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过去在计算工件加工后的表面粗糙度时,常用表面微观不平度的轮廓最大高度Ry来确定。但在国标《GB1031—68》中,多采用平均算术偏差Ra评定表面粗糙度;在国际标准《ISO—R468》中,多数国家也是采用平均算术偏差Ra。为了进一步标准化,本文对机械加工中直接计算出表面粗糙度Ra进行探讨。一、平均斜率△a 从加工工件后的表面轮廓看,轮廓的斜度是轮廓或在弯曲情况下的切线与平行于中线的一条直线所成的角度(按斜率度表示),如图1所示。i点的斜率为tgα_i,则工件在取样长度内轮廓所有点(i=1,2,…n)的斜率之和除以n,得平均斜率△a。
In the past in the calculation of the workpiece surface roughness after processing, the surface roughness is often used to determine the maximum height of the micro-roughness Ry. However, in the national standard “GB1031-68”, the average arithmetic deviation Ra is mostly used to evaluate the surface roughness. In the international standard “ISO-R468”, the average arithmetic deviation Ra is also adopted by most countries. In order to further standardize, this paper directly to calculate the surface roughness Ra in machining. First, the average slope △ a From the surface profile after processing the workpiece, the profile of the profile is the slope of the profile or in the case of bending and parallel to the midline of a straight line angle (according to the degree of slope), as shown in Figure 1 Show. The slope of point i is tgα_i, then the sum of the slopes of the profile at all points (i = 1, 2, ... n) of the sample length divided by n gives the average slope Δa.