Patents by Inventor Hiromu Izumida
Hiromu Izumida 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).
-
Patent number: 11892048Abstract: A spring steel wire includes a main body made of a steel and having a line shape, and an oxidized layer covering an outer peripheral surface of the main body. The steel constituting the main body contains not less than 0.5 mass % and not more than 0.7 mass % C, not less than 1 mass % and not more than 2.5 mass % Si, not less than 0.2 mass % and not more than 1 mass % Mn, and not less than 0.5 mass % and not more than 2 mass % Cr, with the balance being Fe and unavoidable impurities. The steel constituting the main body has a pearlite structure. The oxidized layer has a thickness of not less than 2 ?m and not more than 5 ?m. The oxidized layer contains not less than 60 mass % Fe3O4.Type: GrantFiled: June 15, 2020Date of Patent: February 6, 2024Assignee: Sumitomo Electric Industries, Ltd.Inventors: Hiromu Izumida, Yoshiki Natsumeda, Taichi Okada
-
Patent number: 11807923Abstract: A spring steel wire includes a main body made of a steel and having a line shape, and an oxidized layer covering an outer peripheral surface of the main body. The steel constituting the main body contains not less than 0.62 mass % and not more than 0.68 mass % C, not less than 1.6 mass % and not more than 2 mass % Si, not less than 0.2 mass % and not more than 0.5 mass % Mn, not less than 1.7 mass % and not more than 2 mass % Cr, and not less than 0.15 mass % and not more than 0.25 mass % V, with the balance being Fe and unavoidable impurities. A value obtained by dividing a sum of a Si content and a Mn content by a Cr content is not less than 0.9 and not more than 1.4. The steel constituting the main body has a tempered martensite structure.Type: GrantFiled: June 17, 2020Date of Patent: November 7, 2023Assignee: Sumitomo Electric Industries, Ltd.Inventors: Hiromu Izumida, Tetsuya Nakajima
-
Patent number: 11674193Abstract: A canted coil spring includes a core wire 10 formed of steel having a pearlite structure; and a copper plating layer 20 formed of copper or a copper alloy and covering an outer circumferential surface 11 of the core wire 10. The steel contains 0.5 mass % or more and 1.0 mass % or less carbon, 0.1 mass % or more and 2.5 mass % or less silicon, and 0.3 mass % or more and 0.9 mass % or less manganese, with the balance being iron and inevitable impurities. The copper plating layer 20 has a crystallite size of 220±50 ?.Type: GrantFiled: March 13, 2018Date of Patent: June 13, 2023Assignee: Sumitomo Electric Industries, Ltd.Inventors: Takumi Akada, Hiromu Izumida
-
Patent number: 11459644Abstract: A copper-coated steel wire includes: a core wire made of steel having a pearlite structure; and a coating layer covering a surface of the core wire and made of Cu or a Cu alloy. The steel contains C by greater than or equal to 0.5% by mass and less than or equal to 1.0% by mass, Si by greater than or equal to 0.1% by mass and less than or equal to 2.5% by mass, Mn by greater than or equal to 0.3% by mass and less than or equal to 0.9% by mass, and the balance consisting of Fe and inevitable impurities. In a cross section perpendicular to a longitudinal direction, a value of surface roughness Ra of the core wire is greater than or equal to 25% and less than or equal to 70% of a thickness of the coating layer.Type: GrantFiled: October 22, 2018Date of Patent: October 4, 2022Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Takumi Akada, Hiromu Izumida
-
Publication number: 20220307115Abstract: A steel wire is formed of a steel containing: not less than 0.6 mass % and not more than 0.7 mass % carbon, not less than 1.2 mass % and not more than 2.1 mass % silicon, not less than 0.2 mass % and not more than 0.6 mass % manganese, not less than 1.4 mass % and not more than 2 mass % chromium, and not less than 0.15 mass % and not more than 0.3 mass % vanadium, with the balance being iron and unavoidable impurities. The steel includes a matrix made up of tempered martensite, and a non-metallic inclusion present in the matrix. When ?area of the non-metallic inclusion is represented as H1 and ?area of a region including both the non-metallic inclusion and a decreased-hardness portion is represented as H2, a ratio of H2 to H1, or, H2/H1 is at least 1 and less than 1.3.Type: ApplicationFiled: April 7, 2020Publication date: September 29, 2022Applicant: Sumitomo Electric Industries, Ltd.Inventors: Tetsuya NAKAJIMA, Fuminori OKADA, Kazuaki SUGIMURA, Hiromu IZUMIDA, Katsutoshi IWAMOTO
