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1. 发明专利

DE10308274A1 未知
公开(公告)号：DE10308274A1
公开(公告)日：2003-12-11
申请号：DE10308274
申请日：2003-02-26
申请人： HITACHI UNISIA AUTOMOTIVE LTD
发明人： NAKAMURA NAOMICHI , UNAMI SHIGERU , UENOSONO SATOSHI , FUJINAGA MASASHI , YOSHIMURA TAKASHI , IIJIMA MITSUMASA , KOIZUMI SHIN , AMMA HIROYUKI
IPC分类号： B22F3/10 , B22F3/17 , C22C33/02 , C22C38/00 , B22F3/12
摘要： A high density iron based forged part such as a mechanical part is produced by a method comprising the following steps in the sequence set forth: (a) preparing iron based powder mixture containing iron based metal powder and graphite powder; (b) preliminarily compacting the iron based powder mixture to form a preliminary compact; (c) sintering the preliminary compact in a non-oxidizing atmosphere whose nitrogen partial pressure is 30 kPa or less, at a temperature of 950° C. or more and of 1300° C. or less to form a forming material; and (d) forging the forming material by closed die forging or enclosed die forging to produce a high density forged part.

2. 发明专利

JP2003253372A METHOD FOR MANUFACTURING HIGH DENSITY IRON-BASED FORGED PARTS 审中-公开
公开(公告)号：JP2003253372A
公开(公告)日：2003-09-10
申请号：JP2002054244
申请日：2002-02-28
申请人： JFE STEEL KK , HITACHI UNISIA AUTOMOTIVE LTD
发明人： NAKAMURA NAOMICHI , UNAMI SHIGERU , UENOSONO SATOSHI , FUJINAGA MASASHI , YOSHIMURA TAKASHI , IIJIMA MITSUMASA , KOIZUMI SUSUMU , YASUMA HIROYUKI
IPC分类号： B22F3/10 , B22F3/17 , C22C33/02 , C22C38/00
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing iron-based forged parts with high density and high accuracy of dimension. SOLUTION: This manufacturing method comprises preliminarily compression molding an iron-based mixed powder containing an iron-based metal powder and a graphite powder into a compressed preform, presintering the compressed preform in a non-oxidizing atmosphere having a nitrogen partial pressure of 30 kPa or lower, at 950°C or higher but 1,300°C or lower, or further annealing it into a material to be formed, and subjecting it to full enclosed die forging or closed die forging. The density of the compressed preform is preferably less than 7.3 Mg/m 3 . COPYRIGHT: (C)2003,JPO

3. 发明专利

JP2004270012A Method for producing iron-based sintered compact and compressiom molded product for sintering 有权
公开(公告)号：JP2004270012A
公开(公告)日：2004-09-30
申请号：JP2003065676
申请日：2003-03-11
申请人： Hitachi Unisia Automotive Ltd , Jfe Steel Kk , Jfeスチール株式会社 , 株式会社日立ユニシアオートモティブ
发明人： NAKAMURA NAOMICHI , UENOSONO SATOSHI , UNAMI SHIGERU , FUJINAGA MASASHI , YOSHIMURA TAKASHI , KOIZUMI SUSUMU , YASUMA HIROYUKI , YUKINAWA MAKOTO
IPC分类号： B22F3/10 , B22F3/17
摘要： PROBLEM TO BE SOLVED: To provide a method for producing a high-density iron-based sintered compact, wherein the degree of progress of finish sintering at a relatively low temperature is high while the reduction in manufacturing cost of the sintered compact, especially the prevention of cost increase due to press molding, is realized and to provide a compression molded product for sintering which is used in producing such an iron-based sintered compact.
SOLUTION: The method for producing an iron-based sintered compact comprises subjecting an iron-based metallic powder to powder compression molding and pre-sintering to give a preform and subjecting the preform to cold forging and finish sintering. In the method, the distortion quantity of the cold-forged, compression molded product is measured, and the sintering conditions are changed according to the results of the measurement. Desirably, the distortion of the compressed molding is determined from the half width of the X-ray diffraction line of the Fe(200) face of the compression molded product by nondestructive testing, especially X-ray diffractometry.
COPYRIGHT: (C)2004,JPO&NCIPI

