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11. 发明专利

JPH073324A PRODUCTION OF STEEL HAVING EXCELLENT FATIGUE STRENGTH 失效
公开(公告)号：JPH073324A
公开(公告)日：1995-01-06
申请号：JP14497493
申请日：1993-06-16
申请人： SUMITOMO METAL IND , NISSAN MOTOR
发明人： MURAI NOBUHIRO , TSUMURA TERUTAKA , AIHARA KENJI , WATANABE YOICHI , OGURA MASAYOSHI , UMEGAKI SHUNZO
IPC分类号： C21D1/06 , C21D6/00 , C21D9/00 , C23C8/22
摘要： PURPOSE:To provide a producing method for steel material having excellent bending fatigue strength and surface fatigue strength according to the demand of lightening of machine part items. CONSTITUTION:The steel member is carburized and thereafter, the main structure is made so as to be ferrite, pearlite, bainite or mixed structure of these structures by cooling speed at

12. 发明专利

JPH04263062A PLASMA CARBURIZING FURNACE 失效
公开(公告)号：JPH04263062A
公开(公告)日：1992-09-18
申请号：JP2478891
申请日：1991-02-19
申请人： NISSAN MOTOR
发明人： UCHIYAMA NORIKO , OGURA MASAYOSHI , FUJITA HIROBUMI
IPC分类号： C23C8/36
摘要： PURPOSE:To provide a plasma carburizing furnace, in which a high concn. carburizing part for machine structural use having high strength, excellent wear resistance and pitting resistance can be quickly menufactured at a low cost. CONSTITUTION:This plasma carburizing furnace 1 has a heating chamber 2 for executing the plasma carburization, and desides the above heating chamber 2, a quenching and cooling chamber 3 for executing the quenching treatment by oil cooling, salt bath cooling or gas cooling and a vacuum or gas cooling chamber 4 for executing vacuum cooling or gas cooling are provided to the furnace 1.

13. 发明专利

JPH04250927A MANUFACTURE OF GEAR 失效
公开(公告)号：JPH04250927A
公开(公告)日：1992-09-07
申请号：JP70091
申请日：1991-01-08
申请人： DAIDO STEEL CO LTD , NISSAN MOTOR
发明人： KIMURA TOSHIMITSU , NAMIKI KUNIO , FUSHIMI SHINJI , UCHIYAMA NORIKO , OGURA MASAYOSHI
IPC分类号： B23F17/00 , B23P15/14 , C23C8/22
摘要： PURPOSE:To improve either of the fatigue resistance of a gear, the pitching resistance and impact resistance by cutting or grinding a tooth bottom and tooth root parts, after executing a high density cementation process which precipitates a carbide at 5% or more area rate in the depth in 50mum from the surface, on the gear with the steel for mechanical structure as a raw material. CONSTITUTION:The tooth bottom and tooth root parts are cut or ground, after executing a high density cementation treatment which precipitates a carbide of 5% or more at an area rate in the depth in 50mum from the surface, on the gear with the steel for mechanical structure as the raw material. Consequently, the pitching resistance of the tooth face due to the high density cementation is increased, also, the fatigue strength and impact strength of the tooth bottom and root part are increased drastically.

14. 发明专利

JPH08174340A PART FOR MACHINE STRUCTURE HAVING EXCELLENT SURFACE FATIGUE STRENGTH AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH08174340A
公开(公告)日：1996-07-09
申请号：JP32583294
申请日：1994-12-27
申请人： NISSAN MOTOR
发明人： WATANABE YOICHI , OGURA MASAYOSHI
IPC分类号： B23P13/00 , F16C33/12 , F16H55/06
摘要： PURPOSE: To provide a low-cost part for machine structure which is constituted to being excellent in a surface fatigue strength, such as a pitching resisting strength and a flaking resisting strength, and wear resistance. CONSTITUTION: A part for machine structure having an excellent surface fatigue strength is formed of a base hardening steel for machine structure serving as a material and molded in a given part by machining, such as forging and cutting, and nitrification or carbonitriding treatment is applied. Nitrogen density in depth, at which at least maximum shearing force is generated, from a surface is 0.2-0.8wt.% or less and a total sum of carbon density and nitrogen density is 0.8-1.8wt.%. Further, a surface cured layer wherein an amount of remaining austenite on an outermost surface is 15-45% is formed.

