过去我们对制定拉深零件的毛料几何外形考虑不周,大都简单地选择了不开口毛料,按不开口毛料计算和设计模具,因而对成形复杂或较深尺寸的盒形、帽形零件造成模具套数多,需增加中间退火工序,零件表面质量不好,废品率高。后来,我们在合理选用拉深毛料方面作了一些努力,并取得了良好效果。 In the past we have to develop the drawing parts of the wool geometry considerations ill-considered, most simply choose the non-open wool, according to the non-open wool calculation and design molds, forming complex or deeper box-shaped, hat-shaped parts mold More sets of numbers, the need to increase the intermediate annealing process, parts surface quality is not good, high rejection rate. Later, we made some efforts to rationalize the drawing of wool, and achieved good results.