专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

21. 发明专利

JP2001011578A GEAR EXCELLENT IN CONTACT FATIGUE LIFE STRENGTH 失效
公开(公告)号：JP2001011578A
公开(公告)日：2001-01-16
申请号：JP18195399
申请日：1999-06-28
申请人： NIPPON STEEL CORP , TOYOTA MOTOR CORP
发明人： TODA MASAHIRO , KANISAWA HIDEO , ITO SEIJI , YASUDA SHIGERU , SHINOHARA AKIHIKO , KONDO MASAAKI
IPC分类号： B24C1/10 , C21D1/06 , C21D7/06 , C22C38/00 , C22C38/18 , C22C38/44 , F16H55/06
摘要： PROBLEM TO BE SOLVED: To obtain excellent pitting fatigue strength, in steel having a specified compsn., by controlling the thickness of an imperfect quenched layer, the compressive residual stress on the surface, the value β' obtd. by making the X-ray diffraction half-value width dimensionless by the half-value width after the annealing of the steel, the relation between the β' and the surface roughness and the ratio of the residual austenite by surface hardening treatment. SOLUTION: This gear excellent in contact fatigue life strength contains, by weight, 0.1 to 0.3% C, 0.01 to 0.5% Si, 0.3 to 1.5% Mn and 0.3 to 1.5% Cr, and the balance Fe with inevitable impurities, in which, by surface hardening treatment of imparting working distortion to the surface after carburizing, annealing and tempering, the thickness of the imperfect quenched layer is controlled to >=8 μm, the compressive residual stress in the surface to >=25 kgf/mm2, the value β' obtd. by making the X-ray diffraction half-value width dimensionless by the half-value width after the annealing of the steel to >=1.65, the relation between the β' and the surface roughness Rmax (unit μm) to satisfy β'

22. 发明专利

JP2003138315A INDUCTION HEATER FOR STEEL 审中-公开
公开(公告)号：JP2003138315A
公开(公告)日：2003-05-14
申请号：JP2001331868
申请日：2001-10-30
申请人： NIPPON STEEL CORP , TOYOTA MOTOR CORP , AICHI STEEL WORKS LTD
发明人： NAKAMURA MITSURU , KADA OSAMU , TODA MASAHIRO , MORISHITA KOICHI , SEGAWA HARUHIKO , MORI MOTOHIDE , SEGAWA KOHEI , HIROSE YASUO , IWAKI SHOJI
IPC分类号： H05B6/10 , C21D1/00 , C21D1/42
摘要： PROBLEM TO BE SOLVED: To provide an induction heater which can reliably raise the temperature of a center part of a steel member to the temperature immediately below the liquidus, maintain a surface layer part in a non-molten condition, and feed the steel member to the next hot working in a most favorable condition. SOLUTION: In this induction heater to pass the steel member through an induction heating coil in the heater and heat the steel member, a cooling device 4 to allow a cooling medium to flow into a space between the heater body and the steel member 3 is disposed on an end part of the heater body. Preferably, a steel member surface temperature detecting means is provided on the outlet side of the heater body, and a means to control the heating quantity, the cooling medium quantity and the moving speed in a single or combined manner based on the detected temperature is provided.

23. 发明专利

JP2001107183A HIGH STRENGTH GEAR 失效
公开(公告)号：JP2001107183A
公开(公告)日：2001-04-17
申请号：JP28413999
申请日：1999-10-05
申请人： TOYOTA MOTOR CORP , NIPPON STEEL CORP
发明人： SHINOHARA AKIHIKO , NAKANO OSAMU , ERIGUCHI TADASHI , ITO SEIJI , KANISAWA HIDEO , TODA MASAHIRO
IPC分类号： F16H55/06 , C21D9/32 , C22C38/00 , C22C38/22 , C22C38/26 , C23C8/34
摘要： PROBLEM TO BE SOLVED: To improve the pitching resistance of the tooth surface and the bending fatigue resistance of a dedendum without executing shot peening and grinding the tooth surface. SOLUTION: This gear is obtained by subjecting a gear formed body obtained from steel to carbonitriding treatment and thereafter executing quenching treatment, in which the concentration of carbon from the surface to a depth of 50 μm is 0.5 to 1.0 wt.%, the concentration of nitrogen is 0.1 to 0.3 wt.%, and also, the amount of retained austenite from the surface to the depth of 50 μm is

