The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 31, 2006
Filed:
Jan. 26, 2004
Alfred Heimann, Aachen, DE;
Alfred Heimann, Aachen, DE;
Hegenscheidt-MFD GmbH & Co. KG, Erkelenz, DE;
Abstract
The invention pertains to a method for deep-rolling radii or fillets () at the transition between the bearing journals () and the adjacent flange () of a bearing point of a crankshaft () with the aid of deep-rolling cylinders. The deep-rolling cylinders are pressed into the radius or the fillet () of the transition with a deep-rolling force until a predetermined roll-down depth () is reached while the crankshaft () is turned. The transition is initially deep-rolled 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 (), namely with a first deep-rolling force that produces a maximum internal compressive stress () in the transition at a depth between 1 and 2 mm below the deep-rolled surface (). The same transition is subsequently rerolled with a second deep-rolling cylinder that has a smaller radius () than the first deep-rolling cylinder (), the magnitude of which is chosen such that the second deep-rolling cylinder causes a further plastic deformation () on the deep-rolled surface () of the transition in addition to the plastic deformation achieved with the first deep-rolling cylinder.