ISO 21204:2020 产品几何规范（GPS） 过渡规范

标准编号：ISO 21204:2020

中文名称：产品几何规范（GPS） 过渡规范

英文名称：Geometrical product specifications (GPS) — Transition specification

发布日期：2020-02

标准范围

本文档为特征之间的扩展边缘过渡特征的规范定义了许多规范运算符。边缘过渡特征是连接两个相邻积分特征的积分特征。延伸边缘过渡特征包括相邻特征的部分。所有这些规范都适用于扩展边过渡特征中定义方向上的任何线。本文件还定义了此类过渡规范的规范修饰符和图纸指示。还规定了要使用的图形符号的比例和尺寸。本文档中定义的规范适用于相对简单的边缘过渡功能，例如确保装配无干涉。对于更复杂的功能，几何公差提供了更精确的工具。本文旨在仅限于两个平面之间以及圆柱体与名义上垂直于其的平面之间的边缘过渡特征。附录A给出了识别公差特征和相邻参考部分的算法的第一种方法。随着更多经验的积累，该算法可能会发生变化。本文档提供了一组工具来表达几个过渡规范。它不提供任何关于函数或用途与转换规范之间关系的信息。注1拐角（三个或更多特征之间的过渡）不是边缘过渡特征，因此不在本文档中。注2:边缘过渡特征存在于两个单一特征之间。定义的边缘过渡特征具有定义的标称形状并且不尖锐(r=0)。

This document defines a number of specification operators for the specification of extended edge transition features between features. An edge transition feature is an integral feature connecting two adjacent integral features. The extended edge transition feature includes portions of the adjacent features. All these specifications apply to any line in a defined direction in the extended edge transition feature. This document also defines the specification modifiers and the drawing indications for such transition specifications.The proportions and dimensions of the graphical symbols to be used are also specified.The specifications defined in this document are suitable for relatively simple edge transition functions, for example ensuring assembly without interference. For more complex functions, geometrical tolerancing offers more precise tools.This document is by intention limited to only edge transition features between two planes and between a cylinder and a plane nominally perpendicular to it.Annex A gives the first approach for an algorithm to identify toleranced features and adjacent reference sections. This algorithm is subject to change as more experience is gathered.This document provides a set of tools to express several transition specifications. It does not present any information on the relationship between a function or a use and a transition specification.NOTE 1 Corners (the transition between three or more features) are not edge transition features and are consequently not covered by this document.NOTE 2 An edge transition feature exists between two single features. A defined edge transition feature has a defined nominal shape and is not sharp (r = 0).

标准预览图