A wedge linkage side press mold for composite material forming

Abstract

This invention discloses a wedge-shaped linkage side-pressure mold for composite material molding, including an upper mold and a lower mold, a side-pressure mechanism, and a linkage component. The side-pressure mechanism has an integrally formed fiber-reinforced composite layer on both the pressing surface of the side-pressure plate and the supporting surface of the pressing part. The fiber-reinforced composite layer uses metal or ceramic as a matrix, in which reinforcing fibers are dispersed. The reinforcing fibers are selected from a combination of carbon fiber and glass fiber, and their type is consistent with the type of reinforcing fibers in the product to be molded. When the upper mold closes to the lower mold, the linkage component drives the side-pressure plate to move towards the side of the mold cavity through an inclined transmission structure, so as to cooperate with the pressing part to press the product in the mold cavity from both sides. This invention converts the vertical clamping force of the upper mold into the lateral movement of the side-pressure plate. This transmission process ensures that the lateral clamping force and the clamping force have a definite proportional relationship, thereby maintaining basic stability throughout the molding process and avoiding the nonlinear increase problem of side pressure caused by changes in compression of traditional nitrogen springs.

Description

Technical Field

[0001] The present invention particularly relates to a wedge-shaped linkage side pressure mold for molding composite materials. Background Technology

[0002] Fiber-reinforced polymer (FRP) composites are widely used in aerospace, high-end automobiles, and sporting goods due to their advantages such as high specific strength, high specific modulus, and strong designability. For many load-bearing structural components, such as joints, flanges, and localized reinforcement areas, it is often necessary to form a dense uptake zone in specific locations through compression molding processes, which is much larger than the original thickness of the blank, in order to meet higher mechanical performance requirements.

[0003] Currently, most molds for this type of upsetting employ a lateral elastic pressure mechanism (such as a nitrogen spring). The working principle is as follows: during mold closing, the nitrogen spring pushes the side pressure block to press the blank from the side, restricting its lateral flow and forcing the material to fill vertically to achieve the thickening. However, this traditional solution has revealed several inherent defects in practical applications, severely limiting the upper limits of product quality and performance:

[0004] The output force of a nitrogen spring increases non-linearly with its compression stroke. During the molding process, as the material softens due to heat, the resin flows, and the fiber network deforms, the lateral reaction force continuously changes, causing the nitrogen spring to be further compressed, and the lateral pressure it provides increases sharply. This continuously increasing and unstable lateral pressure can easily cause excessive shearing or compression damage to the continuous reinforcing fibers (i.e., "fiber damage"), which is the main cause of "three-damage" defects such as tensile and compressive damage in products, leading to a decline in mechanical properties.

[0005] The curing of fiber-reinforced composites requires high temperatures (typically 120°C-180°C or higher), and the coefficient of thermal expansion of the mold steel is approximately 11 × 10⁻⁶. -6 The thermal expansion coefficient (°C) of the mold body (including the side pressure mechanism) is much greater than that of carbon fiber composites along the fiber direction (approaching zero or even negative). At the curing temperature, the mold body undergoes significant thermal expansion, leading to an increase in the actual working gap between the side pressure block and the corresponding support surface. Consequently, the lateral clamping force is severely attenuated or even completely lost. This "thermally induced pressure relaxation" effect directly results in insufficient compaction of the product during the high-temperature curing stage, leading to a series of quality problems such as high porosity, low fiber volume content, unstable dimensions in the uptake zone, and weak interlayer bonding. Summary of the Invention

[0006] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a wedge-shaped linkage side-pressure die for composite material molding.

[0007] A wedge-shaped linkage side-pressure mold for molding composite materials includes an upper mold and a lower mold. The lower mold has a cavity for molding the product. Side-pressure mechanisms are respectively provided on both sides of the upper mold. Each side-pressure mechanism includes a linkage assembly, which is movably mounted on the upper mold and has a first part that moves along a first direction when the mold is closed and a second part that can move along a second direction different from the first direction. The first part and the second part are drively connected. The side-pressure mechanism also includes a transmission block disposed on the upper mold and a side-pressure plate slidably mounted on the transmission block. An inclined surface transmission structure is provided between the transmission block and the second part of the linkage assembly. The two sides of the lower mold are respectively... A pressing part is fixed; both the pressing surface of the side pressing plate and the supporting surface of the pressing part are provided with an integrally formed fiber-reinforced composite layer; the fiber-reinforced composite layer uses metal or ceramic as the matrix, in which reinforcing fibers are dispersed; the reinforcing fibers are selected from a combination of carbon fiber and glass fiber, and their type is consistent with the type of reinforcing fibers in the product to be molded; when the upper mold closes to the lower mold, the first part of the linkage component moves along the first direction under the action of mold closing, and drives the second part to move along the second direction, thereby driving the side pressing plate to move toward the side of the mold cavity through the inclined surface transmission structure, so as to cooperate with the pressing part to press the product in the mold cavity from both sides.

