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Title: Manufacturing Method of Suspension Spring for Car
Author: Takezawa; Ichiki; Tadakuma; Tanae; Akiyama
Source: US Patent 6,346,157
Publication year 2002
Document number: 2002078
Number of pages: 12
Abstract:
A method for manufacturing a coiled spring having a high fatigue strength to be used for example as a suspension spring of a car using a rod of tensile strength 1910 to 2020
N/mm2 and diameter 8 to 17 mm. In a cold coiling step, the rod is formed into a coil. Annealing is then carried out to remove strains having arisen inside the coil during
the coiling step. A hot setting step of utilizing surplus heat from the annealing step and applying a predetermined load to the coil to compress it for a predetermined time
is then carried out. After that, multi-stage shot peening is carried out on the coil.
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This page last revised: 04/24/2008