一、镗刀退出时划伤孔表面的原因镗削加工中，在切削力的作用下，镗杆会产生弹性变形，引起让刀。机床夹具工件系统也会生产远离镗杆轴线的位移Xg（见图1）。镗削完毕后，作用在镗刀和工件上的切削力消失，钱仔的弹性变形和工件的位移Xg恢复，刀尖在被加工表面法向向工件体内产 First, the boring knife exit when the surface of the scratched hole Boring process, the cutting force, the boring bar will have elastic deformation, causing the knife. The machine tool fixture workpiece system also produces a displacement Xg away from the axis of the boring bar (see Figure 1). After the boring is completed, the cutting force acting on the boring tool and the workpiece disappears, the elastic deformation of the money earner and the displacement of the workpiece are recovered, and the tool tip is normalized to the workpiece body on the surface to be machined