阅读说明：本技术 一种半模组件及模具 (Half module and mould ) 是由 孙君武 历虎 景梦生 张奎 付翊宸 杨俊伟 于 2020-04-15 设计创作，主要内容包括：本发明涉及一种半模组件及模具,半模组件包括模套；模芯插装在模套内,模芯朝向合模方向的端面与模套的内壁面围成该半模组件用于成型工件的成型腔；所述模芯为沿背向合模方向径向尺寸逐渐变小的锥台结构,所述模套的内壁面与模芯配合的部分为与模芯形状适配的锥形面；所述模芯通过热装的方式安装在模套内,通过热压改变模芯在模套内的安装位置可以改变成型腔的大小,由此使得模具能够适用于生产不同尺寸的工件,无需针对不同尺寸的工件配置不同的模具,降低工件的生产制造成本。(The invention relates to a half-mold assembly and a mold, wherein the half-mold assembly comprises a mold sleeve; the mold core is inserted into the mold sleeve, and the end surface of the mold core facing the mold closing direction and the inner wall surface of the mold sleeve enclose a molding cavity of the half mold assembly for molding a workpiece; the die core is of a frustum structure with the radial size gradually reduced along the direction back to the die assembly direction, and the part of the inner wall surface of the die sleeve, which is matched with the die core, is a conical surface matched with the shape of the die core; the mold core is installed in the mold sleeve in a hot-filling mode, and the size of the forming cavity can be changed by changing the installation position of the mold core in the mold sleeve through hot pressing, so that the mold can be suitable for producing workpieces with different sizes, different molds do not need to be configured for the workpieces with different sizes, and the production and manufacturing cost of the workpieces is reduced.)

1. A mold half assembly comprising:

die sleeve;

the mold core is inserted into the mold sleeve, and the end surface of the mold core facing the mold closing direction and the inner wall surface of the mold sleeve enclose a forming cavity of the half mold assembly for forming a workpiece;

the method is characterized in that:

the die core is of a frustum structure with the radial size gradually reduced along the direction back to the die assembly direction, and the part of the inner wall surface of the die sleeve, which is matched with the die core, is a conical surface matched with the shape of the die core;

the mold core is installed in the mold sleeve in a hot-charging mode, and the size of the forming cavity can be changed by changing the installation position of the mold core in the mold sleeve through hot pressing.

2. The mold half assembly of claim 1, wherein: the taper of the mold core is not more than 10 degrees.

3. The mold half assembly of claim 2, wherein: the taper of the mold core is 5-8 degrees.

4. The half-mold assembly of any one of claims 1-3, wherein: the inner wall surface of the die sleeve is a conical surface with consistent taper.

5. The half-mold assembly of any one of claims 1-3, wherein: the hardness of the mold core is greater than that of the mold sleeve.

6. The mold half assembly of claim 5, wherein: the mold core is made of hard alloy, and the mold sleeve is made of mold steel.

7. The half-mold assembly of any one of claims 1-3, wherein: half module still includes the backing plate for fix on half module's die holder, the die sleeve is installed the one side of orientation compound die direction of backing plate, half module still includes at least one adjusting shim for the pad dress is between die sleeve and backing plate after the mold core position control, and the gross thickness of each adjusting shim is the same with the position adjustment volume of mold core, and the adjusting shim has the hole of dodging for the outstanding part of die sleeve after being used for dodging the mold core adjustment position.

8. A mold, comprising:

an upper mold half assembly;

a lower half mold assembly;

one of the upper and lower mold half assemblies is the mold half assembly of any one of claims 1-7.

9. The mold of claim 8 wherein said upper mold half is said mold half.

Technical Field

The invention relates to a half-mold assembly and a mold.

Background

Die extrusion is an efficient material forming method in which a pressure is applied to a blank by a die to plastically deform the blank in a die cavity to form a workpiece having the same shape and size as the die cavity. The used die comprises an upper half die assembly and a lower half die assembly, the upper half die assembly and the lower half die assembly are closed to enclose a die cavity, and a workpiece is extruded and formed in the die cavity.

