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:
Sep. 18, 1979
Filed:
Jun. 12, 1978
Applicant:
Inventor:
Dale L Taipale, Libertyville, IL (US);
Assignee:
Outboard Marine Corporation, Waukegan, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C21D / ;
U.S. Cl.
CPC ...
72 53 ;
Abstract
Disclosed herein is a process of compression stressing a metal workpiece having a body with a central bore so as to produce a residual compressive stress in the workpiece to increase the fatigue strength of the workpiece. The process includes the steps of forcing the workpiece onto a mandrel to induce an initial tensile stress in the body, thereafter inducing a compressive stress in the surface of the workpiece by shot blast treatment of the surface of the workpiece, and thereafter separating the workpiece from the mandrel to increase the compressive stress in the surface of the workpiece.