# US 2017/0290102 A1 · Induction heating device for metal strip > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0290102 A1 - Document ID: US20170290102A1 - Status: Published application - Kind: A1 - Application number: 15/508,057 - Filed: 2015-09-04 - Published: 2017-10-05 - Earliest claimed: 2014-09-05 - Assignees: Nippon Steel & Sumitomo Metal Corporation - Applicants: Nippon Steel & Sumitomo Metal Corporation - Inventors: Yoshiaki HIROTA; Masato TAIRA - Web page: https://patentgrep.com/patent/US20170290102A1 ## CPC - H05B 6/10: Induction heating apparatus, other than furnaces, for specific applications - C21D 1/00: General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering - C21D 1/42: Induction heating - C21D 9/60: with induction heating - F27B 9/36: Arrangements of heating devices - F27D 11/06: Induction heating, i.e. in which the material being heated, or its container or elements embodied therein, form the secondary of a transformer - H05B 6/36: Coil arrangements - H05B 6/40: Establishing desired heat distribution, e.g. to heat particular parts of workpieces - H05B 6/44: having more than one coil or coil segment - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B) - F27B: FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS - F27D: DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE ## Abstract An induction heating device for a metal strip includes a first induction coil member and a second induction coil member provided in parallel with a metal strip across the metal strip that travels in a longitudinal direction, provided to protrude from the metal strip, and provided so as not to overlap each other in the traveling direction of the metal strip, and a magnetic core member provided between the first induction coil member and the second induction coil member, and provided to cover a large area of an end portion in the sheet width direction of the metal strip on the side of each of the first induction coil member and the second induction coil member, and cover a small area of the end at a center portion between the first induction coil member and the second induction coil member. ## Claims ### Claim 1 An induction heating device for a metal strip, comprising: an induction coil including: a first induction coil member and a second induction coil member that are provided in parallel with a metal strip across the metal strip that travels in a longitudinal direction thereof, that are provided such that both ends of each of the first induction coil member and the second induction coil member protrude from the traveling metal strip in a sheet width direction of the traveling metal strip, and that are arranged such that vertical projection images thereof onto the traveling metal strip do not overlap each other in a traveling direction in which the metal strip travels; a first electrical connector for electrically connecting one of both ends of the first induction coil member and one of both ends of the second induction coil member; and a second electrical connector for electrically connecting another one of the both ends of the first induction coil member and another one of the both ends of the second induction coil member; a first magnetic core including: a first magnetic core member provided between the first induction coil member and the second induction coil member in the traveling direction, the first magnetic core member being provided on one of surface sides of the traveling metal strip and covering a large area of one end portion in the sheet width direction of the traveling metal strip, the large area being on a side of each of the first induction coil member and the second induction coil member, and covering a small area of the one end portion at a center portion between the first induction coil member and the second induction coil member; and a second magnetic core member provided between the first induction coil member and the second induction coil member in the traveling direction, the second magnetic core member being provided on another one of the surface sides opposite from the one of the surface sides of the traveling metal strip and covering a large area of the one end portion in the sheet width direction of the traveling metal strip, the large area being on the side of each of the first induction coil member and the second induction coil member, and covering a small area of the one end portion at the center portion between the first induction coil member and the second induction coil member; and a second magnetic core including: a third magnetic core member provided between the first induction coil member and the second induction coil member in the traveling direction, the third magnetic core member being provided on the one of the surface sides of the traveling metal strip and covering a large area of another end portion opposite from the one end portion in the sheet width direction of the traveling metal strip, the large area being on the side of each of the first induction coil member and the second induction coil member, and covering a small area of the another end portion at the center portion between the first induction coil member and the second induction coil member; and a fourth magnetic core member provided between the first induction coil member and the second induction coil member in the traveling direction, the fourth magnetic core member being provided on the another one of the surface sides of the traveling metal strip and covering a large area of the another end portion in the sheet width direction of the traveling metal strip, the large area being on the side of each of the first induction coil member and the second induction coil member, and covering a small area of the another end portion at the center portion between the first induction coil member and the second induction coil member. ### Claim 2 (depends on 1) The induction heating device for a metal strip according to claim 1, wherein the first induction coil member is provided on the one of the surface sides of the traveling metal strip, and the second induction coil member is provided on the another one of the surface sides of the traveling metal strip. ### Claim 3 (depends on 1) The induction heating device for a metal strip according to claim 1, further comprising a second induction coil including: a third induction coil member and a fourth induction coil member that are provided in parallel with the metal strip across the metal strip that travels in the longitudinal direction thereof, that are provided such that both ends of each of the third induction coil member and the fourth induction coil member protrude from the traveling metal strip in the sheet width direction of the traveling metal strip, and that are arranged such that vertical projection images thereof onto the traveling metal strip do not overlap each other in the traveling direction in which the metal strip travels; a third electrical connector for electrically connecting one of both ends of the third induction coil member and one of both ends of the fourth induction coil member; and a fourth electrical connector for electrically connecting another one of the both ends of the third induction coil member and another one of the both ends of the fourth induction coil member, wherein vertical projection images of the first induction coil member and the third induction coil member onto the traveling metal strip overlap each other in the traveling direction in which the metal strip travels, and vertical projection images of the second induction coil member and the fourth induction coil member onto the traveling metal strip overlap each other in the traveling direction in which the metal strip travels, and wherein the first induction coil member and the second induction coil member are provided on the one of the surface sides of the traveling metal strip, and the third induction coil member and the fourth induction coil member are provided on the another one of the surface sides of the traveling metal strip. ### Claim 4 (depends on 1) The induction heating device for a metal strip according to claim 1, wherein the first magnetic core member and the second magnetic core member each are divided into a same number of a plurality of members in the traveling direction, and the plurality of divided first magnetic core members and the plurality of divided second magnetic core members are arranged such that vertical projection images of the divided first magnetic core members and vertical projection images of the divided second magnetic core members onto the traveling metal strip respectively overlap each other in the traveling direction in which the metal strip travels, and the third magnetic core member and the fourth magnetic core member each are divided into a same number of a plurality of members in the traveling direction, and the plurality of divided third magnetic core members and the plurality of divided fourth magnetic core members are arranged such that vertical projection images of the divided third magnetic core members and vertical projection images of the divided fourth magnetic core members onto the traveling metal strip respectively overlap each other in the traveling direction in which the metal strip travels. ### Claim 5 (depends on 4) The induction heating device for a metal strip according to claim 4, further comprising: a moving mechanism configured to move each of the divided plurality of members of the first magnetic core member and the second magnetic core member, and each of the divided plurality of members of the third magnetic core member and the fourth magnetic core member in the sheet width direction of the traveling metal strip. ### Claim 6 (depends on 2) The induction heating device for a metal strip according to claim 2, further comprising: a second induction coil having a structure identical to a structure of the induction coil; a third magnetic core having a structure identical to a structure of the first magnetic core; and a fourth magnetic core having a structure identical to a structure of the second magnetic core, wherein the induction coil and the second induction coil are arranged in parallel in the traveling direction.