WO2013100544A1 - 가열 장치 및 가열 방법 - Google Patents
가열 장치 및 가열 방법 Download PDFInfo
- Publication number
- WO2013100544A1 WO2013100544A1 PCT/KR2012/011440 KR2012011440W WO2013100544A1 WO 2013100544 A1 WO2013100544 A1 WO 2013100544A1 KR 2012011440 W KR2012011440 W KR 2012011440W WO 2013100544 A1 WO2013100544 A1 WO 2013100544A1
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- WIPO (PCT)
- Prior art keywords
- metal plate
- heating
- winding coil
- iron core
- magnetic iron
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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
- H05B6/365—Coil arrangements using supplementary conductive or ferromagnetic pieces
-
- 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
-
- 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
-
- 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
-
- 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
- H05B6/362—Coil arrangements with flat coil conductors
-
- 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
- H05B6/40—Establishing desired heat distribution, e.g. to heat particular parts of workpieces
-
- 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
- H05B6/42—Cooling of coils
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
- C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
-
- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/60—Continuous furnaces for strip or wire with induction heating
-
- 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 heating apparatus and a heating method, and more particularly, to a heating apparatus and a heating method capable of overheating an edge portion as a heating apparatus for heating a metal plate continuously supplied, and capable of uniform heating at portions except the edge portion.
- Transverse Flux Induction Coils are one of the induction heating technologies developed from the Longitudinal Flux Induction Coils (LFICs).
- 1 illustrates the principle of heating a metal plate by LFIC and TFIC.
- the magnetic field generated by the LFIC acts laterally on the metal plate, thereby generating an eddy current in the vertical cross section of the metal plate.
- the permeability is inherent to the properties of the metal, which cannot be controlled, and the high operating frequency is limited in the implementation of large-capacity power equipment. Therefore, there is a limit to the induction heating of the non-magnetic metal sheet by the LFIC.
- the initial TFIC as shown in Figure 3, took the form of a simple rectangular winding, but the energy delivered to the steel sheet is uneven in the width direction, in particular, the energy is reduced by about 20% compared to the center inside the edge portion 20 is insufficient.
- a heating section occurred (see C of FIG. 3b).
- both ends of the TFIC have a head in a circular shape, and in particular, reduce the cross-sectional size of the head part 10, or make a large outward shape to increase the current density of the insufficient heating part, or the current path.
- the extension was made to compensate for insufficient heating inside the edge portion, thereby enabling widthwise uniform heating.
- the position of the TFIC head 10 must be accurately controlled. In other words, there was an optimal position of the TFIC for the metal plate for the widthwise uniform heating according to the width change or meandering of the metal plate, and the movement of the TFIC is inevitable.
- a U-shaped TFIC was developed by dividing the upper and lower pairs of heating coils into two pairs as shown in FIG. 4 to control the position of the coil.
- An induction heating system using two pairs of TFICs requires two power supplies and matching configurations (capacitors, transformers, etc.), and a mechanical part is necessary because coil position control is necessary in accordance with the width change and meandering of the metal plate.
- the cross section or shape of the heating coil is changed in the head portion, it is unavoidable to manufacture the coil by welding, which may cause perforation due to overheating in the weld portion, and thus leakage of the coil cooling water. In other words, the production of the coil is difficult, the system is complicated, the initial investment costs are high.
- the present invention is to solve the problems of the prior art as described above, it is an object of the present invention to provide a heating device that is simple in the form of a coil and capable of overheating and uniform heating in the width direction of the edge of the metal plate.
- an object of the present invention is to provide a heating device which is simple in construction and capable of overheating of the edge portion and uniform heating in the width direction without the need for a coil position control mechanism.
- an object of the present invention is to provide a heating apparatus and a heating method capable of overheating the edge portion and uniformly heating in the width direction even when meandering occurs.
- the present invention provides the following heating apparatus and heating method in order to achieve the above object.
- the present invention is provided spaced apart from one surface of the metal plate to generate a magnetic field for heating the metal plate, provided in parallel to the metal plate, and extends in the direction of travel of the metal plate and a pair of horizontal portions extending in the width direction of the metal plate.
- a first heating portion comprising a winding coil having a pair of longitudinal portions and spaced apart from the other surface of the metal plate, provided in parallel with the metal plate, and extending in a traveling direction of the pair of horizontal portions and the metal plate extending in the width direction of the metal plate;
- a second heating portion including a winding coil having a pair of longitudinal portions, wherein the first and second heating portions include magnetic iron cores extending along a pair of horizontal portions of the winding coils.
