Mobile phone rear shell in-mold punching die

Abstract

The utility model relates to the technical field of punching dies, in particular to an in-die punching die for a rear shell of a mobile phone. Comprising a lower die base and an upper die base, a lower die core is fixedly mounted at the top of the lower die base, a first punching avoiding cavity is formed in the top of the lower die core, and a first clamping convex part is arranged in the first punching avoiding cavity; the upper die base is installed on the top of the lower die base in an up-down moving mode, and an upper die core is fixedly installed at the bottom of the upper die base and provided with a cutting part. A second clamping convex part is mounted at the bottom of the upper mold core in an up-down moving manner; the cutting part is positioned on the outer side of the second clamping convex part; and after the upper mold core and the lower mold core are opened, the bottom of the second clamping convex part is lower than the bottom of the cutting part. Compared with the prior art, the mobile phone rear shell can be clamped and positioned through the first clamping convex part and the second clamping convex part, and a positioning jig does not need to be additionally arranged for positioning the mobile phone rear shell, so that the overall structure of the in-mold punching mold is simplified, and the manufacturing cost of the in-mold punching mold is reduced; and the punching efficiency of the rear shell of the mobile phone can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of blanking dies, in particular to an in-mold blanking die for a mobile phone back shell. Background Technique

[0002] In the field of automation, the die-cutting process is involved. The die-cutting process is used to cut the edges of product films. Existing die-cutting equipment generally adopts a structure similar to the stamping process, that is, the upper and lower dies cooperate with each other to cut the edges of the product film placed between the upper and lower dies.

[0003] During the die-cutting process, in order to ensure the die-cutting quality, the product needs to be positioned and fixed first. Existing die-cutting equipment needs to be equipped with a positioning fixture on the lower die base. The positioning fixture needs to be separately equipped with a power output component, such as a cylinder and other driving components, to drive the clamping block to clamp and fix the product in multiple directions; such a structure results in a complex structure of the blanking die and a high manufacturing cost.

[0004] Therefore, it is necessary to study a new technical solution to solve the above problems. Content of the Utility Model

[0005] In view of this, in view of the deficiencies of the existing technology, the main purpose of the present utility model is to provide an in-mold blanking die for a mobile phone back shell, which effectively solves the technical problem of the complex structure of the in-mold blanking die for punching the mobile phone back shell in the existing technology.

[0006] To achieve the above purpose, the present utility model adopts the following technical solution: An in-mold blanking die for a mobile phone back shell, including a lower die base and an upper die base; a lower die core is fixedly installed on the top of the lower die base; a first punching avoidance cavity is provided on the top of the lower die core, and a first clamping convex part is provided in the first punching avoidance cavity; the upper die base is movably installed up and down on the top of the lower die base; an upper die core is fixedly installed at the bottom of the upper die base, and a material cutting part is provided on the upper die core; a second clamping convex part is movably installed up and down at the bottom of the upper die core, and the material cutting part is located outside the second clamping convex part; after the upper die core and the lower die core are opened, the bottom of the second clamping convex part is lower than the bottom of the material cutting part.

[0007] The beneficial effect of the in-mold blanking die for a mobile phone back shell provided by the present application is as follows: During operation, first drive the upper die base to move a first stroke relative to the lower die base, so that the first clamping convex part and the second clamping convex part jointly clamp the mobile phone back shell; then continue to drive the upper die base to move a second stroke relative to the lower die base, so that the material cutting part moves downward relative to the second clamping convex part, and the sprue material at the edge of the mobile phone back shell can be punched and dropped into the first punching avoidance cavity;

[0008] Compared with the prior art, the clamping and positioning of the mobile phone back shell can be completed by setting the first clamping protrusion and the second clamping protrusion, and there is no need to set an additional positioning fixture to position the mobile phone back shell, thereby simplifying the overall structure of the in-mold punching mold and reducing the manufacturing cost of the in-mold punching mold; at the same time, by controlling the upper mold base to perform the first stroke displacement and the second stroke displacement, the clamping and positioning of the mobile phone back shell and the punching of the sprue material can be completed. The positioning and punching processes are simple, which is beneficial to improving the punching efficiency of the mobile phone back shell.