[0008] Preferably, the first direction is a vertical direction, the second direction is a horizontal direction, and the second direction is perpendicular to the mold closing direction.

[0009] Preferably, the linkage component includes a first wedge block that can slide in a vertical direction and a second wedge block that can slide in a horizontal direction, wherein the first wedge block and the second wedge block are engaged by a mutually cooperating inclined surface transmission.

[0010] Preferably, the inclined plane transmission structure includes a first inclined plane disposed on the second wedge block and a second inclined plane disposed on the transmission block. The first inclined plane and the second inclined plane cooperate with each other so that the horizontal movement of the second wedge block can be converted into the lateral movement of the side pressure plate.

[0011] Preferably, the upper mold is provided with a travel channel for the first wedge block to move up and down.

[0012] Preferably, the first wedge block is provided with an anti-detachment part, which cooperates with the upper mold to limit the movement stroke of the first wedge block.

[0013] Preferably, a reset elastic element is provided between the second wedge block and the upper mold, and the reset elastic element is used to drive the second wedge block to reset.

[0014] Preferably, an elastic buffer is installed on the lower mold. The elastic buffer has a retractable push rod. When the upper mold and the lower mold are closed, the push rod contacts the upper mold and provides a buffering effect through the elastic buffer.

[0015] Preferably, a second spring is provided between the side pressure plate and the upper mold.

[0016] Preferably, the thickness of the fiber-reinforced composite layer is 0.1 mm to 2.0 mm, and the volume percentage of the reinforcing fiber in the composite layer is 5% to 40%.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This invention utilizes a purely mechanical "wedge block linkage-inclined surface transmission" mechanism to directly convert the vertical clamping force of the upper mold into the lateral movement of the side pressure plate. This transmission process features a defined stroke and rigid transmission, ensuring a definite proportional relationship between the lateral clamping force and the clamping force. This maintains basic stability throughout the molding process, avoiding the nonlinear increase in lateral pressure caused by compression variations in traditional nitrogen springs. This provides primary mechanical protection for protecting fiber integrity and achieving uniform compaction. By setting fiber-reinforced composite layers on the clamping surfaces of the side pressure plate and the support surfaces of the extrusion blocks, and ensuring that the type of reinforcing fiber matches the product, this solution creatively achieves active matching of the thermal expansion behavior between the key working surfaces of the mold and the product. From room temperature to the high-temperature curing stage, the coefficient of thermal expansion of the mold's working surfaces is significantly reduced, with minimal difference from the product's thermal expansion. This ensures that the clamping gap remains essentially unchanged at high temperatures, completely eliminating the lateral pressure attenuation caused by mold thermal expansion, allowing the material to continue to be compacted stably during the crucial curing stage. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this embodiment, the accompanying drawings used in the embodiment will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a wedge-shaped linkage side pressure piercing die according to this application. Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the structure of a wedge-shaped linkage side pressure piercing die according to this application. Figure 2 ;

[0022] Figure 3 This is a schematic diagram of the structure of a wedge-shaped linkage side pressure piercing die according to this application. Figure 3 ;

[0023] Figure 4 This is a schematic diagram of the structure of a wedge-shaped linkage side pressure piercing die according to this application. Figure 4 ;

[0024] Figure 5 This is a schematic diagram of the structure of a wedge-shaped linkage side pressure piercing die according to this application. Figure 5 ;

[0025] Figure 6 This is a schematic diagram of the structure of a wedge-shaped linkage side pressure piercing die according to this application. Figure 6 ;

[0026] Figure 7 This is a schematic diagram of the structure of a wedge-shaped linkage side pressure piercing die according to this application. Figure 7 ;

[0027] Figure 8 This is a schematic diagram of the fiber-reinforced composite layer of this application. Detailed Implementation

[0028] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0029] The orientation shown in the accompanying drawings should not be construed as limiting the specific scope of protection of the present invention, but is only for reference and understanding of preferred embodiments. The product components shown in the figures can be changed in position, increased in number, or simplified in structure.

