of the tire molding die, the tread embossing body embossing the tread contact surface of a tire,

the embossed body segment has: a main body portion that molds an outer contour of a tread contact surface of the tire; and a plurality of protrusions extending from the main body in a radial direction of the tire molding die and forming a groove shape in a tread contact surface of the tire,

the plurality of protruding strip portions comprise a 1 st protruding strip portion and a 2 nd protruding strip portion extending to intersect with the 1 st protruding strip portion,

when a mold portion corresponding to an amount of 1 pitch of a tread pattern given to a tread contact surface of the tire is set as a mold minimum unit,

the method for manufacturing the tire molding die comprises the steps of the protrusion forming step, the groove forming step and the protrusion arranging step in this order,

in the projection forming step, at least a part of the 1 st projection and at least a part of the 2 nd projection of at least the minimum unit of the mold are integrally formed;

forming grooves for providing the integrally formed protruding strip portions in the main body portion of the embossed body segment in a groove forming step;

in the protruding portion setting step, the integrally formed protruding portion is inserted into the groove.

12. The method of manufacturing a mold for tire molding according to claim 11,

when the portions of the 1 st and 2 nd protrusions embedded in the main body of the tread pattern body are embedded portions and the portions exposed from the main body are exposed portions,

in the protrusion forming step, the protrusion is formed,

in a cross-sectional view of the tire forming mold in the width direction, all the embedded portions of the 1 st protrusion and the 2 nd protrusion are formed to extend in the same direction.

13. The method of manufacturing a mold for tire molding according to claim 12,

in the protrusion forming step, the protrusion is formed,

the thickness of the embedded part of the 1 st protrusion and/or the 2 nd protrusion is made thicker than at least a part of the 1 st protrusion and/or the 2 nd protrusion.

14. The manufacturing method of a mold for tire molding according to claim 12 or 13,

in the protrusion forming step, the protrusion is formed,

the 1 st projection and/or the 2 nd projection are connected by a connecting member provided between the embedded portion of the 1 st projection and/or the embedded portion of the 2 nd projection.

15. The method for manufacturing a tire molding die according to any one of claims 12 to 14, wherein,

in the groove-forming step,

the grooves formed in the main body of the embossed body section are formed to be wider than the thickness of the embedded part of the integrally formed ridge part, and

a vent hole is formed in the groove bottom of the groove to communicate the inner peripheral surface side and the outer peripheral surface side of the embossed body segment.

16. A tire, characterized in that,

the tire is manufactured by using the mold for tire molding according to any one of claims 6 to 10.

Technical Field

The present invention relates to a tire molding die, a method of manufacturing a tire molding die, and a tire.

Background

Conventionally, a tire is manufactured by vulcanizing and molding an unvulcanized green tire made of various rubber members and the like using a tire molding die. In a tire molding die, a tread-embossing surface for embossing a tread contact surface of a tire is provided with ribs, blades, and the like (ridges) for providing various grooves, sipes, and the like to the tread contact surface.

Generally, the bone, the blade, or the like provided on the tread-embossed surface of the tire molding die is provided by implanting the bone, the blade, or the like in a body portion previously molded by machining (for example, patent document 1), or by casting the bone, the blade, or the like while molding the body portion by casting (for example, patent document 2).

Disclosure of Invention

Problems to be solved by the invention

In recent years, in a trend of further improvement in tire performance, a tread pattern of a tire tends to be complicated. In order to mold a tire having a complicated tread pattern, a tire molding die having a tread surface corresponding to the complicated tread pattern is required, but such a die is difficult to manufacture and the strength of the die may be problematic.

Accordingly, an object of the present invention is to provide a tire molding die which can be easily manufactured and has improved strength.

Another object of the present invention is to provide a method for manufacturing a tire molding die, by which a tire molding die having improved strength can be easily obtained.

It is another object of the present invention to provide a tire that can be easily manufactured even with a complicated tread pattern.

Means for solving the problems

In claim 1, a tire molding die according to the present invention includes a tread embossing body including a plurality of embossing body segments arranged in a circumferential direction of the tire molding die, the tread embossing body embossing a tread contact surface of a tire, the embossing body segments including: a main body portion that molds an outer contour of a tread contact surface of the tire; and a plurality of protrusions extending from the main body portion in a radial direction of the tire molding die and providing a groove shape to a tread surface of the tire, the plurality of protrusions including a 1 st protrusion and a 2 nd protrusion extending so as to intersect with the 1 st protrusion, wherein the 1 st protrusion has a concave portion extending in the radial direction of the tire molding die on a side surface of the 1 st protrusion, the 2 nd protrusion has a connecting portion having a shape to be fitted into the concave portion at an end portion of the 2 nd protrusion, and the connecting portion is fitted into the concave portion.

In the present specification, "fitting" means a state in which the inner contour shape of the concave shape of the 1 st ridge coincides with the outer contour shape of the connecting portion of the 2 nd ridge, and the concave portion is completely filled with the connecting portion.

The tire of the present invention is characterized in that the tire is manufactured by using the tire molding mold according to claim 1.

In claim 2, a tire molding die according to the present invention includes a tread embossing body including a plurality of embossing body segments arranged in a circumferential direction of the tire molding die, the tread embossing body embossing a tread contact surface of a tire, the embossing body segments including: a main body portion that molds an outer contour of a tread contact surface of the tire; and a plurality of protrusions extending from the main body portion in a radial direction of the tire forming mold and providing a groove shape to a tread contact surface of the tire, the plurality of protrusions including a 1 st protrusion and a 2 nd protrusion extending so as to intersect with the 1 st protrusion, wherein when a mold portion corresponding to an amount of a 1 pitch of a tread pattern provided to the tread contact surface of the tire is set as a mold minimum unit, at least a part of the 1 st protrusion and at least a part of the 2 nd protrusion of the mold minimum unit are integrally formed.

The method for manufacturing a tire molding die according to the present invention is a method for manufacturing a tire molding die including a tread embossing body configured by a plurality of embossing body segments arranged in a circumferential direction of the tire molding die, the tread embossing body embossing a tread contact surface of a tire, the embossing body segments including: a main body portion that molds an outer contour of a tread contact surface of the tire; and a plurality of protrusions extending from the main body portion in a radial direction of the tire forming mold and providing a groove shape to a tread contact surface of the tire, the plurality of protrusions including a 1 st protrusion and a 2 nd protrusion extending so as to intersect with the 1 st protrusion, wherein the method for manufacturing the tire forming mold includes a protrusion forming step, a groove forming step, and a protrusion providing step in which at least a part of the 1 st protrusion and at least a part of the 2 nd protrusion in at least the minimum unit of the mold are integrally formed, when a mold portion corresponding to an amount of 1 pitch of a tread pattern provided to the tread contact surface of the tire is set as a minimum unit of the mold; forming grooves for providing the integrally formed protruding strip portions in the main body portion of the embossed body segment in a groove forming step; in the protruding portion setting step, the integrally formed protruding portion is inserted into the groove.

The tire of the present invention is characterized in that the tire is manufactured by using the tire molding mold according to claim 2.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, it is possible to provide a tire molding die which can be easily manufactured and has improved strength.

Further, according to the present invention, it is possible to provide a method for manufacturing a tire molding die, by which a tire molding die having improved strength can be easily obtained.

Further, according to the present invention, it is possible to provide a tire which can be easily manufactured even with a complicated tread pattern.

Drawings

Fig. 1 is a schematic view schematically showing the entire tire molding die according to an embodiment of the present invention.

Fig. 2 is a perspective view showing an embossed body segment of a tire molding die according to an embodiment of the present invention.

Fig. 3A is a side view of the 1 st ridge of the embossed body segment shown in fig. 2.

Fig. 3B is a sectional view taken along line a-a of fig. 3A.

Fig. 3C is a sectional view taken along line B-B of fig. 3A.

Fig. 4A is a front view of the 2 nd ridge of the embossed body segment shown in fig. 2.

Fig. 4B is a side view of the 2 nd ridge of the embossed body segment shown in fig. 2.

Fig. 4C is a sectional view taken along line C-C of fig. 4A.

Fig. 5 is a sectional view taken along line D-D of fig. 2.

Fig. 6 is a view showing a modification of the 1 st ridge of the embossed body segment shown in fig. 1.

Fig. 7 is a perspective view showing an embossed body segment of a tire molding die according to another embodiment of the present invention.

Fig. 8A is a side view of the 1 st ridge of the embossed body segment shown in fig. 7.

Fig. 8B is a sectional view taken along line E-E of fig. 8A.

Fig. 8C is a sectional view taken along line F-F of fig. 8A.

FIG. 9A is a front view of the 2 nd ridge of the embossed body segment shown in FIG. 7.

Fig. 9B is a side view of the 2 nd ridge of the embossed body segment shown in fig. 7.

Fig. 9C is a sectional view taken along line G-G of fig. 9A.

FIG. 10 is a view showing a modification of the 2 nd ridge of the embossed section shown in FIG. 7.

