A forming die for a profiled hollow composite component

Abstract

A kind of special-shaped hollow composite component forming die, it includes silica gel upper forming die, silica gel lower forming die, silica gel forming die connecting bolt, core-pulling block, silica gel inner die, special-shaped hollow composite component, component upper forming die, component lower forming die, component forming die connecting bolt;Silica gel upper forming die, silica gel lower forming die and core-pulling block are connected by silica gel forming die connecting bolt, are combined into the forming die cavity of silica gel inner die;Component upper forming die, component lower forming die are closed by component forming die connecting bolt and are combined into the outer cavity die of special-shaped hollow composite component.The utility model adopts the silica gel inner die surface paving composite material continuous fiber prepreg, effectively guarantees the continuity of fiber lay-up, makes component material have designability, enhances the mechanical properties of component structure, so that it can satisfy a variety of adaptive scenarios.

Description

Technical Field

[0001] This utility model belongs to the field of composite material molding mold technology, specifically relating to a molding mold for irregularly shaped hollow composite material components. Background Technology

[0002] Irregularly shaped hollow composite material components have complex geometric shapes, asymmetry, variable cross sections, and multi-cavity structures. Their molding process combines advanced manufacturing technologies of materials science and structural design. They are mainly used in sports equipment, automobiles, wind power and other fields, such as aircraft air intakes, automobile A-pillars, and biomimetic exoskeleton components. In addition to meeting lightweight design requirements, these components also need to meet the performance requirements of high strength and high stiffness.

[0003] Traditional composite material molding processes are difficult to form complex hollow cavity structures, requiring the use of special molds or auxiliary technologies. Currently, the main advanced molding technologies include: 1. 3D printing additive manufacturing; 2. Air bag / foam-assisted molding; 3. Fusible metal core molding.

[0004] The advantage of 3D printing additive manufacturing is that it does not require molds, but the production efficiency is low. The materials and component structures need to be melted / cured and stacked layer by layer. Complex parts need to be supported by additional structures, which takes up printing time, and post-processing further prolongs the overall cycle.

[0005] The two methods of air bag / foam-assisted molding and fusible metal core molding are similar. Both require the first molding of an auxiliary inner mold (foam inner mold or low melting point metal inner mold), and then the composite material is laid on the surface of the inner mold. After laying, it is placed in the female mold for heating and curing. After the component is cured, the inner mold material is heated and melted to destroy or remove it to obtain a hollow composite material component. The disadvantages of these two molding methods are also quite obvious: (1) The inner mold cavity material is disposable and cannot be reused, resulting in high mold cost; (2) When the air bag / foam-assisted molding is cured, the air bag is inflated and pressurized. The inflation pressure is limited and generally does not exceed 0.1 MPa. The composite material component laminate molding has poor density.

[0006] When a fusible metal core mold is formed and cured, it relies solely on the expansion of the metal to pressurize the composite component laminate. The metal has poor expansion properties, resulting in insufficient density of the laminate after molding. Internal pores are not easily expelled, affecting the quality of the component product. Summary of the Invention

[0007] The present invention aims to solve the technical problems existing in the prior art and provide a molding die for irregularly shaped hollow composite material components.

[0008] The above-mentioned technical problems of this utility model are mainly solved by the following technical solution: a molding die for a hollow composite material component of an irregular shape, comprising an upper silicone molding die, a lower silicone molding die, a silicone molding die connecting bolt, a core-pulling block, a silicone inner mold, a hollow composite material component of an irregular shape, an upper molding die for the component, a lower molding die for the component, and a molding die connecting bolt for the component.

[0009] As a preferred option, the combination of the upper silicone molding mold, the lower silicone molding mold, the silicone molding mold connecting bolts, and the core-pulling block is used to mold the inner silicone mold. The silicone liquid has strong fluidity and can be used to prepare the inner silicone mold according to the inner cavity of the irregular component.

[0010] As a preferred embodiment, the core-pulling block and the silicone inner mold constitute the inner cavity mold of the irregular hollow composite material component, and the surface of the mold is covered with prepreg to form the irregular hollow composite material component.

[0011] Preferably, the upper forming mold and the lower forming mold of the component are connected by bolts to form the outer cavity mold of the irregular hollow composite material component, which ensures the outer contour forming of the irregular hollow composite material component.

[0012] As a preferred option, the silicone inner mold has the characteristic of high expansion, which increases the pressure applied to the component prepreg during curing, reduces the internal porosity of the component during molding, and improves the internal quality of the component.

