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1. 发明专利

JP2000135543A TITANIUM SYSTEM METAL FORGING METHOD, ENGINE VALVE MANUFACTURING METHOD AND ENGINE VALVE 失效
公开(公告)号：JP2000135543A
公开(公告)日：2000-05-16
申请号：JP30923498
申请日：1998-10-29
申请人： TOYOTA MOTOR CORP , TOYOTA CENTRAL RES & DEV , AISAN IND
发明人： YAMAGUCHI TOSHIYA , HOTTA AKIO , SHIBATA YOSHINORI , FURUTA TADAHIKO , SAITO TAKU , IWASE SATORU , HARUTA TAKASHI , KITAMURA TATSUYA
IPC分类号： B21K1/22 , B21J5/00 , C22C14/00 , C22F1/00 , C22F1/18 , F01L3/02 , F01L3/24 , F16K24/00
摘要： 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.

2. 发明专利

JP2000129313A PRODUCTION OF SINTERED ALLOY MEMBER 失效
公开(公告)号：JP2000129313A
公开(公告)日：2000-05-09
申请号：JP30735098
申请日：1998-10-28
申请人： TOYOTA MOTOR CORP , AISAN IND
发明人： SHIBATA YOSHINORI , YAMAGUCHI TOSHIYA , HOTTA AKIO , IWASE SATORU , HARUTA TAKASHI , KITAMURA TATSUYA
IPC分类号： B21J5/08 , B22F3/24
摘要： PROBLEM TO BE SOLVED: To prevent cracking in an alloy member even in the case the temp. of a die is the relatively low one by removing an embrittled layer generated extremely on the surface of a sintered body caused by the evaporation of titanium from the surface by heat at the time of sintering a titanium alloy and thereafter subjecting this sintered body to extrusion molding or forging. SOLUTION: Ti alloy powder 10 obtd. by mixing titanium hydride with Al-Sn- Zr alloy powder is prepd. and is pressurized by a die to mold a molded body 20, which is sintered to make a sintered body 30. For removing an embrittled layer generated by a Ti evaporating phenomenon caused by heat at the time of the sintering of the surface of the sintered body 30, polishing to a depth of >=5 μm is executed, and, jointly, the surface roughness of the sintered body 30 is controlled to >=3 μmRz. The sintered body 30 is coated with a lubricant, which is set to a die 50 and is subjected to extrusion molding to mold a cylindrical sintered body 41 to form into a pattern of an engine valve 40. The die 50 executes high frequency induction heating or the like for preventing the drop of the temp. by heat transfer and the drop of the temp. of the sintered body 30. The lubricant in the cylindrical sintered body 41 is removed, which is set to a die 60, a punch 61 is lowered, and forging is executed.

3. 发明专利

JP2001131605A METHOD FOR MANUFACTURING GREEN COMPACT, SINTERED- TITANIUM VALVE LIFTER AND ITS SURFACE-TREATING METHOD 失效
公开(公告)号：JP2001131605A
公开(公告)日：2001-05-15
申请号：JP31684599
申请日：1999-11-08
申请人： TOYOTA CENTRAL RES & DEV , AISAN IND
发明人： TAKAMIYA HIROYUKI , FURUTA TADAHIKO , FAN JONHAN , KATO KOJI , SAKURAI KOJI , HARUTA TAKASHI
IPC分类号： F01L1/14 , B22F3/02 , B22F5/00 , C23C8/10
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a green compact by which the cracking of the compact or the like is prevented or reduced. SOLUTION: A rubber die packed with a raw powder is uniaxially pressed in a mold to manufacture a green compact of the raw powder. In this case, a part of the outer surface of the compact almost orthogonal to the pressing direction is formed by a high-rigidity die member provided to the die.

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