Fig. 11 is a view showing a modification of the 1 st ridge of the embossed body segment shown in fig. 7.

Fig. 12 is a perspective view showing an embossed body segment of a tire molding die according to still another embodiment of the present invention.

Fig. 13A is a side view of the 1 st ridge of the embossed body segment shown in fig. 12.

Fig. 13B is a sectional view taken along line H-H of fig. 13A.

Fig. 13C is a sectional view taken along line I-I of fig. 13A.

FIG. 14A is a front view of the 2 nd ridge of the embossed body segment shown in FIG. 12.

Fig. 14B is a side view of the 2 nd ridge of the embossed body segment shown in fig. 12.

Fig. 14C is a sectional view taken along line J-J of fig. 14A.

Fig. 15 is a sectional view taken along line K-K of fig. 12.

Fig. 16 is a view showing a modification of the 1 st ridge of the embossed body segment shown in fig. 12.

Fig. 17 is a perspective view showing an embossed body segment of a tire molding die according to still another embodiment of the present invention.

Fig. 18A is a front view of the 1 st ridge of the embossed body segment shown in fig. 17.

Fig. 18B is a sectional view taken along line L-L of fig. 18A.

Fig. 18C is a sectional view taken along line M-M of fig. 18A.

Fig. 19A is a front view of the 2 nd ridge of the embossed body segment shown in fig. 17.

Fig. 19B is a side view of the 2 nd ridge of the embossed body segment shown in fig. 17.

Fig. 19C is a sectional view taken along the line N-N of fig. 19A.

Fig. 20 is a view showing a modification of the 1 st ridge of the embossed body segment shown in fig. 17.

Fig. 21 is a perspective view showing an embossed body segment of a tire molding die according to still another embodiment of the present invention.

FIG. 22 is a perspective view of the raised strip portion of the embossed section shown in FIG. 21.

Fig. 23A is a sectional view taken along the line O-O of fig. 21.

Fig. 23B is a sectional view taken along line P-P of fig. 21.

FIG. 24 is a top view of the main body portion of the embossed body segment shown in FIG. 21.

FIG. 25 is a modification of the ridges of the embossed section shown in FIG. 21.

FIG. 26A is yet another variation of the ridges of the embossed section shown in FIG. 21.

FIG. 26B is yet another variation of the ridges of the embossed section shown in FIG. 21.

FIG. 26C is yet another variation of the ridges of the embossed section shown in FIG. 21.

FIG. 26D is still another variation of the ridges of the embossed section shown in FIG. 21.

FIG. 26E shows yet another variation of the ridges of the embossed section shown in FIG. 21.

FIG. 26F is yet another variation of the ridges of the embossed section shown in FIG. 21.

Fig. 27 is a perspective view showing an embossed body segment of a tire molding die according to still another embodiment of the present invention.

FIG. 28 is a perspective view of the raised strip portion of the embossed section shown in FIG. 26.

FIG. 29 is a top view of the main body portion of the embossed body segment shown in FIG. 26.

Fig. 30 is a perspective view showing an embossed body segment of a tire molding die according to still another embodiment of the present invention.

FIG. 31 is a perspective view of a raised strip of the embossed body segment shown in FIG. 29.

FIG. 32 is a top view of the main body portion of the embossed body segment shown in FIG. 29.

Fig. 33 is a perspective view showing a segment of an embossed body of a conventional tire molding die.

Fig. 34A is an enlarged explanatory view illustrating a part of the embossed body segment of fig. 32.

Fig. 34B is an enlarged explanatory view illustrating a part of the embossed body segment of fig. 32.

Detailed Description

Hereinafter, embodiments of the tire according to the present invention will be described by way of example with reference to the drawings. The same reference numerals are given to the members and portions common to the drawings.

< mold for tire Molding 1 >

Fig. 1 is a schematic view schematically showing an entire tire molding die (hereinafter, also simply referred to as "die") 100 according to an embodiment of the present invention. The mold 100 includes a circumferential holder 101 forming an outer contour of the mold 100, and a circumferential tread pattern 102 arranged on an inner circumferential side of the holder 101 and held by the holder 101. The tread emboss body 102 is a member for embossing a tread contact surface of a tire to impart a tread pattern to the tread contact surface, and a plurality of protrusions (not shown) corresponding to the tread pattern are provided on an inner peripheral surface of the tread emboss body 102. In this embodiment, the holder 101 is constituted by a plurality of (7 in the example of fig. 1) holder segments 101P divided in the circumferential direction of the mold 100 (hereinafter also simply referred to as "mold circumferential direction"). Also in this embodiment, the tread embossed body 102 is constituted by a plurality of (28 in the example of fig. 1) embossed body segments 102P divided in the mold circumferential direction. In the example of fig. 1, 4 embossed body segments 102P are held on 1 holder segment 101P.

The mold of the present invention is not limited to the embodiment shown in fig. 1, and the number of the holder segments and the embossed body segments and the number of the embossed body segments held by 1 holder segment may be appropriately changed according to the tread pattern of the tire to be molded.

In the schematic diagram of fig. 1, the mold circumferential end edges of the holder segments 101P and the embossed body segments 102P extend linearly along the width direction of the mold 100 (hereinafter also simply referred to as the "mold width direction"), but these mold circumferential end edges may extend in an irregular shape such as a zigzag shape or a wavy shape while being inclined with respect to the mold width direction in accordance with the tread pattern of the tire.

Fig. 2 is a perspective view showing an embossed body segment 102P of a tire molding die 100 according to an embodiment of the present invention. The embossed segment 102P has a main body 10 for molding the outer contour of the tread contact surface of the tire, and a plurality of ridges 11 extending from the main body 10 in the radial direction of the mold 100 (hereinafter also simply referred to as "mold radial direction") and giving the tread contact surface of the tire a groove shape. The protrusions 11 include a 1 st protrusion 12 and a 2 nd protrusion 13 extending so as to intersect with the 1 st protrusion 12.

More specifically, the projection portion 11 of the present embodiment includes: 4 first protrusions 12 extending in the circumferential direction of the mold; and a plurality of 2 nd protrusions 13 connecting the 1 st protrusions 12 extending on both outer sides in the die width direction and the 1 st protrusions 12 extending adjacent to the 1 st protrusions 12 in the die width direction, respectively, the plurality of 2 nd protrusions 13 extending along the die width direction. In this example, the 2 nd projection 13 intersects the 1 st projection 12 at a substantially right angle, and the end of the 2 nd projection 13 is inserted into the side surface of the 1 st projection 12 and fitted thereto. The shape of the fitting portion between the side surface of the 1 st projection 12 and the end of the 2 nd projection 13 will be described below. The embossed body segment 102 of this embodiment is manufactured by disposing (implanting) the protruding strip portions 11 in the main body portion 10 that is formed in advance by machining or the like.

Fig. 3A is a side view (a view seen from the mold width direction) of the 1 st protruding portion 12, fig. 3B is a sectional view taken along the line a-a of fig. 3A, and fig. 3C is a sectional view taken along the line B-B of fig. 3A. Here, the state before the 1 st protruding portion 12 is disposed on the main body portion 10 is shown.

As shown in fig. 3A, the 1 st protrusions 12 have recesses 12R extending in the mold radial direction on the side surfaces of the 1 st protrusions 12, that is, on the surfaces along the extending direction of the 1 st protrusions 12 (the surfaces perpendicular to the thickness direction of the 1 st protrusions 12). The number of the concave portions 12R provided on the 1 st projection 12 is equal to the number of the 2 nd projections 13 intersecting the 1 st projection 12.

In the concave portion 12R of the present embodiment, in the side view of the 1 st ridge 12, the mold radial direction outside portion of the concave portion 12R is formed by the narrow width portion N12R having a constant width, and the mold radial direction inside portion of the concave portion 12R is formed by the wide width portion W12R (in this example, a deformed pentagonal shape) having a width wider than the width of the narrow width portion N12R.

Further, since the recessed portion 12R is formed in accordance with the end surface shape of the connecting portion 13C of the 2 nd protruding portion 13 described later, the shape of the recessed portion 12R can be appropriately changed in accordance with the end surface shape of the connecting portion 13C of the 2 nd protruding portion 13.

Further, as shown in fig. 3B, the 1 st protruding portion 12 of this embodiment has a flask-like cross-sectional shape having a thick portion TP12 on the inner side in the mold radial direction. More specifically, the 1 st projection 12 has a radially outer mold portion formed by a thin wall NP12 of a constant width and a radially inner mold portion formed by a locally raised thick wall TP12 of the 1 st projection 12.

As shown in fig. 3C, the depth (length in the thickness direction of the 1 st protrusion 12) of the concave portion 12R of this embodiment is less than half the thickness of the 1 st protrusion 12. The strength of the 1 st protrusion 12 can be improved by making the depth of the concave portion 12R smaller than half the thickness of the 1 st protrusion 12.

