WO2014049999A1 - Heating device for stress relief - Google Patents

Heating device for stress relief Download PDF

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Publication number
WO2014049999A1
WO2014049999A1 PCT/JP2013/005402 JP2013005402W WO2014049999A1 WO 2014049999 A1 WO2014049999 A1 WO 2014049999A1 JP 2013005402 W JP2013005402 W JP 2013005402W WO 2014049999 A1 WO2014049999 A1 WO 2014049999A1
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WO
WIPO (PCT)
Prior art keywords
coil
heating
steel plate
strain relief
heating coil
Prior art date
Application number
PCT/JP2013/005402
Other languages
French (fr)
Japanese (ja)
Inventor
博隆 吉田
淳一 鍬本
Original Assignee
第一高周波工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=50387100&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2014049999(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by 第一高周波工業株式会社 filed Critical 第一高周波工業株式会社
Priority to JP2014538144A priority Critical patent/JP6246723B2/en
Priority to KR1020157002071A priority patent/KR102034734B1/en
Priority to CN201380041742.2A priority patent/CN104661789B/en
Publication of WO2014049999A1 publication Critical patent/WO2014049999A1/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • H05B6/44—Coil arrangements having more than one coil or coil segment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/30—Stress-relieving
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • H05B6/103—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor
    • H05B6/104—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor metal pieces being elongated like wires or bands
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the present invention relates to a strain relief heating device, and more particularly, to a strain relief heating device used for removing strain of a steel sheet by performing high-frequency induction heating on the steel sheet.
  • steel plates are often assembled by welding.
  • the end of another steel plate P2 that supports the steel plate P1 is in vertical contact with the back side of the steel plate P1 that forms the deck. And the contact part is welded (see symbols W1 and W2).
  • the steel plates P1 and P2 are assembled with the welding materials W1 and W2 as described above, a problem arises in that the welded portion is distorted and the steel plate P1 is deformed.
  • Patent Document 1 discloses a strain relief heating device equipped with an induction heating coil using high-frequency current.
  • the distortion removal heating device is caused to travel along the welding location while supplying a high-frequency current to the induction heating coil of the distortion removal heating device, whereby the welding location is induction-heated to remove the distortion generated in the steel plate.
  • the induction heating coil since the induction heating coil is disposed close to the steel plate to be heated, the heating of the steel plate becomes local. .
  • the heating coil portions 111 and 112 of the substantially U-shaped induction heating coil 110 as shown in FIG. 2A are arranged close to the surface side of the steel plate as shown in FIG.
  • the steel plate P1 is induction heated by a magnetic field generated around the heating coil portions 111 and 112 by the high frequency current.
  • only the surface side of the steel plate P1 is locally heated, as indicated by the symbol A in FIG.
  • the induction heating coil disclosed in Patent Document 2 includes a fifth conductive part (22) and a ninth conductive part (30) facing the object to be heated, and the object to be heated is more than these conductive parts (22, 30).
  • a third conductive portion (18) is arranged in parallel at a distant position.
  • the seventh conductive part (26) located on the ninth conductive part (30) side is located in the same height direction as the fifth conductive part (22) and the ninth conductive part (30). It is arranged close to the object to be heated. For this reason, this coil is useful for simultaneously heating the entire surface of the object to be heated by induction heating. When using for heating from the surface side in order to remove, problems arise.
  • the induction heating coil disclosed in Patent Document 3 includes a large-diameter high-frequency magnetic field generating coil (1) and a small-diameter second high-frequency magnetic field generating coil (2), and has a small diameter relative to the heat generating member (7).
  • Two high frequency magnetic field generating coils (2) are arranged at close positions.
  • the first high-frequency magnetic field generating coil (1) and the second high-frequency magnetic field generating coil (2) are arranged so as to overlap in the vicinity of the center, so that the heat generating member (7) is excessively heated. Problem arises.
  • an object of the present invention is to provide a heating apparatus that can perform induction heating appropriately without excessively heating a plate material, which is the above-described problem.
  • a strain relief heating apparatus is provided.
  • a heating apparatus for strain relief that removes distortion of the steel sheet due to welding by heating a steel sheet on which a part of the back side to be heated is welded from the front side.
  • a first coil portion and a second coil portion that are arranged to face the surface of the steel plate and induction-heat the steel plate by flowing a supplied high-frequency current,
  • the first coil portion is disposed in contact with or close to the surface of the steel plate
  • the second coil portion is disposed away from the surface of the steel plate by a predetermined distance from the first coil portion, and is disposed away from the distance of the first coil portion relative to the surface of the steel plate.
  • the opposing portion of the steel plate is determined by the high-frequency current flowing in each coil portion. Induction heating can be performed from the surface side. At this time, since the first coil portion is disposed in contact with or close to the surface of the steel plate, the portion facing the steel plate is locally heated. In addition to this, since the second coil portion is arranged farther from the surface of the steel plate than the first coil portion, the periphery of the opposing portion of the steel plate that is locally heated by the first heating coil. Although the heating strength is weak, induction heating can be performed over a wide range.
  • the steel plate to be heated can be heated over a wide range centering on the location facing the first coil portion so that the heating intensity gradually increases from the peripheral side toward the center.
  • the vicinity of the facing portion can be efficiently heated while suppressing excessive heating around the facing portion of the first coil portion.
  • the back surface side near the opposing location of the 1st coil part can also be heated efficiently, and the distortion removal by the welding performed on the said back surface side can be performed efficiently.
  • the second coil part is arranged so that the first coil part itself is sandwiched around the first coil part that is separated from the first coil part by a predetermined distance. It is located on both sides of the.
  • the second coil part is more than the distance from the surface of the steel sheet to the middle point between the part of the first coil part facing the surface of the steel sheet and the part farthest from the surface of the steel sheet, Arranged at a position away from the surface of the steel sheet, Take the configuration.
  • a 2nd coil part can be arrange
  • the first coil portion and the second coil portion are each formed in a linear shape extending along the surface of the steel plate, and are disposed substantially parallel to each other. Take the configuration.
  • the vicinity of the welded portion can be efficiently heated as described above, and distortion can be removed. Work can be performed efficiently.
  • the first coil portion and the second coil portion that are arranged adjacent to each other are formed such that current flows in opposite directions to each other.
  • the first coil part and the second coil part are formed by one coil connected to each other, Take the configuration.
  • the first coil portion and the second coil portion are formed by one coil connected to each other, and the coil is formed by being wound in a spiral shape,
  • the first coil part is located on the inner side of the spiral coil, and the second coil part is located on the outer peripheral side of the spiral coil.
  • the heating apparatus for strain relief It is arranged opposite to the surface of the steel plate, further comprising a cooling part for cooling the steel plate,
  • the cooling unit is disposed on both sides of the first coil unit so as to sandwich at least the first coil unit around the first coil unit. Take the configuration.
  • the cooling part is located at a side away from the second coil part by a predetermined distance, on the side opposite to the first coil part side, and is arranged so as to sandwich the first coil part. Arranged to further sandwich the second coil part, Take the configuration.
  • the cooling part is disposed at least with respect to the surface of the steel sheet, at a distance greater than the distance of the first coil part with respect to the surface of the steel sheet, and from the portion facing the surface of the steel sheet to the surface of the steel sheet. It is configured to cool the steel sheet by discharging the cooling material toward the Take the configuration.
  • the steel sheet is centered on the opposite part of the first coil part. As described above, it can be heated in a wide range, and excessive heating of the outside can be suppressed.
  • the first coil part, the second coil part, and the cooling part are each formed in a straight line extending along the surface of the steel sheet, and are arranged substantially in parallel. It is good also as a structure of.
  • the first coil portion and the second coil portion are formed by one coil connected to each other, and the coil is formed by being wound in a spiral shape,
  • the first coil part is located on the inner side of the spiral coil, and the second coil part is located on the outer peripheral side of the spiral coil,
  • the cooling unit is located at a predetermined distance away from the second coil unit and further outside the second coil unit, and is disposed surrounding the second coil unit. It is good also as a structure of.
  • the heating apparatus which is the other form of this invention, It is arranged opposite to the surface of the plate material to be heated, and includes a first coil portion and a second coil portion that inductively heat the plate material when the supplied high-frequency current flows,
  • the first coil portion is disposed in contact with or close to the surface of the plate material
  • the second coil portion is disposed away from the surface of the plate material by a predetermined distance from the surface of the plate material, and further away from the first coil portion.
  • Arranged around the first coil part, and further, located on both sides of the first coil part so as to sandwich the first coil part Take the configuration.
  • the heating device It is arranged facing the surface of the plate material, and includes a cooling unit that cools the plate material,
  • the cooling unit is disposed on both sides of the first coil unit so as to sandwich at least the first coil unit around the first coil unit. Take the configuration.
  • the present invention can be used not only for the purpose of taking distortion of a steel plate caused by welding, but also for induction heating of a plate material for other purposes, centering on the opposite part of the first coil part.
  • the steel sheet can be heated more appropriately over a wide range and evenly without excessive heating.
  • the present invention is configured as described above, whereby the plate material can be efficiently induction-heated.
  • FIG. 1 It is a figure which shows an example of the steel plate used as the heating object by the heating apparatus for distortion removal of this invention. It is a figure which shows an example of a structure of the heating apparatus for distortion removal relevant to this invention. It is a figure which shows the structure of the heating apparatus for distortion removal which is this invention. It is a figure which shows the structure of the heating apparatus for distortion removal which is this invention. It is a figure which shows the structure of the heating coil of the heating apparatus for distortion removal in Embodiment 1. FIG. It is a figure which shows the structure at the time of the heating coil of the heating apparatus for distortion removal in Embodiment 1, and the mode at the time of a heating. It is a figure which shows the structure of the heating coil of the heating apparatus for distortion removal in Embodiment 2. FIG.
  • FIGS. 3 to 4 are diagrams showing a configuration of a strain relief heating apparatus according to the present invention
  • FIGS. 5 to 6 are diagrams showing a configuration of a coil constituting the strain relief heating apparatus and a state during heating. It is.
  • FIG. 3 shows a front view of the strain relief heating apparatus 1
  • FIG. 4 shows a bottom view thereof. 3 and 4, the configuration of the strain relief heating apparatus 1 is shown in a simplified manner.
  • the distortion removing heating device 1 is provided with a wheel 3 on a main body 2 and a hand pushing portion 4 extending upward from the main body 2. Thereby, it is comprised so that a worker can drive
  • the steel plate P1 to be heated is, for example, a flat steel plate P1 having a predetermined thickness that forms the deck of a ship, and the steel plate P1 is formed on the back side.
  • the other steel plate P2 to be supported is assembled in such a manner that the end portions of the steel plate P2 are in contact with each other vertically and welded.
  • the heating apparatus 1 for distortion removal is used so that the distortion of the steel plate P1 which arose by welding may be removed by heating the welding location of the back surface side of the steel plate P1 from the surface side of the said steel plate P1.
  • the welding location of the steel plate P1 is located continuously or intermittently in a straight line along the end portion of the other steel plate P2 that abuts on the back surface side.
  • the heating apparatus 1 for distortion removal is run along the welding location located in this linear form, and the operation
  • the strain relief heating apparatus 1 is configured to be able to travel, but is not necessarily limited to being capable of traveling.
  • the heating apparatus 1 for distortion removal is equipped with the heating coil 10 arrange
  • the heating coil 10 according to the present embodiment has three linear coil portions 11, 12a, and 12b that are arranged in parallel with each other in the longitudinal direction along the traveling direction. It is formed in the shape to have.
  • a specific configuration of the heating coil 10 in the present embodiment will be described with reference to FIGS. 5 and 6.
  • a power supply, an amplification transformer, and the like are also provided, but description of such a configuration is omitted.
  • FIG. 5 is a perspective view showing the configuration of the heating coil 10.
  • the heating coil 10 has two input ends 13 and 14 which are located on one end side and to which a high-frequency current is supplied, and three linear coil portions 11, 12a and 12b. Configured. These three linear coil portions 11, 12a, 12b are all connected and formed as one coil, and are configured such that a high-frequency current supplied from the input ends 13, 14 flows.
  • the heating coil 10 is formed of a tubular member made of copper and having a hollow inside, and is configured such that cooling water flows therein (see FIG. 6A).
  • the main heating coil part 11 (first coil part) located in the center has one end connected to the input end indicated by reference numeral 13, and the other end side It is connected to the other two coil portions 12a and 12b. And the main heating coil part 11 is arrange
  • the main heating coil part 11 since the heat-resistant sheet
  • auxiliary heating coil portions 12a and 12b (second coil portions), which are the other two coil portions 12a and 12b, are parallel to the main heating coil portion 11 and at a predetermined distance from the main heating coil portion 11. Are only placed around the perimeter. Specifically, the two auxiliary heating coil portions 12a and 12b are arranged so as to sandwich the main heating coil portion 11 from both sides. The two auxiliary heating coil portions 12a and 12b have one end connected to the other input end 14 and the other end connected to the auxiliary heating coil portions 12a and 12b and the main heating coil portion 1. Has been. That is, the other end side of the heating coil 10 is configured by connecting three coil portions 11, 12a, 12b.
  • the two auxiliary heating coil portions 12a and 12b are disposed away from the main heating coil portion 11 with respect to the surface of the steel plate P1. That is, the distance from the surface of the steel plate P1 to the opposing surfaces of the auxiliary heating coil portions 12a and 12b facing the surface is larger than the distance from the surface of the steel plate P1 to the opposing surface of the main heating coil portion 11 facing the surface.
  • the auxiliary heating coil portions 12a and 12b are arranged so as to be longer.
  • the auxiliary heating coil portions 12a and 12b in the present embodiment are arranged so as to be positioned above the upper end of the main heating coil portion 11 with respect to the surface of the steel plate P1.
  • the distance from the surface of the steel plate P1 to the opposing surfaces of the auxiliary heating coil portions 12a and 12b facing the surface is the upper end (the steel plate) of the main heating coil portion 11 farthest from the surface of the steel plate P1 with respect to the surface.
  • the auxiliary heating coil portions 12a and 12b are arranged so as to be longer than the distance to the surface on the opposite side to the surface facing P1.
