Hot press forming die

Abstract

The utility model belongs to the technical field of hot-press molds, and particularly relates to a hot-press forming mold which comprises an upper mold frame, a lower mold frame, a heating mechanism and a rubber plate layer. The upper mold frame is provided with an upper mold plate with an outwards-convex mold core, the lower mold frame is provided with a lower mold plate with an inwards-concave mold cavity, and the heating mechanism is installed in the upper mold plate and the lower mold plate and used for heating the surface of the mold core and the inner wall of the mold cavity; the rubber plate layers are respectively arranged on the surfaces of the mold core and the mold cavity and can be used for stress dispersion when a product is extruded, and the heat-resistant temperature is higher than the temperature of the surface of the mold core and the inner wall of the mold cavity; in the mold, the rubber plate layer serves as a low-heat-conduction medium and can slow down heat transfer, a controllable temperature gradient is formed, and heat radiation is reduced to maintain the temperature stability of the mold cavity; and the elastic deformation can disperse stress during mold closing, and the product can recover after being softened, so that the product quality is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of hot pressing mold technology, and in particular relates to a hot pressing molding mold. Background Technology

[0002] Hot pressing is a process that uses heat and pressure to shape materials, and it is widely used in composite materials, plastics, rubber, wood and other fields.

[0003] Traditional hot pressing molding typically involves direct contact between a steel heating plate and a pressure plate on the rubber part. When the core and cavity in the mold have multiple concave and convex structures due to the product's appearance, the thermal conductivity of metal can easily lead to localized overheating due to differences in contact area. When the steel mold is in rigid contact, the pressure is directly transmitted through the metal, which can easily create localized high-pressure areas at the core tip, cavity corners, etc., resulting in internal stress concentration and affecting the dimensional accuracy of the product. Utility Model Content

[0004] The purpose of this utility model is to address the aforementioned technical problems by providing a hot pressing mold that can prevent localized overheating and internal stress concentration during hot pressing, thereby ensuring product quality.

[0005] In view of this, the present invention provides a hot pressing molding die, comprising:

[0006] The upper mold frame is equipped with an upper template, and the upper template has an outwardly protruding core;

[0007] The lower mold frame is equipped with a lower template, and the lower template has a recessed cavity.

[0008] The heating mechanism is installed inside the upper and lower templates and is used to heat the core surface and the inner wall of the cavity.

[0009] The adhesive layer is set on the surface of the core and cavity respectively, and is used to disperse the stress when the product is squeezed;

[0010] The heat resistance temperature of the adhesive layer must be higher than that of the core surface and the inner wall of the cavity.

[0011] In the above technical solution, further:

[0012] A cavity is formed between the cavity and the core to accommodate the product.

[0013] Furthermore, the above technical solution also includes:

[0014] An exhaust mechanism is installed on the upper template and is used to prevent excessive gas accumulation in the chamber due to heating.

[0015] In the above technical solution, further:

[0016] The exhaust mechanism includes an annular channel that surrounds the core within the upper template, a connecting channel for the annular channel to connect to the chamber, and an outlet channel for the annular channel to connect to the outside.

[0017] In the above technical solution, further:

[0018] The connecting channel includes a vertical section that is vertically opened inside the core and a connecting section that connects the vertical section to the annular channel.

[0019] In the above technical solution, the heating mechanism further includes:

[0020] The serpentine channel is set within the upper and lower templates, with an inlet and an outlet formed in both templates.

[0021] The annular channel has a break at the inlet and outlet ends, forming two L-shaped channels, and two outlet channels are respectively connected to the two L-shaped channels.

[0022] In the above technical solution, further:

[0023] Both the upper and lower templates include a substrate layer and a molding layer, and the core and cavity are respectively disposed on the upper and lower templates;

[0024] A sealing assembly is disposed between a substrate layer and a molding layer, and includes sealing channels opened along both sides of a serpentine channel and sealing strips installed within the sealing channels;

[0025] Both the annular channel and the serpentine channel are located between the substrate layer and the molding layer.