The large-scale inner hexagonal bolt blank hot forging die comprises an upper half die assembly and a lower half die assembly, wherein the upper half die assembly is provided with an upper male die, the upper male die is matched with an upper end flange of an upper die base plate and is tightly pressed and fixed on an upper fixing plate, so that the upper male die is fixed relative to the upper die plate, the upper male die can move up and down along with the upper die plate, and the lower end of the upper male die is provided with a hexagon head and an arc-shaped surface, so that an inner hexagonal hole and an end face chamfer can be formed in the head of a bolt. The lower die assembly comprises a first molding plate, a second molding plate and an ejector rod, screw molding holes are formed in the first molding plate and the second molding plate, and the ejector rod extends into the screw molding holes. When the screw forming die works, the upper male die and the ejector rod are matched up and down through die assembly of the upper die assembly and the lower die assembly, and a blank is extruded and formed into the hexagon socket head cap screw in the screw forming hole.

Although the die can efficiently extrude a blank into a workpiece, the die assembly stroke of the upper half die assembly and the lower half die assembly of the die is fixed, the mounting position of the upper convex die on the upper half die assembly is fixed, the position of the ejector rod in the screw forming hole during forming is fixed, and the shape and the size of the screw forming hole are fixed, so that the upper half die assembly and the lower half die assembly can only enclose a die cavity with a specific size after die assembly, the die can only produce a single-type screw, and if the axial size of the head of a bolt to be produced is changed, a new upper convex die needs to be correspondingly configured or a new set of die needs to be configured, and the production cost is directly increased.

Disclosure of Invention

The invention aims to provide a die, which aims to solve the technical problem of high production cost caused by the fact that the die can only form workpieces with single size and different dies need to be configured when workpieces with different sizes are produced in the prior art; it is also an object of the present invention to provide a mold half assembly.

In order to solve the technical problem, the upper die assembly adopts the following technical scheme:

a half-mold assembly comprising a mold sleeve; the mold core is inserted into the mold sleeve, and the end surface of the mold core facing the mold closing direction and the inner wall surface of the mold sleeve enclose a molding cavity of the half mold assembly for molding a workpiece; the die core is of a frustum structure with the radial size gradually reduced along the direction back to the die assembly direction, and the part of the inner wall surface of the die sleeve, which is matched with the die core, is a conical surface matched with the shape of the die core; the mold core is installed in the mold sleeve in a hot-charging mode, and the size of the forming cavity can be changed by changing the installation position of the mold core in the mold sleeve through hot pressing.

The beneficial effects are that: the mold core is of a frustum structure, the mold sleeve is matched with the mold core through the conical surface, so that the mold core can be fixed in the mold sleeve in a hot-assembling close fit mode, the radial size of the mold core is gradually reduced along the direction back to the mold closing direction, the inner wall surface of the mold sleeve can stop the mold core along the direction back to the mold closing direction, the size of a forming cavity formed by the mold core and the mold sleeve is guaranteed not to be changed due to the reverse stress of the mold core on the extrusion of a workpiece during extrusion, and the mold using the half mold assembly can extrude the workpiece with the qualified size. Meanwhile, when the size of the workpiece to be produced is changed, the mounting position of the mold core in the mold sleeve can be adjusted in a hot pressing mode, the mounting position of the mold core in the mold sleeve is changed to change the position of the end face, facing the mold closing direction, of the mold core in the mold sleeve, so that the size of the forming cavity of the half mold assembly is adjusted, the mold using the half mold assembly can produce workpieces with different sizes, different molds do not need to be arranged for the workpieces with different sizes, and the production and manufacturing cost of the workpieces is reduced.

Further, the taper of the mold core is not more than 10 degrees.

The beneficial effects are that: the mold core taper is not more than 10 degrees, so that the mold core can be conveniently moved by hot pressing when the size of the mold cavity of the half mold is adjusted.

Further, the taper of the mold core is 5-8 degrees.

