公开(公告)号：US06482349B1

公开(公告)日：2002-11-19

申请号：US09421237

申请日：1999-10-20

申请人： Seiichi Kohara ,  Tsutomu Harada

发明人： Seiichi Kohara ,  Tsutomu Harada

IPC分类号： B29C4336

CPC分类号： B30B15/0011 ,  B29C43/361 ,  B29C2043/3233 ,  B29C2043/3618 ,  B29C2043/566 ,  B30B15/0017

摘要： A powder pressing apparatus comprises an upper punch and a lower punch for compression of a powder in a cavity formed in a through hole of a die. A gap between a side surface of the lower punch and a side surface of the through hole of the die is sealed by a sealing member. A lubricant is supplied with a gas from a nozzle in the side surface of the lower punch to the side surface of the through hole, and the lubricant applied to the side surface of the through hole is spread by an absorbing member. The cavity is filled with the powder while the cavity is under suction by a reduced pressure provided from the nozzle in the side surface of the lower punch. During the suction, a filtering member provides filtration for the lower punch not to draw the powder in.

摘要翻译： 粉末压制装置包括上冲头和下冲头，用于在模具的通孔中形成的空腔中的粉末压缩。 下冲头的侧面与模具的通孔的侧面之间的间隙由密封部件密封。 润滑剂从下冲头的侧面的喷嘴向通孔的侧面供给气体，并且施加到通孔的侧表面的润滑剂被吸收部件扩散。 通过从下冲头的侧表面中的喷嘴提供的减压，空腔被填充粉末，同时空腔被吸入。 在抽吸期间，过滤构件为下冲头提供过滤以不将粉末吸入。

公开(公告)号：US06649124B2

公开(公告)日：2003-11-18

申请号：US09901602

申请日：2001-07-11

申请人： Seiichi Kohara ,  Shinji Kidowaki ,  Tsutomu Harada

发明人： Seiichi Kohara ,  Shinji Kidowaki ,  Tsutomu Harada

IPC分类号： B22F312

CPC分类号： B22F3/03 ,  B22F2003/023 ,  B22F2009/041 ,  B22F2998/00 ,  B22F2998/10 ,  B22F2999/00 ,  B30B11/04 ,  H01F1/0577 ,  H01F41/0273 ,  C22C1/0441 ,  B22F9/023 ,  B22F9/04 ,  B22F3/02 ,  B22F2202/05

摘要： A powder pressing apparatus comprises a die formed with a plurality of cavities. None of the cavities overlap with another in the direction of pushing the compacts. The magnetic field generator includes a pair of yokes sandwiching the die. The yokes and the die have their respective upper surfaces generally in a same plane. A die lubricant is applied to the die but not to a region on which the compacts are to be slid. A rare-earth alloy powder in a feeder box is supplied into each of the cavities. The powder in the cavities is oriented, pressed, and the formed compacts and the yokes are demagnetized. The compacts are pushed and slid off the die on an anti-wear layer, by a flexible pushing member provided in a front portion of the feeder box. The compacts are sintered into rare-earth magnets, which are suitable for a coreless motor.

公开(公告)号：US06481993B1

公开(公告)日：2002-11-19

申请号：US09669576

申请日：2000-09-26

申请人： Seiichi Kohara ,  Shuhei Okumura ,  Akira Nakamura

发明人： Seiichi Kohara ,  Shuhei Okumura ,  Akira Nakamura

IPC分类号： B65G4774

CPC分类号： B30B15/304 ,  B22F3/004 ,  B22F2999/00 ,  H01F1/0571 ,  H01F1/0577 ,  H01F1/06 ,  H01F41/0253 ,  H01F41/0266 ,  B22F2201/10

