Elastic plate type deep-cavity thin-wall mold

Abstract

The utility model provides an elastic plate type deep-cavity thin-wall die which comprises an upper die plate and a lower die plate which can realize die assembly, the lower end of the upper die plate is provided with a movable plate and an elastic component which enables the movable plate to have a downward movement trend, the sliding direction of the movable plate is parallel to the die assembly direction, an upper die insert is fixed at the lower end of the upper die plate, and a lower die insert is fixed at the lower end of the lower die plate. An upper mold insert is fixed at the upper end of the movable plate, a material injection hole communicated with a hot nozzle is formed in the upper mold insert, an upper mold core is fixed at the lower end of the movable plate, an insert hole for allowing the upper mold insert to be inserted from top to bottom and forming a complete upper molding surface is formed in the upper mold core, and the insert hole is communicated with the upper bottom surface of the movable plate and can allow air to enter during mold splitting. The elastic plate type deep-cavity thin-wall mold disclosed by the utility model is compact in structure, capable of realizing vacuum breaking mold splitting, improving the stability of vacuum breaking demolding, reducing the failure rate in the production process, improving the product quality and the yield, good in use effect and long in service life.

Description

Technical Field

[0001] This utility model relates to a mold, and more particularly to a spring plate type deep cavity thin-walled mold. Background Technology

[0002] For molds with large cavity depths, the following problems often occur during mold opening: During deep cavity injection, due to the high pressure, the plastic or metal material is difficult to demold smoothly after solidification in the mold. In particular, due to the negative pressure adsorption between the product and the cavity, these mold opening problems directly affect the production quality and efficiency of the product, increase manufacturing costs, and are very likely to affect the service life of the mold.

[0003] Existing mold-making technologies mainly focus on solving the mold-making problem of shallow cavity molds. For molds with larger cavity depths, existing technical solutions often yield little result. Utility Model Content

[0004] Technical problems to be solved

[0005] The technical problem to be solved by this utility model is to provide a spring plate type deep cavity thin-walled mold with a compact structure that can realize the smooth and fast demolding of deep cavity products.

[0006] Technical solutions to the problem

[0007] This utility model provides a spring plate type deep cavity thin-walled mold, including an upper template 11 and a lower template 13 for mold closing. The lower end of the upper template 11 is provided with a movable plate 12 and an elastic component that causes the movable plate 12 to have a downward movement tendency. The sliding direction of the movable plate 12 is parallel to the mold closing direction. An upper mold insert is fixed to the lower end of the upper template 11. The upper mold insert has an injection hole that communicates with the hot runner. An upper mold core 4 is fixed to the lower end of the movable plate 12. The upper mold core 4 has an insert hole that allows the upper mold insert to be inserted from top to bottom and form a complete upper forming surface. The insert hole communicates with the upper bottom surface of the movable plate 12 and allows air to enter during mold parting.

[0008] Furthermore, the upper mold insert includes an insert mounting base 111 fixed to the bottom of the upper mold plate 11 and an insert body 112 fixed to the lower end of the insert mounting base 111. The moving plate 12 has a sleeve hole for the insert mounting base 111 to pass through. There is a first gap 11a between the inner wall of the sleeve hole and the outer wall of the insert mounting base 111. The insert hole communicates with the upper surface of the moving plate 12 through the first gap 11a.

[0009] Furthermore, there is a second gap 11b between the outer wall of the insert body 112 and the inner wall of the insert hole, and the second gap 11b communicates with the first gap 11a.

[0010] Furthermore, the insert hole is a stepped hole that is larger at the top and smaller at the bottom.

[0011] Furthermore, the movable plate 12 is slidably fitted between the upper template 11 and the lower template 13 via guide posts. A limiting component is provided between the upper template 11 and the movable plate 12. The limiting component includes a limiting stud 121. A limiting hole 120 passes through the movable plate 12. The limiting hole 120 is a stepped hole with a smaller upper end and a larger lower end. The limiting stud 121 is a stepped bolt that passes through the limiting hole 120 from bottom to top and is threadedly connected to the upper template 11 to limit the movement of the movable plate.

[0012] Furthermore, the travel distance of the moving plate 12 is greater than or equal to 0.5 mm and less than or equal to 5 mm.

[0013] Furthermore, the elastic component is a compression spring and is disposed between the upper template 11 and the moving plate 12.

[0014] Furthermore, the elastic components are arranged in a matrix between the upper template 11 and the moving plate 12.