24. 发明专利

JP2001040452A GEAR SUPERIOR IN FATIGUE LIFE STRENGTH IN CONTACT 失效
公开(公告)号：JP2001040452A
公开(公告)日：2001-02-13
申请号：JP21063499
申请日：1999-07-26
申请人： NIPPON STEEL CORP , TOYOTA MOTOR CORP
发明人： TODA MASAHIRO , ITO SEIJI , KANISAWA HIDEO
IPC分类号： F16H55/17 , C22C38/00 , C22C38/18 , C22C38/50
摘要： PROBLEM TO BE SOLVED: To find a simple and effective measure for improving pitting fatigue life of a gear so that the gear withstands increased bearing pressure by load as a result of miniaturization, weight reduction and power increase of automobile parts especially for a gear ground after heat treatment for noise reduction. SOLUTION: A material of the gear consists of, in weight %, 0.1-0.3% C, 0.3-1.5% Mn, 0.01-0.06% S, 0.3-1.5% Cr, and the balance Fe with inevitable impurities. Also the material has the maximum ratio (L/D) of a length of a long diameter L of MnS to that of a short diameter D being not more than 7, or the maximum length being not more than 12 μm, and no oxidation layer of grain boundary on the gear surface.

25. 发明专利

JP2002192286A MANUFACTURING METHOD OF BOTTOMED HOLLOW PARTS HAVING DEEP HOLE 失效
公开(公告)号：JP2002192286A
公开(公告)日：2002-07-10
申请号：JP2001121393
申请日：2001-04-19
申请人： NIPPON STEEL CORP
发明人： KADA OSAMU , TODA MASAHIRO
IPC分类号： B21D22/28 , B21D51/16 , B21J5/06 , B21K21/06
摘要： PROBLEM TO BE SOLVED: To provide a low-cost manufacturing method of bottomed hollow parts having a deep hole in which the ratio L/d of a hole depth L to the inside diameter d is 10 or more. SOLUTION: When inserting a mandrel having a diameter thinner than an inside diameter into an inside diameter part made up of a rough shape material which is manufactured by extrusion and carrying out cold ironing process, either bigger one of ln((D02-d02)/(D2-d2)) and ln(D02/D2) is less than 6,000×(DM/ LM)2/Ts, where the tensile strength of the raw material is Ts, the outside diameter of a hollow part before ironing is D0, the inside diameter of a hollow part before ironing is d0, the outside diameter of a hollow part after ironing is D, the inside diameter of a hollow part after ironing is d, a mandrel diameter is DM and an mandrel length is LM. When a contraction of area in a rough shape material is ϕ[%], in addition, cold ironing process is conducted at a plurality of steps so that ln((D02-d02)/(D2-d2)) becomes less than 0.025×ϕ-1.2.

26. 发明专利

JP2002121644A GEAR HAVING EXCELLENT DEDENDUM FATIGUE LIFE AND CONTACT FATIGUE LIFE 失效
公开(公告)号：JP2002121644A
公开(公告)日：2002-04-26
申请号：JP2000315018
申请日：2000-10-16
申请人： NIPPON STEEL CORP
发明人： TODA MASAHIRO , ITO SEIJI , KANISAWA HIDEO
IPC分类号： F16H55/17 , C21D7/06 , C22C38/00 , C22C38/18 , C22C38/60
摘要： PROBLEM TO BE SOLVED: To provide a gear which is to be subjected to high loaded specific pressure in response to the recent demand for the miniaturization, weight reduction, and applied force increase of automotive parts and has improved pitting fatigue life. SOLUTION: In the gear having excellent dedendum fatigue life and contact fatigue life: compressive residual stress at the surface is >=400 MPa; a slack quenched layer is 5-15 μm thick; surface roughness Rmax is

27. 发明专利

JPH0925540A STEEL CONTAINING UNIFORMLY DISPERSED FINE GRAPHITE, EXCELLENT IN MACHINABILITY AND HARDENABILITY, AND ITS PRODUCTION 失效
公开(公告)号：JPH0925540A
公开(公告)日：1997-01-28
申请号：JP17617895
申请日：1995-07-12
申请人： NIPPON STEEL CORP
发明人： KATAYAMA AKIRA , TODA MASAHIRO , TARUI TOSHIZO
IPC分类号： C21D8/00 , C21D1/32 , C21D6/00 , C22C38/00 , C22C38/06 , C22C38/12
摘要： PROBLEM TO BE SOLVED: To produce a steel containing uniformly dispersed fine graphite, excellent in machinability and hardenability, used after being subjected to cold rolling (forging/machining) and then to quench-and-temper treatment and applicable to automobile parts and industrial machinery members. SOLUTION: This steel has a composition consisting of, by weight, 0.20-0.90% C, 0.5-1.5% Si, 0.3-1.0% Mn, =2 kinds among 0.02-0.20% W, 0.02-0.20% Ta, and 0.02-0.20% Nb, and the balance Fe with inevitable impurities. Further, this steel has graphite of =1000pieces/mm number of grains by 0.2-0.90%. By this method, the steel containing uniformly dispersed fine graphite, excellent in machinability and hardenability, can be obtained.

