Research On Blank Design For Sheet Metal Forming Based On Physycial Inverse Method

As for sheet metal forming, determining blank shape and dimension is the precondition to analyse deformation and manufacturability of sheet metal parts and to draw up process specification. It can ameliorate unevenness of blank deformation, improve forming limit and reduce height of earing, shaving allowance as well as the number of stamping try-and-debugging to precisely determine the blank shape for sheet metal forming. Accordingly, production cycle will be shortened and productivity will be improved.This thesis summarized various approaches to determine the blank for sheet metal forming and researched on optimum blank shape for sheet metal forming based on physical inverse method that presented by Professor Han Zhiren.Firstly, it introduced the theoretic basis of the physical inverse method including the principle of similarity, the selection of simulative materials and the principium of physical inverse method.Secondly, it studied the selection process and principle of physical inverse method's simulative materials, analysed influencing factors in determining the precise blank shape and dimention, explicated process flows of physical inverse method and researched on how to make the physical inverse method's equipments simplified and practical.Finally, took the flangeless rectangular case for example to test the physical inverse method and compared with experiential method and inverse finite element approach.It proved that the physical inverse method was much superior of experiential method and was more accurate than the inverse finite element approach as well. It truly is an up-to-date, effective and prompt method to obtain optimum blank shape and dimension for sheet metal forming.