A method for manufacturing cold-formed steel springs

摘要

A method for manufacturing cold-formed steel springs, in particular coil springs (3 ’) or torsion bar springs made of steel, comprising the steps of:1) Providing (10) of a wire (1), which in the case of a working temperature (t₁) above the austenitizing temperature (ac₃) of the wire material of a thermomechanical forming (12) has been subjected to,2) A heat treatment of the wire (1), comprisinga) a heating (17) of the wire (1) to a tempering temperature (t₂) above the austenitizing temperature of the wire material and austenitization,b) a quenching (18) of the tempering temperature (t₂) heated wire (1) for the formation of a martensitic structure in the wire (1),c) a tempering of the wire (1),3) Cold forming of the wire (1) for the generation of the cold-formed steel spring (3 ’), wherein said wire (1) according to the thermomechanical forming (12) to a temperature below 200°C. (13) is cooled in such a manner that, in the cooled wire (1) a pearlitic - ferritic structure is established (14).