直径10mm 以上的金属切削钻头由两种型号的钢制成:切削部分为 P6M5钢,固定部分为45钢。目前,在工厂中,钻头棒状毛胚的切割主要是用砂轮或机械切割机进行的。两种方法都有缺点。砂轮很快磨损,需要附加的刃磨,而且切割宽度较大(4～5mm)。用机械切割时,切削工具很快磨损,切削之后,沿棒的直径方向金属产生较大的塑性变 Metal cutting bits with a diameter of 10 mm or more are made of two types of steel: P6M5 steel for cutting and 45 steel for fixing. At present, in the factory, the cutting of the drill rod blank is mainly carried out by a grinding wheel or a mechanical cutting machine. Both methods have drawbacks. Abrasion of the grinding wheel quickly requires additional sharpening and a large cutting width (4 to 5 mm). With mechanical cutting, the cutting tool wear quickly, after cutting, the metal along the diameter of the rod to produce greater plasticity change