[0026] Furthermore, the above technical solution also includes:

[0027] The correction protrusion is installed on the side of the upper template closest to the lower template;

[0028] The correction groove is formed on the side of the upper template close to the upper template and is adapted to the correction protrusion.

[0029] The beneficial effects of this utility model are as follows:

[0030] 1. By using the rubber sheet layer as a low thermal conductivity medium, the rate of heat transfer from metal to rubber can be slowed down. By adjusting the thickness of the rubber sheet, a controllable temperature gradient can be formed to avoid local overheating. At the same time, the rubber sheet layer can also reduce the heat radiation from the mold to the outside, which helps to maintain the stability of the mold cavity temperature. Furthermore, during mold closing, the elastic deformation of the rubber sheet layer can convert rigid pressure into flexible surface contact load, which is evenly distributed on the rubber surface and disperses stress. In addition, after the product softens, its heat resistance temperature is higher than that of the core surface and the inner wall of the cavity, which allows it to return to its original shape and ensure product quality.

[0031] 2. The exhaust mechanism can remove the gas that accumulates in the chamber due to heating, thus avoiding excessive gas accumulation and affecting product quality. Furthermore, the upper template reduces product softening and embedding into the connecting channel. The vertical section of the connecting channel connects to the chamber, which can further reduce product softening and embedding into the connecting channel by gravity.

[0032] 3. By including a substrate layer and a molding layer in both the upper and lower templates, and setting the annular channel, serpentine channel and sealing channel between the substrate layer and the molding layer, the ease of processing the annular channel, serpentine channel and sealing channel is improved. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of this utility model;

[0034] Figure 2 This is a cross-sectional view of the present invention;

[0035] Figure 3 This is a utility model Figure 2 Enlarged view of point A in the middle;

[0036] Figure 4 This is an exploded view of the present invention;

[0037] The markings in the diagram represent: 1. Upper mold frame; 2. Upper template; 20. Substrate layer; 21. Molding layer; 3. Core; 4. Lower mold frame; 5. Lower template; 6. Cavity; 7. Chamber; 8. Annular channel; 9. Connecting channel; 90. Vertical section; 91. Connecting section; 10. Outlet channel; 11. Serpentine channel; 12. Inlet end; 13. Outlet end; 14. Sealing channel; 15. Sealing strip; 16. Correction protrusion; 17. Correction groove; 18. Adhesive plate layer. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0039] Example 1:

[0040] This embodiment provides a hot pressing molding die, including:

[0041] The upper mold frame 1 is equipped with an upper template 2, and the upper template 2 is provided with an outwardly protruding core 3;

[0042] The lower mold frame 4 is equipped with a lower template 5, and the lower template 5 has a recessed cavity 6.

[0043] The heating mechanism is installed inside the upper template 2 and the lower template 5, and is used to heat the surface of the core 3 and the inner wall of the cavity 6;

[0044] The adhesive layer 18 is respectively disposed on the surface of the core 3 and the cavity 6, and is used to disperse the stress when the product is squeezed;

[0045] Among them, the heat resistance temperature of the adhesive layer 18 is higher than that of the surface of the core 3 and the inner wall of the cavity 6;

[0046] Meanwhile, the adhesive layer 18 can be made of materials such as silicone rubber and its modified materials, or fluororubber composite structure, which are conventional choices made according to actual needs in the relevant technical field, and will not be elaborated here.

[0047] As can be seen from this embodiment, by using the rubber sheet layer 18 as a low thermal conductivity medium, the rate of heat transfer from the metal to the rubber can be slowed down. By adjusting the thickness of the rubber sheet, a controllable temperature gradient can be formed to avoid local overheating. At the same time, the rubber sheet layer 18 can also reduce the heat radiation from the mold to the outside, which helps to maintain the stability of the mold cavity temperature. Furthermore, during mold closing, the elastic deformation of the rubber sheet layer 18 can convert rigid pressure into flexible surface contact load, which is evenly distributed on the rubber surface and disperses stress. In addition, after the product softens, its heat resistance temperature is higher than that of the core 3 surface and the inner wall of the cavity 6, which can restore it to its original shape and ensure product quality.

