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41. 发明专利

JP2010225673A MIXED POWDER FOR DUST CORE, AND METHOD OF MANUFACTURING DUST CORE USING MIXED THE POWDER 有权
公开(公告)号：JP2010225673A
公开(公告)日：2010-10-07
申请号：JP2009068820
申请日：2009-03-19
申请人： KOBE STEEL LTD
发明人： MITANI HIROYUKI , HOJO TAKAFUMI , AKAGI NOBUAKI
IPC分类号： H01F1/24 , B22F1/00 , B22F1/02 , B22F3/24 , H01F27/255 , H01F41/02
摘要： PROBLEM TO BE SOLVED: To provide powder for a dust core for manufacturing the dust core with a low iron loss (eddy current loss and hysteresis loss) and high magnetic flux density. SOLUTION: Iron-based powder A where an insulating inorganic coat (a) and a heat-resistant resin coat (b) are formed in this order on a surface is mixed with iron-based powder B where an insulating inorganic coat (c) is formed on a surface. The ratio of mixture between the iron-based powder A and iron-based powder B is preferred to satisfy the following equation (1). The equation (1) is 0% COPYRIGHT: (C)2011,JPO&INPIT

42. 发明专利

JP2000144208A COMPRESSION MOLDING METHOD OF POWDER FOR POWDER METALLURGY 失效
公开(公告)号：JP2000144208A
公开(公告)日：2000-05-26
申请号：JP31503098
申请日：1998-11-05
申请人： KOBE STEEL LTD
发明人： TSUCHIDA TAKEHIRO , KAKO HIROSHI , SEKI YOSHIKAZU , SATO MASAAKI , AKAGI NOBUAKI , SAWAYAMA TETSUYA
IPC分类号： B22F3/02 , B22F3/035 , B22F3/093
摘要： PROBLEM TO BE SOLVED: To provide a method which is capable of efficiently increasing the density of a formed body, and further improving the mechanism characteristic and the magnetic characteristic of a final formed body in compressing powders for powder metallurgy such as iron powders and iron-based powders. SOLUTION: In compressing powders for powder metallurgy using a forming die, the forming pressure is set to >=5 tons/cm2, the vibration is applied to the forming die, and the amplitude without pressure is set to 0.002 to 0.10 mm. The amplitude with pressure of 5 tons/cm2 is set to >=20% of the amplitude without pressure. Compression forming is achieved by filling powders for powder metallurgy including

43. 发明专利

JP2000144206A COMPRESSION MOLDING METHOD OF POWDER FOR POWDER METALLURGY 失效
公开(公告)号：JP2000144206A
公开(公告)日：2000-05-26
申请号：JP31503198
申请日：1998-11-05
申请人： KOBE STEEL LTD
发明人： TSUCHIDA TAKEHIRO , KAKO HIROSHI , SEKI YOSHIKAZU , SATO MASAAKI , AKAGI NOBUAKI , SAWAYAMA TETSUYA
IPC分类号： B22F3/02 , B22F3/035
摘要： PROBLEM TO BE SOLVED: To surely obtain a compression molded body of high density by filling a powder for powder metallurgy with a lubricant blended therein in a forming die to an inner wall surface the lubricant is applied, and setting the forming temperature in the compression molding to be not lower than the melting point of the lubricant blended in the powder. SOLUTION: In compression molding a powder for powder metallurgy such as iron powder and iron-based alloy powder, the forming temperature is controlled to >= Tm, more preferably, >= Tm and

44. 发明专利

JPH06145702A PRODUCTION OF STEEL POWDER FOR POWDER METALLURGY AND SINTERED PARTS 失效
公开(公告)号：JPH06145702A
公开(公告)日：1994-05-27
申请号：JP29607092
申请日：1992-11-05
申请人： KOBE STEEL LTD
发明人： AKAGI NOBUAKI , SAKUMA HITOSHI , TAKAI TADASHIGE
IPC分类号： B22F1/02 , B22F3/10 , C22C33/02
摘要： PURPOSE:To obtain steel powder capable of obtaining sintered parts small in a dimensional changing rate and having good soft magnetic properties by increasing the content of phosphorus in iron-phosphorus alloy powder diffusely joined to the surface of pure iron into a specified ratio. CONSTITUTION:At the time of diffusely joining iron phosphorus alloy powder to the surface of pure iron powder, iron-phosphorus alloy powder having 22 to 28wt.% phosphorus content is diffusely joined. In this way, steel powder contg. 0.1 to 1.2wt.% phosphorus, free from the segregation of phosphorus and excellent in compressibility can be obtd. This steel powder is subjected to compacting and sintering, by which the sintered parts small in a dimensional changing rate and the dispersion of dimension and having good soft magnetic properties can be obtd.

