The results show that : the whole bit wear process can be divided into three phases ; the regularity of the machining time per hole with the number of holes machined is close to a periodic variation ; higher machining efficiency or working life can be obtained when the drilling pressure and the wall thickness of the bit are advisable 发现钻头的整个磨损过程可分为3个阶段；孔加工时间随孔数近似呈周期性变化；钻压和钻头壁厚适当时，可获得更高的加工效率或者工具寿命。
