TITANIUM SYSTEM METAL FORGING METHOD, ENGINE VALVE MANUFACTURING METHOD AND ENGINE VALVE

PROBLEM TO BE SOLVED: To provide a forging method of titanium system metal, with which a high ductility and high fatigue strength titanium system metallic product can be manufactured at low cost, and a manufacturing method of an engine valve. SOLUTION: This titanium system metal forging method has a...

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Hauptverfasser:	YAMAGUCHI TOSHIYA, FURUTA TADAHIKO, IWASE SATORU, SHIBATA YOSHINORI, KITAMURA TATSUYA, HOTTA AKIO, HARUTA TAKASHI, SAITO TAKU
Format:	Patent
Sprache:	eng
Schlagworte:	ACTUATING-FLOATS ALLOYS BLASTING CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS CHEMISTRY COCKS CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES DEVICES FOR VENTING OR AERATING ENGINE PLANTS IN GENERAL ENGINEERING ELEMENTS AND UNITS FERROUS OR NON-FERROUS ALLOYS FORGE FURNACES FORGING GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HAMMERING HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES,RIVETS, BOLTS OR WHEELS MECHANICAL ENGINEERING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY PERFORMING OPERATIONS PRESSING METAL PUNCHING METAL RIVETING STEAM ENGINES TAPS THERMAL INSULATION IN GENERAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS VALVES WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a forging method of titanium system metal, with which a high ductility and high fatigue strength titanium system metallic product can be manufactured at low cost, and a manufacturing method of an engine valve. SOLUTION: This titanium system metal forging method has a process to prepare a thermodynamically stable ceramics in a titamic alloy and/or a titanium system sintered material, containing pores at volume ratio of 1% or more in total, and a process to forge the material by heating it to a forging temperature. Since inside pores or thermodynamically stable ceramics grains in the titamic alloy restrains, under this method, growth of a crystal grain at the time of forging, forging at a relatively high temperature condition becomes possible under which material deformation resistance is low. Also, as it becomes possible for maintaining a minute alloy setup, lowering of impact value and fatigue strength can be restrained.