随着机械加工的不断发展,对零件精度要求越来越高,而在加工过程中,形状误差是不可避免地存在,这必将影响零件精度及其配合,所以,必须综合考虑尺寸和误差两个因素的影响,为此,国标规定了极限尺寸的判断原则。本文着重分析了极限尺寸判断原则的正确应用及相关术语。 With the continuous development of machining, the precision of parts is getting higher and higher, and in the process of machining, the shape error is inevitably exist, which will affect the accuracy of parts and their cooperation, so, we must consider the size and error of two The impact of a factor, this standard, the national standard provides the principle of determining the size of the limit. This article focuses on the analysis of the correct application of the principle of limit size and related terms.