CN-117325479-B - In-situ conformal heating homogenizing forming method for cylindrical part made of special-shaped inner cavity composite material

CN117325479BCN 117325479 BCN117325479 BCN 117325479BCN-117325479-B

Abstract

The invention provides an in-situ conformal heating homogenizing forming method for a cylindrical part of a special-shaped inner cavity composite material, and a carbon fiber prepreg and heat supplementing adhesive film composite layering design; heating and preparing a thermal compensation adhesive film, compounding and laying carbon fiber prepreg and the thermal compensation adhesive film, compounding the heating film and a metal outer die, curing, demolding and machining. The in-situ conformal heating homogenizing forming method for the special-shaped inner cavity composite cylindrical part provided by the invention adopts the in-situ conformal heating homogenizing forming technology for the composite cylindrical part, explores a forming mechanism under the coupling action of a soaking temperature field and a pressure field which are cooperatively controlled by a heating film and a complementary heating adhesive film under variable thickness, forms a macroscopic multiscale temperature gradient integrated forming technology, realizes homogenization, low cost, high efficiency and low energy consumption manufacture of large-size complex cylindrical part products, meets various mechanical property indexes of the products, achieves application, and improves the competitiveness of composite high-end products in the national defense field.

Inventors

ZHANG WENCONG
CUI CHAO
CUI GUORONG
HOU JIABIN
GUO JINYU

Assignees

哈尔滨工业大学（威海）

Dates

Publication Date: 20260505
Application Date: 20231007

Claims (5)

1. The in-situ conformal heating homogenizing forming method for the special-shaped inner cavity composite cylindrical part is characterized by comprising the following steps of: step S1, designing and analyzing a composite cylindrical part; s2, performing composite layering simulation design on the carbon fiber prepreg and the thermal compensation adhesive film; in the step S2, an Abaqus software and a heating film embedding operation mode are adopted to simulate and separate a temperature field with a variable thickness of a material; embedding the thermal compensation adhesive film into the carbon fiber prepreg according to the variable thickness structure, simulating a temperature field, a mode, static rigidity and stability, determining and optimizing the position of the thermal compensation adhesive film, and realizing uniform variable thickness temperature distribution; s3, preparing a heating film and a heat-supplementing adhesive film of the homogeneous resin; s4, compounding and laying a carbon fiber prepreg and a thermal compensation adhesive film; S5, compounding the heating film with the metal outer mold; s6, curing reaction; and S7, demolding and machining.
2. The method for in-situ conformal heating and homogenizing forming of a composite cylindrical part with a special-shaped inner cavity according to claim 1, wherein in the step S4, according to the simulation design result, the carbon fiber prepreg is paved according to the angle and the number of layers, a heat-supplementing adhesive film is applied on the surface of the carbon fiber prepreg, the axial dimension of the heat-supplementing adhesive film is larger than that of the carbon fiber prepreg, and then the carbon fiber prepreg is paved continuously; After the composite layering is completed, the heat-supplementing adhesive films at the front end and the rear end are connected with electrodes and circuits.
3. The method for in-situ conformal heating and homogenizing forming of a cylindrical part of a composite material with a special-shaped inner cavity according to claim 1, wherein in the step S5, a prefabricated uniform conformal heating film is adhered to the surface of a metal outer mold by using an adhesive, the temperature uniformity inside the metal outer mold is tested by electrifying, and then the composite material after composite layering is clamped.
4. The method for in-situ conformal heating and homogenizing forming of the special-shaped inner cavity composite material cylindrical part according to claim 3, wherein the wire and the temperature thermocouple are airtight through a vacuum bag adhesive tape when the vacuum bag is vacuumized.
5. The method for in-situ conformal heating and homogenizing forming of a composite tubular member with a special-shaped inner cavity according to claim 1, wherein in the step S6, curing and crosslinking reactions are performed among the components of the thermosetting resin.

Description

In-situ conformal heating homogenizing forming method for cylindrical part made of special-shaped inner cavity composite material Technical Field The invention belongs to the technical field of composite material forming, and particularly relates to an in-situ conformal heating homogenizing forming method for a cylindrical part of a composite material with a special-shaped inner cavity. Background The carbon fiber composite material has the outstanding advantages of lowest density, high specific strength, high specific stiffness, corrosion resistance, high temperature resistance, fatigue resistance and the like. However, the inside of the cylindrical part made of the composite material is of a special-shaped structure with different sizes of multiple ribs, multiple windows and multiple flanges, and the temperature field formed by the traditional autoclave is uneven, so that the uniformity, the temperature resistance, the mechanical property and the stability deviation of the shell are large, and the reliability and the large-scale application of the composite shell are seriously affected. Specifically, the reason why the product cannot be formed in a homogeneous way at the present stage is that (1) the circumferential temperature difference of the product is large (the temperature difference is more than or equal to 30 ℃) due to the heating mode and the air duct in the autoclave forming process, and (2) the thickness of the product is large, the structure is complex, and the temperature difference of the inner layer and the outer layer is large due to the anisotropy of fibers, especially the abnormal structure with variable thickness. Meanwhile, the traditional autoclave molding has the defects of high production and manufacturing cost and overlong production period of composite cylindrical parts due to low efficiency and large energy consumption, and is difficult to meet the important requirements of low-cost large-scale batch production, quick response production and the like in the current national defense industry. Therefore, development of low-cost and efficient homogeneous forming key technology is a necessary approach to solve the bottleneck problem. Disclosure of Invention The invention aims to provide an in-situ conformal heating and homogenizing forming method for a composite cylindrical part with a special-shaped inner cavity, which solves the technical problems of complex forming structure and uneven internal temperature of the composite cylindrical part, adopts the in-situ conformal heating and homogenizing forming technology for the composite cylindrical part, explores a forming mechanism under the coupling action of a soaking temperature field and a pressure field which are cooperatively controlled by a heating film and a heat supplementing adhesive film under variable thickness, combines resin gradient distribution controlled by non-pot adhesive suction to form a macroscopic multiscale temperature gradient integrated forming technology, realizes homogenization, low-cost, high-efficiency and low-energy consumption manufacture of large-size complex cylindrical part products on the basis of conventional pressurizing equipment such as an autoclave or a compression molding device, meets various mechanical property indexes of the products, achieves application, and improves the competitiveness of composite high-end products in the national defense field. The in-situ conformal heating homogeneous forming method for the special-shaped inner cavity composite cylindrical part specifically comprises the following steps: step S1, designing and analyzing a composite cylindrical part; S2, designing a composite layer of the carbon fiber prepreg and the thermal compensation adhesive film; S3, preparing a heating film and a heat-supplementing adhesive film of the homogeneous resin; s4, composite laying of carbon fiber prepreg and a thermal compensation adhesive film; S5, compounding the heating film with the metal outer mold; s6, curing reaction; and S7, demolding and machining. In the step S2, an operation mode of embedding a complementary hot film is adopted by Abaqus software, so that simulation and separation of a temperature field with a variable thickness of a material are realized; And embedding the heat-supplementing adhesive film into the carbon fiber prepreg according to the variable thickness structure, simulating a temperature field, a mode, static rigidity and stability, determining and optimizing the position of the heat-supplementing adhesive film, and realizing uniform distribution of variable thickness temperature. In the step S4, according to the simulation design result, the carbon fiber prepreg is layered according to the angle and the number of layers, for example, the thermal-pressure coupling of the hand and the electric iron is performed, and the thermal compensation adhesive film is applied on the surface of the carbon fiber prepreg, similar to the thermal-pressure coupling of the el