  • auxiliary heating coil portions 12a and 12b are not limited to being positioned above the upper end of the main heating coil portion 11 with respect to the surface of the steel plate P1 as shown in FIG. What is necessary is just to be located away from the surface of the steel plate P1 rather than the part 11.
  • a distance D1 (see FIG. 6A) from the surface of the steel plate P1 to the auxiliary heating coil portions 12a and 12b is at least a portion facing the surface of the steel plate P1 of the main heating coil portion 11 from the surface of the steel plate P1.
  • a distance D2 (see FIG. 6A) to an intermediate point between the most distant portion (upper end) with respect to the surface of the steel plate P1 may be set.
  • the three coil parts 11, 12a, and 12b are mounted in the heating apparatus 1 for distortion removal in the state enclosed by the core member 15. .
  • the core member 15 is for concentrating the magnetic flux generated by flowing a high-frequency current through the coil portions 11, 12a, 12b in the heating portion.
  • the steel plate P1 By supplying a high-frequency current to the heating coil 10 as described above, the steel plate P1 can be heated by induction heating from the surface side, as shown in FIG. 6B, by the magnetic field generated by the current.
  • the main heating coil portion 11 is disposed in contact with or close to the surface of the steel plate P1, and therefore, the portion facing the steel plate P1 can be locally heated with the same strength.
  • the auxiliary heating coil portions 12a and 12b are arranged farther from the surface of the steel plate P1 than the main heating coil portion 11, the auxiliary heating coil portions 12a and 12b of the steel plate P1 locally heated by the main heating coil portion 11 are arranged.
  • the surroundings of the facing portion can be induction-heated over a wide range although the heating intensity is weak. For this reason, it is possible to heat the steel sheet P1 in a wide range centering on the portion facing the main heating coil section 11 so that the heating intensity gradually increases from the outside toward the center.
  • the vicinity of the facing portion can be efficiently heated while suppressing excessive heating around the facing portion of the main heating coil portion 11 of the steel plate P1.
  • the back surface side near the opposite location of the main heating coil part 11 can also be efficiently heated, and the distortion can be efficiently removed by welding (reference characters W1, W2) performed on the back surface side.
  • the steel plate P1 can be induction-heated more efficiently.
  • FIG. 7 to FIG. 8 are diagrams showing the configuration of the heating coil that constitutes the strain-relieving heating apparatus according to this embodiment and the state during heating.
  • the strain relief heating device 1 in the present embodiment is substantially the same as the configuration of the first embodiment described above, but the configuration of the heating coil 20 provided on the lower surface side of the device 1 itself for heating the steel plate 1 is different.
  • the heating coil 20 in the present embodiment is formed in a shape having four linear coil portions 21a, 21b, 22a, and 22b that extend along the traveling direction and are arranged in parallel to each other.
  • FIGS. 7 and 8 a specific configuration of the heating coil 20 in the present embodiment will be described with reference to FIGS. 7 and 8.
  • FIG. 7 is a perspective view showing the configuration of the heating coil 20.
  • the heating coil 20 includes two input ends 23 and 24, which are located on one end side and to which a high-frequency current is input, and four linear coil portions 21a, 21b, 22a and 22b. It is configured. These four linear coil portions 21a, 21b, 22a, and 22b are all connected and formed as one coil, and are configured such that a high-frequency current supplied from the input ends 23 and 24 flows.
  • the heating coil 20 is made of copper, and is formed of a hollow tubular member. The cooling water flows inside the heating coil 20 (see FIG. 8A).
  • coil parts 21a, 21b, 22a, and 22b are two main heating coil parts 21a and 21b (1st coil part) located inside, and two each located in those both outer sides, respectively.
  • auxiliary heating coil portions 22a and 22b second coil portions.
  • the two main heating coil parts 21a and 21b are arrange
  • the other two auxiliary heating coil portions 22a and 22b are arranged in parallel to the main heating coil portions 21a and 21b and around a predetermined distance from the main heating coil portions 21a and 21b.
  • the two auxiliary heating coil portions 22a and 22b are arranged so as to sandwich the two main heating coil portions 21a and 22a from both sides.
  • the two auxiliary heating coil portions 22a and 22b are disposed away from the main heating coil portions 21a and 21b with respect to the surface of the steel plate P1. That is, the distance from the surface of the steel plate P1 to the opposing surface of the auxiliary heating coil portions 22a and 22b facing the surface is the distance from the surface of the steel plate P1 to the opposing surface of the main heating coil portions 21a and 21b facing the surface.
  • the auxiliary heating coil portions 22a and 22b are arranged so as to be longer.
  • the four coil parts 21a, 21b, 22a, and 22b are mounted in the distortion removal heating apparatus 1 in the state surrounded by the core member. Yes.
  • the four coil portions 21a and 21b are in a state where current flows through the input ends 23 and 24 as indicated by arrows in FIG. , 22a and 22b, currents flow in the directions of the arrows in FIG.
  • the main heating coil portion 21a and the auxiliary heating coil portion 22a arranged adjacent to each other, or the main heating coil portion 21b and the auxiliary heating coil portion 22b currents flow in opposite directions to each other.
  • the steel plate P1 By supplying the high-frequency current to the heating coil 20 as described above, the steel plate P1 can be heated by induction heating from the surface side as shown in FIG. 8B by the magnetic field generated by the current.
  • the main heating coil portions 21a and 21b are disposed in contact with or close to the surface of the steel plate P1, and therefore, the portion facing the steel plate P1 can be locally heated.
  • the auxiliary heating coil portions 22a and 22b are arranged farther from the surface of the steel plate P1 than the main heating coil portions 21a and 21b, they are locally heated by the main heating coil portions 21a and 21b.
  • the periphery of the facing portion of the steel plate P1 can be induction-heated over a wide range although the heating strength is weak. For this reason, it is possible to heat the steel plate P1 in a wide range centering on the opposed portions of the main heating coil portions 21a and 21b so that the heating intensity gradually increases from the outside toward the center.
  • FIG. 9 is a diagram showing a configuration of a heating coil that constitutes the strain relief heating device in the present embodiment
  • FIG. 9A is a plan view
  • FIG. 9B is a cross-sectional view in the vicinity of the center. .
  • the strain relief heating device 1 in the present embodiment is substantially the same as the configuration of the first embodiment described above, but the configuration of the heating coil 30 provided on the lower surface side of the device 1 itself for heating the steel plate 1 is different.
  • the heating coil 30 in the present embodiment is the same in that it is composed of a tubular member formed of copper, but as shown in FIG. 9A, one coil member is spirally formed. It is formed by winding.
  • the main heating coil portion 31 located near the center (inside) of the spiral heating coil 30 approaches (or contacts) the surface of the steel plate P1 to be heated. Arranged so that. Further, as shown in FIG. 9B, the auxiliary heating coil part 32 located near the outer periphery of the heating coil 30 (outer peripheral side), that is, around the main heating coil part 31, is arranged on the surface of the steel plate P1. The heating coil unit 31 is arranged away from the heating coil unit 31.
  • the steel plate P1 is spread over a wide range centering on the opposite location of the main heating coil portion 31 as in the other embodiments described above, and from the outside to the center. Heating can be performed so that the heating intensity gradually increases. As a result, the vicinity of the facing portion can be efficiently heated while suppressing excessive heating around the facing portion of the main heating coil portion 31 of the steel plate P1.
  • FIGS. 10 to FIG. 12 are diagrams showing the configuration of the heating coil that constitutes the strain relief heating apparatus in this embodiment and the state during heating.
  • the strain relief heating device 1 in the present embodiment further includes two cooling units 26a and 26b. As shown in FIG. 10, the cooling portions 26a and 26b are formed in a linear shape, and are parallel to the four linear coil portions 21a, 21b, 22a and 22b extending along the traveling direction as described above. Has been placed.
  • the two cooling units 26a and 26b are arranged around a predetermined distance from the two auxiliary heating coil units 22a and 22b, on the side opposite to the arrangement side of the main heating coil units 21a and 21b. Has been placed.
  • the two cooling parts 26a and 26b are arranged so as to sandwich the two auxiliary heating coil parts 22a and 22b from both sides.
  • the two cooling parts 26a and 26b are separated from the main heating coil parts 21a and 21b with respect to the surface of the steel plate P1, and are also provided with respect to the surface of the steel plate P1.
  • the auxiliary heating coil portions 22a and 22b are arranged at substantially the same distance.
  • the distance of the cooling parts 26a and 26b with respect to the surface of the steel plate P1 may be any distance.
  • the cooling units 26a and 26b are made of, for example, copper, and as shown in FIG. And it is comprised so that the water for cooling the steel plate P1 may flow inside the cooling units 26a and 26b. Such water is supplied through support pipes 27a and 27b connected to the cooling units 26a and 26b.
  • cooling portions 26a and 26ba communicating from the inside to the outside are formed in the respective cooling portions 26a and 26b at locations facing the surface of the steel plate P1. From these through holes 26aa and 26ba, water flowing inside the cooling portions 26a and 26b is discharged toward the surface of the steel plate P1, as indicated by reference numerals 28a and 28b in FIG.
  • emitted from cooling part 26a, 26b is not limited to water, What is necessary is just a coolable substance, such as compressed air and water vapor
  • the cooling pipes 26a and 26b may be connected to the coil portions 21a, 21b, 22a, and 22b described above, and water flowing in the coil portions may be supplied to the cooling portions 26a and 26b.
  • the operation when supplying a high-frequency current to the heating coil 20 will be described with reference to FIGS.
  • the steel sheet P1 can be heated from the surface side by induction heating with a magnetic field generated by the current, as shown in FIG.
  • the main heating coil portions 21a and 21b are disposed in contact with or close to the surface of the steel plate P1, and therefore, the portion facing the steel plate P1 can be locally heated.
  • the auxiliary heating coil portions 22a and 22b are arranged farther from the surface of the steel plate P1 than the main heating coil portions 21a and 21b, they are locally heated by the main heating coil portions 21a and 21b.
  • the periphery of the facing portion of the steel plate P1 can be induction-heated over a wide range although the heating strength is weak.
  • the heating point A3 of the steel plate P1 by the heating coil 20 described above is in a wide range as indicated by the oblique lines in FIG. 11B, but thermal expansion occurs in such a range. Then, not only the back surface side near the opposing location of the main heating coil portions 21a and 21b, but also the surroundings, for example, the opposing location with the auxiliary heating coil portions 22a and 22b and the cooling portions 26a and 26b, thermal expansion occurs due to heating, If the steel plate P1 is cooled later, unnecessary deformation may occur.
  • the steel plate P1 can be heated so that the heating intensity gradually increases from the outside toward the center over a wide range centering on the opposed portions of the main heating coil portions 21a and 21b. At the same time, excessive heating outside can be suppressed. As a result, distortion can be efficiently removed by welding (reference characters W1, W2) performed on the back side of the steel plate P1, and excessive heating of the steel plate P1 can be suppressed and unnecessary deformation can be prevented.
  • cooling units 26a and 26b may be mounted on the auxiliary heating coil units 22a and 22b. That is, as shown in FIG. 13A, through holes 22aa and 22ba are formed on the surfaces of the auxiliary heating coil portions 22a and 22b facing the steel plate P1, and water flowing inside the auxiliary heating coils 22a and 22b is shown in FIG. You may discharge
  • the auxiliary heating coil portions 22a and 22b that also function as a cooling portion are disposed so as to sandwich at least the main heating coil portions 21a and 21b, so that the opposite portions of the main heating coil portions 21a and 21b are centered as described above.
  • the auxiliary heating coil portions 22a and 22b can be heated so that the heating intensity gradually increases from the outside toward the center, and further, excessive heating outside can be suppressed by the cooling function. .
  • FIG. 14 is a diagram showing the configuration of the heating coil that constitutes the strain relief heating device in the present embodiment
  • FIG. 14A is a plan view
  • FIG. 14B is a cross-sectional view in the vicinity of the center. .
  • the strain relief heating device 1 in the present embodiment further includes a cooling unit 33 having the same function as that described in the fourth embodiment on the outermost periphery.
  • the heating coil 30 in the present embodiment is formed by winding one coil member in a spiral shape.
  • the main heating coil part 31 located in the center vicinity (inner side) of the spiral heating coil 30 approaches (or contacts) the surface of the steel plate P1 to be heated as shown in FIG. 14B.
  • the auxiliary heating coil part 32 located near the outer periphery of the heating coil 30 (on the outer peripheral side), that is, around the main heating coil part 31, is, as shown in FIG.
  • the heating coil unit 31 is arranged away from the heating coil unit 31.
  • the auxiliary heating coil portion 32 is further away from the auxiliary heating coil portion 32 by a predetermined distance, surrounds the auxiliary heating coil portion 32, and a through hole (not shown) is formed on the surface facing the steel plate P1.
  • An annular cooling part 33 is provided. Water flows inside the cooling section 33, and water is discharged from the through hole toward the steel plate P1.
  • the heating intensity of the steel plate P1 is gradually increased from the outside toward the center in a wide range with the main heating coil part 31 and the auxiliary heating coil part 32 as the center, at the location facing the main heating coil part 31. It can be heated.
  • the outermost peripheral side is cooled by a cooling substance such as water discharged from the cooling unit 33, excessive heating on the outside can be suppressed, and unnecessary deformation of the steel sheet P1 due to thermal expansion can be prevented. can do.
  • the cooling unit 33 may be formed by connecting the main heating coil unit 31 and the auxiliary heating coil unit 32 and winding one coil member in a spiral shape. In this case, the water discharged from the cooling unit 33 is the same as that flowing through the main heating coil unit 31 and the auxiliary heating coil unit 32. Further, a through hole may be formed in the auxiliary heating coil part 32, and the function of the cooling part 33 may be provided in the auxiliary heating coil part 32.
  • the heating coil has been described as having a linear portion.
  • the main heating coil portion and the auxiliary heating coil portion that constitute the heating coil may not be linear. It may be a curved shape.
  • the heating coil unit 30 described in the third embodiment is not limited to a substantially rectangular spiral shape, and may be a circular spiral shape.
  • the shape of the heating coil may be any shape.
