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:
Jun. 23, 2020
Filed:
Jul. 15, 2015
Thyssenkrupp Federn Und Stabilisatoren Gmbh, Hagen, DE;
Thyssenkrupp Ag, Essen, DE;
Dieter Lechner, Düsseldorf, DE;
Marcel Groß, Dortmund, DE;
Heinz-Georg Gabor, Wetter, DE;
Marco Roland, Dortmund, DE;
Dieter Brier, Werdohl, DE;
THYSSENKRUPP FEDERN UND STABILISATOREN GMBH, Hagen, DE;
THYSSENKRUPP AG, Essen, DE;
Abstract
A process for producing a spring or torsion bar from a steel wire by hot forming may involve providing a steel wire; thermomechanically forming the steel wire; cooling the steel wire thermomechanically; cutting the steel wire to length to give rods; heating the rods; hot forming the rods; and tempering the rods to give a spring or torsion bar, comprising quenching the rods to give a spring or torsion bar to a first cooling temperature, reheating the spring or torsion bar to a first annealing temperature, and cooling the spring or rod to a second cooling temperature. Further, in some examples, the cooling of the steel wire may be cooled to a temperature below a minimum recrystallization temperature such that at least a partly ferritic-pearlitic structure is established in the steel wire.