In this example, the plurality of concave portions 12R are formed on one side surface of the 1 st ridge 12, but in another example, a plurality of concave portions may be formed on both side surfaces of the 1 st ridge.

Fig. 4A is a front view (view seen from the mold circumferential direction) of the 2 nd projection 13, fig. 4B is a side view (view seen from the mold width direction) of the 2 nd projection 13, and fig. 4C is a cross-sectional view of a plane along the line C-C of fig. 4A. Here, the 2 nd protrusion 13 is shown in a state before being disposed on the main body 10.

As shown in fig. 4A and 4B, the 2 nd protrusion 13 has a connecting portion 13C (the boundary of the connecting portion 13 is shown by a broken line in the figure) at an end portion (both end portions in the embodiment) of the 2 nd protrusion 13, and the connecting portion 13C has a shape to be fitted into the concave portion 12R provided on the side surface of the 1 st protrusion 12.

That is, the shape of the end face of the connecting portion 13C of the 2 nd projection 13 (see fig. 4B) matches the shape of the face of the recess 12R of the 1 st projection 12 that contacts the end face of the 2 nd projection 13 (in this example, the face along the mold circumferential direction) (see fig. 3A), and the shape of the face of the connecting portion 13C of the 2 nd projection 13 that is orthogonal to the end face (see fig. 4A) matches the shape of the face of the recess 12R of the 1 st projection 12 that is orthogonal to the face of the first projection that contacts the end face of the 1 st projection (in this example, the face along the mold width direction) (see fig. 3C). The volume of the connecting portion 13C of the 2 nd projection 13 is equal to the volume of the recess 12R of the 1 st projection 12.

As shown in fig. 4C, the center portion of the 2 nd protruding portion 13 of this embodiment has a flask-like cross-sectional shape having a thick portion TP13 on the inner side in the mold radial direction. The 2 nd projection 13 has a mold radial direction outer portion formed by a thin portion NP13 having a constant width, and a mold radial direction inner portion formed by a thick portion TP13 which is partially raised, of the 2 nd projection 13.

As described above, in the 2 nd projection 13 of the present embodiment, the central portion CR13 and the end portion ER13 are continuously formed integrally, although the shapes of the connecting portion 13C provided at the central portion of the 2 nd projection 13 and the end portion of the 2 nd projection 13 are different from each other.

In this embossed section 102P, the 2 nd protrusion 12 and the 2 nd protrusion 13 are connected by fitting the connecting portion 13C provided at the end of the 2 nd protrusion 13 into the concave portion 12R provided on the side surface of the 1 st protrusion 12.

Fig. 5 is a sectional view taken along the plane D-D of fig. 2. In this embossed body segment 102P, after the 1 st projection 12 is disposed on the main body portion 10 of the embossed body segment 102P, the 2 nd projection 13 is inserted into the 1 st projection 12 from the inside toward the outside in the mold radial direction via the recess 12R provided on the side surface of the 1 st projection 12, whereby the 1 st projection 12 and the 2 nd projection are disposed in a connected state. As shown in fig. 5, the connecting portion 13C of the 2 nd projection is fitted in the concave portion 12R of the 1 st projection 12, and the concave portion 12R is completely filled with the connecting portion 13C.

In this configuration, since the shape of the concave portion 12R formed on the side surface of the 1 st ridge 12 completely matches the shape of the convex portion 13C formed at the end of the 2 nd ridge 13, the 1 st ridge 12 and the 2 nd ridge 13 can be connected and fixed to each other only by inserting the convex portion 13C into the concave portion 12R. Therefore, in the mold 100 of this embodiment, the mold can be easily manufactured as compared with the conventional one, and the strength of the mold can be improved.

Fig. 32 is a perspective view showing an embossed segment 902P of a conventional tire molding die 900. The embossed body segment 902P is manufactured by implanting a plurality of protrusions 91 in the main body portion 90 which is formed in advance by machining, similarly to the embossed body segment 102P according to the above-described embodiment of the present invention, and the plurality of protrusions 91 include the 1 st protrusion 92 and the 2 nd protrusion 93 which extends so as to intersect with the 1 st protrusion 92. In the conventional embossed segment 902P, a recessed portion 92R extending in the mold radial direction is provided on the side surface of the 1 st ridge 92, and the end portion of the 2 nd ridge 93 is inserted into the recessed portion 92R, whereby the 1 st ridge 92 and the 2 nd ridge 93 are connected.

However, in the conventional embossed section 902P, the end of the 2 nd ridge 93 is not provided with a shape to be fitted into the concave portion 92R. Therefore, a void V (see fig. 33A) corresponding to a difference between the volume of the recess 92R and the volume of the end of the 2 nd ridge 93 inserted into the recess 92R is generated in the recess 92R of the 1 st ridge 92, and the void V is filled by, for example, overlay welding or the like (see "welded portion W" in fig. 33B). The filled welding portion W is trimmed to the contour shape of the 1 st projection by sandblasting or the like, thereby forming the projection 91.

As described above, in the conventional embossed segment 902P, after the 1 st projection 92 and the 2 nd projection 93 are arranged, welding for filling the gap V at the intersection of the 1 st projection 92 and the 2 nd projection 93 and blasting for shaping the shape of the welded portion are required.

On the other hand, in the embossed body segment 102P according to the embodiment of the present invention, as described above, the connecting portion 13C having a shape to be fitted into the concave portion 12R provided on the side surface of the 1 st ridge 12 is provided at the end portion of the 2 nd ridge 13, and the connecting portion 13C is fitted into the concave portion 12R of the 1 st ridge 12, and the concave portion 12R is completely filled up, so that the ridge 11 can be formed without performing welding or blast processing as in the conventional art.

Therefore, in the mold of this embodiment, the mold can be easily manufactured as compared with the conventional one, and the strength of the mold can be improved.

In the above-described embodiment, the 1 st ridge 12 is a ridge member for providing a circumferential groove on the tread contact surface of the tire, and the 2 nd ridge 13 is a blade member for providing a sipe intersecting the circumferential groove, but in the mold of the present invention, the 1 st ridge and the 2 nd ridge may be any member such as a ridge member for providing a circumferential groove and/or a widthwise groove on the tread contact surface of the tire, or a blade member for providing a sipe on the tread contact surface of the tire.

The configuration of the above embodiment is particularly advantageous in the case where the height H12 of the 1 st protrusion 12 and the height H13 of the 2 nd protrusion 13 are different as in the present embodiment (that is, in the case where the groove depths of the grooves provided in the tread contact surface of the tire by the 1 st protrusion 12 and the 2 nd protrusion are different). This is because, in general, when the heights of the intersecting protruding portions are different, the intersecting portions need to be processed (e.g., by overlay welding or blast treatment).

The configuration of the above-described embodiment is particularly advantageous in the case where the 1 st protrusion 12 and/or the 2 nd protrusion 13 (both in the present embodiment) have thick portions TP12 and TP13 (see fig. 3B and 4C) having a larger wall thickness on the inner side in the mold radial direction of the protrusion than on the outer side in the mold radial direction of the protrusion (that is, in the case where the groove width of the groove provided to the tread contact surface of the tire by the protrusion is larger on the groove bottom side than on the tread contact surface side) as in the present embodiment. This is because, in general, when such protruding portions are provided, it is necessary to perform processing (overlay welding, blast processing, or the like) on the intersection portions of the protruding portions.

In the present embodiment, the average thickness of the 1 st protrusions 12 (the average value of the thicknesses measured in the direction orthogonal to the extending direction of the 1 st protrusions) is larger than the average thickness of the 2 nd protrusions 13 (the average value of the thicknesses measured in the direction orthogonal to the extending direction of the 2 nd protrusions), but in the mold of the present invention, the average thickness of the 1 st protrusions can be made smaller than the average thickness of the 2 nd protrusions.

Fig. 6 shows a modification of the 1 st projection 12. That is, the side view of the 1 st ridge 12' composed of the ridge units 12P divided in the mold circumferential direction is shown. As described above, the 1 st ridge is preferably constituted by the ridge modules 12P divided in the extending direction of the 1 st ridge (in this example, the mold circumferential direction), and each ridge module 12P is preferably arranged so that a predetermined space is provided between the adjacent surfaces of the adjacent ridge modules 12P.

In the case of manufacturing a mold by a casting method (in the case of manufacturing a bar assembly by over-casting), since the thermal expansion amount of the bar assembly is large, in the case of using a single member continuously extending over a relatively long span, the member is easily deformed by thermal expansion. In this case, a desired tread pattern may not be obtained. Here, if the 1 st ridge is formed by the ridge assemblies 12P divided in the mold circumferential direction and the ridge assemblies 12P adjacent to each other are arranged with a predetermined space provided between the adjacent surfaces, it is easy to avoid the occurrence of strain or the like of the 1 st ridge due to thermal expansion of the ridge assemblies 12P during casting and encapsulation (this is a phenomenon that occurs even during heating during vulcanization of the tire).

