红旗型爪式粉碎机的筛圈,是一种较薄的圆环类零件。一般是用低碳扁钢弯曲成型,焊接成毛坯,整形后在普通车床上用三爪卡盘夹持加工的。由于圆环薄而直径大,只是三点夹持容易变形,加工后不圆度很大,两端面的平行度也达不到要求。效率低,不能满足生产需要。现在我们改进了工艺,制作了两套专用夹具,夹具由三爪卡盘夹持。加工时,先以圆环外圆为基准,将圆环放入夹具一内(图1),一次装八个圆环。端面压紧后即可车削圆环内孔。将内孔加工好的圆环,以内孔为基准,安装在夹具二上(图2),即可车削圆环 Red flag claw grinder screen ring, is a thin ring type parts. Generally flat low-carbon steel bending, welding into rough, plastic lathe in the ordinary lathe with a three-jaw chuck processing. As the ring thin and large diameter, but easy to deform three-point clamping, processing is not a large roundness, the parallelism of the two ends also failed to meet the requirements. Low efficiency, can not meet production needs. Now that we have improved the process, we have made two sets of special fixtures that are held by a three-jaw chuck. Processing, the first ring to the outer circle as a benchmark, the ring into the fixture one (Figure 1), a loading eight rings. After the end face is pressed, the inner hole of the ring can be turned. The inner hole processed ring, with the hole as a benchmark, installed in the fixture two (Figure 2), you can turn the ring