JP5578325B2 - Electromagnetic induction heating coil, electromagnetic induction heating device, and method for heating metal body - Google Patents

Description

  The present invention relates to an electromagnetic induction heating coil used for an application of heating a metal body by electromagnetic induction while moving the metal body, and an electromagnetic induction heating apparatus using the electromagnetic induction heating coil. Moreover, this invention relates to the heating method of the metal body which generates an eddy current by sending an electric current through an electromagnetic induction heating coil, and heats the said metal body.

  As a method for heating a metal, a method using electromagnetic induction heating is known. When a current is passed through an electromagnetic induction heating coil arranged on the metal body to generate a strong magnetic field, an eddy current is generated by the electromagnetic induction, and the metal body is heated.

  For example, Patent Document 1 below discloses an electric induction heating device for heating a strip such as a metal body sent in a predetermined flow direction by electromagnetic induction. The electromagnetic induction heating device described in Patent Document 1 includes a plurality of magnetic pole segments arranged in parallel to each other in the plate width direction of the strip and facing the strip, and the magnetic pole segments are arranged in the thickness direction of the strip. In addition, a drive mechanism for moving the magnetic pole segment independently of the other magnetic pole segments, and an electromagnetic induction heating coil provided so as to surround the plurality of magnetic pole segments, respectively. The electromagnetic induction heating device described in Patent Document 1 further includes a cooling unit for cooling the edge portion of the strip in order to prevent the edge portion of the strip from being locally heated to a high temperature. The cooling means is provided in order to prevent eddy currents from concentrating on the edge portion of the strip and heating the edge portion more than other portions. As the cooling means, specifically, means for blowing air to the edge portion of the strip which is easily heated locally by an air blow nozzle is used.

Japanese Patent Laid-Open No. 2001-6860

  As described in the electromagnetic induction heating device described in Patent Document 1, the method of cooling a metal body portion that is easily heated locally by using a cooling means such as an air blow nozzle, the temperature of the metal body is set with high accuracy. It is difficult to control. Specifically, the metal body may not be sufficiently suppressed from being locally heated to a high temperature, or conversely, the temperature may locally decrease. Furthermore, in the electromagnetic induction heating apparatus described in Patent Document 1, cooling means such as an air blow nozzle must be provided separately, and the air blowing speed and the amount of blowing must be controlled.

  An object of the present invention is an electromagnetic induction heating coil for heating a metal body by electromagnetic induction while moving the metal body, the electromagnetic induction heating coil capable of uniformly heating the metal body, and the electromagnetic An electromagnetic induction heating apparatus using an induction heating coil and a method for heating a metal body are provided.

  An electromagnetic induction heating coil according to the present invention is an electromagnetic induction heating coil for heating a metal body by electromagnetic induction while moving the metal body, and has a length direction and a width direction, and has two or more layers. A conductive wire is wound around the first and second conductive wire portions arranged side by side in the direction in which the conductive wires are laminated. There is provided an electromagnetic induction heating coil having a region where the first winding wire portion and the second winding wire portion do not overlap each other on one end side in the length direction of the coil.

  On the specific situation with the electromagnetic induction heating coil which concerns on this invention, it has shifted | deviated to the length direction of the coil in the one end side of the length direction of a coil, The said 1st winding conducting wire part and the said 2nd winding conducting wire The part has the non-overlapping area.

  In another specific aspect of the electromagnetic induction heating coil according to the present invention, the first wound wire portion and the second wound wire portion are formed so that the wound wire is curved in the non-overlapping region. It has a curved part that extends.

  In another specific aspect of the electromagnetic induction heating coil according to the present invention, the first winding wire portion and the second winding wire portion have the curved portion in the entire non-overlapping region.

  In another specific aspect of the electromagnetic induction heating coil according to the present invention, each of the first and second wound conductive wire portions includes a first straight portion in which the wound conductive wire extends linearly and the wound wound wire described above. The conductive wire has a second straight line portion extending linearly, and the curved portion having one end connected to the first straight line portion and the other end connected to the second straight line portion.

  In still another specific aspect of the electromagnetic induction heating coil according to the present invention, the curved portion has an arc shape protruding toward the outside in the length direction of the coil.

