目前在机械加工中,主要还是采用麻花钻钻削实心孔。用麻花钻进行钻削加工,与用单刃和多刃刀具进行加工有很大的区别。钻头的形状及其几何参数必须与被加工材料、加工条件和机床相适应。必须在钻尖处磨出形成钻尖角σ的锥面和在钻头上磨出工作侧后角d_(xe)的后面。这两个角度的大小对切削力、进给力和钻头的磨损有很大的影响。因此在设计和使用麻花钻时,对这两个角度应给予足够的重视,并且必须对每 Currently in machining, the main twist drill or solid hole. Drilling with a twist drill is very different from working with a single-edged and multi-edged tool. The shape of the drill bit and its geometrical parameters must be adapted to the material being processed, the machining conditions and the machine tool. The taper forming the angle a of the drill tip must be ground at the tip of the drill and the back of the work-side relief angle d_ (xe) must be ground off on the drill bit. The size of these two angles has a great impact on cutting force, feed force and bit wear. Therefore, in the design and use of twist drill, these two angles should be given enough attention, and must be for every