NON-HEAT TREATED STEEL FORGED WORKPIECE, PRODUCTION METHOD THEREFOR AND CONNECTING ROD PARTS FOR INTERNAL COMBUSTION ENGINE OBTAINED BY USING THE SAME

PROBLEM TO BE SOLVED: To provide a method by which a non-heat treated forged workpiece provided with excellent proof stress and fatigue strength can be provided at a low cost by efficiently strengthening only a part requiring high level proof stress and fatigue strength without adding a large quanti...

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Bibliographische Detailangaben
Hauptverfasser:	EHIRA ATSUSHI, OKADA YOSHIO, ANAMI GORO, IDOJIRI HIROSHI, SHIAKU NORIYUKI
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS BEARINGS BLASTING CHEMISTRY ELEMENTS OR CRANKSHAFT MECHANISMS ENGINEERING ELEMENTS AND UNITS FERROUS OR NON-FERROUS ALLOYS FLEXIBLE SHAFTS FORGE FURNACES FORGING GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HAMMERING HEATING LIGHTING MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES,RIVETS, BOLTS OR WHEELS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL ENGINEERING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PRESSING METAL PUNCHING METAL RIVETING ROTARY BODIES OTHER THAN GEARING ELEMENTS SHAFTS THERMAL INSULATION IN GENERAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method by which a non-heat treated forged workpiece provided with excellent proof stress and fatigue strength can be provided at a low cost by efficiently strengthening only a part requiring high level proof stress and fatigue strength without adding a large quantity of V, or the like, and newly increasing a reheating line, or the like. SOLUTION: Steel is hot-forged to obtain an intermediately forged workpiece having a ferritic-pearlitic structure. The part requiring high proof stress and high fatigue strength in the intermediately forged workpiece is further subjected to forging in the temperature region of the Ar1 point or lower to 200 deg.C in a cooling stage after the hot forging.