  • a cooling part may not be a linear shape, and a curve shape may be sufficient as it.
  • the said embodiment demonstrated the structure as a heating apparatus used in order to remove the distortion produced by welding, such as a steel plate for ships, the said heating apparatus is not necessarily limited to being used only for removing a distortion.
  • the heating device including the heating coil as described above may be used to heat a member to be heated for any purpose, such as heating a metal member for bending.

Abstract

The present invention provides a first coil part and second coil parts disposed facing the surface of a steel plate and adapted for induction-heating the steel plate through the flow of a supplied high-frequency electrical current. The first coil part is disposed in contact with or in proximity to the surface of the steel plate. The second coil parts are disposed further away from the surface of the steel plate than the first coil part is from the surface of the steel plate, are disposed around the first coil part at a prescribed distance therefrom, and are disposed at positions on both sides of the first coil part so that the first coil part is interposed therebetween. By adopting this constitution, induction heating can be carried out without causing overheating of the plate.

Description

歪み取り用加熱装置Heating device for strain relief
　本発明は、歪み取り用加熱装置にかかり、特に、鋼板に対して高周波誘導加熱を行うことにより当該鋼板の歪みを取るために用いる歪み取り用加熱装置に関する。 The present invention relates to a strain relief heating device, and more particularly, to a strain relief heating device used for removing strain of a steel sheet by performing high-frequency induction heating on the steel sheet.
　船舶などの鉄鋼構造物を製造する際には、鋼板を溶接して組み立てられることが多々ある。例えば、船舶の甲板は、図１（Ａ），（Ｂ）に示すように、甲板を形成する鋼板Ｐ１の裏面側に、当該鋼板Ｐ１を支持する他の鋼板Ｐ２の端部が垂直に当接して組み付けられ、当接箇所が溶接されることで形成される（符号Ｗ１，Ｗ２参照）。ところが、このように溶接材料Ｗ１，Ｗ２にて鋼板Ｐ１，Ｐ２が組み付けられると、かかる溶接箇所に歪みが生じ、鋼板Ｐ１が変形するといった問題が生じる。 When manufacturing steel structures such as ships, steel plates are often assembled by welding. For example, as shown in FIGS. 1 (A) and 1 (B), the end of another steel plate P2 that supports the steel plate P1 is in vertical contact with the back side of the steel plate P1 that forms the deck. And the contact part is welded (see symbols W1 and W2). However, when the steel plates P1 and P2 are assembled with the welding materials W1 and W2 as described above, a problem arises in that the welded portion is distorted and the steel plate P1 is deformed.
　上述した問題が生じるため、鉄鋼構造物を製造する際には、溶接箇所を溶接後に再度加熱して、歪みを除去することが行われる。例えば、特許文献１に示す例では、高周波電流による誘導加熱コイルを搭載した歪み取り加熱装置が開示されている。この歪み取り加熱装置の誘導加熱コイルに高周波電流を供給しながら当該歪み取り加熱装置を溶接箇所に沿って走行させることで、当該溶接箇所が誘導加熱され、鋼板に生じた歪みを取り除いている。 Since the above-mentioned problems occur, when manufacturing a steel structure, the welded portion is heated again after welding to remove the distortion. For example, the example shown in Patent Document 1 discloses a strain relief heating device equipped with an induction heating coil using high-frequency current. The distortion removal heating device is caused to travel along the welding location while supplying a high-frequency current to the induction heating coil of the distortion removal heating device, whereby the welding location is induction-heated to remove the distortion generated in the steel plate.
特開平１１－１７００８１号公報Japanese Patent Laid-Open No. 11-170081 特開２０００－１２２０５号公報Japanese Patent Laid-Open No. 2000-12205 特開平４－２３２７９１号公報Japanese Laid-Open Patent Publication No. 4-232791
　しかしながら、上述した特許文献１に開示の誘導加熱コイルを用いた歪み取り加熱装置では、当該誘導加熱コイルを加熱対象となる鋼板に近接して配置するため、鋼板の加熱が局所的となってしまう。例えば、図２（Ａ）に示すような略Ｕ字状の誘導加熱コイル１１０の加熱コイル部１１１，１１２を、図２（Ｂ）に示すように鋼板の表面側に近接配置して、誘導加熱コイル１１０に高周波電流を供給した場合には、当該高周波電流によって加熱コイル部１１１，１１２の周りに生じた磁界により鋼板Ｐ１が誘導加熱される。ところが、かかる場合には、図２（Ｂ）の符号Ａに示すように、鋼板Ｐ１の表面側のみが局所的に加熱されることとなる。すると、誘導加熱コイル１１０を近接させている鋼板Ｐ１の表面側とは反対側に位置する裏面側の溶接材料Ｗ１，Ｗ２に隣接する部位に伝熱する間に、その周辺に熱が拡散してしまうため、効率的に歪みを取り除くことができない、という問題が生じる。そして、鋼板の歪みを取り除く目的で加熱する場合に限らず、別の目的で板材を高周波電流にて誘導加熱する作業においても、効率的に板材を加熱することができない、という問題が生じる。 However, in the strain relief heating apparatus using the induction heating coil disclosed in Patent Document 1 described above, since the induction heating coil is disposed close to the steel plate to be heated, the heating of the steel plate becomes local. . For example, the heating coil portions 111 and 112 of the substantially U-shaped induction heating coil 110 as shown in FIG. 2A are arranged close to the surface side of the steel plate as shown in FIG. When a high frequency current is supplied to the coil 110, the steel plate P1 is induction heated by a magnetic field generated around the heating coil portions 111 and 112 by the high frequency current. However, in such a case, only the surface side of the steel plate P1 is locally heated, as indicated by the symbol A in FIG. Then, while heat is transferred to the portion adjacent to the welding material W1, W2 on the back side, which is located on the opposite side to the surface side of the steel plate P1 with which the induction heating coil 110 is in close proximity, heat is diffused around the periphery. Therefore, there arises a problem that the distortion cannot be removed efficiently. And not only the case where it heats for the purpose of removing the distortion of a steel plate, but also in the operation | work which induction-heats a board | plate material with a high frequency current for another objective, the problem that a board | plate material cannot be heated efficiently arises.
　ここで、誘導加熱コイルに関する技術が、特許文献２，３に開示されている。特許文献２に開示の誘導加熱コイルは、被加熱物に対向する第５導電部（２２）及び第９導電部（３０）を配置し、これら導電部（２２，３０）よりも被加熱物から離れた位置に、平行に、第３導電部（１８）を配置して構成されている。ところが、かかる構成では、第９導電部（３０）側に位置する第７導電部（２６）が、上記第５導電部（２２）及び第９導電部（３０）と同じ高さ方向に位置しており、被加熱物に近接して配置されている。このため、このコイルは、誘導加熱の被加熱物の一面全体を同時に加熱することには有益であるが、加熱対象となる裏面側の一部が溶接された鋼板において、当該溶接による鋼板の歪みを取り除くために表面側からの加熱に用いる場合には問題が生じる。具体的に、特許文献２のコイルでは、第５導電部（２２）及び第９導電部（３０）付近が目的の加熱箇所である場合であっても、第７導電部（２６）付近も局所的に加熱してしまい、目的の加熱箇所以外の箇所を過度に加熱してしまう、という問題が生じる。 Here, technologies related to induction heating coils are disclosed in Patent Documents 2 and 3. The induction heating coil disclosed in Patent Document 2 includes a fifth conductive part (22) and a ninth conductive part (30) facing the object to be heated, and the object to be heated is more than these conductive parts (22, 30). A third conductive portion (18) is arranged in parallel at a distant position. However, in this configuration, the seventh conductive part (26) located on the ninth conductive part (30) side is located in the same height direction as the fifth conductive part (22) and the ninth conductive part (30). It is arranged close to the object to be heated. For this reason, this coil is useful for simultaneously heating the entire surface of the object to be heated by induction heating. When using for heating from the surface side in order to remove, problems arise. Specifically, in the coil of Patent Document 2, even if the vicinity of the fifth conductive portion (22) and the ninth conductive portion (30) is a target heating location, the vicinity of the seventh conductive portion (26) is also locally present. This causes a problem of heating up excessively and heating portions other than the target heating portion excessively.
　また、特許文献３に開示の誘導加熱コイルは、大径の高周波磁界発生コイル（１）及び小径の第２の高周波磁界発生コイル（２）を備え、発熱部材（７）に対して小径の第２の高周波磁界発生コイル（２）を近い位置に配置して構成されている。ところが、かかる構成では、第１の高周波磁界発生コイル（１）と第２の高周波磁界発生コイル（２）とが中心付近で重なって配置されているため、発熱部材（７）を過度に加熱してしまう、という問題が生じる。 The induction heating coil disclosed in Patent Document 3 includes a large-diameter high-frequency magnetic field generating coil (1) and a small-diameter second high-frequency magnetic field generating coil (2), and has a small diameter relative to the heat generating member (7). Two high frequency magnetic field generating coils (2) are arranged at close positions. However, in such a configuration, the first high-frequency magnetic field generating coil (1) and the second high-frequency magnetic field generating coil (2) are arranged so as to overlap in the vicinity of the center, so that the heat generating member (7) is excessively heated. Problem arises.
　このため、本発明の目的は、上述した課題である、板材を過度に加熱することなく、適度に誘導加熱することができる加熱装置を提供することにある。 For this reason, an object of the present invention is to provide a heating apparatus that can perform induction heating appropriately without excessively heating a plate material, which is the above-described problem.
　本発明の一形態である歪み取り用加熱装置は、
　加熱対象となる裏面側の一部が溶接された鋼板を表面側から加熱して、溶接による前記鋼板の歪みを取り除く歪み取り用加熱装置であって、
　前記鋼板の表面に対向して配置され、供給された高周波電流が流れることにより前記鋼板を誘導加熱する第一のコイル部と第二のコイル部とを備え、
　前記第一のコイル部は、前記鋼板の表面に接触あるいは近接して配置され、
　前記第二のコイル部は、前記鋼板の表面に対して、当該鋼板の表面に対する前記第一のコイル部の距離よりも離れて配置されると共に、前記第一のコイル部から所定の距離だけ離れた当該第一のコイル部の周囲に配置され、さらに、前記第一のコイル部を挟むよう当該第一のコイル部の両側方に位置して配置される、
という構成を取る。 A strain relief heating apparatus according to an aspect of the present invention is provided.
A heating apparatus for strain relief that removes distortion of the steel sheet due to welding by heating a steel sheet on which a part of the back side to be heated is welded from the front side.
A first coil portion and a second coil portion that are arranged to face the surface of the steel plate and induction-heat the steel plate by flowing a supplied high-frequency current,
The first coil portion is disposed in contact with or close to the surface of the steel plate,
The second coil portion is disposed away from the surface of the steel plate by a predetermined distance from the first coil portion, and is disposed away from the distance of the first coil portion relative to the surface of the steel plate. Arranged around the first coil part, and further, located on both sides of the first coil part so as to sandwich the first coil part,
Take the configuration.
　上記発明によると、まず、第一のコイル部及び第二のコイル部は、加熱対象となる鋼板の表面に対向して配置されているため、各コイル部に流れる高周波電流により鋼板の対向箇所を表面側から誘導加熱することができる。このとき、第一のコイル部は、鋼板の表面に接触あるいは近接して配置されているため、当該鋼板に対する対向箇所を局所的に加熱する。これに加え、第二のコイル部は、第一のコイル部よりも鋼板の表面から離れて配置されているため、第一の加熱コイルにて局所的に加熱される鋼板の対向箇所の周囲を、加熱強度は弱いものの広範囲に誘導加熱することができる。このため、加熱対象の鋼板を、第一のコイル部の対向箇所を中心として広範囲で、周囲側から中心に向かって徐々に加熱強度が強くなるよう加熱することができる。その結果、第一のコイル部の対向箇所の周囲において過度の加熱を抑制しつつ、当該対向箇所付近を効率的に加熱することができる。すると、第一のコイル部の対向箇所付近の裏面側も効率よく加熱することができ、当該裏面側で行われた溶接による歪みの除去を効率よく行うことができる。 According to the above invention, first, since the first coil portion and the second coil portion are disposed to face the surface of the steel plate to be heated, the opposing portion of the steel plate is determined by the high-frequency current flowing in each coil portion. Induction heating can be performed from the surface side. At this time, since the first coil portion is disposed in contact with or close to the surface of the steel plate, the portion facing the steel plate is locally heated. In addition to this, since the second coil portion is arranged farther from the surface of the steel plate than the first coil portion, the periphery of the opposing portion of the steel plate that is locally heated by the first heating coil. Although the heating strength is weak, induction heating can be performed over a wide range. For this reason, the steel plate to be heated can be heated over a wide range centering on the location facing the first coil portion so that the heating intensity gradually increases from the peripheral side toward the center. As a result, the vicinity of the facing portion can be efficiently heated while suppressing excessive heating around the facing portion of the first coil portion. Then, the back surface side near the opposing location of the 1st coil part can also be heated efficiently, and the distortion removal by the welding performed on the said back surface side can be performed efficiently.
　このとき、特に、第二のコイル部は、第一のコイル部から所定の距離だけ離れた当該第一のコイル部の周囲に、当該第一のコイル部自体を挟むよう当該第一のコイル部の両側方に位置して配置されている。これにより、第一のコイル部の周囲、特に、第一のコイル部を挟んで配置された第二のコイル部によって、第一のコイル部の対向箇所を中心として広範囲に、かつ、均等に、鋼板を過度に加熱することなく、より適切に加熱することができる。 At this time, in particular, the second coil part is arranged so that the first coil part itself is sandwiched around the first coil part that is separated from the first coil part by a predetermined distance. It is located on both sides of the. Thereby, around the first coil part, in particular, with the second coil part arranged across the first coil part, over a wide range and evenly around the opposite part of the first coil part, The steel sheet can be heated more appropriately without being heated excessively.
