Patent ID: 7984537
Filing Date: 2011-07-26
Classification: B21F,B24C,Y10T

Abstract:
1. Method of shot peening a coil spring having coils with an inner diameter and an outer diameter, said coils normally being sufficiently close to one another when the spring is relaxed that an inner surface of the spring defined by the inner diameter of said coils is substantially closed off from an outer surface of the spring defined by the outer diameter of said coils, said method including the steps of pulling said spring through a treatment chamber wrapping a portion of the spring around an arcuate surface on a pulley being rotatably mounted in said treatment chamber and longitudinally moving said spring relative to said pulley whereby sequential coils of said spring are moved around said arcuate surface so that said sequential coils are separated from one another along portions of said coils disposed radially outward from said arcuate surface of said pulley to create openings between the coils thereby expose at least a portion of the inner surface to a shot peening media applied externally of said spring, directing said media to the outer surface to effect peening of the outer surface, and permitting a portion of said media to pass through said openings to thereby effect peening of at least a portion of said inner surface.