GB/T 24637.1-2020Geometrical product specifications (GPS) - General concepts - Part 1: Model for geometrical specification and verification (English PDF)

Foreword

GB/T 24637 "General Concept of Product Geometric Technical Specifications (GPS)" is divided into 4 parts.

--- Part 1: Geometry specification and inspection model;

--- Part 2: Basic principles, specifications, operation set and uncertainty;

--- Part 3: The measured elements;

--- Part 4: Quantification of GPS deviations of geometric features.

This part is part 1 of GB/T 24637.

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

This part replaces GB/Z 24637.1-2009 "Product Geometrical Technical Specifications (GPS) General Concept Part 1: Geometrical Specifications and Inspection Model".

Compared with GB/Z 24637.1-2009, the main technical changes are as follows.

--- Added surface model, attribute of ideal element, size parameter, skeleton element, shape, essence, size element, linear size element, Angle dimension element, actual element, component element, derived element, extracted element, filter element, reconstruction element, reconstruction, simplification, change Terms such as change, change curve, etc.; delete the terms such as the constant of ideal elements, the actual surface of the workpiece, bounded elements, unbounded elements;

Changed skin model, geometric elements, ideal elements, non-ideal elements, nominal elements, fitting elements, filtering, combination, characteristics, essence Definitions of terms such as features, deviations, and constant categories (see Chapter 3, Chapter 3 of the 2009 edition);

--- Removed the purpose of the model not directly used as a standard method for determining the geometric characteristics of the workpiece (see 4.2 in the 2009 edition);

--- Added "Relationship between Geometric Elements" (see 6.4);

--- Added "refactoring" content (see 8.1.8);

--- Added the content of "transformation" (see 8.3);

--- Revised the content of "Inspection" (see Chapter 10, Chapter 10 of the 2009 edition);

--- Added informative Appendix E "Constant Categories".

This part uses the redrafting method to modify and adopt ISO 17450-1:2011 "Geometric Technical Specifications of Products (GPS) General Concept Part 1: Models for geometric specifications and inspection".

1) The ISO 17450-1:2011 modified and adopted in this part cancels and replaces ISO 14660-1:1999 (GB/T 18780.1-2002).

The technical differences between this part and ISO 17450-1:2011 and the reasons are as follows.

--- With regard to normative quotation documents, this part has been adjusted with technical differences to adapt to my country's technical conditions and adjustments The situation is reflected in Chapter 2 "Regulatory Reference Documents", with specific adjustments as follows.

- Replaced ISO/IEC Guide 99 with JJF 1001.

The following editorial changes have been made in this section.

--- Modified the error of Figure 1b), deleted the original Figure 3b).

1 Scope

This part of GB/T 24637 provides a model for geometric specifications and inspection, defines the corresponding concepts, and also gives the mathematical basis of the concepts related to the model, and defines the general terminology of the geometrical elements of the workpiece.

The purpose of this section to define the basic concepts of the GPS system is:

--- Provides clear GPS language applied in design, manufacturing, and inspection;

--- Identify elements, features and rules to provide a basis for GPS specifications;

--- Provides a complete symbolic language marked with GPS specifications;

--- Provide simplified symbols by defining default rules;

--- Provides consistent rules for inspection.

This section applies to models in product geometric specifications and inspection.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this document. For the cited documents without date, the latest version (including all amendments) applies to this document.

JJF 1001 General Measurement Terms and Definitions

3 Terms and definitions

The terms and definitions defined by JJF 1001 and the following apply to this document.