Abstract
Generally, we have very great difficulties to measure residual stress and to investigate the shot-peened effects after shot peening on the inner surface of small bore size bellows made of SUS304 steel. However we obtained a greater compressive residual stress on the inner surface of the bellows using a reflection shot peening method and found the peened effects. In addition we found that this method in comparison with non-shot peening one brought fairly improved fatigue strength. But it is difficult to measure residual stress of SUS304 steel. And then this experimental conditions are decided by measuring residual stress of SUS631 steel bellows which has an identical shape and dimensions of SUS304 steel bellows. We established the best shot peening conditions from the relations among pressure, glass beads size and fatigue strength obtained by the aboved conditions. So it is confirmed by the experiments that the reflection shot peening method is successful for small bore size bellows made of SUS304 steel.
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