METHOD AND DEVICE FOR HEAT TREATMENT OF STEEL

PROBLEM TO BE SOLVED: To easily set the direction of residual compressive stress given to steel to be the same as that of the stress exerted in the steel, and to improve the dimensional accuracy by suppressing the distortion. SOLUTION: The steel is twisted in a range in which no plastic deformation...

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Bibliographische Detailangaben
Hauptverfasser:	NISHIO MASAHIRO, AKIYAMA MITSUTOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS ENGINEERING ELEMENTS AND UNITS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS 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 SHOCK-ABSORBERS SPRINGS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To easily set the direction of residual compressive stress given to steel to be the same as that of the stress exerted in the steel, and to improve the dimensional accuracy by suppressing the distortion. SOLUTION: The steel is twisted in a range in which no plastic deformation is generated, a part with the tensile stress exerted in the state is heat-treated, and untwisted after the cooling. The total of the difference of the residual tensile stress subtracted from the tensile stress exerted in the heat-treated part, and the stress added by the stress generated when a non-treated part is restored to an original shape by elasticity is remained as the compressive stress. The residual compressive stress in the steel is balanced by this treatment in the forward and reverse directions.