The beneficial effects are that: the taper of the mold core is set to be 5-8 degrees, and the taper ensures that the inner wall surface of the mold sleeve can form a stable stop for the mold core, so that the mold core of the mold with the half-mold assembly can be stably positioned at a set position when in work, and extruded workpieces are ensured to be consistent in size. Meanwhile, the taper is arranged, the situation that the position of the mold core is difficult to move due to overlarge taper is avoided, and the size of the forming cavity of the half mold assembly is convenient to adjust.

Further, the inner wall surface of the die sleeve is a conical surface with consistent taper.

The beneficial effects are that: the inner wall surface of the die sleeve is a conical surface, so that the circumferential wall surface of the forming cavity of the half die assembly is a conical surface, a workpiece can be conveniently separated from the forming cavity, meanwhile, the taper of the inner wall surface of the die sleeve is consistent, the conical surface matched with the die core and the conical surface surrounding the forming cavity can be processed at one time, and the die sleeve is convenient to process and manufacture.

Further, the hardness of the mold core is greater than that of the mold sleeve.

The beneficial effects are that: when the position of the mold core in the mold sleeve is adjusted in a hot pressing mode, the mold core is higher than the mold sleeve in hardness, so that the position of the mold core can be adjusted by stretching and deforming the mold sleeve, and the influence on the precision of the mold due to the change of the shape of the mold core in the adjusting process is avoided.

Further, the mold core is made of hard alloy, and the mold sleeve is made of mold steel.

The beneficial effects are that: the mold core and the mold sleeve are made of hard alloy steel and mold steel respectively, so that the mold core and the mold sleeve of the mold with the half-mold assembly have high strength, and meanwhile, the hard alloy steel is more resistant to high temperature, and the mold core is not easy to deform due to hot pressing when the position of the mold core is adjusted through hot pressing.

Further, half module still includes the backing plate for fix on half module's die holder, the die sleeve is installed the one side of orientation compound die direction of backing plate, half module still includes at least one adjusting shim for cushion dress between die sleeve and backing plate after the mold core position adjustment, the gross thickness of each adjusting shim is the same with the position adjustment volume of mold core, the adjusting shim has the hole of dodging for the outstanding part of die sleeve after being used for dodging the mold core adjustment position.

The beneficial effects are that: the die sleeve is installed on one side of the backing plate towards the die assembly direction, avoid the die sleeve to cause damage to the die holder, improve half module's durability, simultaneously, set up the adjusting shim and fill up the dress between die sleeve and backing plate after the die core position adjustment, the hole of dodging of adjusting shim can dodge the thickness of die core and adjusting shim and the position adjustment volume of die core the same, guarantee that the terminal surface of die core back to the die assembly direction after half module assembly is assembled is parallel and level with the terminal surface of adjusting shim and cooperate with the terminal surface of backing plate towards the die assembly direction jointly from this, the mould that uses this half module can realize the stable maintenance of relative position with the die sleeve at its die core of during operation.

In order to solve the technical problems, the die adopts the following technical scheme:

a mold comprising an upper mold half assembly and a lower mold half assembly, one of the upper mold half assembly and the lower mold half assembly comprising a chase; the mold core is inserted into the mold sleeve, and the end surface of the mold core facing the mold closing direction and the inner wall surface of the mold sleeve enclose a molding cavity of the half mold assembly for molding a workpiece; the die core is of a frustum structure with the radial size gradually reduced along the direction back to the die assembly direction, and the part of the inner wall surface of the die sleeve, which is matched with the die core, is a conical surface matched with the shape of the die core; the mold core is installed in the mold sleeve in a hot-charging mode, and the size of the forming cavity can be changed by changing the installation position of the mold core in the mold sleeve through hot pressing.

The beneficial effects are that: the mold core is of a frustum structure, the mold sleeve is matched with the mold core through the conical surface, so that the mold core can be fixed in the mold sleeve in a hot-assembling close fit mode, the radial size of the mold core is gradually reduced along the direction back to the mold closing direction, the inner wall surface of the mold sleeve can stop the mold core along the direction back to the mold closing direction, the size of a forming cavity formed by the mold core and the mold sleeve is guaranteed not to be changed due to the reverse stress of the mold core on the extrusion of a workpiece during extrusion, and the mold using the half mold assembly can extrude the workpiece with the qualified size. Meanwhile, when the size of a workpiece to be produced is changed, the mounting position of the mold core in the mold sleeve can be adjusted in a hot pressing mode, the mounting position of the mold core in the mold sleeve is changed to change the position of the end face, facing the mold closing direction, of the mold core in the mold sleeve, so that the size of the forming cavity of the half mold assembly is adjusted, the mold can produce workpieces with different sizes, different molds do not need to be arranged for the workpieces with different sizes, and the production and manufacturing cost of the workpieces is reduced.