[0048] Example 2:

[0049] This embodiment provides a hot pressing molding die, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0050] A cavity 7 for accommodating the product is formed between the cavity 6 and the core 3.

[0051] As can be seen from this embodiment, the arrangement of chamber 7 facilitates the control of product shape and ensures product quality.

[0052] Example 3:

[0053] This embodiment provides a hot pressing molding die, which, in addition to the technical solutions of the above embodiments, also has the following technical features, and further includes:

[0054] An exhaust mechanism is provided on the upper template 2 and is used to prevent excessive gas accumulation in the chamber 7 due to heating.

[0055] As can be seen from this embodiment, by setting up an exhaust mechanism, the gas that accumulates in chamber 7 due to heating can be discharged, avoiding excessive gas accumulation and thus affecting product quality.

[0056] Example 4:

[0057] This embodiment provides a hot pressing molding die, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0058] The exhaust mechanism includes an annular channel 8 that surrounds the core 3 within the upper template 2, a connecting channel 9 for the annular channel 8 to connect to the chamber 7, and an outlet channel 10 for the annular channel 8 to connect to the outside.

[0059] Among them, there are multiple connecting channels 9, which are opened around the core 3.

[0060] As can be seen from this embodiment, by setting the upper template 2, the softening of the product is reduced and the connecting channel 9 is embedded, thus avoiding the softening of the product and embedding into the connecting channel 9 due to gravity when opening on the lower template 5.

[0061] Furthermore, the design of chamber 7 allows the softened product to flow downwards within chamber 7, further preventing blockage of the connecting channel 9. Additionally, the multiple connecting channels 9 ensure effective exhaust.

[0062] Meanwhile, a core 3 is set on the upper template 2, and the connecting channel 9 is located on the upper template 2, so that even if there are protrusions or dents on the product due to the connecting channel 9, they will only exist on the inside of the product, thus ensuring product quality.

[0063] Example 5:

[0064] This embodiment provides a hot pressing molding die, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0065] The connecting channel 9 includes a vertical section 90 that is vertically opened in the core 3 and a connecting section 91 that connects the vertical section 90 and the annular channel 8.

[0066] As can be seen from this embodiment, by using a vertically arranged vertical section 90 to connect the connecting channel 9 to the cavity 7, the softening of the product into the connecting channel 9 can be further reduced by gravity. Even if a local bulge occurs due to mold closing, after softening and embedding into the vertical section 90, it can still flow out due to gravity in the future, ensuring product quality.

[0067] Example 6:

[0068] This embodiment provides a hot pressing molding die, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the heating mechanism includes:

[0069] The serpentine channel 11 is opened in the upper template 2 and the lower template 5, and an inlet end 12 and an outlet end 13 are formed in the upper template 2 and the lower template 5 respectively;

[0070] Among them, the annular channel 8 forms a break at the inlet end 12 and the outlet end 13, forming two L-shaped channels, and is provided with two outlet channels 10 respectively connected to the two L-shaped channels;

[0071] Meanwhile, the heating mechanism is also connected to a heat medium supply device for circulating in and out, which is existing technology and will not be described in detail here.

[0072] As can be seen from this embodiment, the heating effect of the upper template 2 and the lower template 5 is ensured by the serpentine channel 11, and the annular channel 8 is set with a break at the inlet end 12 and the outlet end 13 of the serpentine channel 11, thereby forming two L-shaped channels. At the same time, the exhaust is discharged through two outlet channels 10 to ensure the exhaust effect, while avoiding the obstruction of the inlet end 12 and the outlet end 13.

[0073] Example 7:

[0074] This embodiment provides a hot pressing molding die, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0075] Both the upper template 2 and the lower template 5 include a substrate layer 20 and a molding layer 21, and the core 3 and the cavity 6 are respectively disposed on the upper template 2 and the lower template 5;

[0076] A sealing assembly is disposed between the substrate layer 20 and the molding layer 21, and includes a sealing channel 14 opened along both sides of the serpentine channel 11 and a sealing strip 15 installed in the sealing channel 14.

