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在机械加工中,常碰到与图1类似零件的孔加工。该零件需在已加工好的φ4_0~(0.075)盲孔上钻一台阶孔φ4.459_0~(0.14),作为攻螺纹前的预钻孔。该孔与φ4.459_0~(0.14)孔同轴度为0.05mm。若要一次加工成形两孔,由于孔径小,且较深(一般孔深与孔径之比大于5称为深孔加工),排屑困难,润滑情况较恶劣。加之钴头直径小,强度、刚性不够,在钻头尺寸φ4_0~(0.075)与φ4.459_0~(0.14)交接的空刀槽处容易折断,造成产品零件报废,用扩孔钻、锪钻加工该台阶孔,同轴度不易保证,还需专门工、夹具,比较麻
In machining, often encountered with similar parts in Figure 1 hole machining. The part needs to drill a step hole φ4.459_0 ~ (0.14) on the machined φ4_0 ~ (0.075) blind hole as a pre-tapping hole before tapping. The hole and φ4.459_0 ~ (0.14) hole coaxiality 0.05mm. To form a two-hole processing, due to the small aperture, and deep (generally the ratio of hole depth to hole diameter greater than 5 known as deep hole processing), chip evacuation, lubrication worse. Coupled with the small diameter of cobalt head, strength, rigidity is not enough, the bit size φ4_0 ~ (0.075) and φ4.459_0 ~ (0.14) at the junction of the easy to break off the empty slot, resulting in scrapped parts, reaming drill, Step hole, coaxiality is not easy to guarantee, but also specialized workers, fixtures, more hemp