-
Publication number: 20220186349Abstract: A spring steel wire includes a main body made of a steel and having a line shape, and an oxidized layer covering an outer peripheral surface of the main body. The steel constituting the main body contains not less than 0.62 mass % and not more than 0.68 mass % C, not less than 1.6 mass % and not more than 2 mass % Si, not less than 0.2 mass % and not more than 0.5 mass % Mn, not less than 1.7 mass % and not more than 2 mass % Cr, and not less than 0.15 mass % and not more than 0.25 mass % V, with the balance being Fe and unavoidable impurities. A value obtained by dividing a sum of a Si content and a Mn content by a Cr content is not less than 0.9 and not more than 1.4. The steel constituting the main body has a tempered martensite structure.Type: ApplicationFiled: June 17, 2020Publication date: June 16, 2022Applicant: Sumitomo Electric Industries, Ltd.Inventors: Hiromu IZUMIDA, Tetsuya NAKAJIMA
-
Publication number: 20220186803Abstract: A spring steel wire includes a main body made of a steel and having a line shape, and an oxidized layer covering an outer peripheral surface of the main body. The steel constituting the main body contains not less than 0.5 mass % and not more than 0.7 mass % C, not less than 1 mass % and not more than 2.5 mass % Si, not less than 0.2 mass % and not more than 1 mass % Mn, and not less than 0.5 mass % and not more than 2 mass % Cr, with the balance being Fe and unavoidable impurities. The steel constituting the main body has a pearlite structure. The oxidized layer has a thickness of not less than 2 ?m and not more than 5 ?m. The oxidized layer contains not less than 60 mass % Fe3O4.Type: ApplicationFiled: June 15, 2020Publication date: June 16, 2022Applicant: Sumitomo Electric Industries, Ltd.Inventors: Hiromu IZUMIDA, Yoshiki NATSUMEDA, Taichi OKADA
-
Patent number: 11186902Abstract: A wire material for a canted coil spring includes a core wire composed of a steel having a pearlite structure, a copper plating layer covering the outer peripheral surface of the core wire, the copper plating layer being composed of copper or a copper alloy, and a hard layer disposed adjacent to the outer periphery of the copper plating layer, the hard layer having a higher hardness than the copper plating layer. The steel constituting the core wire contains 0.5% or more by mass and 1.0% or less by mass carbon, 0.1% or more by mass and 2.5% or less by mass silicon, and 0.3% or more by mass and 0.9% or less by mass manganese, the balance being iron and unavoidable impurities.Type: GrantFiled: December 4, 2017Date of Patent: November 30, 2021Assignee: Sumitomo Electric Industries, Ltd.Inventors: Takumi Akada, Hiromu Izumida, Akihisa Hosoe
-
Publication number: 20210079505Abstract: A copper-coated steel wire includes: a core wire made of steel having a pearlite structure; and a coating layer covering a surface of the core wire and made of Cu or a Cu alloy. The steel contains C by greater than or equal to 0.5% by mass and less than or equal to 1.0% by mass, Si by greater than or equal to 0.1% by mass and less than or equal to 2.5% by mass, Mn by greater than or equal to 0.3% by mass and less than or equal to 0.9% by mass, and the balance consisting of Fe and inevitable impurities. In a cross section perpendicular to a longitudinal direction, a value of surface roughness Ra of the core wire is greater than or equal to 25% and less than or equal to 70% of a thickness of the coating layer.Type: ApplicationFiled: October 22, 2018Publication date: March 18, 2021Inventors: Takumi AKADA, Hiromu IZUMIDA
-
Publication number: 20200080166Abstract: A canted coil spring includes a core wire 10 formed of steel having a pearlite structure; and a copper plating layer 20 formed of copper or a copper alloy and covering an outer circumferential surface 11 of the core wire 10. The steel contains 0.5 mass % or more and 1.0 mass % or less carbon, 0.1 mass % or more and 2.5 mass % or less silicon, and 0.3 mass % or more and 0.9 mass % or less manganese, with the balance being iron and inevitable impurities. The copper plating layer 20 has a crystallite size of 220±50 ?.Type: ApplicationFiled: March 13, 2018Publication date: March 12, 2020Applicant: Sumitomo Electric Industries, Ltd.Inventors: Takumi AKADA, Hiromu IZUMIDA
-
