经多次实验验证,采用氧化铝细砂轮对标准麻花钻进行修磨,改变其钻头的几何形状及角度,能使精扩孔和铰孔二道工序一次完成。既提高了生产效率,又节约了刀具材料,对扩铰深度小于70mm的孔确是一个行之有效的好办法。其修磨方法是,将标准麻 After many experiments, the use of alumina fine grinding wheel to repair the standard twist drill to change the geometry of the drill bit and angle, make the reaming and reaming two procedures completed. Not only improve the production efficiency, but also save the tool material, the expansion of the depth of less than 70mm hole indeed is a good way. The grinding method is to standard hemp