摘要： In a rare earth metal-based alloy powder supplying apparatus, a rare earth metal-based alloy powder is supplied from a feeder box having an opening in its bottom surface into a cavity by moving the feeder box to above the cavity. The apparatus includes a bar-shaped member which is moved horizontally and in parallel in the bottom of the feeder box. A plurality of the bar-shaped members may be provided horizontally at distances. The apparatus further includes a powder replenishing device for sequentially replenishing the alloy powder into the feeder box in an amount corresponding to a decrement in amount resulting from the supplying of the alloy powder from the feeder box to the cavity, an inert gas supply device for filling an inert gas into said powder feeder box, and a plate member made of a fluorine-contained resin and mounted on the bottom surface of the feeder box. Thus, an alloy powder extremely poor in fluidity and in agitatability and liable to be inflamed can be supplied into the cavity with an extremely uniform filled density without production of agglomerates and bridges and with no fear of inflammation.

公开(公告)号：US06332932B1

公开(公告)日：2001-12-25

申请号：US09551392

申请日：2000-04-18

申请人： Seiichi Kohara ,  Shinji Kidowaki

发明人： Seiichi Kohara ,  Shinji Kidowaki

IPC分类号： H01F1053

CPC分类号： B30B15/34 ,  B22F3/03 ,  B22F2003/023 ,  B22F2998/00 ,  B30B11/02 ,  B30B15/065 ,  H01F41/0273 ,  H02K15/03 ,  H02K41/0358 ,  Y10T428/12014 ,  B22F2202/05

摘要： A powder pressing apparatus comprises a die having a through hole, an upper punch and a lower punch. At least one of the upper and lower punches has a punching surface having an edge portion provided with a projection. The projection has a tip chamfered by a width not greater than 0.5 mm. The punching surface has a slope having a surface roughness Ra not greater than 1.0 &mgr;m. A rare-earth alloy powder is fed into a cavity formed in the through hole of the die. The rare-earth alloy powder in the cavity is oriented by magnetic field, and pressed by using the upper and lower punches. The upper punch and the lower punch are brought closest to each other at a minimum distance not smaller than 1.7 mm during the pressing. An obtained compact is used for manufacture of a sintered body and a voice coil motor.

摘要翻译： 粉末压制装置包括具有通孔的模具，上冲头和下冲头。 上冲头和下冲头中的至少一个具有冲压表面，该冲压表面具有设有突出部的边缘部分。 突起具有倒角宽度不大于0.5mm的尖端。 冲压表面具有表面粗糙度Ra不大于1.0μm的斜面。 将稀土合金粉末供给到形成在模具的通孔中的空腔中。 空腔中的稀土合金粉末通过磁场取向，并使用上下冲头压制。 上冲头和下冲头在压制过程中以不小于1.7mm的最小距离彼此最接近。 所获得的压块用于烧结体和音圈电动机的制造。

公开(公告)号：US06779995B2

公开(公告)日：2004-08-24

申请号：US10212091

申请日：2002-08-06

申请人： Seiichi Kohara ,  Shuhei Okumura ,  Akira Nakamura

发明人： Seiichi Kohara ,  Shuhei Okumura ,  Akira Nakamura

IPC分类号： B22F302

CPC分类号： B30B15/304 ,  B22F3/004 ,  B22F2999/00 ,  H01F1/0571 ,  H01F1/0577 ,  H01F1/06 ,  H01F41/0253 ,  H01F41/0266 ,  B22F2201/10

摘要： In a rare earth metal-based alloy powder supplying apparatus, a rare earth metal-based alloy powder is supplied from a feeder box having an opening in its bottom surface into a cavity by moving the feeder box to above the cavity. The apparatus includes a bar-shaped member which is moved horizontally and in parallel in the bottom of the feeder box. A plurality of the bar-shaped members may be provided horizontally at distances. The apparatus further includes a powder replenishing device for sequentially replenishing the alloy powder into the feeder box in an amount corresponding to a decrement in amount resulting from the supplying of the alloy powder from the feeder box to the cavity, an inert gas supply device for filling an inert gas into said powder feeder box, and a plate member made of a fluorine-contained resin and mounted on the bottom surface of the feeder box. Thus, an alloy powder extremely poor in fluidity and in agitatability and liable to be inflamed can be supplied into the cavity with an extremely uniform filled density without production of agglomerates and bridges and with no fear of inflammation.

