In-mold vacuum forming device

Abstract

The utility model relates to an in-mold vacuum forming device which comprises a female mold which comprises a female mold fixing plate and a female mold plate, and the female mold plate is provided with a female mold forming cavity formed by sinking inwards from the surface; the male mold comprises a male mold fixing plate, a male mold base plate, a male mold bearing plate and a male mold plate, the male mold plate is provided with a male mold forming cavity formed by sinking inwards from the surface, and the female mold forming cavity and the male mold forming cavity are oppositely arranged; the mounting grooves are formed by inwards sinking one opposite surfaces of a plurality of plate bodies included in the female mold and the male mold; the sealing ring is arranged in the mounting groove, and a closed cavity is formed in the mold; the male die bearing plate is provided with an air exhaust channel which is formed by sinking inwards from the outer surface, and the air exhaust channel is communicated with the cavity; through split type module design, multiple sealing ring layout, a centralized air exhaust channel and real-time air pressure monitoring, the sealing performance and the structural rigidity are remarkably improved while it is guaranteed that the mold is easy to disassemble and clean, and therefore high-stability vacuum injection molding is achieved, and the mold is suitable for scenes with strict requirements for the surface quality of products.

Description

Technical Field

[0001] This invention relates to the field of mold technology, and more particularly to an in-mold vacuum forming apparatus. Background Technology

[0002] Air entrapment is one of the main problems leading to product defects during injection molding. Traditional molds mainly vent through venting grooves or the parting line gap, but the venting efficiency is limited. Especially for complex structures or high-precision products, defects such as short material, burning, and air bubbles are still prone to occur. In addition, conventional venting designs may cause flash or dimensional deviations, affecting product quality.

[0003] According to Chinese patent CN201821304837, an in-mold vacuum device is disclosed. This device sets a spiral venting groove on the mold core insert, which is connected to the mold plate extraction channel. It uses a vacuum pump to actively extract air, reduce residual air in the cavity, and improve the injection filling effect. However, the device focuses on the spiral venting groove design, which is relatively complex and difficult to clean. In addition, the device only relies on the cooperation between the spiral venting groove and the extraction channel, which may lead to slight leakage after the mold is closed, affecting the stability of the vacuum degree.

[0004] Therefore, it is necessary to develop an in-mold vacuum forming device to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide an in-mold vacuum forming device that is easy to clean and has high stability.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an in-mold vacuum forming device, comprising:

[0007] The master mold includes a master mold fixing plate and a master template fixedly connected to the master mold fixing plate, the master template having a master mold forming cavity formed by recessing from the surface inward;

[0008] The male mold includes a male mold fixing plate, a male mold pad plate fixedly connected to the male mold fixing plate, a male mold support plate and a male mold template stacked on the male mold pad plate, the male mold template having a male mold forming cavity formed by recessing from the surface inward, and the female mold forming cavity and the male mold forming cavity being disposed opposite to each other;

[0009] The mounting groove is recessed inward from the opposite side of the plurality of plates included in the female mold and the male mold;

[0010] A sealing ring is provided inside the mounting groove, forming a sealed cavity inside the mold;

[0011] The mold plate has an air extraction channel formed by a recess from the outer surface inward, and the air extraction channel is connected to the cavity.

[0012] Furthermore, the female mold template has a female mold vent hole that runs through its upper and lower surfaces. One end of the female mold vent hole is located between the female mold fixing plate and the female mold template and is surrounded by the sealing ring. The other end is located on the lower surface of the female mold template and corresponds to the male mold.

[0013] Furthermore, the male mold template has a male mold vent hole that runs through its upper and lower surfaces. The male mold vent hole is surrounded by the sealing ring, with one end connected to the female mold vent hole and the other end connected to the air extraction channel.

[0014] Furthermore, the air extraction channel includes a main air extraction channel and a branch air extraction channel. The main air extraction channel is formed by recessing inward from the outer surface of the male mold support plate, and the branch air extraction channels are formed by recessing inward from the upper and lower surfaces of the male mold support plate and communicating with the main air extraction channel.

[0015] Furthermore, the air extraction channel is connected to the ventilation hole of the male mold.

[0016] Furthermore, the male template has an inwardly recessed mounting groove that surrounds the male mold forming cavity. The sealing ring is provided inside the mounting groove, and the sealing ring contacts the surfaces of the male template and the female template respectively when the mold is closed.

