麻花钻头的主后角是后刀面切线与切削平面之间的夹角,是以钻轴为轴心线的圆柱截面内测量的,通常是指主切削刃外缘处的圆周后角。主后角是刃磨钻头时最重要的切削参数,也是整个钻头中主要的几何角度,它在钻孔加工中起着重要作用。一、标准麻花钻头的主后角有待改进在各机械工厂的切削加工中,标准麻花钻头的主后角除少数采用机械刃磨外,绝大多数均由熟练工人手工刃磨,一直以普通的锥面刃磨(即圆锥面的刃磨法)为主。刃磨 The main relief angle of the twist drill is the angle between the flank tangent and the cutting plane and is measured in a cylindrical cross-section centered on the drill axis, usually the circumferential relief angle at the outer edge of the main cutting edge. The main relief angle is the most important cutting parameter for sharpening a drill and is also the main geometric angle of the entire drill, which plays an important role in drilling. First, the standard twist drill bit to be improved after the main corner Machining in the machining plant, the standard twist drill bit apart from the main use of a few mechanical sharpening, the vast majority of manual grinding by skilled workers, has been an ordinary Cone sharpening (conical surface sharpening method) based. Sharpening