Patent ID: 6990842
Filing Date: 2006-01-31
Classification: B24B,F16C,Y10T

Abstract:
1. A method for deep-rolling radii or fillets at a transition between bearing journals and an adjacent flange of a bearing point of a crankshaft with the aid of deep-rolling cylinders that are pressed into the radius or the fillet of the transition with a deep-rolling force while the crankshaft is rotated until a predetermined roll-down depth is reached, comprising initially deep-rolling the transition with a first deep-rolling cylinder, the radius of which has an osculating ratio between 1 and 0.85 referred to the radius of the transition or the fillet, where the roll-down depth to be achieved with the first deep-rolling cylinder is approximately 0.2 mm below the surface of the radius of the transition or the fillet, and subsequently rerolling the same transition with a second deep-rolling cylinder that has a smaller radius than the first deep-rolling cylinder, the roll-down depth to be additionally achieved with the second deep-rolling cylinder being approximately 0.05 mm below the deep-rolled surface of the transition in addition to the plastic deformation achieved with the first deep-rolling cylinder.