对类似如图1或图2的圆筒形制件的制造,由于冲压生产的明显优点,日益广泛地被有关工厂采用落料、拉延、冲孔或复合的工艺——落料拉延(或落料拉延冲孔)进行。这种用拉延法获得的圆筒形制件称圆筒形拉延件。通过计算或其它方法获得这种制件拉延之前毛坯尺寸的过程简称毛坯尺寸的展开。这种展开出来的毛坯尺寸一般也是用冲压方法落料获得的,称毛坯尺寸为落料尺寸。 For the manufacture of cylindrical parts like the one shown in Figure 1 or Figure 2, due to the obvious advantages of stamping production, it has been increasingly widely adopted by the factory concerned for blanking, drawing, punching or compounding - blanking (or Blanking drawing punching). The cylindrical part obtained by the drawing method is called a cylindrical pull part. The process of obtaining the size of the blank before such drawing is calculated or otherwise obtained is referred to as the unwinding of the size of the blank. This unfolded blank size is generally blanked by blanking obtained, said the blank size blanking size.