US Patent 7866198 Method of producing a stepped shaft

Patent 7866198 was granted and assigned to American Axle on January, 2011 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

American Axle

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7866198

Date of Patent

January 11, 2011

Patent Application Number

12055389

Date Filed

March 26, 2008

Patent Primary Examiner

‌

Edward Tolan

Patent abstract

A method for forming a stepped shaft includes: forming a billet of a predetermined mass; heating the billet; cross-wedge rolling the billet to form an intermediate workpiece having a first cylindrical portion and a second cylindrical portion that are axially spaced apart by a neck that is smaller in diameter than the first and second cylindrical portions; and performing at least one upset forging operation on the end of the intermediate workpiece to enlarge the first cylindrical portion such that in at least one location its diameter is larger than a diameter of any other portion of the stepped shaft and larger than a diameter of the billet.