As shown in fig. 6, the ridge module 12P is preferably divided at a recessed portion 12R provided on the side surface of the 1 st ridge 12' (e.g., the center of the recessed portion 12R).

In the above example, the 1 st protrusion 12 is constituted by the protrusion assemblies 12P divided in the extending direction of the 1 st protrusion 12, but in the mold of the present invention, in the case where the 2 nd protrusion is a single member continuously extending over a relatively long span range, the 2 nd protrusion may be constituted by the protrusion assemblies divided in the extending direction of the 2 nd protrusion.

The embossed segment 102P of the mold 100 according to the embodiment of the present invention has been described above, but the arrangement of the ridges of the mold according to the present invention is not limited to the embodiment shown in fig. 2, and can be appropriately changed according to the tread pattern given to the tread contact surface of the tire.

< mold for tire Molding 2 >

Next, fig. 7 is a perspective view showing an embossed body segment 202P of a tire molding die 200 according to another embodiment of the present invention. The same structure of the embossed body segment 202P as that of the embossed body segment 102P shown in fig. 2 will not be described.

The embossed segment 202P has a main body 20 for molding the outer contour of the tread contact surface of the tire, and a plurality of protrusions 21 extending from the main body 20 in the mold radial direction and giving a groove shape to the tread contact surface of the tire, and the protrusions 21 include a 1 st protrusion 22 and a 2 nd protrusion 23 extending so as to intersect with the 1 st protrusion 22. The embossed body segment 202P is different from the embossed body segment 102P in the shape of the concave portion 22R provided on the side surface of the 1 st ridge 22 and the shape of the 2 nd ridge 23.

Fig. 8A is a side view (a view seen from the circumferential direction of the mold) of the 1 st protruding portion 22, fig. 8B is a sectional view taken along line E-E of fig. 8A, and fig. 8C is a sectional view taken along line F-F of fig. 8A. Here, the state in which the 1 st protruding portion 22 is disposed before the main body portion 20 is shown.

As shown in fig. 8A, the 1 st protrusions 22 have recesses 22R extending in the mold radial direction on the side surfaces of the 1 st protrusions 22, that is, on the surfaces along the extending direction of the 1 st protrusions 22 (the surfaces perpendicular to the thickness direction of the 1 st protrusions 22). The number of the concave portions 22R provided on the 1 st projection 22 is equal to the number of the 2 nd projections 23 intersecting with the 1 st projection 22.

The concave portion 22R of this embodiment has a rectangular shape elongated in the mold radial direction in the side view of the 1 st protruding portion 22.

Fig. 9A is a front view (view seen from the mold circumferential direction) of the 2 nd projection 23, fig. 9B is a side view (view seen from the mold width direction) of the 2 nd projection 23, and fig. 9C is a cross-sectional view of a plane along the line G-G of fig. 9A. Here, the 2 nd protrusion 23 is shown in a state before being disposed on the main body portion 20.

As shown in fig. 9A and 9B, the 2 nd ridge 23 has connecting portions 23C at the end portions (both end portions in the present embodiment) of the 2 nd ridge 23, and the connecting portions 23C have a shape that fits in the concave portions 22R provided on the side surfaces of the 1 st ridge 22.

That is, the end face of the connecting portion 23C of the 2 nd protrusion 23 has a rectangular shape elongated in the mold radial direction (see fig. 9B), and matches the shape of the surface (in this example, the surface along the mold circumferential direction) of the recessed portion 22R provided on the side face of the 1 st protrusion 22, which surface contacts the end face of the 2 nd protrusion 23 (see fig. 8A), and the shape of the surface (see fig. 9A) of the connecting portion 23C of the 2 nd protrusion 23, which surface is orthogonal to the end face, matches the shape (in this example, the surface along the mold width direction) of the recessed portion 22R of the 1 st protrusion 22, which surface is orthogonal to the surface (in this example, the surface along the mold width direction). The volume of the connecting portion 23C of the 2 nd projection 23 is equal to the volume of the recess 22R of the 1 st projection 22.

As shown in fig. 9C, the center portion of the 2 nd protrusion 23 of the present embodiment is formed by a thin portion NP23 having a constant width on the outside in the mold radial direction of the 2 nd protrusion 23, the center portion in the mold radial direction of the 2 nd protrusion 23 is formed by a bent portion BP23 extending in a zigzag shape on one side and the other side of a plane (not shown) passing through the center in the thickness direction of the 2 nd protrusion 23, and the inside portion in the mold radial direction of the 2 nd protrusion 23 is formed by a thick portion TP23 which partially bulges.

By extending the parts of the 2 nd protrusion 23 in a zigzag manner on one side and the other side of a plane (not shown) passing through the center in the thickness direction of the 2 nd protrusion 23, for example, it is possible to form a groove or a sipe extending in a zigzag manner in the groove depth direction on the tread contact surface of the tire.

In the 2 nd protruding portion 23 of the present embodiment, the shape of the connecting portion 23C provided at the end portion of the 2 nd protruding portion 23 is different from that of the central portion of the 2 nd protruding portion 23, but the central portion and the end portion are continuously formed integrally.

In this embossed body segment 202 as well, the 1 st protrusion 22 and the 2 nd protrusion 23 are connected by fitting the connecting portion 23C provided at the end of the 2 nd protrusion 23 into the concave portion 22R provided on the side surface of the 1 st protrusion 22.

In this configuration, since the shape of the concave portion 22R formed on the side surface of the 1 st ridge 22 and the shape of the convex portion 23C formed at the end portion of the 2 nd ridge 23 completely match each other, the 1 st ridge 22 and the 2 nd ridge 23 can be connected and fixed to each other only by inserting the convex portion 23C into the concave portion 22R. Therefore, also in the mold 200 of this embodiment, the mold can be easily manufactured as compared with the conventional one, and the strength of the mold can be improved.

In the embossed segment 200, the end surface of the end portion of the 2 nd protruding strip portion 23 having the bent portion BP23 extending in a zigzag manner is formed in an elongated rectangular shape instead of a zigzag shape (see fig. 9B), and further, the end portion of the 2 nd protruding strip portion 23 is formed in a rectangular parallelepiped shape, so that the 2 nd protruding strip portion 23 can be easily inserted into the recessed portion 22R provided on the side surface of the 2 nd protruding strip portion 22.

Fig. 10 is a perspective view showing a modification of the 2 nd projection 23. The 2 nd ridge 23 ' has a projection P extending in a direction intersecting with the mold radial direction (in the mold circumferential direction in this embodiment) formed at the connecting portion 23C ' of the 2 nd ridge 23 '. In addition, although not shown, a projection receiving portion corresponding to the projection P is provided in the recess 22C of the 1 st projection 22. According to this structure, since the 2 nd protrusions 23' are more firmly connected to the 1 st protrusions 22, the strength of the mold can be further improved.

The projection P may be, for example, a direction orthogonal to the extending direction of the 2 nd protrusions 23 ', a direction along the extending direction of the 2 nd protrusions 23', or the like, as long as the projection P is in a direction intersecting the mold radial direction. The projection P can be provided at any position as long as it is the connecting portion 23C 'of the 2 nd projection 23', but if it is provided on the die radial direction inner side of the connecting portion 23 ', the insertion of the 2 nd projection 23' into the 1 st projection 22 becomes easy.

The structure of the protrusions P shown in fig. 10 can be provided in the same manner in the embossed body segment 102P of the previous embodiment and the embossed body segments 302P and 402P described later.

Fig. 11 shows a modification of the 1 st projection 22. That is, the side view of the 1 st ridge 22' composed of the ridge units 22P divided in the mold circumferential direction is shown. For the same reason as described above with respect to the mold 100, the 1 st ridge is preferably constituted by the ridge assemblies 22P divided in the mold circumferential direction, and more preferably, each ridge assembly 22P is disposed so as to provide a predetermined space between the adjacent surfaces of the adjacent ridge assemblies 22P. This is because it is easy to avoid the occurrence of strain in the 1 st ridge due to thermal expansion of the ridge assembly 22P during casting of the mold.

It is preferable that the ridge module 22P is divided at a position of the concave portion 22R provided on the side surface of the 1 st ridge 22' (for example, a center position of the concave portion 22R) as in the ridge module 22P shown in fig. 11.

< mold for tire Molding 3 >

Fig. 12 is a perspective view showing an embossed body segment 302P of a tire molding die 300 according to another embodiment of the present invention. The same structure of the embossed body segment 302P as the embossed body segment 102P shown in fig. 2 and/or the embossed body segment 202P shown in fig. 7 will not be described.

The embossed segment 302P has a main body 30 for molding the outer contour of the tread surface of the tire, and a plurality of protrusions 31 extending from the main body 30 in the mold radial direction and giving a groove shape to the tread surface of the tire, and the protrusions 31 include a 1 st protrusion 32 and a 2 nd protrusion 33 extending so as to intersect with the 1 st protrusion 32. The embossed body segment 302P is different from the embossed body segments 102P and 202P in the shape of the concave portion 32R of the 1 st ridge 32 and the shape of the 2 nd ridge 33. The embossed body segment 302P is also different from the embossed body segments 102P and 202P described above in that the main body portion 30 is molded by casting (cast plaster method in this example) and the ridge portion 31 is manufactured by ladle casting.

