公开(公告)号：US06503443B1

公开(公告)日：2003-01-07

申请号：US09647862

申请日：2000-10-06

申请人： Takashi Yoshimura ,  Hiroyuki Amma ,  Masashi Fujinaga ,  Mitsumasa Iijima ,  Yasuo Hatai ,  Takayuki Matsumoto ,  Satoshi Uenosono ,  Shigeru Unami

发明人： Takashi Yoshimura ,  Hiroyuki Amma ,  Masashi Fujinaga ,  Mitsumasa Iijima ,  Yasuo Hatai ,  Takayuki Matsumoto ,  Satoshi Uenosono ,  Shigeru Unami

IPC分类号： B22F316

CPC分类号： C22C33/02 ,  B22F2998/00 ,  B22F2998/10 ,  B22F3/16 ,  C22C33/0228 ,  B22F3/02 ,  B22F3/10 ,  B22F3/20

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 7.3 g/cm3. 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.

摘要翻译： 在预成型步骤1中，通过将铁基金属粉末7a与石墨7b共混而得到的金属粉末混合物7，使得石墨的存在量优选为0.1重量％以上，更优选为0.3以上 重量％被压实成密度不小于7.3g / cm 3的预成型体8。 在预烧结步骤2中，将预成型体8在规定温度下进行预烧结，形成金属粉末成形体9，该金属粉末成型体9具有沿着金属粉末的晶界留下的石墨的结构。 在再压制步骤3中，将金属粉末成型体9再压制成再压制体10.在再烧结步骤4中，重新烧结再压制体10以获得烧结体 在热处理工序5中，对烧结体11进行热处理，得到热处理烧结体11.因此，根据本发明，提供了一种由金属粉末 - 具有优异的变形性的成型体，其适用于由于使用烧结金属而显示出高机械性能的机械部件的制造，以及由再压制体制造的烧结体及其制造方法。

公开(公告)号：US06905530B2

公开(公告)日：2005-06-14

申请号：US10180133

申请日：2002-06-27

申请人： Takashi Yoshimura ,  Hiroyuki Amma ,  Masashi Fujinaga ,  Mitsumasa Iijima ,  Yasuo Hatai ,  Takayuki Matsumoto ,  Satoshi Uenosono ,  Shigeru Unami

发明人： Takashi Yoshimura ,  Hiroyuki Amma ,  Masashi Fujinaga ,  Mitsumasa Iijima ,  Yasuo Hatai ,  Takayuki Matsumoto ,  Satoshi Uenosono ,  Shigeru Unami

IPC分类号： C22C33/02

CPC分类号： C22C33/02 ,  B22F2998/00 ,  B22F2998/10 ,  B22F3/16 ,  C22C33/0228 ,  B22F3/02 ,  B22F3/10 ,  B22F3/20

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 7.3 g/cm3. 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.

摘要翻译： 在预成型步骤1中，通过将铁基金属粉末7a与石墨7b共混而获得的金属粉末混合物7，使得石墨以优选不小于0.1重量％的量存在，更优选不少于 超过0.3重量％，被压实成密度不小于7.3g / cm 3的预成型体8。 在预烧结步骤2中，将预成型体8在规定温度下进行预烧结，形成金属粉末成形体9，该金属粉末成型体9具有沿着金属粉末的晶界留下的石墨的结构。 在再压制步骤3中，将金属粉末成型体9再压制成再压制体10。 在再烧结工序4中，重新烧结再压制体10，得到烧结体11。 在热处理工序5中，对烧结体11进行热处理，得到热处理烧结体11.因此，根据本发明，提供一种由金属粉末成型体 具有优异的变形性，其适用于由于使用烧结金属而显示出高机械性能的机器部件的制造，以及由再压制体制造的烧结体及其制造方法。

公开(公告)号：US06696014B2

公开(公告)日：2004-02-24

申请号：US10280529

申请日：2002-10-25

申请人： Naomichi Nakamura ,  Satoshi Uenosono ,  Shigeru Unami ,  Masashi Fujinaga ,  Takashi Yoshimura ,  Mitsumasa Iijima ,  Shin Koizumi ,  Hiroyuki Anma ,  Yasuo Hatai

发明人： Naomichi Nakamura ,  Satoshi Uenosono ,  Shigeru Unami ,  Masashi Fujinaga ,  Takashi Yoshimura ,  Mitsumasa Iijima ,  Shin Koizumi ,  Hiroyuki Anma ,  Yasuo Hatai

IPC分类号： B22F312

CPC分类号： C22C33/0264 ,  B22F3/1007 ,  B22F2998/10 ,  B22F2999/00 ,  C22C33/02 ,  B22F3/02 ,  B22F3/10 ,  C22C33/0207 ,  B22F1/0096

摘要： A sintered iron-based powder metal body with 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.

