PRODUCTION METHOD OF CRANK SHAFT

PROBLEM TO BE SOLVED: To produce a highly-strong crank shaft by preventing generation of a crack in the crank shaft, when performing a bend correction step.SOLUTION: A production method of a crank shaft 1 comprising a steel stock includes steps for: forming a nitrogen compound layer 5 on the surface...

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Bibliographische Detailangaben
Hauptverfasser:	YAMADA AKINORI, ETO HIROHITO
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	BEARINGS BLASTING CHEMICAL SURFACE TREATMENT CHEMISTRY 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 ELEMENTS OR CRANKSHAFT MECHANISMS ENGINEERING ELEMENTS AND UNITS FLEXIBLE SHAFTS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIGHTING MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL ENGINEERING METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS ROTARY BODIES OTHER THAN GEARING ELEMENTS SHAFTS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To produce a highly-strong crank shaft by preventing generation of a crack in the crank shaft, when performing a bend correction step.SOLUTION: A production method of a crank shaft 1 comprising a steel stock includes steps for: forming a nitrogen compound layer 5 on the surface of the crank shaft 1 by performing a soft nitriding treatment to the crank shaft 1; and correcting a bend generated on the crank shaft 1 by the soft nitriding treatment, in which the nitrogen compound layer 5 comprises a γ(FeN) phase.SELECTED DRAWING: Figure 2 【課題】曲がり直し工程を行う時にクランクシャフトに亀裂が発生するのを防止することにより、強度の高いクランクシャフトの製造を可能にする。【解決手段】鋼材からなるクランクシャフト１の製造方法であって、クランクシャフト１に軟窒化処理を行うことにより、クランクシャフト１の表面に窒素化合物層５を形成する工程と、軟窒化処理によってクランクシャフト１に生じた曲がりを矯正する工程と、を含み、窒素化合物層５が、γ´（Ｆｅ4Ｎ）相からなることを特徴とする。【選択図】図２