　また、上記歪み取り用加熱装置では、
　前記第二のコイル部は、前記鋼板の表面から前記第一のコイル部の前記鋼板の表面に対向する部位と当該鋼板の表面に対して最も離れた部位との中間点までの距離よりも、前記鋼板の表面から離れた位置に配置される、
という構成を取る。 Moreover, in the heating apparatus for strain relief,
The second coil part is more than the distance from the surface of the steel sheet to the middle point between the part of the first coil part facing the surface of the steel sheet and the part farthest from the surface of the steel sheet, Arranged at a position away from the surface of the steel sheet,
Take the configuration.
　これにより、鋼板の表面に対して第二のコイル部を適切な距離に配置することができ、第一のコイル部の対向箇所を中心として広範囲に、鋼板をより効率的に加熱することができる。 Thereby, a 2nd coil part can be arrange | positioned in the appropriate distance with respect to the surface of a steel plate, and a steel plate can be heated more efficiently in the wide area centering on the opposing location of a 1st coil part. .
　また、上記歪み取り用加熱装置では、
　前記第一のコイル部と前記第二のコイル部とは、それぞれ前記鋼板の表面に沿って延びる直線状に形成されると共に、相互にほぼ平行に配置される、
という構成を取る。 Moreover, in the heating apparatus for strain relief,
The first coil portion and the second coil portion are each formed in a linear shape extending along the surface of the steel plate, and are disposed substantially parallel to each other.
Take the configuration.
　これにより、直線状に位置する鋼板の溶接箇所に沿って直線状の第一のコイル部を配置して加熱することで、上述したように溶接箇所付近を効率よく加熱することができ、歪み取り作業を効率よく行うことができる。 Thus, by arranging and heating the linear first coil portion along the welded portion of the steel plate positioned in a straight line, the vicinity of the welded portion can be efficiently heated as described above, and distortion can be removed. Work can be performed efficiently.
　また、上記歪み取り用加熱装置では、
　隣り合って配置される前記第一のコイル部と前記第二のコイル部とに、それぞれに反対方向に電流が流れるよう形成されている、 Moreover, in the heating apparatus for strain relief,
The first coil portion and the second coil portion that are arranged adjacent to each other are formed such that current flows in opposite directions to each other.
　これにより、第一のコイル部と第二のコイル部とに生じた磁界が打ち消し合うことを抑制でき、鋼板を効率よく誘導加熱により加熱することができる。 Thereby, it is possible to suppress cancellation of the magnetic fields generated in the first coil portion and the second coil portion, and the steel plate can be efficiently heated by induction heating.
　また、上記歪み取り用加熱装置では、
　前記第一のコイル部と前記第二のコイル部とは、相互に接続された１つのコイルにて形成される、
という構成を取る。 Moreover, in the heating apparatus for strain relief,
The first coil part and the second coil part are formed by one coil connected to each other,
Take the configuration.
　また、上記歪み取り用加熱装置では、
　前記第一のコイル部と前記第二のコイル部とは、相互に接続された１つのコイルにて形成される共に、当該コイルは渦巻状に巻回されて形成されており、
　前記第一のコイル部が、渦巻状の前記コイルの内部側に位置し、前記第二のコイル部が、渦巻状の前記コイルの外周側に位置する、
という構成を取る。 Moreover, in the heating apparatus for strain relief,
The first coil portion and the second coil portion are formed by one coil connected to each other, and the coil is formed by being wound in a spiral shape,
The first coil part is located on the inner side of the spiral coil, and the second coil part is located on the outer peripheral side of the spiral coil.
Take the configuration.
　これにより、高周波電流を１つのコイルに供給するだけで上述した効率的な誘導加熱を実現できる加熱装置を提供できる。そして、簡易な構造で構成することができるため、低コスト化も図ることができる。 Thereby, it is possible to provide a heating device that can realize the above-described efficient induction heating only by supplying a high-frequency current to one coil. And since it can comprise with a simple structure, cost reduction can also be achieved.
　また、上記歪み取り用加熱装置では、
　前記鋼板の表面に対向して配置され、当該鋼板を冷却する冷却部をさらに備え、
　前記冷却部は、前記第一のコイル部の周囲に、少なくとも当該第一のコイル部を挟むよう当該第一のコイル部の両側方に位置して配置される、
という構成を取る。 Moreover, in the heating apparatus for strain relief,
It is arranged opposite to the surface of the steel plate, further comprising a cooling part for cooling the steel plate,
The cooling unit is disposed on both sides of the first coil unit so as to sandwich at least the first coil unit around the first coil unit.
Take the configuration.
　そして、上記歪み取り用加熱装置では、
　前記冷却部は、前記第二のコイル部から所定の距離だけ離れて、前記第一のコイル部側とは反対側の側方に位置し、前記第一のコイル部を挟むよう配置されている前記第二のコイル部をさらに挟むよう配置されている、
という構成を取る。 And in the heating device for strain relief,
The cooling part is located at a side away from the second coil part by a predetermined distance, on the side opposite to the first coil part side, and is arranged so as to sandwich the first coil part. Arranged to further sandwich the second coil part,
Take the configuration.
　さらに、上記歪み取り用加熱装置では、
　前記冷却部は、前記鋼板の表面に対して、少なくとも当該鋼板の表面に対する前記第一のコイル部の距離よりも離れて配置されており、前記鋼板の表面と対向する部位から当該鋼板の表面に向かって冷却物質を排出することにより当該鋼板を冷却するよう構成されている、
という構成を取る。 Furthermore, in the heating apparatus for strain relief,
The cooling part is disposed at least with respect to the surface of the steel sheet, at a distance greater than the distance of the first coil part with respect to the surface of the steel sheet, and from the portion facing the surface of the steel sheet to the surface of the steel sheet. It is configured to cool the steel sheet by discharging the cooling material toward the
Take the configuration.
　上記構成により、第一のコイル部にて局所的に加熱されている鋼板の周囲を冷却することができる。特に、冷却部を第二のコイル部を挟んで配置することにより、当該第二のコイル部の外側に位置する箇所の鋼板を冷却するため、鋼板を、第一のコイル部の対向箇所を中心として広範囲で加熱できると共に、外側が過度に加熱されることを抑制することができる。 With the above configuration, it is possible to cool the periphery of the steel plate that is locally heated in the first coil portion. In particular, by disposing the cooling part across the second coil part, in order to cool the steel sheet located at the outside of the second coil part, the steel sheet is centered on the opposite part of the first coil part. As described above, it can be heated in a wide range, and excessive heating of the outside can be suppressed.
　また、上記歪み取り用加熱装置では、
　前記第一のコイル部と前記第二のコイル部と前記冷却部とは、それぞれ前記鋼板の表面に沿って延びる直線状に形成されると共に、それぞれがほぼ平行に配置される、
という構成としてもよい。 Moreover, in the heating apparatus for strain relief,
The first coil part, the second coil part, and the cooling part are each formed in a straight line extending along the surface of the steel sheet, and are arranged substantially in parallel.
It is good also as a structure of.
　また、上記歪み取り用加熱装置では、
　前記第一のコイル部と前記第二のコイル部とは、相互に接続された１つのコイルにて形成される共に、当該コイルは渦巻状に巻回されて形成されており、
　前記第一のコイル部が、渦巻状の前記コイルの内部側に位置し、前記第二のコイル部が、渦巻状の前記コイルの外周側に位置し、
　前記冷却部が、前記第二のコイル部から所定の距離だけ離れて当該第二のコイル部のさらに外側に位置し、当該第二のコイル部を取り囲んで配置されている、
という構成としてもよい。 Moreover, in the heating apparatus for strain relief,
The first coil portion and the second coil portion are formed by one coil connected to each other, and the coil is formed by being wound in a spiral shape,
The first coil part is located on the inner side of the spiral coil, and the second coil part is located on the outer peripheral side of the spiral coil,
The cooling unit is located at a predetermined distance away from the second coil unit and further outside the second coil unit, and is disposed surrounding the second coil unit.
It is good also as a structure of.
　また、本発明の他の形態である加熱装置は、
　加熱対象となる板材の表面に対向して配置され、供給された高周波電流が流れることにより前記板材を誘導加熱する第一のコイル部と第二のコイル部とを備え、
　前記第一のコイル部は、前記板材の表面に接触あるいは近接して配置され、
　前記第二のコイル部は、前記板材の表面に対して、当該板材の表面に対する前記第一のコイル部の距離よりも離れて配置されると共に、前記第一のコイル部から所定の距離だけ離れた当該第一のコイル部の周囲に配置され、さらに、前記第一のコイル部を挟むよう当該第一のコイル部の両側方に位置して配置される、
という構成を取る。 Moreover, the heating apparatus which is the other form of this invention,
It is arranged opposite to the surface of the plate material to be heated, and includes a first coil portion and a second coil portion that inductively heat the plate material when the supplied high-frequency current flows,
The first coil portion is disposed in contact with or close to the surface of the plate material,
The second coil portion is disposed away from the surface of the plate material by a predetermined distance from the surface of the plate material, and further away from the first coil portion. Arranged around the first coil part, and further, located on both sides of the first coil part so as to sandwich the first coil part,
Take the configuration.
　そして、上記加熱装置では、
　前記板材の表面に対向して配置され、当該板材を冷却する冷却部を備え、
　前記冷却部は、前記第一のコイル部の周囲に、少なくとも当該第一のコイル部を挟むよう当該第一のコイル部の両側方に位置して配置される、
という構成を取る。 And in the heating device,
It is arranged facing the surface of the plate material, and includes a cooling unit that cools the plate material,
The cooling unit is disposed on both sides of the first coil unit so as to sandwich at least the first coil unit around the first coil unit.
Take the configuration.
　このように、本発明は、溶接により生じた鋼板の歪みを取る目的だけでなく、他の目的で板材を誘導加熱することにも利用可能であり、第一のコイル部の対向箇所を中心として広範囲に、かつ、均等に、鋼板を過度に加熱することなく、より適切に加熱することができる。 Thus, the present invention can be used not only for the purpose of taking distortion of a steel plate caused by welding, but also for induction heating of a plate material for other purposes, centering on the opposite part of the first coil part. The steel sheet can be heated more appropriately over a wide range and evenly without excessive heating.
　本発明は、以上のように構成されることにより、板材を効率よく誘導加熱することができる。 The present invention is configured as described above, whereby the plate material can be efficiently induction-heated.
本発明の歪み取り用加熱装置による加熱対象となる鋼板の一例を示す図である。It is a figure which shows an example of the steel plate used as the heating object by the heating apparatus for distortion removal of this invention. 本発明に関連する歪み取り用加熱装置の構成の一例を示す図である。It is a figure which shows an example of a structure of the heating apparatus for distortion removal relevant to this invention. 本発明である歪み取り用加熱装置の構成を示す図である。It is a figure which shows the structure of the heating apparatus for distortion removal which is this invention. 本発明である歪み取り用加熱装置の構成を示す図である。It is a figure which shows the structure of the heating apparatus for distortion removal which is this invention. 実施形態１における歪み取り用加熱装置の加熱コイルの構成を示す図である。It is a figure which shows the structure of the heating coil of the heating apparatus for distortion removal in Embodiment 1. FIG. 実施形態１における歪み取り用加熱装置の加熱コイルの構成及び加熱時の様子を示す図である。It is a figure which shows the structure at the time of the heating coil of the heating apparatus for distortion removal in Embodiment 1, and the mode at the time of a heating. 実施形態２における歪み取り用加熱装置の加熱コイルの構成を示す図である。It is a figure which shows the structure of the heating coil of the heating apparatus for distortion removal in Embodiment 2. FIG. 実施形態２における歪み取り用加熱装置の加熱コイルの構成及び加熱時の様子を示す図である。It is a figure which shows the structure at the time of the heating coil of the heating apparatus for distortion removal in Embodiment 2, and the mode at the time of a heating. 実施形態３における歪み取り用加熱装置の加熱コイルの構成を示す図である。It is a figure which shows the structure of the heating coil of the heating apparatus for distortion removal in Embodiment 3. 実施形態４における歪み取り用加熱装置の加熱コイルの構成を示す図である。It is a figure which shows the structure of the heating coil of the heating apparatus for distortion removal in Embodiment 4. 実施形態４における歪み取り用加熱装置の加熱コイルの構成及び加熱時の様子を示す図である。It is a figure which shows the structure at the time of a heating coil of the heating apparatus for distortion removal in Embodiment 4, and the mode at the time of a heating. 実施形態４における歪み取り用加熱装置の加熱コイルの構成及び加熱時の様子を示す図である。It is a figure which shows the structure at the time of a heating coil of the heating apparatus for distortion removal in Embodiment 4, and the mode at the time of a heating. 実施形態４における歪み取り用加熱装置の構成の変形例を示す図である。It is a figure which shows the modification of the structure of the heating apparatus for distortion removal in Embodiment 4. 実施形態５における歪み取り用加熱装置の加熱コイルの構成を示す図である。It is a figure which shows the structure of the heating coil of the heating apparatus for distortion removal in Embodiment 5.
　＜実施形態１＞
　本発明の第１の実施形態を、図３乃至図６を参照して説明する。図３乃至図４は、本発明である歪み取り用加熱装置の構成を示す図であり、図５乃至図６は、歪み取り用加熱装置を構成するコイルの構成及び加熱時の様子を示す図である。 <Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. 3 to 4 are diagrams showing a configuration of a strain relief heating apparatus according to the present invention, and FIGS. 5 to 6 are diagrams showing a configuration of a coil constituting the strain relief heating apparatus and a state during heating. It is.
　まず、歪み取り用加熱装置１の構成について、図３乃至図４を参照して説明する。図３は、歪み取り用加熱装置１の正面図を示し、図４は、その底面図を示す。なお、図３及び図４では、歪み取り用加熱装置１の構成を簡略化して図示する。 First, the configuration of the strain relief heating apparatus 1 will be described with reference to FIGS. FIG. 3 shows a front view of the strain relief heating apparatus 1, and FIG. 4 shows a bottom view thereof. 3 and 4, the configuration of the strain relief heating apparatus 1 is shown in a simplified manner.
