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我厂生产的JH70型摩托车部份零部件,其中油泵键轮轴套(图1)系薄壁钢套零件,材料为20号钢。我厂初次生产时采用的工艺是:内孔分两次铰孔至φ5.5_0~(+0.012)尺寸,由于该材料心部组织软,内孔加工时粘刀现象严重,故内孔表面划痕深,尺寸精度和表面粗糙度难于保证,报废率达95%。针对此问题,我们对加工工艺进行了改进,获得了良好的效果。改进后的工艺方法是:在粗钻、铰内孔之后,分两次冷挤压加工。为了考虑到内孔的收缩量,我们作了系统的抽样调查统计,最终确定了精挤压工序所用挤光冲的具体尺寸,见图2。零件加工主要工序安排是:粗挤压内孔至φ5.45_0~(+0.012)→时效24小时→精挤压内孔至φ5.5_0~(+0.012)→时效24小时→以内孔定位磨外圆至
I plant parts JH70 motorcycle parts, pump key shaft sleeve (Figure 1) thin-walled steel sleeve parts, the material is 20 steel. I plant the first production process is used: the hole reaming at two times to φ5.5_0 ~ (+0.012) size, the core material of the soft tissue, the inner hole processing sticky knife phenomenon is serious, so the inner surface of the hole plan Deep marks, dimensional accuracy and surface roughness is difficult to guarantee, scrapped rate of 95%. In response to this problem, we have improved the processing technology and achieved good results. Improved technology is: After the rough drilling, reaming the hole, two cold extrusion process. In order to take into account the amount of shrinkage in the borehole, we made a systematic sample survey and finalized the exact dimensions of the squeezing light used in the precision extrusion process, as shown in Figure 2. The main process of parts processing arrangements are: rough extrusion bore to φ5.45_0 ~ (+0.012) → aging for 24 hours → fine extrusion bore to φ5.5_0 ~ (+0.012) → aging for 24 hours → with the hole positioning outside the mill Round to