[0017] Furthermore, the female mold fixing plate is provided with an inwardly recessed mounting groove formed from the side opposite to the female mold template, and a sealing ring is provided in the mounting groove, the sealing ring contacting the female mold fixing plate and the female mold template respectively.

[0018] Furthermore, the male mold support plate has an inwardly recessed mounting groove on the side opposite to the male mold pad, and a sealing ring is provided inside the mounting groove, the sealing ring contacting the male mold support plate and the male mold pad respectively.

[0019] Furthermore, the male mold support plate also has an inwardly recessed mounting groove from the side opposite to the male mold template, and a sealing ring is provided inside the groove. The sealing ring contacts the male mold support plate and the male mold template respectively.

[0020] Furthermore, the bottom of the male mold pad is recessed inward from the side opposite to the male mold fixing plate to form an installation groove, and a sealing ring is provided inside it. The sealing ring contacts the male mold fixing plate and the male mold pad respectively.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model is an in-mold vacuum forming device, which has the characteristics of easy cleaning and high stability. Through the split module design, multiple sealing ring layout, centralized air extraction channel and real-time air pressure monitoring, while ensuring that the mold is easy to disassemble and clean, it significantly improves the sealing performance and structural rigidity, thereby realizing highly stable vacuum injection molding, which is especially suitable for scenarios with strict requirements on product surface quality. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0023] Figure 1 This is a three-dimensional structural diagram of an in-mold vacuum forming device according to the present invention;

[0024] Figure 2 for Figure 1 A schematic cross-sectional view of the in-mold vacuum forming device shown.

[0025] Figure 3 for Figure 2 The diagram shows an equiaxed side section of the in-mold vacuum forming device.

[0026] In the diagram: 1. Female mold; 2. Male mold; 11. Female mold fixing plate; 12. Female mold plate; 13. Groove; 14. Positioning ring; 15. Sprue; 16. Female mold forming cavity; 17. Female mold vent hole; 21. Male mold fixing plate; 22. Male mold pad; 23. Male mold support plate; 24. Male mold plate; 25. Male mold vent hole; 26. Inspection interface; 3. Mounting groove; 4. Sealing ring; 5. Ejection device; 51. Ejector pin; 221. Cavity; 231. Air extraction channel; 2311. Main air extraction channel; 2312. Support air extraction channel; 232. Interface; 241. Male mold forming cavity. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please refer to Figures 1 to 3This utility model is an in-mold vacuum forming device, which includes a female mold 1 and a male mold 2.

[0029] Please refer to Figures 1 to 2 The master mold 1 includes a master mold fixing plate 11 and a master mold template 12 synchronized with the master mold fixing plate 11. The master mold fixing plate 11 has a groove 13 formed by recessing from the upper surface. The shape of the groove 13 can be changed according to requirements. In this embodiment, the groove 13 is circular. The diameter of the top of the groove 13 is larger than the diameter of the bottom of the groove 13. A positioning ring 14 is installed on the top of the groove 13, and a nozzle 15 is installed on the bottom of the groove 13. The positioning ring 14 is used to connect other equipment, and the nozzle 15 penetrates the master mold fixing plate 11 for conveying plastic.

[0030] The mother mold 12 is fixedly connected to the mother mold fixing plate 11. It has a mother mold forming cavity 16 formed by recesses from the surface inward. The shape of the mother mold forming cavity 16 matches part of the shape of the product. The nozzle 15 penetrates the mother mold 12 and extends into the mother mold forming cavity 16. Specifically, the injected plastic enters the mother mold forming cavity 16 in sequence through the positioning ring 14, the groove 13, and the nozzle 15.

[0031] The female mold fixing plate 11 is provided with an installation groove 3 formed by recessing inward from the side opposite to the female mold template 12. The installation groove 3 is annular and surrounds the nozzle 15. A sealing ring 4 is provided in the installation groove 3, and the sealing ring 4 contacts the female mold fixing plate 11 and the female mold template 12 respectively.

[0032] The female mold plate 12 has a female mold vent 17 that runs through its upper and lower surfaces. One end of the female mold vent 17 is located between the female mold fixing plate 11 and the female mold plate 12 and is surrounded by a sealing ring 4. The other end of the female mold vent 17 is located on the lower surface of the female mold plate 12 and corresponds to the male mold 2.

[0033] A sealing ring 4 is provided on the contact surface between the nozzle 15 and the mold fixing plate 11, and the sealing ring 4 surrounds the nozzle 15.