[0015] Furthermore, the bottom surface of the upper template 11 is provided with a first spring hole 1101, and the upper bottom surface of the moving plate 12 is provided with a second spring hole 1201 coaxial with the first spring hole 1101. The elastic component is a compression spring and is disposed between the first spring hole 1101 and the second spring hole 1201.

[0016] Furthermore, the first spring hole 1101 is an annular concave hole, and the second spring hole 1201 is a circular concave hole.

[0017] Furthermore, the upper mold core 4 is multiple and forms a multi-cavity structure.

[0018] Furthermore, the lower mold plate 13 is provided with a lower mold core 5 corresponding to the upper mold core 4. The bottom surface of the upper mold core 4 is provided with a positioning boss 41 with a cross-section of a regular N-gon. The side wall of the positioning boss 41 is inclined and forms a first positioning surface 41a. A wear-resistant plate 42 is detachably installed on the first positioning surface 41a. The side wall of the wear-resistant plate 42 is parallel to and higher than the first positioning surface 41a and forms a second positioning surface. The top surface of the lower mold core 5 is provided with a positioning recess 50 for the positioning boss 41 to be inserted and positioned. The side wall of the positioning recess 50 is inclined and can fit against the first positioning surface and / or the second positioning surface to form a third positioning surface.

[0019] Furthermore, an installation groove is provided on the first positioning surface 41a, and the wear-resistant sheet is detachably installed in the installation groove by bolts.

[0020] Furthermore, the protrusion height of the wear-resistant sheet is 1mm-4mm.

[0021] Furthermore, the protrusion height of the wear-resistant sheet is 2mm-3mm.

[0022] Furthermore, there are an even number of first positioning surfaces 41a, and the wear-resistant pieces 42 are arranged at intervals on each of the first positioning surfaces 41a.

[0023] Beneficial effects

[0024] This utility model relates to a spring-loaded deep-cavity thin-walled mold, employing a moving plate and a split-type insert structure. During mold parting, it allows air to enter and eliminates vacuum, enabling rapid separation of the upper mold from the product. This effectively avoids demolding difficulties and product damage caused by vacuum adsorption. The moving plate features a short stroke and negligible travel distance, not affecting the mold opening stroke or time, resulting in high production efficiency. Furthermore, the short stroke and elastic design of the moving plate reduce impact during mold parting and closing, extending the mold's service life. In addition, this structure reduces energy consumption while ensuring product precision and efficiency, meeting the demands of modern manufacturing for green production. To meet production needs; the spring hole structure improves the installation accuracy and operational reliability of the spring, prevents deflection, and reduces installation space, thus improving structural compactness; the addition of wear-resistant plates significantly enhances the overall wear resistance and service life of the mold. After the second positioning surface wears down, the lower first forming surface can withstand the mold closing pressure again, or the wear-resistant plates can be replaced, greatly increasing the service life; this utility model of a spring plate type deep cavity thin-walled mold has a compact structure, can achieve vacuum breaking mold separation, improves the stability of vacuum breaking demolding, reduces the failure rate in the production process, improves product quality and yield, has good performance, and a long service life. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the spring plate type deep cavity thin-walled mold of this utility model;

[0026] Figure 2 This is a cross-sectional view of the spring plate type deep cavity thin-walled mold of this utility model;

[0027] Figure 3 for Figure 2 Enlarged view of section A in the middle;

[0028] Figure 4 for Figure 3 Enlarged view of section B in the middle;

[0029] Figure 5 This is another planar sectional view of the spring plate type deep cavity thin-walled mold of this utility model;

[0030] Figure 6 for Figure 5 Enlarged view of section C;

[0031] Figure 7 for Figure 5 Enlarged view of section D;

[0032] Figure 8 This is a diagram showing the closed state of the upper and lower mold cores of the spring plate type deep cavity thin-walled mold of this utility model;

[0033] Figure 9 This is a parting diagram of the upper and lower mold cores of the spring plate type deep cavity thin-walled mold of this utility model;

[0034] Figure 10 This is another angle view of the parting state of the upper and lower mold cores of the spring plate type deep cavity thin wall mold of this utility model;

[0035] Figure 11 This is a schematic diagram of the upper mold core of the spring plate type deep cavity thin-walled mold of this utility model. Detailed Implementation

