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我厂生产的3M4750钢球研磨机中的关键零件——活塞杆(图1),材料采用40Cr钢锻件,强度高(б_b=8000～10000kgf/cm~2)、韧性好。原来加工工艺是先用ф50mm接长钻调头钻孔,然后再用单头刀排扩孔至尺寸。切削时,断屑困难,刀具损耗大,需要不断更换刀具和移动尾架。工人劳动强度大,质量不能保证,生产率低,每根耗工时20多小时。现在,我们采用外排屑深孔套料。实践证明,加工质量好,省工省料。目前每根耗工时仅3小时,劳
I produced the factory in 3M4750 ball grinding machine key parts - piston rod (Figure 1), the material used 40Cr steel forgings, high strength (б_b = 8000 ~ 10000kgf / cm ~ 2), good toughness. The original processing technology is the first ф50mm then long drill head drilling, re-use single head reaming to size. Cutting, chip breaking difficulties, tool loss, you need to constantly change the tool and move the tailstock. Workers labor intensity, quality can not be guaranteed, low productivity, each consuming more than 20 hours. Now, we use the outer chip deep hole nesting. Practice has proved that the processing of good quality, provincial labor saving. At present, each labor-hour only three hours, labor