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缸体(图1)是凿岩机主要零件之一。材料为20Cr,毛坯为锻件,毛坯重量约12公斤,外形较复杂,初加工内孔时无合适的定位基准。我厂自生产凿岩机以来,这种零件的内孔加工一直是在1K37普通六角车床上利用气动两爪专用卡盘夹持零件进行套料加工的。加工时零件旋转作主运动,刀具只作走刀运动。工作时大部分为手工操作,劳动强度大,注意力需要非常集中,生产效率低(班产30件),质量也不移稳定,多年来都是关键工序之一。我厂革命职工为了改变这种面貌,于74年年初组织了以老工人为主体的“三结合”攻关小组,发
The cylinder block (Figure 1) is one of the main components of a rock drill. The material is 20Cr, rough forgings, rough weighing about 12 kg, the shape is more complex, the initial processing of the hole when no suitable positioning standards. I plant since the production of rock drills, the parts of the hole processing has been in 1K37 common hexagonal lathe pneumatic chuck special chuck holding parts for nesting. Spinning process for the main part of the rotation, the tool only for the knife movement. Most of the time for manual operation, labor-intensive, attention needs to be very concentrated, low productivity (30 production class), the quality is not stable, over the years are one of the key processes. In order to change this aspect, the revolutionary workers of our factory organized the “three combination” research team with old workers as the main body in the beginning of 74