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旧国家标准GB1031-68将表面光洁度分成14个级别),其等级由整数“1”至“14”顺序排列。新国家标准GB1031-83将表面粗糙度规定了三个参数,即轮廓算术平均偏差Ra;微观不平度十点平均高度Rz和轮廓最大高度Ry。其中Ra从0.008～100μm共分42个系列值,Rz和Ry从0.02～1600μm共分49个系列值。由于新旧国家标准对应关系复杂,表格难于记忆现推荐如下两组公式,可以帮助你在现场记忆或换算。旧国家标准▽1～▽5对应新国家标准第一系列的换算式为: Ra=50×2~(-n)～50×1~(1-n) (1) Rz=Ry=200×~(-n)～200×2~(1-n) (2) 旧国家标准▽6～▽13对应新国家标准第
The old national standard GB1031-68 will be divided into 14 levels of surface finish), the rank order of the integer “1” to “14”. The new national standard GB1031-83 specifies the three parameters of the surface roughness, namely, the arithmetic average deviation Ra of the profile; the ten-point average height Rz of the micro-irregularity and the maximum height Ry of the profile. Among them, Ra is divided into 42 series values from 0.008 ~ 100μm, Rz and Ry are divided into 49 series values from 0.02 ~ 1600μm. Due to the complex relationship between the old and new national standards, the form is difficult to remember Now recommend the following two sets of formulas that can help you in the field memory or conversion. The conversion formula of the first series of the new national standard ▽ 1 ~ ▽ 5 corresponding to the new national standard is: Ra = 50 × 2 ~ (-n) ~ 50 × 1 ~ (1-n) (1) Rz = Ry = 200 × ~ (-n) ~ 200 × 2 ~ (1-n) (2) The old national standard ▽ 6 ~ ▽ 13 corresponds to the new national standard