Patents by Inventor Yutaka Neishi
Yutaka Neishi 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: 10047797Abstract: A bearing constituent member includes a base material including steel and a carbonitrided layer that is a surface layer on the steel, the steel including 0.3 to 0.45 mass % of carbon, 0.5 mass % or lower of silicon, 0.4 to 1.5 mass % of manganese, 0.3 to 2 mass % of chromium, 0.1 to 0.35 mass % of molybdenum, 0.2 to 0.4 mass % of vanadium, and a remainder of iron and unavoidable impurities. Surface Vickers hardness at a position at a depth of 50 ?m from a surface of a rolling sliding surface is 700 to 800, internal hardness is 550 to 690 in terms of Vickers hardness, and an amount of residual austenite in a range from the surface to a depth of 10 ?m is at least 30 vol %.Type: GrantFiled: December 1, 2016Date of Patent: August 14, 2018Assignees: JTEKT CORPORATION, NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Takashi Sada, Kohei Kanetani, Takahiro Shimano, Tetsuya Hironaka, Yutaka Neishi, Tomohiro Yamashita
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Patent number: 9994943Abstract: Rolled steel bar for hot forging consisting, by mass percent, of C: 0.25-0.50%, Si: 0.40-1.0%, Mn: 1.0-1.6%, S: 0.005-0.035%, Al: 0.005-0.050%, V: 0.10-0.30%, N: 0.005-0.030% with the balance being Fe and impurities, i.e., P: 0.035% or less and O: 0.0030% or less, wherein Fn1=C+Si/10+Mn/5+5Cr/22+1.65V?5S/7 is 0.90 to 1.20. The predicted maximum width of nonmetallic inclusions at the time when a cumulative distribution function obtained by extreme value statistical processing by taking the width of nonmetallic inclusion in an R1/2 part of a longitudinal cross section of the steel bar as W (mm) is 99.99% is 100 ?m or narrower. The number density of sulfides each having a circle-equivalent diameter of 0.3 to 1.0 ?m observed per unit area of the R1/2 part of a transverse cross section of the steel bar is 500 pieces/mm2 or higher.Type: GrantFiled: July 11, 2017Date of Patent: June 12, 2018Assignees: NIPPON STEEL & SUMITOMO METAL CORPORATION, DENSO CORPORATIONInventors: Naoki Matsui, Masashi Higashida, Hitoshi Matsumoto, Yutaka Neishi, Taizo Makino, Kouji Morita, Yoshihiro Tanimura, Naoyuki Sashima, Toshimasa Itou
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Patent number: 9976206Abstract: A rolled round steel material contains C: 0.38 to 0.55%, Si: 1.0% or less, Mn: 0.20 to 2.0%, S: 0.005 to 0.10%, Cr: 0.01 to 2.0%, Al: 0.003 to 0.10%, B: 0.0005 to 0.0030%, Ti: 0.047% or less, Cu: 0 to 1.0%, Ni: 0 to 3.0%, Mo: 0 to 0.50%, Nb: 0 to 0.10%, V: 0 to 0.30%, Ca: 0 to 0.005%, and Pb: 0 to 0.30%, a remaining portion being constituted by Fe and an impurities, the impurities containing P in an amount of 0.030% or less and N in an amount of 0.008% or less, and has a chemical composition satisfying [3.4N?Ti?3.4N+0.02]. The microstructure is constituted by ferrite (F), lamellar pearlite (LP), and cementite (C) and microstructural features vary in terms of the lateral, longitudinal and central portions of the steel. This steel material has a high base material toughness and good machinability without performing thermal refining.Type: GrantFiled: June 18, 2014Date of Patent: May 22, 2018Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Makoto Egashira, Sadanori Horikami, Masashi Higashida, Takahiro Okada, Yutaka Neishi, Tatsuya Hasegawa, Hitoshi Matsumoto
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Patent number: 9951403Abstract: A rolled steel bar for hot forging consisting, by mass percent, of C: 0.25-0.50%, Si: 0.40-1.0%, Mn: 1.0-1.6%, S: 0.005-0.035%, Al: 0.005-0.050%, V: 0.10-0.30%, and N: 0.005-0.030%, and the balance of Fe and impurities, i.e., P: 0.035% or less and O: 0.0030% or less, wherein Fn1=C+Si/10+Mn/5+5Cr/22+1.65V?5S/7 is 0.90 to 1.20. The predicted maximum width of nonmetallic inclusions at the time when a cumulative distribution function obtained by extreme value statistical processing by taking the width of nonmetallic inclusion in an R1/2 part of a longitudinal cross section of the steel bar as W (?m) is 99.99% is 100 ?m or narrower. The number density of sulfides each having a circle-equivalent diameter of 0.3 to 1.0 ?m observed per unit area of the R1/2 part of a transverse cross section of the steel bar is 500 pieces/mm2 or higher.Type: GrantFiled: February 5, 2013Date of Patent: April 24, 2018Assignees: NIPPON STEEL & SUMITOMO METAL CORPORATION, DENSO CORPORATIONInventors: Naoki Matsui, Masashi Higashida, Hitoshi Matsumoto, Yutaka Neishi, Taizo Makino, Kouji Morita, Yoshihiro Tanimura, Naoyuki Sashima, Toshimasa Itou