[0013] Preferably, the silicone inner mold is flexible, and when the inner cavity is demolded after the component is formed, the silicone inner mold can be squeezed and deformed, making it easy to demold the inside of the silicone.

[0014] As a preferred option, the silicone inner mold can withstand high temperatures and can be reused after demolding.

[0015] Preferably, the upper forming mold of the component consists of an upper forming mold cavity and positioning guide posts, with the positioning guide posts used for mold closing and positioning.

[0016] Preferably, the lower forming mold of the component consists of a lower forming mold cavity, a positioning guide sleeve, and a mold closing limit block. The positioning guide sleeve is used for mold closing and positioning, and the mold closing limit block is used to control the mold closing gap with the upper forming mold of the component.

[0017] The beneficial effects of this utility model are as follows: The silicone inner mold molding process of this utility model is simple, the silicone liquid has strong fluidity and operability, and can be injected to form various irregular cavity inner molds. At the same time, the injected silicone liquid can be cured at room temperature, which is simple to prepare and has low energy consumption, simplifying the inner mold manufacturing process. Meanwhile, the formed silicone inner mold can withstand high temperature and can be reused after demolding, which greatly reduces the cost of molds and production cycle.

[0018] Compared with air bag / foam assisted molding and low melting point metal core mold, the silicone inner mold used in this utility model has a large expansion coefficient. When heated and cured, the silicone inner mold applies greater pressure to the composite material component layer plate, generally about 0.5 MPa of curing pressure, which can improve the density of the component product and improve the curing quality.

[0019] Compared to 3D printing additive manufacturing, this invention uses a continuous fiber prepreg of composite material to lay on the surface of a silicone inner mold, which effectively ensures the continuity of the fiber layup, makes the component material designable, enhances the mechanical properties of the component structure, and enables it to meet various application scenarios. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the silicone inner mold molding structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the laying of the irregular hollow composite material component and the demolding of the silicone inner mold according to this utility model;

[0022] Figure 3 This is a schematic diagram of the upper and lower forming molds of the component of this utility model being closed.

[0023] Figure 4 This is a schematic diagram of the molding die on the component of this utility model;

[0024] Figure 5 This is a schematic diagram of the lower forming mold of the component of this utility model.

[0025] In the diagram: 1. Upper silicone molding mold; 2. Lower silicone molding mold; 3. Connecting bolts for silicone molding mold; 4. Core-pulling block; 5. Inner silicone mold; 6. Irregularly shaped hollow composite material component; 7. Upper molding mold for component; 8. Lower molding mold for component; 9. Connecting bolts for component molding mold; 71. Mold cavity of upper molding mold for component; 72. Positioning guide post; 81. Mold cavity of lower molding mold for component; 82. Positioning guide sleeve; 83. Mold closing limit block. Detailed Implementation

[0026] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0027] Example: A molding die for irregularly shaped hollow composite material components, such as... Figures 1-5 As shown, a molding die for an irregularly shaped hollow composite material component consists of an upper silicone molding die, a lower silicone molding die, silicone molding die connecting bolts, a core-pulling block, a silicone inner mold, an irregularly shaped hollow composite material component, an upper molding die for the component, a lower molding die for the component, and connecting bolts for the component molding die.

[0028] The upper silicone molding mold, lower silicone molding mold, and core-pulling block are connected by silicone molding mold connecting bolts to form the silicone inner mold molding cavity. After the two-component liquid silicone is thoroughly mixed and stirred, it is poured into the upper silicone molding mold through the injection port to fully fill the cavity. After standing at room temperature, the liquid silicone will solidify and set. Remove the upper and lower silicone molding molds, take out the silicone inner mold blank with the core-pulling block, and clean the cutting injection port and parting surface burrs to obtain the silicone inner mold.

[0029] Furthermore, prepreg required for molding the irregular hollow composite material component is laid on the surface of the silicone inner mold according to the design requirements, and the air pores between the prepreg layers are removed during the laying process. After the laying is completed, the laid irregular hollow composite material component, together with the silicone inner mold, is placed into the lower molding mold of the component. The upper molding mold and the lower molding mold of the component are closed, and the upper and lower molding cavities of the component are connected and fixed with bolts. The molded component after the mold is closed is placed in an oven for heating and curing. During heating, the outer cavity of the irregular hollow composite material component is attached to the upper and lower molding molds of the component, and the silicone inner mold inside the component expands due to heat, applying pressure to the prepreg laminate from the inside to cure. After curing, the irregular hollow composite material component, together with the silicone inner mold, is removed from the upper and lower molding molds of the component. Then the core-pulling block is removed, and the silicone inner mold is taken out to obtain the complete irregular hollow composite material component.

