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在汽车厂设计新式样汽车结构并正式投入流水生产以前,广泛采用着一种小批量的试生产,试制样车的车身和驾驶室——获取复杂形大尺寸表面的过程是最困难的,在带金属或塑料工作部分的一般模具内拉深时,准备时间长、劳动消耗大。大型合金铸铁拉深模的制造与调整要耗费2000额定小时以上,塑料模也超过1200额定小时,此外,在这种情况下高效地变换试件的结构是不可能的。因而实际上拖延了汽车的投产时间。许多厂采用按木制或金属胎模手工制作的传统方法加工,但最后校正困难。校正一个大型件需30～40额定小时,而且不能保证
Before the automaker designed a new model car structure and formally put it into production, a small batch of pilot production was widely used to prototype the car’s body and cab - getting the most complex, With metal or plastic work part of the general mold deep drawing, preparation for a long time, labor-intensive. The manufacture and adjustment of a large alloy cast iron drawing die takes more than 2,000 rated hours and the plastic mold also exceeds 1,200 rated hours. In addition, it is not possible to efficiently change the structure of the test piece in this case. Thus actually delaying the start-up time of the car. Many plants use traditional methods of hand-made wood or metal molds, but the final correction is difficult. Calibration of a large part of 30 ~ 40 rated hours, but can not be guaranteed