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铰刀的直径尺寸在很大程度上决定加工孔的尺寸,而磨损引起的孔的变化剧烈程度则决定铰刀的使用寿命,所以,重要的是不但要正确规定制造铰刀的公差范围,而且要正确规定铰刀直径下限使用尺寸的界限。因为伴随铰刀的切削过程产生着孔的扩张现象(很少收缩),以相对于孔径的上偏差减去扩张量p_1建立铰刀直径的上限尺寸(图1a)。通常扩张量p_1取等于2级精度孔和3级精度孔公差的1/3,这是适用于在普通结构钢上铰孔的情况。为了阐明在机器制造中广泛应用的不锈钢上铰孔的扩张特性、铰刀的刀齿磨损和切削规范参数变化之间的关系,以及为了确定铰刀的
The diameter of the reamer largely determines the size of the hole to be machined, and the severity of the hole changes due to wear and tear determines the life of the reamer, so it is important not only to correctly define the tolerance range for making the reamer, but also Correctly define the limit for the size of the lower limit of the reamer diameter. Since expansion of the hole (with little contraction) occurs with the cutting process of the reamer, the upper limit of the reamer diameter is established by subtracting the expansion amount p_1 from the upper deviation of the hole diameter (Fig. 1a). Normally, the expansion amount p_1 is equal to 1/3 of the tolerance of the second-grade accuracy hole and the third-order precision hole, which is suitable for the case of reaming holes in ordinary structural steel. In order to clarify the expansion characteristics of stainless steel reaming holes, which are widely used in machine construction, the relation between the cutter wear of the reamer and the variation of the cutting specification parameters, and in order to determine the reamer