摘要
本文分析了镗刀退出时划伤孔表面的原因，提出改进镗杆和机床工作台结构来消除划伤孔表面的措施。
This paper analyses the cause of cutting finished hole surface as the boring cutter is drawn out,and puts forward measures of dispelling cutting finished hole surface by means of changing the construction of the boring bar or the table of the boring machine.
