A hot pressing forming die with a spring-loaded structure

Abstract

A hot pressing forming die with a spring-loaded structure relates to the technical field of die devices, and includes an upper template, a middle plate, and a lower template arranged in sequence from top to bottom. A hanging spring assembly is provided on the upper template. When the upper template moves downward, the hanging spring assembly first contacts and abuts against the middle plate. A limiting block flush with the upper surface of the middle plate is also provided on the lower template. The present invention solves the problems in the traditional device that during the mold closing of a three-layer hot pressing forming die, the raw material is often pressed between the lower template and the middle plate, resulting in glue overflow; and there is a problem that the upper template adheres to the middle plate, and the middle plate is prone to falling during the upward movement with the upper template, causing damage to the die, and there is also a problem of damaging the upper template and the lower template after mold closing.

Description

Technical Field

[0001] The present invention relates to the technical field of die devices, and particularly relates to a hot pressing forming die with an ejector structure. Background Art

[0002] An injection mold is a tool for producing plastic products; it is also a tool for giving plastic products a complete structure and precise dimensions. Injection molds are classified into transfer molds, blow molds, casting molds, thermoforming molds, hot pressing molds, injection molds, etc. according to the forming process. Among them, injection molds can be further divided into cold runner molds and hot runner molds according to the pouring process.

[0003] Hot pressing forming is a simple and common processing method in the plastic processing industry. It mainly involves heating the processing mold, injecting the test material, fixing the mold on the heating plate with pressure, controlling the melting temperature and time of the test material to achieve hardening and cooling after melting, and then taking out the mold finished product. Hot pressing forming can sometimes be divided into vacuum forming and compression forming, and their pressure application methods are different.

[0004] A patent of CN207256675U is disclosed in the prior art. The solution includes a moving die structure, a female die template, a female die fixing plate, a cavity plate, a cavity, a cavity groove, a retaining pin, a guide sleeve opening, a guide sleeve tube, and an internal hexagonal screw. The top of the female die template is attached to the bottom of the female die fixing plate, the top of the female die fixing plate is fixedly connected to the bottom of the cavity plate through an internal hexagonal screw, the top of the female die template is welded to the bottom of the guide sleeve tube, the guide sleeve tube is perpendicular to the top of the female die template, the guide sleeve opening is communicated with the inner wall of the guide sleeve tube, the retaining pin is parallel to the guide sleeve tube, the top of the cavity plate is provided with a cavity, the edge of the cavity groove and the inside of the cavity are an integrated structure, the bottom of the retaining pin is welded to the four corners of the top of the cavity plate, and the guide sleeve opening is connected to the moving die structure. The present invention is an environmentally friendly rubber hot pressing forming die, which is provided with a core on the structure, uses S136H die steel as the raw material, and cooperates with the cavity for opening and closing compression forming, which will not cause chemical effects on the formed product and is safe and environmentally friendly.

[0005] However, during the production and use of this device, the deficiencies of this technology have gradually emerged, mainly manifested in the following aspects:

[0006] First, when the existing three-layer hot pressing forming die is closed, the raw material is often pressed between the lower template and the middle plate, resulting in the problem of glue overflow.

[0007] Second, when the existing three-layer hot pressing forming die is closed, there is a problem that the upper template adheres to the middle plate, and the middle plate is easy to fall off during the rising process with the upper template, resulting in damage to the die; there is also a problem that the middle plate is forgotten to be placed, and the upper template and the lower template are damaged after the die is closed.

[0008] In summary, it is obvious that the prior art has inconveniences and defects in actual use, so it is necessary to be improved. Summary of the Invention

[0009] In view of the defects in the prior art, the present invention provides a hot pressing mold with a spring-loaded structure to solve the problems of the device in the traditional technology. When the three-layer hot pressing mold is closed, the raw material is often pressed between the lower template and the middle plate, resulting in glue overflow; and there is a problem that the upper template adheres to the middle plate, and the middle plate is easy to fall off during the rising process with the upper template, causing damage to the mold, and there is also a problem of damaging the upper template and the lower template after the mold is closed.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A hot pressing mold with a spring-loaded structure includes an upper template, a middle plate, and a lower template arranged in sequence from top to bottom. A hanging spring assembly is provided on the upper template. When the upper template moves downward, the hanging spring assembly first contacts and abuts against the middle plate. A limiting block flush with the upper surface of the middle plate is also provided on the lower template.

[0012] As an optimized solution, a large guide post extending downward is fixedly connected to the upper template, and a guide sleeve matching the large guide post is provided on the lower template.

[0013] As an optimized solution, a small guide post penetrating upward through the middle plate is also fixedly connected to the lower template, and a guide hole matching the small guide post is provided on the upper template.

[0014] As an optimized solution, the hanging spring assembly includes a hanging platform and a spiral spring fixed to the lower end of the hanging platform.

[0015] As an optimized solution, a first installation hole is opened on the upper template. A first stepped hole is provided at the upper port of the first installation hole. The hanging platform is constrained within the first stepped hole. The lower end of the spiral spring passes through the first installation hole and extends below the upper template.

