CN-122008454-A - Composite material forming die with embedded part and manufacturing method thereof

CN122008454ACN 122008454 ACN122008454 ACN 122008454ACN-122008454-A

Abstract

The invention discloses a composite material forming die with an embedded part and a manufacturing method thereof, and relates to the technical field of composite material forming, wherein the composite material forming die of the embedded part comprises a first embedded part area provided with a first embedded part and a non-embedded part area not provided with the first embedded part; the first embedded part area sequentially comprises a gel coating layer, a first structural layer, a heat conduction diffusion layer, a second structural layer and a heat buffer layer along the thickness direction of the die from being close to the molding surface to being far away from the molding surface, wherein the heat buffer layer is arranged on the outer surface of the second structural layer in a compounding manner and covers one end of the first embedded part, which is far away from the molding surface. The invention provides a composite material forming die with an embedded part, wherein a heat conduction diffusion layer and a heat buffer layer are arranged in a first embedded part area, local heat flux density and gentle temperature gradient are reduced through the synergistic effect of transverse diffusion and heat insulation in the thickness direction, overheating and heat stress concentration in the embedded part area are avoided, and the thermal stability of the die and the precision consistency of a formed part are improved.

Inventors

CHEN JIKE
Chen Nengpei
LI QI

Assignees

宁波碳谷科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. A composite material forming die with embedded parts is characterized in that one or more first embedded parts are arranged on the die, the die comprises a first embedded part area provided with the first embedded parts and a non-embedded part area not provided with the first embedded parts, and the first embedded part area sequentially comprises a gel coat layer, a first structural layer, a heat conduction diffusion layer, a second structural layer and a heat buffer layer from close to a forming surface to far away from the forming surface along the thickness direction of the die; the non-embedded part area sequentially comprises a gel coat layer, a first structural layer and a second structural layer from the part close to the molding surface to the part far away from the molding surface along the thickness direction of the mold.
2. The composite molding die with the embedded part of claim 1, wherein the heat-conducting diffusion layer is arranged between the first structural layer and the second structural layer and is arranged along the circumferential direction of the first embedded part so as to diffuse heat generated by the first embedded part to surrounding areas.
3. The composite material molding die with embedded parts according to claim 2, wherein the equivalent radius R1 of the heat conduction and diffusion layer and the equivalent radius R2 of the first embedded part meet R1 is more than or equal to 1.5R2, and/or The thickness of the heat conduction diffusion layer is 0.5-2.5 mm.
4. The composite molding die with the embedded part of claim 2, wherein the heat-conducting diffusion layer is one of aluminum, copper, aluminum alloy or copper alloy.
5. The composite material forming die with the embedded part of claim 1, wherein the thickness of the thermal buffer layer is 0.2-1.5 mm.
6. The composite molding die with embedded parts of claim 5, wherein the thermal buffer layer is made of silica gel-based heat insulation material or ceramic fiber material.
7. The composite forming die with embedded parts of claim 1, wherein the first structural layer comprises a first carbon fiber layer and a first glass fiber layer, the second structural layer comprises a second carbon fiber layer and a second glass fiber layer, and the heat conduction diffusion layer is located between the first glass fiber layer and the second carbon fiber layer.
8. A method of manufacturing a composite forming die with embedded parts as claimed in any one of claims 1 to 7, comprising the steps of: S1, preparing a male die, and coating a release agent on the surface of a die of the male die; s2, placing a first embedded part according to the position of the design drawing, and adhering the first embedded part to the surface of a die of the male die; S3, spraying a gel coat layer on the surface of the male die; s4, preparing a first structural layer, and paving a heat conduction diffusion layer in a first embedded part area; s5, preparing a second structural layer, and paving a thermal buffer layer in the first embedded part area.
9. The method for manufacturing a composite molding die with embedded parts according to claim 8, wherein the step S4 specifically comprises: s41, sequentially paving a first carbon fiber layer and a first glass fiber layer, and paving a heat conduction diffusion layer in a first embedded part area; S42, setting a vacuum system and detecting the vacuum degree; S43, introducing resin and performing primary curing, and then removing the vacuum system and polishing the outline of the mold.
10. The method for manufacturing a composite molding die with embedded parts according to claim 8, wherein the step S5 specifically comprises: s51, sequentially paving a second carbon fiber layer and a second glass fiber layer, and paving a thermal buffer layer in the first embedded part area, wherein the thermal buffer layer covers one end of the first embedded part far away from the molding surface; S52, setting a vacuum system and detecting the vacuum degree; s53, introducing resin and performing secondary curing.

