Patents by Inventor Yasuo Maruki
Yasuo Maruki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10226801Abstract: The present invention is a casting product reduction apparatus that applies reduction to a casting product drawn from a mold with a sufficient reduction force and thereby can surely decrease center segregation and porosity and suppress occurrence of internal cracks so as to manufacture a high-quality casting product and includes: a pair of casting product press rolls that hold and press the casting product therebetween; backup rolls that support the casting product press rolls; and a pair of frames arranged to face each other, wherein three or more sets of the casting product press roll and the backup roll are arranged in a casting product drawing direction on each of the frames, and wherein a reduction means that decreases and increases a distance between the frames is provided at two or more places on the pair of frames.Type: GrantFiled: January 15, 2013Date of Patent: March 12, 2019Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Shuntaro Imai, Yasuo Maruki, Norimasa Yamasaki, Yukihiro Matsuoka, Satoshi Senoo, Masanobu Hayama
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Patent number: 9782824Abstract: Continuous casting equipment includes a casting product reduction apparatus and a casting product drawing apparatus, the casting product reduction apparatus including a pair of casting product reduction rolls that sandwich and apply pressure to a casting product and being configured to apply reduction to the casting product, the casting product drawing apparatus being provided in a following stage of the casting product reduction apparatus and configured to sandwich and draw the casting product with a pair of casting product drawing rolls. At least one of the pair of casting product reduction rolls includes a large-diameter part that projects radially outward in an axial-direction center region and applies pressure to a width-direction center region of the casting product. The casting product that is subjected to reduction by the casting product reduction apparatus has a depressed part corresponding to the large-diameter part.Type: GrantFiled: April 28, 2014Date of Patent: October 10, 2017Assignee: NIPPON STEEL AND SUMITOMO METAL CORPORATIONInventors: Shuntaro Imai, Yasuo Maruki, Daisuke Miki, Hiroaki Uchiyama
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Publication number: 20150367408Abstract: Continuous casting equipment includes a casting product reduction apparatus and a casting product drawing apparatus, the casting product reduction apparatus including a pair of casting product reduction rolls that sandwich and apply pressure to a casting product and being configured to apply reduction to the casting product, the casting product drawing apparatus being provided in a following stage of the casting product reduction apparatus and configured to sandwich and draw the casting product with a pair of casting product drawing rolls. At least one of the pair of casting product reduction rolls includes a large-diameter part that projects radially outward in an axial-direction center region and applies pressure to a width-direction center region of the casting product. The casting product that is subjected to reduction by the casting product reduction apparatus has a depressed part corresponding to the large-diameter part.Type: ApplicationFiled: April 28, 2014Publication date: December 24, 2015Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Shuntaro IMAI, Yasuo MARUKI, Daisuke MIKI, Hiroaki UCHIYAMA
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Publication number: 20150047403Abstract: The present invention is a casting product reduction apparatus that applies reduction to a casting product drawn from a mold with a sufficient reduction force and thereby can surely decrease center segregation and porosity and suppress occurrence of internal cracks so as to manufacture a high-quality casting product and includes: a pair of casting product press rolls that hold and press the casting product therebetween; backup rolls that support the casting product press rolls; and a pair of frames arranged to face each other, wherein three or more sets of the casting product press roll and the backup roll are arranged in a casting product drawing direction on each of the frames, and wherein a reduction means that decreases and increases a distance between the frames is provided at two or more places on the pair of frames.Type: ApplicationFiled: January 15, 2013Publication date: February 19, 2015Inventors: Shuntaro Imai, Yasuo Maruki, Norimasa Yamasaki, Yukihiro Matsuoka, Satoshi Senoo, Masanobu Hayama