Fig. 13A is a front view (view viewed from the circumferential direction of the mold) of the 1 st protruding portion 32, fig. 13B is a sectional view taken along the line H-H in fig. 13A, and fig. 13C is a sectional view taken along the line I-I in fig. 13A. Here, the 1 st protruding portion 32 is shown in a state before being cast around the main body portion 30.

As shown in fig. 13A, the 1 st protrusions 32 have recesses 32R extending in the mold radial direction on the side surfaces of the 1 st protrusions 32, that is, on the surfaces along the extending direction of the 1 st protrusions 32 (the surfaces perpendicular to the thickness direction of the 1 st protrusions 32). The number of the concave portions 32R provided in the 1 st projection 32 is equal to the number of the 2 nd projection 33 intersecting the 1 st projection 32.

In the concave portion 32R of this embodiment, in the side view of the 1 st protruding portion 32, the mold radial direction outside portion is formed by the narrow width portion N32R having a constant width, and the mold radial direction inside portion of the concave portion 32R is formed by the wide width portion W32R (in this example, a droplet shape) having a width wider than the width of the narrow width portion N32R.

Fig. 14A is a front view (view seen from the mold circumferential direction) of the 2 nd projection 33, fig. 14B is a side view (view seen from the mold width direction) of the 2 nd projection 33, and fig. 14C is a cross-sectional view of a plane along the J-J line of fig. 14A. Here, the 2 nd protrusion 33 is shown in a state before being disposed on the main body 30.

As shown in fig. 14A and 14B, the 2 nd protruding portion 33 has a connecting portion 33C at an end portion (both end portions in the present embodiment) of the 2 nd protruding portion 33, and the connecting portion 33C has a shape to be fitted into the concave portion 32R provided on the side surface of the 1 st protruding portion 32.

That is, the shape of the end face of the connecting portion 33C of the 2 nd protrusion 33 (see fig. 14B) matches the shape of the surface of the recessed portion 32R of the 1 st protrusion 32 that contacts the end face of the 2 nd protrusion 33 (in this example, the surface along the mold circumferential direction) (see fig. 13A), and the shape of the surface of the connecting portion 33C of the 2 nd protrusion 33 that is orthogonal to the end face (see fig. 14A) matches the shape of the surface of the recessed portion 32R of the 1 st protrusion 32 that is orthogonal to the surface that contacts the end face of the 1 st protrusion 31 (in this example, the surface along the mold width direction) (see fig. 13C). The volume of the connecting portion 33C of the 2 nd protrusion 33 is equal to the volume of the recess 32R of the 1 st protrusion 32.

In this embossed section 302P, the 2 nd protrusions 32 and the 2 nd protrusions 33 are connected by fitting the connecting portions 33C provided at the end portions of the 2 nd protrusions 33 into the recessed portions 32R provided on the side surfaces of the 1 st protrusions 32.

Fig. 15 is a cross-sectional view taken along the line K-K in fig. 12. As shown in fig. 15, the connecting portion 33C of the 2 nd projection is fitted in the concave portion 32R of the 1 st projection 32, and the concave portion 32R is completely filled with the connecting portion 33C.

In this configuration, since the shape of the concave portion 32R formed on the side surface of the 1 st ridge 32 completely matches the shape of the convex portion 33C formed at the end portion of the 2 nd ridge 33, and the 1 st ridge 32 and the 2 nd ridge 33 are coupled to each other by this fitting, the mold can be easily manufactured, and the strength of the mold can be improved.

Although not shown, in the conventional case of manufacturing the embossed body segment by the cast plaster method, the 1 st and 2 nd protrusions are merely positioned with respect to each other and then fixed to each other by filling molten metal of an alloy such as an aluminum alloy forming the main body portion of the embossed body segment and solidifying the molten metal. That is, the 1 st projection and the 2 nd projection are merely aligned with each other, and do not have any fitting structure or engagement structure. According to the gypsum casting method, the mold can be easily manufactured as compared with a manufacturing method in which the main body portion of the embossed body segment is molded and then the ridge portions are arranged (post-implanted) in the main body portion, but on the other hand, there is a case where the strength of the mold is problematic.

In the embossed body segment 302P of this embodiment, since the 1 st ridge 32 and the 2 nd ridge 33 are fitted to each other, the strength of the mold manufactured by casting can be improved without changing the ease of manufacturing the mold.

In the embossed body segment 302 produced by casting, unlike the embossed body segments 102 and 202 described above, since the intersecting protrusions can be connected in advance without inserting the 2 nd protrusion 33 from the die radial direction inside of the 1 st protrusion 32, the shape of the concave portion 32R of the 1 st protrusion 32 and the shape of the connecting portion 33C of the 2 nd protrusion 33 can be minimized. Thus, the manufacture of the mold becomes easier.

Fig. 16 shows a modification of the 1 st protruding portion 32. That is, the side view of the 1 st ridge 32' composed of the ridge units 32P divided in the mold circumferential direction is shown. For the same reason as described with respect to the above-described molds 100 and 200, the 1 st ridge is preferably constituted by ridge modules 32P divided in the mold circumferential direction, and more preferably, each ridge module 32P is disposed so as to provide a predetermined space between adjacent surfaces of adjacent ridge modules 32P. This is because it is easy to avoid the occurrence of strain or the like in the 1 st ridge due to thermal expansion of the ridge assembly 22P during die casting.

It is preferable that the ridge module 32P is divided at the position of the concave portion 32R provided on the side surface of the 1 st ridge 32' (for example, the center position of the concave portion 22R) as in the ridge module 32P shown in fig. 16.

< mold for tire Molding 4 >

Fig. 17 is a perspective view showing an embossed body segment 402P of a tire molding die 400 according to another embodiment of the present invention. In the embossed body segment 402P, the same configurations as those of the embossed body segments 102P, 202P, and 302P described above are omitted.

The embossed section 402P has a main body 40 for molding the outer contour of the tread surface of the tire, and a plurality of protrusions 41 extending from the main body 40 in the mold radial direction and giving a groove shape to the tread surface of the tire, and the protrusions 41 include a 1 st protrusion 42 and a 2 nd protrusion 43 extending so as to intersect with the 1 st protrusion 42. The embossed body segment 402P is different from the embossed body segments 102P, 202P, and 302P in the shape of the recessed portion 42R provided on the side surface of the 1 st ridge 42 and the shape of the 2 nd ridge 43.

Fig. 18A is a side view (a view seen from the mold circumferential direction) of the 1 st protruding portion 42, fig. 18B is a sectional view taken along the line L-L of fig. 18A, and fig. 8C is a sectional view taken along the line M-M of fig. 18A. Here, the state in which the 1 st protruding strip portion 42 is disposed before the main body portion 40 is shown.

As shown in fig. 18A, the 1 st protrusions 42 have recesses 42R extending in the mold radial direction on the side surfaces of the 1 st protrusions 42, that is, on the surfaces along the extending direction of the 1 st protrusions 42 (the surfaces perpendicular to the thickness direction of the 1 st protrusions 42). The number of the concave portions 42R provided in the 1 st projection 42 is equal to the number of the 2 nd projection 43 intersecting the 1 st projection 42.

In this example, the recessed portion 42R has a rectangular shape elongated in the mold radial direction in a side view of the 1 st ridge 42, but an end portion on the inner side in the mold radial direction is formed in an arch shape.

Fig. 19A is a front view (view seen from the mold circumferential direction) of the 2 nd protruding portion 43, fig. 19B is a side view (view seen from the mold width direction) of the 2 nd protruding portion 43, and fig. 19C is a cross-sectional view taken along the line N-N of fig. 19A. Here, the 2 nd protrusion 43 is shown in a state before being disposed on the main body portion 40.

As shown in fig. 19A and 19B, the 2 nd ridge 43 has connecting portions 43C at the end portions (both end portions in the present embodiment) of the 2 nd ridge 43, and the connecting portions 43C have a shape that fits in the concave portions 42R provided on the side surfaces of the 1 st ridge 42.

That is, the end face of the connecting portion 43C of the 2 nd projection 43 has a rectangular shape elongated in the mold radial direction (see fig. 19B), and matches the shape of the surface (in this example, the surface along the mold circumferential direction) of the recessed portion 42R provided on the side face of the 1 st projection 42 that contacts the end face of the 2 nd projection 43 (see fig. 18A), and the shape of the surface (see fig. 19A) of the connecting portion 43C of the 2 nd projection 43 that is orthogonal to the end face matches the shape (in this example, the surface along the mold width direction) of the recessed portion 42R of the 1 st projection 42 that is orthogonal to the surface (in this example, the surface along the mold width direction). The volume of the connecting portion 43C of the 2 nd protrusion 43 is equal to the volume of the recess 42R of the 1 st protrusion 42.