[0030] The “connection” described in the specification and the “connection” relationship between the components shown in the accompanying drawings can be understood as a fixed connection, a detachable connection, or a connection that forms an integral unit; it can be a direct connection or a connection through an intermediate medium. Those skilled in the art can understand the connection relationship according to the specific circumstances and can derive different implementation methods such as screwing, riveting, welding, snap-fitting, or embedding to suitably replace the connection.

[0031] The directional terms such as up, down, left, right, top, and bottom mentioned in the instruction manual and the directions shown in the attached drawings indicate that the components can directly contact each other or contact each other through other features; for example, "up" can mean directly above or diagonally above, or it simply means above other objects; other directions can be understood by analogy.

[0032] The materials used to manufacture solid-shaped parts as shown in the specification and drawings may be metallic, non-metallic, or other synthetic materials. The machining processes used for solid-shaped parts may include stamping, forging, casting, wire cutting, laser cutting, injection molding, CNC milling, 3D printing, machining, etc. Those skilled in the art may adapt or combine the above materials and manufacturing processes according to different processing conditions, costs, and precision requirements.

[0033] A wedge-shaped linkage side-pressure mold for molding composite materials includes an upper mold 1 and a lower mold 2. The lower mold 2 has a mold cavity 3 for molding products. Side-pressure mechanisms are respectively provided on both sides of the upper mold 1. The side-pressure mechanism includes a linkage assembly. The linkage assembly is movably mounted on the upper mold 1 and has a first part that moves along a first direction when the mold is closed and a second part that can move along a second direction different from the first direction. The first part and the second part are connected by a transmission. The side-pressure mechanism also includes a transmission block 4 disposed on the upper mold 1 and a side-pressure plate 5 slidably mounted on the transmission block 4. An inclined transmission structure is provided between the transmission block 4 and the second part of the linkage assembly. The lower mold 2 has corresponding fixed sides. The pressing part 6; both the pressing surface of the side pressing plate 5 and the supporting surface of the pressing part 6 are provided with an integrally formed fiber-reinforced composite layer; the fiber-reinforced composite layer uses metal or ceramic as the matrix 1-3, wherein reinforcing fibers are dispersedly distributed; the reinforcing fibers are selected from a combination of carbon fiber 1-1 and glass fiber 1-2, and their type is consistent with the type of reinforcing fibers in the product to be molded; when the upper mold 1 closes the lower mold 2, the first part of the linkage component moves along the first direction under the action of mold closing, and drives the second part to move along the second direction, thereby driving the side pressing plate 5 to move toward the side of the mold cavity 3 through the inclined surface transmission structure, so as to cooperate with the pressing part 6 to press the product in the mold cavity 3 from both sides.

[0034] Furthermore, the first direction is a vertical direction, the second direction is a horizontal direction, and the second direction is perpendicular to the mold closing direction.

[0035] Furthermore, the linkage component includes a first wedge block 71 that can slide in the vertical direction and a second wedge block 72 that can slide in the horizontal direction, and the first wedge block 71 and the second wedge block 72 are engaged by a mutually cooperating inclined surface transmission.

[0036] Furthermore, the inclined plane transmission structure includes a first inclined plane 721 disposed on the second wedge block 72 and a second inclined plane 41 disposed on the transmission block 4. The first inclined plane 721 and the second inclined plane 41 cooperate with each other, so that the horizontal movement of the second wedge block 72 can be converted into the lateral movement of the side pressure plate 5.

[0037] Furthermore, the upper mold 1 is provided with a travel channel 10 for the first wedge block 71 to move up and down.

[0038] Furthermore, the first wedge block 71 is provided with an anti-detachment part, which cooperates with the upper mold 1 to limit the movement stroke of the first wedge block 71.

[0039] Furthermore, a reset elastic element 720 is provided between the second wedge block 72 and the upper mold 1, and the reset elastic element 720 is used to drive the second wedge block 72 to reset.

