Measuring Procedure for Stylus-type Surface Roughness Instruments

Measuring procedure for stylus-type surface roughness instruments

用手写笔型表面粗糙度测量仪器测量表面粗糙度的程序如下（这是iOS 4288：1996的摘录）。

STEP1Position the measurement target.

STEP2Visually inspect the surface of the target.

STEP3-1When the sampling length is represented pictorially

When the sampling length is indicated on the figure or in the requirements of the product’s technical information, set the cutoff value, λc, to the indicated sampling length.

STEP3-2When the roughness profile is periodic

1. For target surfaces that have a periodic roughness profile, estimate parameter RSm from the measured primary profile.
2. Determine the corresponding sampling length (cutoff value λc) from Table 1 by using the estimated RSm.

Table 1. Sampling lengths for measurement of the parameters of periodic roughness profiles and for measurement of the RSm of periodic/non-periodic profile curves

3. Use the determined sampling length to measure the RSm value.
4. When the measured RSm is within the RSm range estimated from Table 1, use the cutoff value. When the measured result is outside the estimated RSm range, change the cutoff value to the sampling length of the corresponding RSm.
5. Use the sampling length that you have determined with the steps up to this point to measure the required parameters.

STEP3-3When the roughness profile is not periodic

1. For target surfaces that have a non-periodic roughness profile, estimate the unknown parameter Ra, Rz, or RSm from the measured primary profile.
2.使用估计的未知参数RA，RZ或RSM确定从表1到表3的相应采样长度（截止值λc）。

Table 2. Roughness parameters Ra, Rq, Rsk, Rku, and R⊿q of non-periodic profile curves, load curve BAC, probability density function ADF, and the sampling length of the related parameters

表3.非周期性轮廓曲线的粗糙度参数RZ，RV，RC和RT的采样长度

3.使用确定的采样长度来测量粗糙度参数的值。
4.当测量结果在估计的RA或RZ范围内从表1到表3范围时，请使用截止值。当测得的结果超出估计的RA或RZ范围之外，将截止值更改为对应于测得的RA或RZ的范围的采样长度。
5. Use the sampling length that you have determined with the steps to this point to measure the required parameters.

STEP4Judge whether the parameters are within the threshold limit values from the measured results.

Use the visual inspection from step 2 to determine whether the target’s surface texture is uniform (periodic) or is different in various locations (non-periodic).

Case.1 The target’s surface texture is uniform.

比较从整个目标表面测量的参数与图中指示的所需值或产品的技术信息中的所需值。然后，根据16％的规则或最大值规则来判断参数是否在允许的范围内。

Case.2 The target’s surface texture is different in various locations.

Compare the parameters determined from various locations on the target against the required values indicated on the figure or in the product’s technical information. Then, judge whether the parameters are within the permissible ranges according to the 16% rule or the maximum value rule.