MANUFACTURING METHOD OF SPRING FOR SUSPENSION DEVICE AND SPRING FOR SUSPENSION DEVICE

• Main Authors: KURIMOTO KIYOSHI, TANGE AKIRA
• Format: Patent
• Language: English; Japanese
• Published: 10.11.2016
• Subjects: ALLOYS; BLASTING; CHEMISTRY; ENGINEERING ELEMENTS AND UNITS; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MEANS FOR DAMPING VIBRATION; MECHANICAL ENGINEERING; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; SHOCK-ABSORBERS; SPRINGS; THERMAL INSULATION IN GENERAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; VEHICLE SUSPENSION ARRANGEMENTS; VEHICLES IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To provide a manufacturing method of a spring for a suspension device for manufacturing the spring for the suspension device having good mechanical strength and toughness in a compact production line with high productivity, and the spring for the suspension device manufactured by the manufacturing method.SOLUTION: There is provided a manufacturing method of a spring for a suspension device including: a forming process S10 for forming a steel material containing, by mass%, C:0.10 to 0.39%, Mn:1.00 to 1.50% and B:0.0005 to 0.003% into a spring shape in a hot or cold state; and a hardening process S20 for applying hardening to the formed steel material by a medium having a heat transfer coefficient equal to or close to water, and manufacturing the spring for the suspension device without tempering the hardened steel material to 400°C or more.SELECTED DRAWING: Figure 3 【課題】良好な機械的強度と靭性とを有する懸架装置用ばねを、コンパクトな生産ラインで生産性高く製造する懸架装置用ばねの製造方法及びその製造方法により製造される懸架装置用ばねの提供。【解決手段】質量％で、Ｃ：０．１０〜０．３９％、Ｍｎ：１．００〜１．５０％、Ｂ：０．０００５〜０．００３％を含む鋼材を熱間又は冷間においてばね形状に成形する成形工程Ｓ１０と、成形された前記鋼材に水と同等以上又は水に近い熱伝達率を有する媒体による焼入れを施す焼入れ工程Ｓ２０とを含み、焼入れが施された前記鋼材を４００℃以上に焼戻すこと無く懸架装置用ばねを製造する懸架装置用ばねの製造方法。【選択図】図３