孔加工是拖拉机的箱体零件(如变速箱壳体、后桥壳体、提升器壳体等)的关键工序,由于受到工件孔径尺寸等因素的限制,可能使刀具的刚度不足、排屑困难、切削液不易引入,所以难度较大。限于目前我国各工厂的装备和技术水平。孔加工、尤其是精密孔加工,常常成为生产中的关键。影响孔加工的因素很多,从全面质量管理观点来考虑,它是由机床(包括夹具)、工件毛坯或材料、加工方法、测量和操作者五大因素决定的。通常是用直观的因果分析图即“鱼刺图”(图1)来表示,以便找出 Hole machining is the key process of tractor box parts (such as gearbox housing, rear axle housing, riser housing, etc.). Due to the limitation of workpiece aperture size and other factors, the rigidity of the tool may be insufficient and the chip evacuation is difficult , Cutting fluid is not easy to introduce, so difficult. Limited to the current equipment and technical level of our factories. Hole machining, especially precision hole machining, is often the key to production. There are many factors that affect hole machining. From a total quality management point of view, it is determined by the five factors of the machine tool (including the fixture), the workpiece blank or material, the machining method, the measurement, and the operator. This is usually indicated by an intuitive causal analysis called “fishbone map” (Figure 1) to find out