摘要翻译： 在稀土类金属基合金粉末供给装置中，通过将供料盒移动到空腔的上方，从其底面开口的供料箱向空腔供给稀土类金属系合金粉末。 该装置包括在进料盒的底部水平移动并平行移动的棒状构件。 多个条形构件可以在距离处水平设置。 该装置还包括粉末补给装置，用于将合金粉末顺序地补充到进料箱中，其量相当于从供料盒向腔体供应合金粉末所产生的量减少;惰性气体供应装置，用于填充 将惰性气体输送到所述粉末给料盒中，以及由含氟树脂制成的板件，并安装在所述进料盒的底表面上。 因此，可以以非常均匀的填充密度将流动性和搅拌性极差且容易发炎的合金粉末供给到空腔中，而不产生附聚物和桥梁，并且不用担心发炎。

公开(公告)号：US06656417B2

公开(公告)日：2003-12-02

申请号：US09883231

申请日：2001-06-19

申请人： Seiichi Kohara ,  Shinji Kidowaki

发明人： Seiichi Kohara ,  Shinji Kidowaki

IPC分类号： B22F302

CPC分类号： B30B15/34 ,  B22F3/03 ,  B22F2003/023 ,  B22F2998/00 ,  B30B11/02 ,  B30B15/065 ,  H01F41/0273 ,  H02K15/03 ,  H02K41/0358 ,  Y10T428/12014 ,  B22F2202/05

摘要： A powder pressing apparatus comprises a die having a through hole, an upper punch and a lower punch. At least one of the upper and lower punches has a punching surface having an edge portion provided with a projection. The projection has a tip chamfered by a width not greater than 0.5 mm. The punching surface has a slope having a surface roughness Ra not greater than 1.0 &mgr;m. A rare-earth alloy powder is fed into a cavity formed in the through hole of the die. The rare-earth alloy powder in the cavity is oriented by magnetic field, and pressed by using the upper and lower punches. The upper punch and the lower punch are brought closest to each other at a minimum distance not smaller than 1.7 mm during the pressing. An obtained compact is used for manufacture of a sintered body and a voice coil motor.

公开(公告)号：US06299832B1

公开(公告)日：2001-10-09

申请号：US09472247

申请日：1999-12-27

申请人： Seiichi Kohara ,  Shuhei Okumura ,  Akira Nakamura

发明人： Seiichi Kohara ,  Shuhei Okumura ,  Akira Nakamura

IPC分类号： B22F312

CPC分类号： B30B15/304 ,  B22F3/004 ,  B22F2999/00 ,  H01F1/0571 ,  H01F1/0577 ,  H01F1/06 ,  H01F41/0253 ,  H01F41/0266 ,  B22F2201/10

摘要： In a rare earth metal-based alloy powder supplying apparatus, a rare earth metal-based alloy powder is supplied from a feeder box having an opening in its bottom surface into a cavity by moving the feeder box to above the cavity. The apparatus includes a bar-shaped member which is moved horizontally and in parallel in the bottom of the feeder box. A plurality of the bar-shaped members may be provided horizontally at distances. The apparatus further includes a powder replenishing device for sequentially replenishing the alloy powder into the feeder box in an amount corresponding to a decrement in amount resulting from the supplying of the alloy powder from the feeder box to the cavity, an inert gas supply device for filling an inert gas into said powder feeder box, and a plate member made of a fluorine-contained resin and mounted on the bottom surface of the feeder box. Thus, an alloy powder extremely poor in fluidity and in agitatability and liable to be inflamed can be supplied into the cavity with an extremely uniform filled density without production of agglomerates and bridges and with no fear of inflammation.

