METHOD FOR MANUFACTURING SPRING STEEL WIRE, AND MANUFACTURING APPARATUS THEREFOR

• Main Authors: IKEMORI YOSHIFUMI, MIZOGUCHI SHIGERU, FUJIMOTO TAKASHI, OKAMURA TSUKASA, UEMOTO TOSHIFUMI, MACHIDA KIYOAKI
• Format: Patent
• Language: English
• Published: 25.12.2008
• Subjects: ALLOYS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide an apparatus for manufacturing a spring steel wire which makes an oxidized film that has once been formed thereon seldom exfoliated. SOLUTION: This manufacturing method includes: a first heating step of heating a wire rod 1 with the use of a first heating coil 31; and a second heating step of heating the wire rod 1 heated in the first heating step, at a higher temperature than that in the first heating step with the use of a second heating coil 32. A gas supply device 8 charges water vapor and carbon dioxide almost at the same time onto the wire rod 1 which passes on the inline between the second heating coil 32 and a cooling device 4. Thus oxidized film seldom exfoliates from a base material of the wire rod. COPYRIGHT: (C)2009,JPO&INPIT