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在设计盒形件拉深模过程中,确定该盒形件能否一次拉深成形及毛坯形状尺寸,是保证模具设计质量,提高经济效益的重要环节。笔者经过多年的实践与理论上的探索,总结如下简明方法。经生产验证,基本上能够达到较为满意的效果。一、盒形件一次拉深成形的确定以盒形件能一次拉深的极限比值H/r来确定,见下表。当r/B<0.05时,H/r仍按r/B=0.05栏内数值取;当r/B>0.4～0.5时,按圆筒形件拉深计算,其拉深系数m则按圆筒形件拉深系数表值取。各符号见图1。
During the process of designing box-shaped drawing dies, it is an important step to ensure the quality of mold design and economic benefits to determine whether the box-shaped pieces can be drawn and formed once and the shape and size of the blank. After years of practice and theoretical exploration, I conclude the following concise method. After production verification, basically able to achieve more satisfactory results. First, the box-shaped pieces of a deep drawing to determine the box-shaped pieces of drawing a limit to the ratio of H / r to determine, see the table below. When r / B <0.05, H / r is still within r / B = 0.05 column value; when r / B> 0.4 ~ 0.5, according to the cylindrical part drawing calculation, the drawing coefficient m according to the round Cylinder drawing coefficient value of the table to take. The symbols shown in Figure 1.