Patents by Inventor Yoshiya Inagaki
Yoshiya Inagaki 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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Publication number: 20180148815Abstract: In the microstructure of a hot-forged 6000-series aluminum alloy having a specific chemical composition, grains including small grains with a misorientation of 2° or more are refined, and a KAM, which is an average misorientation of the grains, is controlled within a specific range. This allows the hot-forged 6000-series aluminum alloy to have excellent stress corrosion cracking resistance and still have high tensile strength, high yield strength, and high elongation.Type: ApplicationFiled: June 8, 2016Publication date: May 31, 2018Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Hisao SHISHIDO, Yoshiya INAGAKI, Masayuki HORI
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Patent number: 9605333Abstract: The aluminum alloy forged material for an automobile according to the present invention is composed of an aluminum alloy including Si: 0.7-1.5 mass %, Fe: 0.5 mass % or less, Cu: 0.1-0.6 mass %, Mg: 0.6-1.2 mass %, Ti: 0.01-0.1 mass % and Mn: 0.25-1.0 mass %, further including at least one element selected from Cr: 0.1-0.4 mass % and Zr: 0.01-0.2 mass %, restricting Zn: 0.05 mass % or less, and a hydrogen amount: 0.25 ml/100 g-Al or less, with the remainder being Al and inevitable impurities, wherein the aluminum alloy forged material has an area ratio the <111> texture of 60% or more in a cross section parallel to the extrusion direction.Type: GrantFiled: February 27, 2014Date of Patent: March 28, 2017Assignee: Kobe Steel, Ltd.Inventors: Masayuki Hori, Yoshiya Inagaki, Manabu Nakai
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Publication number: 20170073802Abstract: Provided are: a forged aluminum alloy that offers high strength and high toughness and still has excellent corrosion resistance even when having a smaller thickness; and a method for producing the forged aluminum alloy. The forged aluminum alloy contains Mg in a content of 0.70 to 1.50 mass percent, Si in a content of 0.80 to 1.30 mass percent, Cu in a content of 0.30 to 0.90 mass percent, Fe in a content of 0.10 to 0.40 mass percent, Ti in a content of 0.005 to 0.15 mass percent, and at least one element selected from the group consisting of Mn in a content of 0.10 to 0.60 mass percent, Cr in a content of 0.10 to 0.45 mass percent, and Zr in a content of 0.05 to 0.30 mass percent, with the remainder consisting of Al and inevitable impurities. The forged aluminum alloy has a major axis of Q phase of 50 to 500 nm in a maximum-stress-receiving region.Type: ApplicationFiled: March 13, 2015Publication date: March 16, 2017Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Masayuki HORI, Yoshiya INAGAKI
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Patent number: 9527369Abstract: For manufacturing an aluminum alloy automobile suspension part, an ingot material is heat treated and forged, a through-hole is formed therein and it is subjected to thermal refining. A minimum length between a rib end on a side of the through-hole and a through-hole end is made 6 mm or larger.Type: GrantFiled: May 9, 2013Date of Patent: December 27, 2016Assignee: Kobe Steel, Ltd.Inventors: Shogo Sakamoto, Yoshiya Inagaki
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Patent number: 9481920Abstract: Disclosed is an aluminum alloy forging for use in automotive suspension parts and the like, and a method of manufacture for same. The aluminum alloy forging contains Si 0.4-1.5 wt %, Fe greater than 0.4 wt % and equal to or less than 1.0 wt %, Cu equal to or less than 0.40 wt %, Mg 0.8-1.3 wt % and Ti 0.01-0.1 wt %; Zn is restricted to equal to or less than 0.05 wt %; and the aluminum alloy forging contains at least one selected from among the following group comprising: Mn 0.01-1.0 wt % and Cr 0.1-0.4%; and Zr 0.05-0.2 wt %. Hydrogen content is restricted to 0.25 ml or less per 100 g of Al, and the remainder is composed of unavoidable impurities and Al. The average grain size is 50 ?m or less, the crystallized area ratio is 3% or less, and the average crystallized grain size is 8 ?m or less.Type: GrantFiled: March 8, 2011Date of Patent: November 1, 2016Assignee: Kobe Steel, Ltd.Inventors: Masayuki Hori, Yoshiya Inagaki
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Patent number: 9279173Abstract: An aluminum alloy forged material for automotive vehicles comprises 0.6˜1.2 mass % of Mg, 0.7˜1.5 mass % of Si, 0.1.˜0.5 mass % of Fe, 0.01˜0.1 mass % of Ti, 0.3˜1.0 mass % of Mn, at least one of 0.1˜0.4 mass % of Cr and 0.05˜0.2 mass % of Zr, a restricted amount of Cu that is less than or equal to 0.1 mass %, a restricted amount of Zn that is less than or equal to 0.05 mass %, a restricted amount of H that is less than or equal to 0.25 ml in 100 g Al and a remainder of Al and inevitably contained impurities, and the material includes precipitated crystalline particles among which the largest one has a maximum equivalent circle diameter equal to or less than 8 ?m and an area ratio of the precipitated crystalline particles is equal to or less than 3.6%.Type: GrantFiled: March 15, 2013Date of Patent: March 8, 2016Assignee: Kobe Steel, Ltd.Inventors: Masayuki Hori, Yoshiya Inagaki, Manabu Nakai
