我厂生产的门式起重机中有一个锁环零件,要求用ф6mm的A3圆钢弯成U形,由于生产数量较少,我们设计了手工U形环弯形工具(见图所示)。工具使用时用虎钳夹紧,调整挡料块8至弯形工件所要求的尺寸,紧固螺栓7,压紧挡料块8,将下好尺寸的圆棒料通过转轮2底部半圆槽插入紧固块9вL的ф7mm孔,使头部 The gantry crane produced by our factory has a lock ring part, which is required to be bent into U shape with ф6mm A3 round bar. Due to the small quantity of production, we designed hand-operated U-ring bending tool (see picture). When the tool is used, it is clamped by the vise and the block 8 is adjusted to the size required by the bent workpiece, the bolt 7 is tightened, the block 8 is pressed, the lower bar with a good size is passed through the semicircular groove at the bottom of the wheel 2 Insert ф7mm holes in the fastening block 9вL to make the head