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零件表而粗糙度的高低,直接影响其使用性能和工作特性。由于表面粗糙度和表面光洁度在概念、代(符)号上不同,因此给不熟悉表面粗糙度的同志在设计使用时造成困难,现就选用方法简介如下。 1.表面粗糙度高度参数的选用表面粗糙度参数主要指高度特性评定参数,可从下列三项中选取一项或二项: 轮廓算术平均偏差—Ra 微观不平度十点高度—Rz 轮廓最大高度—Ry 在常用参数范围内(Ra为0.025μm～6.3μm,Rz为0.1μm～25μm),推荐优先选用Ra值,以便于测量。 (1) 轮廓算术平均偏差Ra 轮廓算术平均偏差是指在取样长度内轮廓偏距绝对值的算术平均值,其参数值见表1。选用时,应优先选用第一系列参数值。
Parts of the table and the level of roughness, a direct impact on their performance and operating characteristics. As the surface roughness and surface finish in the concept of generation (symbol) on the different, so to those unfamiliar with the surface roughness of the comrades in the design of the use of difficulties, the method of selection are as follows. 1. Surface roughness height parameters of choice Surface roughness parameters mainly refers to the height characteristics of the assessment parameters can be selected from the following three items one or two: contour arithmetic mean deviation -Ra microscopic irregularities ten point height -Rz contour maximum height -Ry is within the range of common parameters (Ra is 0.025μm ~ 6.3μm, Rz is 0.1μm ~ 25μm). It is recommended to use Ra value first to facilitate measurement. (1) arithmetic mean profile deviation Ra outline arithmetic mean deviation refers to the arithmetic average of the absolute value of the outline offset within the sample length, the parameter values shown in Table 1. When used, the first series of parameter values should be selected first.