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在机械制造中,常常遇到零件表面有不直度的技术要求如图1。在测定这类形状误差,特别是当被测表面较长时,例如某些机床的床身导轨面等,应该如何处理被测得的数据才是该表面的不直度误差量,在作者接触到的一些习惯作法中,有些是不正确的。为了说清楚这个问题,有必要先把中国科学院颁布并于1971年试行的国家标准 GB 130—70附录中关于不直度的定义,和这方面有关部门提出的新标准报批稿中关于不直度的定义作一个介绍。
In machinery manufacturing, often encounter the surface of the workpiece has a non-straightness of the technical requirements shown in Figure 1. In determining the shape of such errors, especially when the measured surface is longer, such as some of the machine bed rail surface, etc., should be how to deal with the measured data is the surface of the degree of error is not straightforward, Some of the common practices that have arrived are incorrect. In order to clarify this issue, it is necessary to first put the Chinese Academy of Sciences promulgated in 1971 the national standard GB 130-70 appendix on the definition of straightness, and new standards submitted by the relevant departments for approval on the degree of non-straightness The definition of an introduction.