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本文介绍了一种利用椭圆凹模液压胀形制作成形极限图的方法．与通常采用的半球形凸模和圆柱凸模刚模胀形法相比，该方法更简便易行．
In this paper, a method of forming the limit map by using the elliptical concave die hydraulic bulging is introduced. Compared with the commonly used semi-spherical punch and cylindrical punch rigid mold bulging method, this method is more simple and easy.