- a first member extending along the inner side of the horizontal portion, wherein the outer side of the horizontal portion in the winding coil is opened. do.
- the winding coil is wound in a rectangular shape having a long length in the width direction of the metal plate
- the magnetic iron core may include a front magnetic iron in the front of the metal plate advance direction, and a rear magnetic iron in the rear of the metal plate advance direction.
- the magnetic iron core may further include a second member positioned on an opposite surface of the metal plate of the winding coil.
- the second member of the magnetic iron core may include an extension part longer in the metal plate width direction than the first member, the extension part may extend to the metal plate width direction end portion of the winding coil.
- the apparatus may further include a magnetic shielding box including the winding coil and the magnetic iron core therein and provided to prevent leakage of the magnetic field by the winding coil.
- the magnetic iron core may be a compression-sintered powder type high permeability material having a relative permeability of 1000 or more, or a laminate of electrical steel sheets having a relative permeability of 1000 or more in the longitudinal direction.
- an insulating plate may be disposed between the magnetic iron core and the winding coil, and a heat sink may be disposed outside the magnetic iron core, and the heat sink may have a shape corresponding to the magnetic iron core and a water-cooled coil disposed on the outside thereof. Can be.
- the winding coil and the magnetic iron core therein further comprising a magnetic field shielding box provided to prevent leakage of the magnetic field by the winding coil, wherein the winding coil, insulation plate, magnetic iron core, and heat sink is the magnetic field shielding
- the base plate inside the box can be fixed through the coupling means.
- the magnetic iron core is a compression-sintered powder-type high permeability material having a relative permeability of 1000 or more, the diameter of the high permeability material may be less than the magnetic field penetration depth.
- the magnetic iron core is a laminate of electrical steel sheets having a relative magnetic permeability of 1000 or more in the longitudinal direction, and the thickness of the electrical steel sheets may be equal to or less than the magnetic field penetration depth.
- the magnetic iron core is laminated to the electrical steel sheet to the adhesive layer, it is preferable that the volume ratio of the electrical steel sheet to the total volume in the magnetic iron core 95% or more to implement the widthwise uniform heating pattern of the metal plate.
- the length of the winding coil inner long side may be greater than 80% and less than 120% of the width direction of the metal plate.
- the magnetic shielding box is configured to exceed the magnetic field penetration depth, the distance between the winding coil and the inner surface of the magnetic shielding box than the distance between the winding coil and the metal plate in order to reduce the induced current loss of the magnetic shielding box. It is preferable to go further.
- the present invention is the heating device described above; It provides a rolling line comprising a; rolling mill disposed at the rear end of the heating device.
- the present invention provides a heating method for heating a metal plate continuously supplied to a heating device disposed on both sides of a metal plate, the supplying step of supplying a metal plate to the heating device; And a heating step of heating the supplied metal plate by generating a magnetic field perpendicular to the metal plate with the winding coil of the heating device, wherein the heating step controls the intensity of the magnetic field generated in the winding coil through a magnetic iron core.
- a heating method is provided in which the edge portion of the metal plate is overheated than the center portion, and the center portion of the metal plate is heated so that the widthwise temperature distribution is uniform.
- the present invention may be carried out before the rolling idle so that the metal plate heated in the heating step is supplied to the rolling process, which overheats the edge portion before the rolling process because the cooling of the edge portion in the rolling process occurs a lot
- the present invention can provide a heating device that is simple in the form of a coil through the above configuration, but also capable of overheating and uniform heating in the width direction of the edge of the metal plate.
- the present invention can provide a heating apparatus and a heating method which is simple in construction, capable of overheating the edge portion and uniformly heating in the width direction without the need for a coil position control mechanism, and providing the same performance even when meandering occurs. have.
- 1 is a diagram illustrating a conventional LFIC.
- FIG. 2 is a diagram illustrating a conventional TFIC.
- FIG. 3 is a diagram illustrating an example of a conventional TFIC
- FIG. 3A is a plan view of a coil and a metal plate
- FIG. 3B is a power distribution graph of the metal plate heated by the TFIC of FIG. 3A.
- FIG. 4 is a view showing another example of the conventional TFIC
- Figure 4a is a plan view of the coil and the metal plate
- Figure 4b is a power distribution graph of the metal plate heated by the TFIC of Figure 4a.
