Automobile Suspension Springs Specification
悬架用螺旋弹簧 技术条件
1 Scope
This standard specifies the specification, test method, marking, packaging as well as test and inspection rule of automobile suspension spring (hereinafter referred to as spring).
This standard is applicable to automobile suspension spring (hereinafter referred to as spring).
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending errors in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of the normative document is applicable. For undated references, the latest edition of the normative document applies.
GB/T 224 Determination of Depth of Decarburization of Steel
GB/T 230 Metallic Materials - Rockwell Hardness Test (GB/T 230-991, neq ISO 6508:1986)
GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1: Test Method (GB/T 231.1-2002, eqv ISO 6506-1:1999)
GB/T 1222 Spring Steels (GB/T 1222-1984, neq ISO 4801:1977)
JB/T 7944 Sampling Procedures for Inspection by Attributes of Coiled Helical Springs
QC/T 484-1999 Automobiles Paint Coating
3 Specification
3.1 Materials
3.1.1 Materials specified in GB 1222 or those approved by the customer shall be adopted for spring materials.
3.1.2 Materials must be provided with quality guarantee given by the material manufacturer and may only be used after passing the re-inspection.
3.2 Dimension Parameters and Tolerances
3.2.1 End ring diameter
The diameter tolerance of spring end ring is ±1.5mm.
3.2.2 Total number of coils
Tolerance of the total number of coils for spring is ±1.2% of the total number of coils n1. For spring with unground end ring and installed in irrotational seat, such tolerance shall be strictly required to be ±0.5% of the total number of coils n1.
3.2.3 Pitch uniformity
Where the equal-pitch spring without sheath is compressed to the maximum load, its normal pitch shall not be contacted. The equal-pitch spring with sheath is subject to negotiation between supplier and purchaser.
3.2.4 End ring grinding surface
For grinded spring with tight end ring, the roughness of grinding surface Ra is not less than 6.3μm, the grinding range is not less than 270° and the end thickness shall be (1/4)d±2mm.
3.2.5 Axis straightness
For cylindrical spring under free state, the axis straightness tolerance of spring shall not be greater than 1.5% of the free height H0.
Foreword I
1 Scope
2 Normative References
3 Specification
3.1 Materials
3.2 Dimension Parameters and Tolerances
3.3 Characteristic Requirements
3.4 Hardness and Decarburization
3.5 Fatigue Life and Looseness
3.6 Surface Anti-corrosion Treatment
4 Test Methods
4.1 Dimension
4.2 Characteristics
4.3 Hardness and Decarburization
4.4 Fatigue Test
4.5 Surface Anti-corrosion Test
5 Inspection Rules
5.1 Classification of Inspection Rules
5.2 Defects
6 Marking, Packaging, Transportation and Storage
6.1 Marking
6.2 Packaging
6.3 Transportation
6.4 Storage
6.5 Other
Figure 1 End Shape of Hot-rolled Spring