[0034] Please refer to Figures 2 to 3 The male mold 2 includes a male mold fixing plate 21, a male mold pad 22 fixedly connected to the male mold fixing plate 21, a male mold support plate 23 superimposed on the male mold pad 22, and a male mold template 24. The male mold fixing plate 21 is arranged parallel to the female mold fixing plate 11. The male mold pad 22 forms a cavity 221 inside, which penetrates the upper and lower surfaces of the male mold pad 22. An ejection device 5 is provided inside the cavity 22. Furthermore, the bottom of the male mold pad 22 is fixedly connected to the male mold fixing plate 21, and its top extends vertically to contact the male mold support plate 23. The bottom of the male mold pad 22 is recessed inward from the side opposite to the male mold fixing plate 21 to form an installation groove 3. The installation groove 3 surrounds the ejection device 5 and has a sealing ring 4 inside. The sealing ring 4 contacts the male mold fixing plate 21 and the male mold pad 22 respectively.

[0035] Please refer to Figure 3The surface of the male mold support plate 23 is in contact with the surface of the male mold pad plate 22 and the surface of the male mold template 24, respectively. It has an inwardly recessed mounting groove 3 from the side opposite to the male mold pad plate 22. The mounting groove 3 surrounds the ejection device 5 and has a sealing ring 4 inside. The sealing ring 4 is in contact with the male mold support plate 23 and the male mold pad plate 22, respectively. The male mold support plate 23 also has an inwardly recessed mounting groove 3 from the side opposite to the male mold template 24. The mounting groove 3 is located inside the mounting groove 3 from the side opposite to the male mold pad plate 22. The sealing ring 4 is inside. The sealing ring 4 is in contact with the male mold support plate 23 and the male mold template 24, respectively.

[0036] Please refer to Figure 3 The mold support plate 23 has an air extraction channel 231 and an interface 232 connected to the air extraction channel 231. The air extraction channel 231 includes a main air extraction channel 2311 and a branch air extraction channel 2312. The main air extraction channel 2311 is recessed inward from the outer surface of the mold support plate 23. The branch air extraction channels 2312 are recessed inward from the upper and lower surfaces of the mold support plate 23 and communicate with the main air extraction channel 2311. The interface 232 is connected to a vacuum pump (not shown).

[0037] The male mold template 24 has a male mold forming cavity 241 formed by recessing from its upper surface. The shape of the male mold forming cavity 241 matches the shape of part of the product formed by recessing from its upper surface. It is positioned opposite to the female mold forming cavity 16. The male mold template 24 has an installation groove 3 formed by recessing from its surface. The installation groove 3 is annular and surrounds the male mold forming cavity 241. A sealing ring 4 is provided inside the installation groove 3. When the mold is closed, the sealing ring 4 contacts the surfaces of the male mold template 24 and the female mold template 12 respectively.

[0038] The male mold plate 24 has a male mold vent 25 extending through its upper and lower surfaces. The male mold vent 25 is surrounded by a sealing ring 4. One end of the male mold vent 25 is connected to the female mold vent 17, and the other end is connected to the air extraction branch channel 2312. The other air extraction branch channel 2312 is connected to the cavity 221.

[0039] The ejection device 5 includes an ejector pin 51, which extends from the cavity 221 through the male mold support plate 23 and the male mold plate 24 into the male mold forming cavity 241. The contact surface between the ejector pin 51 and the male mold fixing plate 21 is provided with a sealing ring 4, which surrounds the ejector pin 51.

[0040] Preferably, the mold support plate 23 is provided with a detection interface 26, which is connected to the cavity 221 and a monitoring meter (not shown) for detecting the air pressure inside the mold.

[0041] When using the in-mold vacuum forming device of this utility model, the female mold 1 and the male mold 2 are closed, the female template 12 and the male template 24 are in contact, and the sealing ring 4 fills the gap between the female template 12 and the male template 24. At this time, each sealing ring 4 fills the gap between the contact surfaces of each plate, so that a relatively sealed cavity is formed in the mold. The high-pressure mold-closing injection molding machine starts to inject plastic, and the vacuum pump continuously sucks air into the mold through the air extraction channel 231. The air pressure in the mold is detected by the monitoring meter, so that a vacuum state is formed in the area of ​​the mold sealing ring 4. After the product is formed, the female mold 1 and the male mold 2 are opened, and the ejector pin 51 ejects the product.

