阅读说明：本技术 复合式鞋楦及其制备方法 (Composite shoe tree and preparation method thereof ) 是由 斋藤胜雄 黄展宏 于 2021-08-03 设计创作，主要内容包括：本发明涉及制鞋技术领域,尤指一种复合式鞋楦及其制备方法,复合式鞋楦包括鞋楦和夹持件,鞋楦包括铝楦芯和塑料楦壳；铝楦芯设有上端面,塑料楦壳通过注塑包裹住铝楦芯除上端面的所有区域；夹持件可拆卸安装在铝楦芯的上端面。制备该复合式鞋楦的方法包括制备铝楦芯、注塑、冷却定型、精加工这四大步骤。本发明通过将鞋楦设计成内外两层的复合式结构,通过在铝楦芯外包塑料楦壳,塑料楦壳可重复使用加工成不同尺寸的鞋楦,其利用成本低,步骤简单；再通过在铝楦芯的上端面可拆卸连接有夹持件,通过夹持件可以将鞋楦更好地固定在器械上,由于夹持件是安装在铝楦芯上,而非塑料楦壳,不会对鞋楦造成损坏。(The invention relates to the technical field of shoemaking, in particular to a composite shoe tree and a preparation method thereof, wherein the composite shoe tree comprises a shoe tree and a clamping piece, and the shoe tree comprises an aluminum shoe tree core and a plastic shoe tree shell; the plastic last shell wraps all areas of the aluminum last core except the upper end face through injection molding; the clamping piece is detachably arranged on the upper end surface of the aluminum last core. The method for preparing the composite shoe tree comprises four steps of preparing an aluminum last core, injection molding, cooling and shaping and finish machining. According to the invention, the shoe tree is designed into a composite structure with an inner layer and an outer layer, and the plastic last shell is wrapped outside the aluminum last core, so that the plastic last shell can be repeatedly used and processed into the shoe trees with different sizes, the utilization cost is low, and the steps are simple; the upper end surface of the aluminum last core is detachably connected with the clamping piece, the shoe tree can be better fixed on the apparatus through the clamping piece, and the clamping piece is arranged on the aluminum last core and is not a plastic last shell, so that the shoe tree cannot be damaged.)

1. A combined type shoe tree which is characterized in that: the shoe last comprises a shoe last and a clamping piece, wherein the shoe last comprises an aluminum last core and a plastic last shell; the plastic last shell wraps all areas of the aluminum last core except the upper end face through injection molding; the clamping piece is detachably arranged on the upper end surface of the aluminum last core.

2. The composite last according to claim 1, wherein: the shoe tree is an integral shoe tree or an open-cover shoe tree or two sectional shoe trees.

3. The composite last according to claim 2, wherein: the aluminum last core is provided with at least one positioning hole.

4. The composite last according to claim 2 or 3, wherein: when the shoe tree is a two-section shoe tree, the aluminum last cores of the two-section shoe tree comprise a front last body, a rear last body and a movable assembly for connecting the front last body and the rear last body, the movable assembly comprises an elastic piece, a connecting piece and a plug pin, and two ends of the connecting piece are respectively fixedly connected with the front last body and the rear last body through the plug pin; the elastic piece is bent into a hook shape, one end of the elastic piece hooks the connecting piece, and the other end of the elastic piece is fixedly connected with the back shoe last body through a bolt; the connecting piece supports the relative sliding/folding of the front last body and the back last body, and the elastic piece provides damping for the sliding/folding of the front last body and the back last body.

5. The composite last according to claim 4, wherein: the clamping piece is provided with a first shaft hole in a penetrating mode, the back shoe last body is provided with a first screw hole matched with the first shaft hole in a penetrating mode, and the front shoe last body is provided with a second screw hole matched with the first screw hole; the first shaft hole is obliquely arranged, and the inclination angle of the second screw hole, the inclination angle of the first screw hole and the inclination angle of the first shaft hole are the same; the clamping piece sequentially penetrates through the first shaft hole, the first screw hole and the second screw hole through bolts and is locked with the front shoe last body and the back shoe last body.