45. 发明专利

JPH0633101A PRODUCTION OF HIGH-STRENGTH ALLOY STEEL POWDER FOR POWDER METALLURGY 失效
公开(公告)号：JPH0633101A
公开(公告)日：1994-02-08
申请号：JP18694192
申请日：1992-07-14
申请人： KOBE STEEL LTD
发明人： HANAOKA HIROTAKA , AKAGI NOBUAKI
IPC分类号： B22F1/00 , B22F5/00 , C22C33/02
摘要： PURPOSE:To obtain the steel powder for powder metallurgy having high compressibility and high strength by separately mixing iron powder and respective fine particulate powders of Cu, Ni and Mo, subjecting the respective powders to a diffusion treatment at respectively specific temps. to disintegrate the grains thereof, then mixing the powders so as to have specified components. CONSTITUTION:The fine powders of the respective metals Cu, Ni and Mo are separately mixed with the iron powder or only the Cu is separated and is mixed with the iron powder. The powder mixture is subjected to the diffusion treatment at 700 to 850 deg.C in the case of mixing of the Cu and the iron powder, is subjected to the diffusion treatment at 850 to 950 deg.C in the case of mixing of the Mo and the iron powder, is subjected to the diffusion treatment at 900 to 1000 deg.C in the case of mixing of the Mo and the iron powder and is subjected to the diffusion treatment at 900 to 950 deg.C in the case of mixing of the Ni and the Mo and the iron powder, by which the Cu, the Ni and the Mo are respectively stuck to the iron power surface. After the powder mixture is disintegrated, the powders are so mixed as to have the specified component compounding. The powders are preferably so mixed that the compsn. of the alloy steel powder after the mixing contains 1 to 2% Cu, 2 to 8% Ni and 0.5 to 1.0% Mo.

46. 发明专利

JPH0625793A FE-CU-NI COMPOUND POWDER FOR POWDER METALLURGY AND ITS MANUFACTURE AS WELL AS SINTERED BODY USING THE SAME POWDER 失效
公开(公告)号：JPH0625793A
公开(公告)日：1994-02-01
申请号：JP18124992
申请日：1992-07-08
申请人： KOBE STEEL LTD , KOBELCO KAKEN KK
发明人： HANAOKA HIROTAKA , AKAGI NOBUAKI , SAKUMA HITOSHI , ITANI HIROSHI , FUJIWARA KAZUO , OOYASHIKI AKIO
IPC分类号： B22F1/02 , C22C33/02
摘要： PURPOSE:To obtain Fe-Cu-Ni compound powder for powder metallurgy capable of obtaining a homogeneous sintered body having high density and high strength by applying Ni electroless plating to the surface of iron powder and thereafter applying Cu-Ni electroless plating thereto to regulate its compsn. into a specified one. CONSTITUTION:The Fe-Cu-Ni compound powder for powder metallurgy is one which the surface of the iron powder is applied with the Cu-Ni plated layer, and its compsn. is constituted of, by weight, 0.1 to 10% Cu and 1 to 20% Ni, and the balance Fe with inevitable impurities. By subjecting it to compacting and sintering, a sintered body having high density and dimensional stability as well as high strength can be obtd. This compound powder can inexpensively and efficiently be manufactured by previously applying the Ni electroless plating to the surface of the iron powder and thereafter applying the Cu-Ni electroless plating thereto to uniformly stick the Cu-Ni alloy.

47. 发明专利

JP2002003980A COMPACT BY POWDER METALLURGY AND ITS PRODUCTION METHOD 失效
公开(公告)号：JP2002003980A
公开(公告)日：2002-01-09
申请号：JP2001159523
申请日：2001-05-28
申请人： KOBE STEEL LTD
发明人： SATO MASAAKI , SUZUKI HIRONORI , AKAGI NOBUAKI , KAWAI SHINYA , LUTHERAN MICHAEL E
IPC分类号： B22F1/00 , C22C33/02 , C22C38/00
摘要： PROBLEM TO BE SOLVED: To provide a compact by powder metallurgy excellent in machinability without deteriorating its essential fatigue strength to cope with an even- increasing demand for the compact by powder metallurgy having high precision and complicated shape in recent years, and to provide its production method. SOLUTION: In this invention, iron crystal grains in a compacted product by powder metallurgy are refined by using iron powder obtained by dispersing machinability improving components into iron crystal grains, so that its fatigue strength is improved.

