铝制件成形过程中存在的问题之一是当采用适于钢件加工的拉延模时会使压边圈对毛坯施压过甚,以致毛坯损坏和产生故障。图示的拉延模就是限制这种压力的一种方法,而且还可以给毛坯提供一个拉延的空间。首先,在压边圈上加工出一个台肩,同时制备若干个厚度不同的用淬硬工具钢制成的套环。可把这些套环 One of the problems in the forming of aluminum parts is that the use of a drawing die suitable for the machining of steel parts causes the blank holder to press the blank excessively so that the blank is damaged and malfunctions. The drawing dies are one way to limit this pressure and also provide a space for drawing the blank. First, a shoulder is machined on the blank holder and several rings made of hardened tool steel are prepared at the same time. You can put these loops