GB/T 45870.2-2025Springs - Measurement and test parameters - Part 2: Cold formed cylindrical helical extension springs (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document is part 2 of GB/T 45870 "Measurement and test parameters of springs". GB/T 45870 has been published in the following parts.

--- Part 1: Cold-formed cylindrical helical compression springs;

--- Part 2: Cold-formed cylindrical helical tension springs.

This document is modified to adopt ISO 22705-2:2023 "Spring measurement and test parameters Part 2: Cold-formed cylindrical spiral tensile testing spring".

This document has the following structural adjustments compared to ISO 22705-2:2023.

--- Chapter 3 of this document corresponds to Section 3.1 of ISO 22705-2:2023;

--- Chapter 4 of this document corresponds to Section 3.2 of ISO 22705-2:2023;

--- Chapter 5 of this document corresponds to Chapter 4 of ISO 22705-2:2023;

--- Chapter 6 of this document corresponds to Chapter 5 of ISO 22705-2:2023;

--- Chapter 7 of this document corresponds to Chapter 6 of ISO 22705-2:2023;

--- Chapter 8 of this document corresponds to Chapter 7 of ISO 22705-2:2023;

--- Chapter 9 of this document corresponds to Chapter 8, Annex A and Annex B of ISO 22705-2:2023.

The technical differences between this document and ISO 27705-2:2023 and their reasons are as follows.

--- Changed the scope (see Chapter 1) to adapt to my country's technological development;

--- Changed the terms and definitions (see Chapter 3) and compiled them in accordance with GB/T 1805 to adapt to my country's technical conditions;

--- Changed the environmental conditions (see Chapter 5) to better suit my country's actual conditions;

--- Changed the measuring and testing instruments (see Chapter 8) to better suit my country's actual conditions;

--- Changed the test method (see Chapter 9), and changed the content of Appendix A (informative) to normative content (9.10), Appendix B (informative) to normative content (9.11), the content of the "Informative" section has been changed to the "normative" section (9.11), which is more in line with my country's actual situation.

Introduction

Cold-formed cylindrical coil spring is a commonly used elastic element, widely used in machinery, chemical industry, aviation, construction and other industries.

GB/T 45870 "Spring measurement and test parameters" is intended to consist of three parts.

--- Part 1: Cold-formed cylindrical helical compression springs. The purpose is to give a cold-formed cylindrical helical compression spring in addition to the dynamic test the general characteristic parameters are given and the relevant measurement and test methods are described.

--- Part 2: Cold-formed cylindrical helical tension springs. The purpose is to give a cold-formed cylindrical helical tension spring in addition to the dynamic test the parameters of the general characteristics of the product are given and their related measurement and test methods are described.

--- Part 3: Cold-formed cylindrical helical torsion springs. The purpose is to give a cold-formed cylindrical helical torsion spring in addition to the dynamic test the parameters of the general characteristics of the product are given and their related measurement and test methods are described.

Spring measurement and testing parameters Part 2: Cold-formed cylindrical helical tension springs

1 Scope

This document specifies the measurement and test methods for the general characteristics of cold-formed cylindrical helical tension springs, in addition to dynamic testing.

This document is applicable to cold-formed cylindrical helical tension springs with round cross-section (e.g., pressed center circle shackles; long arm semicircular shackles).

Formed cylindrical helical tension springs are used for reference purposes.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB/T 1216 Outside micrometer GB/T 21389 Vernier, dial and digital calipers

3 Terms and Definitions

The following terms and definitions apply to this document.

A tension spring is a spring made of a circular cross-section wire wound along its axis into a cylindrical shape with parallel turns or spacing between the coils.

[Source. GB/T 1805-2021, 5.2.2, modified] 3.2 Test parameter for parameters with tolerances, conclusions can be drawn immediately after the test (within or out of tolerance).

NOTE. The test can be performed without quantitative measurement (e.g. using a go/no-go gauge).

bucklingcurvature/bowing the axis of a coil spring bends when it is unloaded or when a load is applied.

[Source. GB/T 1805-2021, 7.42]

4 Symbols and units

The symbols and units given in Table 1 apply to this document. Figure 1 shows the symbols for cylindrical helical tension springs (hereinafter referred to as "springs").