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机修中,常会遇到带键槽丝杠的修复。修复中,由于丝杠带有键槽,断续切削,刀具会产生不同的切削抗力。当刀具切入键槽口时,工件不起切削作用,切削力为零,当刀具跨越槽口后,开始接触螺纹齿形时,切削力由零逐渐急增,工件表面粗糙度差,同时,带键槽丝杠一般多为细长轴工件,修复中由于螺距较大,齿形大、工件刚性差、加工条件差,既限制切削用量,又易产生切削振动和工件变形。
Machine repair, often encounter keyway screw repair. Repair, the screw with keyway, intermittent cutting, the tool will produce different cutting resistance. When the cutter into the keyway, the workpiece can not afford to cut, the cutting force is zero, when the tool across the slot, began to contact the thread profile, the cutting force gradually increased from zero, the workpiece surface roughness is poor, at the same time, with keyway Mostly for the screw shaft slender shaft workpiece, the repair due to larger pitch, tooth shape, poor rigidity of the workpiece, the processing conditions are poor, not only limit the amount of cutting, but also prone to cutting vibration and workpiece deformation.