- FIG. 5A is a diagram illustrating an eddy current density distribution when heated by the TFIC of FIG. 3, and FIG. 5B is a diagram illustrating an eddy current path induced in the metal plate of FIG. 5A.
- FIG. 6 is a perspective view of a transverse flux induction heater according to the invention.
- FIG. 7 is a perspective view and a plan view of the winding coil in the heating section of the transverse flux induction heater according to the invention.
- FIG. 8 is a perspective view (FIG. 8 a), a side view (FIG. 8 b), a front view (FIG. 8 c) and a top view (FIG. 8 d) of a magnetic iron core in a heating section of a transverse flux induction heater according to the invention.
- FIG. 9 is a view of a heating unit according to the present invention
- Figure 9a is an assembly view of the heating unit
- Figure 9b is an assembly cross-sectional view of the heating unit.
- FIG 10 is a view showing the positions of the magnetic iron cores of the comparative example and the first embodiment.
- FIG. 11 is a graph of power distribution according to the magnetic core position of FIG. 10.
- FIG. 12 is a view showing the positions of the magnetic iron cores of the first to third embodiments.
- FIG. 13 is a graph of power distribution according to the magnetic core position of FIG. 12.
- FIG. 14 is a graph comparing power distribution of the third embodiment of FIG. 12 and the related art.
- 15A is a plan view of the heating apparatus of the present invention.
- 15B is a power distribution graph according to the change of the length of the magnetic iron core of the heating apparatus of the present invention.
- FIG. 16 is a cross-sectional view of the heating apparatus of the present invention.
- 17 is a graph of power distribution according to meandering of a metal plate.
- FIG. 19 is a schematic view in which the heating apparatus of the present invention is arranged on a rolling line.
- FIG. 5A is a diagram showing an eddy current density distribution when heated by the TFIC of FIG. 3, and FIG. 5B is a diagram showing an eddy current path induced in the metal plate of FIG. 5A.
- FIG. 5 when the TFIC of FIG. 3 is used, it can be seen that eddy currents are concentrated in the edge portion E. FIG. This is due to an end effect in which the eddy current density becomes high due to magnetic field distortion and concentration at the edge portion E.
- FIG. 5A is a diagram showing an eddy current density distribution when heated by the TFIC of FIG. 3
- FIG. 5B is a diagram showing an eddy current path induced in the metal plate of FIG. 5A.
- the inventor of the present invention concentrated a current path divided by introducing a magnetic iron core in order to concentrate the current to the edge portion E in the heating coil into the heating coil.
- the transverse flux induction heater (1) of the present invention is the upper heating portion 100 disposed on the upper surface of the metal plate (P) and the lower heating disposed on the lower surface of the metal plate (P)
- the unit 200 is included.
- the upper heating unit 100 is a magnetic field shielding box 101 to prevent external leakage of the magnetic field generated by the winding coil, the winding coil 110 is disposed therein and generates a magnetic field perpendicular to the horizontal plane of the metal plate and the
- the magnetic coil cores 120 and 130 cover a portion of the inner surface and the upper surface of the winding coil 110 and control magnetic flux density for each position of the magnetic field generated in the winding coil 110.
- the magnetic iron core 120, 130 is located on the upper and inner surfaces of the horizontal portion.
- the lower heating unit 200 includes a magnetic shield box 201, a winding coil 210 disposed therein, and magnetic iron cores 220 and 230 that cover portions of inner and lower surfaces of the winding coil 210. It is configured to include.
- FIG. 7 shows a perspective view and a plan view of the winding coil 110 in the upper heating part 100 of the transverse flux induction heater 1 according to the invention.
- the winding coil 110 uses copper having excellent thermal conductivity and electrical conductivity, and is disposed spaced apart from the predetermined distance in the thickness direction of the metal plate moving in the lateral direction.
- the winding coil 110 may vary depending on the design, but in the present embodiment, the coil having a rectangular cross section has a rectangular shape having a long length in the width direction of the metal plate, and the outer winding part 111, the central winding part 112, and the inner winding.
- Part 113 has three windings.
- the long length a of the winding coil 110 is the width direction of the metal plate, that is, the horizontal portion, and the short length b is the travel direction of the metal plate, that is, the vertical portion.
- the inner winding 113 is provided with connecting portions 114 and 115 connected to the power supply.