　歪み取り用加熱装置１は、本体２に車輪３が装備されており、また、本体２から上方に延びる手押し部４が設けられている。これにより、作業者が手押し部４を押すことで、加熱対象となる鋼板Ｐ１の表面を走行可能なよう構成されている。なお、加熱対象となる鋼板Ｐ１は、図１を参照して説明したように、例えば、船舶の甲板を形成する所定の厚みを有する平板状の鋼板Ｐ１であり、裏面側で、当該鋼板Ｐ１を支持する他の鋼板Ｐ２の端部が垂直に当接して組み付けられ、当接箇所が溶接されたものである。そして、歪み取り用加熱装置１は、鋼板Ｐ１の裏面側の溶接箇所を当該鋼板Ｐ１の表面側から加熱することにより、溶接によって生じた鋼板Ｐ１の歪みを取り除くよう使用される。 The distortion removing heating device 1 is provided with a wheel 3 on a main body 2 and a hand pushing portion 4 extending upward from the main body 2. Thereby, it is comprised so that a worker can drive | work the surface of the steel plate P1 used as a heating object, when the hand pushing part 4 is pushed. In addition, as described with reference to FIG. 1, the steel plate P1 to be heated is, for example, a flat steel plate P1 having a predetermined thickness that forms the deck of a ship, and the steel plate P1 is formed on the back side. The other steel plate P2 to be supported is assembled in such a manner that the end portions of the steel plate P2 are in contact with each other vertically and welded. And the heating apparatus 1 for distortion removal is used so that the distortion of the steel plate P1 which arose by welding may be removed by heating the welding location of the back surface side of the steel plate P1 from the surface side of the said steel plate P1.
　なお、鋼板Ｐ１の溶接箇所は、裏面側で当接する他の鋼板Ｐ２の端部に沿って直線状に連続的あるいは断続的に位置する。そして、かかる直線状に位置する溶接箇所に沿って歪み取り用加熱装置１を走行させて、溶接によって生じた鋼板Ｐ１の歪みを取り除く作業を行う。なお、本実施形態では、歪み取り用加熱装置１が走行可能な構成としているが、必ずしも走行可能であることに限定されない。 In addition, the welding location of the steel plate P1 is located continuously or intermittently in a straight line along the end portion of the other steel plate P2 that abuts on the back surface side. And the heating apparatus 1 for distortion removal is run along the welding location located in this linear form, and the operation | work which removes distortion of the steel plate P1 produced by welding is performed. In the present embodiment, the strain relief heating apparatus 1 is configured to be able to travel, but is not necessarily limited to being capable of traveling.
　そして、歪み取り用加熱装置１は、鋼板１を加熱するための構造として、装置１自体の下面側に、鋼板１の表面に対向して配置される加熱コイル１０を備えている。特に、本実施形態における加熱コイル１０は、図４に示すように、走行方向に沿って長手方向が位置し、相互に平行に配置された３本の直線状のコイル部１１，１２ａ，１２ｂを有する形状に形成されている。以下、本実施形態における加熱コイル１０の具体的な構成について、図５及び図６を参照して説明する。なお、高周波電流を供給するために、電源や増幅トランスなども装備しているが、かかる構成の説明は省略する。 And the heating apparatus 1 for distortion removal is equipped with the heating coil 10 arrange | positioned facing the surface of the steel plate 1 on the lower surface side of the apparatus 1 itself as a structure for heating the steel plate 1 itself. In particular, as shown in FIG. 4, the heating coil 10 according to the present embodiment has three linear coil portions 11, 12a, and 12b that are arranged in parallel with each other in the longitudinal direction along the traveling direction. It is formed in the shape to have. Hereinafter, a specific configuration of the heating coil 10 in the present embodiment will be described with reference to FIGS. 5 and 6. In order to supply a high-frequency current, a power supply, an amplification transformer, and the like are also provided, but description of such a configuration is omitted.
　図５は、加熱コイル１０の構成を示す斜視図である。この図に示すように、加熱コイル１０は、一端側に位置し高周波電流が供給される２つの入力端１３，１４と、３本の直線状のコイル部１１，１２ａ，１２ｂと、を有して構成されている。これら３本の直線状のコイル部１１，１２ａ，１２ｂは、全て接続されて１つのコイルとして形成されており、入力端１３，１４から供給される高周波電流が流れるよう構成されている。なお、加熱コイル１０は、銅で形成され内部が空洞な管状の部材で構成されており、内部には冷却用の水が流れるよう構成されている（図６（Ａ）参照）。 FIG. 5 is a perspective view showing the configuration of the heating coil 10. As shown in this figure, the heating coil 10 has two input ends 13 and 14 which are located on one end side and to which a high-frequency current is supplied, and three linear coil portions 11, 12a and 12b. Configured. These three linear coil portions 11, 12a, 12b are all connected and formed as one coil, and are configured such that a high-frequency current supplied from the input ends 13, 14 flows. The heating coil 10 is formed of a tubular member made of copper and having a hollow inside, and is configured such that cooling water flows therein (see FIG. 6A).
　そして、３本のコイル部１１，１２ａ，１２ｂのうち、中央に位置する主加熱コイル部１１（第一のコイル部）は、一端側が符号１３に示す入力端に接続されており、他端側が他の２本のコイル部１２ａ，１２ｂに接続されている。そして、主加熱コイル部１１は、図６（Ａ）に示すように、鋼板Ｐ１の表面に近接するよう配置される。なお、歪み取り用加熱装置１の底面には所定の厚さの耐熱シートが装備されているため、主加熱コイル部１１は、耐熱シートの厚み分だけ鋼板Ｐ１の表面から離れて近接する位置に配置される。但し、主加熱コイル部１１は、鋼板１に接触する位置に配置されてもよい。 Of the three coil parts 11, 12a, 12b, the main heating coil part 11 (first coil part) located in the center has one end connected to the input end indicated by reference numeral 13, and the other end side It is connected to the other two coil portions 12a and 12b. And the main heating coil part 11 is arrange | positioned so that it may adjoin to the surface of the steel plate P1, as shown to FIG. 6 (A). In addition, since the heat-resistant sheet | seat of predetermined thickness is equipped in the bottom face of the heating apparatus 1 for distortion removal, the main heating coil part 11 is in the position which is separated from the surface of the steel plate P1 by the thickness of a heat-resistant sheet, and adjoins it. Be placed. However, the main heating coil unit 11 may be disposed at a position in contact with the steel plate 1.
　また、他の２本のコイル部１２ａ，１２ｂである補助加熱コイル部１２ａ，１２ｂ（第二のコイル部）は、主加熱コイル部１１と平行に、かつ、主加熱コイル部１１から所定の距離だけ離れた周囲に配置されている。具体的に、２本の補助加熱コイル部１２ａ，１２ｂは、主加熱コイル部１１を両側方から挟むよう配置されている。そして、２本の補助加熱コイル部１２ａ，１２ｂは、それぞれの一端側が他方の入力端１４に接続されており、それぞれの他端側が補助加熱コイル部１２ａ，１２ｂ同士及び主加熱コイル部１と接続されている。つまり、加熱コイル１０の他端側は、３本のコイル部１１，１２ａ，１２ｂが接続されて構成されている。 Further, the auxiliary heating coil portions 12a and 12b (second coil portions), which are the other two coil portions 12a and 12b, are parallel to the main heating coil portion 11 and at a predetermined distance from the main heating coil portion 11. Are only placed around the perimeter. Specifically, the two auxiliary heating coil portions 12a and 12b are arranged so as to sandwich the main heating coil portion 11 from both sides. The two auxiliary heating coil portions 12a and 12b have one end connected to the other input end 14 and the other end connected to the auxiliary heating coil portions 12a and 12b and the main heating coil portion 1. Has been. That is, the other end side of the heating coil 10 is configured by connecting three coil portions 11, 12a, 12b.
　さらに、２本の補助加熱コイル部１２ａ，１２ｂは、図６（Ａ）に示すように、鋼板Ｐ１の表面に対して上記主加熱コイル部１１よりも離れて配置されている。つまり、鋼板Ｐ１の表面から当該表面に対向する補助加熱コイル部１２ａ，１２ｂの対向面までの距離が、鋼板Ｐ１の表面から当該表面に対向する主加熱コイル部１１の対向面までの距離よりも長くなるよう、補助加熱コイル部１２ａ，１２ｂは配置されている。 Furthermore, as shown in FIG. 6 (A), the two auxiliary heating coil portions 12a and 12b are disposed away from the main heating coil portion 11 with respect to the surface of the steel plate P1. That is, the distance from the surface of the steel plate P1 to the opposing surfaces of the auxiliary heating coil portions 12a and 12b facing the surface is larger than the distance from the surface of the steel plate P1 to the opposing surface of the main heating coil portion 11 facing the surface. The auxiliary heating coil portions 12a and 12b are arranged so as to be longer.
　具体的に、本実施形態における補助加熱コイル部１２ａ，１２ｂは、鋼板Ｐ１の表面に対して、主加熱コイル部１１の上端よりも上方に位置するよう配置されている。換言すると、鋼板Ｐ１の表面から当該表面に対向する補助加熱コイル部１２ａ，１２ｂの対向面までの距離が、鋼板Ｐ１の表面から当該表面に対して最も離れた主加熱コイル部１１の上端（鋼板Ｐ１の表面に対する対向面とは反対側の面）までの距離よりも長くなるよう、補助加熱コイル部１２ａ，１２ｂは配置されている。 Specifically, the auxiliary heating coil portions 12a and 12b in the present embodiment are arranged so as to be positioned above the upper end of the main heating coil portion 11 with respect to the surface of the steel plate P1. In other words, the distance from the surface of the steel plate P1 to the opposing surfaces of the auxiliary heating coil portions 12a and 12b facing the surface is the upper end (the steel plate) of the main heating coil portion 11 farthest from the surface of the steel plate P1 with respect to the surface. The auxiliary heating coil portions 12a and 12b are arranged so as to be longer than the distance to the surface on the opposite side to the surface facing P1.
　但し、補助加熱コイル部１２ａ，１２ｂは、図６（Ａ）に示すように鋼板Ｐ１の表面に対して主加熱コイル部１１の上端よりも上方に位置することに限定されず、少なくとも主加熱コイル部１１よりも鋼板Ｐ１の表面から離れて位置していればよい。例えば、鋼板Ｐ１の表面から補助加熱コイル部１２ａ，１２ｂまでの距離Ｄ１（図６（Ａ）参照）を、少なくとも、鋼板Ｐ１の表面から、主加熱コイル部１１の鋼板Ｐ１の表面に対向する部位と当該鋼板Ｐ１の表面に対して最も離れた部位（上端）との中間点までの距離Ｄ２（図６（Ａ）参照）よりも長く設定するとよい。このようにすることで、後述するように鋼板Ｐ１の主加熱コイル部１１の対向箇所を中心として広範囲で、より効率的に加熱することができる。 However, the auxiliary heating coil portions 12a and 12b are not limited to being positioned above the upper end of the main heating coil portion 11 with respect to the surface of the steel plate P1 as shown in FIG. What is necessary is just to be located away from the surface of the steel plate P1 rather than the part 11. FIG. For example, a distance D1 (see FIG. 6A) from the surface of the steel plate P1 to the auxiliary heating coil portions 12a and 12b is at least a portion facing the surface of the steel plate P1 of the main heating coil portion 11 from the surface of the steel plate P1. And a distance D2 (see FIG. 6A) to an intermediate point between the most distant portion (upper end) with respect to the surface of the steel plate P1 may be set. By doing in this way, it can heat more efficiently in the wide range centering on the opposing location of the main heating coil part 11 of the steel plate P1 so that it may mention later.
　なお、図６（Ａ）の符号１５に示すように、３本のコイル部１１，１２ａ，１２ｂは、コア部材１５に周囲を囲まれた状態で、歪み取り用加熱装置１に搭載されている。このコア部材１５は、コイル部１１，１２ａ，１２ｂに高周波電流を流すことによって生じる磁束を加熱部分に集中させるためのものである。 In addition, as shown to the code | symbol 15 of FIG. 6 (A), the three coil parts 11, 12a, and 12b are mounted in the heating apparatus 1 for distortion removal in the state enclosed by the core member 15. . The core member 15 is for concentrating the magnetic flux generated by flowing a high-frequency current through the coil portions 11, 12a, 12b in the heating portion.
　そして、以上のように構成される加熱コイル１０に高周波電流が供給されると、図５の矢印に示すように入力端１３，１４に電流が流れる状態においては、３本のコイル部１１，１２ａ，１２ｂに対してそれぞれ図５の矢印の方向に電流が流れる。このとき、隣り合って配置される主加熱コイル部１１と補助加熱コイル部１２ａ、あるいは、主加熱コイル部１１と補助加熱コイル部１２ｂ、に着目すると、それぞれに反対方向に電流が流れることとなる。 When a high-frequency current is supplied to the heating coil 10 configured as described above, the three coil portions 11 and 12a are in a state where current flows through the input ends 13 and 14 as shown by arrows in FIG. , 12b, current flows in the direction of the arrow in FIG. At this time, when attention is paid to the main heating coil part 11 and the auxiliary heating coil part 12a arranged adjacent to each other, or the main heating coil part 11 and the auxiliary heating coil part 12b, currents flow in opposite directions to each other. .
　上記のように加熱コイル１０に高周波電流を供給することで、当該電流によって生じた磁界により、図６（Ｂ）に示すように、鋼板Ｐ１を表面側から誘導加熱により加熱することができる。このとき、符号Ａ１に示すように、主加熱コイル部１１は鋼板Ｐ１の表面に接触あるいは近接して配置されているため、当該鋼板Ｐ１に対する対向箇所を局所的に共強度で加熱することができる。これに加え、補助加熱コイル部１２ａ，１２ｂは、主加熱コイル部１１よりも鋼板Ｐ１の表面から離れて配置されているため、当該主加熱コイル部１１にて局所的に加熱される鋼板Ｐ１の対向箇所の周囲を、符号Ａ２に示すように、加熱強度は弱いものの広範囲に誘導加熱することができる。このため、鋼板Ｐ１を、主加熱コイル部１１の対向箇所を中心として広範囲で、外側から中心に向かって徐々に加熱強度が強くなるよう加熱することができる。 By supplying a high-frequency current to the heating coil 10 as described above, the steel plate P1 can be heated by induction heating from the surface side, as shown in FIG. 6B, by the magnetic field generated by the current. At this time, as indicated by reference numeral A1, the main heating coil portion 11 is disposed in contact with or close to the surface of the steel plate P1, and therefore, the portion facing the steel plate P1 can be locally heated with the same strength. . In addition to this, since the auxiliary heating coil portions 12a and 12b are arranged farther from the surface of the steel plate P1 than the main heating coil portion 11, the auxiliary heating coil portions 12a and 12b of the steel plate P1 locally heated by the main heating coil portion 11 are arranged. As shown by reference numeral A2, the surroundings of the facing portion can be induction-heated over a wide range although the heating intensity is weak. For this reason, it is possible to heat the steel sheet P1 in a wide range centering on the portion facing the main heating coil section 11 so that the heating intensity gradually increases from the outside toward the center.