[0042] This utility model is an in-mold vacuum forming device, which features easy cleaning and high stability. Through a split-module design, multiple sealing ring layout, centralized air extraction channel and real-time air pressure monitoring, it significantly improves sealing performance and structural rigidity while ensuring easy disassembly and cleaning of the mold, thereby achieving highly stable vacuum injection molding. It is especially suitable for scenarios with strict requirements on product surface quality.

[0043] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An in-mold vacuum forming apparatus, characterized in that, include: The master mold (1) includes a master mold fixing plate (11) and a master template (12) fixedly connected to the master mold fixing plate (11), wherein the master template (12) has a master mold forming cavity (16) formed by recessing from the surface inward; The male mold (2) includes a male mold fixing plate (21), a male mold pad (22) fixedly connected to the male mold fixing plate (21), a male mold support plate (23) stacked on the male mold pad (22), and a male mold template (24). The male mold template (24) has a male mold forming cavity (241) formed by recessing from the surface inward. The female mold forming cavity (16) and the male mold forming cavity (241) are arranged opposite to each other. The mounting groove (3) is recessed inward from the opposite side of the plurality of plates included in the female mold (1) and the male mold (2); A sealing ring (4) is provided inside the mounting groove (3), forming a sealed cavity inside the mold; The mold support plate (23) has an air extraction channel (231) formed by a recess from the outer surface to the inner surface, and the air extraction channel (231) is connected to the cavity.

2. The in-mold vacuum forming apparatus according to claim 1, characterized in that, The female template (12) has a female mold vent (17) that runs through its upper and lower surfaces. One end of the female mold vent (17) is located between the female mold fixing plate (11) and the female template (12) and is surrounded by the sealing ring (4). The other end is located on the lower surface of the female template (12) and corresponds to the male mold (2).

3. The in-mold vacuum forming apparatus according to claim 2, characterized in that, The male mold plate (24) has a male mold vent hole (25) that runs through its upper and lower surfaces. The male mold vent hole (25) is surrounded by the sealing ring (4). One end of the male mold vent hole (25) is connected to the female mold vent hole (17), and the other end is connected to the air extraction channel (231).

4. The in-mold vacuum forming apparatus according to claim 3, characterized in that, The air extraction channel (231) includes a main air extraction channel (2311) and a branch air extraction channel (2312). The main air extraction channel (2311) is recessed inward from the outer surface of the male mold support plate (23). The branch air extraction channels (2312) are recessed inward from the upper and lower surfaces of the male mold support plate (23) and communicate with the main air extraction channel (2311).

5. The in-mold vacuum forming apparatus according to claim 4, characterized in that, The air extraction branch channel (2312) is connected to the ventilation hole (25) of the male mold.

6. The in-mold vacuum forming apparatus according to claim 1, characterized in that, The male template (24) has an inwardly recessed mounting groove (3) that surrounds the male mold forming cavity (241). The mounting groove (3) is provided with a sealing ring (4) inside. When the mold is closed, the sealing ring (4) contacts the surfaces of the male template (24) and the female template (12) respectively.

7. The in-mold vacuum forming apparatus according to claim 1, characterized in that, The female mold fixing plate (11) is provided with an installation groove (3) formed by recessing inward from the side opposite to the female mold template (12). A sealing ring (4) is provided in the installation groove (3), and the sealing ring (4) contacts the female mold fixing plate (11) and the female mold template (12) respectively.

8. The in-mold vacuum forming apparatus according to claim 1, characterized in that, The male mold support plate (23) has an inwardly recessed mounting groove (3) on the side opposite to the male mold pad plate (22). A sealing ring (4) is provided inside the mounting groove (3), and the sealing ring (4) contacts the male mold support plate (23) and the male mold pad plate (22) respectively.

9. The in-mold vacuum forming apparatus according to claim 8, characterized in that, The male mold support plate (23) also has an inwardly recessed mounting groove (3) on the side opposite to the male template (24), and a sealing ring (4) is provided inside the groove. The sealing ring (4) contacts the male mold support plate (23) and the male template (24) respectively.

10. The in-mold vacuum forming apparatus according to claim 1, characterized in that, The bottom of the male mold pad (22) is recessed inward from the side opposite to the male mold fixing plate (21) to form an installation groove (3), and a sealing ring (4) is provided inside it. The sealing ring (4) contacts the male mold fixing plate (21) and the male mold pad (22) respectively.

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