摘要翻译： 在稀土类金属基合金粉末供给装置中，通过将供料盒移动到空腔的上方，从其底面开口的供料箱向空腔供给稀土类金属系合金粉末。 该装置包括在进料盒的底部水平移动并平行移动的棒状构件。 多个条形构件可以在距离处水平设置。 该装置还包括粉末补给装置，用于将合金粉末顺序地补充到进料箱中，其量相当于从供料盒向腔体供应合金粉末所产生的量减少;惰性气体供应装置，用于填充 将惰性气体输送到所述粉末给料盒中，以及由含氟树脂制成的板件，并安装在所述进料盒的底表面上。 因此，可以以非常均匀的填充密度将流动性和搅拌性极差且容易发炎的合金粉末供给到空腔中，而不产生附聚物和桥梁，并且不用担心发炎。

公开(公告)号：US06755883B2

公开(公告)日：2004-06-29

申请号：US10225135

申请日：2002-08-22

申请人： Seiichi Kohara ,  Shinji Kidowaki

发明人： Seiichi Kohara ,  Shinji Kidowaki

IPC分类号： B22F300

CPC分类号： B30B15/34 ,  B22F3/03 ,  B22F2003/023 ,  B22F2998/00 ,  B30B11/02 ,  B30B15/065 ,  H01F41/0273 ,  H02K15/03 ,  H02K41/0358 ,  Y10T428/12014 ,  B22F2202/05

摘要： A powder pressing apparatus comprises a die having a through hole, an upper punch and a lower punch. At least one of the upper and lower punches has a punching surface having an edge portion provided with a projection. The projection has a tip chamfered by a width not greater than 0.5 mm. The punching surface has a slope having a surface roughness Ra not greater than 1.0 &mgr;m. A rare-earth alloy powder is fed into a cavity formed in the through hole of the die. The rare-earth alloy powder in the cavity is oriented by magnetic field, and pressed by using the upper and lower punches. The upper punch and the lower punch are brought closest to each other at a minimum distance not smaller than 1.7 mm during the pressing. An obtained compact is used for manufacture of a sintered body and a voice coil motor.

摘要翻译： 粉末压制装置包括具有通孔的模具，上冲头和下冲头。 上冲头和下冲头中的至少一个具有冲压表面，该冲压表面具有设有突出部的边缘部分。 突起具有倒角宽度不大于0.5mm的尖端。 冲压表面具有表面粗糙度Ra不大于1.0μm的斜面。 将稀土合金粉末供给到形成在模具的通孔中的空腔中。 空腔中的稀土合金粉末通过磁场取向，并使用上下冲头压制。 上冲头和下冲头在压制过程中以不小于1.7mm的最小距离彼此最接近。 所获得的压块用于烧结体和音圈电动机的制造。

公开(公告)号：US5662943A

公开(公告)日：1997-09-02

申请号：US641772

申请日：1996-04-30

申请人： Osamu Yamashita ,  Tsunekazu Saigo ,  Seiichi Kohara ,  Hirokazu Kitayama ,  Hiroshi Hashikawa

发明人： Osamu Yamashita ,  Tsunekazu Saigo ,  Seiichi Kohara ,  Hirokazu Kitayama ,  Hiroshi Hashikawa

IPC分类号： B22F1/00 ,  B28B1/00 ,  H01F1/055 ,  H01F1/057

CPC分类号： H01F1/0577 ,  B22F1/0096 ,  H01F1/0551 ,  H01F1/0571 ,  B22F2999/00

摘要： The purpose of this invention is to present fabrication methods and equipment for granulated powders whereby, the reaction between the R--Fe--B-type or R--Co-type rare earth containing alloy powders and the binder is controlled, the residual oxygen and carbon content of the sintered products after sintering is reduced, and whereby it is possible to obtain isotropic or anisotropic granulated powders having good powder flowability and lubrication properties when molding. After stirring a slurry of rare earth containing alloy powders formed by adding a binder consisting of water and at least one of either methyl cellulose, polyacryl amide or polyvinyl alcohol, and mixing, oriented liquid droplets are formed by applying a magnetic field to the slurry to orientate the said powder particles and spraying within the chamber of a spray dryer apparatus. By instantaneously dry solidifying these anisotropic granulated powders, it is possible to fabricate spherical granulated powders with good magnetic properties and a high flowability whereby the flowability and lubrication properties of the powder at the time of compression molding are improved, as well as improving the molding cycle and the dimensional precision of the molded product.