28. 发明专利

JPH08283847A PRODUCTION OF GRAPHITE STEEL FOR COLD FORGING EXCELLENT IN TOUGHNESS 失效
公开(公告)号：JPH08283847A
公开(公告)日：1996-10-29
申请号：JP8686595
申请日：1995-04-12
申请人： NIPPON STEEL CORP
发明人： TODA MASAHIRO , KADA OSAMU , MIKI TAKESHI
IPC分类号： B21C1/00 , C21D8/06 , C22C38/00 , C22C38/06
摘要： PURPOSE: To produce a graphite bar steel for cold forging excellent in toughness by subjecting a bar steel having a specified componental compsn. and immediately after hot rolling to cooling treatment, graphitizing treatment and wire drawing in succession under specified conditions. CONSTITUTION: A bar steel having a compsn. contg., as basic components, by weight, 0.3 to 1.0% C, 0.3 to 1.3% Si, 0.4 to 1.0% Mn, =30% reduction rate of area. Thus, the graphite steel for cold forging used after hardeing and tempering after cold forging and excellent in toughness can be obtd.

29. 发明专利

JPH081268A FORGING TOOL HAVING GRADED FUNCTION AND ITS PRODUCTION 失效
公开(公告)号：JPH081268A
公开(公告)日：1996-01-09
申请号：JP16075094
申请日：1994-06-21
申请人： NIPPON STEEL CORP
发明人： MIKI TAKESHI , TODA MASAHIRO , KADA OSAMU , KITAGUCHI SABURO
IPC分类号： B21J13/02 , C23C4/04 , C23C4/10 , C23C4/12
摘要： PURPOSE:To provide the above tool having the high strength to withstand repetitive use by consisting of its inside of steel or cast iron and specifically and continuously changing the weight mixing ratios of ceramics to the material components in its inside and extreme surface between the specific parts of surface layer parts which come into contact with a work piece. CONSTITUTION:The tool steel having both of strength and toughness is preferably used as the internal material of dies and the cast iron is equally usable for the dies with which the load is lower. The dies 2, 4 and the punch 5 are formed to the mixed state of the ceramics from 0.5 to 3mm in their surface layer parts. The range of the depth is determined from the lower limit at which an effect of heat insulation is exhibited and the upper limit at which the strength and toughness are assured. The mixing ratios of the ceramics are continuously changed in such a manner that the range of 0.6 to 1.0 by weight is attained at the extreme surface. The kinds of the ceramics are ZrO2, SiC, Al2O3, etc., having a heat insulating effect and strength. As a result, intricate die forging is made possible and stages are shortened.

30. 发明专利

JPH0775846A PRODUCTION OF HIGH STRENGTH BOLT EXCELLENT IN DELAYED FRACTURE RESISTANCE 失效
公开(公告)号：JPH0775846A
公开(公告)日：1995-03-20
申请号：JP22256293
申请日：1993-09-07
申请人： NIPPON STEEL CORP
发明人： TODA MASAHIRO , ISHIKAWA FUSAO , KANISAWA HIDEO
IPC分类号： B21J5/00 , B21K1/46 , C21D1/25 , C21D1/26 , C22C38/00 , C22C38/28
摘要： PURPOSE:To provide the production method of a high strength bolt excellent in delayed fracture resistance by using the steel of specified component and adjusting harm forging after annealing and tempering temp. CONSTITUTION:After the steel, in which C, Si, Mn, P, S, Cr, Mo, Al, V, Ti, Nb, N are specified, is subjected to supheroidizing, it is subjected to bolt forming with heating to 200-400 deg.C and at a working speed of >=200mm/sec, at executing subsequent quenching-tempering, the tempering temp. is >=400C. Further, in the case of forging with heating to >=400 deg.C, the punch having a surface temp. of =250 deg.C, it is subjected to bolt forming at a working speed of average >=200mm/ sec, the tempering temp. at subsequent quenching.tempering is >=400 deg.C.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式