[0036] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0037] See Figures 1-11 This utility model provides a spring-loaded deep-cavity thin-walled mold for injection molding of deep-cavity products, such as plastic cups. It features a deep cavity and thin walls, and includes an upper mold plate 11 and a lower mold plate 13. The upper mold plate 11 and the lower mold plate 13 are connected by four guide pillars, allowing them to move closer or further apart to achieve mold closing and opening. In this application, a movable plate 12 is slidably mounted on the lower end of the lower mold. The movable plate is slidably mounted on the lower end of the upper mold plate 11 via guide pillars, and its sliding direction is parallel to the mold closing direction. Simultaneously, an elastic component, a compression spring, is provided between the upper mold plate 11 and the movable plate 12, causing the movable plate 12 to have a downward movement tendency. The components are multiple and arranged in a matrix between the upper template 11 and the moving plate 12. In order to improve the installation stability of the elastic components and avoid deflection, a first spring hole 1101 is provided on the bottom surface of the upper template 11, and a second spring hole 1201 coaxial with the first spring hole 1101 is provided on the upper bottom surface of the moving plate 12. The compression spring is arranged between the first spring hole 1101 and the second spring hole 1201 to fix the two ends of the compression spring. In this embodiment, the first spring hole 1101 is an annular concave hole and the second spring hole 1201 is a circular concave hole, which can improve the installation reliability of the spring while reducing its installation space.

[0038] An upper mold insert is fixed at the lower end of the upper mold plate 11. An injection hole is provided on the upper mold insert, which is connected to the hot nozzle for injecting molten material. An upper mold core 4 is fixed at the lower end of the moving plate 12. An insert hole is provided on the upper mold core 4, which allows the upper mold insert to be inserted from top to bottom, thereby forming a complete upper molding surface. It can be molded with the lower mold core 5 on the lower mold plate 13 to form a complete molding cavity. That is, a molding cavity is formed between the upper mold core 4, the upper mold insert, and the lower mold core. The insert hole is connected to the upper bottom surface of the moving plate 12. When the mold is separated, the top surface of the moving plate 12 is separated from the bottom surface of the upper mold plate 11, forming a gap, which allows air to enter the insert hole, eliminates negative pressure, and facilitates the smooth upward movement and demolding of the upper mold.

[0039] Specifically, the upper mold insert includes an insert mounting base 111 and an insert body 112. The insert mounting base 111 is cylindrical, with its axis parallel to the guide post direction, i.e., parallel to the mold closing direction. A sleeve hole coaxial with the insert mounting base 111 is provided on the moving plate 12. The insert mounting base is fixed to the bottom of the upper mold plate 11 and fitted into the sleeve hole. A first gap 11a, 0.1mm-0.5mm, exists between the inner wall of the sleeve hole and the outer wall of the insert mounting base 111. The insert hole communicates with the upper surface of the moving plate 12 through the first gap 11a to allow air to enter during mold parting. A central hole 110 is provided on the insert mounting base 111 for mounting a hot runner. The insert body 112 is fixed to the bottom of the insert mounting base 111. The cross-section of the insert body 112 is also circular. The center of the insert body 112 is provided with a mounting hole for inserting the head of the hot nozzle. A sprue hole is provided on the bottom surface of the insert body 112, which is connected to the hot nozzle. In this embodiment, the insert body 112 is a stepped shaft with a larger upper end and a smaller lower end, and the insert hole is a stepped hole with a larger upper end and a smaller lower end. There is a second gap 11b between the outer wall of the insert body 112 and the inner wall of the insert hole. The second gap 11b is connected to the first gap 11a. The second gap is larger than the first gap. In this embodiment, the width of the second gap is 0.5mm-1mm. The bottom surface of the insert body 112 is part of the molding surface. When the mold is closed, the insert body is fully inserted into the insert hole. At this time, the bottom surface of the insert body and the upper mold core 4 form a complete upper molding surface, and it and the lower molding surface of the lower mold core form a complete molding cavity. The sprue hole is connected to the molding cavity.

[0040] In this application, the movable plate 12 is slidably fitted between the upper mold plate 11 and the lower mold plate 13 via four guide pillars on the corner of the mold. Simultaneously, a limiting component is provided between the upper mold plate 11 and the movable plate 12 to limit the lower limit position of the movable plate. This limiting component includes a limiting stud 121. A limiting hole 120 penetrates the movable plate 12; this limiting hole 120 is a stepped hole, smaller at the top and larger at the bottom. The limiting stud 121 is a stepped bolt, which passes through the limiting hole 120 from bottom to top and is threadedly connected to the upper mold plate 11, thereby limiting the position of the movable plate. The device includes a smooth rod body and a bolt body located at the head of the smooth rod body. A stepped surface is provided between the smooth rod body and the bolt body. The bolt body is threaded into a screw hole at the bottom of the upper template, and the stepped surface on the bolt contacts the bottom surface of the upper template to achieve circumferential limiting. The smooth rod body is located in the small hole of the limiting hole 120. A head is provided at the tail of the smooth rod body. The diameter of the head is larger than the diameter of the smooth rod body. It is located in the large hole of the limiting hole to achieve travel limiting of the moving plate. In this embodiment, the travel of the moving plate 12 is greater than or equal to 0.5 mm and less than or equal to 5 mm.

