CONCENTRIC SHOOTING TYPE SHOT PEENING APPARATUS AND COIL SPRING SHOT PEENING METHOD THEREOF An objective of the present invention is to provide a concentric shooting type shot peening apparatus capable of concentratedly shooting a shot ball to the left surface part of a coil spring, and a coil spring shot peening method thereof capable of mitigating a remaining compressive stress of the left surface part of the coil spring. To this end, according to the present invention, the concentric shooting type shot peening apparatus comprises: a fixing unit to fix a coil spring; a vessel to store a shot ball; and a plurality of shooting units receiving the shot ball from the vessel to shoot the shot ball to the left surface part of the coil spring. Each shooting unit comprises: a first roller to rotate clockwise on a first vertical shaft; a second roller including an outer circumferential surface facing the outer circumferential surface of the first roller by being spaced apart therefrom at an interval and continuously shoot the shot ball provided from the vessel together with the first roller while rotating anticlockwise on a second vertical shaft; and a driver to rotate the first and second rollers.;COPYRIGHT KIPO 2019
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