As shown in fig. 19C, in the center portion of the 2 nd protrusion 43 of the present embodiment, the mold radial direction outside portion of the 2 nd protrusion 43 is formed by the thin portion NP43 having a constant width, the mold radial direction center portion of the 2 nd protrusion 43 is formed by the bent portion BP43 extending in a zigzag shape on one side and the other side of the plane (not shown) passing through the thickness direction center of the 2 nd protrusion 43, and the mold radial direction inside portion of the 2 nd protrusion 43 is formed by the thick portion TP43 which is partially raised.

By extending the 2 nd protrusion 43 partially in a zigzag manner on one side and the other side of a plane (not shown) passing through the center in the thickness direction of the 2 nd protrusion 43, for example, in this manner, it is possible to form a groove or a sipe extending in a zigzag manner in the groove depth direction on the tread contact surface of the tire.

In the 2 nd protruding portion 43 of this embodiment, the shape of the connecting portion 43C provided at the end portion of the 2 nd protruding portion 43 is different from that of the central portion of the 2 nd protruding portion 43, but the central portion and the end portion are continuously formed integrally.

In this embossed body segment 402, similarly, the connecting portion 43C provided at the end of the 2 nd protrusion 43 is fitted into the concave portion 42R provided on the side surface of the 1 st protrusion 42, whereby the 1 st protrusion 42 and the 2 nd protrusion 43 are connected.

Fig. 20 shows a modification of the 1 st projection 42. That is, the side view of the 1 st ridge 42' composed of the ridge units 42P divided in the mold circumferential direction is shown. For the same reason as described above with respect to the molds 100, 200, and 300, the 1 st ridge is preferably formed by the ridge assemblies 42P divided in the mold circumferential direction, and more preferably, each ridge assembly 42P is disposed so as to provide a predetermined space between the adjacent surfaces of the adjacent ridge assemblies 42P. This is because it is easy to avoid the occurrence of strain or the like in the 1 st ridge due to thermal expansion of the ridge assembly 42P during die casting.

It is preferable that the ridge module 42P is divided at a position of the recessed portion 42R provided on the side surface of the 1 st ridge 42' (for example, a center position of the recessed portion 42R) as in the ridge module 42P shown in fig. 20.

< method for manufacturing tire Molding die 1 >

The embossed body segments 102P, 202P, 302P, and 402P of the molds 100, 200, 300, and 400 can be obtained by a manufacturing method including the steps of: a recess forming step of forming recesses 12R, 22R, 32R, 43R extending in the mold radial direction on the side surfaces of the 1 st protrusions 12, 22, 32, 42; a connecting portion forming step of forming connecting portions 13C, 23C, 33C, 43C having shapes to be fitted into the concave portions 12R, 22R, 32R, 42R at the end portions of the 2 nd protruding portions 13, 23, 33, 43; and a fitting step of fitting the connection portions 13C, 23C, 33C, and 43C into the concave portions 12R, 22R, 32R, and 43R. According to the method for manufacturing the mold, a tire molding mold having improved strength can be easily obtained.

In the above-described manufacturing method, it is preferable that the method further includes, before the fitting step: a protrusion forming step of providing protrusions P extending in a direction intersecting with a mold radial direction at the end portions of the 2 nd protrusion portions 13, 23, 33, 43; and a protrusion receiving portion forming step of providing protrusion receiving portions corresponding to the protrusions P in the recessed portions 12R, 22R, 32R, 42R of the 1 st protrusion portions 12, 22, 32, 42. According to the method for manufacturing a mold, a tire molding mold having further improved strength can be obtained.

Further, in the tire manufactured by using the above-described tire molding die 100, 200, 300, 400, the tire can be manufactured by using the die 100, 200, 300, 400 which can be manufactured by assembling each assembly of the 1 st protruding strip portion 12, 22, 32, 42 and the 2 nd protruding strip portion 13, 23, 33, 43 which form the embossed body segments 102P, 202P, 302P, 402P, and therefore, the tire can be easily manufactured even with a complicated tread pattern.

< mold for tire Molding 5 >

Fig. 21 is a perspective view showing an embossed body segment 502P of a tire molding die 500 as another embodiment of the present invention. The same structure of the embossed body segment 502P as that of the embossed body segments 102P to 402P described above will not be described.

The embossed segment 502P has a main body 50 for molding the outer contour of the tread contact surface of the tire, and a plurality of protrusions 51 extending from the main body 50 in the mold radial direction and giving a groove shape to the tread contact surface of the tire, and the protrusions 51 include a 1 st protrusion 52 and a 2 nd protrusion 53 extending so as to intersect with the 1 st protrusion 52. The embossed body segment 502P corresponds to a mold portion of the minimum unit of the mold corresponding to an amount of 1 pitch of the tread pattern given to the tread contact surface of the tire.

In the embossed body segment 502P of this embodiment, the inner peripheral surface of the main body portion 50 is subjected to electric discharge machining using the protruding portion 51 formed in advance by, for example, a laser stack molding method (powder direct molding method), assembly of a press-welding member, or the like, so that a groove (discharge slit) 50G (see fig. 24) into which the protruding portion 51 is inserted (implanted) is formed in the inner peripheral surface of the main body portion 50. Fig. 21 shows a state in which the projection 51 is inserted into the groove 50G.

Fig. 22 is a perspective view of the protrusions 51 of the embossed body segment 502P shown in fig. 21. The protrusions 51 of this embodiment are formed integrally with at least a part of the 1 st protrusion 52 and at least a part of the 2 nd protrusion 53, which are at least the minimum unit of the mold (in this embodiment, the minimum unit of the mold). In this embodiment, all the 1 st protrusions 52 and all the 2 nd protrusions 53 of the embossed body segment 502P are integrally formed.

According to this configuration, the embossed body segment 502P can be formed only by disposing the protruding portions 51 integrally formed in advance in the main body portion 50, and therefore, the mold can be easily manufactured. Further, since at least part of the 1 st protrusion 52 and at least part of the 2 nd protrusion 53 are integrally formed, the strength of the mold can be improved. Further, since the protruding strip portion 51 can be removed and attached from the main body portion 50 of the embossed body section 502P as a whole, cleaning of the mold is also facilitated.

The 1 st projection 52 and the 2 nd projection 53 of this embodiment also have a flask-like cross-sectional shape having a thick portion on the inner side in the mold radial direction. In this way, in the protruding portion 51 having the flask-like cross-sectional shape, the assembly of the intersecting portion of the 1 st protruding portion 52 and the 2 nd protruding portion 53 tends to be complicated, but in this embodiment, since the protruding portion 51 is integrally formed in advance, it is possible to easily manufacture a mold without complicated assembly work.

Fig. 23A is a sectional view taken along the line O-O of fig. 21. That is, fig. 23A shows a cross section of the 1 st protruding portion 52. As shown in the figure, the 1 st protruding portion 52 of this embodiment has an embedded portion 52a embedded in the main body portion 50 and an exposed portion 52b exposed from the main body portion 50, and the embedded portion 52a is disposed offset from the trench wall of the trench 50G. That is, in the embossed body section 502, the ventilation slit S1 is provided between the main body portion 50 of the embossed body section and the embedded portion 52a of the 1 st ridge.

Further, fig. 23B is a sectional view taken along the line P-P of fig. 21. That is, fig. 23B shows a cross section of the 2 nd ridge 53. As shown in the figure, the 2 nd ridge 53 of this embodiment has an embedded portion 53a embedded in the main body 50 and an exposed portion 53b exposed from the main body 50, and the embedded portion 53a is disposed to be offset from the trench wall of the trench 50G. That is, in the embossed body section 502, the ventilation slit S2 is provided between the main body portion 50 of the embossed body section and the embedded portion 53a of the 2 nd ridge portion. The ventilation slits S1 and S2 are preferably 0.005mm to 0.05 mm.

As shown in fig. 23B, the embossed body section 50 of this embodiment includes a vent hole 50H in the main body portion 50 (in this embodiment, a groove 50G provided in the inner peripheral surface of the main body portion 50) for communicating the inner peripheral surface side and the outer peripheral surface side of the embossed body section 50. The vent holes 50H are cylindrical holes extending in a circular cross section in this embodiment, and as shown in fig. 24, a plurality of (5 in this example) vent holes are provided in the grooves 50H. Preferably, at least one (in this embodiment, both) of the vent slits S1, S2 is connected to the vent hole 50H, and more preferably, both of the vent slits S1, S2 are connected to the vent hole 50H.

In the case where at least one of the vent slits S1, S2 is connected to the vent hole 50H, when the tire is vulcanized and molded using the mold 500 including the embossed body segment 502P, air existing between the embossed body segment 502P and the rubber can leak from the vent hole 50H to the outside of the embossed body segment 502P via the slits S1, S2. Therefore, since it is not necessary to provide small holes (exhaust holes) for air discharge in the main body portion and/or the ridge portion of the embossed body segment as in the conventional art, so-called beads do not occur on the surface of the finished tire after vulcanization molding. If the embossed body segment 502P having the above-described structure is thus used, a flat tire can be easily manufactured.

