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For the weight reduction of suspension coil springs for automobiles, high-strength steel has been developed. But, in general, strength and corrosion fatigue are contradictory. Then the technological basis is to raise durability and sag resistance, and further improvement of the corrosion fatigue strength is important. As a solution for the problem, element design which improved the performance against corrosion and optimum condition of shot peening process were studied. Thus high-strength suspension coil springs have superior corrosion fatigue strength, compared with the spring made of SAE9260 were developed. Moreover, as a new basic evaluation, corrosion fatigue test of springs with an artificial pit was worked out.

This subject focuses on the simulated shot peening analysis of the collision energy and simulated collision energy distribution on coil spring. The authors studied hit condition by changing peening angle, and checked relationship between collision energy and residual stress. There have been no report that describe an analysis on the simulated shot peening effect on helical-shaped whereas reports on flat material exist1)2). In this paper, shot size, peening angle, spring wire overlapping are considered. The effectiveness of this analysis is verified in comparison with the previous test result where light was used to check the shadow of shot shower.