Complex-curved-surface component hot-forming die design method considering nonuniform temperature field

Abstract

The invention discloses a complex-curved-surface component hot-forming die design method considering a nonuniform temperature field, and belongs to the field of non-cutting or processing of metal plates or pipes and rods or profiles. The method provided by the invention comprises the steps of through building a heat conduction model between a plate and a die, acquiring nonuniform temperature fielddistribution on the surfaces of the plate and the die at the forming finishing moment; then at the nonuniform temperature, calculating a contraction scale coefficient of the die size, and designing an initial structure; and importing a workblank material and a die mathematical model into simulation software, simulating a hot-forming process, acquiring temperature field and stress distribution ofa large-scale die through heat conduction, combining a theoretical calculation result for reversely correcting the die structure design, and producing after structure refining. According to the methodprovided by the invention, the error of the component dimension caused by the nonuniform temperature field and a thermal expansion coefficient can be reduced, the dimension precision of a complex-curved-surface thin-wall component is improved, and the qualification rate of the complex-curved-surface thin-wall component is improved.

Description

technical field [0001] The invention belongs to the field of basically non-cutting processing or processing of metal plates or pipes, rods or profiles, and relates to a metal plate thermal shaping process, in particular to a complex curved surface part thermoforming mold design method considering non-uniform temperature field. Background technique [0002] In the field of aerospace, product components are developing in the direction of lightweight, complex and integrated, especially complex curved thin-walled components. Titanium alloys are widely used in the aerospace field due to their high specific strength, high temperature resistance, corrosion resistance and other excellent properties. However, due to poor plasticity and high deformation resistance of titanium alloys at room temperature, cold forming of sheets is difficult, so hot forming is the main process for forming titanium alloy sheet metal. The hot forming of titanium alloy mainly adopts the heating method of t...

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Problems solved by technology

[0005] Aiming at the problem that the nonlinear expansion of the mold caused by the non-uniform temperature field has a low precision of the titanium alloy complex curved surface thin-walled components and the surface size, the present invention proposes a design method for the thermoforming mold of the complex curved surface that considers the non-uniform temperature field. Reduce the error caused by non-uniform temperature field and thermal expansion coefficient on the size of parts, improve the dimensional accuracy of thin-walled components with complex curved surfaces of titanium alloys, and increase the pass rate of thin-walled components with complex curved surfaces of titanium alloys

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