The conical grinding method has four grinding parameters, and for three drill point geometric parameters, the lip clearance angle, chisel edge angle and point angle, the flank configuration is not unique. 麻花钻锥面刃磨方法有4个刃磨参数,当给定外缘转点的结构圆周后角、横刃斜角、锋角这3个结构参数时,后刀面的形状并不唯一。