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Patent number: 9175372Abstract: It is an object to provide an aluminum alloy forged material for an automobile excellent in tensile strength while maintaining excellent corrosion resistance, and a method for manufacturing the same. Provided are the aluminum alloy forged material for an automobile and a method for manufacturing the same, the aluminum alloy forged material being composed of an aluminum alloy including Si: 0.7-1.5 mass %, Fe: 0.1-0.5 mass %, Mg: 0.6-1.2 mass %, Ti: 0.01-0.1 mass % and Mn: 0.3-1.0 mass %, further including at least one element selected from Cr: 0.1-0.4 mass % and Zr: 0.01-0.2 mass %, restricting Cu: 0.1 mass % or less and Zn: 0.05 mass % or less, and a hydrogen amount: 0.25 ml/100 g-Al or less, the remainder being Al and unavoidable impurities, in which the depth of recrystallization from the surface is 5 mm or less.Type: GrantFiled: March 13, 2013Date of Patent: November 3, 2015Assignee: Kobe Steel, Ltd.Inventors: Masayuki Hori, Yoshiya Inagaki
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Patent number: 8961714Abstract: A lightweight automobile suspension part having high strength is an aluminum alloy automobile suspension part having a through-hole, which has a yield strength of a normal section as a region where a crystal grain is not coarsened being 270 MPa or larger, and a minimum length between a rib end as a predetermined region on a side of the through-hole in a rib and a through-hole end as a predetermined region on a side of the through-hole in a web is 6 mm or larger.Type: GrantFiled: March 8, 2011Date of Patent: February 24, 2015Assignee: Kobe Steel, Ltd.Inventors: Shogo Sakamoto, Yoshiya Inagaki
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Publication number: 20140367001Abstract: Provided is an aluminum alloy forged material comprising an excess amount of Si and a large quantity of a strength-increasing element such as Cu or Mn, and by which high strength and high toughness can be stably obtained even if the forged material is thinned, and also provided is a method for producing the same. A forged material constituted from an aluminum alloy which contains prescribed quantities of Mg, Si, Cu, Fe, Ti and B and further contains one or more elements selected from among Mn, Cr and Zr, with the remainder comprising Al and inevitable impurities, wherein the electrical conductivity measured at 20° C. on the surface of the aluminum alloy is greater than 42.5% IACS but not more than 46.0% IACS, and the forged aluminum alloy material has 0.2% proof stress of 360 MPa or more and Charpy impact value of 6 J/cm2 or more.Type: ApplicationFiled: January 10, 2013Publication date: December 18, 2014Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Yoshiya Inagaki, Masayuki Hori
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Publication number: 20140290809Abstract: The aluminum alloy forged material for an automobile according to the present invention is composed of an aluminum alloy including Si: 0.7-1.5 mass %, Fe: 0.5 mass % or less, Cu: 0.1-0.6 mass %, Mg: 0.6-1.2 mass %, Ti: 0.01-0.1 mass % and Mn: 0.25-1.0 mass %, further including at least one element selected from Cr: 0.1-0.4 mass % and Zr: 0.01-0.2 mass %, restricting Zn: 0.05 mass % or less, and a hydrogen amount: 0.25 ml/100 g-Al or less, with the remainder being Al and inevitable impurities, wherein the aluminum alloy forged material has an area ratio the <111> texture of 60% or more in a cross section parallel to the extrusion direction.Type: ApplicationFiled: February 27, 2014Publication date: October 2, 2014Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Masayuki HORI, Yoshiya Inagaki, Manabu Nakai
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Publication number: 20130255841Abstract: It is an object to provide an aluminum alloy forged material for an automobile excellent in tensile strength while maintaining excellent corrosion resistance, and a method for manufacturing the same. Provided are the aluminum alloy forged material for an automobile and a method for manufacturing the same, the aluminum alloy forged material being composed of an aluminum alloy including Si: 0.7-1.5 mass %, Fe: 0.1-0.5 mass %, Mg: 0.6-1.2 mass %, Ti: 0.01-0.1 mass % and Mn: 0.3-1.0 mass %, further including at least one element selected from Cr: 0.1-0.4 mass % and Zr: 0.01-0.2 mass %, restricting Cu: 0.1 mass % or less and Zn: 0.05 mass % or less, and a hydrogen amount: 0.25 ml/100 g-Al or less, the remainder being Al and unavoidable impurities, in which the depth of recrystallization from the surface is 5 mm or less.Type: ApplicationFiled: March 13, 2013Publication date: October 3, 2013Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Masayuki HORI, Yoshiya Inagaki
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Patent number: 8372220Abstract: There are provided an aluminum alloy forging having high strength, toughness, and resistance to corrosion in response to the thinning of automotive underbody parts, and a process for production thereof. The aluminum alloy forging includes an aluminum alloy containing predetermined amounts of Mg, Si, Mn, Fe, Zn, Cu, Cr, Zr, and Ti with the balance being composed of Al and inevitable impurities, and having a hydrogen gas concentration of 0.25 ml/100 g of Al. In the aluminum alloy forging mentioned above, the area ratio of Mg2Si having a maximum length of 0.1 ?m or above is 0.15% or below, the recrystallization ratio of the aluminum alloy is 20% or below, and a size distribution index value defined by V/r of dispersed particles of the aluminum alloy (V: the area ratio [%] of the dispersed particles, and r: the average radius [nm] of the dispersed particles) is 0.20 or above.Type: GrantFiled: March 13, 2008Date of Patent: February 12, 2013Assignee: Kobe Steel, Ltd.Inventors: Yoshiya Inagaki, Manabu Nakai, Atsumi Fukuda
