Abstract
Many automotive parts produced undergo surface treatment process such as sandblasting or shot peening. Coil spring is one of the parts that were exposed to this process. Warm shot peening process was found in previous research to generate longer fatigue life. The objective of this project is to determine the temperature of shot peening process to achieve the highest fatigue life for coil spring. The method used in this study was by testing 5 peening temperature, measuring the residual stress introduced by each shot peening process and conducting fatigue test to confirm. The result showed that shot peening at 220â°C would increase the fatigue life of the product and prolong the product life by almost five times longer compared to normal shot peening process at room temperature.It is proven that the most effective way to improve the fatigue life of coil spring is through implementation of warm shot peening process during production.
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