In the main body portion 50 of this embodiment, as shown in fig. 24, 5 vent holes 50H are provided at substantially equal intervals in the groove 50G in which the 2 nd protruding portion 53 is disposed. In the mold of the present invention, the arrangement of the vent holes can be arbitrarily positioned in accordance with the shape of the tread pattern given to the tire.

In the embossed section 502 of this embodiment, it is preferable that the embedded portion 52a of the 1 st ridge 52 and/or the embedded portion 53a of the 2 nd ridge 53 all extend in the same direction.

Generally, the contour line of the inner peripheral surface of the main body portion of the embossed body segment is formed by connecting a plurality of arcs in the mold width direction, and the protruding portions arranged in the arc shape are inserted in the normal direction of the arcs, so that the protruding portions radially extend from the circumferential center of the mold. That is, the extending direction of the ridge portion with respect to the radial direction of the mold varies in each ridge portion. When the inner peripheral surface of the main body portion of the embossed body segment is subjected to the electric discharge machining using the projection portions, the directions of insertion and extraction of the projection portions with respect to the inner peripheral surface of the main body portion are variously changed in the projection portions, and therefore, particularly at positions where the directions of insertion and extraction of the projection portions and the normal line direction of the inner peripheral surface of the main body portion at the projection portions are increased, the groove width of the groove formed in the main body portion by the electric discharge machining may be excessively increased.

Here, if the embedded portions 52a, 53a of the 1 st protrusion 52 and/or the 2 nd protrusion 53 all extend in the same direction, the protrusion is inserted and pulled out in a fixed direction during the electric discharge machining, so that the protrusion does not excessively pick up the main body, and therefore the groove width of the groove formed in the main body by the electric discharge machining can be made close to the wall thickness of the protrusion. As a result, the accuracy of the mold can be improved.

As described above, the embedded portion 52a of the 1 st protrusion 52 and/or the embedded portion 53a of the 2 nd protrusion 53 all extend along the direction in which the protrusions 51 are pulled out from the main body 50.

Fig. 25 is a perspective view of a modification of the embossed body segment 502P shown in fig. 21, and shows a state in which the ridge portion 51 'is detached from the main body portion 50'. The protruding strip portion 51 'can be integrally inserted into and removed from the main body portion 50' as described above. In the protrusions 51 ', the thickness of the embedded portion 52a ' of the 1 st protrusion 52 ' and/or the embedded portion 53a ' of the 2 nd protrusion 53 ' (in the present embodiment, the embedded portion 53a ' of the 2 nd protrusion 53 ') is larger than the thickness of at least a part of the 1 st protrusion 52 ' and/or the 2 nd protrusion 53 '.

According to this configuration, the protruding portion 51 can be more stably held by the main body portion 50, and therefore the strength of the mold can be further improved.

In this case, too, the air vent slits S1 are provided between the main body portion 50 of the embossed body section 502P and the embedded portion 52a of the 1 st protruding strip 52, the air vent slits S2 are provided between the main body portion 50 and the embedded portion 53a of the 2 nd protruding strip 53, and the air vent 50H provided in the main body portion 50 communicates with these slits S1 and S2, whereby a flat tire can be easily manufactured.

Fig. 26A to 26F are cross-sectional views showing still another modification of the protruding portion 51. As shown in the drawing, the protrusions 51 'a to 51' F may have auxiliary grooves 51 'Ag to 51' Fg extending in the extending direction of the protrusions 51 'a to 51' F in the embedded portions 51 'Aa to 51' Fa of the protrusions 51 'a to 51' F. In this case, the volume of the ventilation slits S1, S2 between the main body portion 50 ' and the protrusions 51 ' a to 51 ' F is increased, and therefore, air can be discharged more smoothly during vulcanization molding of the tire. In the tire molding die according to the present invention, the auxiliary groove and the embedded portion in which the auxiliary groove is formed may be formed in any form, but for example, the following can be made.

In the example of fig. 26A, auxiliary grooves 51 'Ag are formed on both side surfaces of the embedded portion 51' Aa of the protrusion 51 'a, in this example, by a plurality of narrow grooves extending in the extending direction of the protrusion 51' a. In this case, by making the die radial direction positions of the narrow groove provided on one side surface of the embedded portion 51 ' Aa and the narrow groove provided on the other side surface different from each other, the volume of the ventilation slits S1, S2 between the embedded portion 51 ' Aa of the protruding portion 51 ' a and the main body portion 50 ' can be increased without extremely reducing the strength of the protruding portion 51 ' a.

In the example of fig. 26B, the thickness of the embedded portion 51 ' Ba of the ridge 51 ' B is thicker than at least a part of the thickness of the ridge 51 ' B, and auxiliary grooves 51 ' Bg similar to those in fig. 26A are formed on both side surfaces of the embedded portion 51 ' Ba. In this case, the volume of the ventilation slits S1, S2 can be increased while improving the strength of the protruding strip.

In the example of fig. 26C, in addition to the thickness of the embedded portion 51 'Ca of the ridge 51' C being thicker than at least a part of the thickness of the ridge 51 'C, 1 wide (about 1/3 width of the mold radial direction length of the embedded portion 51' Ca in this example) of the recessed portion 51 'Ca is formed on each of both side surfaces of the embedded portion 51' Ca. More specifically, the recess is formed in the mold radial direction inner portion of embedded portion 51' Ca. In this case, the manufacturing is easier than the case where a plurality of narrow slits are provided.

In the example of fig. 26C, in the cross-sectional view of the ridge 51 'C, the cross-sectional width of the embedded portion 51' Ca is larger at least on the outside in the die radial direction of the auxiliary groove 51 'Cg formed by the recessed portion than on the inside in the die radial direction of the auxiliary groove 51' Cg formed by the recessed portion. In other words, in the formation region of the auxiliary groove 51 'Cg, the outer width of the embedded portion 51' Ca gradually widens from the inside toward the outside in the mold radial direction.

Generally, when a discharge slit is introduced into a main body, the opening width of the discharge slit on the outer side in the die radial direction tends to be larger than the opening width on the inner side in the die radial direction. This is considered to be because the outer side of the discharge slit in the radial direction of the die is exposed to the electric discharge machining for a longer time than the inner side of the discharge slit in the radial direction of the die, and is eroded by the eluted material (slag). Here, if the cross-sectional width of embedded portion 51 'Ca is set as described above, it is easy to avoid an excessively large gap from being locally generated between embedded portion 51' Ca and the groove wall of groove 50 'G of main body 50'.

In the example of fig. 26D, as in the example shown in fig. 26C, in addition to 1 wide (about 1/3 width of the mold radial direction length of the embedded portion 51 'Da in this example) recess portion is formed on each of both side surfaces of the embedded portion 51' Da, a plurality of (two on one side in this example) narrow grooves are formed on the inner side in the mold radial direction of the wide recess portion. In this case, the volume of the ventilation slits S1, S2 between the protrusion 51 'D and the main body 50' can be further increased.

In the example of fig. 26E, as in the example shown in fig. 26C, 1 recess portion having a wide width (about 1/3 of the mold radial direction length of the embedded portion 51 'Ea in this example) is formed on each of both side surfaces of the embedded portion 51' Ea, and the cross-sectional width of the embedded portion 51 'Ea is constantly gradually increased from the inside toward the outside in the mold radial direction of the embedded portion 51' Ea. That is, the outline shape of the cross section of the embedded portion 51' Ea is a trapezoidal shape. In this case, it is easier to avoid an excessively large gap from being locally generated between the embedded portion 51 ' Ea and the groove wall of the groove 50 ' G of the main body 50 '.

In the example of fig. 26F, as in the example shown in fig. 26E, in addition to 1 wide (about 1/3 width in the mold radial direction length of embedded portion 51 'Fa in this example) recess portion is formed on each of both side surfaces of embedded portion 51' Fa, a plurality of (two on one side in this example) narrow slits are formed. In this case, the volume of the ventilation slits S1, S2 between the protruding strip 51 'F and the main body 50' can be increased.

Further, in this embossed body section 502P, the main body portion 50 and the ridge portion 51 are fixed in the holder 101 shown in fig. 1 so as to be fastened to each other by, for example, the arch bridge effect. In this case, the main body portion 50 and the protrusions 51 can be removed at the same time by removing the embossed body section 502P from the holder 101, and therefore cleaning (removal of clogging substances) between the main body portion 50 and the protrusions 51 can be performed easily. It goes without saying that the assembly after cleaning can be easily performed. However, the main body portion and the ridge portion may be fixed by a lateral cluster driving (japanese: lateral cluster driving ち Write み) system in accordance with the structure of the tread embossed body and the like.

