在进行孔加工时,经常迂到强度大、硬度高的工件,如高锰钢、淬火钢、铸件表皮氧化层等。尤其碰到小孔加工(小于φ15毫米的孔),钻不动或很费力,钻头很快损坏。如果用硬质合金钻头来解决这个矛盾是可以的,但一般工厂不可能具备各种规格尺寸的硬质合金钻头。为此,我们用普通麻花钻头,通过反复实践、摸索,找到一种适应钻削强度大、硬度高材料 In the hole processing, often roundabout to the strength, high hardness of the workpiece, such as high manganese steel, hardened steel, oxide skin castings and so on. In particular, small hole processing (less than φ15 mm hole), drilling can not move or laborious, the drill quickly damaged. If the carbide drill bit to solve this conflict is possible, but the general factory can not have a carbide drill of various sizes. To this end, we use ordinary twist drill, through repeated practice, exploration, to find a drill to adapt to the strength, high hardness of the material