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图示带钻模导套2的高硬度阶梯式钻头,可用于钻削热机械加工强化了的结构钢零件的通孔,这种钻头沿着整个切削和导向部分,开有二个直排屑槽。在钻头短的切削部分上钎焊标准化的BK8硬质合金刀片1.为使钻头在钻模导套中的位置保持稳定,该钻头大直径的导向部分做得有足够的长度。为了减少钻头与钻模导套之间的摩擦,在导向部分上切去了二块宽的圆柱面,两侧只各留二条窄棱带。应用这种钻头,在热机械加工过的钢件上钻孔时,生产率可提高0.5—1倍,并可提高孔的尺寸精度和表面光洁度。
High-hardness stepped drill with drill guide 2 for drilling through-holes in thermomechanically machined structural steel parts with two straight chips along the entire cutting and guiding section groove. Brazing a Standard BK8 Cemented Carbide Insert on the Short Cut of the Drill 1. To maintain the position of the drill in the drill guide, the large diameter guide portion of the drill is made of sufficient length. In order to reduce the friction between the drill bit and the die guide bush, two broad cylindrical surfaces are cut off on the guide portion, leaving only two narrow strips on each side. With this type of drill bit, productivity can be increased by a factor of 0.5 to 1 when drilling holes in thermomechanically machined steel, and hole dimensional accuracy and surface finish can be improved.