[0009] As a preferred solution: the upper mold core is provided with a first limiting chamber, and a first limiting window connected to the first limiting chamber is provided at the bottom of the upper mold core; the second clamping protrusion is movably installed in the first limiting window, and the top of the second clamping protrusion is provided with a second limiting portion movable in the first limiting chamber.

[0010] As a preferred solution: a plurality of first elastic rubber blocks are installed in the first limiting chamber, one end of each first elastic rubber block abuts against the top of the first limiting chamber, and the other end abuts against the top of the second limiting portion.

[0011] As a preferred solution: the upper die seat is provided with a plurality of first through holes, each first through hole is installed with a first stroke limit rod, and a first elastic rubber block is sleeved on a first stroke limit rod.

[0012] As a preferred solution: the outer side surface of the first clamping protrusion is flush with the outer side surface of the second clamping protrusion, the side surface of the cutting portion facing the first limiting window is flush with the side surface of the first limiting window, and the side surface of the cutting portion facing away from the first limiting window is provided with a first effective inclined surface, and the first effective inclined surface is inclined from bottom to top and outward.

[0013] As a preferred solution: the lower mold core is provided with a plurality of first positioning rods, which are arranged in a square array and protrude from the top of the lower mold core; and a first positioning hole for inserting the first positioning rod is provided at the bottom of the upper mold core.

[0014] As a preferred solution: the first clamping protrusion is provided with a first protrusion, and the first protrusion is used to adapt to the camera recess of the rear shell of the mobile phone; the second clamping protrusion is provided with a first avoidance recess adapted to the first protrusion.

[0015] As a preferred solution: also include

[0016] The first punch is movably mounted on the lower die seat; the lower die core is provided with a first mounting hole for inserting the first punch, and the first mounting hole passes through the bottom of the lower die core and the top of the first protrusion; the first punch can extend upward through the first mounting hole, and when the upper die core and the lower die core are not molded, the top of the first punch is flush with the top of the first protrusion;

[0017] The second punch is fixedly installed on the upper die base; the second clamping convex part is provided with a second installation hole for the second punch to be inserted, and the second installation hole penetrates through the top of the second clamping convex part and the top of the first avoidance concave part; the second punch can extend downward through the second installation hole; when the upper die core and the lower die core are not closed, the bottom of the second punch is flush with the top of the first avoidance concave part.

[0018] As a preferred solution: there are two first punches, and the two first punches are movably installed on the lower die base up and down through the first movable plate;

[0019] The number of the second punches is the same as that of the first punches. One first punch and one second punch are arranged at an upper and lower interval and coaxially. The two second punches are fixedly installed on the upper die base through the first substrate.

[0020] As a preferred solution: the lower die base is provided with a first concave cavity, and the first movable plate is movably installed in the first concave cavity up and down;

[0021] The first concave cavity is provided with a second elastic rubber block. One end of the second elastic rubber block abuts against the bottom of the first concave cavity, and the other end abuts against the bottom of the first movable plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 is a three-dimensional structural schematic diagram of the in-mold punching die for the mobile phone back shell provided by the embodiment of the present application;

[0024] Figure 2 is Figure 1 the exploded view of the in-mold punching die for the mobile phone back shell shown;

[0025] Figure 3 is Figure 1 the partial structural exploded view of the upper die base and the second clamping convex part of the in-mold punching die for the mobile phone back shell shown;

[0026] Figure 4 is Figure 1 the top view of the in-mold punching die for the mobile phone back shell shown;

[0027] Figure 5 is Figure 4 the sectional view taken along the line A-A of the in-mold punching die for the mobile phone back shell shown;

[0028] Figure 6 is Figure 5Partial enlarged view at location A of the in-mold punching die for the mobile phone back cover shown;

[0029] Figure 7 is Figure 4 Cross-sectional view taken along line B-B of the in-mold punching die for the mobile phone back cover shown;

[0030] Figure 8 is Figure 7 Partial enlarged view at location A of the in-mold punching die for the mobile phone back cover shown.

