在现场中,我们对于精确度和表面光洁度要求得较高的孔,除了用磨削加工以外,通常是用“铰刀”来加工的。用铰刀铰出来的孔,精确度能达到2～8级,表面光洁度能达到7～8级(7,8)。这样高的精确度和表面光洁度,对一般零件说来是足够了的。因此,铰孔便成为应用得很广泛的一种加工方法,并且出现了各种类型的铰刀。这里,只打算谈一谈手用柱形直齿铰刀(如图1)的结构、制造方法和 In the field, the holes we require for precision and surface finish are usually machined with “reamers” other than grinding. Reaming with a reamer hole, the accuracy can reach 2 to 8, the surface finish can reach 7 to 8 (7,8). Such a high degree of precision and surface finish is sufficient for normal parts. Reaming has therefore become a widely used machining method and various types of reamers have emerged. Here, we only intend to talk about hand cylindrical reamer (Figure 1) the structure, manufacturing methods and