  It is preferable that the maximum distance of deviation between the first winding conductor and the second winding conductor in the length direction of the coil is 7 mm or more and 16 mm or less.

  On the other specific situation of the electromagnetic induction heating coil which concerns on this invention, the said 1st winding conducting wire part and the said 2nd winding conducting wire part are formed of the same 1 conducting wire.

  The electromagnetic induction heating device according to the present invention includes an electromagnetic induction heating coil configured according to the present invention, and a current supply device for causing a current to flow through the electromagnetic induction heating coil.

  Moreover, according to the wide situation of this invention, the electromagnetic induction heating coil comprised according to this invention is made into the said 1st winding conducting wire part and the said 2nd winding conducting wire part on at least one surface of a metal body. Arrange the areas that do not overlap each other to face the surface of the metal body, move the metal body, and generate an eddy current by flowing current through the electromagnetic induction heating coil to heat the metal body A method for heating a metal body is provided.

  In a specific aspect of the method for heating a metal body according to the present invention, the electromagnetic induction heating is performed so that a direction orthogonal to a moving direction of the metal body and a length direction of the electromagnetic induction heating coil are substantially parallel to each other. A coil is disposed to heat the metal body.

  In another specific aspect of the method for heating a metal body according to the present invention, the distance of the gap between the metal body and the electromagnetic induction heating coil is such that the first winding wire portion and the above in the length direction of the coil The metal body and the electromagnetic induction heating coil are arranged to heat the metal body so as to be 0.74 times or more of the maximum distance of deviation from the second winding wire portion.

  The electromagnetic induction heating coil according to the present invention has a length direction and a width direction, and is formed by winding a conductive wire in two or more layers, and the conductive wire is wound in two or more layers. The first winding wire portion and the second winding wire portion arranged side by side in the laminating direction of the coil, and at one end side in the length direction of the coil, the first winding wire portion and the second winding wire. Since the conductor portion has a region that does not overlap with each other, the metal body is heated uniformly by electromagnetic induction while moving the metal body using the electromagnetic induction heating coil according to the present invention. can do.

FIG. 1 is a perspective view showing an electromagnetic induction heating apparatus provided with an electromagnetic induction heating coil according to an embodiment of the present invention. FIG. 2 is a plan view showing an electromagnetic induction heating apparatus including an electromagnetic induction heating coil according to an embodiment of the present invention. FIG. 3 is a view for explaining the positional relationship between the electromagnetic induction heating device shown in FIG. 1 and a metal body. FIG. 4 is a front view showing another example of arrangement of the electromagnetic induction heating coil shown in FIG. 1 on the surface of the metal body. FIGS. 5A to 5C are diagrams for explaining the deviation distance of the non-overlapping portions of the electromagnetic induction heating coil. FIG. 6 is a front view showing another arrangement example of the electromagnetic induction heating coil shown in FIG. 1 on the surface of the metal body. FIG. 7 is a front view showing another arrangement example of the electromagnetic induction heating coil shown in FIG. 1 on the surface of the metal body. FIG. 8 is a plan view showing a modification of the electromagnetic induction heating coil. FIG. 9 is a front view showing another modification of the electromagnetic induction heating coil. FIG. 10 is a schematic diagram for explaining an example of the use of the electromagnetic induction heating coil shown in FIG.

  Hereinafter, the present invention will be clarified by describing specific embodiments of the present invention with reference to the drawings.

  FIG. 1 is a perspective view of an electromagnetic induction heating apparatus including an electromagnetic induction heating coil according to an embodiment of the present invention. FIG. 2 is a plan view of the electromagnetic induction heating device shown in FIG. 1-2, the state by which the electromagnetic induction heating coil of the electromagnetic induction heating apparatus was arrange | positioned on the surface of a metal body is shown.

  The electromagnetic induction heating device 21 shown in FIGS. The coil 1 is an electromagnetic induction heating coil. Specifically, the coil 1 is an electromagnetic induction heating coil for heating the metal body 22 by electromagnetic induction while moving the metal body 22. The coil 1 is used for the purpose of heating the metal body 22 by electromagnetic induction while moving the metal body 22. The metal body 22 is an object to be heated.