摘要翻译： 本发明的目的是提供造粒粉末的制造方法和设备，由此控制R-Fe-B型或R-Co型稀土合金粉末与粘合剂之间的反应，残余氧和碳 烧结后的烧结体的含量降低，由此可以获得成型时具有良好的粉末流动性和润滑性的各向同性或各向异性的造粒粉末。 在搅拌通过添加由水组成的粘合剂和甲基纤维素，聚丙烯酰胺或聚乙烯醇中的至少一种形成的粘合剂粉末和混合取向液滴形成浆料后，通过向浆料施加磁场而形成 使所述粉末颗粒定向并在喷雾干燥设备的室内喷雾。 通过瞬时干燥固化这些各向异性粒状粉末，可以制造具有良好磁性能和高流动性的球形颗粒粉末，从而提高压缩模制时粉末的流动性和润滑性能，以及改善成型周期 和模制产品的尺寸精度。

公开(公告)号：US5575830A

公开(公告)日：1996-11-19

申请号：US360632

申请日：1994-12-21

申请人： Osamu Yamashita ,  Tsunekazu Saigo ,  Seiichi Kohara ,  Hirokazu Kitayama ,  Hiroshi Hashikawa

发明人： Osamu Yamashita ,  Tsunekazu Saigo ,  Seiichi Kohara ,  Hirokazu Kitayama ,  Hiroshi Hashikawa

IPC分类号： B22F1/00

CPC分类号： B22F9/026 ,  H01F1/0577 ,  H01F41/0266 ,  B22F2998/10 ,  B22F2999/00 ,  H01F1/0572

摘要： The purpose of this invention is to present fabrication methods and equipment for granulated powders whereby, the reaction between the R-Fe-B-type or R-Co-type rare earth containing alloy powders and the binder is controlled, the residual oxygen and carbon content of the sintered products after sintering is reduced, and whereby it is possible to obtain isotropic or anisotropic granulated powders having good powder flowability and lubrication properties when molding. After stirring a slurry of rare earth containing alloy powders formed by adding a binder consisting of water and at least one of either methyl cellulose, polyacryl amide or polyvinyl alcohol, and mixing, oriented liquid droplets are formed by applying a magnetic field to the slurry to orientate the said powder particles and spraying within the chamber of a spray dryer apparatus. By instantaneously dry solidifying these anisotropic granulated powders, it is possible to fabricate spherical granulated powders with good magnetic properties and a high flowability whereby the flowability and lubrication properties of the powder at the time of compression molding are improved, as well as improving the molding cycle and the dimensional precision of the molded product.

摘要翻译： 本发明的目的是提供造粒粉末的制造方法和设备，由此控制R-Fe-B型或R-Co型稀土合金粉末与粘合剂之间的反应，残余氧和碳 烧结后的烧结体的含量降低，由此可以获得成型时具有良好的粉末流动性和润滑性的各向同性或各向异性的造粒粉末。 在搅拌通过添加由水组成的粘合剂和甲基纤维素，聚丙烯酰胺或聚乙烯醇中的至少一种形成的粘合剂粉末和混合取向液滴形成浆料后，通过向浆料施加磁场而形成 使所述粉末颗粒定向并在喷雾干燥设备的室内喷雾。 通过瞬时干燥固化这些各向异性粒状粉末，可以制造具有良好磁性能和高流动性的球形颗粒粉末，从而提高压缩模制时粉末的流动性和润滑性能，以及改善成型周期 和模制产品的尺寸精度。