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拉延加工的拉延力有两个部分:凸模作用的拉延力Pd和压料板作用的压料力Pb。双动压床这两个力分别作用,而靠气垫和弹簧的力作用于压料板的单动压床,滑块必须承受此二力的合力。由于拉延加工不象冲裁加工那样在下死点附近进行,而是在滑块行程的中部以下,高于下死点的位置开始的,使用机械压力机时对其压力能力的变化(压力一行程曲线)需要很好地注意。在开始拉
The drawing process has two parts: the drawing force Pd and the pressing force Pb acting on the blank. Double-acting pressure bed these two forces respectively, and by the air cushion and spring force acting on the pressure plate of the single-action press, the slider must withstand the force of these two forces. Since the drawing is not performed in the vicinity of the bottom dead center as in the blanking, but the change in the pressure capacity (pressure at the time of using the mechanical press starting from the position below the middle of the slider stroke and above the bottom dead center Stroke curve) requires good attention. At the beginning of pull