A mould for the compression moulding of prepreg without the need for preforming

Abstract

The utility model discloses a kind of prepreg mould pressing mould without pre-shaping, belong to prepreg mould pressing mould technical field.A kind of prepreg mould pressing mould without pre-shaping, including base frame and the mould set of being set on base frame, air guide mechanism is equipped in the mould set, vacuum system is equipped on the base frame, the vacuum system is used for extracting air in mould set by air guide mechanism, wherein, the mould set includes lower mould and upper mould, the lower mould is made of at least two modules and is slidably connected on base frame;The utility model can save traditional independent pre-shaping process, directly shorten production cycle, and dynamic mould cavity adjustment reduces fiber disturbance, air guide structure cooperates vacuum system to effectively reduce bubble defect, reduce finished product porosity, compatible asymmetric, complex layup design such as curved surface, especially suitable for complex curved surface or variable cross-section structure prepreg product forming.

Description

Technical Field

[0001] This utility model relates to the field of prepreg molding technology, and in particular to a prepreg molding die that does not require pre-forming. Background Technology

[0002] In the field of prepreg molding, traditional processes usually require a separate pre-forming process to ensure the layup stability of the prepreg during the molding process. However, this process significantly extends the production cycle and reduces production efficiency. At the same time, fiber disturbance is prone to occur during the pre-forming process, affecting the quality of the product. Furthermore, during the mold closing and curing stages, incomplete gas removal from the mold can easily lead to bubble defects, resulting in a high porosity of the finished product.

[0003] Furthermore, traditional molds have poor compatibility with complex layup designs such as asymmetry and curved surfaces, making it difficult to meet the molding requirements of complex prepreg products. Insufficient temperature control precision in the molds can also affect resin flowability and curing effect, thereby restricting the quality and production efficiency of prepreg molded products. Utility Model Content

[0004] The purpose of this invention is to solve the problems mentioned in the background art and to provide a prepreg molding die that does not require a pre-form.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A prepreg molding die that does not require pre-formation includes a base frame and a die assembly mounted on the base frame. The die assembly is equipped with an air guiding mechanism, and the base frame is equipped with a vacuum system. The vacuum system is used to extract air from the die assembly through the air guiding mechanism.

[0007] The mold assembly includes a lower mold and an upper mold. The lower mold consists of at least two modules, both of which are slidably connected to the base frame.

[0008] Preferably, the air guiding mechanism includes an air guiding groove, the lower mold has a lower mold cavity, the upper mold has an upper mold cavity, and the air guiding groove is disposed on the lower mold cavity and the upper mold cavity.

[0009] Preferably, the vacuum system includes a vacuum pump, the upper mold is provided with an upper air inlet and outlet, the lower mold is provided with a lower air inlet and outlet, and the vacuum pump is connected to the air guide groove of the upper mold cavity through the upper air inlet and outlet and to the air guide groove of the lower mold cavity through the lower air inlet and outlet.

[0010] Preferably, the base frame is provided with a guide rail, and the lower mold is slidably connected to the guide rail.

[0011] Preferably, the dimensions of the air guide groove are 0.1-0.3 mm in depth and 0.2-0.4 mm in width.

[0012] Preferably, the surface of the air guide groove is covered with a porous air guide membrane.

[0013] Compared with the prior art, this utility model provides a prepreg molding die that does not require pre-formation, which has the following advantages:

[0014] The parts not covered in this device are the same as or can be implemented using existing technologies. This utility model can eliminate the traditional independent pre-forming process, directly shorten the production cycle, and the dynamic mold cavity adjustment reduces fiber disturbance. The air guiding structure and vacuum system effectively reduce bubble defects and reduce the porosity of the finished product. It is compatible with complex layup designs such as asymmetry and curved surfaces, and is especially suitable for molding prepreg products with complex curved surfaces or variable cross-sections. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a prepreg molding die that does not require pre-formation, as proposed in this utility model.