6. The composite last according to claim 5, wherein: the clamping piece is provided with two vertical parallel second shaft holes in a penetrating mode on two sides of the first shaft hole.

7. The composite last according to claim 5, wherein: dovetail grooves are formed in two side faces of the top of the clamping piece.

8. The preparation method of the composite shoe tree is characterized by comprising the following steps:

preparing an aluminum last core: heating and melting aluminum or aluminum alloy into aluminum liquid, pouring the aluminum liquid into an inner core die of a die casting machine, solidifying the aluminum liquid in the die in a water cooling mode, and then demolding to obtain an aluminum last core;

injection molding: adding a plastic material into an injection molding machine for heating and dissolving, and placing the aluminum last core into a mold of the injection molding machine for injection molding and wrapping;

cooling and shaping: cooling the injection-molded mold to shape the plastic in the mold, and performing secondary cooling after demolding the shaped shoe tree to obtain a shoe tree rough blank;

finish machining: and assembling the clamping piece and the shoe tree rough blank, installing the shoe tree rough blank on a shoe tree carving machine through the clamping piece, and performing cutting finish machining on the plastic on the outer surface of the shoe tree rough blank to obtain the composite shoe tree.

9. The method of manufacturing a composite last according to claim 8, wherein: the prepared aluminum last core is two sections of last, and the two sections of last are assembled before injection molding.

10. The method of making a composite last according to claim 9, wherein: and after cutting and fine processing the plastic on the outer surface of the shoe tree rough blank, cutting the plastic on the outer surface of the shoe tree rough blank according to the boundary line of the two last blocks to finally obtain the composite two last blocks.

Technical Field

The invention relates to the technical field of shoemaking, in particular to a composite shoe tree and a preparation method thereof.

Background

The shoe tree is the parent body of the shoe and is the forming mould of the shoe. The shoe tree not only determines the shape and style of the shoe, but also determines whether the shoe fits the foot or not, and can play a role in protecting the foot. At present, the shoe tree is manufactured by machining, the strength is stable and the shoe tree can be repeatedly used, but at present, the specific shoe tree is specified for one shoe size and one shoe type, the precision requirement of the shoe tree is high, the product with higher requirement on the shoe type has higher requirement on the precision and the appearance of the shoe tree, the machining precision and the processing difficulty are higher, the cost is higher, but the aesthetic trend of people changes greatly, the updating of the shoe tree is also fast, the updating of a large number of shoe trees is caused, and the cost is increased.

Most shoe lasts are formed by plastic injection molding, the recycling process is complex, and the cost is high; in addition, the shoe tree is at the in-process of moulding plastics, with preceding shoe tree with carry out small removal and break away from the in-process with the shoe tree, the metal part of manipulator can with shoe tree direct contact, so can cause the damage to the shoe tree.

Disclosure of Invention

In order to solve the problems, the invention provides the composite shoe tree and the preparation method thereof, which improve the repeated utilization rate of the shoe tree and have lower cost.

In order to achieve the purpose, the technical scheme adopted by the invention is that the composite shoe tree comprises a shoe tree and a clamping piece, wherein the shoe tree comprises an aluminum shoe tree core and a plastic shoe tree shell; the plastic last shell wraps all areas of the aluminum last core except the upper end face through injection molding; the clamping piece is detachably arranged on the upper end surface of the aluminum last core.

Preferably, the shoe last is a one-piece last, a cover-opened last or a two-section last.

Preferably, the aluminum last core is provided with at least one positioning hole.