[0031] Among them, the reference numerals in the figures are as follows:

[0032] 10. Lower die base; 11. Lower die core; 111. First avoidance cavity; 112. First clamping convex part; 1121. First protrusion; 113. First positioning rod; 114. First mounting hole; 12. First punch; 121. First movable plate; 13. First concave cavity; 14. Second elastic rubber block; 15. Spacer block; 151. First positioning notch;

[0033] 20. Upper die base; 21. Upper die core; 211. Cutting part; 2111. First acting inclined plane; 212. Second clamping convex part; 2121. Second limiting part; 2122. First avoidance concave part; 2123. Second mounting hole;

[0034] 213. First limiting cavity; 214. First limiting window; 215. First elastic rubber block; 216. First positioning hole; 22. First through hole; 221. First stroke limiting rod; 23. Second punch; 231. First substrate;

[0035] 30. Mobile phone back cover; 31. Sprue; 32. Camera recess; 33. Camera through hole. Detailed implementation manners

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0038] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present application.

[0039] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0040] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the drawings and embodiments.

[0041] Please refer to Figures 1 to 8 together, and now the in-mold punching die for the mobile phone back cover provided by the embodiment of the present application will be described. The in-mold punching die for the mobile phone back cover 30 includes: a lower die base 10 and an upper die base 20.

[0042] A lower die insert 11 is fixedly installed on the top of the lower die base 10. A first punching avoidance cavity 111 is provided on the top of the lower die insert 11, and a first clamping protrusion 112 is provided in the first punching avoidance cavity 111; the upper die base 20 is movably installed up and down on the top of the lower die base 10; an upper die insert 21 is fixedly installed on the bottom of the upper die base 20, and a material cutting part 211 is provided on the upper die insert 21; a second clamping protrusion 212 is movably installed up and down on the bottom of the upper die insert 21, and the material cutting part 211 is located outside the second clamping protrusion 212; after the upper die insert 21 and the lower die insert 11 are opened, the bottom of the second clamping protrusion 212 is lower than the bottom of the material cutting part 211.

[0043] During operation, first drive the upper die holder 20 to move a first stroke relative to the lower die holder 10, so that the first clamping protrusion 112 and the second clamping protrusion 212 jointly clamp the mobile phone back shell 30; then continue to drive the upper die holder 20 to move a second stroke relative to the lower die holder 10, so that the blanking part 211 moves downward relative to the second clamping protrusion 212, and the sprue 31 at the edge of the mobile phone back shell 30 can be punched and dropped into the first punching avoidance cavity. Compared with the prior art, the clamping and positioning of the mobile phone back shell 30 can be completed directly through the provided first clamping protrusion 112 and the second clamping protrusion 212, without additionally setting a positioning fixture to position the mobile phone back shell 30, thereby simplifying the overall structure of the in-mold punching die and reducing the manufacturing cost of the in-mold punching die; at the same time, by controlling the first stroke displacement and the second stroke displacement of the upper die holder 20, the clamping and positioning of the mobile phone back shell 30 and the punching of the sprue 31 can be completed. The processes of positioning and punching are simple, which is beneficial to improving the punching efficiency of the mobile phone back shell 30.

[0044] In some embodiments of the present application, the upper die core 21 is provided with a first limiting chamber 213, the first limiting chamber 213 penetrates through the top of the upper die core 21, and a first limiting window 214 communicating with the first limiting chamber 213 is provided at the bottom of the upper die core 21; the second clamping protrusion 212 is movably installed in the first limiting window 214, and a second limiting portion 2121 that can move in the first limiting chamber 213 is provided at the top of the second clamping protrusion 212. A plurality of first elastic rubber blocks 215 are installed in the first limiting chamber 213, one end of each first elastic rubber block 215 abuts against the top of the first limiting chamber 213, and the other end abuts against the top of the second limiting portion 2121.

