Local heat preservation injection mold

Abstract

The invention relates to the field of mold manufacturing, in particular to a local heat preservation injection mold. The mold comprises a forming cavity defined by two mold plates with forming faces, an embedding groove is formed in the forming face of at least one mold plate, a heat insulation block with the heat conductivity coefficient smaller than that of the mold plate is embedded in the embedding groove, the heat insulation block can be provided with an injection hole or directly faces the injection hole and is provided with a forming groove and a heat insulation cavity, and part of the heat insulation block is composed of a main body and a piston. The piston is embedded in the cavity in a sliding mode to form a heat insulation cavity, the cavity size can be changed along with injection molding and cooling operation, and a driving structure composed of a magnet, an electromagnet and an elastic piece drives the piston to slide. The technical effects that local heat preservation of the injection mold is achieved, the quality of formed products is improved, the local temperature is flexibly adjusted, and the requirements of different stages of injection molding and cooling are met are achieved.

Description

Technical Field

[0001] The present application relates to the field of mold manufacturing, and in particular to a locally heat-insulated injection mold. Background Art

[0002] Injection molding, as a key manufacturing process, is widely used across various fields in modern industrial production. With the continuous development of the manufacturing industry, the demand for injection-molded products has become increasingly diverse and complex, driving the continuous advancement of injection molding technology. Injection molding can efficiently produce plastic products of various shapes and sizes, meeting the needs of various industries for parts and products, improving production efficiency and ensuring consistent product quality. Injection-molded products play a key role in numerous industries, including automotive, electronics, and home appliances, promoting industrial development and upgrading.

[0003] In the field of injection molding, the traditional method for achieving product formation is to inject molten material into a mold cavity enclosed by a mold plate. When dealing with complex or delicate products, this is often done by adjusting the injection molding machine parameters, such as increasing injection pressure and speed, to enhance the molten material's ability to fill the mold cavity. Furthermore, mold temperature control is performed to a certain extent, such as using a heating device to increase the overall mold temperature to improve the fluidity of the molten material. Furthermore, the mold's runner design is optimized to ensure smoother flow of the molten material into all areas of the mold cavity.

[0004] However, these conventional methods have significant drawbacks. For complex or thin-structured products, even with these measures, the molten material in the molding cavity will still cool rapidly upon contact with the low-temperature mold, severely affecting its fluidity and ultimately negatively impacting product quality. Summary of the Invention

[0005] In order to improve the fluidity of the molten material in the molding cavity, the present application provides a locally heat-insulated injection mold.

[0006] The present application provides a local heat-insulating injection mold that adopts the following technical solution: A local heat-insulating injection mold, comprising a template and a heat-insulating block. There are two templates, each of which has a molding surface. When the two templates are in a mold-clamping state, the two molding surfaces enclose a molding cavity. At least one of the templates is provided with an embedding groove, and the embedding groove is located at the forming surface. The heat insulation block is embedded in the embedding groove, and the thermal conductivity of the heat insulation block is smaller than the thermal conductivity of the template.

[0007] By adopting the above technical solution and utilizing the characteristic that the thermal conductivity of the insulation block is smaller than that of the template, the heat transferred from the molten material in the molding cavity to the insulation block can be reduced, thereby avoiding the molten material from cooling rapidly due to contact with the low-temperature mold, ensuring the fluidity of the molten material, and thus improving product quality.

[0008] Preferably, the thermal insulation block is provided with an injection hole or the thermal insulation block is directly facing the injection hole.

[0009] By adopting the above technical solution, the insulation block is provided with an injection hole or facing the injection hole, which enables the molten material to pass through the insulation area of the insulation block before entering the molding cavity, further ensuring the fluidity of the molten material when entering the molding cavity.

[0010] Preferably, the thermal insulation block has a molding groove, and the molding groove is connected to the molding cavity.

[0011] By adopting the above technical solutions, the molding requirements of product detail structures can be met and the integrity and accuracy of product molding can be improved.

[0012] Preferably, the insulation block has an insulation cavity.

[0013] By adopting the above technical solution, the thermal conductivity of the gas is poor, and the insulation block has an insulation cavity, which can further reduce the rate at which heat in the molding cavity is dissipated to the insulation block, better maintain the temperature of the molten material in the molding cavity, and avoid the molten material from cooling rapidly due to contact with the low-temperature mold, thereby improving the fluidity of the molten material and ensuring product quality.

[0014] Preferably, the thermal insulation block comprises a main body and a piston. The main body is embedded in the embedding groove, and the main body is provided with a sliding groove. The piston is slidably embedded in the chute, and the surface of the piston facing the chute bottom, the chute bottom and the chute wall together form a heat-insulating cavity; When molten material is injected into the molding cavity, the piston is used to slide to reduce the volume of the insulation cavity. When the template is cooled, the piston is used to slide to increase the volume of the insulation cavity.

