GB/T 15757-2002 in English

《GB/T 15757-2002产品几何量技术规范（GPS） 表面缺陷 术语、定义及参数》由TC240（全国产品几何技术规范标准化技术委员会）归口，主管部门为国家标准化管理委员会。
本标准确定了有关表面缺陷的术语，允许表面缺陷的程度及测量表面缺陷方法的技术规范等内容。本标准适用于技术文件、技术图纸和科技出版物等。本标准的定义不涉及表面粗糙度和表面波纹度。本标准没有指出是否要进行表面缺陷的评定，这取决于具体的应用或表面的功能。对于特殊的应用和制造工艺，在必要情况下可附加专用的术语和定义。这些术语和定义将在相关的标准中规定。几种特殊表面缺陷将在其他标准中定义。

Geometrical Product Specifications (GPS)—
Surface imperfections—
Terms, definitions and parameters

1 Scope

This standard defines terms relating to surface imperfections in order to establish a common vocabulary to be used in technical documents, technical drawings, scientific publications, etc. to specify to what extent surface imperfections are allowed and to aid in the specification of methods of measuring surface imperfections.

The surface imperfections defined in this standard are not related to surface roughness or surface waviness.

It does not specify the desirability or undesirability of surface imperfections, which depend on the application or function of the surface.

For specific applications and manufacturing processes, additional terms and definitions may be necessary. Such terms and definitions will be specified in relevant standards.

Some types of specific surface imperfections are defined in other standards as well.

2 General terms and definitions

2.1
reference surface
surface, having the form of a geometrical surface, from which the parameters of surface imperfections are assessed

Notes:

1 The reference surface passes through the highest peak of the real surface excluding the imperfections, and is equidistant from the mean surface determined by the least squares method.

2 The reference surface is determined over a specified surface area, or over a limited part of the surface area related to the size (dimensions) of a single imperfection, the size of the area being sufficient to assess the imperfection while suppressing the influence of form deviation on the assessment.

3 The reference surface has a geometric surface and coincides in practice with the surface of the area adjacent to the imperfection.

2.2
surface imperfection evaluation area (A)
portion of the real surface or the whole real surface of a workpiece on which surface imperfections are specified and inspected

Foreword I
ISO Foreword II
1 Scope
2 General terms and definitions
3 Characteristics and parameters of surface imperfections
4 Specific types of surface imperfections
Annex A (Informative) Relation to the GPS matrix model
Index in English