摘要:
为了对不同机械加工方法形成的表面进行准确的评价,通过计算机和测量仪采集表面轮廓数据,对轮廓展开长度比进行了定量的计算与分析.结果表明:不同机械加工方法形成的表面或不同类型形貌表面的轮廓展开长度比值有较大差异,即使在轮廓算术平均偏差相同时,不同表面的轮廓展开长度比也有明显不同,偏差达44%,由小到大依次是立铣、刨、平磨、平铣.存在差异的原因是轮廓展开长度比包含了整个轮廓的横向、纵向信息.此参数对表面粗糙程度、润滑能力的描述更加细致,它对传统的粗糙度评价体系将是一个有益的补充.
Abstract:
In order to evaluate precisely the surfaces formed from different machining methods, computers and admeasuring apparatus were used to collect the data of surface outlines and quantitatively calculate and analyze the outline expansion length ratio. The results show that the outline expansion length ratios of different surfaces from different machining methods or from different profiles have great difference, even the arithmetic average error of outlines is the same, the outline expansion length ratios from different surfaces are obviously different, errors being as high as 44% and sequently from small to big being end milling, planing, flat grinding and plain milling. The existing of the errors is because the outine expansion length ratio includes the transverse and longitudinal information. The outline expansion length ratio can give a better description of the surface roughness, lubricity, which gives a helpful complement of the traditional surface roughness evaluation system.
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