标准摘要
[中文适用范围]： 本文件规定了最终模制零件和由模制零件加工而成的零件的几何尺寸和公差规则。 它还规定了技术产品文件中这些要求的表示规则和惯例，并规定了所使用的图形符号的比例和尺寸。 本文件提供了用于识别模制特征和零件的相对完整性的符号。 这些图形符号与表面纹理的图形符号不同，根据本文档使用与保留在最终零件上的通用基准系统相关的表面轮廓公差指定通用几何公差。 它还规定了通过各种铸造制造工艺生产的所有铸造金属及其合金的铸件的加工余量和拔模角度（锥度）。 本文件确立了一般几何公差表示的一般原则，适用于所有学科和行业的 2D 技术图纸，但也适用于 3D 应用。 注意 所有图形仅以 2D 视图显示。 当加工铸造基准面时，本文件不适用。 [外文原描述]： This document specifies the rules for geometrical dimensioning and tolerancing of final moulded parts and parts machined out of moulded parts. It also specifies rules and conventions for the indications of these requirements in technical product documentation and specifies the proportions and dimensions of the graphical symbols to be used. This document provides symbols for identifying the relative completeness of the moulded features and parts. These graphical symbols differ from the graphical symbols for surface texture according to ISO 1302 [1] , which are notably larger. This document specifies general geometrical tolerances using surface profile tolerances related to a general datum system that remains on the final part. It also specifies machining allowances and draft angles (tapers) for castings in all cast metals and their alloys produced by various casting manufacturing processes. This document establishes the general principles for presentation of general geometrical tolerances that apply to 2D technical drawings in all disciplines and trades but which are also applicable to 3D applications. NOTE All figures are shown in 2D views only. When cast datum surfaces are machined, this document is not applicable. [1] Cancelled and replaced by ISO 21920-1.
英文名称Geometrical product specifications (GPS) — Dimensional and geometrical tolerances for moulded parts — Part 4: Rules and general tolerances for castings using profile tolerancing in a general datum system