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对ZQ28-84《钢球表面粗糙度技术条件》和ZQ4-85《套圈表面粗糙度技术条件》实施以来的一些问题,答复于下。 1.企标制定前,行业在轴承零件的表面粗糙度测量方面存在哪些问题? 主要是评定方法不统一。例如:原一机部部颁标准JB178-60,采用两个表征参数,即不平度的算术平均值H_(jg)(或H_(op))和不平度的平均平方根偏差H_(jf)(或H)。但由于当时行业上只有干涉显微镜,所以只能采用H_(cp)参数。而H_(cp)参数既没有规定计算几个峰谷高度,也没有规定个别峰谷的差别超过多少可以不予计算,因此,测量者往往由于取点方法不同,测量结果差别很大。1968年颁布国家标准GB1031-68,规定用参数R_z代替H_(cp),并给予R_z明确定义,如能严格执行,本不会造成测量结果不统一的问题。但由于受当时情况与仪器所限,致使该标准没有很好贯彻实施,结果依然各行其是。
A few questions since the implementation of ZQ28-84 Steel Ball Surface Roughness Technical Conditions and ZQ4-85 Rings Surface Roughness Technical Conditions have been implemented. 1. Enterprise standard formulation, the industry in the bearing surface roughness measurement of what are the problems? The main assessment method is not uniform. For example: the original machine department issued a standard JB178-60, using two characterization parameters, that is, the average roughness of the arithmetic mean H_ (jg) (or H_ (op)) and the average square root of the unevenness deviation H_ (jf) H). However, since there was only an interference microscope in the industry at the time, only H_ (cp) parameters were used. The H_ (cp) parameter does not specify the calculation of a few peak height, there is no provision for individual peaks and valleys more than the difference can not be calculated, therefore, the surveyor often take the point of different methods, the measurement results vary widely. 1968 promulgated the national standard GB1031-68, provides the parameter R_z instead of H_ (cp), and give R_z a clear definition, if strictly enforced, this will not cause the measurement results are not uniform problem. However, due to the circumstances and equipment limitations, resulting in the implementation of the standard is not well, the result is still its own way.