[0045] It can be understood that when the upper die holder 20 moves downward a first stroke relative to one side of the lower die holder 10, the first clamping protrusion 112 and the second clamping protrusion 212 can clamp the back shell at the same time; then during the process of continuing to move the upper die holder 20 relative to one side of the lower die holder 10 by a second stroke, the second clamping protrusion 212 moves upward in the first limiting window, so that the blanking part 211 cuts the mobile phone back shell 30 clamped by the first clamping protrusion 112 and the second clamping protrusion 212, cuts the sprue 31 at the edge of the mobile phone back shell 30 from the mobile phone back shell 30 and transfers it to the first avoidance cavity, so as to facilitate the subsequent cleaning of the sprue 31.

[0046] Specifically, the upper die base 20 is provided with a plurality of first through holes 22, each of which is provided with a first travel limit rod 221, and a first elastic rubber block 215 is sleeved on a first travel limit rod 221. The lower die core 11 is provided with a plurality of first positioning rods 113, which are arranged in a square array and protrude from the top of the lower die core 11; the bottom of the upper die core 21 is provided with a first positioning hole 216 for inserting the first positioning rod 113. When the upper die base 20 is disengaged from the lower die base 10, the first elastic rubber block acts on the second clamping protrusion 212 to move downward to complete the reset. When the upper die base 20 is moved downward relative to the lower die base 10, the upper die core 21 can be molded with the lower die core 11, and at this time, the first positioning rod 113 is inserted into the first positioning hole 216 to maintain the position of the upper die core 21 and the lower die core 11 during and after the mold is molded, so that the problem of displacement is not easy to occur.

[0047] Preferably, a cushion block 15 is further included, and the cushion block 15 is installed on the upper surface of the lower die core 11. The arrangement of the cushion block 15 can change the distance of the first stroke of the upper die base 20 relative to the lower die base 10; the height of the cushion block 15 can be changed according to the different thicknesses of the mobile phone back shell 30, so as to achieve the punching of mobile phone back shells 30 of different thicknesses. In order to ensure the installation reliability of the cushion block 15, the cushion block 15 is provided with a first positioning notch 151. After the cushion block 15 is installed on the upper surface of the lower die core 11, the first positioning rod 113 can be inserted into the first positioning notch 151 to maintain the position of the cushion block 15.

[0048] In more detail, the outer side surface of the first clamping protrusion 112 is flush with the outer side surface of the second clamping protrusion 212, the side surface of the cutting portion 211 facing the first limiting window 214 is flush with the side surface of the first limiting window 214, and the side surface of the cutting portion 211 away from the first limiting window 214 is provided with a first action inclined surface 2111, and the first action inclined surface 2111 is inclined outward from bottom to top. With such a structure, after punching the mobile phone rear shell 30, the first action inclined surface 2111 is used to expand the nozzle material 31 outward, or directly break the nozzle material 31, so that the nozzle material 31 can be comfortably transferred to the first avoidance cavity, making the subsequent cleaning of the nozzle material 31 more convenient.

[0049] In some other embodiments of the present application, the first clamping protrusion 112 is provided with a first protruding portion 1121, and the first protruding portion 1121 is used to fit the camera recess 32 of the mobile phone back shell 30; the second clamping protrusion 212 is provided with a first avoiding recess 2122 adapted to the first protruding portion 1121. When loading the mobile phone back shell 30 to punch the sprue 31, the mobile phone back shell 30 is loaded onto the first clamping protrusion 112, and the first protruding portion 1121 is inserted into the camera recess 32 to complete pre-positioning; then, after the upper die base 20 moves downward by a first stroke relative to the lower die base 10, the cooperation between the first protruding portion 1121 and the first avoiding recess 2122 is used to complete the positioning and clamping of the mobile phone back shell 30, and the first clamping protrusion 112 and the second clamping protrusion 212 are used to clamp the mobile phone back shell 30, which can prevent the mobile phone back shell 30 from deforming when punching the sprue 31.

