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US 9,003,850 B2Granted
Boundary layer improvement of plate springs or undulating springs
AssigneeMuhr und Bender KG
InventorsBernfried Hesselmann, Sven Roth, Peter Buchner, Andreas Rinsdorf, Thomas Muhr
Life of this patent
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Abstract
A process for producing plate springs or undulating springs wherein surface regions which are subjected to tensile stresses when the spring is under load are provided with an internal compressive stress in the boundary layer, wherein said surface regions are rollingly compressed by a ball or roller or subjected to tensile stress and compressed by shot peening.
Claims7
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.
1 more element
Dependencies are inferred from the claim text.