Further, the taper of the mold core is not more than 10 degrees.

The beneficial effects are that: the mold core taper is not more than 10 degrees, so that the mold core can be conveniently moved by hot pressing when the size of the half mold forming cavity is adjusted, and the convenience of adjusting the size of the mold cavity of the mold is improved.

Further, the taper of the mold core is 5-8 degrees.

The beneficial effects are that: the taper of the mold core is set to be 5-8 degrees, and the taper ensures that the inner wall surface of the mold sleeve can form a stable stop for the mold core, so that the mold core of the mold with the half-mold assembly can be stably positioned at a set position when in work, and extruded workpieces are ensured to be consistent in size. Meanwhile, the taper is arranged, the situation that the position of the mold core is difficult to move due to overlarge taper is avoided, and the size of a forming cavity of the half mold assembly of the mold is convenient to adjust.

Further, the inner wall surface of the die sleeve is a conical surface with consistent taper.

The beneficial effects are that: the inner wall face of the die sleeve is a conical face, so that the circumferential wall face of the forming cavity of the half die assembly is a conical face, a workpiece can be conveniently separated from the forming cavity, meanwhile, the taper of the inner wall face of the die sleeve is consistent, the conical face matched with the die core and the conical face surrounding the forming cavity can be processed at one time, the die sleeve is convenient to process and manufacture, and the convenience of die production and manufacturing is further improved.

Further, the hardness of the mold core is greater than that of the mold sleeve.

The beneficial effects are that: when the position of the mold core in the mold sleeve is adjusted in a hot pressing mode, the mold core is higher than the mold sleeve in hardness, so that the position of the mold core can be adjusted by stretching and deforming the mold sleeve, and the influence on the precision of the mold due to the change of the shape of the mold core in the adjusting process is avoided.

Further, the mold core is made of hard alloy, and the mold sleeve is made of mold steel.

The beneficial effects are that: the mold core and the mold sleeve are made of hard alloy steel and mold steel respectively, so that the mold core and the mold sleeve of the mold with the half-mold assembly have high strength, and meanwhile, the hard alloy steel is more high-temperature resistant, when the position of the mold core is adjusted through hot pressing, the mold core is not easy to deform due to hot pressing, and the accuracy of the mold is not influenced by adjusting the size of the mold cavity.

Further, half module still includes the backing plate for fix on half module's die holder, the die sleeve is installed the one side of orientation compound die direction of backing plate, half module still includes at least one adjusting shim for cushion dress between die sleeve and backing plate after the mold core position adjustment, the gross thickness of each adjusting shim is the same with the position adjustment volume of mold core, the adjusting shim has the hole of dodging for the outstanding part of die sleeve after being used for dodging the mold core adjustment position.

The beneficial effects are that: the die sleeve is installed on one side of the backing plate towards the die assembly direction, avoid the die sleeve to cause damage to the die holder, improve half module's durability, and simultaneously, set up the adjusting shim and fill up between die sleeve and backing plate after the die core position adjustment, the hole of dodging of adjusting shim can dodge the thickness of die core and adjusting shim and the position adjustment volume of die core the same, guarantee that the terminal surface of die core back to the die assembly direction after half module assembly has been assembled is parallel and level with the terminal surface of adjusting shim and cooperate with the terminal surface of backing plate towards the die assembly direction jointly, the mould that uses this half module can realize relative position's steady maintenance at its die core and die sleeve during operation.

