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1. 发明专利

AT466966T 未知
公开(公告)号：AT466966T
公开(公告)日：2010-05-15
申请号：AT01120906
申请日：2001-08-30
申请人： JFE STEEL CORP , HITACHI LTD
发明人： NAKAMURA NAOMICHI , UENOSONO SATOSHI , UNAMI SHIGERU , FUJINAGA MASASHI , YOSHIMURA TAKASHI , IIJIMA MITSUMASA , KOIZUMI SHIN , ANMA HIROYUKI , HATAI YASUO
IPC分类号： B22F3/12 , C22C33/02 , B22F3/10
摘要： A sintered iron-based powder metal body with outstandingly lower re-compacting load and having a high density and a method of manufacturing an iron-based sintered component with fewer pores of a sharp shape and having high strength and high density, the method comprising mixing, an iron-based metal powder containing at most about 0.05% of carbon, at most about 0.3% of oxygen, at most about 0.010% of nitrogen, with at least about 0.03% and at most about 0.5% of graphite powder and a lubricant, preliminarily compacting the mixture into a preform, the density of which is about 7.3 Mg/m or more, and preliminarily sintering the preform in a non-oxidizing atmosphere in which a partial pressure of nitrogen is about 30 kPa or less at a temperature of about 1000 DEG C or higher and about 1300 DEG C or lower, thereby forming a sintered iron-based powder metal body with outstandingly lower re-compacting load and having high deformability, the density of which is about 7.3 Mg/m or more and which contains at least about 0.10% and at most about 0.50 of carbon, at most about 0.010% of oxygen and at most about 0.010% of nitrogen, and which comprises at most about 0.02% of free carbon, and, further applying re-compaction and re-sintering and/or heat treatment thereby forming a sintered component, as well as the method alternatively comprising applying preliminary sintering in an atmosphere with no restriction of the nitrogen partial pressure and then annealing instead of the sintering step, thereby obtaining a sintered iron-based powder metal body with the nitrogen content of at most about 0.010%.

3. 发明专利

DE10308274B4 未知
公开(公告)号：DE10308274B4
公开(公告)日：2007-03-01
申请号：DE10308274
申请日：2003-02-26
申请人： HITACHI LTD
发明人： NAKAMURA NAOMICHI , UNAMI SHIGERU , UENOSONO SATOSHI , FUJINAGA MASASHI , YOSHIMURA TAKASHI , IIJIMA MITSUMASA , KOIZUMI SHIN , AMMA HIROYUKI
IPC分类号： B22F3/12 , B22F3/10 , B22F3/17 , C22C33/02 , C22C38/00
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.

4. 发明专利

DE60131945D1 未知
公开(公告)号：DE60131945D1
公开(公告)日：2008-01-31
申请号：DE60131945
申请日：2001-10-26
申请人： HITACHI LTD
发明人： YOSHIMURA TAKASHI , IIJIMA MITSUMASA , KOIZUMI SHIN , HATAI YASUO
IPC分类号： B21J1/02 , C22C33/02 , B21J1/06 , B21J5/00 , B21J5/06 , B22F3/17 , B22F3/20
摘要： A method of forging a raw material for sintering and forging. The method comprises the steps of: (a) compacting metallic powder containing iron as a main component and graphite to obtain a compact having a predetermined density; (b) sintering the compact at a temperature ranging from 700 to 1000 DEG C to form a sintered compact having a texture in which graphite is retained at grain boundary of metal powder; (c) compressing the sintered compact from two directions to obtain a compressed sintered compact; and (d) extruding the compressed sintered compact upon pressing the compressed sintered compact from the two directions in a manner that a pressure in one of the two directions is reduced relative to a pressure in the other of the two directions to accomplish extrusion forging.

5. 发明专利

DE60131945T2 未知
公开(公告)号：DE60131945T2
公开(公告)日：2008-04-30
申请号：DE60131945
申请日：2001-10-26
申请人： HITACHI LTD
发明人： YOSHIMURA TAKASHI , IIJIMA MITSUMASA , KOIZUMI SHIN , HATAI YASUO
IPC分类号： B21J1/02 , C22C33/02 , B21J1/06 , B21J5/00 , B21J5/06 , B22F3/17 , B22F3/20
摘要： A method of forging a raw material for sintering and forging. The method comprises the steps of: (a) compacting metallic powder containing iron as a main component and graphite to obtain a compact having a predetermined density; (b) sintering the compact at a temperature ranging from 700 to 1000 DEG C to form a sintered compact having a texture in which graphite is retained at grain boundary of metal powder; (c) compressing the sintered compact from two directions to obtain a compressed sintered compact; and (d) extruding the compressed sintered compact upon pressing the compressed sintered compact from the two directions in a manner that a pressure in one of the two directions is reduced relative to a pressure in the other of the two directions to accomplish extrusion forging.

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