Description

Composite material forming die with embedded part and manufacturing method thereof Technical Field The invention relates to the technical field of composite material forming, in particular to a composite material forming die with an embedded part and a manufacturing method thereof. Background The composite material forming die is widely applied to the forming and manufacturing process of carbon fiber composite material products. In order to meet the installation, positioning or subsequent assembly requirements of the molded part, the existing composite molding die is generally provided with a first embedded part on the die body, and the first embedded part is used for positioning a second embedded part on the molded part in the molding process. In the prior art, the first embedded part is usually made of metal, one end of the first embedded part is flush with the molding surface of the mold, and the other end of the first embedded part is exposed on the back surface or the non-molding side of the mold, so that the first embedded part can be assembled or positioned in the molding process. In the process of forming carbon fiber composite materials, it is generally necessary to heat and cure the composite material raw material laid on a mold in a vacuum environment. The existing composite material forming die mostly adopts a carbon fiber and glass fiber composite laminated structure so as to give consideration to strength and cost. However, the carbon fiber composite material has obvious anisotropy, the heat conductivity coefficient of the carbon fiber composite material in the vertical fiber direction is usually only 0.3-1.0W/(m.K), and the heat conductivity coefficient of the titanium alloy material commonly used for the first embedded part can reach 6-8W/(m.K), and the heat conductivity of the carbon fiber composite material and the titanium alloy material have obvious difference. In the actual molding process, the mold is heated together with the ambient temperature, the mold coated by the composite material raw material is locally positioned at the inner side of the whole vacuum system, and external heat needs to be conducted to the mold body through the vacuum bag and the composite material raw material layer in sequence. Because the first embedded part on the mould is covered by the composite material raw material, the other end is exposed on the non-molding side of the mould, and meanwhile, the second embedded part on the molding part is also made of metal, heat can be conducted preferentially along the metal embedded part in the heating and curing process, and a local high heat conduction channel is formed, so that the heating rate of the surrounding area of the first embedded part is obviously higher than that of the area in the mould, where the first embedded part is not arranged. The heat conduction difference causes obvious temperature gradient in the local areas of the mold and the molded part in the heating and curing processes, so that the problems of inconsistent resin reaction rate, uneven stress release and the like of the composite material occur in the curing stage, and the defects of local buckling, deformation and the like of the molded part are further caused. Especially in the mould that the structure shape is complicated, the curved surface change is great, this problem is more outstanding, seriously influences the dimensional accuracy and the overall quality of shaping spare, has restricted combined material forming die's stability and application scope. Disclosure of Invention The problems that the existing composite material forming die is concentrated in local heat and overlarge in temperature gradient in the thickness direction of the die when the metal embedded part is arranged are solved, and particularly, in the heating curing or recycling process, the embedded part and surrounding composite materials are obvious in heat conduction property difference, and local overheating, heat stress concentration, deformation and even cracking of the die are easily caused, so that the forming precision, the service life and the product quality of the die are affected. The invention aims to provide a composite material forming die with an embedded part, wherein a heat conduction diffusion layer and a heat buffer layer are arranged in a first embedded part area, local heat flux density and gentle temperature gradient are reduced through the synergistic effect of transverse diffusion and heat insulation in the thickness direction, overheating and heat stress concentration in the embedded part area are avoided, and the thermal stability, structural durability and accuracy consistency of the formed part of the die are improved. The embodiment of the invention also provides a manufacturing method of the composite material forming die with the embedded part. In order to achieve the above purpose, the invention provides a composite material forming die with embedded parts, wherein one or more firs