  In FIGS. 1 and 2, the electromagnetic induction heating coil 1 is disposed on the first surface 22 a of the metal body 22. When the metal body 22 is heated, for example, the metal body 22 is moved in the direction indicated by the arrow X. The metal body 22 is long and has a length direction and a width direction. 1 and 2, the metal body 22 is moved in the length direction of the metal body 22. The metal body 22 is, for example, a plate-like body.

  The coil 1 has a length direction and a width direction. The coil 1 is formed by winding a conductive wire in two or more layers. The conducting wire is wound so that the coil 1 has a length direction and a width direction. The coil 1 is formed by winding a conducting wire in a ring shape.

  On one end 1a side in the length direction of the coil 1, the conducting wire is laminated in two or more layers, and on the other end 1b side in the coil length direction, the conducting wire is not laminated in two or more layers. Some areas of the electromagnetic induction heating coil and some areas of the conducting wire may not be stacked in two or more layers. For example, the conductive wire is laminated in two or more layers on one end side in the length direction of the electromagnetic induction heating coil, and the conductive wire is not laminated in two or more layers on the other end side in the length direction of the electromagnetic induction heating coil. May be. The other end 1b indicates a portion where the conducting wire is wound, and excludes a portion where the conducting wire is not wound.

  The coil 1 has the 1st winding conducting wire part 11 and the 2nd winding conducting wire part 12 arrange | positioned along with the lamination direction of conducting wire by winding conducting wire in two or more layers.

  The coil 1 is formed by one conducting wire. The first winding wire portion 11 and the second winding wire portion 12 are formed by one and the same conducting wire. Both ends of the conducting wire forming the coil 1 are connected to a current supply device 23 for flowing a current through the coil 1. The current supply device 23 is disposed on the other end 1 b side of the coil 1.

  The coil 1 has a region R in which the first winding wire portion 11 and the second winding wire portion 12 arranged side by side in the conducting wire stacking direction do not overlap each other on the one end 1a side in the length direction of the coil 1. Have Specifically, in the coil 1, in the length direction of the coil 1, the first and second winding wires are arranged such that the first winding wire portion 11 is displaced inward and the second winding wire portion 12 is displaced outward. Portions 11 and 12 are formed. In other words, the 1st winding conducting wire part 11 is wound relatively small, and the 2nd winding conducting wire part 12 is wound relatively large.

  One of the main features of the present embodiment is that, on the one end 1a side in the length direction of the coil 1, a first winding lead portion 11 and a second winding lead portion 12 arranged side by side in the conductor stacking direction, That is, the coil 1 has a region R that does not overlap each other.

  The coil 1 has the area | region R in which the 1st winding conducting wire part 11 and the 2nd winding conducting wire part 12 do not mutually overlap in the lamination direction of conducting wire. If the first and second winding conductors overlap each other on one end side in the length direction of the electromagnetic induction heating coil, eddy currents are generated in the metal part facing the overlapping region. It concentrates and the metal body is easily heated locally to a high temperature. On the other hand, by providing the non-overlapping region R, it is difficult for eddy currents to concentrate on the metal body portion facing the non-overlapping region R, and the metal body is prevented from being heated locally. And the metal body can be heated uniformly.

  The region R in which the first winding wire portion 11 and the second winding wire portion 12 do not overlap each other because the coil 1 is shifted in the length direction of the coil 1 on the one end 1a side in the length direction of the coil 1. Have Thus, the non-overlapping region R is preferably provided by being shifted in the length direction of the coil 1 at one end 1 a in the length direction of the coil 1. By providing the region R that does not overlap due to such a deviation in a specific direction, it is possible to more effectively suppress the metal body from being heated locally.

  The 1st winding conducting wire part 11 has the curved part 11a where the wound conducting wire extends in the shape of a curve in the whole area | region R which has not overlapped. The 2nd winding conducting wire part 12 has the curve part 12a in which the wound conducting wire extends in the shape of a curve over the whole area | region R which has not overlapped. The curved portions 11a and 12a have an arc shape protruding outward in the length direction of the coil. The curved portions 11 a and 12 a are located at one end in the length direction of the coil 1. As described above, when the first winding lead portion 11 and the second winding lead portion 12 have the curved portions 11a and 12a in the entire region R that does not overlap, the coil 1 faces the one end 1a in the length direction. It becomes more difficult for eddy currents to concentrate on the metal body 22 portion, and the metal body 22 can be more effectively suppressed from being locally heated. In addition, if the curved portions 11a and 12a are arc shapes protruding toward the outside in the length direction of the coil, the metal body 22 can be heated more uniformly.

