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2. 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

DE60030063D1 未知
公开(公告)号：DE60030063D1
公开(公告)日：2006-09-28
申请号：DE60030063
申请日：2000-03-17
申请人： JFE STEEL CORP , HITACHI LTD
发明人： YOSHIMURA TAKASHI , AMMA HIROYUKI , FUJINAGA MASASHI , IIJIMA MITSUMASA , HATAI YASUO , MATSUMOTO TAKAYUKI , UENOSONO SATOSHI , UNAMI SHIGERU
IPC分类号： B22F3/02 , C22C33/02
摘要： In a preliminary molding step 1, a metallic powder mixture 7 obtained by blending an iron-based metal powder 7a with graphite 7b such that the graphite is present in an amount of preferably not less than 0.1% by weight, more preferably not less than 0.3% by weight, is compacted into a preform 8 having a density of not less than 7.3g/cm . In a provisional sintering step 2, the preform 8 is provisionally sintered at a predetermined temperature to form a metallic powder-molded body 9 having a structure in which the graphite remains along a grain boundary of the metal powder. In a re-compaction step 3, the metallic powder-molded body 9 is re-compacted into a re-compacted body 10. In a re-sintering step 4, the re-compacted body 10 is re-sintered to obtain a sintered body 11. In a heat treatment step 5, the sintered body 11 is heat-treated to obtain a heat-treated sintered body 11. Accordingly, in accordance with the present invention, there are provided a re-compacted body produced from a metallic powder-molded body having an excellent deformability which is suitably applied to the production of machine parts exhibiting high mechanical properties due to the use of sintered metal, and a sintered body produced from the re-compacted body as well as a process for the production thereof.

4. 发明专利

DE60030063T2 未知
公开(公告)号：DE60030063T2
公开(公告)日：2007-01-04
申请号：DE60030063
申请日：2000-03-17
申请人： JFE STEEL CORP , HITACHI LTD
发明人： YOSHIMURA TAKASHI , AMMA HIROYUKI , FUJINAGA MASASHI , IIJIMA MITSUMASA , HATAI YASUO , MATSUMOTO TAKAYUKI , UENOSONO SATOSHI , UNAMI SHIGERU
IPC分类号： B22F3/02 , C22C33/02
摘要： In a preliminary molding step 1, a metallic powder mixture 7 obtained by blending an iron-based metal powder 7a with graphite 7b such that the graphite is present in an amount of preferably not less than 0.1% by weight, more preferably not less than 0.3% by weight, is compacted into a preform 8 having a density of not less than 7.3g/cm . In a provisional sintering step 2, the preform 8 is provisionally sintered at a predetermined temperature to form a metallic powder-molded body 9 having a structure in which the graphite remains along a grain boundary of the metal powder. In a re-compaction step 3, the metallic powder-molded body 9 is re-compacted into a re-compacted body 10. In a re-sintering step 4, the re-compacted body 10 is re-sintered to obtain a sintered body 11. In a heat treatment step 5, the sintered body 11 is heat-treated to obtain a heat-treated sintered body 11. Accordingly, in accordance with the present invention, there are provided a re-compacted body produced from a metallic powder-molded body having an excellent deformability which is suitably applied to the production of machine parts exhibiting high mechanical properties due to the use of sintered metal, and a sintered body produced from the re-compacted body as well as a process for the production thereof.

5. 发明公开

EP1097770A4 METALLIC POWDER MOLDING MATERIAL AND ITS RE-COMPRESSION MOLDED BODY AND SINTERED BODY OBTAINED FROM THE RE-COMPRESSION MOLDED BODY AND PRODUCTION METHODS THEREOF 有权
标题翻译：金属粉末材料和物品再压缩体及烧结体再压缩方法
公开(公告)号：EP1097770A4
公开(公告)日：2004-01-02
申请号：EP00909684
申请日：2000-03-17
申请人： UNISIA JECS CORP , JFE STEEL CORP
发明人： YOSHIMURA TAKASHI , AMMA HIROYUKI , FUJINAGA MASASHI , IIJIMA MITSUMASA , HATAI YASUO , MATSUMOTO TAKAYUKI , UENOSONO SATOSHI , UNAMI SHIGERU
IPC分类号： C22C33/02 , B22F3/02
CPC分类号： C22C33/02 , B22F2998/00 , B22F2998/10 , B22F3/16 , C22C33/0228 , B22F3/02 , B22F3/10 , B22F3/20
摘要： A re-compression molded body of a metallic powder molding material having an excellent deformability suitable for obtaining high-mechanical-strength mechanical parts made from sintered metals and a sintered body obtained from the re-compression molded body, and production methods thereof comprising the following steps: In a preforming process (1), metallic powder (7), obtained by mixing metal powder (7a) mainly containing iron with preferably at least 0.1 wt.%, more preferably at least 0.3 wt.% of graphite (7b), is compact-pressed to form a preform (8) with a density of at least 7.3 g/cm3. In a temporary sintering process (2), the preform (8) is temporarily sintered at a preset temperature to form a metallic powder molding material (9) having a structure in which graphite still remains in a metal powder grain boundary. In a re-compression process (3), the metallic powder molding material (9) is re-compression-molded to obtain a re-compression molded body (10). In a re-sintering process (4), the re-compression-molded body (10) is re-sintered to obtain a sintered body (11). In a heat treating process (5), the sintered body (11) is heat-treated to obtain a heat-treated sintered body (11).

6. 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.

7. 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.

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