[0040] Furthermore, an elastic buffer 80 is installed on the lower mold 2. The elastic buffer 80 has a retractable push rod 81. When the upper mold 1 and the lower mold 2 are closed, the push rod 81 contacts the upper mold 1 and provides a buffering effect through the elastic buffer 80.

[0041] Furthermore, a second spring 50 is provided between the side pressure plate 5 and the upper mold 1.

[0042] The working principle of this invention is:

[0043] This embodiment provides a build-up mold, including an upper mold 1 and a lower mold 2. The lower mold 2 has a cavity 3 machined at its center to match the product's shape. Side pressing mechanisms are installed on the left and right sides of the upper mold 1. The structural principle of the side pressing mechanisms is as follows:

[0044] The linkage assembly includes a first wedge block 71 (i.e., the first part) and a second wedge block 72 (i.e., the second part). The first wedge block 71 is installed through a vertical travel channel 10 opened on the upper mold 1 and can slide in the vertical direction. Its bottom is provided with a limiting boss as an anti-detachment part to prevent it from falling out of the channel. The second wedge block 72 is installed on the upper mold 1 and can slide in the horizontal direction. The upper inclined surface of the first wedge block 71 and the left inclined surface of the second wedge block 72 are closely fitted to form a transmission engagement.

[0045] The transmission block 4 is mounted on the upper mold 1. The side pressure plate 5 is connected to the upper mold 1 via a second spring 50. A second spring 50 connects the side pressure plate 5 and the body of the upper mold 1. This second spring 50 is normally in a compressed or stretched state, providing the side pressure plate 5 with an elastic preload towards the outside of the mold cavity 3 or assisting in its outward reset. A first inclined surface 721 is machined on the second wedge block 72, and a matching second inclined surface 41 is machined on the inner side of the transmission block 4, together forming the inclined surface transmission structure. The sliding direction of the transmission block 4 is horizontal and perpendicular to the mold closing direction.

[0046] A compression spring is installed between the second wedge block 72 and the side wall of the upper mold 1 as a reset elastic element 720, which always applies a reset force to the second wedge block 72.

[0047] On the left and right sides of the lower mold 2, a pressing block is provided as a clamping part 6, directly opposite the side pressure plate 5. A nitrogen spring is installed on the lower mold 2 as an elastic buffer 80, and each nitrogen spring has a telescopic push rod 81 at its top.

[0048] Work process

[0049] The preformed blank is placed into the cavity 3 of the lower mold 2.

[0050] The drive device drives the upper mold 1 to close downwards. In the initial stage of mold closing, the upper end face of the lower mold 2 contacts and continuously pushes the first wedge block 71 upwards, forcing it to slide upwards along the stroke channel 10.

[0051] The first wedge block 71 pushes the second wedge block 72 through its upper inclined surface, overcoming the elastic force of the return spring and moving towards the transmission block 4. When the second wedge block 72 moves, its first inclined surface 721 slides along the second inclined surface 41 of the transmission block 4, converting the horizontal thrust into a horizontal driving force on the side pressure plates 5 toward the center of the mold cavity 3, pushing the side pressure plates 5 on both sides to move synchronously toward the center.

[0052] The side pressure plates 5 on both sides and the pressing blocks on the lower mold 2 simultaneously press the blank in the mold cavity 3 from both sides, applying huge lateral pressure. Under this lateral pressure, the blank cannot expand laterally during the curing process and is forced to flow in the only free direction—the vertical direction, thereby increasing the product height, i.e., the "thickness" effect.

[0053] After the mold opens, as the upper mold 1 separates from the lower mold 2, the downward pressure on the first wedge block 71 is released. The second wedge block 72, under the action of the reset elastic element 720 (reset spring), slides horizontally away from the mold cavity 3 and resets. The side pressure plate 5 then slides out away from the mold cavity 3 under the elastic restoring force of the second spring 50, releasing its lateral constraint on the molded product. Simultaneously, during the reset process, the second wedge block 72, through the cooperation of its inclined surface with the upper inclined surface of the first wedge block 71, pushes the first wedge block 71 downwards along the stroke channel 10 until it returns to its initial position. At this point, all moving parts have completed their reset, the mold returns to the open state, and the operator can remove the upturned product and insert a new preformed blank to begin the next product molding cycle.

