Patents by Inventor Takuho KUMAGAI
Takuho KUMAGAI 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: 20230286032Abstract: Provided is a machining jig on which a carbon film (3) is formed on a machining surface of a rigid substrate (1), in which the carbon film (3) indicates a Raman spectroscopy spectrum with an intensity ratio, represented by the formula: ID/IG (where ID is the maximum peak intensity at 1333±10 cm?1 in the Raman spectroscopy spectrum of the carbon film surface, and IG is the maximum peak intensity at 1500±100 cm?1 in the Raman spectroscopy spectrum of the carbon film surface), exceeding 0.6. Also provided is a method of manufacturing seamless can bodies, the method including a step of using a mold machining member, on which a diamond film is formed on a machining surface, to press work a metal material onto the machining surface of the mold machining member in a state where a coolant is interposed.Type: ApplicationFiled: May 16, 2023Publication date: September 14, 2023Inventors: Ryozo SHIROISHI, Naoya MATSUMOTO, Masahiro SHIMAMURA, Takuho KUMAGAI, Tomohiro OGAWA
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Patent number: 11745245Abstract: A metallic worked article suppressing the worked surfaces from being scratched during the plastic work that is conducted aiming at reducing the thickness or decreasing the diameter. The metallic worked article has a reduced thickness or a decreased diameter as obtained through the plastic work, wherein on the worked surface thereof, the ratio Ra1/Ra2 of an arithmetic mean roughness Ra1 measured in a direction at right angles with the direction of working and an arithmetic mean roughness Ra2 measured in the direction of working, is from 0.5 to 1.5.Type: GrantFiled: March 14, 2019Date of Patent: September 5, 2023Assignee: TOYO SEIKAN GROUP HOLDINGS, LTD.Inventors: Takuho Kumagai, Ryozo Shiroishi, Naoya Matsumoto, Masahiro Shimamura, Tomohiro Ogawa
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Publication number: 20230122197Abstract: Provided is a manufacturing method of a bottomed cylindrical body, which can achieve both severe can making processing such as conventional drawing and ironing, and cost reduction and environmental load reduction in a washing step. A manufacturing method of a bottomed cylindrical body includes a drawing step of drawing a metal sheet by use of forming members each of which has a hardness of Hv 1500 to 12000 at its processing surface, and an ironing step of ironing a workpiece into the bottomed cylindrical body via a coolant by use of forming members each of which has a carbon film at its processing surface, and the coolant is a water-soluble coolant or a coolant having a boiling point of lower than 300° C.Type: ApplicationFiled: March 10, 2021Publication date: April 20, 2023Inventors: Ryozo SHIROISHI, Naoya MATSUMOTO, Masahiro SHIMAMURA, Takuho KUMAGAI, Tomohiro OGAWA
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Publication number: 20230119966Abstract: There is provided a method for manufacturing a bottomed cylindrical body, the method being capable of achieving both a conventional hard can manufacturing process such as drawing and ironing and reduction in the cost and the environmental load in a degreasing step. The method for manufacturing a bottomed cylindrical body includes a lubricant application step of applying liquid (lubricant) having a viscosity of lower than 200 mPa·s to a surface of a metal plate, a drawing step of drawing the metal plate to which. the lubricant has been applied, with use of a forming member having a processing surface having a hardness of Hv 1000 to 12000, an ironing step of ironing, with use of another forming member having a processing surface having a hardness of Hv 1500 to 12000, a workpiece with a coolant interposed between the workpiece and the another forming member, to form a bottomed cylindrical body, and a degreasing step of degreasing oil on a surface of the bottomed cylindrical body with use of a cleaning agent.Type: ApplicationFiled: March 9, 2021Publication date: April 20, 2023Inventors: Ryozo SHIROISHI, Naoya MATSUMOTO, Masahiro SHIMAMURA, Takuho KUMAGAI, Tomohiro OGAWA
