Metal deforming – By use of roller or roller-like tool-element – Comprising tool movable relative to stationary work-portion...
Patent
1986-10-31
1989-04-11
Spruill, Robert L.
Metal deforming
By use of roller or roller-like tool-element
Comprising tool movable relative to stationary work-portion...
291211, 29130, 29132, 72208, B21B 1702, B21B 2102
Patent
active
048194719
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.
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Katz Steven B.
Spruill Robert L.
Westinghouse Electric Corp.
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