由于拉削工艺条件的限制,拉刀必须具有高的抗压强度和耐磨性及高的韧性。拉刀与其它切削刀具相比,其切削刃几何形状复杂,因此重磨费用高,对于使用该种刀具经济效果影响很大。为了减少刀具的重磨费用和提高被加工工件的精度,对拉刀的耐磨性或耐用度提出了较高的要求。用粉末冶金高速钢拉刀作切削性能的试验表明,这种刀具能满足要求。图1所示为汽车的球面套筒,它是用渗碳钢制成的。为了减少 Due to broaching process conditions, the broach must have high compressive strength and wear resistance and high toughness. Compared with other cutting tools, broaches have complex geometry of cutting edges, so the heavy grinding cost is high, which greatly affects the economic effect of using this kind of cutting tools. In order to reduce the cost of tool grinding and improve the accuracy of the workpiece to be machined, broach wear resistance or durability put forward higher requirements. With powder metallurgy high-speed steel broach for cutting performance tests show that this tool to meet the requirements. Figure 1 shows the car’s spherical sleeve, which is made of carburized steel. To reduce