磷青铜薄板高速冲裁件冲裁断面质量分析与控制
[Abstract]:High-speed precision stamping technology is an advanced manufacturing technology in modern stamping production. It has the characteristics of high production efficiency, high quality, high consistency and energy saving, saving manpower, reducing cost and ensuring safe production, etc. Widely used in electronic communications, electrical machinery, automotive and household appliances and other products in the production of technology. High speed blanking of sheet metal is an important process of high speed precision stamping technology, and the section quality of blanking part is the key index to measure the quality of blanking parts. In view of the lack of research on the cause of section quality and quality control technology of high-speed and precision blanking parts at present, it is of great practical application value to carry out the corresponding research on the section quality and quality control technology of high speed precision blanking parts, which affects the actual production. In this paper, the high speed blanking parts of phosphor bronze sheet, which are commonly used in industry, are studied. Based on the deformation mechanism of sheet metal blanking, the characteristics of high speed precision blanking process are analyzed. The paper summarizes the application of high speed blanking of thin plate and the technological problems existing in practical application, and puts forward the research contents and methods of this paper. The dynamic mechanical properties of phosphor bronze sheet were studied by Hopkinson test, and the dynamic constitutive model under the similar condition of high speed blanking was obtained. By comparing and studying the traditional fracture criterion of materials, the fracture criterion of high speed blanking material was given. It provides the necessary condition for the finite element simulation analysis. In addition, the finite element analysis software Deform is used to simulate the section formation during high-speed blanking. The stress and strain distribution, crack initiation, propagation and fracture process during deformation in the characteristic region are studied. The effects of blanking speed, die geometric parameters and blanking clearance on the cross-section quality of blanking parts are studied. The differences and similarities between high-speed blanking and traditional blanking fractography are obtained. The quality control method of high-speed blanking section of thin plate is put forward. Based on the dynamic mechanical properties of high speed blanking of C5210 phosphor bronze sheet and the results of finite element simulation analysis of blanking process, the high speed blanking test of C5210 phosphorus bronze sheet was carried out. The experimental results are in good agreement with the simulation results. The key points of quality control for high-speed blanking section of thin plate are put forward, that is, the speed is above 1000spm, the ratio of blanking clearance to material thickness is 0.02, the radius of cutting edge is 0.2, and the ratio of cutting edge radius to material thickness is 0.2. Can obtain the ideal blanking section quality. In this paper, the research of sheet metal blanking technology and the relevant conclusions can provide a reference for the actual sheet metal high-speed blanking production. At the same time, it also lays a foundation for further research on the mechanism of high speed blanking and the quality control of blanking parts.
【学位授予单位】:南京航空航天大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TG389
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