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Patent number: 8152940Abstract: The present invention provides an aluminum alloy forging material having enhanced strength, toughness, and corrosion resistance, and a method of producing the material. An aluminum alloy forging material 1 produced with specified components under specified conditions has an arm portion 2 including a relatively narrow and thick peripheral rib 3 and a thin and relatively wide central web 4 having a thickness of 10 mm or less and having a substantially H-shaped sectional form.Type: GrantFiled: March 23, 2007Date of Patent: April 10, 2012Assignee: Kobe Steel, Ltd.Inventors: Manabu Nakai, Yoshiya Inagaki, Atsumi Fukuda
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Publication number: 20110221151Abstract: A lightweight automobile suspension part having high strength is an aluminum alloy automobile suspension part having a through-hole, which has a yield strength of a normal section as a region where a crystal grain is not coarsened being 270 MPa or larger, and a minimum length between a rib end as a predetermined region on a side of the through-hole in a rib and a through-hole end as a predetermined region on a side of the through-hole in a web is 6 mm or larger.Type: ApplicationFiled: March 8, 2011Publication date: September 15, 2011Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Shogo SAKAMOTO, Yoshiya Inagaki
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Publication number: 20100089503Abstract: There are provided an aluminum alloy forging having high strength, toughness, and resistance to corrosion in response to the thinning of automotive underbody parts, and a process for production thereof. The aluminum alloy forging includes an aluminum alloy containing predetermined amounts of Mg, Si, Mn, Fe, Zn, Cu, Cr, Zr, and Ti with the balance being composed of Al and inevitable impurities, and having a hydrogen gas concentration of 0.25 ml/100 g of Al. In the aluminum alloy forging mentioned above, the area ratio of Mg2Si having a maximum length of 0.1 ?m or above is 0.15% or below, the recrystallization ratio of the aluminum alloy is 20% or below, and a size distribution index value defined by V/r of dispersed particles of the aluminum alloy (V: the area ratio [%] of the dispersed particles, and r: the average radius [nm] of the dispersed particles) is 0.20 or above.Type: ApplicationFiled: March 13, 2008Publication date: April 15, 2010Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Yoshiya Inagaki, Manabu Nakai, Atsumi Fukuda
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Publication number: 20090000705Abstract: The present invention provides an aluminum alloy forging material having enhanced strength, toughness, and corrosion resistance, and a method of producing the material. An aluminum alloy forging material 1 produced with specified components under specified conditions has an arm portion 2 including a relatively narrow and thick peripheral rib 3 and a thin and relatively wide central web 4 having a thickness of 10 mm or less and having a substantially H-shaped sectional form.Type: ApplicationFiled: March 23, 2007Publication date: January 1, 2009Applicant: KAB, KAISHA KOBE SEIKO SHO (Kobe Steel, Ltd.)Inventors: Manabu Nakai, Yoshiya Inagaki, Atsumi Fukuda
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Patent number: 6678574Abstract: A method for producing suspension parts via preforming the workpiece by roll forming. The sectional area and length of the workpiece are calculated. In the former step, more than one orthogonal cross-section is acquired from the suspension part of aluminum alloy, and the sectional area is converted into the area of a circle. An imaginary area is calculated by adding to the converted area an adequate amount of flash. In the latter step, a circular truncated cone is defined from two adjacent imaginary circles and the length of the imaginary center line between the two adjacent imaginary circles. A solid of revolution is defined by connecting these circular truncated cones, and the volume of the suspension part of aluminum alloy is substituted by the volume of the solid of revolution. The value obtained by dividing the sectional area of the workpiece by the volume is regarded as the-length of the workpiece.Type: GrantFiled: October 10, 2001Date of Patent: January 13, 2004Assignee: Kobe Steel, Ltd.Inventors: Takumi Fujii, Koji Takeuchi, Hiroyuki Tsutsumi, Yoshiya Inagaki, Atumi Fukuda
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Publication number: 20020062163Abstract: A method for determining the dimensions of the workpiece that can be roll-formed for preforming. A method for producing suspension parts via preforming the workpiece by roll forming.Type: ApplicationFiled: October 10, 2001Publication date: May 23, 2002Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Takumi Fujii, Koji Takeuchi, Hiroyuki Tsutsumi, Yoshiya Inagaki, Atumi Fukuda