摘要翻译： 具有较低再压缩载荷并具有高密度的烧结铁基粉末金属体以及制造具有较小的尖锐形状和高强度和高密度的孔的铁基烧结组件的方法。

公开(公告)号：US06514307B2

公开(公告)日：2003-02-04

申请号：US09934428

申请日：2001-08-21

申请人： Naomichi Nakamura ,  Satoshi Uenosono ,  Shigeru Unami ,  Masashi Fujinaga ,  Takashi Yoshimura ,  Mitsumasa Iijima ,  Shin Koizumi ,  Hiroyuki Anma ,  Yasuo Hatai

发明人： Naomichi Nakamura ,  Satoshi Uenosono ,  Shigeru Unami ,  Masashi Fujinaga ,  Takashi Yoshimura ,  Mitsumasa Iijima ,  Shin Koizumi ,  Hiroyuki Anma ,  Yasuo Hatai

IPC分类号： C22C3302

CPC分类号： C22C33/0264 ,  B22F3/1007 ,  B22F2998/10 ,  B22F2999/00 ,  C22C33/02 ,  B22F3/02 ,  B22F3/10 ,  C22C33/0207 ,  B22F1/0096

摘要： An 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/m3 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° C. or higher and about 1300° 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/m3 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%.

摘要翻译： 一种烧结铁基粉末金属体，具有显着降低的再压实载荷并具有高密度，并且制造具有较少的尖锐形状的孔并具有高强度和高密度的铁基烧结组分的方法，该方法包括混合 ，含有最多约0.05％的碳，至多约0.3％的氧，至多约0.010％的氮，至少约0.03％和至多约0.5％的石墨粉末和润滑剂的铁基金属粉末， 将混合物预先压实成预制件，其密度为约7.3Mg / m 3以上，并且在约10分钟的温度下在氮气分压为约30kPa以下的非氧化性气氛中预先烧结预成型体 1000℃以上约1300℃以下，从而形成烧结的铁基粉末金属体，具有显着降低的再压缩载荷，并具有高变形能力，其密度为约7.3Mg / m 3以上， 其中 至少约0.10％，至多约0.50碳，至多约0.010％的氧和至多约0.010％的氮，并且其包含至多约0.02％的游离碳，并且进一步应用再压实和 再烧结和/或热处理，从而形成烧结组分，以及所述方法或者包括在不限制氮分压的气氛中进行初步烧结，然后退火而不是烧结步骤，由此获得烧结的铁 - 含氮量最多为0.010％的粉末金属体。

公开(公告)号：US06454991B1

公开(公告)日：2002-09-24

申请号：US09984300

申请日：2001-10-29

申请人： Takashi Yoshimura ,  Mitsumasa Iijima ,  Shin Koizumi ,  Yasuo Hatai

发明人： Takashi Yoshimura ,  Mitsumasa Iijima ,  Shin Koizumi ,  Yasuo Hatai

IPC分类号： B22F320

CPC分类号： C22C33/0228 ,  B22F3/20 ,  B22F2998/10 ,  C22C33/02 ,  B22F3/02 ,  B22F3/10

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° 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.

摘要翻译： 锻造用于烧结和锻造的原料的方法。 该方法包括以下步骤：（a）压制以铁为主要成分的金属粉末和石墨，以获得具有预定密度的压块; （b）在700〜1000℃的温度下烧结成形体，形成具有石墨保留在金属粉末的晶界的结构的烧结体; （c）从两个方向压缩烧结体，得到压缩烧结体; 以及（d）以两个方向中的一个方向的压力相对于两个方向上的另一个方向的压力来减小压缩压缩烧结体从两个方向挤出压缩的烧结体，以实现挤压锻造。