METHOD FOR PRODUCING COLD-FORMED STEEL SPRINGS
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United States of America Patent
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Oct 5, 2017
app pub date -
Jul 15, 2015
filing date -
Sep 4, 2014
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Abstract
A process for producing a spring and/or torsion bar from a steel wire by cold forming may involve providing a steel wire; thermomechanically forming the steel wire above a minimum recrystallization temperature of the steel wire; cooling the steel wire; tempering the steel wire, which may involve heating, quenching, reheating, and cooling the steel wire; cold forming the steel wire at a cold forming temperature, the cold forming temperature being a temperature below the minimum recrystallization temperature of the steel wire; and separating the steel wire. With respect to the cooling of the steel wire, the steel wire may be cooled to a temperature below the minimum recrystallization temperature such that at least a partly ferritic-pearlitic structure is formed in the steel wire.
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