用钻头加工孔的资料发表甚少,本文阐述硬质合金一次钻铰精孔钻的特点和参数,并突出介绍了刃磨方法和要点。该钻头省略了原加工时钻、扩、铰三步工艺,能一次性地直接钻出精孔,也能高精度扩孔,得到铰孔以上的较高光洁度。已在某些厂矿应用并取得了明显效果。一、钻头特点 Little information is available on drilling holes with drills. This article describes the features and parameters of a hard-alloy drilled-hole drill and highlights the sharpening methods and highlights. The drill omitted the original processing of drilling, expanding, reaming three-step process, can be a one-time direct drilling of fine holes, but also high-precision reaming, reaming above get a higher finish. Has been applied in some factories and mines and achieved significant results. First, the drill features