As a preferable scheme, when the shoe tree is a two-section shoe tree, the aluminum last cores of the two-section shoe tree comprise a front last body, a back last body and a movable assembly for connecting the front last body and the back last body, the movable assembly comprises an elastic part, a connecting plate and a plug pin, and two ends of the connecting plate are fixedly connected with the front last body and the back last body respectively through the plug pin; the elastic piece is bent into a hook shape, one end of the elastic piece hooks the connecting piece, and the other end of the elastic piece is fixedly connected with the back shoe last body through a bolt; the connecting piece supports the relative sliding/folding of the front last body and the back last body, and the elastic piece provides damping for the sliding/folding of the front last body and the back last body.

As a preferable scheme, the clamping piece is provided with a first shaft hole in a penetrating manner, the back mold body is provided with a first screw hole matched with the first shaft hole in a penetrating manner, and the front mold body is provided with a second screw hole matched with the first screw hole; the first shaft hole is obliquely arranged, and the inclination angle of the second screw hole, the inclination angle of the first screw hole and the inclination angle of the first shaft hole are the same; the clamping piece sequentially penetrates through the first shaft hole, the first screw hole and the second screw hole through bolts and is locked with the front shoe last body and the back shoe last body.

Preferably, two second shaft holes which are vertically parallel are arranged on the clamping piece in a penetrating mode on two sides of the first shaft hole.

Preferably, the two side surfaces of the top of the clamping piece are provided with dovetail grooves.

In order to obtain the composite shoe tree in the technical scheme, the invention also provides a preparation method of the composite shoe tree, which comprises the following steps:

preparing an aluminum last core: heating and melting aluminum or aluminum alloy into aluminum liquid, pouring the aluminum liquid into an inner core die of a die casting machine, solidifying the aluminum liquid in the die in a water cooling mode, and then demolding to obtain an aluminum last core;

injection molding: adding a plastic material into an injection molding machine for heating and dissolving, and placing the aluminum last core into a mold of the injection molding machine for injection molding and wrapping;

cooling and shaping: cooling the injection-molded mold to shape the plastic in the mold, and performing secondary cooling after demolding the shaped shoe tree to obtain a shoe tree rough blank;

finish machining: and assembling the clamping piece and the shoe tree rough blank, installing the shoe tree rough blank on a shoe tree carving machine through the clamping piece, and performing cutting finish machining on the plastic on the outer surface of the shoe tree rough blank to obtain the composite shoe tree.

As a preferred scheme, the aluminum last core is prepared into two sections of lasts, and the two sections of lasts are assembled before injection molding.

As a preferable scheme, after the plastic on the outer surface of the shoe tree rough blank is cut and finished, the plastic on the outer surface of the shoe tree rough blank is cut according to the boundary line of the two last sections, and finally the composite two last sections are obtained.

The invention has the beneficial effects that:

according to the invention, the shoe tree is designed into a composite structure with an inner layer and an outer layer, and the plastic last shell is wrapped outside the aluminum last core, so that the aluminum last core is not easy to damage and can be recycled; the plastic last shell can be processed into shoe trees with different sizes, and the last core can be detached in a hot melting mode, so that the utilization cost is low, and the steps are simple; the upper end surface of the last core is detachably connected with the clamping piece, the shoe tree can be better fixed on the apparatus through the clamping piece, and the clamping piece is arranged on the aluminum last core and is not a plastic last shell, so that the shoe tree cannot be damaged.

Drawings

Fig. 1 is a schematic structural view of a first embodiment of the composite footwear last of the present invention.

Fig. 2 is a cross-sectional view of the composite footwear last of fig. 1.

Fig. 3 is a structural view illustrating a second embodiment of the composite footwear last according to the present invention.

Fig. 4 is a cross-sectional view of the composite last of fig. 3 taken along the movable assembly.

Fig. 5 is a schematic cross-sectional view of the composite shoe tree of fig. 3 taken along the bolt.

Fig. 6 is a structural view illustrating a third embodiment of the composite footwear last according to the present invention.

