A blank preparation method for rubber bag forming thin-walled parts

Abstract

The invention relates to a method for preparing blanks of thin-walled parts formed by rubber bags, which comprises the following steps: 1) designing a piece of wool in CAD software CATIA V5 according to the digital model of parts and molds; 2) in CAE software PAMSTAMP2G, carrying out Precise forming simulation analysis of rubber bag process; 3) After the calculation, activate the simulation result of the last step of the forming stage in the post-processing module, import the edge line of the part, and compare the two; 4) Activate the first step of the forming stage in the simulation result , the edge line of the initially accurate blank required for actual forming; 5) Output the edge line of the blank as an IGS file. This method is based on the real properties of the material, and has experienced the actual rubber bag forming process under optimized process parameters and boundary conditions. Therefore, the shape of the blank prepared by this method is accurate and reasonable, and there is no trimming allowance, which is convenient for precise forming. Due to improved productivity and part quality.

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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