[0016] Figure 2 This is a schematic diagram of the lower mold of a prepreg molding die that does not require pre-formation, as proposed in this utility model.

[0017] Figure 3 This is a schematic diagram of the upper mold of a prepreg molding die that does not require pre-formation, as proposed in this utility model.

[0018] In the diagram: 1. Base frame; 101. Guide rail; 2. Lower mold; 201. Lower mold cavity; 202. Lower air inlet / outlet; 3. Upper mold; 301. Upper air inlet / outlet; 302. Upper mold cavity; 4. Vacuum pump. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Example 1:

[0021] Reference Figure 1-3 A prepreg molding die that does not require pre-formation includes a base frame 1 and a die assembly disposed on the base frame 1. The die assembly is provided with an air guiding mechanism, and the base frame 1 is provided with a vacuum system. The vacuum system is used to extract air from the die assembly through the air guiding mechanism.

[0022] The mold assembly includes a lower mold 2 and an upper mold 3. The lower mold 2 consists of at least two modules, both of which are slidably connected to the base frame 1. The modules are connected to the base frame 1 via a linear precision slide rail or a hydraulic mechanism to drive the modules. A displacement sensor is installed on the base frame 1 to detect the movement distance of the modules and ensure precision. A guide rail 101 is provided on the base frame 1, and the lower mold 2 is slidably connected to the guide rail 101.

[0023] In the initial state, the module unfolds, and the lower mold 2 is not located below the upper mold 3, which facilitates the laying of the prepreg. After the laying is completed, multiple modules are closed simultaneously, allowing the modules to slide on the guide rail 101. At this time, the mold is closed step by step to position and pre-compact the prepreg.

[0024] The air guiding mechanism includes an air guiding groove. The lower mold 2 is provided with a lower mold cavity 201, and the upper mold 3 is provided with an upper mold cavity 302. The air guiding groove is provided on the lower mold cavity 201 and the upper mold cavity 302. The dimensions of the air guiding groove are 0.1-0.3mm deep and 0.2-0.4mm wide. The surface of the air guiding groove is covered with a porous air guiding membrane, and the porous air guiding membrane is made of polytetrafluoroethylene.

[0025] The vacuum system includes a vacuum pump 4, an upper inlet / outlet 301 on the upper mold 3, and a lower inlet / outlet 202 on the lower mold 2. The vacuum pump 4 is connected to the air guide groove of the upper mold cavity 302 through the upper inlet / outlet 301 and to the air guide groove of the lower mold cavity 201 through the lower inlet / outlet 202.

[0026] With the help of a vacuum system and air guide grooves, gas can be discharged during mold closing to avoid the generation of air bubbles. At the same time, the air guide grooves can limit the sliding of the prepreg material, improve stability, and replace traditional pre-shaped tooling.

[0027] Example 2:

[0028] Reference Figure 1-3 A prepreg molding die that does not require pre-formation includes a base frame 1 and a die assembly disposed on the base frame 1. The die assembly is provided with an air guiding mechanism, and the base frame 1 is provided with a vacuum system. The vacuum system is used to extract air from the die assembly through the air guiding mechanism.

[0029] The mold assembly includes a lower mold 2 and an upper mold 3. The lower mold 2 consists of at least two modules, both of which are slidably connected to the base frame 1. The modules are connected to the base frame 1 via a linear precision slide rail or a hydraulic mechanism to drive the modules. A displacement sensor is installed on the base frame 1 to detect the movement distance of the modules and ensure precision. A guide rail 101 is provided on the base frame 1, and the lower mold 2 is slidably connected to the guide rail 101.

[0030] In the initial state, the module unfolds, and the lower mold 2 is not located below the upper mold 3, which facilitates the laying of the prepreg. After the laying is completed, multiple modules are closed simultaneously, allowing the modules to slide on the guide rail 101. At this time, the mold is closed step by step to position and pre-compact the prepreg.

