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1 问题的提出我厂用油压机对汽车薄板零件进行拉伸(或成形)工艺加工的很多。立式油压机的工作顺序是:快速空程下降→慢速工作成形(或拉伸)→保压→卸压→回程。其中,几乎所有的油压机在慢速工作成形阶段,其工作速度都很慢,一般为3～6mm/s,约为快速空程下降速度的1/10。如我厂在拉伸后桥盖时,工作时间(24.4s)是快速空程下降时间(4s)的6倍。可见,合理地提高薄板冲压油压机工作速度,是一个值得探讨的课题。用油压机成形(或拉伸)众多的薄板零件中,我们发现拉伸(或成形)过程和定型加压压力变化的一个规律,即拉伸(或成形)过程压力大约是定型加压压力的1/2.2～1/3,
1 problem put forward I plant hydraulic machine for automotive sheet parts stretching (or forming) a lot of processing technology. The working sequence of vertical hydraulic press is: rapid emptying down → slow working forming (or stretching) → holding pressure → pressure relief → backhaul. Among them, almost all the hydraulic machine in the low-speed forming stage, its working speed is very slow, usually 3 ~ 6mm / s, about the rapid decline of speed 1/10. Such as my plant after stretching the bridge cover, working hours (24.4s) is the rapid transit time (4s) 6 times. Can be seen, a reasonable increase in sheet metal hydraulic press working speed, is a topic worth exploring. In forming (or stretching) a large number of thin-walled parts with a hydraulic press, we find that one of the laws of the stretching (or forming) process and the setting press pressure change is that the drawing (or forming) process pressure is about 1 /2.2~1/3,