Publication number: 20200056671Abstract: A wire material for a canted coil spring includes a core wire composed of a steel having a pearlite structure, a copper plating layer covering the outer peripheral surface of the core wire, the copper plating layer being composed of copper or a copper alloy, and a hard layer disposed adjacent to the outer periphery of the copper plating layer, the hard layer having a higher hardness than the copper plating layer. The steel constituting the core wire contains 0.5% or more by mass and 1.0% or less by mass carbon, 0.1% or more by mass and 2.5% or less by mass silicon, and 0.3% or more by mass and 0.9% or less by mass manganese, the balance being iron and unavoidable impurities.Type: ApplicationFiled: December 4, 2017Publication date: February 20, 2020Applicant: Sumitomo Electric Industries, Ltd.Inventors: Takumi AKADA, Hiromu IZUMIDA, Akihisa HOSOE
-
Patent number: 10475552Abstract: A strand for a wiring harness includes a first element wire and a second element wire twisted around the first element wire and made of copper or a copper alloy. The first element wire includes a core portion made of stainless steel and a covering layer covering the core portion and made of copper or a copper alloy.Type: GrantFiled: July 5, 2017Date of Patent: November 12, 2019Assignee: Sumitomo Electric Industries, Ltd.Inventors: Hiromu Izumida, Akihisa Hosoe, Takumi Akada, Shinei Takamura, Katsutoshi Iwamoto
-
Publication number: 20190272931Abstract: A strand for a wiring harness includes a first element wire and a second element wire twisted around the first element wire and made of copper or a copper alloy. The first element wire includes a core portion made of stainless steel and a covering layer covering the core portion and made of copper or a copper alloy.Type: ApplicationFiled: July 5, 2017Publication date: September 5, 2019Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Hiromu IZUMIDA, Akihisa HOSOE, Takumi AKADA, Shinei TAKAMURA, Katsutoshi IWAMOTO
-
Publication number: 20190154096Abstract: A wire material for a canted coil spring 1 includes a core wire 10 made of steel with a pearlite structure and a plating layer 20 covering a surface 11 of the core wire 10 and made of copper or a copper alloy. The steel constituting the core wire 10 contains 0.5% to 1.0% by mass of carbon, 0.1% to 2.5% by mass of silicon, and 0.3% to 0.9% by mass of manganese, with the balance being iron and unavoidable impurities.Type: ApplicationFiled: April 10, 2017Publication date: May 23, 2019Inventor: Hiromu IZUMIDA
-
Publication number: 20190074621Abstract: Provided is a connector terminal wire rod including: a base material containing a metallic material; a first metallic layer formed to be exposed on the base material, the first metallic layer containing Sn; and a second metallic layer formed to be exposed on the base material, the second metallic layer containing Sn and Pd and being different from the first metallic layer in composition.Type: ApplicationFiled: December 21, 2016Publication date: March 7, 2019Inventors: Mikio Sato, Hiromu Izumida
-
Patent number: 9849531Abstract: An object of the present invention is to improve machining speed by realizing both conductive properties and discharge performance with regard to an electrode wire for wire electric discharge machining, the electrode wire being obtained by plating a steel wire with a copper-zinc alloy. Another object is to suppress the occurrence of separation, cracking, and the like of plating in a wire-drawing step of an electrode wire. An electrode wire for wire electric discharge machining of the present invention includes a steel wire (11) serving as a core wire, and a plating layer (12) that covers the steel wire and that is composed of a copper-zinc alloy, in which an average zinc concentration of the plating layer is 60% to 75% by mass, a conductivity of the plating layer is 10% to 20% IACS, and a wire diameter is 30 to 200 ?m.Type: GrantFiled: September 2, 2014Date of Patent: December 26, 2017Assignees: Sumitomo Electric Industries, Ltd., Sumitomo (SEI) Steel Wire Corp.Inventors: Kazuaki Sugimura, Hiromu Izumida, Kenichi Shimizu, Shinei Takamura, Katsutoshi Iwamoto
-