[0077] The annular channel 8 and the serpentine channel 11 are both located between the substrate layer 20 and the molding layer 21.

[0078] As can be seen from this embodiment, by including a substrate layer 20 and a molding layer 21 in both the upper template 2 and the lower template 5, and by setting the annular channel 8, the serpentine channel 11 and the sealing channel 14 between the substrate layer 20 and the molding layer 21, the convenience of processing the annular channel 8, the serpentine channel 11 and the sealing channel 14 is improved.

[0079] Example 8:

[0080] This embodiment provides a hot pressing molding die, which, in addition to the technical solutions of the above embodiments, also has the following technical features, and further includes:

[0081] The correction protrusion 16 is installed on the side of the upper template 2 near the lower template 5;

[0082] The correction groove 17 is formed on the side of the upper template 2 close to the upper template 2 and is adapted to the correction protrusion 16.

[0083] As can be seen from this embodiment, by correcting the protrusion 16 and the groove 17, the stability and accuracy of the upper template 2 and the lower template 5 when they are closed can be improved, thus ensuring product quality.

[0084] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A hot pressing molding die, characterized in that, include: The upper mold frame (1) is equipped with an upper template (2), and the upper template (2) is provided with an outwardly protruding core (3); The lower mold frame (4) is equipped with a lower template (5), and the lower template (5) has a recessed cavity (6). The heating mechanism is installed in the upper template (2) and the lower template (5) and is used to heat the surface of the core (3) and the inner wall of the cavity (6); The adhesive layer (18) is respectively set on the surface of the core (3) and the cavity (6), and is used to disperse the stress when the product is squeezed; The heat resistance temperature of the adhesive layer (18) is higher than that of the surface of the core (3) and the inner wall of the cavity (6).

2. The hot pressing forming mold according to claim 1, characterized in that: A cavity (7) for accommodating the product is formed between the cavity (6) and the core (3).

3. The hot pressing mold according to claim 2, characterized in that, Also includes: An exhaust mechanism is provided on the upper template (2) and is used to prevent excessive gas accumulation in the chamber (7) due to heating.

4. The hot pressing forming mold according to claim 3, characterized in that: The exhaust mechanism includes an annular channel (8) opened within the upper template (2) surrounding the core (3), a connecting channel (9) for the annular channel (8) to connect to the chamber (7), and an outlet channel (10) for the annular channel (8) to connect to the outside.

5. The hot pressing forming mold according to claim 4, characterized in that: The connecting channel (9) includes a vertical section (90) vertically opened in the core (3) and a connecting section (91) connecting the vertical section (90) and the annular channel (8).

6. The hot pressing forming mold according to claim 4, characterized in that, The heating mechanism includes: The serpentine channel (11) is opened in the upper template (2) and the lower template (5), and an inlet end (12) and an outlet end (13) are formed in the upper template (2) and the lower template (5) respectively. The annular channel (8) has a break at the inlet end (12) and the outlet end (13) to form two L-shaped channels, and two outlet channels (10) are provided to communicate with the two L-shaped channels respectively.

7. The hot pressing mold according to claim 6, characterized in that: The upper template (2) and the lower template (5) both include a substrate layer (20) and a molding layer (21), and the core (3) and the cavity (6) are respectively disposed on the upper template (2) and the lower template (5); The sealing assembly is disposed between the substrate layer (20) and the molding layer (21), and includes a sealing channel (14) opened along both sides of the serpentine channel (11) and a sealing strip (15) installed in the sealing channel (14). The annular channel (8) and the serpentine channel (11) are both located between the substrate layer (20) and the molding layer (21).

8. The hot pressing mold according to claim 1, characterized in that, Also includes: The correction protrusion (16) is installed on the side of the upper template (2) near the lower template (5); The correction groove (17) is opened on the side of the upper template (2) close to the upper template (2) and is adapted to the correction protrusion (16).

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