GB/T 1239.2-2009Cold coiled helical springs technical specifications - Part 2: Compressions spring (English PDF)

Foreword

GB/T 1239 "Cold coiled helical springs technical specifications" consists of the following three parts. - Part

1 Scope

GB/T 1239.2-2009 is the Chinese national standard on cold coiled helical springs technical specifications - part 2: compressions spring, in the field of mechanical systems and components. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 16 March 2009 by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China, and has been in force since 1 November 2009. Classification: ICS 21.160, CCS J26. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This Part of GB/T 1239 specifies technical requirements, test methods, inspection rules and packaging, marking, transportation and storage requirements for helical compression spring of cold rolled round section cylinder. This Part is applicable to helical compression spring of cold rolled round section cylinder (hereinafter referred to as the spring). The cross-sectional diameter of the spring material is greater than or equal to

0.5 mm. This Part is inapplicable to the spring of special requirements.

2 Normative references

The following documents contain the provisions which, through reference in this Part, become the provisions of this Part of

GB/T 1239.For dated references, their subsequent amendments (excluding corrigendum) or revisions do not apply to this Standard. However, the parties who enter into agreement based on this Standard are encouraged to investigate whether the latest versions of these documents are applicable. For undated reference documents, the latest versions apply to this Standard.

GB/T 1805, Nomenclature of springs

GB/T 4357-1989, Carbon spring steel wires (neq JIS G3521.1984)

GB/T 16947, Helical spring fatigue testing standard

GB/T 18983, Oil - Hardened and tempered steel wire for mechanical springs (

GB/T 18983-2003, ISO/FDIS 8458-3.1992, MOD)

GB/T 21652, Copper and copper alloy wire

JB/T 7367, Magnetic particle inspection for helical compression springs

3 Terms and definitions

For the purposes of this Part of GB/T 1239, the terms and definitions defined in GB/T 1805 apply.

4 Structure type

See Table 1 for the structure type of the spring end.

5 Technical requirements

Products shall be manufactured in accordance with product drawings and technical documents approved by prescribed procedures.

6 Test methods

6.1 Permanent deformation Compress the spring with the test load three times. Measure the change of free height after the second and third compression. When the test load is greater than the compression load, the compression load is regarded as the test load.

6.2 Spring characteristics The spring characteristics are measured on a spring testing machine with an accuracy of not less than ±1%.

6.3 Outer or inner diameter Use general measuring tools or special measuring tools with a division value less than or equal to 0.02mm. The tools with the outer diameter or pitch diameter on the drawing are used to measure the outer diameter. And the maximum outer diameter shall prevail.

6.4 Free height The free height is measured with a general measuring tool or a special measuring tool with a division value less than or equal to

0.05 mm. The maximum outer diameter shall prevail. When the weight of the spring affects the free height measurement, place the spring horizontally for measurement.

6.6 Straightness According to the method shown in Figure 2, place the spring horizontally on a grade-2 accuracy plate. Turn the spring one round. Use a special measuring tool to measure the maximum gap Delta' between the outer circle element line of the spring and the flat plate.

7 Inspection rules

7.1 Sampling inspection The product acceptance sampling inspection shall be in accordance with the provisions of JB/T 7944, or it may be negotiated by both the supplier and the purchaser.