GB/T 1239.2-2009 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 1239.2-2009 | English | 105 |
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Cold coiled helical springs technical specifications - Part 2: Compressions spring
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| GB/T 1239.2-1989 | English | 479 |
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Cold coiled helical compressions springs -- Technical specifications
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GB/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 Contents
Foreword... 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... 17
Foreword
GB/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 spring
1 Scope
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.
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 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 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 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.
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, storage
8.1 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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