[0031] The air guiding mechanism includes an air guiding groove. The lower mold 2 is provided with a lower mold cavity 201, and the upper mold 3 is provided with an upper mold cavity 302. The air guiding groove is provided on the lower mold cavity 201 and the upper mold cavity 302. The dimensions of the air guiding groove are 0.1-0.3mm deep and 0.2-0.4mm wide. The surface of the air guiding groove is covered with a porous air guiding membrane, and the porous air guiding membrane is made of polytetrafluoroethylene.

[0032] The vacuum system includes a vacuum pump 4, an upper inlet / outlet 301 on the upper mold 3, and a lower inlet / outlet 202 on the lower mold 2. The vacuum pump 4 is connected to the air guide groove of the upper mold cavity 302 through the upper inlet / outlet 301 and to the air guide groove of the lower mold cavity 201 through the lower inlet / outlet 202.

[0033] With the help of a vacuum system and air guide grooves, gas can be discharged during mold closing to avoid the generation of air bubbles. At the same time, the air guide grooves can limit the sliding of the prepreg material, improve stability, and replace traditional pre-shaped tooling.

[0034] Furthermore, an elastic silicone pressure ring with built-in carbon fiber heating wire is set at the edge of the mold operation. Driven by air or hydraulic pressure, it can preferentially press the edge of the prepreg when the mold is closed to achieve cavity boundary sealing and prevent resin overflow. The edge is also locally heated to 80°C to allow the resin to initially gel, complete the edge pre-curing and shaping, and stabilize the layup edge in the early stage of molding.

[0035] The mold is also equipped with a multi-zone temperature control system, with the temperature of the central curing zone being 130-170℃ and the temperature of the edge curing zone being 60-100℃. Independent temperature control forms a temperature gradient, and the resin flow is controlled by the gradient difference, allowing the prepreg to self-form in the mold cavity. The central zone ensures the final curing strength, and the edge zone achieves pre-curing and edge locking.

[0036] This invention eliminates the traditional independent pre-forming process, directly shortens the production cycle, and the dynamic mold cavity adjustment reduces fiber disturbance. The air guiding structure and vacuum system effectively reduce bubble defects and reduce the porosity of the finished product. It is compatible with complex layup designs such as asymmetry and curved surfaces, and is especially suitable for molding prepreg products with complex curved surfaces or variable cross-sections.

[0037] 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. A prepreg compression moulding tool without pre-forming, characterized in that, It includes a base frame (1) and a mold assembly disposed on the base frame (1). The mold assembly is provided with an air guiding mechanism, and the base frame (1) is provided with a vacuum system. The vacuum system is used to extract air from the mold assembly through the air guiding mechanism. The mold assembly includes a lower mold (2) and an upper mold (3). The lower mold (2) is composed of at least two modules, both of which are slidably connected to the base frame (1).

2. The prepreg molding die without pre-form as described in claim 1, characterized in that, The air guiding mechanism includes an air guiding groove. The lower mold (2) is provided with a lower mold cavity (201), and the upper mold (3) is provided with an upper mold cavity (302). The air guiding groove is provided on the lower mold cavity (201) and the upper mold cavity (302).

3. The prepreg molding die without pre-form as described in claim 2, characterized in that, The vacuum system includes a vacuum pump (4), the upper mold (3) is provided with an upper air inlet / outlet (301), the lower mold (2) is provided with a lower air inlet / outlet (202), the vacuum pump (4) is connected to the air guide groove of the upper mold cavity (302) through the upper air inlet / outlet (301), and is connected to the air guide groove of the lower mold cavity (201) through the lower air inlet / outlet (202).

4. The prepreg molding die without pre-form as described in claim 1, characterized in that, The base frame (1) is provided with a guide rail (101), and the lower mold (2) is slidably connected to the guide rail (101).

5. The prepreg molding die without pre-form as described in claim 2, characterized in that, The dimensions of the air guide groove are 0.1-0.3 mm deep and 0.2-0.4 mm wide.

6. The prepreg molding die without pre-form as described in claim 5, characterized in that, The surface of the air guide groove is covered with a porous air guide membrane.

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