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在机械加工中,根据被加工的精度要求来确定所用铰刀的公差。孔的精度不同,铰刀的公差也不一致。为了设计和制造的方便,力求简便、统一,又由于贯彻新的国家标准,有必要做一综合对比。习惯上,饺刀公差带分配原则如图1所示。 A—孔的公差; CD—铰刀直径的上偏差; EF—铰刀直径的下偏差; G—铰刀直径公差; B—铰刀直径制造公差; N—铰刀磨损储备量; ρ_1—最大扩张量; ρ_2—最小扩张量; 国际标准ISO 522—1975铰刀公差带分配原则
In machining, the tolerance of the reamer to be used is determined according to the precision required to be machined. Hole accuracy is different, reamer tolerance is inconsistent. In order to facilitate the design and manufacture, to seek simplicity, unity, and because of the implementation of new national standards, it is necessary to make a comprehensive comparison. Traditionally, the principle of the distribution of tolerance with a knife as shown in Figure 1. A-hole tolerance; CD-upper deviation of reamer diameter; EF-lower deviation of reamer diameter; G-reamer diameter tolerance; B-reamer diameter manufacturing tolerance; N-reamer wear reserve; Expansion volume; ρ_2 - Minimum expansion; International Standard ISO 522-1975 Reamer tolerance band distribution principle