回转体工件和工具上顶夹用的中心孔,在热处理后往往被搞脏或烧坏,必须加以清理和修正才能进行下一道加工。这项工作一般是在中心孔钻磨床上,用锥尖砂轮进行修磨。但由于锥尖砂轮消耗快,修磨砂轮的次数多,这种方法很不经济。为此,使用如图所示的特制硬质合金锥形锪钻,可省去修磨和调换砂轮的时间,就经济得多。锥形锪钻是用K10硬质合金做锥尖头部,焊牢在中心钻体的孔中。图示为两种锪钻的尺寸和几何形状。经试验,用 Revolving body workpieces and tools on the top folder with the center hole, after heat treatment is often dirty or burned, must be cleaned and modified to the next processing. This work is usually done on a center hole grinder with a bevel grinding wheel. However, due to the rapid consumption of cone-tip grinding wheel, grinding wheel more times, this method is not economical. For this reason, it is much more economical to use the special carbide taper drill shown in the figure to save the time for grinding and changing the grinding wheel. Taper drill is made of K10 cemented carbide tip, welded in the hole in the center of the drill body. Pictured are the sizes and geometries of both drills. After testing, use