Further, the upper mold half assembly comprises a mold sleeve; the mold core is inserted into the mold sleeve, and the end surface of the mold core facing the mold closing direction and the inner wall surface of the mold sleeve enclose a molding cavity of the half mold assembly for molding a workpiece; the die core is of a frustum structure with the radial size gradually reduced along the direction back to the die assembly direction, and the part of the inner wall surface of the die sleeve, which is matched with the die core, is a conical surface matched with the shape of the die core; the mold core is installed in the mold sleeve in a hot-charging mode, and the size of the forming cavity can be changed by changing the installation position of the mold core in the mold sleeve through hot pressing.

The beneficial effects are that: the upper half die assembly is set as the half die assembly with the size of the forming cavity adjustable, and the ejection piece of the die can be set on the lower half die assembly, so that the upper half die assembly and the lower half die assembly are both convenient to produce and manufacture.

Drawings

FIG. 1 is a schematic structural view of a mold of example 1 of the present invention;

FIG. 2 is a schematic view of the fitting structure of the upper fixing sleeve, the upper die sleeve and the upper die core of the upper die assembly of the die of embodiment 1 of the invention;

FIG. 3 is a schematic view of the mating structure of the upper shell and the upper core of the upper half module of the mold assembly of example 1 of the invention;

in the figure: 1-forming a cavity in the upper half die; 2-lower half-mould forming cavity; 3-an upper die holder; 4, arranging a base plate; 5, an upper pressing plate; 6-fixing the sleeve; 7-mounting a die sleeve; 8, mounting a mold core; 9-a lower die holder; 10-lower fixing sleeve; 11-a lifter bar; 12-a pusher bar; 13-a lower press plate; 14-lower die sleeve; 15-lower mold core; 16-lower backing plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The features and properties of the present invention are described in further detail below with reference to examples.

Specific example 1 of the mold of the present invention: the present invention is directed to a die with an adjustable die cavity size, so that the die can extrude workpieces of different sizes through adjustment of the die cavity size, and the die can be any die capable of extruding workpieces through the die, such as gears, bushings, screws, bolts, and the like, in terms of the workpieces to be formed. In the present embodiment, the structure and the operation principle of the die of the present invention are described by taking an extrusion molding bolt as an example.

As shown in fig. 1, the mold comprises an upper mold half assembly and a lower mold half assembly, the upper mold half assembly is provided with an upper mold half forming cavity 1, the lower mold half assembly is provided with a lower mold half forming cavity 2, and the forming cavities of the upper and lower mold half assemblies form a mold cavity of the mold, wherein the upper mold half forming cavity 1 is used for forming a head part of a bolt, and the lower mold half forming cavity 2 is used for forming a rod part of the bolt. When the die is closed, the upper half die assembly moves from top to bottom to close the die and is matched with the lower half die assembly to extrude the blank in the die cavity into a workpiece.

Regarding the structure of the upper mold half, as shown in fig. 1, the upper mold half includes an upper mold base 3, an upper backing plate 4, an upper press plate 5, an upper fixing sleeve 6, an upper mold sleeve 7, and an upper mold core 8. Wherein, the middle part of upper die base 3 has seted up the backing plate mounting hole, and upper padding plate 4 is fixed in the backing plate mounting hole of upper die base 3, and the lower terminal surface of upper padding plate 4 and the lower terminal surface parallel and level of upper die base 3.

As shown in fig. 2, the upper fixing sleeve 6 is provided with a die sleeve mounting hole matched with the upper die sleeve 7, and the upper die sleeve 7 is fixedly mounted in the die sleeve mounting hole of the upper fixing sleeve 6 during assembly. As shown in fig. 2 and 3, the upper mold core 8 is installed in the upper mold sleeve 7, and an end surface of the upper mold core 8 facing the mold closing direction and an inner wall surface of the upper mold sleeve 7 cooperate to enclose an upper mold half forming cavity 1.