  The first winding wire portion 11 includes a first straight portion 11b in which the wound lead wire extends linearly, a second straight portion 11c in which the wound lead wire extends linearly, and a first straight portion 11b. And a curved portion 11a having one end connected to the second linear portion 11c and the other end connected to the second straight portion 11c. The first and second straight portions 11 b and 11 c extend in the length direction of the coil 1. The 1st linear part 11b and the 2nd linear part 11c are arrange | positioned substantially parallel. The first straight part 11b and the second straight part 11c are opposed to each other.

  The second winding conductor portion 12 includes a first straight portion 12b in which the wound conductor wire extends linearly, a second straight portion 12c in which the wound conductor wire extends linearly, and a first straight portion 12b. And a curved portion 12a that is continuous with one end and that is connected with the second straight portion 12c. The first and second straight portions 12 b and 12 c extend in the length direction of the coil 1. The first straight part 12b and the second straight part 12c are arranged substantially in parallel. The first straight portion 12b and the second straight portion 12c are opposed to each other.

  As described above, when the two first and second straight portions are connected to one curved portion, the metal body portion facing the curved portion tends to be heated to a higher temperature than the other portions. . However, since the curved portion 11a and the curved portion 12a do not overlap in the direction in which the conductive wires are laminated, the metal body portion facing the curved portions 11a and 12a is less likely to be heated to a higher temperature than the other portions. As a result, the metal body 22 can be heated uniformly.

  In addition, the 2nd straight line part 11c of the 1st winding conducting wire part 11 is continued to the end of the curved part 13, and the 1st straight line part 12b of the 2nd winding conducting wire part 12 is the other end of the curving part 13. It is connected to. Therefore, the coil 1 includes the first straight portion 11b, the curved portion 11a, the second straight portion 11c, the curved portion 13, the first straight portion 12b, the curved portion 12a, and the second straight portion. 12c are connected in this order. The end of the first linear portion 11 b opposite to the curved portion 11 a side is connected to the current supply device 23. The end of the second straight line portion 11 c opposite to the curved portion 12 a side is connected to the current supply device 23.

  As shown in FIGS. 1 to 3, when the metal body 22 is heated using the electromagnetic induction heating device 21 provided with the electromagnetic induction heating coil 1, electromagnetic induction is performed on the first surface 22 a of the metal body 22. A heating coil 1 is arranged. At this time, the coil 1 is arranged so that the region R where the first winding conductor portion 11 and the second winding conductor portion 12 do not overlap each other faces the first surface 22 a of the metal body 22. That is, the coil 1 is arranged so that the non-overlapping region R is located on the first surface 22 a of the metal body 22.

  Here, the coil 1 is arranged so that the first winding lead portion 11 is on the metal body 22 side and the second winding lead portion 12 is on the side opposite to the metal body 22 side. On the one end 1 a side in the length direction of the coil 1, the first winding wire portion 11 that is relatively close to the metal body 22 is displaced inward, and the second winding wire portion 12 that is relatively far from the metal body 22 is displaced outward. ing.

  1-3, the metal body 22 is moved in the direction of the arrow X, and an eddy current is generated by causing a current to flow from the current supply device 23 to the coil 1. As a result, the metal body 22 is heated. The metal body 22 may be moved in the direction opposite to the direction of the arrow X.

  As shown in FIGS. 1-2, the electromagnetic induction heating coil 1 so that the direction orthogonal to the moving direction (direction of arrow X) of the metal body 22 and the length direction of the electromagnetic induction heating coil 1 are substantially parallel. It is preferable to heat the metal body 22 by arranging the above. In this case, the metal body 22 can be effectively heated over a wide range.

