APPARATUS FOR PRODUCTION OF A COIL SPRING AND ITS USE

By giving an appropriate compressive residual stress to a wire material, a compression coil spring having high durability can be provided even using an inexpensive wire material. The present invention provides a compression coil spring formed by using a steel wire material, the steel wire material c...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	SHIRAISHI, Tohru, IKAI, Kazuya, ONO, Yoshiki, ONO, Yuichiro
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL 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 GRINDING HEATING LIGHTING MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MEANS FOR DAMPING VIBRATION MECHANICAL ENGINEERING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS POLISHING PUNCHING METAL SHOCK-ABSORBERS SPRINGS THERMAL INSULATION IN GENERAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS WORKING OR PROCESSING OF METAL WIRE
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Beschreibung
Zusammenfassung:	By giving an appropriate compressive residual stress to a wire material, a compression coil spring having high durability can be provided even using an inexpensive wire material. The present invention provides a compression coil spring formed by using a steel wire material, the steel wire material consisting of C: 0.45 to 0.85 mass%, Si: 0.15 to 2.5 mass%, Mn: 0.3 to 1.0 mass%, Fe and inevitable impurities as a remainder, and a circle-equivalent diameter of 1.5 to 9.0 mm, wherein hardness of a freely selected cross-section of the wire material is 570 to 700 HV, and at an inner diameter side of the coil spring, unloaded compressive residual stress at a depth of 0.2 mm from a surface in an approximate maximal main stress direction in a case in which compressive load is loaded on the spring is 200 MPa or more, and unloaded compressive residual stress at a depth of 0.4 mm from surface is 100 MPa or more.