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Publication number: 20220234780Abstract: An aluminum can that has a maximum height of roughness Rz1 in the circumferential direction of not more than 0.5 ?m on the outer surface of the thinnest portion of the body portion and, as viewed on the side surface, has a ratio Ra1/Ra2 in a range of 0.8 to 1.2, the ratio Ra1/Ra2 being that of a mean surface roughness Ra1 in the circumferential direction on the outer surface of the thinnest portion of the body portion and a mean surface roughness Ra2 in the circumferential direction on the outer surface of the lower end portion of the body portion.Type: ApplicationFiled: April 19, 2022Publication date: July 28, 2022Applicants: TOYO SEIKAN CO., LTD., TOYO SEIKAN GROUP HOLDINGS, LTD.Inventors: Norihisa HIROTA, Ryozo SHIROISHI, Takuho KUMAGAI, Kenichi TAKAO
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Patent number: 11338954Abstract: An aluminum can wherein, when the light reflected by the outer surface of the body portion of the aluminum can is evaluated based on the LCH method by using a multi-angle spectral colorimeter, the aluminum can features a ratio C15h/C15w of 0.6 to 1.4, the ratio C15h/C15w being that of a saturation value C15h of the light reflected at 15 degrees in the direction of height and a saturation value C15w of the light reflected at an angle 15 of degrees in the circumferential direction based on the light regularly reflected from the light that is incident at 45 degrees in the direction of height and in the circumferential direction.Type: GrantFiled: October 20, 2017Date of Patent: May 24, 2022Assignees: TOYO SEIKAN CO., LTD., TOYO SEIKAN GROUP HOLDINGS, LTD.Inventors: Norihisa Hirota, Ryozo Shiroishi, Takuho Kumagai, Kenichi Takao
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Patent number: 11267033Abstract: A mold used for blanking a metal plate to shape a blank to be drawn. The mold has a surface treatment film and a top face to be brought into contact with the metal plate and a peripheral end face communicated indirectly with the top face. At least the top face is coated with the surface treatment film.Type: GrantFiled: November 22, 2016Date of Patent: March 8, 2022Assignee: TOYO SEIKAN GROUP HOLDINGS, LTD.Inventors: Ryozo Shiroishi, Kenichi Takao, Takuho Kumagai
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Publication number: 20210394248Abstract: [Object] A pressing die and a press working method that can achieve both facilitation of management of an appropriate clearance and working durability at a high level are provided. [Solving Means] The pressing die of the present invention is a pressing die for press working a metal material using a punch part and a die part. A working surface of one of the punch part and the die part is coated with a diamond film the working surface contacting with the metal material. A working surface of the other one of the punch part and the die part is coated with a surface treatment film having a Vickers hardness of 8000 Hv or less the working surface contacting with the metal material.Type: ApplicationFiled: September 18, 2019Publication date: December 23, 2021Inventors: Takuho KUMAGAI, Ryozo SHIROISHI, Tomohiro OGAWA, Naoya MATSUMOTO, Masahiro SHIMAMURA
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Publication number: 20210354186Abstract: A jig for metal plastic working for use in plastic working of a metal or alloy workpiece, in which a working surface is moved relative to the workpiece in contact with the workpiece. The working surface of the jig is smoothed so that an arithmetic mean surface roughness Ra is not more than 0.12 ?m, and so that no protrusion is observed that has a width of not less than 200 ?m and a height of not less than 10 ?m, which are calculated on a basis of a projection thereof along a working direction.Type: ApplicationFiled: October 16, 2019Publication date: November 18, 2021Applicant: Toyo Seikan Group Holdings, Ltd.Inventors: Takuho KUMAGAI, Tomohiro OGAWA, Ryozo SHIROISHI, Naoya MATSUMOTO, Masahiro SHIMAMURA
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Publication number: 20210354191Abstract: Provided is a machining jig on which a carbon film (3) is formed on a machining surface of a rigid substrate (1), in which the carbon film (3) indicates a Raman spectroscopy spectrum with an intensity ratio, represented by the formula: ID/IG (where ID is the maximum peak intensity at 1333±10 cm?1 in the Raman spectroscopy spectrum of the carbon film surface, and IG is the maximum peak intensity at 1500±100 cm?1 in the Raman spectroscopy spectrum of the carbon film surface), exceeding 0.6. Also provided is a method of manufacturing seamless can bodies, the method including a step of using a mold machining member, on which a diamond film is formed on a machining surface, to press work a metal material onto the machining surface of the mold machining member in a state where a coolant is interposed.Type: ApplicationFiled: October 17, 2019Publication date: November 18, 2021Inventors: Ryozo SHIROISHI, Naoya MATSUMOTO, Masahiro SHIMAMURA, Takuho KUMAGAI, Tomohiro OGAWA