  1-3, the coil 1 is arrange | positioned so that the 1st winding conducting wire part 11 may become the metal body 22 side, and the 2nd winding conducting wire part 12 may be on the opposite side to the metal body 22 side. As shown in FIG. 4, the coil 1 is turned upside down on the first surface 22 a of the metal body 22, so that the second winding conductor 12 is on the metal body 22 side, and the first winding conductor 11 is metal. The coil 1 may be arrange | positioned so that it may become the opposite side to the body 22 side. On the one end 1 a side in the length direction of the coil 1, the second winding wire portion 12 relatively close to the metal body 22 is shifted to the outside, and the first winding wire portion 11 relatively far from the metal body 22 is shifted to the inside. Thus, the 1st, 2nd winding conducting wire parts 11 and 12 are arranged. In other words, at one end in the length direction of the coil 1, the first winding wire portion 12 that is relatively close to the metal body 22 is largely wound, and the first winding wire portion 11 that is relatively far from the metal body 22 is wound. The 1st, 2nd winding conducting wire parts 11 and 12 may be arrange | positioned so that it may be wound small.

  The length direction dimension L (mm) of the coil 1 only needs to exceed the width direction dimension W of the coil 1 and can be arbitrarily selected. The length direction dimension L is not particularly limited. The length direction dimension L is preferably 20 mm or more, more preferably 100 mm or more. The length direction dimension L of the coil 1 is appropriately determined according to the length direction dimension L2 (mm) of the metal body 22 to be heated. The length direction dimension L of the coil is preferably smaller than the length direction dimension L2 of the metal body 22 to be heated. L ≦ (L2-10) is preferable, and L ≦ (L2-15) is more preferable.

  As shown in FIGS. 5A to 5C, the maximum distance D1 of deviation between the first winding wire portion 11 and the second winding wire portion 12 in the length direction of the coil 1 can be changed as appropriate. it can. The maximum shift distance D1a of the coil 1A shown in FIG. 5A is smaller than the maximum shift distance D1b of the coil 1B shown in FIG. The maximum shift distance D1b of the coil 1B shown in FIG. 5B is smaller than the maximum shift distance D1c of the coil 1C shown in FIG. The maximum distance D1 of the deviation between the first winding lead portion 11 and the second winding lead portion 12 in the length direction of the coil 1 is preferably 7 mm or more, and preferably 16 mm or less.

  As shown in FIG. 3, the gap distance D <b> 2 between the metal body 22 and the electromagnetic induction heating coil 1 is such that the first winding wire portion 11 and the second winding wire portion 12 in the length direction of the coil 1. It is preferable to heat the metal body 22 by arranging the metal body 22 and the electromagnetic induction heating coil 1 so as to be 0.74 times or more of the maximum distance of deviation. In this case, the metal body 22 can be heated more uniformly.

  As shown in FIG. 6, two electromagnetic induction heating coils 1 may be stacked on the first surface 22 a of the metal body 22. Here, with respect to one coil 1, two coils 1 and 1 are arranged in a state where the other coil 1 is inverted in the length direction. In this case, the metal body can be heated more effectively. Furthermore, it can suppress more effectively that a metal body is locally heated in the one end and other end side of the width direction of a metal body.

  As shown in FIG. 7, the coil 1 may be arranged not only on the first surface 22 a of the metal body 22 but also on the second surface 22 b opposite to the first surface 22 a.

  In the coil 1 shown in FIGS. 1-3, the 1st winding conducting wire part 11 and the 2nd winding conducting wire part 12 have the curve parts 11a and 12a in the whole area | region R which has not overlapped. Like the coil 31 shown in FIG. 8, the winding wire portion 33 of the first winding wire portion 32 has curved portions 32a and 33a in which the wound conducting wire extends in a curved shape in a part of the region R that does not overlap. You may have. In the coil 31, the first winding wire portion 32 has two curved portions 32a in a region R that does not overlap. The two curved portions 32a are connected to one end and the other end of a straight portion 32b in which a wound conductive wire extends linearly. The second winding wire portion 33 has two curved portions 33a in a region R that does not overlap. The two curved portions 33a are connected to one end and the other end of a straight portion 33b in which a wound conductive wire extends linearly.

  A coil 1 shown in FIG. 1 has a first winding conductor portion 11 and a second winding conductor portion 12 arranged side by side in the conducting wire laminating direction, and the conducting wires are wound in two layers. As shown in FIG. 9, the coil 41 has a first winding conductor portion 42, a second winding conductor portion 43, and a third winding conductor portion 44 that are arranged side by side in the conductor lamination direction. A conducting wire may be wound around. Furthermore, a conducting wire may be wound on four or more layers.

