在钢料上钻削φ10mm以下直径的细深孔时,由于钻头直径较小,不便磨成群钴头;用标准麻花钻加工,往往因排屑困难而使钻头折断。我厂在生产实践中吸取了群钻头的优点,将标准钻头刃磨成“零前角,一头豁口偏钻头”(见附图)。现场实践证实了这种钻头克服了标准麻花钻头排屑困难的缺点,因而成倍提高了工效。其钻削原理简述如下: 1、钻削时,65°侧刃首先切削金属;由于该侧开 Drilling φ10mm below the diameter of the deep hole in the steel, the drill bit diameter is small, inconvenient to grind into a group of cobalt head; with standard twist drill processing, often due to difficult chip drill bit broken. I plant in production practice to learn the advantages of group drill bit, the standard drill sharpening into a “zero angle, a breach of partial drill head” (see photo). Field practice confirmed that this drill bit to overcome the shortcomings of the standard twist drill bits difficult to chip, which doubled the ergonomics. The drilling principle outlined as follows: 1, drilling, 65 ° side cutting edge first metal; the side of the open