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Publication number: 20180073618Abstract: A gear keeping the bending stress at the dedendum from becoming locally high at the time of power transmission and thereby raising the dedendum bending strength is provided. The radius of curvature is maximum at a critical section position determined by the Hofer's 30° tangent method. Both of the radii of curvature from the critical section position to the first and second connecting points X1 and Y1 are constant or decreasing. In the dedendum line segment 23, there are the points A1 and B1 where the radius of curvature is smaller than the critical section position. In the dedendum line segment 23, the maximum radius of curvature is 3 times or less the minimum radius of curvature. By a cross-sectional view, the critical section position is part of an arc, and the arc extends to the two sides of the critical section position. Due to this, the maximum bending stress becomes smaller and improvement of the dedendum bending strength can be realized.Type: ApplicationFiled: March 29, 2016Publication date: March 15, 2018Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Hiroki NARUMIYA, Osamu KADA, Takashi FUJITA, Yutaka NEISHI
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Publication number: 20180073111Abstract: A cold forged part having a high cold forgeability and having a high endurance ratio due to work hardening by cold forging and age-hardening after cold forging, characterized by having a predetermined chemical composition, having an amount of solute Nb/amount of solute V of 0.03 or more and having a structure, by area ratio, of ferrite of 85% or more and a total of bainite and martensite of 5% or less.Type: ApplicationFiled: March 30, 2016Publication date: March 15, 2018Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Tomohiro YAMASHITA, Yutaka NEISHI, Hitoshi MATSUMOTO, Makoto EGASHIRA
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Publication number: 20180057917Abstract: A rolled steel bar for hot forging consisting, by mass percent, of C: 0.25-0.50%, Si: 0.40-1.0%, Mn: 1.0-1.6%, S: 0.005-0.035%, Al: 0.005-0.050%, V: 0.10-0.30%, and N: 0.005-0.030%, and the balance of Fe and impurities, i.e., P: 0.035% or less and O: 0.0030% or less, wherein Fn1=C+Si/10+Mn/5+5Cr/22+1.65V?5S/7 is 0.90 to 1.20. The predicted maximum width of nonmetallic inclusions at the time when a cumulative distribution function obtained by extreme value statistical processing by taking the width of nonmetallic inclusion in an R1/2 part of a longitudinal cross section of the steel bar as W (mm) is 99.99% is 100 mm or narrower. The number density of sulfides each having a circle-equivalent diameter of 0.3 to 1.0 mm observed per unit area of the R1/2 part of a transverse cross section of the steel bar is 500 pieces/mm2 or higher.Type: ApplicationFiled: July 11, 2017Publication date: March 1, 2018Inventors: Naoki MATSUI, Masashi HIGASHIDA, Hitoshi MATSUMOTO, Yutaka NEISHI, Taizo MAKINO, Kouji MORITA, Yoshihiro TANIMURA, Naoyuki SASHIMA, Toshimasa ITOU
