Modern state and directions of perfection of technological processes of manufacturing hardened-tempered spring wire

Abstract

Hardened-tempered spring wire has a great demand in domestic automobile industry. A considerable part of such a wire is imported. In view of increase of demand in treated wire for springs of critical application and measures implementation for import substitution, perfection of technological processes of its production becomes actual. Basic technical requirements to spring wire as per domestic and foreign standards presented, the factors effecting the quality of finished products considered. Description of technological processes of hardened-tempered spring wire of critical application presented. It was shown that domestic technological scheme of treated wire production is analogous to foreign one, however to reach the quality of products, correspondent to norms нормам EN 10270-2:2012, a perfection of it is needed. Proposals to improve the technology of manufacturing domestic competitive products elaborated. Among them a necessity to use steels of Si‒Cr or Si‒Cr‒V system, additionally alloyed by manganese, cobalt, tungsten a(or) other elements highlighted. It was proposed to implement an operation of scalping instead of turning and a system of nondestructive control, to use resource-saving routes of wire drawing with high uniformity of properties, to replace hardening and tempering by thermomechanical treatment (for some kinds of wire), to use modern highly-productive equipment.