Publication number: 20150360309Abstract: An object of the present invention is to improve machining speed by realizing both conductive properties and discharge performance with regard to an electrode wire for wire electric discharge machining, the electrode wire being obtained by plating a steel wire with a copper-zinc alloy. Another object is to suppress the occurrence of separation, cracking, and the like of plating in a wire-drawing step of an electrode wire. An electrode wire for wire electric discharge machining of the present invention includes a steel wire (11) serving as a core wire, and a plating layer (12) that covers the steel wire and that is composed of a copper-zinc alloy, in which an average zinc concentration of the plating layer is 60% to 75% by mass, a conductivity of the plating layer is 10% to 20% IACS, and a wire diameter is 30 to 200 ?m.Type: ApplicationFiled: September 2, 2014Publication date: December 17, 2015Applicants: Sumitomo Electric Industries, Ltd., Sumitomo (SEI) Steel Wire Corp.Inventors: Kazuaki SUGIMURA, Hiromu IZUMIDA, Kenichi SHIMIZU, Shinei TAKAMURA, Katsutoshi IWAMOTO
-
Publication number: 20150004052Abstract: A copper alloy having high strength and a high electrical conductivity in combination and a copper alloy wire are provided. A copper alloy contains 50 percent by mass or more and 95 percent by mass or less of Cu, 5 percent by mass or more and 50 percent by mass or less of Fe, and the remainder composed of deoxidizer elements and incidental impurities and has a texture exhibiting large diffraction peaks in the <111> orientation of Cu and in the <110> orientation of Fe when a cross-section is subjected to X-ray diffraction. The intensity ratio ICu( 111) of the diffraction peak in the <111> orientation of Cu to the intensity of the whole diffraction lines of Cu is 0.70 or more and 1.0 or less and the intensity ratio IFe(110) of the diffraction peak in the <110> orientation of Fe to the intensity of the whole diffraction lines of Fe is 0.90 or more and 1.0 or less.Type: ApplicationFiled: December 28, 2012Publication date: January 1, 2015Inventors: Hiromu Izumida, Kenichi Shimizu, Shinei Takamura
-
Patent number: 7717411Abstract: Provided is a high-strength stainless steel spring exhibiting a good workability and having a high load characteristic. Thus, the high-strength stainless steel spring of the invention has an chemical component containing 0.04 to 0.08% by mass of C, 0.15 to 0.22% by mass of N, 0.3 to 2.0% by mass of Si, 0.5 to 3.0% by mass of Mn, 16 to 20% by mass of Cr, 8.0 to 10.5% by mass of Ni, 0.5 to 3.0% by mass of Mo, and the balance of Fe and inevitable impurities, and when the average diameter of the coil is represented by D and further the diameter of the steel wire is represented by d in the case that cross sections of the stainless steel wire are in a complete round form or the value obtained by subtracting the average coil diameter from the outer diameter of the coil is represented by d? in the case that the cross sections of the stainless steel wire are in a form other than the complete round form, the spring has a spring index D/d or D/d? of 2 to 6.Type: GrantFiled: February 16, 2007Date of Patent: May 18, 2010Assignees: Sumitomo Electric Industries, Ltd., Sumitomo (SEI) Steel Wire Corp., NHK Spring Co., Ltd.Inventors: Hiromu Izumida, Nozomu Kawabe, Shinei Takamura, Teruyuki Murai, Noritoshi Takamura
-
Publication number: 20090174129Abstract: Provided is a high-strength stainless steel spring exhibiting a good workability and having a high load characteristic. Thus, the high-strength stainless steel spring of the invention has an chemical component containing 0.04 to 0.08% by mass of C, 0.15 to 0.22% by mass of N, 0.3 to 2.0% by mass of Si, 0.5 to 3.0% by mass of Mn, 16 to 20% by mass of Cr, 8.0 to 10.5% by mass of Ni, 0.5 to 3.0% by mass of Mo, and the balance of Fe and inevitable impurities, and when the average diameter of the coil is represented by D and further the diameter of the steel wire is represented by d in the case that cross sections of the stainless steel wire are in a complete round form or the value obtained by subtracting the average coil diameter from the outer diameter of the coil is represented by d? in the case that the cross sections of the stainless steel wire are in a form other than the complete round form, the spring has a spring index D/d or D/d? of 2 to 6.Type: ApplicationFiled: February 16, 2007Publication date: July 9, 2009Applicants: SUMITOMO ELECTRIC INDUSTRIES, LTD., SUMITOMO (SEI) STEEL WIRE CORP., NHK SPRING CO., LTD.Inventors: Hiromu Izumida, Nozomu Kawabe, Shinei Takamura, Teruyuki Murai, Noritoshi Takamura