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Publication number: 20180044757Abstract: Age hardening steel excellent in machinability before aging treatment and excellent in fatigue characteristics, toughness, and low cycle fatigue characteristics after aging treatment, that is, age hardening steel containing predetermined amounts of C, Si, Mn, S, Cr, Al, V, Nb, Ca, and REM, limiting contents of P, Ti, and N to predetermined amounts or less, having a balance of Fe and impurities, having an area ratio of bainite structures of 70% or more, and, furthermore, having a chemical composition where F1 expressed by C+0.3×Mn+0.25×Cr is 0.68 or more, F2 expressed by C+0.1×Si+0.2×Mn+0.15×Cr+0.35×V is 0.85 or less, F3 expressed by ?4.5×C+Mn+Cr?3.5×V is 0.00 or more, and F4 expressed by 10×Ca+REM is 0.012 to 0.08, is provided. Note that, the symbols of elements in the formulas showing F1 to F4 mean the contents by mass % of those elements.Type: ApplicationFiled: March 17, 2016Publication date: February 15, 2018Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Yutaka NEISHI, Masato YUYA, Tatsuya HASEGAWA, Motoki TAKASUGA, Masashi HIGASHIDA, Hitoshi MATSUMOTO, Taizo MAKINO
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Publication number: 20180031040Abstract: A ball bearing not allowing locations where the surface pressure becomes locally higher at a race at the time of a high load and thereby keeping cracking from occurring and in turn realizing a longer lifespan is provided. A pair of races (12, 14) and at least one rolling element (16) movably clamped between the pair of races move are provided. A cross-sectional profile line (14a) of a part of each of the pair of races contacting the rolling element has the smallest radius of curvature at a position (P) sticking out the most in the first direction (D1) over which the pair of races face. The cross-sectional profile line becomes larger in radius of curvature the further from the position (P) in a second direction (D2) vertical to the first direction (D1) in the cross-section. The cross-sectional profile line is comprised of a single function.Type: ApplicationFiled: March 2, 2016Publication date: February 1, 2018Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Takashi FUJITA, Yutaka NEISHI, Hiroki NARUMIYA
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Patent number: 9840759Abstract: A rolled round steel material for a steering rack bar, having a chemical composition consisting of C: 0.38 to 0.55%, Si: not more than 1.0%, Mn: 0.20 to 2.0%, S: 0.005 to 0.10%, Cr: 0.01 to 2.0%, Al: 0.003 to 0.10%, and N: 0.003 to 0.03%, with the balance being Fe and impurities, and P being not more than 0.030% in the impurities, and a microstructure consisting of ferrite (F), lamellar pearlite (LP), and cementite (C). The average grain diameter of (F), an area fraction of (LP), and the number of particles of spheroidal cementite (SC) among C are controlled in a region from the surface to a position at ½ radius and in a central part of the material. An average aspect ratio of F is controlled in a region from a surface to a position at ½ radius.Type: GrantFiled: February 10, 2014Date of Patent: December 12, 2017Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Sadanori Horikami, Masashi Higashida, Takahiro Okada, Makoto Egashira, Yutaka Neishi, Tatsuya Hasegawa, Hitoshi Matsumoto
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Publication number: 20170335426Abstract: In a rolled steel bar or rolled wire rod for a cold-forged component having a predetermined chemical composition, Y1 represented by Y1=[Mn]×[Cr] and Y2 represented by Y2=0.134×(D/25.4?(0.50×?[C]))/(0.50×?[C]) satisfy Y1>Y2, the tensile strength is 750 MPa or less, an internal structure is a ferrite-pearlite structure, and the ferrite fraction in the internal structure is 40% or greater. AMOUNT IS 0.Type: ApplicationFiled: November 13, 2015Publication date: November 23, 2017Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Naoki MATSUI, Yutaka NEISHI, Tetsushi CHIDA, Akihisa OBATA, Shoji HORI, Keisuke CHIBA
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Publication number: 20170314107Abstract: In a rolled steel bar or rolled wire rod for a cold-forged component having a predetermined chemical composition, Y1 represented by Y1=[Mn]×[Cr] and Y2 represented by Y2=0.134×(D/25.4?(0.50×?[C])/(0.50×?[C]) satisfy Y1>Y2, the tensile strength is 750 MPa or less, an internal structure is a ferrite-pearlite structure, and the ferrite fraction in the internal structure is 40% or greater.Type: ApplicationFiled: November 13, 2015Publication date: November 2, 2017Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Naoki MATSUI, Yutaka NEISHI, Tetsushi CHIDA, Akihisa OBATA, Shoji HORI, Keisuke CHIBA
