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:
Apr. 11, 1989
Filed:
Oct. 31, 1986
Charles S Cook, Murrysville Boro, PA (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
A pilgering die for use in cold forming of tubular members is in the shape of a ring member having a groove in the outer periphery thereof and a bore therethrough, the die composed of at least two different alloy sections. The case or outer region of the die is formed from a first steel alloy which hardens by transforming to martensite under predetermined heat treating conditions while the core or inner region of the die is formed from a second steel alloy that does not transform to martensite under the heat treating conditions used to harden the case. A third alloy section of a material which hardens by martensite formation may be provided adjacent the bore through the die. Also, the second alloy section may be comprised of a steel alloy that has a higher thermal expansion rate than the thermal expansion rate of the first alloy section.