  The coil 41 has a region R where the first winding wire portion 42, the second winding wire portion 43, and the third winding wire portion 44 do not overlap each other on the one end 41 a side in the length direction of the coil 41. Thus, it is preferable to have the area | region R in which the 1st winding wire part, the 2nd winding wire part, and the 3rd winding wire part do not mutually overlap in the one end side of the length direction of a coil. In this case, the metal body 22 can be heated more uniformly. However, on the one end side in the length direction of the coil, the third winding conductor portion may not have a region that does not overlap with the first winding conductor portion, and overlaps with the second winding conductor portion. It is not necessary to have a region that does not exist.

  The electromagnetic induction heating coil 1 is used for various applications in which a metal body is heated. The electromagnetic induction heating coil 1 can be used for, for example, an application for obtaining a metal body covered with a resin layer.

  More specifically, as shown in FIG. 10, for example, the electromagnetic induction heating coil 1 heats the metal body 22 while rotating the rollers 61 and 62 and moving the metal body 22. In a state where the metal body 22 is heated, the resin sheet 51 is laminated on the first surface 22 a of the metal body 22 while being pressed by the roller 63, and the resin sheet 51 is heated by the heat of the metal body 22. Thereby, the metal body 22 and the resin sheet 51 are bonded. In this way, a metal body covered with the resin layer can be obtained. The electromagnetic induction heating coil according to the present invention can be used for other purposes. In addition, in FIG. 10, the electromagnetic induction heating apparatus 21 is shown schematically.

  Hereinafter, specific examples and comparative examples of the present invention will be given to clarify the effects of the present invention.

Example 1
As the metal body, SUS304 having a thickness of 0.3 mm and a width direction dimension of 400 mm was prepared. An electromagnetic induction heating coil 1 shown in FIG. 1 was prepared. The length direction dimension L of the coil 1 was 360 mm, the width direction dimension of the coil 1 was 60 mm, and the maximum distance D1 of the deviation of the non-overlapping region R was 10 mm.

  The coil 1 was arrange | positioned on the surface of a metal body. The gap distance D2 between the metal body and the electromagnetic induction heating coil 1 was 10 mm. Further, in the length direction of the coil 1, the first winding wire portion 11 relatively close to the metal body is shifted inward, and the second winding wire portion 12 relatively far from the metal body 22 is shifted outward. The 1st, 2nd winding conducting wire parts 11 and 12 were arranged.

  The metal body was moved at a moving speed of 1.2 m / min, and a current of 24 A was passed through the coil 1 at a high frequency of 400 kHz to heat the metal body.

(Example 2)
The metal body was heated using a coil configured in the same manner as in Example 1 except that the maximum distance D1 of the shift of the non-overlapping region R was changed from 10 mm to 7 mm.

Example 3
The metal body was heated using a coil configured in the same manner as in Example 1 except that the maximum distance D1 of the shift of the non-overlapping region R was changed from 10 mm to 15 mm.

Example 4
The metal body was heated in the same manner as in Example 1 except that the moving speed of the metal body was changed from 1.2 m / min to 1.8 m / min.

(Comparative Example 1)
The metal body was heated using a coil configured in the same manner as in Example 1 except that there was no non-overlapping region R and the shift distance D1 was changed to 0 mm.

(Evaluation)
It was evaluated whether the metal body was heated uniformly in the width direction of the metal body.

  The temperature of the whole metal body in the width direction was observed with a thermoviewer, and the temperature was measured. When the temperature of the metal body facing the central portion of the coil was T (° C.), the portion where the temperature of the metal body was 0.95 T or higher and 1.05 T or lower was defined as the uniform heating range. The distance in the width direction of the metal body in the uniform heating range was used as an index as to whether or not the metal body was uniformly heated. The larger the uniform temperature range, the better.

  Whether the metal body was uniformly heated in the width direction of the metal body was determined according to the following criteria.

