内燃机机体主轴承座板孔,是由四段圆弧和四段直线组成的,其几何形状比较特殊,加工也比较困难。过去,在插床上加工,操作者用手摇、脚蹬机床摇把,才能一刀一刀赶出来。加工效率低,劳动强度大。这一直是生产上的关键。我厂机械二车间的同志们要摆脱困境,他们在毛泽东思想的指引下,排除困难,不怕失败,敢于斗争,敢于胜利。他们先后提出了四个 Internal combustion engine main bearing plate hole, is composed of four sections of arc and four straight lines, the geometry of the more special, processing is also more difficult. In the past, the processing in the bed, the operator with a hand, pedal machine crank, knife can only be driven out. Low processing efficiency, labor-intensive. This has always been the key to production. In order to get rid of the difficulties, the comrades in the second workshop of our factory should rule out the difficulties under the guidance of Mao Zedong Thought, not afraid of failure, of daring to struggle and of daring to victory. They have put forward four