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Publication number: 20170218489Abstract: Provided is a steel for carbonitrided bearing which excels in hardenability and also excels in toughness, wear resistance, and surface-originated flaking life after quenching and tempering. A steel for carbonitrided bearing of the present embodiment has a chemical composition containing, in mass %, C: 0.22 to 0.45%, Si: not more than 0.50%, Mn: 0.40 to 1.50%, P: not more than 0.015%, S: not more than 0.005%, Cr: 0.30 to 2.0%, Mo: 0.10 to 0.35%, V: 0.20 to 0.40%, Al: 0.005 to 0.10%, N: not more than 0.030%, and O: not more than 0.0015%, with the balance being Fe and impurities, and satisfying Formulae (1) and (2). 1.20<0.4Cr+0.4Mo+4.5V<2.60??(1) 2.7C+0.4Si+Mn+0.8Cr+Mo+V>2.Type: ApplicationFiled: July 29, 2015Publication date: August 3, 2017Inventors: Yutaka NEISHI, Takahisa SUZUKI, Tatsuya KOYAMA, Shingo YAMASAKI, Kohei KANETANI, Takashi SADA
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Publication number: 20170211170Abstract: Provided is a carbonitrided bearing part which has high hardenability and toughness, and is excellent in wear resistance and surface-originated flaking life. A carbonitrided bearing part of the present embodiment has a chemical composition containing, in mass %, C: 0.15 to 0.45%, Si: not more than 0.50%, Mn: 0.40 to 1.50%, P: not more than 0.015%, S: not more than 0.005%, Cr: 0.30 to 2.0%, Mo: 0.10 to 0.35%, V: 0.20 to 0.40%, Al: 0.005 to 0.10%, N: not more than 0.030%, and O: not more than 0.0015%, with the balance being Fe and impurities, and satisfying Formulae (1) and (2). At surface, C concentration is 0.7 to 1.2%, N concentration is 0.15 to 0.6%, and Rockwell hardness HRC is 58 to 65. 1.20<0.4Cr+0.4Mo+4.5V<2.60??(1) 2.7C+0.4Si+Mn+0.8Cr+Mo+V>2.Type: ApplicationFiled: July 29, 2015Publication date: July 27, 2017Inventors: Yutaka NEISHI, Takahisa SUZUKI, Tatsuya KOYAMA, Shingo YAMASAKI, Kohei KANETANI, Takashi SADA
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Publication number: 20170167538Abstract: A bearing constituent member includes a base material including steel and a carbonitrided layer that is a surface layer on the steel, the steel including 0.3 to 0.45 mass % of carbon, 0.5 mass % or lower of silicon, 0.4 to 1.5 mass % of manganese, 0.3 to 2 mass % of chromium, 0.1 to 0.35 mass % of molybdenum, 0.2 to 0.4 mass % of vanadium, and a remainder of iron and unavoidable impurities. Surface Vickers hardness at a position at a depth of 50 ?m from a surface of a rolling sliding surface is 700 to 800, internal hardness is 550 to 690 in terms of Vickers hardness, and an amount of residual austenite in a range from the surface to a depth of 10 ?m is at least 30 vol %.Type: ApplicationFiled: December 1, 2016Publication date: June 15, 2017Applicants: JTEKT CORPORATION, NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Takashi SADA, Kohei KANETANI, Takahiro SHIMANO, Tetsuya HIRONAKA, Yutaka NEISHI, Tomohiro YAMASHITA
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Patent number: 9574255Abstract: A rolled steel bar has a composition consisting, by mass percent, of C: 0.27 to 0.37%, Si: 0.30 to 0.75%, Mn: 1.00 to 1.45%, S: 0.008% or more and less than 0.030%, Cr: 0.05 to 0.30%, Al: 0.005 to 0.050%, V: 0.200 to 0.320%, and N: 0.0080 to 0.0200%, the balance being Fe and impurities. The contents of P, Ti and O in the impurities are, by mass percent, P: 0.030% or less, Ti: 0.0040% or less, and O: 0.0020% or less. Y1 expressed by the formula <1> is 1.05 to 1.18. Y1=C+(1/10)Si+(1/5)Mn+(5/22)Cr+1.65V?(5/7)S??<1>. C, Si, Mn, Cr, V, and S in the formula represent mass percent of the elements. A hot-forged part having a tensile strength of 900 MPa or higher and a transverse endurance ratio of 0.47 can be obtained by the rolled steel bar.Type: GrantFiled: November 7, 2012Date of Patent: February 21, 2017Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Masashi Higashida, Hitoshi Matsumoto, Naoki Matsui, Yutaka Neishi, Taizo Makino