　その結果、鋼板Ｐ１の主加熱コイル部１１の対向箇所の周囲において、過度の加熱を抑制しつつ、当該対向箇所付近を効率的に加熱することができる。すると、主加熱コイル部１１の対向箇所付近の裏面側も効率よく加熱することができ、当該裏面側で行われた溶接（符号Ｗ１，Ｗ２）による歪みの除去を効率よく行うことができる。 As a result, the vicinity of the facing portion can be efficiently heated while suppressing excessive heating around the facing portion of the main heating coil portion 11 of the steel plate P1. Then, the back surface side near the opposite location of the main heating coil part 11 can also be efficiently heated, and the distortion can be efficiently removed by welding (reference characters W1, W2) performed on the back surface side.
　なお、主加熱コイル１１と補助加熱コイル１２ａ，１２ｂとに流れる電流が逆方向となるため、当該主加熱コイル１１と補助加熱コイル１２ａ，１２ｂとの周りに生じる磁界が打ち消し合うことを抑制できる。従って、より鋼板Ｐ１を効率よく誘導加熱することができる。 In addition, since the electric current which flows into the main heating coil 11 and the auxiliary heating coils 12a and 12b becomes a reverse direction, it can suppress that the magnetic field produced around the said main heating coil 11 and the auxiliary heating coils 12a and 12b cancels each other. Therefore, the steel plate P1 can be induction-heated more efficiently.
　＜実施形態２＞
　次に、本発明の第２の実施形態を、図７乃至図８を参照して説明する。図７乃至図８は、本実施形態における歪み取り用加熱装置を構成する加熱コイルの構成及び加熱時の様子を示す図である。 <Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 7 to FIG. 8 are diagrams showing the configuration of the heating coil that constitutes the strain-relieving heating apparatus according to this embodiment and the state during heating.
　本実施形態における歪み取り用加熱装置１は、上述した実施形態１の構成とほぼ同様であるが、鋼板１を加熱するために装置１自体の下面側に設けられる加熱コイル２０の構成が異なる。特に、本実施形態における加熱コイル２０は、走行方向に沿って延び、相互に平行に配置された４本の直線状のコイル部２１ａ，２１ｂ，２２ａ，２２ｂを有する形状に形成されている。以下、本実施形態における加熱コイル２０の具体的な構成について、図７及び図８を参照して説明する。 The strain relief heating device 1 in the present embodiment is substantially the same as the configuration of the first embodiment described above, but the configuration of the heating coil 20 provided on the lower surface side of the device 1 itself for heating the steel plate 1 is different. In particular, the heating coil 20 in the present embodiment is formed in a shape having four linear coil portions 21a, 21b, 22a, and 22b that extend along the traveling direction and are arranged in parallel to each other. Hereinafter, a specific configuration of the heating coil 20 in the present embodiment will be described with reference to FIGS. 7 and 8.
　図７は、加熱コイル２０の構成を示す斜視図である。この図に示すように、加熱コイル２０は、一端側に位置し高周波電流が入力される２つの入力端２３，２４と、４本の直線状のコイル部２１ａ，２１ｂ，２２ａ，２２ｂと、を有して構成されている。これら４本の直線状のコイル部２１ａ，２１ｂ，２２ａ，２２ｂは、全て接続されて１つのコイルとして形成されており、入力端２３，２４から供給される高周波電流が流れるよう構成されている。なお、加熱コイル２０は、銅で形成され、内部が空洞の管状の部材で構成されており、内部には冷却用の水が流れるよう構成されている（図８（Ａ）参照）。 FIG. 7 is a perspective view showing the configuration of the heating coil 20. As shown in this figure, the heating coil 20 includes two input ends 23 and 24, which are located on one end side and to which a high-frequency current is input, and four linear coil portions 21a, 21b, 22a and 22b. It is configured. These four linear coil portions 21a, 21b, 22a, and 22b are all connected and formed as one coil, and are configured such that a high-frequency current supplied from the input ends 23 and 24 flows. The heating coil 20 is made of copper, and is formed of a hollow tubular member. The cooling water flows inside the heating coil 20 (see FIG. 8A).
　そして、４本のコイル部２１ａ，２１ｂ，２２ａ，２２ｂは、内側に位置する２本の主加熱コイル部２１ａ，２１ｂ（第一のコイル部）と、それらの両外側にそれぞれ位置する２本の補助加熱コイル部２２ａ，２２ｂ（第二のコイル部）と、により構成されている。そして、２本の主加熱コイル部２１ａ，２１ｂは、図８（Ａ）に示すように、鋼板Ｐ１の表面に近接（あるいは接触）するよう配置される。また、他の２本の補助加熱コイル部２２ａ，２２ｂは、主加熱コイル部２１ａ，２１ｂと平行に、かつ、主加熱コイル部２１ａ，２１ｂから所定の距離だけ離れた周囲に配置されている。具体的に、２本の補助加熱コイル部２２ａ，２２ｂは、２本の主加熱コイル部２１ａ，２２ａを両側方から挟むよう配置されている。 And four coil parts 21a, 21b, 22a, and 22b are two main heating coil parts 21a and 21b (1st coil part) located inside, and two each located in those both outer sides, respectively. And auxiliary heating coil portions 22a and 22b (second coil portions). And the two main heating coil parts 21a and 21b are arrange | positioned so that it may adjoin to the surface of the steel plate P1, as shown to FIG. 8 (A). The other two auxiliary heating coil portions 22a and 22b are arranged in parallel to the main heating coil portions 21a and 21b and around a predetermined distance from the main heating coil portions 21a and 21b. Specifically, the two auxiliary heating coil portions 22a and 22b are arranged so as to sandwich the two main heating coil portions 21a and 22a from both sides.
　さらに、２本の補助加熱コイル部２２ａ，２２ｂは、図８（Ａ）に示すように、鋼板Ｐ１の表面に対して上記主加熱コイル部２１ａ，２１ｂよりも離れて配置されている。つまり、鋼板Ｐ１の表面から当該表面に対向する補助加熱コイル部２２ａ，２２ｂの対向面までの距離が、鋼板Ｐ１の表面から当該表面に対向する主加熱コイル部２１ａ，２１ｂの対向面までの距離よりも長くなるよう、補助加熱コイル部２２ａ，２２ｂは配置されている。 Furthermore, as shown in FIG. 8 (A), the two auxiliary heating coil portions 22a and 22b are disposed away from the main heating coil portions 21a and 21b with respect to the surface of the steel plate P1. That is, the distance from the surface of the steel plate P1 to the opposing surface of the auxiliary heating coil portions 22a and 22b facing the surface is the distance from the surface of the steel plate P1 to the opposing surface of the main heating coil portions 21a and 21b facing the surface. The auxiliary heating coil portions 22a and 22b are arranged so as to be longer.
　なお、図８（Ｂ）の符号２５に示すように、４本のコイル部２１ａ，２１ｂ，２２ａ，２２ｂは、コア部材に周囲を囲まれた状態で、歪み取り用加熱装置１に搭載されている。 In addition, as shown to the code | symbol 25 of FIG. 8 (B), the four coil parts 21a, 21b, 22a, and 22b are mounted in the distortion removal heating apparatus 1 in the state surrounded by the core member. Yes.
　そして、以上のように構成される加熱コイル２０に高周波電流が供給されると、図７の矢印に示すように入力端２３，２４に電流が流れる状態においては、４本のコイル部２１ａ，２１ｂ，２２ａ，２２ｂに対してそれぞれ図７の矢印の方向に電流が流れる。このとき、隣り合って配置される主加熱コイル部２１ａと補助加熱コイル部２２ａ、あるいは、主加熱コイル部２１ｂと補助加熱コイル部２２ｂ、に着目すると、それぞれに反対方向に電流が流れることとなる。 When a high-frequency current is supplied to the heating coil 20 configured as described above, the four coil portions 21a and 21b are in a state where current flows through the input ends 23 and 24 as indicated by arrows in FIG. , 22a and 22b, currents flow in the directions of the arrows in FIG. At this time, when attention is paid to the main heating coil portion 21a and the auxiliary heating coil portion 22a arranged adjacent to each other, or the main heating coil portion 21b and the auxiliary heating coil portion 22b, currents flow in opposite directions to each other. .
　上記のように加熱コイル２０に高周波電流を供給することで、当該電流によって生じた磁界により、図８（Ｂ）に示すように、鋼板Ｐ１を表面側から誘導加熱により加熱することができる。このとき、符号Ａ１に示すように、主加熱コイル部２１ａ，２１ｂは鋼板Ｐ１の表面に接触あるいは近接して配置されているため、当該鋼板Ｐ１に対する対向箇所を局所的に加熱することができる。これに加え、補助加熱コイル部２２ａ，２２ｂは、主加熱コイル部２１ａ，２１ｂよりも鋼板Ｐ１の表面から離れて配置されているため、当該主加熱コイル部２１ａ，２１ｂにて局所的に加熱される鋼板Ｐ１の対向箇所の周囲を、符号Ａ２に示すように、加熱強度は弱いものの広範囲に誘導加熱することができる。このため、鋼板Ｐ１を、主加熱コイル部２１ａ，２１ｂの対向箇所を中心として広範囲で、外側から中心に向かって徐々に加熱強度が強くなるよう加熱することができる。 By supplying the high-frequency current to the heating coil 20 as described above, the steel plate P1 can be heated by induction heating from the surface side as shown in FIG. 8B by the magnetic field generated by the current. At this time, as indicated by reference numeral A1, the main heating coil portions 21a and 21b are disposed in contact with or close to the surface of the steel plate P1, and therefore, the portion facing the steel plate P1 can be locally heated. In addition, since the auxiliary heating coil portions 22a and 22b are arranged farther from the surface of the steel plate P1 than the main heating coil portions 21a and 21b, they are locally heated by the main heating coil portions 21a and 21b. As shown by reference numeral A2, the periphery of the facing portion of the steel plate P1 can be induction-heated over a wide range although the heating strength is weak. For this reason, it is possible to heat the steel plate P1 in a wide range centering on the opposed portions of the main heating coil portions 21a and 21b so that the heating intensity gradually increases from the outside toward the center.
　その結果、鋼板Ｐ１の主加熱コイル部２１ａ，２１ｂの対向箇所の周囲において、過度の加熱を抑制しつつ、当該対向箇所付近を効率的に加熱することができる。すると、主加熱コイル部１１の対向箇所付近の裏面側も効率よく加熱することができ、当該裏面側で行われた溶接（符号Ｗ１，Ｗ２）による歪みの除去を効率よく行うことができる。 As a result, it is possible to efficiently heat the vicinity of the facing portion while suppressing excessive heating around the facing portion of the main heating coil portions 21a and 21b of the steel plate P1. Then, the back surface side near the opposite location of the main heating coil part 11 can also be efficiently heated, and the distortion can be efficiently removed by welding (reference characters W1, W2) performed on the back surface side.
　＜実施形態３＞
　次に、本発明の第３の実施形態を、図９を参照して説明する。図９は、本実施形態における歪み取り用加熱装置を構成する加熱コイルの構成を示す図であり、図９（Ａ）は平面図を示し、図９（Ｂ）は中央付近における断面図である。 <Embodiment 3>
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 9 is a diagram showing a configuration of a heating coil that constitutes the strain relief heating device in the present embodiment, FIG. 9A is a plan view, and FIG. 9B is a cross-sectional view in the vicinity of the center. .
　本実施形態における歪み取り用加熱装置１は、上述した実施形態１の構成とほぼ同様であるが、鋼板１を加熱するために装置１自体の下面側に設けられる加熱コイル３０の構成が異なる。特に、本実施形態における加熱コイル３０は、銅で形成された管状の部材で構成されている点では同様であるが、図９（Ａ）に示すように、１本のコイル部材が渦巻状に巻回されて形成されている。 The strain relief heating device 1 in the present embodiment is substantially the same as the configuration of the first embodiment described above, but the configuration of the heating coil 30 provided on the lower surface side of the device 1 itself for heating the steel plate 1 is different. In particular, the heating coil 30 in the present embodiment is the same in that it is composed of a tubular member formed of copper, but as shown in FIG. 9A, one coil member is spirally formed. It is formed by winding.
　さらに、渦巻状の加熱コイル３０の中心付近（内部側）に位置する主加熱コイル部３１は、図９（Ｂ）に示すように、加熱対象となる鋼板Ｐ１の表面に近接（あるいは接触）するよう配置される。また、加熱コイル３０の外周付近（外周側）つまり上記主加熱コイル部３１の周囲に位置する補助加熱コイル部３２は、図９（Ｂ）に示すように、鋼板Ｐ１の表面に対して上記主加熱コイル部３１よりも離れて配置されている。 Furthermore, as shown in FIG. 9B, the main heating coil portion 31 located near the center (inside) of the spiral heating coil 30 approaches (or contacts) the surface of the steel plate P1 to be heated. Arranged so that. Further, as shown in FIG. 9B, the auxiliary heating coil part 32 located near the outer periphery of the heating coil 30 (outer peripheral side), that is, around the main heating coil part 31, is arranged on the surface of the steel plate P1. The heating coil unit 31 is arranged away from the heating coil unit 31.
