几个机加工的单词，请教其准确含义？ rms和ra都是可以用来表示表面粗糙度，rms表示测量所得曲线相对中心线的偏离的均方根值，ra表示相对中心线的偏离算术平均值，单位为微米或微英寸。 转换公式不是ra x 40 = rms（40其实是米和英寸的单位换算）。两者关系可以近似用ra x 1.11 = rms表示，没有准确公式，因为军方根值和平均值没有线性关系。 surface roughness can be measured by a profilometer, a stylus device used to trace across the surface profile. the results are expressed either as ra, which is the arithmetic average deviation from the center line of the surface, or as rms, which is the root mean square of the deviations from the center line. ra or rms values are given in either microns (same as micrometers or µm) or micro-inches (µ"). on drawings, surface roughness is specified as ra in micro-inches. rms will be approximately 11 percent higher than the ra number for a given surface. [ra x 1.11 = rms] root-mean-square【数】均方根(值)查看更多
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