[0050] Specifically, it further includes a first punch 12 and a second punch 23. The first punch 12 is movably installed up and down on the lower die base 10; the lower die insert 11 is provided with a first installation hole 114 for the first punch 12 to insert, and the first installation hole 114 penetrates the bottom of the lower die insert 11 and the top of the first protruding portion 1121; the first punch 12 can extend upward through the first installation hole 114. When the upper die insert 21 and the lower die insert 11 are not closed, the top of the first punch 12 is flush with the top of the first protruding portion 1121; the second punch 23 is fixedly installed on the upper die base 20, and the upper die insert 21 is provided with a second installation hole 2123 for the second punch 23 to insert, and the second installation hole 2123 penetrates the top of the second clamping protrusion 212 and the top of the first avoiding recess 2122; the second punch 23 can extend downward through the second installation hole 2123; when the upper die insert 21 and the lower die insert 11 are not closed, the bottom of the second punch 23 is flush with the top of the first avoiding recess 2122.

[0051] More specifically, after the upper die base 20 moves downward by a first stroke relative to the lower die base 10, the first punch 12 abuts against the top surface of the mobile phone back shell 30, and the second punch 23 abuts against the bottom surface of the mobile phone back shell 30; when the upper die base 20 moves relative to the lower die base 10 by a second stroke, the second punch 23 continues to move downward to punch out the camera through hole 33 and at the same time acts on the first punch 12 to move downward, and the waste of the camera through hole 33 is transferred to the first punch 12; subsequently, after the upper die base 20 moves upward and opens the die relative to the lower die base 10, the second punch 23 pushes the waste of the camera through hole 33 upward from the first installation hole 114.

[0052] Further, there are two first punches 12, and the two first punches 12 can be installed on the lower die base 10 by moving up and down through the first movable plate 121; the number of the second punches 23 is the same as the number of the first punches 12, one first punch 12 and one second punch 23 are arranged coaxially with each other at a vertical distance, and the two second punches 23 are fixedly installed on the upper die base 20 through the first base plate 231. The lower die base 10 is provided with a first concave cavity 13, and the first movable plate 121 can be installed in the first concave cavity 13 by moving up and down; the first concave cavity 13 is provided with a second elastic rubber block 14, one end of the second elastic rubber block 14 abuts against the bottom of the first concave cavity 13, and the other end abuts against the bottom of the first movable plate 121; when the second punch 23 cancels the force acting on the first punch 12, the second elastic rubber block 14 can provide an elastic force for the first punch 12 to move the first punch 12 upward, so that the top of the first punch 12 is flush with the top of the first protrusion 1121.

[0053] It should be noted that between the upper die base 20 and the lower die base 10 , one is provided with a guide rod and the other is provided with a guide hole for inserting the guide rod, so as to control the upper die base 20 to move up and down only relative to the lower die base 10 .

[0054] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for the purpose of explaining the principles of the present invention, and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementation methods of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A die-cutting die for in-mold punching of a mobile phone back cover, characterized in that: include A lower die base (10) is provided with a lower die core (11) fixedly mounted on the top; a first punching avoidance cavity (111) is provided on the top of the lower die core (11), and the first punching avoidance cavity (111) is provided with a first clamping protrusion (112); An upper die seat (20) is movably mounted on the top of a lower die seat (10); an upper die core (21) is fixedly mounted on the bottom of the upper die seat (20), and the upper die core (21) is provided with a cutting portion (211); a second clamping protrusion (212) is movably mounted on the bottom of the upper die core (21), and the cutting portion (211) is located outside the second clamping protrusion (212); after the upper die core (21) and the lower die core (11) are opened, the bottom of the second clamping protrusion (212) is lower than the bottom of the cutting portion (211).

