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在航空与肮天精密零件（特别是液压精密件）的孔加工中，铰削加工应用普遍，但难度也较大，用肉眼观察或通过圆度仪测定，铰削的孔多数呈多边形，国内对这个重要质量问题的研究、报导尚少。本文主要根据近几年来的有关外文资料，综合介绍多边形的生成原因、测试原理、实验结果、边（角）数计算方法、改善铰孔圆度的途径等。可供从事铰刀科研、设计、制造、使用的同志参考。
In the aviation and Dirty day precision parts (especially hydraulic precision parts) hole processing, reaming processing applications are common, but also more difficult, with the naked eye or through the circularity measurement, the majority of reaming holes polygon, the domestic Research on this important quality issue is still rare. This article mainly based on the foreign language data in recent years, a comprehensive introduction to the reasons for the formation of polygons, test principles, experimental results, calculation of edge (corner) number, ways to improve reaming roundness and so on. Reamer engaged in scientific research, design, manufacture, use comrades reference.