直线度误差评定的测量提取点数选择

Study on the Number of Extraction Points for Evaluation of Straightness Error

在其他测量实验条件相同的情况下,采用不同的提取点数,用三坐标测量机对相同直线的部分测量点坐标进行等间距提取,并用最小二乘法评定相同直线不同提取点数下的直线度误差.分析提取点数与直线度误差的关系,提出最佳提取点数的概念,指出直线度误差检测相关标准中必须补充提取点数的要求.

Under same measurement conditions, some point sets were extracted from the linear part of a same part with different number of extraction points on the coordinate measuring machine the straightness error of the measured point sets was computed by the least square method; the relationship between the number of extraction points and the straightness error was analysed; the concept of optimal number of extraction points was put forward, and it is pointed out that the requirements for extraction number must be added in the relevant ISO standard of straightness error measurement.