2. The in-mold punching die for the mobile phone back cover according to claim 1, wherein: The upper mold core (21) is provided with a first limiting chamber (213), and the bottom of the upper mold core (21) is provided with a first limiting window (214) communicating with the first limiting chamber (213); The second clamping protrusion (212) is movably installed in the first limiting window (214), and a second limiting portion (2121) movable in the first limiting chamber (213) is provided on the top of the second clamping protrusion (212).

3. The in-mold punching die for the mobile phone back shell according to claim 2, characterized in that: A plurality of first elastic rubber blocks (215) are installed in the first limiting chamber (213), one end of each first elastic rubber block (215) abuts against the top of the first limiting chamber (213), and the other end abuts against the top of the second limiting portion (2121).

4. The in-mold punching die for the mobile phone back cover according to claim 3, characterized in that: The upper die seat (20) is provided with a plurality of first through holes (22), each of the first through holes (22) is provided with a first travel limit rod (221), and a first elastic rubber block (215) is sleeved on a first travel limit rod (221).

5. The in-mold punching die for the mobile phone back cover according to any one of claims 2-4, characterized in that: The outer side surface of the first clamping protrusion (112) is arranged flush with the outer side surface of the second clamping protrusion (212); the side surface of the cutting portion (211) facing the first limiting window (214) is arranged flush with the side surface of the first limiting window (214); the side surface of the cutting portion (211) facing away from the first limiting window (214) is provided with a first effective inclined surface (2111); and the first effective inclined surface (2111) is arranged to be inclined from bottom to top and outward.

6. The in-mold punching die for the mobile phone back cover according to claim 1, wherein: The lower mold core (11) is provided with a plurality of first positioning rods (113), and the plurality of first positioning rods (113) are arranged in a square array and protrude from the top of the lower mold core (11); The bottom of the upper mold core (21) is provided with a first positioning hole (216) for inserting the first positioning rod (113).

7. The in-mold punching die for the mobile phone back shell according to any one of claims 1-4, characterized in that: The first clamping protrusion (112) is provided with a first protrusion (1121), and the first protrusion (1121) is used to fit the camera recess of the rear shell of the mobile phone; The second clamping protrusion (212) is provided with a first avoidance recess (2122) adapted to the first protrusion (1121).

8. The in-mold punching die for the mobile phone back cover according to claim 7, characterized in that: Also includes The first punch (12) is movably mounted up and down on the lower die base (10); the lower die insert (11) is provided with a first mounting hole (114) for the first punch (12) to insert, and the first mounting hole (114) penetrates through the bottom of the lower die insert and the top of the first convex portion (1121); the first punch (12) can extend upward through the first mounting hole (114), and when the upper die insert (21) and the lower die insert (11) are not closed, the top of the first punch (12) is flush with the top of the first convex portion (1121). The second punch (23) is fixedly mounted on the upper die base (20); the second clamping convex portion (212) is provided with a second mounting hole (2123) for the second punch (23) to insert, and the second mounting hole (2123) penetrates through the top of the second clamping convex portion (212) and the top of the first avoidance concave portion (2122); the second punch (23) can extend downward through the second mounting hole (2123); when the upper die insert (21) and the lower die insert (11) are not closed, the bottom of the second punch (23) is flush with the top of the first avoidance concave portion (2122).

9. The in-mold punching die for the mobile phone back shell according to claim 8, wherein: There are two first punches (12), and the two first punches (12) are movably mounted up and down on the lower die base (10) through a first movable plate (121). The number of the second punches (23) is the same as that of the first punches (12), one first punch (12) and one second punch (23) are arranged coaxially with a vertical distance therebetween, and the two second punches (23) are fixedly mounted on the upper die base (20) through a first substrate (231).

10. The in-mold punching die for the mobile phone back cover according to claim 9, wherein: The lower die base (10) is provided with a first cavity (13), and the first movable plate (121) is movably mounted up and down in the first cavity (13). The first cavity (13) is provided with a second elastic rubber block (14), one end of the second elastic rubber block (14) abuts against the bottom of the first cavity (13), and the other end abuts against the bottom of the first movable plate (121).

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