[0054] Based on the above technical solution, to prevent the first wedge block 71 from accidentally dislodging from the stroke channel 10 during movement, this embodiment adopts a dual anti-dislodgement design: the bottom of the first wedge block 71 is provided with a limiting boss as an anti-dislodgement part 7. The size of the boss is larger than the opening at the lower end of the stroke channel 10, thereby forming a mechanical hard limit to prevent the first wedge block from dislodging upwards. The first wedge block 71 always maintains contact with the second wedge block 72 throughout the entire working cycle, forming a kinematic closed-loop constraint, further preventing it from accidentally dislodging upwards or downwards from the stroke channel.

[0055] This application relates to a mold specifically for molding solid / semi-solid fiber-resin mixtures. During mold closing, the mold, through its mechanical structure, applies multi-directional constraints to the solid / semi-solid fiber-resin mixture (hereinafter referred to as the "molding blank") placed within the mold cavity, causing the blank to undergo deformation aimed at compaction and densification. This deformation process is not a simple volumetric compression, but involves complex internal strain, where shear deformation is the key mechanism for achieving material redistribution and axial densification (i.e., upsetting). Specifically, the mechanism of shear deformation is as follows:

[0056] The downward movement of the upper die provides a vertically downward clamping force, constituting the main driving force for axial compression of the blank. Through the linkage component and inclined transmission structure of this invention, the side pressure plate is driven and works in conjunction with the clamping part fixed to the lower die to form rigid, fixed-spaced constraint surfaces on both sides of the blank. Under vertical pressure, the blank naturally tends to flow in all free directions (Poisson expansion). Due to the rigid constraint on both sides, its lateral expansion is completely suppressed. Under this constraint conflict, inside the blank, especially in the region near the constraint interface between the side pressure plate and the clamping part, in order to reconcile the contradiction between axial compression and lateral restriction, uneven interlayer relative slip and dislocations will be forced to occur between fiber bundles, between resin-rich areas, and at the fiber-resin interface; this is shear deformation.

[0057] To address the technical shortcomings of traditional molds, which suffer from increased side pressure clearance and decreased side pressure due to thermal expansion at high temperatures, leading to high porosity and uneven thickness in the product, this application incorporates an integrally formed fiber-reinforced composite layer on the pressing surface of the side pressure plate and the supporting surface of the pressing part. This composite layer uses metal or ceramic as the matrix, with dispersed reinforcing fibers selected from a combination of carbon fiber and glass fiber, and the type of reinforcing fibers is consistent with that in the product to be molded. By introducing carbon fiber and glass fiber, the overall coefficient of thermal expansion of the composite layer can be significantly reduced, ensuring a high degree of matching between its thermal expansion behavior and that of the molded product throughout the entire process from room temperature to curing temperature. This guarantees stable pressing clearance and continuously controllable side pressure transmission, providing a crucial guarantee for achieving high-precision upsetting.

[0058] In addition, the outermost surface of the composite layer is mainly composed of carbon fiber, which has a stable molecular structure and does not absorb moisture. After being combined with the resin matrix, it has excellent interfacial performance, outstanding resistance to damp heat aging and long-term stability, which further ensures the reliability of the molding interface and the long-term consistency of product quality under high temperature and high pressure environment.

[0059] This invention utilizes a purely mechanical "wedge block linkage-inclined surface transmission" mechanism to directly convert the vertical clamping force of the upper mold into the lateral movement of the side pressure plate. This transmission process features a defined stroke and rigid transmission, ensuring a definite proportional relationship between the lateral clamping force and the clamping force. This maintains basic stability throughout the molding process, avoiding the nonlinear increase in lateral pressure caused by compression variations in traditional nitrogen springs. This provides primary mechanical protection for protecting fiber integrity and achieving uniform compaction. By setting fiber-reinforced composite layers on the clamping surfaces of the side pressure plate and the support surfaces of the extrusion blocks, and ensuring that the type of reinforcing fiber matches the product, this solution creatively achieves active matching of the thermal expansion behavior between the key working surfaces of the mold and the product. From room temperature to the high-temperature curing stage, the coefficient of thermal expansion of the mold's working surfaces is significantly reduced, with minimal difference from the product's thermal expansion. This ensures that the clamping gap remains essentially unchanged at high temperatures, completely eliminating the lateral pressure attenuation caused by mold thermal expansion, allowing the material to continue to be compacted stably during the crucial curing stage.