　本実施形態における加熱コイル３０は、以上のように構成されることにより、上述した他の実施形態同様に、鋼板Ｐ１を、主加熱コイル部３１の対向箇所を中心として広範囲で、外側から中心に向かって徐々に加熱強度が強くなるよう加熱することができる。その結果、鋼板Ｐ１の主加熱コイル部３１の対向箇所の周囲において、過度の加熱を抑制しつつ、当該対向箇所付近を効率的に加熱することができる。 By configuring the heating coil 30 in the present embodiment as described above, the steel plate P1 is spread over a wide range centering on the opposite location of the main heating coil portion 31 as in the other embodiments described above, and from the outside to the center. Heating can be performed so that the heating intensity gradually increases. As a result, the vicinity of the facing portion can be efficiently heated while suppressing excessive heating around the facing portion of the main heating coil portion 31 of the steel plate P1.
　＜実施形態４＞
　次に、本発明の第４の実施形態を、図１０乃至図１２を参照して説明する。図１０乃至図１２は、本実施形態における歪み取り用加熱装置を構成する加熱コイルの構成及び加熱時の様子を示す図である。 <Embodiment 4>
Next, a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 10 to FIG. 12 are diagrams showing the configuration of the heating coil that constitutes the strain relief heating apparatus in this embodiment and the state during heating.
　本実施形態における歪み取り用加熱装置１は、上述した実施形態１の構成に加えて、さらに２本の冷却部２６ａ，２６ｂを備えている。図１０に示すように、冷却部２６ａ，２６ｂは、直線形状に形成されており、上述したように走行方向に沿って延びる４本の直線状のコイル部２１ａ，２１ｂ，２２ａ，２２ｂと平行に配置されている。 In addition to the configuration of the first embodiment described above, the strain relief heating device 1 in the present embodiment further includes two cooling units 26a and 26b. As shown in FIG. 10, the cooling portions 26a and 26b are formed in a linear shape, and are parallel to the four linear coil portions 21a, 21b, 22a and 22b extending along the traveling direction as described above. Has been placed.
　具体的に、２本の冷却部２６ａ，２６ｂは、２本の補助加熱コイル部２２ａ，２２ｂからそれぞれ所定の距離だけ離れた周囲に、主加熱コイル部２１ａ，２１ｂの配置側とは反対側に配置されている。そして、２本の冷却部２６ａ，２６ｂは、２本の補助加熱コイル部２２ａ，２２ｂを両側方から挟むよう配置されている。 Specifically, the two cooling units 26a and 26b are arranged around a predetermined distance from the two auxiliary heating coil units 22a and 22b, on the side opposite to the arrangement side of the main heating coil units 21a and 21b. Has been placed. The two cooling parts 26a and 26b are arranged so as to sandwich the two auxiliary heating coil parts 22a and 22b from both sides.
　さらに、２本の冷却部２６ａ，２６ｂは、図１１（Ａ）に示すように、鋼板Ｐ１の表面に対して上記主加熱コイル部２１ａ，２１ｂよりも離れており、また、鋼板Ｐ１の表面に対する補助加熱コイル部２２ａ，２２ｂとほぼ同じ距離だけ離れて配置されている。但し、鋼板Ｐ１の表面に対する冷却部２６ａ，２６ｂの距離は、いかなる距離であってもよい。 Further, as shown in FIG. 11 (A), the two cooling parts 26a and 26b are separated from the main heating coil parts 21a and 21b with respect to the surface of the steel plate P1, and are also provided with respect to the surface of the steel plate P1. The auxiliary heating coil portions 22a and 22b are arranged at substantially the same distance. However, the distance of the cooling parts 26a and 26b with respect to the surface of the steel plate P1 may be any distance.
　また、冷却部２６ａ，２６ｂは、例えば銅で形成され、図１１（Ａ）に示すように、内部が空洞の管状の部材で構成されている。そして、冷却部２６ａ，２６ｂの内部には、鋼板Ｐ１を冷却するための水が流れるよう構成されている。かかる水は、各冷却部２６ａ，２６ｂに連結された支持管２７ａ，２７ｂを通じて供給される。 Further, the cooling units 26a and 26b are made of, for example, copper, and as shown in FIG. And it is comprised so that the water for cooling the steel plate P1 may flow inside the cooling units 26a and 26b. Such water is supplied through support pipes 27a and 27b connected to the cooling units 26a and 26b.
　さらに、図１１（Ａ）に示すように、各冷却部２６ａ，２６ｂには、鋼板Ｐ１の表面との対向面となる箇所に、内部から外部に通ずる貫通孔２６ａａ，２６ｂａが形成されている。かかる貫通孔２６ａａ，２６ｂａからは、後述するよう図１２（Ａ）の符号２８ａ，２８ｂに示すように、冷却部２６ａ，２６ｂの内部を流れる水が鋼板Ｐ１の表面に向かって排出される。なお、冷却部２６ａ，２６ｂから排出される物質（冷却物質）は水であることに限定されず、圧縮空気や水蒸気などの冷却可能な物質であればよい。これに応じて、支持管２７ａ，２７ｂから冷却部２６ａ，２６ｂに冷却物質が供給される。また、冷却管２６ａ，２６ｂを上述した各コイル部２１ａ，２１ｂ，２２ａ，２２ｂと連結し、当該コイル部内を流れる水を冷却部２６ａ，２６ｂに供給してもよい。 Furthermore, as shown in FIG. 11 (A), through holes 26aa and 26ba communicating from the inside to the outside are formed in the respective cooling portions 26a and 26b at locations facing the surface of the steel plate P1. From these through holes 26aa and 26ba, water flowing inside the cooling portions 26a and 26b is discharged toward the surface of the steel plate P1, as indicated by reference numerals 28a and 28b in FIG. In addition, the substance (cooling substance) discharged | emitted from cooling part 26a, 26b is not limited to water, What is necessary is just a coolable substance, such as compressed air and water vapor | steam. Accordingly, the cooling substance is supplied from the support tubes 27a and 27b to the cooling units 26a and 26b. Alternatively, the cooling pipes 26a and 26b may be connected to the coil portions 21a, 21b, 22a, and 22b described above, and water flowing in the coil portions may be supplied to the cooling portions 26a and 26b.
　上述した構成において、加熱コイル２０に高周波電流を供給するときの動作を、図１１乃至図１２を参照して説明する。まず、加熱コイル２０に高周波電流を供給することで、当該電流によって生じた磁界により、図１１（Ａ）に示すように、鋼板Ｐ１を表面側から誘導加熱により加熱することができる。このとき、符号Ａ１に示すように、主加熱コイル部２１ａ，２１ｂは鋼板Ｐ１の表面に接触あるいは近接して配置されているため、当該鋼板Ｐ１に対する対向箇所を局所的に加熱することができる。これに加え、補助加熱コイル部２２ａ，２２ｂは、主加熱コイル部２１ａ，２１ｂよりも鋼板Ｐ１の表面から離れて配置されているため、当該主加熱コイル部２１ａ，２１ｂにて局所的に加熱される鋼板Ｐ１の対向箇所の周囲を、符号Ａ２に示すように、加熱強度は弱いものの広範囲に誘導加熱することができる。 In the configuration described above, the operation when supplying a high-frequency current to the heating coil 20 will be described with reference to FIGS. First, by supplying a high-frequency current to the heating coil 20, the steel sheet P1 can be heated from the surface side by induction heating with a magnetic field generated by the current, as shown in FIG. At this time, as indicated by reference numeral A1, the main heating coil portions 21a and 21b are disposed in contact with or close to the surface of the steel plate P1, and therefore, the portion facing the steel plate P1 can be locally heated. In addition, since the auxiliary heating coil portions 22a and 22b are arranged farther from the surface of the steel plate P1 than the main heating coil portions 21a and 21b, they are locally heated by the main heating coil portions 21a and 21b. As shown by reference numeral A2, the periphery of the facing portion of the steel plate P1 can be induction-heated over a wide range although the heating strength is weak.
　ここで、上述した加熱コイル２０による鋼板Ｐ１の加熱箇所Ａ３は、図１１（Ｂ）の斜線で示すように広範囲となるが、かかる範囲に熱膨張が生じる。すると、主加熱コイル部２１ａ，２１ｂの対向箇所付近の裏面側のみならず、その周囲、例えば、補助加熱コイル部２２ａ，２２ｂや冷却部２６ａ，２６ｂとの対向箇所も加熱による熱膨張が生じ、鋼板Ｐ１が後に冷却されると不要な変形が生じうる。 Here, the heating point A3 of the steel plate P1 by the heating coil 20 described above is in a wide range as indicated by the oblique lines in FIG. 11B, but thermal expansion occurs in such a range. Then, not only the back surface side near the opposing location of the main heating coil portions 21a and 21b, but also the surroundings, for example, the opposing location with the auxiliary heating coil portions 22a and 22b and the cooling portions 26a and 26b, thermal expansion occurs due to heating, If the steel plate P1 is cooled later, unnecessary deformation may occur.
　そこで、本実施形態では、加熱コイル２０による加熱時に、図１２（Ａ）に示すように、冷却部２６ａ，２６ｂから水（冷却物質）２８ａ，２８ｂを鋼板Ｐ１に対して排出する。すると、冷却部２６ａ，２６ｂの貫通孔２６ａａ，２６ｂａに対向する鋼板Ｐ１部分は、排出された水によって冷却される。このため、図１２（Ｂ）の斜線で示すように、加熱コイル２０による鋼板Ｐ１の加熱箇所Ａ４は、主加熱コイル部２１ａ，２１ｂの対向箇所付近の裏面側とその周囲のわずかな範囲のみとなり、点線で示す冷却しない場合における加熱箇所Ａ３よりも狭い範囲となる。 Therefore, in the present embodiment, during heating by the heating coil 20, as shown in FIG. 12A, water (cooling substances) 28a and 28b are discharged from the cooling parts 26a and 26b to the steel plate P1. Then, the steel plate P1 portion facing the through holes 26aa and 26ba of the cooling portions 26a and 26b is cooled by the discharged water. For this reason, as shown by the oblique lines in FIG. 12 (B), the heating spot A4 of the steel plate P1 by the heating coil 20 is only the back surface side near the opposing part of the main heating coil portions 21a and 21b and a slight range around it. The range is narrower than the heating location A3 when the cooling is not performed as indicated by the dotted line.
　このようにすることで、上述同様に、鋼板Ｐ１を、主加熱コイル部２１ａ，２１ｂの対向箇所を中心として広範囲で、外側から中心に向かって徐々に加熱強度が強くなるよう加熱することができると共に、さらに外側の過度の加熱を抑制することができる。その結果、鋼板Ｐ１の裏面側で行われた溶接（符号Ｗ１，Ｗ２）による歪みの除去を効率よく行うことができると共に、鋼板Ｐ１に対する過度の加熱を抑制し不要な変形を防ぐことができる。 By doing in this way, similarly to the above, the steel plate P1 can be heated so that the heating intensity gradually increases from the outside toward the center over a wide range centering on the opposed portions of the main heating coil portions 21a and 21b. At the same time, excessive heating outside can be suppressed. As a result, distortion can be efficiently removed by welding (reference characters W1, W2) performed on the back side of the steel plate P1, and excessive heating of the steel plate P1 can be suppressed and unnecessary deformation can be prevented.
　また、上述した冷却部２６ａ，２６ｂの機能を、上記補助加熱コイル部２２ａ，２２ｂに搭載して構成してもよい。つまり、図１３（Ａ）に示すように、補助加熱コイル部２２ａ，２２ｂの鋼板Ｐ１との対向面に貫通孔２２ａａ，２２ｂａを形成し、補助加熱コイル２２ａ，２２ｂの内部に流れる水を、図１３（Ｂ）の符号２８ａ，２８ｂに示すように鋼板Ｐ１に対して冷却物質として排出してもよい。このように、冷却部としても機能する補助加熱コイル部２２ａ，２２ｂを、少なくとも主加熱コイル部２１ａ，２１ｂを挟むよう配置することで、上述同様に主加熱コイル部２１ａ，２１ｂの対向箇所を中心として広範囲で、外側から中心に向かって徐々に加熱強度が強くなるよう補助加熱コイル部２２ａ，２２ｂにて加熱することができると共に、さらに冷却機能にて外側の過度の加熱を抑制することができる。 Further, the functions of the cooling units 26a and 26b described above may be mounted on the auxiliary heating coil units 22a and 22b. That is, as shown in FIG. 13A, through holes 22aa and 22ba are formed on the surfaces of the auxiliary heating coil portions 22a and 22b facing the steel plate P1, and water flowing inside the auxiliary heating coils 22a and 22b is shown in FIG. You may discharge | emit as a cooling material with respect to the steel plate P1, as shown to the code | symbols 28a and 28b of 13 (B). As described above, the auxiliary heating coil portions 22a and 22b that also function as a cooling portion are disposed so as to sandwich at least the main heating coil portions 21a and 21b, so that the opposite portions of the main heating coil portions 21a and 21b are centered as described above. As a wide range, the auxiliary heating coil portions 22a and 22b can be heated so that the heating intensity gradually increases from the outside toward the center, and further, excessive heating outside can be suppressed by the cooling function. .
　＜実施形態５＞
　次に、本発明の第５の実施形態を、図１４を参照して説明する。図１４は、本実施形態における歪み取り用加熱装置を構成する加熱コイルの構成を示す図であり、図１４（Ａ）は平面図を示し、図１４（Ｂ）は中央付近における断面図である。 <Embodiment 5>
Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 14 is a diagram showing the configuration of the heating coil that constitutes the strain relief heating device in the present embodiment, FIG. 14A is a plan view, and FIG. 14B is a cross-sectional view in the vicinity of the center. .
