一、误差分析弯曲U形工件时,凸模和凹模工作部分尺寸是很容易决定的。如图1所示,凹模尺寸M=St+2S,或凸模尺寸St=M-2S。但是,当在板料上压人的深度T等于料厚s(T=s)时,凸模和凹模的尺寸则不是一下就能看得出来的(图2)。这时,如果仍按上述方法标注凹模和凸模的尺寸,必将是错误的(图3)。因为工件转角处必须进行倒角,于是在图4所示的方块图中就产生了一个增大的距离S＇。 First, the error analysis Bending U-shaped workpiece, punch and die working part of the size is very easy to decide. Shown in Figure 1, the die size M = St + 2S, or punch size St = M-2S. However, the dimensions of the punch and the die can be seen at a glance when the depth T on the sheet is equal to the material thickness s (T = s) (Figure 2). At this point, it is always wrong to label the die and punch as described above (Figure 3). Since the corners of the workpiece must be chamfered, an increased distance S ’results in the block diagram shown in FIG. 4.