[0060] Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that various changes or modifications can be made to the invention without departing from the principles and spirit of the invention as defined by the claims. Therefore, the detailed description of the embodiments in this disclosure is for illustrative purposes only and is not intended to limit the invention; rather, the scope of protection is defined by the content of the claims.

Claims

1. A wedge-shaped linkage side-pressure mold for molding composite materials, comprising an upper mold (1) and a lower mold (2), wherein the lower mold (2) is provided with a mold cavity (3) for molding products, characterized in that: The upper mold (1) is provided with side pressing mechanisms on both sides. The side pressing mechanism includes a linkage component. The linkage component is movably installed on the upper mold (1) and has a first part that moves along a first direction when the mold is closed and a second part that can move along a second direction different from the first direction. The first part and the second part are connected by transmission. The side pressing mechanism also includes a transmission block (4) provided on the upper mold (1) and a side pressing plate (5) slidably installed on the transmission block (4). An inclined transmission structure is provided between the transmission block (4) and the second part of the linkage component. The lower mold (2) is fixed with pressing parts (6) on both sides. The pressing surface of the side pressing plate (5) and the pressing part (6) The support surface of each mold is provided with an integrally formed fiber-reinforced composite layer; the fiber-reinforced composite layer is based on metal (1-3), in which reinforcing fibers are dispersed; the reinforcing fibers are selected from a combination of carbon fiber (1-1) and glass fiber (1-2), and their types are consistent with the reinforcing fiber types in the product to be molded; when the upper mold (1) closes the lower mold (2), the first part of the linkage component moves along the first direction under the action of mold closing, and drives the second part to move along the second direction, and then drives the side pressure plate (5) to move toward the side of the mold cavity (3) through the inclined surface transmission structure, so as to work with the pressing part (6) to press the product in the mold cavity (3) from both sides.

2. The wedge-shaped linkage side-pressure die for composite material molding according to claim 1, characterized in that, The first direction is a vertical direction, the second direction is a horizontal direction, and the second direction is perpendicular to the mold closing direction.

3. A wedge-shaped linkage side-pressure die for composite material molding according to claim 1, characterized in that, The linkage component includes a first wedge block (71) that can slide in the vertical direction and a second wedge block (72) that can slide in the horizontal direction. The first wedge block (71) and the second wedge block (72) are connected by a mutually cooperating inclined plane transmission.

4. A wedge-shaped linkage side-pressure die for composite material molding according to claim 3, characterized in that, The inclined plane transmission structure includes a first inclined plane (721) disposed on the second wedge block (72) and a second inclined plane (41) disposed on the transmission block (4). The first inclined plane (721) and the second inclined plane (41) cooperate with each other so that the horizontal movement of the second wedge block (72) can be converted into the lateral movement of the side pressure plate (5).

5. A wedge-shaped linkage side-pressure die for composite material molding according to claim 3, characterized in that, The upper mold (1) is provided with a travel channel (10) for the first wedge block (71) to move up and down.

6. A wedge-shaped linkage side-pressure die for composite material molding according to claim 3, characterized in that, The first wedge block (71) is provided with an anti-detachment part, which cooperates with the upper mold (1) to limit the movement stroke of the first wedge block (71).

7. A wedge-shaped linkage side-pressure die for composite material molding according to claim 3, characterized in that, A reset elastic element (720) is provided between the second wedge block (72) and the upper mold (1), and the reset elastic element (720) is used to drive the second wedge block (72) to reset.

8. A wedge-shaped linkage side-pressure die for composite material molding according to claim 1, characterized in that, An elastic buffer (80) is installed on the lower mold (2). The elastic buffer (80) has a retractable push rod (81). When the upper mold (1) and the lower mold (2) are closed, the push rod (81) contacts the upper mold (1) and provides a buffering effect through the elastic buffer (80).

9. A wedge-shaped linkage side-pressure die for composite material molding according to claim 1, characterized in that, A second spring (50) is provided between the side pressure plate (5) and the upper mold (1).

10. A wedge-shaped linkage side-pressure die for composite material molding according to claim 1, characterized in that, The thickness of the fiber-reinforced composite layer is 0.1 mm to 2.0 mm, and the volume percentage of the reinforcing fiber in the composite layer is 5% to 40%.

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