　本実施形態における歪み取り用加熱装置１は、上述した実施形態３の構成に加えて、さらに最外周に、実施形態４で説明したものと同様の機能を有する冷却部３３を備えている。具体的には、まず、本実施形態における加熱コイル３０は、図１４（Ａ）に示すように、１本のコイル部材が渦巻状に巻回されて形成されている。そして、渦巻状の加熱コイル３０の中心付近（内部側）に位置する主加熱コイル部３１は、図１４（Ｂ）に示すように、加熱対象となる鋼板Ｐ１の表面に近接（あるいは接触）するよう配置される。また、加熱コイル３０の外周付近（外周側）つまり上記主加熱コイル部３１の周囲に位置する補助加熱コイル部３２は、図１４（Ｂ）に示すように、鋼板Ｐ１の表面に対して上記主加熱コイル部３１よりも離れて配置されている。 In addition to the configuration of the third embodiment described above, the strain relief heating device 1 in the present embodiment further includes a cooling unit 33 having the same function as that described in the fourth embodiment on the outermost periphery. Specifically, first, as shown in FIG. 14A, the heating coil 30 in the present embodiment is formed by winding one coil member in a spiral shape. And the main heating coil part 31 located in the center vicinity (inner side) of the spiral heating coil 30 approaches (or contacts) the surface of the steel plate P1 to be heated as shown in FIG. 14B. Arranged so that. Further, the auxiliary heating coil part 32 located near the outer periphery of the heating coil 30 (on the outer peripheral side), that is, around the main heating coil part 31, is, as shown in FIG. The heating coil unit 31 is arranged away from the heating coil unit 31.
　そして、さらに本実施形態では、補助加熱コイル部３２から所定の距離だけ離れてさらに外側に位置し、補助加熱コイル部３２を取り囲んで、鋼板Ｐ１との対向面に貫通孔（図示せず）を有する環状の冷却部３３を備えている。この冷却部３３の内部には水が流れており、貫通孔から水が鋼板Ｐ１に向かって排出される。 Further, in the present embodiment, the auxiliary heating coil portion 32 is further away from the auxiliary heating coil portion 32 by a predetermined distance, surrounds the auxiliary heating coil portion 32, and a through hole (not shown) is formed on the surface facing the steel plate P1. An annular cooling part 33 is provided. Water flows inside the cooling section 33, and water is discharged from the through hole toward the steel plate P1.
　これにより、上述同様に、主加熱コイル部３１及び補助加熱コイル部３２にて、鋼板Ｐ１を、主加熱コイル部３１の対向箇所を中心として広範囲で外側から中心に向かって徐々に加熱強度が強くなるよう加熱することができる。これと同時に、最外周側は、冷却部３３から排出された水などの冷却物質で冷却されるため、外側の過度の加熱を抑制することができ、熱膨張による鋼板Ｐ１の不要な変形を防止することができる。 Thus, as described above, the heating intensity of the steel plate P1 is gradually increased from the outside toward the center in a wide range with the main heating coil part 31 and the auxiliary heating coil part 32 as the center, at the location facing the main heating coil part 31. It can be heated. At the same time, since the outermost peripheral side is cooled by a cooling substance such as water discharged from the cooling unit 33, excessive heating on the outside can be suppressed, and unnecessary deformation of the steel sheet P1 due to thermal expansion can be prevented. can do.
　なお、冷却部３３は、主加熱コイル部３１及び補助加熱コイル部３２と連結して一本のコイル部材が渦巻状に巻回されて形成されていてもよい。この場合には、冷却部３３から排出される水は、主加熱コイル部３１及び補助加熱コイル部３２を流れるものと同様となる。また、補助加熱コイル部３２に貫通孔を形成して、当該補助加熱コイル部３２に冷却部３３の機能を設けてもよい。 The cooling unit 33 may be formed by connecting the main heating coil unit 31 and the auxiliary heating coil unit 32 and winding one coil member in a spiral shape. In this case, the water discharged from the cooling unit 33 is the same as that flowing through the main heating coil unit 31 and the auxiliary heating coil unit 32. Further, a through hole may be formed in the auxiliary heating coil part 32, and the function of the cooling part 33 may be provided in the auxiliary heating coil part 32.
　なお、上述した各実施形態において、加熱コイルは直線状の部位を有する構成であるものとして説明したが、加熱コイルを構成する主加熱コイル部や補助加熱コイル部は、直線形状でなくてもよく、曲線形状であってもよい。例えば、実施形態３で説明した加熱コイル部３０は、略四角形の渦巻き状であることに限定されず、円形の渦巻き状であってもよい。また、加熱コイルの形状はいかなる形状であってもよい。そして、これに伴い、冷却部も直線形状でなくてもよく、曲線形状であってもよい。 In each of the above-described embodiments, the heating coil has been described as having a linear portion. However, the main heating coil portion and the auxiliary heating coil portion that constitute the heating coil may not be linear. It may be a curved shape. For example, the heating coil unit 30 described in the third embodiment is not limited to a substantially rectangular spiral shape, and may be a circular spiral shape. The shape of the heating coil may be any shape. And in connection with this, a cooling part may not be a linear shape, and a curve shape may be sufficient as it.
　また、上記実施形態では、船舶用の鋼板といった溶接により生じた歪みを取り除くために用いる加熱装置としての構成を説明したが、当該加熱装置は必ずしも歪みを取り除くためだけに使用されることに限定されない。上述したような加熱コイルを備えた加熱装置は、曲げ加工のために金属部材を加熱するなど、いかなる目的のために加熱対象となる部材を加熱するために用いてもよい。 Moreover, although the said embodiment demonstrated the structure as a heating apparatus used in order to remove the distortion produced by welding, such as a steel plate for ships, the said heating apparatus is not necessarily limited to being used only for removing a distortion. . The heating device including the heating coil as described above may be used to heat a member to be heated for any purpose, such as heating a metal member for bending.
　以上、上記実施形態等を参照して本願発明を説明したが、本願発明は、上述した実施形態に限定されるものではない。本願発明の構成や詳細には、本願発明の範囲内で当業者が理解しうる様々な変更をすることができる。 As mentioned above, although this invention was demonstrated with reference to the said embodiment etc., this invention is not limited to embodiment mentioned above. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.
　なお、本発明は、２０１２年９月２５日に国際特許出願されたＰＣＴ／ＪＰ２０１２／００６０６８に基づく優先権主張の利益を享受するものであり、当該国際特許出願に記載された内容は、全て本明細書に含まれるものとする。 The present invention enjoys the benefit of the priority claim based on PCT / JP2012 / 006068, which was filed on September 25, 2012, and all the contents described in the international patent application are It shall be included in the description.
１　歪み取り用加熱装置
２　本体
３　車輪
４　手押し部
１０，２０，３０　加熱コイル
１１，２１ａ，２１ｂ，３１　主加熱コイル部
１２ａ，１２ｂ，２２ａ，２２ｂ，３２　補助加熱コイル部
１３，１４，２３，２４　入力端
１５，２５　コア部材
２６ａ，２６ｂ，３３　冷却部
２６ａａ，２６ｂａ　貫通孔
２７ａ，２７ｂ　支持管
２８ａ，２８ｂ　冷却物質
Ｐ１　鋼板
Ｗ１，Ｗ２　溶接材料
  DESCRIPTION OF SYMBOLS 1 Heating apparatus 2 for distortion removal Main body 3 Wheel 4 Hand pushing part 10,20,30 Heating coil 11,21a, 21b, 31 Main heating coil part 12a, 12b, 22a, 22b, 32 Auxiliary heating coil part 13,14,23, 24 Input ends 15, 25 Core members 26a, 26b, 33 Cooling portions 26aa, 26ba Through holes 27a, 27b Support tubes 28a, 28b Coolant P1 Steel plates W1, W2 Welding material

Claims (8)

  1. 　加熱対象となる裏面側の一部が溶接された鋼板を表面側から加熱して、溶接による前記鋼板の歪みを取り除く歪み取り用加熱装置であって、
    　前記鋼板の表面に対向して配置され、供給された高周波電流が流れることにより前記鋼板を誘導加熱する第一のコイル部と第二のコイル部とを備え、
    　前記第一のコイル部は、前記鋼板の表面に接触あるいは近接して配置され、
    　前記第二のコイル部は、前記鋼板の表面に対して、当該鋼板の表面に対する前記第一のコイル部の距離よりも離れて配置されると共に、前記第一のコイル部から所定の距離だけ離れた当該第一のコイル部の周囲に配置され、さらに、前記第一のコイル部を挟むよう当該第一のコイル部の両側方に位置して配置される、
    歪み取り用加熱装置。     A heating apparatus for strain relief that removes distortion of the steel sheet due to welding by heating a steel sheet on which a part of the back side to be heated is welded from the front side,
    A first coil portion and a second coil portion that are arranged to face the surface of the steel plate and induction-heat the steel plate by flowing a supplied high-frequency current,
    The first coil portion is disposed in contact with or close to the surface of the steel plate,
    The second coil portion is disposed away from the surface of the steel plate by a predetermined distance from the first coil portion, and is disposed away from the distance of the first coil portion relative to the surface of the steel plate. Arranged around the first coil part, and further, located on both sides of the first coil part so as to sandwich the first coil part,
    Heating device for strain relief.
  2. 　請求項１に記載の歪み取り用加熱装置であって、
    　前記鋼板の表面に対向して配置され、当該鋼板を冷却する冷却部を備え、
    　前記冷却部は、前記第一のコイル部の周囲に、少なくとも当該第一のコイル部を挟むよう当該第一のコイル部の両側方に位置して配置される、
    歪み取り用加熱装置。     The strain relief heating device according to claim 1,
    It is arranged to face the surface of the steel plate, and includes a cooling unit that cools the steel plate,
    The cooling unit is disposed on both sides of the first coil unit so as to sandwich at least the first coil unit around the first coil unit.
    Heating device for strain relief.
  3. 　請求項２に記載の歪み取り用加熱装置であって、
    　前記冷却部は、前記第二のコイル部から所定の距離だけ離れて、前記第一のコイル部側とは反対側の側方に位置し、前記第一のコイル部を挟むよう配置されている前記第二のコイル部をさらに挟むよう配置されている、
    歪み取り用加熱装置。     A heating apparatus for strain relief according to claim 2,
    The cooling part is located at a side away from the second coil part by a predetermined distance, on the side opposite to the first coil part side, and is arranged so as to sandwich the first coil part. Arranged to further sandwich the second coil part,
    Heating device for strain relief.
  4. 　請求項２又は３に記載の歪み取り用加熱装置であって、
    　前記冷却部は、前記鋼板の表面に対して、少なくとも当該鋼板の表面に対する前記第一のコイル部の距離よりも離れて配置されており、前記鋼板の表面と対向する部位から当該鋼板の表面に向かって冷却物質を排出することにより当該鋼板を冷却するよう構成されている、
    歪み取り用加熱装置。     A heating device for strain relief according to claim 2 or 3,
    The cooling part is disposed at least with respect to the surface of the steel sheet, at a distance greater than the distance of the first coil part with respect to the surface of the steel sheet, and from the portion facing the surface of the steel sheet to the surface of the steel sheet. It is configured to cool the steel sheet by discharging the cooling material toward the
    Heating device for strain relief.
  5. 　請求項２乃至４のいずれかに記載の歪み取り用加熱装置であって、
    　前記第一のコイル部と前記第二のコイル部と前記冷却部とは、それぞれ前記鋼板の表面に沿って延びる直線状に形成されると共に、それぞれがほぼ平行に配置される、
    歪み取り用加熱装置。     A heating apparatus for strain relief according to any one of claims 2 to 4,
    The first coil part, the second coil part, and the cooling part are each formed in a straight line extending along the surface of the steel sheet, and are arranged substantially in parallel.
    Heating device for strain relief.
  6. 　請求項２乃至４のいずれかに記載の歪み取り用加熱装置であって、
    　前記第一のコイル部と前記第二のコイル部とは、相互に接続された１つのコイルにて形成される共に、当該コイルは渦巻状に巻回されて形成されており、
    　前記第一のコイル部が、渦巻状の前記コイルの内部側に位置し、前記第二のコイル部が、渦巻状の前記コイルの外周側に位置し、
    　前記冷却部が、前記第二のコイル部から所定の距離だけ離れて当該第二のコイル部のさらに外側に位置し、当該第二のコイル部を取り囲んで配置されている、
    歪み取り用加熱装置。     A heating apparatus for strain relief according to any one of claims 2 to 4,
    The first coil portion and the second coil portion are formed by one coil connected to each other, and the coil is formed by being wound in a spiral shape,
    The first coil part is located on the inner side of the spiral coil, and the second coil part is located on the outer peripheral side of the spiral coil,
    The cooling unit is located at a predetermined distance away from the second coil unit and further outside the second coil unit, and is disposed surrounding the second coil unit.
    Heating device for strain relief.
  7. 　加熱対象となる板材の表面に対向して配置され、供給された高周波電流が流れることにより前記板材を誘導加熱する第一のコイル部と第二のコイル部とを備え、
    　前記第一のコイル部は、前記板材の表面に接触あるいは近接して配置され、
    　前記第二のコイル部は、前記板材の表面に対して、当該板材の表面に対する前記第一のコイル部の距離よりも離れて配置されると共に、前記第一のコイル部から所定の距離だけ離れた当該第一のコイル部の周囲に配置され、さらに、前記第一のコイル部を挟むよう当該第一のコイル部の両側方に位置して配置される、
    加熱装置。     It is arranged opposite to the surface of the plate material to be heated, and includes a first coil portion and a second coil portion that inductively heat the plate material when the supplied high-frequency current flows,
    The first coil portion is disposed in contact with or close to the surface of the plate material,
    The second coil portion is disposed away from the surface of the plate material by a predetermined distance from the surface of the plate material, and further away from the first coil portion. Arranged around the first coil part, and further, located on both sides of the first coil part so as to sandwich the first coil part,
    Heating device.
  8. 　請求項７に記載の加熱装置であって、
    　前記板材の表面に対向して配置され、当該板材を冷却する冷却部を備え、
    　前記冷却部は、前記第一のコイル部の周囲に、少なくとも当該第一のコイル部を挟むよう当該第一のコイル部の両側方に位置して配置される、
    加熱装置。     A heating device according to claim 7,
    It is arranged facing the surface of the plate material, and includes a cooling unit that cools the plate material,
    The cooling unit is disposed on both sides of the first coil unit so as to sandwich at least the first coil unit around the first coil unit.
    Heating device.
PCT/JP2013/005402 2012-09-25 2013-09-12 Heating device for stress relief WO2014049999A1 (en)

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CN104661789A (en) 2015-05-27
CN104661789B (en) 2016-11-23

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