[0041] In this application, there are multiple upper mold cores 4 and lower mold cores 5, forming a multi-cavity structure, and the above-mentioned insert structure is provided on each upper mold core 4.

[0042] Due to the frequent mold closing and opening during operation, wear is a persistent problem, especially for molds used in high-hardness, high-temperature environments. Accelerated mold wear affects the quality and production efficiency of injection molded products, leading to increased production costs. Typically, for complex injection molds, manufacturers replace materials in certain critical parts or add extra wear-resistant components to improve wear resistance and extend their service life. Therefore, in this application, a wear-resistant plate is provided between the upper and lower mold cores.

[0043] Specifically, a positioning boss 41 with a regular N-sided cross-section is provided on the bottom surface of the upper mold core 4. The side wall of the positioning boss 41 is inclined, forming a first positioning surface 41a for positioning and guiding. The corresponding lower mold core 5 has a positioning recess 50 on its top surface for inserting the positioning boss 41 and achieving positioning. The side wall of the positioning recess 50 is inclined, forming a third positioning surface that can fit against the first positioning surface. In this application, a wear-resistant plate 42 is detachably installed on the first positioning surface 41a. The side wall of the wear-resistant plate 42 forms a second positioning surface. The second positioning surface is parallel to the first positioning surface 41a and higher than the first positioning surface 41a, i.e., protrudes from the first positioning surface 41a. When the mold is closed, the second positioning surface bears the main pressure, thereby effectively dispersing the pressure borne by the mold during the mold closing process and significantly improving the overall wear resistance and service life of the mold. Furthermore, this structure not only reduces dimensional deviations in injection-molded products caused by wear, but also lowers maintenance costs. When the second positioning surface wears down, the lower first molding surface can still withstand the mold closing pressure, thus significantly increasing its service life. In this application, the protrusion height of the wear-resistant sheet is 1mm-4mm, preferably 2mm-3mm. The material of the wear-resistant sheet 42 is preferably high-speed steel or hard alloy to ensure excellent thermal stability and wear resistance. Simultaneously, the surface of the wear-resistant sheet 42 can undergo special treatment, such as coating treatment, to further improve its wear resistance. During mold parting, this structure effectively reduces heat generated by friction, lowers the mold wear rate, and ensures the precision and production efficiency of the injection-molded products. To facilitate quick positioning and installation, in this application, a mounting groove is provided on the first positioning surface 41a. The shape of the mounting groove is the same as that of the wear-resistant plate, i.e., rectangular. The wear-resistant plate is detachably installed in the mounting groove by bolts. To further improve the reliability and stability of use and reduce costs, there is an even number of first positioning surfaces 41a, and the wear-resistant plates 42 are arranged at intervals on each first positioning surface 41a, i.e., one wear-resistant plate 42 is installed every other first positioning surface.

[0044] The working principle of this application is briefly explained below;

[0045] The lower mold is used as the moving mold. During mold closing, the lower mold moves upward, and the lower mold core contacts the upper mold core. Then it continues to move upward, pushing the moving plate upward until the upper bottom surface of the moving plate is in contact with the bottom surface of the upper mold plate, reaching the upper limit position. At this time, mold closing is completed, and a complete molding cavity is formed between the upper mold insert, the upper mold core, and the lower mold. During mold opening, the lower mold moves downward. Due to the spring force, the moving plate is pushed downward. During this process, the upper mold core and the lower mold core are always in contact. First, the upper surface of the moving plate separates from the bottom surface of the upper mold plate, creating a gap between them. Air passes through this gap and enters the gap between the insert body and the insert hole. During this process, relative motion occurs between the upper mold core and the upper mold insert body. That is, relative to the upper mold core, the upper mold insert moves upward, allowing air to enter the molding cavity, specifically into the upper mold core. It continues to move downward. When the guide plate moves to the lower stroke and can no longer move downward, the lower mold continues to move downward. Because of the presence of air, the vacuum is eliminated. Therefore, the upper mold core can be smoothly separated from the product, realizing upper mold demolding.

