Method for accurately designing molded surface of autoclave forming fixture for composite products

Abstract

The invention relates to a method for accurately designing the molded surface of an autoclave forming fixture for composite products, belonging to the technical field of autoclave forming fixture design for composite products. The method utilizes a cooling curve of a product curing technology curve, disperses a product molded surface S into a plurality of points at room temperature and calculates a product molded surface S' at the stress critical temperature by the displacement formula of the points according to the thermal expansion coefficient of the products. When a fixture molded surface G' is the same with the product molded surface at the stress critical temperature, S' is equal to G'. And a fixture molded surface G at room temperature is calculated according to the fixture molded surface G' and the thermal expansion coefficient of a fixture material. The method solves the problem that the traditional design method generates the fixture molded surface by directly copying the product room temperature molded surface and repairs dies repeatedly according to the rebound, reduces the development and production costs and improves the design efficiency and quality.

Description

technical field [0001] The invention relates to a method for accurately designing the surface of a composite material part autoclave forming tooling, and belongs to the technical field of composite material part autoclave forming tooling design. Background technique [0002] Autoclave forming tooling is the basis of advanced composite material parts forming, which plays the role of transmitting temperature and pressure, positioning and ensuring the dimensional accuracy of the profile. The most important thing to consider in tooling design is tooling profile design, which plays a non-negligible role in the forming accuracy and quality of composite parts. [0003] After the composite material part undergoes high-temperature solidification and cooling process, due to complex factors such as the thermal expansion and contraction effect of the material and the chemical reaction shrinkage effect of the matrix resin, there will be a certain degree of inconsistency between its profi...

AI Technical Summary

Problems solved by technology

This method solves the problem of the traditional design by directly copying the room temperature profile of the workpiece to generate the tooling formwork profile, and then repeatedly repairs the mold according to the springback, reduces the development cost, and improves the design efficiency and quality

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