GB/T 1239.2-2009 PDF EnglishUS$105.00 · In stock · Download in 9 seconds
GB/T 1239.2-2009: Cold coiled helical springs technical specifications - Part 2: Compressions spring Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 1239.2: Historical versions
Similar standardsGB/T 1239.2-2009: Cold coiled helical springs technical specifications - Part 2: Compressions spring---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT1239.2-2009 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 21.160 J 26 Replacing GB/T 1239.2-1989 Cold coiled helical springs technical specifications - Part 2.Compressions spring Issued on. MARCH 16, 2009 Implemented on. NOVEMBER 01, 2009 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 Structure type... 6 5 Technical requirements... 6 6 Test methods... 11 7 Inspection rules... 14 8 Marking, packaging, transportation, storage... 15 Annex A (informative) Legend... 17ForewordGB/T 1239 "Cold coiled helical springs technical specifications" consists of the following three parts. - Part 1.Extension Spring; - Part 2.Compressions spring; - Part 3.Torsion spring. This Part is Part 2 of GB/T 1239. This Part is a revision to GB/T 1239.2-1989 "Cold coiled helical compressions springs - Technical specifications". During the revision, the effective parts of GB/T 1239.2-1989 "Cold coiled helical compressions springs - Technical specifications" are remained. It revised the content that has become unsuitable. The main technical differences between this Part and the revised standard are as follows. - according to GB/T 1805-2001 "Nomenclature of springs", it revised the symbols such as load, stiffness, and deformation in the original standard; - due to the renewal of materials, a comprehensive review of the referenced material standards has been carried out; replaced the old version cited in the original standard with the latest version that has been revised; - added the selection conditions and direction of spring characteristics; expanded the range of spring winding ratio; - due to the changes in the supply of raw materials, the production and manufacturing models have changed, so it deleted the provisions that use soft conditions such as annealing material; - added the measuring methods of straightness and compression height; - added the classification of spring inspection items; - adjusted the order of chapters so that the order of chapters of GB/T 1239.1~1239.3 is consistent. Annex A of this Part is informative. This Part was proposed by China Machinery Industry Federation. This Part shall be under the jurisdiction of National Technical Committee on Springs of Standardization Administration of China (SAC/TC 235). Main drafting organizations of this Part. Hangzhou Spring Co., Ltd., China Machinery Productivity Promotion Center. The drafting organizations of this Standard. Changzhou Mingjin Spring Co., Ltd., People's Liberation Army 101 Strong Spring Research Institute, Zhejiang Meili Spring Co., Ltd., Zhejiang Jinchang Spring Co., Ltd., Qianjiang Spring Co., Ltd., Wuxi Weifu Accuracy Machinery Manufacturing Co., Ltd. Spring Factory, Beijing Spring Factory, Li Zhou (Fujian) Spring Co., Ltd., Hangzhou Fuchun Spring Co., Ltd., Wuxi Fengli Spring Co., Ltd. Main drafters of this Standard. Jiang Xiaowei, Yang Weiming, Jiang Ying, Shu Rongfu, Cao Huirong, Jiang Xinrong, Wu Gang, Chen Jie, He Yongyi, Yan Shiping, Wang Wei, Zhang Bihong, Zhang Yongsen, Shao Wenwu, You Weiming, Lu Peigen, Zhao Zhipeng. Versions of standard substituted by this Standard are. - GB 1239-1976, GB/T 1239.2-1989. Cold coiled helical springs technical specifications - Part 2.Compressions spring1 ScopeThis 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 referencesThe 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 springs3 Terms and definitionsFor the purposes of this Part of GB/T 1239, the terms and definitions defined in GB/T 1805 apply.4 Structure typeSee Table 1 for the structure type of the spring end.5 Technical requirementsProducts shall be manufactured in accordance with product drawings and technical documents approved by prescribed procedures. 5.1 Materials 5.1.1 The spring generally uses the materials specified in Table 2.If other materials are needed, it shall be negotiated between the supplier and the purchaser. 5.2 Limit deviation level The limit deviation of spring size and characteristics is divided into three grades. 1, 2, 3.Each item level shall be independently selected according to the needs of use. 5.3 Dimensional parameters and limit deviation 5.3.1 Inner diameter or outer diameter The limit deviation of the inner diameter or outer diameter of the spring shall be as specified in Table 3. 5.3.2 Free height The limit deviation of the spring free height H0 is in accordance with Table 4. When the drawing requires the measurement of two points or more of the load, the free height is used as a reference. 5.3.5 Pitch uniformity When the equal-pitch spring is compressed to 80% of the full deformation, its normal-pitch ring shall not touch. The load of the spring compressed to 80% of the full deformation shall not be greater than the test load. The spring pitch value on the drawing is used as a reference. 5.3.7 Face grinding The flattened part of the spring support ring with both ends and flattened tightly is not less than 3/4 of the turn. Its roughness is not greater than Ra12.5.The end thickness is not less than 1/8d. 5.4 Spring characteristics and limit deviation 5.4.1 Characteristics The spring characteristics shall meet the requirements of 5.4.1.1 or 5.4.1.2. Generally, they are not used at the same time. 5.4.2 Limit deviation 5.4.2.1 The limit deviation of the load F under the specified height or deformation is in accordance with Table 7. 5.6 Permanent deformation The permanent deformation of the finished spring shall not be greater than 0.3% of the free height. 5.7 Heat treatment The spring needs to undergo stress relief annealing after forming. Springs formed with beryllium bronze wire need to be aged. Its hardness will not be assessed. 5.8 Surface quality There must be no harmful defects visible to the naked eye on the surface of the spring. 5.10 Other requirements According to needs, the following requirements can be specified for the spring in the product drawing.6 Test methods6.1 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 Δ' between the outer circle element line of the spring and the flat plate. 6.7 Compression height Load with a theoretical pressure less than or equal to 1.5 times. The spring is compressed and then used to measure the height of the spring with a universal measuring tool or a special measuring tool whose graduation value is less than or equal to 0.02mm. 6.8 Surface quality Use visual inspection or use a 5x magnifying glass to inspect the surface of the spring. 6.9 Surface treatment The surface treatment of the spring shall be carried out in accordance with relevant standards or technical agreements.7 Inspection rules7.1 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. 7.2 Product inspection items 7.3 Classification of spring inspection items See Table 10 for the classification of spring inspection items.8 Marking, packaging, transportation, storage8.1 Packaging 8.2 Certificate of conformity The product certificate shall be attached in the package. The certificate includes the following information. 8.3 Marks The outside of the package shall be marked. 8.4 Storage Products shall be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer shall ensure that no corrosion will occur within 12 months from the exit-factory date. 8.5 Others The special requirements for packaging, marking, transportation and storage shall be negotiated between the supplier and the purchaser. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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