15. 发明专利

JPH07138733A SURFACE HARDENING HEAT TREATING METHOD FOR DIE 失效
公开(公告)号：JPH07138733A
公开(公告)日：1995-05-30
申请号：JP28688193
申请日：1993-11-16
申请人： NISSAN MOTOR
发明人： HAMAZAKI KEIICHI , OGURA MASAYOSHI , WATANABE YOICHI
IPC分类号： C23C8/24 , C21D1/06 , C21D6/00 , C21D9/00 , C23C8/80
摘要： PURPOSE:To produce a die for casting and forging excellent in heat check resistance and high temp. strength by heating the surface of a die material subjected to nitriding treatment, executing cooling under specified conditions and deepening the hardened surface layer. CONSTITUTION:A die material is subjected to nitriding treatment. After that, its surface is heated, and it is cooled to the martensitic transformation starting temp. or below at a cooling rate of the critical cooling rate of the martensitic transformation to

16. 发明专利

JPH06346142A PRODUCTION OF MACHINE STRUCTURAL PARTS EXCELLENT IN BEARING FATIGUE STRENGTH 失效
公开(公告)号：JPH06346142A
公开(公告)日：1994-12-20
申请号：JP16639993
申请日：1993-06-11
申请人： DAIDO STEEL CO LTD , NISSAN MOTOR
发明人： URITA TATSUMI , NAMIKI KUNIO , WATANABE YOICHI , OGURA MASAYOSHI , UMEGAKI SHUNZO
IPC分类号： C21D6/00 , C21D8/00 , C21D9/00 , C21D9/32 , C22C38/00 , C22C38/18 , C23C8/26 , C23C8/80
摘要： PURPOSE:To produce machine structural parts excellent in bearing fatigue strength by subjecting steel having a specified compsn. to nitriding treatment and thereafter executing induction hardening. CONSTITUTION:The surface of machine parts made by steel having a compsn. contg., by weight, 0.35 to 0.60% C, = two kinds among 0.1 to 0.5% V, 0.1 to 0.5% Mo, 0.5 to 2.O% Ni, 0.005 to 0.50% Ti and 0.01 to 0.10% Nb or moreover contg. one or >= two kinds among 0.04 to 0.40% S, 0.01 to 0.06% Pb, 0.003 to 0.0O50% Ca, 0.005 to 0.10% Te and 0.01 to 0.10% Bi, and the balance Fe is subjected to nitriding treatment to form a nitriding layer having >=150mum thickness on the surface. Next, this machine parts are subjected to induction hardening, by which the machine structural parts excellent in bearing fatigue strength can be obtd.

17. 发明专利

JPH02138554A HIGHLY STRENGHTENED GEAR 失效
公开(公告)号：JPH02138554A
公开(公告)日：1990-05-28
申请号：JP29086188
申请日：1988-11-16
申请人： NISSAN MOTOR
发明人： FUSHIMI SHINJI , NAKANISHI EIZABURO , KAWABE KUNIUKE , OGURA MASAYOSHI , UCHIYAMA NORIKO
IPC分类号： C21D9/32 , C23C8/04 , C23C8/22 , C23C8/32 , F16H55/06
摘要： PURPOSE:To make a gear excellent in quality and high in strength by controlling the depth of an effective hardened layers of a root circle section and root circle corner radius section to be less than the specified percent of the effective hardened layer of a tooth surface on a pitch circle in the gear which is sintered or processed by nitride sintering. CONSTITUTION:After a raw material for a gear has been processed by normal gas sintering or nitric sintering, for example, in a state that the material is in a round bar form, tooth forging is processed so as to let it be a gear raw material when it is hot or warm while remaining heat is being utilized, then, it is immersed in a neutral salt bath which is maintained at a hardening temperature (for example, 840 deg.C) so that it is hardened in oil (for example, 80 deg.C) thereafter. In this case, the depth of an effective hardened layers of a root circle section and a root circle corner radius section is controlled to be less than eighty percent of the depth of an effective hardened layer of a tooth surface on a pitch circle by a step of changing both the depth of the layer of sintering or niride sintering of the raw material in a round bar form and a working rate at the time of tooth forging. By this constitution, a highly strengthened gear of high quality can thereby be obtained, the tooth surface of which is free of the occurrence of depression and pitching and/or spalling owing to surface fatigue.

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