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Publication number: 20210069767Abstract: A method of producing aluminum cans, including an ironing step using an ironing die (30). The ironing die has a carbon film (50) formed as to cover a working surface thereof. The carbon film exhibits a Raman spectrum such that an intensity ratio represented by ID/IG wherein ID is a maximum peak intensity at 1333±10 cm?1 in the Raman spectrum of the surface of said carbon film, and IG is a maximum peak intensity at 1500±100 cm?1 in the Raman spectrum of the surface of said carbon film, is not less than 1.2. The surface of the carbon film is a smooth surface having an arithmetic mean roughness R of not more than 0.05 ?m. Further, the ironing step includes iron-working an aluminum sheet in a dry process using no lubricant while maintaining an ironing ratio in excess of 40%.Type: ApplicationFiled: November 16, 2020Publication date: March 11, 2021Applicant: TOYO SEIKAN GROUP HOLDINGS, LTD.Inventors: Takuho Kumagai, Kenichi Takao, Ryozo Shiroishi, Masahiro Shimamura, Naoya Matsumoto
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Publication number: 20210023603Abstract: A metallic worked article suppressing the worked surfaces from being scratched during the plastic work that is conducted aiming at reducing the thickness or decreasing the diameter. The metallic worked article has a reduced thickness or a decreased diameter as obtained through the plastic work, wherein on the worked surface thereof, the ratio Ra1/Ra2 of an arithmetic mean roughness Ra1 measured in a direction at right angles with the direction of working and an arithmetic mean roughness Ra2 measured in the direction of working, is from 0.5 to 1.5.Type: ApplicationFiled: March 14, 2019Publication date: January 28, 2021Applicant: TOYO SEIKAN GROUP HOLDINGS, LTD.Inventors: Takuho KUMAGAI, Ryozo SHIROISHI, Naoya MATSUMOTO, Masahiro SHIMAMURA, Tomohiro OGAWA
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Publication number: 20200071017Abstract: An aluminum can wherein, when the light reflected by the outer surface of the body portion of the aluminum can is evaluated based on the LCH method by using a multi-angle spectral colorimeter, the aluminum can features a ratio C15h/C15w of 0.6 to 1.4, the ratio C15h/C15w being that of a saturation value C15h of the light reflected at 15 degrees in the direction of height and a saturation value C15w of the light reflected at an angle 15 of degrees in the circumferential direction based on the light regularly reflected from the light that is incident at 45 degrees in the direction of height and in the circumferential direction.Type: ApplicationFiled: October 20, 2017Publication date: March 5, 2020Applicants: TOYO SEIKAN CO., LTD., TOYO SEIKAN GROUP HOLDINGS, LTD.Inventors: Norihisa HIROTA, Ryozo SHIROISHI, Takuho KUMAGAI, Kenichi TAKAO
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Publication number: 20180318900Abstract: A mold used for blanking a metal plate to shape a blank to be drawn. The mold has a surface treatment film and a top face to be brought into contact with the metal plate and a peripheral end face communicated indirectly with the top face. At least the top face is coated with the surface treatment film.Type: ApplicationFiled: November 22, 2016Publication date: November 8, 2018Applicant: TOYO SEIKAN GROUP HOLDINGS, LTD.Inventors: Ryozo SHIROISHI, Kenichi TAKAO, Takuho KUMAGAI
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Publication number: 20180229287Abstract: A die (30) for ironing working, the die (30) having a carbon film 50 covering at least a working surface (41) thereof, the carbon film (50) exhibiting such a Raman spectrum that an intensity ratio represented by the following formula (1): ID/IG??(1) wherein ID is a maximum peak intensity at 1333±10 cm?1 in the Raman spectrum of the surface of the carbon film, and IG is a maximum peak intensity at 1500±100 cm?1 in the Raman spectrum of the surface of the carbon film, is not less than 1.0, and the surface of the carbon film 50 being a smooth surface having an arithmetic mean roughness R of not more than 0.1 ?m.Type: ApplicationFiled: August 15, 2016Publication date: August 16, 2018Applicant: TOYO SEIKAN GROUP HOLDINGS, LTD.Inventors: Takuho KUMAGAI, Kenichi TAKAO, Ryozo SHIROISHI, Masahiro SHIMAMURA, Naoya MATSUMOTO