GB/T 131-2006 in English

《GB/T 131-2006产品几何技术规范（GPS） 技术产品文件中表面结构的表示法》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。
本标准规定了技术产品文件中表面结构的表示法。同时给出了表面结构标注用图形符号和标注示例。

1 Scope

This standard specifies the rules for the indication of surface texture in technical product documentation (e.g. drawings, specifications, contracts, reports) by means of graphical symbols and textual indications.

This standard is applicable to the indication of requirements for surfaces by means of:

a) profile parameters, according to GB/T 3505, related to the:

— R-profile (roughness parameters);

— W-profile (waviness parameters);

— P-profile (structural parameters).

b) motif parameters, according to GB/T 18618, related to the:

— roughness motif;

— waviness motif.

c) parameters related to the material ratio curve according to GB/T 18778.2 and GB/T 18778.3.

This standard is not applicable to the indication of requirements for surface imperfections (pores, scratches etc.), reference can be made to GB/T 15757, which covers surface imperfections.

2 Normative References

The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.

GB/T 1182-1996 Geometrical Tolerancing — Generalities, Definitions, Synbiks, Indications on Drawings (eqv ISO1101:1996)
GB/T 3505-2000 Geometrical Product Specifications (GPS) — Surface Texture: Profile Method — Terms, Definitions and Surface Texture Parameters (eqv ISO 4287:2000)
GB/T 4458.4-2003 Mechanical Drawings — Dimensioning
GB/T 6062-2002 Geometrical Product Specifications (GPS) — Surface Texture — Profile Method — Nominal Characteristics of Contact (Stylus) Instruments
GB/T 10610-1998 Geometrical Product Specifications (GPS) — Surface Texture: Profile Method — Rules and Procedures for the Assessment of Surface Texture (eqv ISO 4288:1996)
GB/T 13361-1992 Technical Drawings — General Terms (neq ISO 10209-1:1992)
GB/T 14691.4-2005 Technical Product Documentation — Lettering — Part 4: Diacritical and Particular Marks for the Latin Alphabet (ISO 3098-2:2000, IDT)
GB/T 15757-2002 Geometrical Product Specification (GPS) — Surface Imperfections — Terms, Definitions and Parameters (eqv ISO 8785:1998)
GB/T 18618-2002 Geometrical Product Specification (GPS) — Surface Texture — Profile Method — Motif Parameters (eqv ISO12085:1996)
GB/T 18777-2002 Geometrical Product Specification (GPS) — Surface Texture — Profile Method — Metrological Characteristics of Phase Correct Filters (eqv ISO 11562:1996)
GB/T 18778.1-2002 Geometrical Product Specification (GPS) — Surface Texture — Profile Method — Surfaces Having Stratified Functional Properties — Part 1: Filtering and General Measurement Conditions (eqv ISO 3565-1:1996)
GB/T 18778.2-2003 Geometrical Product Specification (GPS) — Surface Texture — Profile Method — Surfaces Having Stratified Functional Properties — Part 2: Height Characterization Using the Linear Material Ratio Curve (IDT ISO 13565-2:1996)
GB/T 18778.3-2006 Geometrical Product Specification (GPS) — Surface Texture — Profile Method — Surfaces Having Stratified Functional Properties — Part 3: Height Characterization Using the Material Probability Curve (idt ISO 13565-3:1998)
GB/T 18780.1-2002 Geometrical Product Specification (GPS) — Geometrical Features — Part 1: General Terms and Definitions (eqv ISO14660-1:1998)
ISO 81714-1:1999 Design of Graphical Symbols for Use in the Technical Documentation of Products — Part 1: Basic Rules

3 Terms and Definitions

For the purposes of this standard, the terms and definitions given in GB/T 6062, GB/T 3505, GB/T 10610, GB/T 13361, GB/T 18777, GB/T 18618, GB/T 18778.2, GB/T 18778.3, GB/T 18780.1 and the following apply.

3.1
basic graphical symbol
(surface texture) graphical symbol indicating that a requirement for surface texture exists (see Figure 1)

3.2
expanded graphical symbol
(surface texture) expanded basic graphical symbol indicating that material is either to be removed or not removed in order to obtain the specified surface texture (see Figures 2 and 3)

3.3
complete graphical symbol
(surface texture) basic or expanded graphical symbol expanded in order to facilitate the addition of complementary surface texture requirements (see Figure 4)

3.4
surface (texture) parameter
parameter expressing a micro-geometrical property of a surface
Note: See Annex E for examples of surface texture parameter designations.

3.5
(surface) parameter symbol
symbol indicating the type of surface texture parameter
Note: The parameter symbols consist of letters and numerical values (e.g. Ra, Ramax, Wz, Wz1max, AR, Rpk, Rpq).

4 Graphical Symbols for the Indication of Surface Texture

4.1 General

Requirements for surface texture are indicated on technical product documentation by several variants of graphical symbols, each having its own significant meaning. The graphical symbols specified in 4.2 and 4.3 shall be supplemented with complementary surface texture requirements in the form of numerical values, graphical symbols and text (see also Clauses 5 to 8). Attention is drawn to the fact that, in particular instances, the graphical symbols may be used alone to convey a special meaning on the technical drawing.

Foreword II
1 Scope
2 Normative References
3 Terms and Definitions
4 Graphical Symbols for the Indication of Surface Texture
5 Composition of Complete Graphical Symbol for Surface Texture
6 Indication of Surface Texture Parameters
7 Indication of Manufacturing Method or Related Information
8 Indication of the Surface lay
9 Indication of Machining Allowance
10 Summarizing of Indications of Surface Texture Requirements and Their Values
11 Position on Drawings and Other Technical Product Documentation
Annex A (Normative) Proportions and Dimensions of Graphical Symbols
Annex B (Informative) Synoptive Tables
Annex C (Informative) Examples of Indication of Surface Texture Requirements
Annex D (Informative) Minimum Indications for Unambiguous Control of Surface Functions
Annex E (Informative) Surface Texture Parameter Designations
Annex F (informative) Evaluation Length, ln
Annex G (Informative) Transmission Band and Sampling Length
Annex H (Informative) Consequences of This Standard
Annex I (Informative) Former Practice
Annex J (Informative) Relation to the GPS Matrix Model
Bibliography