[Criteria]
◯: The distance in the width direction of the metal body in the uniform heating range is 100% or more relative to the length direction dimension L of the coil. ○: The width of the metal body in the uniform heating range with respect to the dimension L in the coil length direction. The distance in the direction is 97% or more and less than 100%. Δ: The distance in the width direction of the metal body in the uniform heating range with respect to the dimension L in the coil length direction is 90% or more and less than 97%. The distance in the width direction of the metal body in the uniform heating range with respect to the dimension L is less than 90%. The results are shown in Table 1 below.

  As shown in Table 1, it can be seen that the presence of a region that does not overlap the coil 1 allows the metal body to be heated uniformly. In addition, when the moving speed of the metal body is changed, the temperature of the metal body changes, but the distance in the width direction in which the metal body is uniformly heated does not change greatly.

DESCRIPTION OF SYMBOLS 1 ... Coil 1a ... One end 1b ... Other end 1A-1C ... Coil 11 ... 1st winding wire part 11a ... Curved part 11b ... 1st straight line part 11c ... 2nd straight line part 12 ... 2nd winding wire part 12a ... curve portion 12b ... first straight portion 12c ... second straight portion 13 ... curve portion 21 ... electromagnetic induction heating device 22 ... metal body 22a ... first surface 22b ... second surface 23 ... current supply device 31 ... Coil 32, 33 ... 1st, 2nd winding conducting wire part 32a, 33a ... Curved part 32b, 33b ... Linear part 41 ... Coil 41a ... One end 42-44 ... 1st-3rd winding conducting wire part 51 ... Resin sheet 61 ~ 63 ... roll

Claims (11)

An electromagnetic induction heating coil for heating the metal body by electromagnetic induction while moving the metal body,
Having a length direction and a width direction,
Conductive wires are wound on two or more layers, and the first and second conductive wires are arranged side by side in the conductive wire stacking direction by winding the conductive wires on two or more layers. And
In one end of the length direction of the coil, it has a region in which the first winding wire portion and the second winding wire portion does not overlap each other,
Each of the first and second wound conductive wire portions includes a first straight portion in which the wound conductive wire extends linearly, a second straight portion in which the wound conductive wire extends linearly, and the first and it is continuous at one end to the linear portion that have a said curved portion are continuous the other end to the straight portion of the second electromagnetic induction heating coil.   The first winding wire portion and the second winding wire portion have the non-overlapping region by being shifted in the coil length direction at one end side in the coil length direction. The electromagnetic induction heating coil described in 1.   3. The electromagnetic induction according to claim 1, wherein the first winding conductor portion and the second winding conductor portion have a curved portion in which the wound conductor wire extends in a curved shape in the non-overlapping region. Heating coil.   4. The electromagnetic induction heating coil according to claim 3, wherein the first winding wire portion and the second winding wire portion have the curved portion in the entire non-overlapping region. 5. The electromagnetic induction heating coil according to any one of claims 2 to 4 , wherein the curved portion has an arc shape protruding outward in the length direction of the coil. Maximum distance deviation between the first winding wire portion in the length direction of the coil and the second winding wire portion is, 7 mm or more and 16mm or less, according to any one of claims 1 to 5 Electromagnetic induction heating coil. The electromagnetic induction heating coil according to any one of claims 1 to 6 , wherein the first winding wire portion and the second winding wire portion are formed of one and the same conducting wire. The electromagnetic induction heating coil according to any one of claims 1 to 7 ,
An electromagnetic induction heating device comprising: a current supply device for causing a current to flow through the electromagnetic induction heating coil. The electromagnetic induction heating coil according to any one of claims 1 to 7 , wherein the first winding wire portion and the second winding wire portion do not overlap each other on at least one surface of the metal body. Arrange the region to face the surface of the metal body,
A method of heating a metal body, wherein the metal body is moved by generating an eddy current by moving the metal body and passing a current through the electromagnetic induction heating coil. A direction orthogonal to the moving direction of the metal body, wherein as the length direction of the electromagnetic induction heating coil is substantially parallel, by arranging the electromagnetic induction heating coil, heating the metal body, according to claim 9 The heating method of the metal body as described in 2. The distance of the gap between the metal body and the electromagnetic induction heating coil is 0.74 times the maximum distance of deviation between the first winding wire portion and the second winding wire portion in the coil length direction. The method for heating a metal body according to claim 9 or 10 , wherein the metal body and the electromagnetic induction heating coil are arranged to heat the metal body as described above.

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