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The technics of Sheet Metal Forming Processes , which has so many virtues of highly material utilization、productivity effect and dimensional precision and so on. Across this process, we can obtain a highly improving in material structure and function . In addition, it is applied to multitudinous production and has also played a important role in our living life and national defense construction in recent years.The processes of Sheet Metal Drawing forming is a kind of complex mechanics process,Because of the uncoherence of the flow of metals,it will lead to breakyad and flange wrinkling,and following have low effcience and high scrap rate of production . In addition,due to the rectangular case has the typical characteristic that non-solid of revolution symmetrical forming, its stress- strain changes all the time in each place during the process of distortion, compare to the tubular components,the process of rectangular box drawing will have a more complex stress,strain and fraction condition.Besides,the characteristic of drawing forming is also similar to the automobile cover and other complex drawing ones. In this acticle,we have hold a deeply study of the forming mechanism, the formed characteristic,and the drawing flaw of rectangular case draming forming,it will be helpful to us to discusse the complex drawing covers.Lots of craft factors will take a great influence to rectangle box drawing forming,such as the plate blank、mould and so on, they will affect the quality of rectangular box drawing directly. Thus a suit of reasonable craft parameters will enhance the limit of draming forming, void the breakage, folds and other flaws, at last the productivity will increase involuntary.This article utilizes the simulation analysis method—holded a simulation for ramming process by the simulation analysis software-Qform, besides, analysises lots of craft parameters quantificationally ,that is the influence to Sheet forming performance, such as rectangular case geometrical shape effect(rc/B), the blank shape of rectangular case, die edge radius(r_d). at last, summarizes a suit of reasonable technological design parameters,so that prevents drawing flaw to the rectangular case.
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