48. 发明专利

JPH11229002A COMPOSITE LUBRICANT FOR POWDER METALLURGY, POWDERY MIXTURE FOR POWDER METALLURGY EXCELLENT IN DIMENSIONAL STABILITY AND PRODUCTION OF SINTERED PRODUCT USING THE POWDERY MIXTURE 失效
公开(公告)号：JPH11229002A
公开(公告)日：1999-08-24
申请号：JP3768298
申请日：1998-02-19
申请人： KOBE STEEL LTD
发明人： AKAGI NOBUAKI , SEKI YOSHIKAZU , FUJISAWA KAZUHISA
IPC分类号： C10M105/24 , B22F3/02 , C10M127/00 , C10N40/20
摘要： PROBLEM TO BE SOLVED: To reduce the dispersion of dimensions in a sintering stage among the batches of powdery mixtures for powder metallurgy and to increase the dimensional stability therein by blending higher fatty acid metallic salt powder with a wax lubricant as a dewaxing promoter. SOLUTION: As for a wax lubricant, the one showing viscosity lower than that of higher fatty acid metallic salt in a sintering process to promote dewaxing, and the one in which, in metallic powder, higher fatty acid metallic salt powder is contained as a lubricant, and furthermore, a wax lubricant is contained as a dewaxing promoter for higher fatty acid metallic salt powder are preferable. As for the production of the sintered product, sintering is executed preferably in an atmosphere of a denatured gas essentially consisting of a town gas and/or a natural gas after compacting. It is required that, ordinarily, dewaxing is completed in a low temp. region before the arrival to a dewaxing temp. region of about 600 deg.C. For this purpose, in the case, together with stearic acid metallic salt powder, the wax lubricant of an amt. less than the equivalent to that of the stearic acid metallic salt powder is used, the dewaxing is accelerated by the wax lubricant to suppress the dispersion of the rate of the dimensional change.

49. 发明专利

JPH10305927A POWDER PACKING METHOD FOR PREVENTING SEPARATION OF POWDER AND POWDER COLLECTING DEVICE FOR PREVENTING SEPARATION OF POWDER 失效
公开(公告)号：JPH10305927A
公开(公告)日：1998-11-17
申请号：JP11562397
申请日：1997-05-06
申请人： KOBE STEEL LTD
发明人： SAWAYAMA TETSUYA , KAGAWA MASAHIKO , AKAGI NOBUAKI , HANAOKA HIROTAKA
IPC分类号： B65B1/06 , B65B37/02 , B65G65/32
摘要： PROBLEM TO BE SOLVED: To prevent the separation of powder when the powder is transferred into a container. SOLUTION: A powder collecting device 1 has a supply port 15 at an upper cylindrical part 2a, a sieve 3 sandwiched by the upper and lower cylindrical parts 2a, 2b, a conical part 4 having a slant angle larger than an angle of repose below the lower cylindrical part 2b, and a cylindrical part 5 having a small diameter. Powder is supplied to the supply port 15 from a container and is transferred into a packing container 7.

50. 发明专利

JP2000239705A PRODUCTION OF HIGH DENSITY MOLDED BODY 失效
公开(公告)号：JP2000239705A
公开(公告)日：2000-09-05
申请号：JP3921399
申请日：1999-02-17
申请人： KOBE STEEL LTD
发明人： SAWAYAMA TETSUYA , SATO MASAAKI , AKAGI NOBUAKI , SEKI YOSHIKAZU , TSUCHIDA TAKEHIRO , KAGUCHI HIROSHI
IPC分类号： B22F3/02 , B22F3/14
摘要： PROBLEM TO BE SOLVED: To control the density of the molded body to the one close to true density even without specially executing the stages of reheating, forging or the like after sintering and to improve the moldability and strength thereof by subjecting a mixture of iron powder or iron alloy powder and a strength controlling component to compression molding in a specified temp. range. SOLUTION: Iron powder or iron alloy powder contg. Ni, Mo, Mn, Cr, Si, S or the like is mixed with a strength controlling component such as graphite by about 0.1 to 2.0 wt.%. The mixture is subjected to compression molding in the temp. range of >400 to 1000 deg.C preferably in an inert atmosphere or in a vacuum. In this way, a high density molded body having 400 deg.C to e.g. 650 deg.C in which the strength controlling component such as graphite is not sufficiently dipsersed to increase the workability of the molded body, if required, moreover, heat treatment is executed to increase its strength, or its temp. is controlled, e.g. to 650 to 1000 deg.C in which graphite or the like is sufficiently dispersed, by which the strength of the molded body can be increased.

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