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Publication number: 20160333437Abstract: A bearing part according the present invention includes: C: 0.95% to 1.10%; Si: 0.10% to 0.70%; Mn: 0.20% to 1.20%; Cr: 0.90% to 1.60%; Al: 0.010% to 0.100%; N: 0.003% to 0.030%; P: 0.025% or less; S: 0.025% or less; O: 0.0010% or less; optionally one or more of the group consisting of Mo: 0.25% or less, B: 0.0050% or less, Cu: 1.0% or less, Ni: 3.0% or less, and Ca: 0.0015% or less; and a remainder including Fe and impurities; wherein a metallographic structure includes a retained austenite, a spherical cementite and a martensite; in which an amount of the retained austenite is 18% to 25%, by volume %; an average grain size of a prior-austenite is 6.0 ?m or less; an average grain size of the spherical cementite is 0.45 ?m or less; and a number density of the spherical cementite is 0.45×106 mm?2 or more in the metallographic structure.Type: ApplicationFiled: January 9, 2015Publication date: November 17, 2016Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Masashi SAKAMOTO, Junichi KODAMA, Yutaka NEISHI
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Publication number: 20160333438Abstract: A bearing part according the present invention includes, as the chemical composition, by mass %, C: 0.95% to 1.10%, Si: 0.10% to 0.70%, Mn: 0.20% to 1.20%, Cr: 0.90% to 1.60%, Al: 0.010% to 0.100%, N: 0.003% to 0.030%, P: 0.025% or less, S: 0.025% or less, O: 0.0010% or less, and optionally Mo: 0.25% or less, B: 0.0050% or less, Cu: 1.0% or less, Ni: 3.0% or less, and Ca: 0.0015% or less, and a remainder including Fe and impurities; metallographic structure includes a retained austenite, a spherical cementite and a martensite; an amount of the retained austenite is 15% to 25%, by volume %; an average grain size of prior-austenite is 8.0 ?m or less; and a number density of a void having a circle equivalent diameter of 0.02 ?m to 3.0 ?m is 2000 mm?2 or less in the metallographic structure.Type: ApplicationFiled: January 9, 2015Publication date: November 17, 2016Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Masashi SAKAMOTO, Junichi KODAMA, Yutaka NEISHI
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Publication number: 20160265092Abstract: An age-hardenable steel having a composition consisting of: C: 0.05 to 0.20%, Si: 0.01 to 0.50%, Mn: 1.5 to 2.5%, S: 0.005 to 0.08%, Cr: more than 0.50% and not more than 1.6%, Al: 0.005 to 0.05%, V: 0.25 to 0.50%, Mo: 0 to 1.0%, Cu: 0 to 0.3%, Ni: 0 to 0.3%, Ca: 0 to 0.005%, and Bi: 0 to 0.4%, the balance being Fe and impurities. Within the impurities, P?0.03%, Ti<0.005%, and N<0.0080%, and [C+0.3Mn+0.25Cr+0.6Mo?0.68], [C+0.1Si+0.2Mn+0.15Cr+0.35V+0.2Mo?1.05], and [?4.5C+Mn+Cr?3.5V?0.8Mo?0.12]. The steel has hardness before aging of not more than 310 HV. After aging, the fatigue strength is not less than 480 MPa and absorbed energy at 20° C. is not less than 12 J.Type: ApplicationFiled: October 1, 2014Publication date: September 15, 2016Inventors: Masashi HIGASHIDA, Masato YUYA, Hitoshi MATSUMOTO, Tatsuya HASEGAWA, Yutaka NEISHI, Taizo MAKINO
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Publication number: 20160265077Abstract: A roughly shaped material for a rolling bearing of the present invention is produced by forging a steel composed of a high-carbon chrome bearing steel containing 0.7 mass % to 1.2 mass % of a carbon, and 0.8 mass % to 1.8 mass % of a chromium to a predetermined shape while heating the steel to a forging temperature in a range of (Ae1 point+25° C.) to (Ae1 point+105° C.), cooling a forged article to a temperature of Ae1 point or lower, and performing an annealing in which the forged article that is obtained is heated to a soaking temperature in a range of (Ae1 point+25° C.) to (Ae1 point+85° C.), the forged article is retained for 0.5 hours or longer, and the forged article is cooled down to 700° C. or lower at a cooling rate of 0.30° C./s or slower.Type: ApplicationFiled: October 27, 2014Publication date: September 15, 2016Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Takefumi YANO, Shinichirou KASHIWAGI, Hiroki UEKITA, Toshikazu SAITOU, Tetsurou HIRANO, Yutaka NEISHI