Blank preparation method for rubber bladder formed thin-walled part

Abstract

The invention relates to a blank preparation method for a rubber bladder formed thin-walled part. The method comprises the following steps of 1) performing digital-analogue design on a blank in CAD (computer-aided design) software CATIAV5 according to the part and a die; 2) performing rubber bladder process accurate forming simulation analysis on the blank in CAE (computer-aided engineering) software PAMSTAMP2G; 3) after calculation, activating a simulation result of the last step of a forming stage in a post-processing module, importing the edge line of the part, and comparing the simulation result with the edge line; 4) activating the first step of the forming stage in the simulation result, and obtaining the edge line of the initial accurate blank required by actual forming; 5) outputting the edge line of the blank as an IGS file. The method is based on the real property of a material, and an actual rubber bladder forming process is implemented under optimized process parameter and boundary conditions, so that the blank prepared by the method is accurate and reasonable in shape, free of trimming allowance and convenient to accurately form, and the production efficiency and the quality of the part are improved.

Description

technical field [0001] The invention relates to a precise blank preparation method for a thin-walled part formed by a rubber bag based on finite element numerical simulation, and belongs to the technical field of plastic processing. Background technique [0002] When the rubber bag is formed, the rubber bag is used as the elastic die or punch, and the liquid is used as the pressure transmission medium to press the metal sheet according to the rigid punch or die. The main advantages of this process: it can form parts with complex shapes; it can partially replace the rigid mold bending and stretching methods, shortening the production preparation cycle; the mold stress concentration and impact phenomenon are less during the forming process, and the mold material requirements are not high; Under the action of high pressure and friction, the plasticity of the material can be fully utilized. Due to the relatively uniform thickness change, the internal damage of the material is re...

AI Technical Summary

Problems solved by technology

[0007] With the increasingly higher requirements for the aerodynamic shape of modern aircraft, there are more and more parts with complex shapes in actual design and production. Method 1 is based on geometric algorithms and can only solve the problem of blanking parts with simple shapes. Method 2 adds too much Many manual operations, relying more on manual experience, lack of accuracy, affect production efficiency; although the third method includes material properties, the efficiency is high, but because it is not based on the actual forming process, it does not include the tension generated by the material when it is stressed. Complex forms of deformation such as stretching and compression lead to problems such as inaccurate unfolding of complex surfaces and failure to unfold

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