[0030] The upper silicone mold, lower silicone mold, and core-pulling block are connected by silicone mold connecting bolts to form the molding cavity of the silicone inner mold. After the two-component silicone liquid is mixed and stirred, it is poured into the upper silicone mold through the injection port. After the silicone liquid fills the cavity, it is left to stand at room temperature for about 4 hours to solidify and form the silicone inner mold. After solidification, the upper silicone mold, lower silicone mold, and silicone mold connecting bolts are removed, and the silicone inner mold with the core-pulling block is taken out. The injection port and parting surface burrs of the silicone inner mold are then cut and cleaned.

[0031] A layup design is performed on the irregularly shaped hollow composite material component. The prepreg of the composite material is cut and then laid on the surface of the silicone inner mold with a core-pulling block, forming a laminated plate of the irregularly shaped hollow composite material component. The laminated plate, along with the core-pulling block and the silicone inner mold, is placed into the lower molding mold of the component. The upper molding mold and the lower molding mold of the component are then closed by connecting bolts. The molded component is then placed in an oven for heating and curing. During heating, the outer cavity of the irregularly shaped hollow composite material component is attached to the upper and lower molding cavities to ensure the outer contour cavity of the component after molding.

[0032] The silicone inner mold inside the irregularly shaped hollow composite material component expands when heated, applying pressure to the component laminate from the inside for curing. The component laminate completes curing under the action of heating and internal pressure. After curing, the mold is cooled and removed, and the cured irregularly shaped hollow composite material component, along with the internal core-pulling block and silicone inner mold, is taken out from the upper and lower molding molds of the component. When demolding the inside of the irregularly shaped hollow composite material component, the core-pulling block is removed first, and then the flexible and deformable properties of the silicone inner mold are used to pull it out from the inside of the component, completing the preparation of the irregularly shaped hollow composite material component. After demolding, the silicone inner mold can be reused after cleaning.

[0033] The working principle of this utility model is as follows: a molding die for irregular hollow composite material components uses a two-component silicone liquid to prepare a silicone inner mold as the inner mold cavity for prepreg laying, thereby achieving the operability of prepreg laying; by closing the upper and lower molding dies of the component, an outer cavity of the irregular hollow composite material component is formed, ensuring the shaping of the outer surface of the component;

[0034] By utilizing the thermal expansion property of silicone inner mold, the inner side of the laminated plate of irregular hollow composite material component is pressurized and cured to ensure the contour of the inner cavity; at the same time, the flexibility and deformability of silicone inner mold are used to demold the inner cavity mold.

[0035] Finally, it should be noted that the above embodiments are merely representative examples of this utility model. Obviously, this utility model is not limited to the above embodiments and can have many variations. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model should be considered to fall within the protection scope of this utility model.

Claims

1. A molding die for irregularly shaped hollow composite material components, characterized in that, It includes a silicone upper molding mold, a silicone lower molding mold, silicone molding mold connecting bolts, a core-pulling block, a silicone inner mold, an irregularly shaped hollow composite material component, a component upper molding mold, a component lower molding mold, and a component molding mold connecting bolts; The upper silicone molding mold, the lower silicone molding mold, and the core-pulling block are connected by silicone molding mold connecting bolts to form the molding cavity of the inner silicone mold. The upper forming mold and the lower forming mold of the component are connected by bolts to form the outer cavity mold of the irregular hollow composite material component.

2. The molding die for irregularly shaped hollow composite material components as described in claim 1, characterized in that, The inner cavity mold of the irregular hollow composite material component is composed of core-pulling blocks and silicone inner molds, and prepreg is laid on its surface to form the irregular hollow composite material component.

3. The molding die for irregularly shaped hollow composite material components as described in claim 1, characterized in that, The upper forming mold of the component consists of the upper forming mold cavity and the positioning guide post.

4. The molding die for irregularly shaped hollow composite material components as described in claim 1, characterized in that, The lower forming mold of the component consists of the lower forming mold cavity, the positioning guide sleeve, and the mold closing limit block.

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