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中径合格与否直接影响螺纹的旋合性和连接质量,因此应该对影响螺纹连接的最重要的基本要素——中径,作些认真的分析和研究,并对其尺寸的合格性作出明确的判断。(一)基本概念在讨沦螺纹中径合格性判断原则之前,首先讨论一下有关“巾径”的术语定义,这对于统一概念,统一理解是十分必要的。1．什么是中径按照新国标的规定,中径是一个假想的圆柱面的直径,该圆柱的母线通过牙型上沟槽和凸起宽度相等的地方,如图1所示。
Whether the diameter is qualified or not will have a direct effect on the screw connection and the quality of the threads. Therefore, careful analysis and research on the most important basic element affecting the screw thread connection should be made, and the specification of the dimensions should be made clear Judgment. (A) the basic concepts Before discussing the principle of judging the qualifications of thread diameter, we first discuss the definition of the term “scarlet”, which is very necessary for the unification of concepts and a unified understanding. 1. What is the diameter According to the new national standard, the diameter is an imaginary cylindrical diameter, the cylindrical bus through the teeth on the groove and the protrusion width equal to, as shown in Figure 1.