< mold for tire Molding 6 >

Fig. 27 is a perspective view showing an embossed body segment 602P of a tire molding die 600 according to another embodiment of the present invention. The same structure of the embossed body segment 602P as that of the embossed body segments 102P to 502P described above will be omitted from description.

The embossed body segment 602P has a main body 60 for molding the outer contour of the tread surface of the tire, and a plurality of protrusions 61 extending from the main body 60 in the mold radial direction and giving a groove shape to the tread surface of the tire, and the protrusions 61 include a 1 st protrusion 62 and a 2 nd protrusion 63 extending so as to intersect with the 1 st protrusion 62. This embossed body segment 602P is different from the structure of the above-described embossed body segment 502P in that it corresponds to the amount of 2 pitches of the tread pattern given to the tread contact surface of the tire.

In this embodiment, the 1 st ridge 62 and the 2 nd ridge 63, which are embossed with a tread pattern of 2 pitches, are integrally formed. As shown in fig. 27, which is a perspective view of the protruding portion 61 of the present embodiment, the protruding portion 61 can be integrally detached and attached to the main body portion 60. As described above, when the ridges corresponding to the pitch of the tread pattern of 2 or more are integrally formed, the structure of the mold becomes simpler, and the assembly of the mold becomes easier.

Fig. 28 is a top view of the body portion 60 of the embossed body segment 602P shown in fig. 26. In the case where the protrusions corresponding to the 2-pitch or more of the tread pattern are integrally formed, it is preferable that at least 1 vent hole for air discharge provided in the main body portion 60 of the embossed body segment 602P is arranged in the closed space surrounded by the 1 st protrusion and the 2 nd protrusion in the plan view of the embossed body segment 602P. For example, as shown in fig. 28, it is preferable that the vent hole 60H is provided in the bottom of the groove 60G in which the protruding strip 61 is arranged, and it is particularly preferable that the vent hole 60H is provided in each of the regions (the regions D1 to D5 in the present embodiment) surrounded by the groove 60G.

< mold for tire Molding 7 >

Fig. 29 is a perspective view showing an embossed body segment 702P of a tire molding die 700 as another embodiment of the present invention. The same structure of the embossed body segment 702P as that of the embossed body segments 102P to 602P described above will not be described.

The embossed segment 702P has a main body 70 for molding the outer contour of the tread surface of the tire, and a plurality of ridges 71 extending from the main body 70 in the mold radial direction and giving a groove shape to the tread surface of the tire, and the ridges 71 include a 1 st ridge 72 and a 2 nd ridge 73 extending so as to intersect with the 1 st ridge 72. The embossed body segment 702P has a structure common to the above-described embossed body segment 602P in a point corresponding to the amount of 2 pitches of the tread pattern given to the tread contact surface of the tire, but is different from the above-described structure of the embossed body segment 602P in a point that the 2 nd ridge portions 73 adjacent in the mold circumferential direction are connected to each other by the connecting member 74.

Fig. 29 is a perspective view of the raised strip 71 of the embossed body segment 702P shown in fig. 28. In the protrusions 71, the embedded portions 72a of the 1 st protrusion 72 and/or the embedded portions 73a of the 2 nd protrusion 73 (the embedded portions 73a of the 2 nd protrusion 73 in the present embodiment) adjacent to each other in the mold circumferential direction are connected to each other by 1 or two connecting members 74. Since only the embedded portion 73a is connected, the connecting member 74 is embedded in the main body 70 when the main body 70 and the ridge portion 71 are assembled. Specifically, the coupling member 74 is provided such that the inner surface of the coupling member 74 in the mold radial direction is flush with the inner circumferential surface of the body portion 70.

When the protrusions 71 adjacent in the mold circumferential direction (in the present embodiment, the 2 nd protrusions 73) are connected in this way, the connection of the protrusions 71 becomes stronger, and therefore the strength of the mold can be further improved.

As shown in fig. 30, which is a plan view of the main body portion 70 of the embossed body segment 702P, in the case where the coupling member 74 is provided, it is also preferable that the vent hole provided in the main body portion 70 is provided at the bottom of the groove 70G where the protruding strip 71 is arranged, and it is particularly preferable that the vent hole 70H is provided in each of the regions (the regions D1 to D10 in the present embodiment) surrounded by the groove 70G.

In addition, in the groove in which the coupling member 74 is disposed, it is also preferable that the coupling member 74 is disposed to be offset from the groove wall, that is, a communication slit is provided between the coupling member 74 and the groove wall. This is because, in this case, air existing between the mold surface and the tire can be more efficiently discharged at the time of vulcanization molding of the tire.

In the case where the embossed body segments 502P, 602P, 702P described above include a ridge (hereinafter also referred to as a "separation ridge") for forming such a groove and/or sipe that terminates in a tread land portion in the tread contact surface of the tire, the separation ridge can be formed integrally with other ridges by using the connecting member described above.

In the embossed body segments 502P, 602P, and 702P, the recessed portions extending in the extending direction of the protrusions are provided in the embedded portions of the protrusions, so that the slits provided between the embedded portions of the protrusions and the groove walls of the main body can be provided. In this case, the protruding strip can be more stably fixed to the main body.

< method for manufacturing tire molding die 2 >

Next, a method of manufacturing the tire molding dies 500, 600, and 700 will be described. Here, the mold 500 described above will be described as an example.

In the method of manufacturing a mold according to this embodiment, when the mold section corresponding to the amount of 1 pitch of the tread pattern to be provided to the tread contact surface of the tire is set as the minimum unit of the mold, the method includes the protrusion forming step, the groove forming step, and the protrusion providing step in this order: in the projection forming step, at least a part of the 1 st projection 52 and at least a part of the 2 nd projection 53, which are at least the minimum unit of the mold, are integrally formed; in the groove forming step, a groove 50G for providing the integrally formed protruding strip portion 51 is formed in the main body portion 50 of the embossed body section 502P; in the protrusion setting step, the integrally formed protrusion 51 is inserted into the groove 50G.

In the method of manufacturing the mold, since the protruding portions 51 are integrally molded in advance, the mold can be easily assembled even in a mold for imparting a complicated tread pattern. Further, according to this structure, a tire molding die having improved strength can be easily obtained.

In particular, in the embossed body segment of the mold for providing the tread contact surface of the tire with the tread pattern in which the 1 st groove having a groove width larger on the groove bottom side than on the tread contact surface side and the 2 nd groove having the same groove width larger on the groove bottom side than on the tread contact surface side intersect with each other, the processing of the intersection portion of the 1 st protrusion 52 for forming the 1 st groove and the 2 nd protrusion 53 for forming the 2 nd groove takes many man-hours. A mold for imparting such a tread pattern can be manufactured with high accuracy and ease.

In the method of manufacturing the mold, it is preferable that when the portions of the 1 st protrusion 52 and the 2 nd protrusion 53 embedded in the main body portion 50 of the tread pattern body 502P are the embedded portions 52a and 53a and the portions exposed from the main body portion 50 are the exposed portions 52b and 53b, in the protrusion forming step, all the embedded portions 52a and 53a of the 1 st protrusion 52 and the 2 nd protrusion 53 are formed to extend in the same direction in the cross-sectional view of the mold for tire molding.

According to this configuration, when the main body portion 50 is subjected to the electric discharge machining using the protrusions 51, the groove width of the grooves formed by the protrusions 51 can be made to be close to the width of the embedded portion of the protrusions 51, and therefore the accuracy of the mold can be further improved.

In the method of manufacturing the mold, as in the modification of the mold 500 described above, it is preferable that the thickness of the embedded portions 52a and 53a of the 1 st ridge 52 and/or the 2 nd ridge 53 is made thicker than at least a part of the thickness of the 1 st ridge 52 and/or the 2 nd ridge 53 in the ridge forming step. According to this manufacturing method, a mold having further improved strength can be obtained.

In the method of manufacturing the mold, it is preferable that in the ridge forming step, as in the mold 700 described above, the 1 st ridge 72 and/or the 2 nd ridge 73 are connected by the connecting member 74, and the connecting member 74 is provided between the embedded portions 72a of the 1 st ridge 72 and/or the embedded portions 73a of the 2 nd ridge 73. With this structure, a mold having further improved strength can be obtained.

In the method of manufacturing the mold, it is preferable that in the groove forming step, as in the molds 500, 600, and 700 described above, the groove 50G formed in the main body portion 50 of the embossed body section 502P is formed to be wider than the thickness of the embedded portion of the integrally formed ridge portion 51, and a vent hole 50H communicating the inner peripheral surface side and the outer peripheral surface side of the embossed body section 502P is formed in the groove bottom of the groove 50G. According to this structure, a flat tire can be easily obtained.

Further, in the tires manufactured using the above-described molds 500, 600, 700 for tire molding, since the molds 500, 600, 700 can be manufactured by assembling only the components of the 1 st protrusion and the 2 nd protrusion that form the embossed body segment, the tires can be easily manufactured even with a complicated tread pattern.