The reference numbers illustrate: 10. 10a, 10 b-an aluminum last core; 11-a front last; 12-back shoe tree; 13. 13 a-a locating hole; 14-an elastic member; 15-connecting sheets; 16-a latch; 17-a second screw hole; 20. 20a, 20 b-plastic last shell; 30. 30 a-bolt; 40. 40a, 40 b-a clamp; 41-dovetail groove; 42. 42a, 42 b-first shaft hole; 43. 43 b-second axial bore.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention relates to a composite shoe tree, which comprises a shoe tree and a clamping piece, wherein the shoe tree comprises an aluminum shoe tree core and a plastic shoe tree shell; the plastic last shell wraps all areas of the aluminum last core except the upper end face through injection molding; the clamping piece is detachably arranged on the upper end surface of the aluminum last core.

In order to obtain the composite shoe tree, the invention also adopts the technical scheme that the preparation method of the composite shoe tree comprises the following steps:

preparing an aluminum last core: heating and melting aluminum or aluminum alloy into aluminum liquid, pouring the aluminum liquid into an inner core die of a die casting machine, solidifying the aluminum liquid in the die in a water cooling mode, and then demolding to obtain an aluminum last core;

injection molding: adding a plastic material into an injection molding machine for heating and dissolving, and placing the aluminum last core into a mold of the injection molding machine for injection molding and wrapping;

cooling and shaping: cooling the injection-molded mold to shape the plastic in the mold, and performing secondary cooling after demolding the shaped shoe tree to obtain a shoe tree rough blank;

finish machining: and assembling the clamping piece and the shoe tree rough blank, installing the shoe tree rough blank on a shoe tree carving machine through the clamping piece, and performing cutting finish machining on the plastic on the outer surface of the shoe tree rough blank to obtain the composite shoe tree.

According to the invention, the shoe tree is designed into a composite structure with an inner layer and an outer layer, and the plastic last shell is wrapped outside the aluminum last core, so that the aluminum last core is not easy to damage and can be recycled; the plastic last shell can be processed into shoe trees with different sizes, and the aluminum last core can be detached in a hot melting mode, so that the utilization cost is low, and the steps are simple; the upper end surface of the aluminum last core is detachably connected with the clamping piece, the shoe tree can be better fixed on the apparatus through the clamping piece, and the clamping piece is arranged on the aluminum last core and is not a plastic last shell, so that the shoe tree cannot be damaged.

In the present invention, the footwear last is a one-piece last or a cover-opened last or two-piece last, and the outer structures of the one-piece last and the two-piece last look almost the same, and the detailed description is mainly given of the inner structures of the one-piece last and the two-piece last.

The embodiments of the present invention will be described in detail with reference to the following examples and accompanying drawings, which should not be construed as limiting the scope of the present invention.

Referring to fig. 1 and 2, a first embodiment of the composite footwear last of the present invention is a one-piece last including an aluminum last core 10, a plastic last shell 20, and a clamping member 40; the aluminum last core 10 is provided with at least one positioning hole 13, the plastic last shell 20 wraps all areas of the aluminum last core 10 except the upper end face through injection molding, and when the aluminum last core 10 is placed into an injection molding machine, the plastic last shell is fixed with an injection mold through the positioning hole 13, so that the precise injection molding of the plastic last shell 20 and the aluminum last core 10 is realized; the clamping member 40 is detachably installed on the upper end surface of the aluminum last core 10, at least one first shaft hole 42 is formed in the clamping member 40 in a penetrating manner, the first shaft hole 42 is vertically arranged, and the bolt 30 is only required to penetrate through the first shaft hole 42 to be connected with the aluminum last core 10, so that the clamping member 40 is locked with the aluminum last core 10. This connection saves both the cost of manufacture of the clamp 40 and the ease of installation.

Furthermore, dovetail grooves 41 are formed in two side faces of the top of the clamping piece 40, machine equipment clamps and fixes the clamping piece 40 through the dovetail grooves 41, and therefore fixing of the shoe tree is achieved, damage to the shoe tree in the moving or clamping process can be reduced through the indirect clamping mode, the manipulator of the shoe tree carving machine can clamp two sides of the clamping piece 40, and the dovetail grooves 41 are clamped with the clamping piece more firmly.