4. 发明专利

JP2005040811A Closed forging device 有权
标题翻译：封闭式锻造装置
公开(公告)号：JP2005040811A
公开(公告)日：2005-02-17
申请号：JP2003201456
申请日：2003-07-25
申请人： Hitachi Unisia Automotive Ltd , 株式会社日立ユニシアオートモティブ
发明人： YOSHIMURA TAKASHI
IPC分类号： B21J5/02 , B21J13/02
摘要： PROBLEM TO BE SOLVED: To provide a closed forging device which can form a forged product having high accuracy even when die strength can not be sufficiently secured due to the limitation of a shape or the like of the forged product and pressurization force during the press-cutting of the forged product is limited. SOLUTION: A closed space R is formed by a die 1, a mandrel 4, and upper/lower pressurizing punches 2, 3. A pre-molded body P, which is stored in the closed space R as a material, is molded as a sintered cold-forged product W in a nearly basin-like shape having a shaft hole H with a flange part F and a tooth-shaped part G. When the sintered cold-forged product W is pressed and cut after the pressurizing punch 2 reaches the lower dead center position, a part of the sintered cold-forged product W is projected from escape recessed parts 11, 12 previously formed to the die 1 and the mandrel 4. As a result, the shape accuracy of the sintered cold-forged product W can be enhanced without the rapid increase of the pressurization force during the press-cutting. COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种闭合锻造装置，即使由于锻造产品的形状等的限制和加压力的限制，即使模具强度不能充分确保，也可以形成具有高精度的锻造制品锻造产品的压制是有限的。解决方案：封闭空间R由模具1，心轴4和上/下加压冲头2,3形成。作为材料存储在封闭空间R中的预成型体P为成型为具有凸缘部F和齿形部G的轴孔H的近似盆状的烧结冷锻产品W.当在加压冲头之后压制和切割烧结的冷锻产品W 2到达下死点位置时，烧结冷锻产品W的一部分从预先形成的模具1和心轴4的避让凹部11,12上突出。结果，烧结冷锻产品W的形状精度，可以增强锻造品W，而不会在加压切割期间快速增加加压力。版权所有（C）2005，JPO＆NCIPI

5. 发明专利

JP2003253304A MEMBER FOR MAGNETIC CORE AND ITS MANUFACTURING METHOD 审中-公开
公开(公告)号：JP2003253304A
公开(公告)日：2003-09-10
申请号：JP2002053852
申请日：2002-02-28
申请人： JFE STEEL KK , HITACHI UNISIA AUTOMOTIVE LTD
发明人： NAKAMURA NAOMICHI , UENOSONO SATOSHI , UNAMI SHIGERU , FUJINAGA MASASHI , YOSHIMURA TAKASHI , IIJIMA MITSUMASA , KOIZUMI HIROSHI , YASUMA HIROYUKI
IPC分类号： B22F3/00 , B22F3/24 , C22C38/00 , H01F1/22
摘要： PROBLEM TO BE SOLVED: To provide a member for a magnetic core, which is high in density, surface hardness, and magnetic flux density. SOLUTION: A mixed powder which is prepared by blending and mixing an iron-base powder with a specified amount of lubricant, or further a specified amount of graphite powder is preliminarily molded as a pre-molded body. The pre-molded body is subjected to sintering treatment at a temperature of ≥800°C, preferably >1,000°C, or further to annealing treatment at a temperature of 400-700°C to obtain a sintered compact. The sintered compact is subjected to cold-forging and then to heat-treatment at a temperature of ≤600°C, preferably ≥300°C and ≤600°C. COPYRIGHT: (C)2003,JPO

6. 发明专利

JP2004091929A Sintering and cold forging method 审中-公开
公开(公告)号：JP2004091929A
公开(公告)日：2004-03-25
申请号：JP2003347518
申请日：2003-10-06
申请人： Hitachi Unisia Automotive Ltd , Jfe Steel Kk , Jfeスチール株式会社 , 株式会社日立ユニシアオートモティブ
发明人： YOSHIMURA TAKASHI , YASUMA HIROYUKI
IPC分类号： B21J3/00 , B21J5/00 , B22F3/02 , B22F3/17
摘要： PROBLEM TO BE SOLVED: To obtain a sintered product of high density. SOLUTION: Metal powder is subjected to temporary compression molding inside a die to form a preliminary preform. A lubricant is applied to the preliminary preform, and the preliminary preform coated with the lubricant is subjected to normal compression molding inside a die. Next, the preliminary preform subjected to the compression molding is temporarily sintered to form a sintered preform for cold forging. The sintered preform is subjected to cold forging, so that the sintered product is produced. COPYRIGHT: (C)2004,JPO

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