[0016] As an optimized solution, a second installation hole is opened on the lower template. A second stepped hole is provided at the upper port of the second installation hole. The lower end of the guide sleeve abuts against the second stepped hole, and the upper end of the guide sleeve is flush with the upper surface of the lower template.

[0017] As an optimized solution, a third installation hole is opened on the lower template. A third stepped hole is provided at the lower port of the third installation hole. A lower convex platform abutting against the third stepped hole is fixedly connected to the lower end of the small guide post. The upper end of the small guide post passes through the third installation hole and extends above the middle plate.

[0018] As an optimized solution, a fourth mounting hole is provided in the upper template, a fourth stepped hole is provided at the upper port of the fourth mounting hole, an upper boss abutting against the fourth stepped hole is fixedly connected to the upper end of the large guide post, and the lower end of the large guide post passes through the fourth mounting hole and extends below the upper template.

[0019] As an optimized solution, the limiting block is fixed to the lower template by a fastening bolt.

[0020] As an optimized solution, an upper die base plate is fixedly connected to the upper surface of the upper template.

[0021] As an optimized solution, a lower die base plate is fixedly connected to the lower surface of the lower template.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] Before the mold is closed, the hanging spring assembly presses the middle plate tightly against the lower template, preventing the raw material from running into the gap between the middle plate and the lower template, avoiding the problem of glue overflow, saving the time for cleaning the glue overflow, and reducing the cost;

[0024] When the mold is opened, the hanging spring assembly presses the middle plate tightly against the lower template, preventing the middle plate from moving with the upper template, avoiding the upper template from falling midway and damaging the lower template, and reducing the maintenance cost;

[0025] The limiting block prevents the mold from being closed when forgetting to place the middle plate, and the upper template and the lower template are directly pressed together, avoiding damage to the upper template and the lower template, and reducing the maintenance cost;

[0026] The manufacturing cost is low, and the maintenance is convenient; the design is reasonable, and the cooperation between the structures is precise; it is convenient and fast; the stability during the working process is improved; there are few components, the process is simple, and the failure rate is low; the structure is simple, the service life is long; the operation and control are simple, it is easy to be manufactured and installed on a large scale, and the application range is wide. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0028] Figure 1 It is a structural schematic diagram of the present invention.

[0029] In the figure: 1 - upper die base plate; 2 - upper template; 3 - hanging spring assembly; 4 - large guide post; 5 - small guide post; 6 - middle plate; 7 - limiting block; 8 - lower template; 9 - guide sleeve; 10 - lower die base plate; 11 - raw material. Detailed implementation mode

[0030] Hereinafter, embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0031] As Figure 1 shown, the hot pressing and forming die of the spring-top structure includes an upper template 2, a middle plate 6, and a lower template 8 arranged in sequence from top to bottom. A hanging spring assembly 3 is provided on the upper template 2. When the upper template 2 moves downward, the hanging spring assembly 3 first contacts and abuts against the middle plate 6. A limiting block 7 flush with the upper surface of the middle plate 6 is also provided on the lower template 8.

[0032] The upper template 2 is fixedly connected with a large guide post 4 extending downward, and a guide sleeve 9 matching the large guide post 4 is provided on the lower template 8.

[0033] The lower template 8 is also fixedly connected with a small guide post 5 penetrating upward through the middle plate 6, and a guide hole matching the small guide post 5 is also provided on the upper template 2.

[0034] The hanging spring assembly 3 includes a hanging platform and a spiral spring fixed to the lower end of the hanging platform.

[0035] The size of the hanging platform is customized according to the actual size of the inner diameter of the spring according to the H7 / r7 fit tolerance. After the hanging platform and the spiral spring are assembled, the hanging platform is welded to the spring in the spiral gap of the spiral spring to prevent the spring from falling off during long-term use.

[0036] A first installation hole is opened on the upper template 2. A first stepped hole is provided at the upper port of the first installation hole. The hanging platform is constrained within the first stepped hole. The lower end of the spiral spring passes through the first installation hole and extends below the upper template 2.

[0037] A second installation hole is opened on the lower template 8. A second stepped hole is provided at the upper port of the second installation hole. The lower end of the guide sleeve 9 abuts against the second stepped hole, and the upper end of the guide sleeve 9 is flush with the upper surface of the lower template 8.

[0038] A third installation hole is opened on the lower template 8. A third stepped hole is provided at the lower port of the third installation hole. A lower convex platform abutting against the third stepped hole is fixedly connected to the lower end of the small guide post 5. The upper end of the small guide post 5 passes through the third installation hole and extends above the middle plate 6.

[0039] A fourth installation hole is opened on the upper template 2. A fourth stepped hole is provided at the upper port of the fourth installation hole. An upper convex platform abutting against the fourth stepped hole is fixedly connected to the upper end of the large guide post 4. The lower end of the large guide post 4 passes through the fourth installation hole and extends below the upper template 2.

