我们通过三结合,设计、制造了一种加工方孔的钻头,效果良好,提高效率五倍以上。一、刀具材料及几何参数刀具材料采用高速钢 W18Cr4V,热处理硬度R_O62～65。刀具的几何参数如下(见图1):(1)切削部分。端面开有切削齿,前角γ=0°,后角 a=8°,a_1=20。,允许有0.1毫米的刃带。(2)校准部分及导向部分的横截面是由三个圆弧组成,要求三个 R 相等。其截形如图2,圆弧 R 可根据 Through the combination of the three we designed and manufactured a drill bit that drilled a square hole that worked well and increased efficiency five times or more. First, the tool material and geometric parameters Tool material using high-speed steel W18Cr4V, heat treatment hardness R_O62 ~ 65. Geometric parameters of the tool are as follows (see Figure 1): (1) cutting part. The cutting edge has cutting teeth, the rake angle γ = 0 °, the relief angle a = 8 ° and a_1 = 20. , Allowing 0.1 mm land. (2) The cross section of the calibration part and the guide part is made up of three circular arcs, requiring that the three Rs be equal. The truncated figure 2, arc R can be based on