一、概述 对凸缘施加周边压力的液压拉延方法是近年来出现的一种深拉延新工艺。与强制润滑式液压拉延相比,这一方法可获得更小的拉延系教。施加周边压力的液压拉延方法的原理见图1,板料置于充满液体的凹模上,加上压迫圈后,凸模下降并压入凹模,此时封闭的凹模腔内产生一定的液体压力。此压力一方面将板料压贴在凸模上,一方面通过四模上的孔道引到板料的四周,对凸缘施加一个径向推力,使凸缘更容易流入凹模。这种拉延方法不仅具有强制润滑液压拉延的特 First, an overview of the application of pressure on the flange around the hydraulic drawing method is a deep drawing in recent years, a new technology. Compared with forced lubrication of hydraulic drawing, this method can be obtained smaller drawing department teach. The principle of the hydraulic drawing method applying peripheral pressure is shown in Fig. 1, the sheet is placed on a die filled with liquid, and after the die is pressed, the punch is lowered and pressed into the die. At this time, a closed cavity Liquid pressure. The pressure on the one hand, the pressure plate attached to the punch, on the one hand, through the four-hole channel leads to the plate around the flange to exert a radial thrust to make the flange more easily flow into the die. This drawing method not only has forced lubrication of hydraulic drawing special