Patent ID: 9003850
Filing Date: 2015-04-14
Classification: B23P,B24C,C21D,F16F

Abstract:
1. A process of producing a plate spring or an undulating spring having a closed annular shape comprising the steps of: providing a plate spring or an undulating spring having a closed annular shape and including surface regions that are subjected to tensile stresses when the plate spring or the undulating spring is under load; shot peening a total surface of the plate spring or the undulating spring; and rollingly compressing an annular partial surface region of the shot peened total surface of the plate spring or the undulating spring such that an internal compressive stress is generated in a boundary layer of the annular partial surface region, wherein the annular partial surface region is rollingly compressed by bringing a ball or a roller into pressure contact with the plate spring or the undulating spring and by rotating the plate spring or the undulating spring around an axis relative to the ball or roller.