薄板毛坯经多次拉伸制造深锥形零件很困难,不仅使用的工装很多,而且制成品的质量也相当差(变薄15～20％,由于不能消除工装工作部分的印痕,表面不平,尺寸和形状不稳定等)。此外,制造薄壁锥形零件S。/D≥4％时,一般不能采用通常的深拉伸。因为冲头与毛坯的接触区产生很大的冲击载荷,在拉伸工艺开 It is very difficult to manufacture deep conical parts by multiple drawing of sheet blanks. Not only are a lot of tooling used, but also the quality of finished products is quite poor (thinning of 15 to 20%, since the indentations in the working part of the tooling can not be eliminated, Size and shape instability, etc.). In addition, a thin-walled conical part S is manufactured. / D ≥ 4%, generally can not be used to the general deep drawing. Because the punch and the blank contact area have a great impact load, open the drawing process