一、引言表面粗糙度的正确描述和测量在机械零件的设计和制造中有着头等重要的作用,加工的表面质量直接关系到零件(部件和机器)的可靠性和最佳性能。目前,表面粗糙度的评定参数已超过50个,而我国国家标准规定采用的则有R_a、R_z、R_y、S_m、S和t_p(参阅GB 3053-83和GB 1031-83)。这些参数往往只能代表 I. INTRODUCTION Correct description and measurement of surface roughness plays a paramount role in the design and manufacture of mechanical parts. The quality of the machined surface is directly related to the reliability and optimum performance of the parts (components and machines). At present, the surface roughness has been assessed by more than 50 parameters, while our national standards adopt R_a, R_z, R_y, S_m, S and t_p (see GB 3053-83 and GB 1031-83). These parameters can often only represent