The preparation method of the composite shoe tree in this embodiment includes the following steps:

preparing an aluminum last core: heating aluminum or aluminum alloy to 650-700 ℃ to melt the aluminum or aluminum alloy into molten aluminum, pouring the molten aluminum into an inner core die of a die casting machine, solidifying the molten aluminum in the die for 60 seconds in a water cooling mode, and then demolding to obtain an aluminum last core;

injection molding: firstly, preheating an injection molding machine, adding a plastic material PE into the injection molding machine, and heating and dissolving for 2 hours; placing the aluminum last core into a mold of an injection molding machine, and performing injection molding and wrapping when the temperature of a mold head reaches 180-200 ℃;

cooling and shaping: cooling the injection-molded mold with cold water for 2 minutes to shape the plastic in the mold, and placing the shaped shoe tree into cold water or warm water for secondary cooling after demolding to obtain a shoe tree rough blank;

finish machining: and assembling the clamping piece and the shoe tree rough blank, installing the shoe tree rough blank on a shoe tree carving machine through the clamping piece, and performing cutting finish machining on the plastic on the outer surface of the shoe tree rough blank to obtain the composite shoe tree.

As shown in fig. 3 and 4, a second embodiment of the composite shoe last of the present invention is a two-section shoe last, which includes an aluminum last core 10a, a plastic last shell 20a and a clamping member 40a, wherein the aluminum last core 10a includes a front last body 11, a back last body 12, and a movable assembly connecting the front last body 11 and the back last body 12, the movable assembly includes an elastic member 14, a connecting piece 15 and a plug 16, and two ends of the connecting piece 15 are fixedly connected to the front last body 11 and the back last body 12 respectively through the plug 16; the elastic piece 14 is bent into a hook shape, one end of the elastic piece 14 hooks the connecting piece 15, and the other end is fixedly connected with the back shoe last body 12 through a bolt 16; the connecting links 15 support the relative sliding/folding of the front mold 11 and the back mold 12, and the elastic members 14 provide damping of the sliding/folding of the front mold 11 and the back mold 12.

In addition, the rear portion of the front mold 11 and the front portion of the back mold 12 have a cross section that is matched with each other, and the cross section is stepped. The front last body 11 and the back last body 12 can be effectively prevented from being vertically staggered by limiting through the stepped section, and the front last body 11 and the back last body 12 can be matched for quick assembly and positioning, so that the shoe making efficiency is improved. The front last body 11 and the back last body 12 are respectively provided with at least one positioning hole 13a, and the plastic last shell 20a wraps the front last body 11 and the back last body 12 in an injection molding mode.

A first shaft hole 42a penetrates through the inside of the clamping piece 40a, a first screw hole matched with the first shaft hole 42a penetrates through the back mold 12, and a second screw hole 17 matched with the first screw hole is formed in the front mold 11; the first shaft hole 42a is obliquely arranged, and the inclination angle of the second screw hole 17, the inclination angle of the first screw hole and the inclination angle of the first shaft hole 42a are the same; the bolt 30 passes through the first shaft hole 42, the first screw hole and the second screw hole 17 in order to lock the clamping member 40a, the front mold 11 and the back mold 12.

The clamping piece 40a does not need to be divided into two parts because the shoe tree is of a two-section structure, only the first screw hole and the second screw hole 17 which are communicated with each other need to be formed in the front shoe tree 11 and the back shoe tree 12, and only the bolt 30 needs to sequentially penetrate through the first shaft hole 42, the first screw hole and the second screw hole 17 to lock the clamping piece 40a, the front shoe tree 11 and the back shoe tree 12. This connection saves both the cost of manufacturing the clamp 40a and the ease of installation. Further, the clamping piece 40a is provided with two vertically parallel second shaft holes 43 penetrating through two sides of the first shaft hole 42a, and the machine equipment is connected with the clamping piece 40a through the second shaft holes 43; and further, the shoe tree is fixed, and the damage to the shoe tree in the moving or clamping process can be reduced by the indirect clamping mode.