[0046] This utility model relates to a spring-loaded deep-cavity thin-walled mold, employing a moving plate and a split-type insert structure. During mold parting, it allows air to enter and eliminates vacuum, enabling rapid separation of the upper mold from the product. This effectively avoids demolding difficulties and product damage caused by vacuum adsorption. The moving plate features a short stroke and negligible travel distance, not affecting the mold opening stroke or time, resulting in high production efficiency. Furthermore, the short stroke and elastic design of the moving plate reduce impact during mold parting and closing, extending the mold's service life. In addition, this structure reduces energy consumption while ensuring product precision and efficiency, meeting the demands of modern manufacturing for green production. To meet production needs; the spring hole structure improves the installation accuracy and operational reliability of the spring, prevents deflection, and reduces installation space, thus improving structural compactness; the addition of wear-resistant plates significantly enhances the overall wear resistance and service life of the mold. After the second positioning surface wears down, the lower first forming surface can withstand the mold closing pressure again, or the wear-resistant plates can be replaced, greatly increasing the service life; this utility model of a spring plate type deep cavity thin-walled mold has a compact structure, can achieve vacuum breaking mold separation, improves the stability of vacuum breaking demolding, reduces the failure rate in the production process, improves product quality and yield, has good performance, and a long service life.

[0047] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A spring-loaded deep-cavity thin-walled mold, characterized in that: The mold includes an upper mold plate and a lower mold plate for mold closing. The lower end of the upper mold plate is provided with a movable plate and an elastic component that gives the movable plate a downward movement tendency. The sliding direction of the movable plate is parallel to the mold closing direction. An upper mold insert is fixed to the lower end of the upper mold plate. The upper mold insert has an injection hole that communicates with the hot runner. An upper mold core is fixed to the lower end of the movable plate. The upper mold core has an insert hole that allows the upper mold insert to be inserted from top to bottom and form a complete upper forming surface. The insert hole communicates with the upper bottom surface of the movable plate and allows air to enter during mold parting to achieve vacuum breaking.

2. The spring-loaded deep-cavity thin-walled mold as described in claim 1, characterized in that: The upper mold insert includes an insert mounting base fixed to the bottom of the upper mold plate and an insert body fixed to the lower end of the insert mounting base. The moving plate has a sleeve hole for the insert mounting base to pass through. There is a first gap between the inner wall of the sleeve hole and the outer wall of the insert mounting base. The insert hole communicates with the upper surface of the moving plate through the first gap.

3. The spring-loaded deep-cavity thin-walled mold as described in claim 2, characterized in that: There is a second gap between the outer wall of the insert body and the inner wall of the insert hole, and the second gap communicates with the first gap.

4. The spring-loaded deep-cavity thin-walled mold as described in claim 1, characterized in that: The insert hole is a stepped hole that is larger at the top and smaller at the bottom.

5. The spring-loaded deep-cavity thin-walled mold as described in claim 1, characterized in that: The movable plate is slidably fitted between the upper template and the lower template via guide posts. A limiting component is provided between the upper template and the movable plate. The limiting component includes a limiting stud. A limiting hole passes through the movable plate. The limiting hole is a stepped hole with a smaller upper end and a larger lower end. The limiting stud is a stepped bolt that passes through the limiting hole from bottom to top and is threaded to the upper template to limit the movement of the movable plate.

6. The spring-loaded deep-cavity thin-walled mold as described in claim 1, characterized in that: The moving plate has a travel distance greater than or equal to 0.5 mm and less than or equal to 5 mm.

7. The spring-loaded deep-cavity thin-walled mold as described in claim 1, characterized in that: The lower bottom surface of the upper template is provided with a first spring hole, and the upper bottom surface of the moving plate is provided with a second spring hole coaxial with the first spring hole. The elastic component is a compression spring and is disposed between the first spring hole and the second spring hole.

8. The spring-loaded deep-cavity thin-walled mold as described in claim 1, characterized in that: The lower mold plate is provided with a lower mold core corresponding to the upper mold core. The bottom surface of the upper mold core is provided with a positioning boss with a regular polygonal cross-section. The side wall of the positioning boss is inclined and forms a first positioning surface. A wear-resistant plate is detachably installed on the first positioning surface. The side wall of the wear-resistant plate is parallel to and higher than the first positioning surface and forms a second positioning surface. The top surface of the lower mold core is provided with a positioning recess that allows the positioning boss to be inserted and positioned. The side wall of the positioning recess is inclined and can fit against the first positioning surface and / or the second positioning surface to form a third positioning surface.

9. The spring-loaded deep-cavity thin-walled mold as described in claim 8, characterized in that: The protrusion height of the wear-resistant sheet is 1mm-4mm.

10. The spring-loaded deep-cavity thin-walled mold as described in claim 8, characterized in that: There are an even number of first positioning surfaces, and the wear-resistant plates are arranged at intervals on each of the first positioning surfaces.

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