[0015] By adopting the above technical solution, when injecting molten material into the molding cavity, the piston is used to slide to reduce the volume of the insulation cavity. The piston does work on the gas in the insulation cavity, causing the gas in the insulation cavity to heat up and reducing the rate at which heat in the molding cavity is dissipated to the insulation block.

[0016] After molding is completed, when the template (product) is cooled, the piston is used to slide to increase the volume of the insulation cavity. The gas in the insulation cavity does work on the piston, causing the gas in the insulation cavity to cool down and increase the rate at which heat in the molding cavity (product) is dissipated to the insulation block.

[0017] Preferably, one end of the main body is used for forming products, and the bottom of the chute is located at one end of the main body.

[0018] By adopting the above technical solution, the heat insulation cavity is brought close to the molding cavity, the local thermal insulation effect is enhanced, and the quality of the molded product is better guaranteed.

[0019] Preferably, it also includes a driving structure, The driving structure is used to drive the piston to slide.

[0020] By adopting the above technical solution, the driving structure drives the piston to slide, which can control the piston movement more accurately and efficiently, thereby better adjusting the volume of the insulation cavity, further optimizing the temperature control during the molding process, and ensuring product quality.

[0021] Preferably, the driving structure includes a magnet and an electromagnet, The magnet is connected to the piston, The electromagnet is connected to the template or the main body.

[0022] By adopting the above technical solution, electromagnetic force is used to drive the piston to slide, thereby achieving effective control of the volume of the insulation cavity, and then flexibly adjusting the insulation and cooling effects during the injection molding process to ensure product molding quality.

[0023] Preferably, the driving structure further includes an elastic member. The elastic member is connected between the piston and the main body, and the elastic member enables the piston to slide to increase the volume of the heat insulation cavity.

[0024] By adopting the above technical solution, when the electromagnet is powered off, the elastic member can be used to drive the piston to slide to increase the volume of the heat insulation cavity.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. Embedding a heat-insulating block with a lower thermal conductivity than the template in the groove on the molding surface of the template can reduce the contact of the molten material with the low-temperature mold in the molding cavity and improve the fluidity of the molten material; 2. Due to the improved fluidity of the molten material, the injection molding effect of complex or thin-structured products can be improved, thereby improving product quality; 3. The heat insulation block is used to locally insulate the molding cavity to avoid rapid cooling of the molten material, which to a certain extent reduces the energy consumption and other problems caused by conventional means. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of an injection molded product.

[0027] Figure 2 It is a schematic diagram of the overall structure of a local insulation injection mold.

[0028] Figure 3 This is a schematic diagram of the template, used to illustrate the bezel.

[0029] Figure 4 It is a schematic diagram of the formwork and insulation blocks; Figure 5 This is a cross-sectional view of the injection mold, used to show the drive structure.

[0030] Explanation of the accompanying reference numerals: 1. Template; 11. Molding surface; 12. Embedded groove; 2. Insulation block; 21. Molding groove; 22. Main body; 23. Piston; 24. Slide groove; 3. Injection hole; 4. Driving structure; 41. Magnet; 42. Electromagnet; 43. Elastic part. DETAILED DESCRIPTION

[0031] The present application is further described in detail below with reference to the accompanying drawings.

[0032] Reference Figure 1 , an injection molded product has a large number of reinforcing ribs on its surface.

[0033] Reference Figure 2 and Figure 3 , an embodiment of the present application discloses a locally heat-insulated injection mold, including a template 1.

[0034] The template 1 is provided with a molding surface 11. When the two templates 1 are in a mold-clamping state, the two molding surfaces 11 enclose a molding cavity.

[0035] Reference Figure 3 and Figure 4 , the injection mold also includes an insulation block 2.

[0036] At least one template 1 is provided with an embedding groove 12, located on the molding surface 11. An insulation block 2 is embedded in the embedding groove 12. Specifically, one end of the insulation block 2 is provided with a molding groove 21, which is connected to the molding cavity; the other end of the insulation block 2 is embedded in the embedding groove 12. The insulation block 2 is provided with an injection hole 3, or the insulation block 2 is directly opposite the injection hole 3. The thermal conductivity of the insulation block 2 is lower than that of the template 1. The injection hole 3 is used to inject molten material into the molding cavity.

[0037] In the drawings, only one template 1 is provided with an embedding groove 12 , and only one heat-insulating block 2 is provided with an injection hole 3 .

[0038] Reference Figure 5 The thermal insulation block 2 includes a main body 22 and a piston 23.