The upper pressing plate 5 is provided with a fixing sleeve mounting hole for inserting the upper fixing sleeve 6, specifically, the upper end of the upper fixing sleeve 6 is provided with a circle of outer flanges, the fixing sleeve mounting hole of the upper pressing plate 5 is a step hole matched with the shape of the upper fixing sleeve 6, and the upper pressing plate 5 is in stop fit with the outer flanges at the upper end of the upper fixing sleeve 6 along the up-down direction through the step surface in the fixing sleeve mounting hole, so that the assembly consisting of the upper fixing sleeve 6, the upper die sleeve 7 and the upper die core 8 is prevented from being separated from the lower end of the. When the upper half die assembly is assembled, the upper pressing plate 5 is fixed on the upper die base 3, and the assembly formed by the upper fixing sleeve 6, the upper die sleeve 7 and the upper die core 8 is pressed and fixed on the lower end face of the upper backing plate 4, so that the upper half die assembly is assembled. After the assembly is completed, the upper fixed sleeve 6, the upper die sleeve 7, the upper die core 8 and the upper end surface of the upper pressing plate 5 are flush. When the die is mounted on the press, the upper die assembly is mounted on the press through the upper die holder 3.

In the concrete structure, the upper die core 8 is a frustum structure with the radial size gradually reduced along the direction back to the die assembly direction, correspondingly, the inner wall surface of the upper die sleeve 7 is an inner conical surface with the taper consistent with the taper of the outer peripheral surface of the upper die core 8, during installation, the upper die core 8 and the upper die sleeve 7 are matched through a conical surface, the upper die core 8 is assembled in the upper die sleeve 7 in a hot-assembling mode, and the upper die core 8 is fixed in the upper die sleeve 7 in an interference fit mode.

In order to enable the end face of the head of the formed bolt to be provided with a chamfer, the edge of the end face of the upper die core 8 facing the die assembly direction is provided with a circle of flange, and the flange is in smooth transition with the end face of the upper die core 8, so that after the upper die core 8 is assembled in the upper die sleeve 7, the inner wall of the upper die sleeve 7 which is enclosed into an upper half die forming cavity is in smooth transition with the end face of the upper die core 8, and the end face of the bolt is ensured to be directly provided with the chamfer after being formed.

When the mold is in operation, the inner conical surface of the upper mold sleeve 7 can block the upper mold core 8 along the direction opposite to the mold closing direction, and the inner conical surface and the upper backing plate 4 together block the upper mold core 8 along the vertical direction, so that the upper mold core 8 is prevented from being forced to move towards the direction opposite to the mold closing direction when the mold extrudes a blank, and the upper mold core 8 is ensured to be stably positioned at the set installation position in the upper mold sleeve 7, so that the upper half mold forming cavity 1 can always keep the set size in the mold working process, and the same batch of processed workpieces are ensured to be consistent in size.

Meanwhile, based on the fact that the upper mold core 8 is installed in the upper mold sleeve 7 in a pressing mode through the conical matching surface in an interference mode, when the size of the upper half mold forming cavity 1 needs to be adjusted, the upper mold core 8 is pushed in the direction opposite to the mold closing direction through a press machine, the position of the end face, facing the mold closing direction, of the upper mold core 8 in the upper mold sleeve 7 can be changed, and therefore the size of the upper half mold forming cavity 1 can be adjusted. During specific adjustment, the upper die core 8 and the upper die sleeve 7 which are fixed together in an interference fit mode can be heated to reduce the difficulty of adjusting the position of the upper die core 8, and then the size of the upper half die forming cavity 1 is adjusted by applying force to the lower die core 8 through the press machine. The heating temperature is controlled to be about 400 ℃ so as to prevent the crystal grains of the upper mold core 8 and the upper mold sleeve 7 from changing.

Because the up end of the upper die core 8 after adjusting the position is upwards convex compared with the up end of the upper die sleeve 7, the upper fixed sleeve 6 and the upper pressure plate 5, therefore, the upper half die assembly further comprises an adjusting gasket (not shown in the figure) which is used for cushioning the upper fixed sleeve 6 and the upper die sleeve 7 after adjusting the position of the upper die core 8, the middle part of the adjusting gasket is provided with an avoiding hole which is used for avoiding the end part of the upper die core 8 which is upwards convex compared with the upper die sleeve 7 after adjusting the position, in addition, the thickness of the adjusting gasket is equal to the adjusting amount of the upper die core 8, and the thickness of the adjusting gasket is equal to the length which is upwards convex relative to the upper die sleeve 7 after adjusting. In other embodiments, a plurality of adjusting shims can be stacked and padded among the upper fixing sleeve, the upper die sleeve and the upper base plate, and at the moment, the sum of the thicknesses of the adjusting shims is equal to the adjustment amount of the upper die core.