The preparation method of the composite shoe tree in this embodiment includes the following steps:

preparing an aluminum last core: heating aluminum or aluminum alloy to 650-700 ℃ to melt the aluminum or aluminum alloy into molten aluminum, pouring the molten aluminum into an inner core die of a die casting machine, solidifying the molten aluminum in the die for 60 seconds in a water cooling mode, and then demolding to obtain a front last body and a back last body; assembling the front last body and the back last body through a movable assembly to obtain an aluminum last core;

injection molding: firstly, preheating an injection molding machine, adding a plastic material PE into the injection molding machine, and heating and dissolving for 2 hours; placing the aluminum last core into a mold of an injection molding machine, and performing injection molding and wrapping when the temperature of a mold head reaches 180-200 ℃;

cooling and shaping: cooling the injection-molded mold with cold water for 2 minutes to shape the plastic in the mold, and placing the shaped shoe tree into cold water or warm water for secondary cooling after demolding to obtain a shoe tree rough blank;

finish machining: and assembling the clamping piece and the shoe tree rough blank, installing the shoe tree rough blank on a shoe tree carving machine through the clamping piece, and performing cutting finish machining on the plastic on the outer surface of the shoe tree rough blank to obtain the processed shoe tree.

Cutting: and cutting the plastic on the outer surface of the processed shoe tree according to the boundary line of the front shoe tree body and the back shoe tree body to obtain the composite shoe tree.

As shown in FIG. 6, which is a third embodiment of the composite footwear last of the present invention, the footwear last is an integrated last, and includes an aluminum last core 10b, a plastic last shell 20b, a fastening member, and a clamping member 40 b; the aluminum last core 10b has an upper end surface, the plastic last shell 20b is wrapped around the aluminum last core 10b except for the upper end surface, and the clamping member 40b is detachably mounted on the upper end surface of the aluminum last core 10b by a fastening member.

Unlike the first embodiment, the clamping member 40b of the third embodiment is not provided with a dovetail groove, but the clamping member 40b is provided with a first shaft hole 42b and a second shaft hole 43b, and a bolt is simply inserted through the first shaft hole 42b to connect with the aluminum last core 10b, thereby locking the clamping member 40b with the aluminum last core 10 b. The connecting mode not only saves the manufacturing cost of the clamping piece 40b, but also is convenient to install; the machine is connected to the clamp 40b through the second shaft hole 43 b; and further, the shoe tree is fixed, and the damage to the shoe tree in the moving or clamping process can be reduced by the indirect clamping mode.

In a fourth embodiment of the composite last of the present invention, the last is a two-section last comprising an aluminum last core, a plastic last shell, a fastener, and a clamping member; the aluminum last core is provided with an upper end face, the plastic last shell wraps the aluminum last core except the upper end face, and the clamping piece is detachably mounted on the upper end face of the aluminum last core through a fastening piece.

Different from the second embodiment, the second shaft hole is not formed in the clamping piece of the fourth embodiment, the dovetail grooves are formed in the two side faces of the top end of the clamping piece, the machine equipment clamps and fixes the clamping piece through the dovetail grooves, and therefore fixing of the shoe tree is achieved, and damage to the shoe tree in the moving or clamping process can be reduced through the indirect clamping mode.

In the above embodiments, the aluminum last core may be made of aluminum alloy or other light metal, in addition to aluminum; the bolt used for connecting and fastening can also be replaced by a screw or a rivet, and the bolt penetrates through the clamping piece and then is in threaded connection with the aluminum last core, so that the details are not repeated.

The above embodiments are merely illustrative of the preferred embodiments of the present invention, and not restrictive, and various changes and modifications to the technical solutions of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are intended to fall within the scope of the present invention defined by the appended claims.