[0039] One end of the main body 22 is provided with a molding groove 21, allowing one end of the main body 22 to be used for forming the product; the other end of the main body 22 is embedded in the embedding groove 12. A slide groove 24 is also provided on the other end of the main body 22, with the bottom of the slide groove 24 located at one end of the main body 22. A piston 23 slides within the slide groove 24. The surface of the piston 23 facing the bottom of the slide groove 24, the bottom of the slide groove 24, and the walls of the slide groove 24 form a sealed, heat-insulating chamber. For example, the piston 23 forms a sliding seal against the inner wall of the slide groove 24, isolating the heat-insulating chamber from the outside world.

[0040] The injection mold further comprises a drive structure 4 .

[0041] When the molten material is injected into the molding cavity, the driving structure 4 is used to drive the piston 23 to approach the bottom of the chute 24 to reduce the volume of the insulation cavity; When the template 1 is cooled, the driving structure 4 is used to drive the piston 23 away from the bottom of the sliding groove 24 to increase the volume of the heat insulation cavity.

[0042] The driving structure 4 includes a magnet 41 , an electromagnet 42 and an elastic member 43 .

[0043] The magnet 41 is fixedly connected to the piston 23. The electromagnet 42 is connected to the template 1 or the main body 22. When the electromagnet 42 is energized, the magnetic force between the electromagnet 42 and the magnet 41 drives the piston 23 to approach the bottom of the chute 24.

[0044] An elastic member 43 is connected between the piston 23 and the main body 22. This member allows the piston 23 to slide, increasing the volume of the insulation chamber. When the electromagnet 42 is de-energized, the elastic force of the elastic member 43 forces the piston 23 away from the bottom of the chute 24. The elastic member 43 can be a spring.

[0045] The implementation principle of a locally insulated injection mold in an embodiment of the present application is as follows: by setting the insulation block 2, the cooling rate of the molten material in the molding cavity is effectively reduced, its fluidity is guaranteed, and the product quality is improved. The various structural designs of the insulation block 2, such as the injection hole 3, the molding groove 21, the insulation cavity and the slidable piston 23, further optimize the insulation effect and molding performance. The addition of the drive structure 4 makes the sliding of the piston 23 more controllable, and the volume of the insulation cavity can be flexibly adjusted according to the different stages of the injection molding process to adapt to different process requirements. Compared with traditional injection molds, this mold has obvious advantages when dealing with complex or thin-structured products, reduces product quality problems caused by rapid cooling of molten materials, and improves production efficiency and product yield.

[0046] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A local heat-insulating injection mold, characterized in that: It includes a template (1) and a heat-insulating block (2), Two templates (1) are provided, and each template (1) is provided with a molding surface (11). When the two templates (1) are in a mold-clamping state, the two molding surfaces (11) enclose a molding cavity. At least one of the templates (1) is provided with an embedding groove (12), wherein the embedding groove (12) is located at the molding surface (11). The heat insulating block (2) is embedded in the embedding groove (12), and the heat conductivity coefficient of the heat insulating block (2) is smaller than the heat conductivity coefficient of the template (1).

2. The local heat-insulating injection mold according to claim 1, characterized in that: The heat insulation block (2) is provided with an injection hole (3), or the heat insulation block (2) faces the injection hole (3).

3. The local heat-insulating injection mold according to claim 1, characterized in that: The heat insulation block (2) has a molding groove (21), and the molding groove (21) is connected to the molding cavity.

4. The local heat-insulating injection mold according to claim 1, characterized in that: The thermal insulation block (2) has a thermal insulation cavity.

5. The local heat-insulating injection mold according to claim 1, characterized in that: The heat-insulating block (2) comprises a main body (22) and a piston (23). The main body (22) is embedded in the embedding groove (12), and the main body (22) is provided with a sliding groove (24). The piston (23) is slidably embedded in the slide groove (24), and the surface of the piston (23) facing the bottom of the slide groove (24), the bottom of the slide groove (24) and the wall of the slide groove (24) form a heat-insulating cavity; When the molten material is injected into the molding cavity, the piston (23) is used to slide to reduce the volume of the insulation cavity. When the template (1) is cooled, the piston (23) is used to slide to increase the volume of the insulation cavity.

6. The local heat-insulating injection mold according to claim 5, characterized in that: One end of the main body (22) is used for forming a product, and the bottom of the chute (24) is located at one end of the main body (22).

7. The local heat-insulating injection mold according to claim 5, characterized in that: Also includes a drive structure (4), The driving structure (4) is used to drive the piston (23) to slide.

8. The local heat-insulating injection mold according to claim 7, characterized in that: The driving structure (4) includes a magnet (41) and an electromagnet (42). The magnet (41) is connected to the piston (23), The electromagnet (42) is connected to the template (1) or the main body (22).

9. The local heat-insulating injection mold according to claim 8, characterized in that: The driving structure (4) further includes an elastic member (43), The elastic member (43) is connected between the piston (23) and the main body (22), and the elastic member (43) enables the piston (23) to have a tendency to slide to increase the volume of the insulation cavity.

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