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镗刀在未落刀以前离开工件时,镗刀将沿着被加工表面拖出划痕,这样,不仪损坏加工面,而且带来了后患,采用自动伸缩镗刀可解决这些问题。在镗削加工中,尤其精镗加工,划痕是个难题。当镗削结束,刀具迅速从孔内退出时,如果镗刀直接退出,则在内孔表面留下退刀痕迹。这些划痕有两种形式,如果刀具和工件正在旋转而迅速退刀,则划痕是螺旋形的;如果刀具和工件停止转动时退刀,则造成的划痕是沿孔壁的轴向呈直线形。无论是那种形式的划痕,都可能导致一些内孔表面质量要求高的精
Boring knife before leaving the workpiece without leaving the knife, the boring tool will be scratched along the surface to be machined, so that does not damage the machined surface, but also brought trouble, the use of automatic retractable boring knife to solve these problems. In the boring process, especially fine boring process, scratches is a problem. When the boring end, the tool quickly exit from the hole, if the boring tool directly exit, leaving the surface of the hole retract marks. There are two forms of these scratches. If the tool and the workpiece are rapidly rotating, the scratch will be spiral. If the tool and workpiece stop rotating, the scratches will be along the axial direction of the hole wall Straight. No matter what kind of scratches, may result in some fine quality of the inner surface of the hole