BS ISO 18137:2015 pdf download

BS ISO 18137:2015 pdf download.Leaf springs — Technical specifications
1 Scope
This International Standard specifies the technical specifications for leaf springs.
This International Standard is applicable to leaf springs for road vehicle (hereinafter simply “springs”).
The leaf springs for other vehicle may refer to this International Standard.
2 Normative references
The following referenced documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 683-14, Heat-treatable steels, alloy steels and free-cutting steels — Part 14: Hot-rolled steels for quenched and tempered springs
ISO 3887, Steels — Determination of depth of decarburization
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method
ISO 16249, Springs — Symbols
ISO 18265, Metallic materials — Conversion of hardness values
ISO 26909, Springs — Vocabulary
ISO 26910-1, Springs — Shot peening — Part 1: General procedures
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 26909 and Table 1 apply.
4 Symbols
For the purposes of this document, the symbols and units given in ISO 16249 and Table 1 apply.
6.3.3 Fatigue
The requirement of fatigue life should be agreed between the purchaser and the supplier. (For test methods, see A.10.)
6.4 Requirements for manufacturing
6.4.1 Hardness
Unless otherwise agreed by the purchaser and the supplier, the hardness of springs after heat treatment should be specified according to the application condition, material and dimension. The guidance values for tensile strength and hardness for quenched and tempered springs and test pieces should be according to the values given in ISO 683-14 and ISO 18265. Whenever the hardness range is specified, it should be less than 82 HBW. (For test methods, see A.5.)
6.4.2 Decarburization
No harmful decarburization is allowed on the tension side surface of the springs, and the depth of decarburization of the springs shall be minimized. The depth of decarburization of the spring surface should be agreed between the purchaser and the supplier, based on the spring application and the
nature of the spring material. (For test methods, see A.6.)
6.4.3 Shot peening
Whenever shot peening is required, the leaves should be shot peened after the heat treatment and before the assembly and coating, the process should be determined according to ISO 26910-1. The intensity and the coverage of shot peening should be agreed between the purchaser and the supplier.