[0040] The limiting block 7 is fixed to the lower template 8 by a fastening bolt.

[0041] The upper surface of the upper template 2 is fixedly connected with the upper die base plate 1.

[0042] The lower surface of the lower template 8 is fixedly connected with the lower die base plate 10.

[0043] The working principle is as follows:

[0044] The templates participating in the forming are the upper template 2, the middle plate 6 and the lower template 8. The limit block 7 plays a role in limiting the die closing and preventing the upper template 2 and the lower template 8 from being damaged due to die closing without placing the middle plate 6. The large guide pillars 4, the small guide pillars 5 and the guide sleeves 9 play a role in guiding and positioning. The hanging spring assembly 3 plays a role in pressing the middle plate 6 during die closing and ejecting the middle plate 6 during die opening. Forming process: Place the raw material 11 to be formed on the middle plate 6. The equipment lowers the upper template 2 and performs a die closing action by positioning with the large guide pillar 4, the guide sleeve 9 and the lower template 8. Before the die closing is completed, the hanging spring assembly 3 contacts the middle plate 6 first. After the spring presses the middle plate 6 tightly, the raw material 11 will be extruded from the middle plate 6 to the lower template 8 by the upper template 2. The upper template 2 continues to move downward. Finally, the upper template 2, the middle plate 6 and the lower template 8 are completely pressed together to complete the die closing. After maintaining at high temperature and high pressure for a period of time, the product forming is completed. Then it is necessary to open the mold to take out the product. During the die opening process, first the upper template 2 rises. At this time, the hanging spring assembly 3 has a force to eject the middle plate 6, separating the upper die from the middle plate 6. Then the middle plate 6 is taken out from the lower template 8 manually or mechanically. Finally, the formed product is taken out from the lower template 8 or the middle plate 6. At this time, the entire forming process is completed.

[0045] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. A hot pressing forming die with a spring-loaded structure, comprising an upper template (2), a middle plate (6), and a lower template (8) arranged in sequence from top to bottom, characterized in that: A hanging spring assembly (3) is provided on the upper template (2). When the upper template (2) moves downward, the hanging spring assembly (3) first comes into contact with the middle plate (6). A limit block (7) flush with the upper surface of the middle plate (6) is provided on the lower template (8). The hanging spring assembly (3) includes a hanging platform and a spiral spring fixed to the lower end of the hanging platform. A first mounting hole is formed in the upper template (2), and a first stepped hole is provided at the upper port of the first mounting hole. The hanging platform is constrained within the first stepped hole, and the lower end of the spiral spring passes through the first mounting hole and extends below the upper template (2). Before the mold is completely closed, the hanging spring assembly presses the middle plate tightly against the lower template, preventing the raw material from running into the gap between the middle plate and the lower template, avoiding the problem of glue overflow, saving the time for cleaning the glue overflow, and reducing costs. When the mold is opened, the hanging spring assembly presses the middle plate tightly against the lower template, preventing the middle plate from moving with the upper template, avoiding the upper template from falling midway and damaging the lower template, and reducing the maintenance cost. A large guide post (4) extending downward is fixedly connected to the upper template (2), and a guide sleeve (9) matching the large guide post (4) is provided on the lower template (8).

2. The hot pressing forming die with an ejector structure according to claim 1, characterized in that: A small guide post (5) penetrating upward through the middle plate (6) is also fixedly connected to the lower template (8), and a guide hole matching the small guide post (5) is further provided on the upper template (2).

3. The hot pressing forming die with an ejector structure according to claim 2, characterized in that: A second mounting hole is formed in the lower template (8), and a second stepped hole is provided at the upper port of the second mounting hole. The lower end of the guide sleeve (9) abuts against the second stepped hole, and the upper end of the guide sleeve (9) is flush with the upper surface of the lower template (8).

4. The hot pressing forming die with a spring-loaded structure according to claim 2, wherein: A third mounting hole is formed in the lower template (8), and a third stepped hole is provided at the lower port of the third mounting hole. A lower convex platform abutting against the third stepped hole is fixedly connected to the lower end of the small guide post (5), and the upper end of the small guide post (5) passes through the third mounting hole and extends above the middle plate (6).

5. The hot pressing forming die with an ejector structure according to claim 2, characterized in that: A fourth mounting hole is formed in the upper template (2), and a fourth stepped hole is provided at the upper port of the fourth mounting hole. An upper convex platform abutting against the fourth stepped hole is fixedly connected to the upper end of the large guide post (4), and the lower end of the large guide post (4) passes through the fourth mounting hole and extends below the upper template (2).

6. The hot pressing and forming die with an ejector structure according to claim 1, wherein: The limit block (7) is fixed to the lower template (8) by a fastening bolt.

7. A hot pressing forming die with a spring-loaded structure according to claim 1, characterized in that: An upper die base plate (1) is fixedly connected to the upper surface of the upper template (2), and a lower die base plate (10) is fixedly connected to the lower surface of the lower template (8).

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