在机械加工中,钻孔约占26～30％。由于钻孔主要使用高速钢麻花钻,切削速度只有20～30m/min,因此实际上钻削占全部切削工时的40％。据统计,钻φ20～60mm的浅孔(孔深≤3D)占钻孔总数的27％左右,也就是占整个切削加工工时的8～10％。一、国外硬质合金可转位浅孔钻概况 70年代中期,国外开始发展硬质合金可转位浅孔钻。1975年首次出现在国际市场上,立即引起广泛重视,被认为是继60年代喷吸钻之后的又一重大突破, In machining, drilling about 26 to 30%. Since drilling mainly uses HSS twist drills, the cutting speed is only 20-30 m / min, so drilling actually accounts for 40% of the total cutting time. According to statistics, shallow holes drilled φ20 ~ 60mm (hole depth ≤3D) accounted for about 27% of the total drilling, which is accounted for 8 ~ 10% of the entire cutting working hours. First, the foreign cemented carbide drill can be transplanted position 70 mid-term, foreign countries began to develop hard alloy indexable shallow hole drilling. First appeared in the international market in 1975, immediately attracted widespread attention, is considered to be another major breakthrough after the jet-suction drill in the 1960s,