In this embodiment, the upper mold core 8 is made of hard alloy steel, the upper mold sleeve 7 is made of H13 hot-work die steel, and the upper mold base is made of carbon steel. The upper mold core 8 and the upper mold sleeve 7 are made of steel with high hardness, so that the upper mold core 8 and the upper mold sleeve 7 are not easy to deform when the mold is used, and the mold has stable and reliable working performance. Meanwhile, the upper mold core 8 is made of hard alloy steel which is better in heat resistance and higher in hardness than the upper mold sleeve 7, so that the upper mold core 8 is not easy to deform during hot charging and position adjustment, and the annular bulge on the end face of the upper mold core is prevented from breaking. In other embodiments, the upper die core can also be made of die steel, and the die sleeve is made of carbon steel, so that the hardness of the upper die core is greater than that of the upper die sleeve. In other embodiments, the upper mold core and the upper mold sleeve can be made of materials with the same hardness, and the upper mold sleeve is heated from the outer side of the upper mold sleeve during heating, so that the temperature of the upper mold sleeve is higher than that of the upper mold core, and the upper mold core is more difficult to deform compared with the upper mold sleeve.

In order to ensure that the inner wall surface of the upper die sleeve 7 can stop the upper die core 8 and can conveniently adjust the position of the upper die core 8, the taper of the outer peripheral surface of the upper die core 8 and the inner wall surface of the upper die sleeve 7 is controlled to be not more than 10 degrees, wherein when the taper is set to be 5-8 degrees, the inner wall surface of the upper die sleeve 7 can stably stop the upper die core 8 and simultaneously can conveniently adjust the position of the upper die core 8. Of course, if the force required when extruding the workpiece is relatively small, the taper of the outer peripheral surface of the upper core and the inner wall surface of the upper die sleeve may be set to be less than 5 degrees, such as 2 degrees, 3 degrees, or 4 degrees, thereby making the position of the core easy to adjust by hot pressing, and of course, if the amount of adjustment required for the core is small, the taper of the outer peripheral surface of the upper core and the inner wall surface of the upper die sleeve may be set to be more than 8 degrees, such as 9 degrees or 10 degrees, in order to stably place the upper core in the mounting position when the die is in operation. Even in other embodiments, if the amount of adjustment required by the upper mold core during the use of the mold is very small, the taper of the outer peripheral surface of the upper mold core and the inner wall surface of the upper mold sleeve can be set to be more than 10 degrees.

In this embodiment, the inner wall of the upper mold sleeve 7 is integrally machined into an inner conical surface with the same taper as the outer wall surface of the upper mold core 8, so that the upper half mold forming cavity 1 is of a flaring structure, and a workpiece can be conveniently separated from the upper half mold forming cavity 1 after being formed. Meanwhile, the whole taper of the inner wall surface is consistent, so that the whole inner wall surface of the upper die sleeve 7 can be conveniently processed together.

In other embodiments, only the part of the inner wall surface of the upper die sleeve, which is matched with the upper die core, can be processed into an inner conical surface with the same taper as that of the upper die core, and for the part which encloses the upper half die forming cavity, the taper of the part can be designed and processed independently, so that the upper half die forming cavity is convenient for workpiece demoulding. Certainly, for the bolt with the smaller axial head size, the contact area between the bolt head and the cavity wall of the upper half die forming cavity is smaller, if the friction force between the bolt head and the cavity wall of the upper half die forming cavity cannot hinder the bolt from coming out of the upper half die forming cavity, the upper half die forming cavity may not be set to be a flaring structure.