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Publication number: 20140190655Abstract: A continuous casting apparatus for steel includes: a casting mold for casting a molten steel with a pair of long side walls and a pair of short side walls; a submerged entry nozzle which discharges the molten steel into the casting mold; and an electromagnetic stirring device which is disposed along each external surface of each of the long side walls and stirs an upper portion of the molten steel within the casting mold. A curved portion which is convexly curved toward the electromagnetic stirring device in plan view is formed at least at a position where the curved portion faces the submerged entry nozzle on each of the long side walls, and each of the long side walls including the curved portion has a uniform thickness.Type: ApplicationFiled: November 9, 2011Publication date: July 10, 2014Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Takehiko Toh, Junji Nakashima, Yasuo Maruki, Norimasa Yamasaki, Keiji Tsunenari, Kenji Umetsu
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Patent number: 7159641Abstract: A cooling drum for metal cast strip by continuous casting has dimples 40 to 200 ?m in average depth and 0.5 to 3 mm in diameter of circle equivalent formed on a plated peripheral surface of the cooling drum, adjacent to each other at rims of the dimples; and a film, containing oxides of at least one member selected from the group consisting of Ni—W, Ni—Co—W, Cr, Ni—Fe and Ni—Al, is formed on the peripheral surface.Type: GrantFiled: January 26, 2005Date of Patent: January 9, 2007Assignee: Nippon Steel CorporationInventors: Hideaki Yamamura, Naoya Hamada, Tadahiro Izu, Yasushi Kurisu, Isao Suichi, Masafumi Miyazaki, Kazumi Seki, Eiichi Takeuchi, Mamoru Yamada, Hideki Oka, Yasuo Maruki, Eiichiro Ishimaru, Mitsuru Nakayama
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Publication number: 20050126742Abstract: Dimples, preferably 40 to 200 ?m in average depth and 0.5 to 3 mm in diameter of circle equivalent, are formed on the peripheral surface of a cooling drum, adjacent to each other at the rims of the dimples; and fine humps (preferably, fine humps 1 to 50 ?m in height and 5 to 200 ?m in diameter of circle equivalent on the surfaces of the dimples and/or fine humps 1 to 50 ?m in height and 30 to 200 ?m in diameter of circle equivalent at the rims of the dimples), fine holes (preferably, fine holes 5 ?m or more in depth and 10 to 200 ?m in diameter of circle equivalent), or fine unevenness (preferably, fine unevenness 1 to 50 ?m in average depth and 10 to 200 ?m in diameter of circle equivalent) are formed at the rims and/or on the indented surfaces of said dimples.Type: ApplicationFiled: January 26, 2005Publication date: June 16, 2005Applicant: Nippon Steel CorporationInventors: Hideaki Yamamura, Naoya Hamada, Tadahiro Izu, Yasushi Kurisu, Isao Suichi, Masafumi Miyazaki, Kazumi Seki, Eiichi Takeuchi, Mamoru Yamada, Hideki Oka, Yasuo Maruki, Eiichiro Ishimaru, Mitsuru Nakayama
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Patent number: 6896033Abstract: Dimples, preferably 40 to 200 ?m in average depth and 0.5 to 3 mm in diameter of circle equivalent, are formed on the peripheral surface of a cooling drum, adjacent to each other at the rims of the dimples; and fine humps (preferably, fine humps 1 to 50 ?m in height and 5 to 200 ?m in diameter of circle equivalent on the surfaces of the dimples and/or fine humps 1 to 50 ?m in height and 30 to 200 ?m in diameter of circle equivalent at the rims of the dimples), fine holes (preferably, fine holes 5 ?m or more in depth and 10 to 200 ?m in diameter of circle equivalent), or fine unevenness (preferably, fine unevenness 1 to 50 ?m in average depth and 10 to 200 ?m in diameter of circle equivalent) are formed at the rims and/or on the indented surfaces of said dimples.Type: GrantFiled: May 11, 2001Date of Patent: May 24, 2005Assignee: Nippon Steel CorporationInventors: Hideaki Yamamura, Naoya Hamada, Tadahiro Izu, Yasushi Kurisu, Isao Suichi, Masafumi Miyazaki, Kazumi Seki, Eiichi Takeuchi, Mamoru Yamada, Hideki Oka, Yasuo Maruki, Eiichiro Ishimaru, Mitsuru Nakayama
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Publication number: 20020166653Abstract: Dimples, preferably 40 to 200 &mgr;m in average depth and 0.5 to 3 mm in diameter of circle equivalent, are formed on the peripheral surface of a cooling drum, adjacent to each other at the rims of the dimples; and fine humps (preferably, fine humps 1 to 50 &mgr;m in height and 5 to 200 &mgr;m in diameter of circle equivalent on the surfaces of the dimples and/or fine humps 1 to 50 &mgr;m in height and 30 to 200 &mgr;m in diameter of circle equivalent at the rims of the dimples), fine holes (preferably, fine holes 5 &mgr;m or more in depth and 10 to 200 &mgr;m in diameter of circle equivalent), or fine unevenness (preferably, fine unevenness 1 to 50 &mgr;m in average depth and 10 to 200 &mgr;m in diameter of circle equivalent) are formed at the rims and/or on the indented surfaces of said dimples.Type: ApplicationFiled: January 11, 2002Publication date: November 14, 2002Inventors: Hideaki Yamamura, Naoya Hamada, Tadahiro Izu, Yasushi Kurisu, Isao Suichi, Masafumi Miyazaki, Kazumi Seki, Eiichi Takeuchi, Mamoru Yamada, Hideki Oka, Yasuo Maruki, Eiichiro Ishimaru, Mitsuru Nakayama