Method of making an embossed metal gasket
AssigneeFederal-Mogul World Wide, Inc.
InventorThomas Zurfluh
Life of this patent
Estimating the term…
Abstract
A metal gasket formed from a suitable iron-nickel chromium alloy includes at least one embossment that exhibits essentially full functional recovery at temperatures exceeding 1000° F. and including in the range of 1100° F. to 1600° F. or more and which is made from sheet material that is work hardened and strengthened by cold rolling, or a combination of cold rolling and precipitation hardening, without any post embossment heat treating that would act to further harden the material. Suitable iron-nickel-chromium alloys include those comprising, by weight, greater than 18% nickel; greater than 14% chrome and 0.1-10% of at least one element selected from the group consisting of Mo, Ti, V, Al, Co, Nb, Ta and Cu, with the balance being substantially Fe, wherein the gasket sheet alloy has a deformed microstructure.
Claims9
A method of making an embossed metal gasket, comprising the steps of:
- forming an annealed sheet of an iron-nickel-chromium alloy;
- cold rolling the annealed sheet without shaping to produce a cold-rolled, work hardened microstructure of the sheet;
- and
- forming a gasket from said sheet including cold forming a least one embossed sealing bead which imparts further work hardening in the area of the at least one sealing bead wherein the at least one sealing bead is sealably operable with substantially full functional recovery in a fully-clamped, sealed joint at a temperature of greater than 1100° F. and up to 1200° F. without post-embossment heat treating of the sealing bead to provide the finished sealing bead with at least a portion of the work hardened microstructure as cold-rolled and embossed.
Dependencies are inferred from the claim text.