GB/T 1182-2018Geometrical product specifications (GPS) -- Geometrical tolerancing -- Tolerances of form, orientation, location and run-out (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 1182-2008 "Geometrical product specification

(GPS) - Geometrical tolerancing - Tolerances of form, orientation, location and

run-out". Compared with GB/T 1182-2008, the main technical changes are as

follows.

- ADD a three-dimensional annotation legend, to the visual annotations, that

interpret the technical specifications;

- ADD the interpretation and marking method of the concept of variable width

tolerance zone;

- ADD the interpretation and marking method of the concept of offset

tolerance zone;

- ADD the interpretation and marking method of the concept of filter

specification features;

- ADD the interpretation and marking method of the concept of the reference

element's fitting specification feature;

- ADD the interpretation and marking method of the concept of full surface;

- ADD the interpretation and marking method of the concept of intersection

planes;

- ADD the interpretation and marking method of the concept of orientation

plane;

- ADD the interpretation and marking method of the concept of directional

features;

- ADD the interpretation and marking method of the concept of collection

plane;

- ADD the clear rules and default rules of the geometrical tolerance zone;

- ADD the filtering rules.

This standard uses the redrafting method, to amend and adopt ISO 1101.2017

"Geometrical product specification (GPS) - Geometrical tolerancing -

Tolerances of form, orientation, location and run-out".

Compared with ISO1101.2017, this standard has technical differences. The

terms, which are involved in these differences, have been marked by a vertical

single line (︱) on the outer margins. The corresponding technical differences

and their reasons are as follows.

- Regarding normative references, this standard has adjusted the technical

differences, to adapt to China's technical conditions. The adjustments are

reflected in Chapter 2 "Normative references". The specific adjustments are

as follows.

* USE GB/T 4249-2018, which modifies and adopts international

standard, to replace ISO 8015.2011;

* USE GB/T 4457.4-2002, which modifies and adopts international

standard, to replace ISO 128-24.1999;

* USE GB/T 13319, which identically adopts international standard, to

replace ISO 5458;

* USE GB/T 16671-2018, which modifies and adopts international

standard, to replace ISO 2692.2014;

* USE GB/T 17851, which modifies and adopts international standard

ISO 5459;

* USE GB/T 17852, which modifies and adopts international standard

ISO 1660;

* USE GB/T 19096, which identically adopts international standard, to

replace ISO 13715;

* USE GB/Z 24637.1, which identically adopts international standard, to

replace ISO 17450-1.2011;

* USE GB/Z 24637.2, which identically adopts international standard, to

replace ISO 17450-2;

* USE GB/T 24734, which non-equivalently adopts international standard,

to replace ISO 16792;

* USE GB/Z 26958 (all parts) to replace ISO/TS 16610 (all parts). Refer

to Appendix G, for the degree of consistency between various parts of

the two standards.

This standard also made the following editorial changes.

- DELETE Table 1 in the introduction of ISO 1101.2017.CHANGE "Table 2

~ Table 10" in ISO 1101.2017 to "Table 1 ~ Table 9".

- ADD Appendix G (informative) - The degree of consistency between various

parts of the two standards GB/Z 26958 and ISO/TS 16610;

- CHANGE the Appendix G of the original ISO 1101.2017 into Appendix H.

This standard was proposed by AND shall be under the jurisdiction of the

National Standardization Technical Committee for Product Geometric Technical

Specifications (SAC/TC 240).

Drafting organizations of this standard. China Productivity Center for Machinery,

China Aviation Technology Research Institute, Zhengzhou University, SAIC

Motor Corporation Technology Center, Beijing Automotive Co., Ltd., Omanco

(Shanghai) Consulting Co., Ltd., Pan Asia Automotive Technology Center Co.,

Ltd., Dekey (Beijing) Technology Co., Ltd., Xi'an Jiaotong University, SAIC-GM-

Wuling Automobile Co., Ltd., Qoros Automobile Co., Ltd., Carl Zeiss (Shanghai)

Management Co., Ltd., Dalian Institute of Technology, Hexagon Survey

Technology (Qingdao) Co., Ltd., Shanghai Institute of Metrology and Testing

Technology.

1 Scope

This standard defines the symbols and description rules, for the geometrical

tolerance specifications of workpieces.

This standard gives the basic principles of geometrical tolerance specifications.

The legends in this standard are intended to illustrate how to use visual

annotations (including annotations, such as TED), to fully interpret technical

specifications.

2 Normative references

The following documents are essential to the application of this document. For

the dated documents, only the versions with the dates indicated are applicable

to this document; for the undated documents, only the latest version (including

all the amendments) is applicable to this standard.

GB/T 4249-2018 Geometrical product specifications (GPS) - Fundamentals

- Concepts, principles and rules (ISO 8015.2011, MOD)

GB/T 4457.4-2002 Mechanical drawings - General principles of presentation

- Lines (ISO 128-24.1999, MOD)

3 Terms and definitions

The terms and definitions, as defined in GB/T 4249-2018, GB/Z 26958 (all

parts), GB/Z 24637.1, GB/Z 24637.2, ISO 17450-3, ISO 22432, ISO

25378.2011, as well as the following terms and definitions, apply to this

document.

A single feature, that is seamlessly combined by multiple single features.

The plane, which is established by the features on the workpiece. It is used

to define a closed compound continuous features.

4 Basic concepts

At present, the detailed separation rules (defining the boundaries of the

measured features) have not been formulated in the GPS standards.

- The location specification can control the location deviation, direction

deviation, form deviation of the measured feature.

- The direction specification can control the direction and form deviation of

the measured feature, BUT it cannot control its location.

5 Symbols

The symbol definitions, which are used in the symbol part of the tolerance grid,

are as shown in Table 1.

6 Measured features

Unless otherwise specifically marked, the geometrical tolerance specification

applies to a single complete feature. When the measured feature is not a single

complete feature, see 8.4.2, Chapter 9, Chapter 11.

* The arrow can be placed on the horizontal leader line AND use the

leader line to point to the area feature [see Figure 3a)].

When the geometrical tolerance specification is applicable to the derived

features (center line, center plane, or center point), it shall be marked in one of

the following ways.

7 Tolerance zone

Unless otherwise marked with graphics, the tolerance value remains constant,

along the length direction of the measured feature.

For derived features, if the tolerance zone of the derived feature consists of two

parallel planes AND is used to constrain the centerline, OR it is composed of a

cylinder AND is used to constrain the center point of a circle or sphere, the

orientation plane grid shall be used to control the direction of the plane or

cylinder.

8 Marking of specification of geometrical tolerances

Tolerance requirements shall be marked in a rectangular grid, which is divided

into two or three parts. The optional datum part of the third part may contain

one to three grids. As shown in Figure 12, these parts are arranged in order

from left to right.

The tolerance value is a mandatory specification feature. Tolerance values shall

be given, in the units which are used for linear dimensions. The width of the

tolerance zone, which is given by the tolerance value, is perpendicular to the

measured feature, by default.

The tolerance zone has a constant width, by default. If the width of the tolerance

zone changes linearly between two values, these two values shall be marked

separately with "-", as shown in Figures 14 and 7.2.

9 Additional markings

If the characteristic is to be applied as a set of all required tolerance zones, to

the measured feature, for example -- the tolerance zones of all features are in

a theoretically exact relationship with each other; the transition area from one

tolerance zone to the next, is the extension of these two tolerance zones,

meanwhile forms a sharp angle -- THEN, CZ (combined tolerance zone) shall

be used together with the "full circumference" or "full surface" symbol. For the

abolished marking method, see A.3.4.

......