The structure of the lower half-die assembly is shown in fig. 1, and the lower half-die assembly comprises a lower die base 9, a lower fixing sleeve 10, an ejector rod 11, a material pushing rod 12, a lower pressing plate 13, a lower die sleeve 14, a lower die core 15 and a lower backing plate 16. During assembly, the lower fixing sleeve 10 is fixed on the upper end face of the lower die base 9, the lower die core 15 is fixedly installed in the lower die sleeve 14, an assembly formed by assembling the lower die core 15 and the lower die sleeve 14 is installed in the lower fixing sleeve 10, and meanwhile, a lower cushion plate 16 is arranged between the assembly formed by the lower die core 15 and the lower die sleeve 14 and the lower die base 9. The upper end of the lower die sleeve 14 is a small-diameter section, a transition surface between the small-diameter section and the large-diameter section is a horizontal step surface, correspondingly, the lower pressing plate 13 is provided with a step through hole matched with the shape of the upper end of the lower die sleeve 14, and the lower pressing plate 13 is in stop fit with the step surface of the lower die sleeve 14 through the step surface of the step through hole and is fixed on the lower die sleeve 14, so that the assembly formed by the lower die core 15 and the lower die sleeve 14 is installed in the lower fixing sleeve 10.

The middle part of the lower mold core 15 is provided with a central hole which is through along the vertical direction, the central hole forms a lower half mold forming cavity 2 of the lower half mold assembly, correspondingly, through holes which are aligned with the central hole of the lower mold core 15 are arranged on the lower backing plate 16 and the lower mold base 9, and the aperture of the hole arranged on the lower backing plate 16 is larger than that of the central hole of the lower mold core 15 and that of the hole arranged on the lower mold base 9. An ejector rod 11 is arranged in a central hole of the lower die core 15, the ejector rod 11 is of an inverted T-shaped structure comprising a rod part and a stop part, the rod part extends into the central hole of the lower die core 15, and the stop part is located in a hole of the lower backing plate 16 and can move up and down in the hole of the lower backing plate. A material pushing rod 12 is inserted into the central hole of the lower die holder 9, the material pushing rod 12 is also a T-shaped structure with a rod part and a stop part, the stop part is located in the hole of the lower backing plate 16 and located at the lower side of the material pushing rod 11, and the rod part penetrates through the hole of the lower die holder and extends downwards. When the mold is opened, the material pushing rod 12 moves upwards and pushes the material ejecting rod 11 to move upwards under the pushing of the press, so as to eject the workpiece positioned in the lower half mold forming cavity 2. Ejector pins 11 and ejector pins 12 form the ejector of the lower half-mould assembly.

Different from the embodiment 1, the embodiment 2 of the mold of the present invention is that, in this embodiment, the mounting positions of the upper and lower mold half assemblies are interchanged during mounting, and at this time, the lower mold half assembly is a mold half assembly with an adjustable molding cavity.

Different from embodiment 1, in embodiment 3 of the die of the present invention, the upper die holder is not provided with the backing plate mounting hole, and the upper backing plate is directly fixed on the lower end surface of the upper die holder by other means, for example, by bolts.

Different from the embodiment 1, the embodiment 4 of the die of the invention is different from the embodiment 1 in that an upper pressing plate is not arranged, and an upper fixing sleeve is directly fixed on an upper die holder through a bolt, so that the assembly consisting of the upper fixing sleeve, the upper die sleeve and the upper die core is fixed on the upper die holder.

The embodiment 5 of the die of the invention is different from the embodiment 1 in that no backing plate is arranged on the upper die holder in the embodiment, and naturally, no backing plate mounting hole is arranged on the upper die holder, and during assembly, the upper end surfaces of the upper die core, the upper die sleeve, the upper fixing sleeve and the upper pressure plate are directly attached to the lower end surface of the upper die holder.

Different from the embodiment 1, in the embodiment 6 of the die, the adjusting gasket is not arranged on the upper half die assembly, the upper backing plate is directly provided with the avoiding hole for avoiding the upper die core, and when a workpiece is extruded, the upper die core is ensured not to generate position change after being stressed by the matching conical surface between the upper die sleeve and the upper die core.

In the embodiment of the half-mold assembly of the present invention, the half-mold assembly is a half-mold assembly with a molding cavity of which the size can be adjusted, so that the mold with the half-mold assembly can produce workpieces with different sizes.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.