Abstract: An apparatus for stress shot peening of a coil spring is disclosed. The apparatus of the present invention is constructed such that coil springs, which are compressed and clamped by corresponding spring clamping units (20) facing each other, are rotated on their own axes and are simultaneously supplied into the shot room (10) for shot peening. Therefore, the present invention can markedly enhance the internal stress of the coil spring, compared to a coil spring treated by the conventional shot peening apparatus. Furthermore, in the present invention, because the coil springs are clamped by the corresponding spring clamping units facing each other and are simultaneously rotated and moved into the shot room for shot peening, various kinds of side load coil springs, as well as a typical cylindrical coil spring, can be evenly treated throughout the entire surface thereof by shot peening.

Abstract: An apparatus for stress shot peening of a coil spring is disclosed. The apparatus of the present invention is constructed such that coil springs, which are compressed and clamped by corresponding spring clamping units (20) facing each other, are rotated on their own axes and are simultaneously supplied into the shot room (10) for shot peening. Therefore, the present invention can markedly enhance the internal stress of the coil spring, compared to a coil spring treated by the conventional shot peening apparatus. Furthermore, in the present invention, because the coil springs are clamped by the corresponding spring clamping units facing each other and are simultaneously rotated and moved into the shot room for shot peening, various kinds of side load coil springs, as well as a typical cylindrical coil spring, can be evenly treated throughout the entire surface thereof by shot peening.