- the distance between the metal plate (P) and the winding coil 110 is such that the winding coil 110 can avoid collision even in the vertical deformation of the metal plate (P), but the electromagnetic coupling of the winding coil 110 and the metal plate (P) It is desirable to be as narrow as possible so that the electromagnetic coupling is strong.
- the distance between the upper winding coil 110 and the lower winding coil 210 is approximately 80 mm, so that it is preferable to secure the impact and electromagnetic coupling effect. Therefore, it can be changed.
- FIG. 8A shows a perspective view of the magnetic cores 120, 130 at the upper heating part 100 of the transverse flux induction heater 1 according to the invention
- FIG. 8B is a side view of the magnetic core 120
- FIG. 8c shows a front view of the magnetic iron core 120
- FIG. 8d shows a top view of the magnetic iron core 120.
- the magnetic iron cores 120 and 130 are formed of the front magnetic core 130 and the rear magnetic core 120 along the traveling direction of the metal plate P, and the front and rear magnetic cores ( 120 and 130 may have the same shape, but the length of the vertical part 121 may be partially changed by the connection part 115.
- the front magnetic core 130 and the rear magnetic core 120 are disposed to be spaced apart from each other to face the vertical portion 121 on the inner surface of the winding coil 110, the thickness of the magnetic core (120, 130) and the winding coil 110 As the short length b (see FIG. 7) is changed, it may be composed of a single magnetic iron core 120 and 130.
- the rear magnetic core 120 includes a vertical portion (first member) 121 covering an inner surface of the winding coil 110 and a horizontal portion (second member; 122) covering an upper surface. As in the side view, it has an approximately '-' shape.
- the horizontal part 122 includes a central part 122b corresponding to the vertical part 121 and extension parts 122a and 122c extending to both ends of the winding coil 110. Since the vertical part 121 covers the inner side surface of the winding coil 110, it may not be provided at a position corresponding to the extending portions 122a and 122c. In the present invention, the outer side surface of the horizontal portion of the winding coil 110 may not be provided. Since the magnetic iron cores 120 and 130 are not arranged, the outer side of the horizontal portion of the winding coil 110 is opened.
- the adhesive layer 124 may be disposed between the electrical steel sheets 123.
- the thickness of the electrical steel sheet 123 is preferably less than the penetration depth of the magnetic field induced by the winding coil 110 because it can reduce the magnetic iron loss.
- the penetration depth of the magnetic iron cores 120 and 130 is approximately 0.37 mm at an operating frequency of 1000 Hz, the thickness of the electrical steel sheet 123 is preferably smaller than this.
- the magnetic iron core may be implemented by compression sintering a material having a relative permeability of 1000 or higher or a high permeability, and in the case of compression sintering such a high permeability material, the diameter of the material is less than the magnetic field penetration depth to reduce the magnetic iron loss. It is preferable because it can be made. For example, since the penetration depth is approximately 0.37 mm at an operating frequency of 1000 Hz, the diameter of the high permeability material is preferably smaller than this.
- the electrical steel sheet 123 when the electrical steel sheet 123 is laminated through the adhesive layer 124, the electrical steel sheet 123 may be laminated so that the volume of the electrical steel sheet 123 is 95% or more. This is because when the adhesive layer 124 exceeds 5%, the performance of the magnetic iron core 120 may be degraded and the width direction pattern of the metal plate P may be changed.
- FIG. 9 is a view in which the magnetic iron cores 120 and 130 and the winding coil 110 are fixed inside the magnetic shielding box 101.
- a perspective view is shown in FIG. 9A and a cross-sectional view is shown in FIG. 9B.
- magnetic iron cores 120 and 130 and a winding coil 110 are mounted on a base 190 connected to the magnetic field shielding box 101.
- an insulating plate 140 is provided between the winding coil 110 and the magnetic cores 120 and 130 to insulate the winding cores 110 and the magnetic cores 120 and 130 while simultaneously insulating the magnetic cores 120 and 130.
- the heat sink 150 is disposed on the magnetic iron cores 120 and 130 to surround the magnetic iron cores 120 and 130.
- the insulating plate 140 and the heat sink 150 are provided of a material having high thermal conductivity.
- a water-cooled coil 180 is disposed on the heat sink 150 to extract heat from the magnetic iron cores 120 and 130 due to the magnetic field generated by the winding coil 110 to the outside.
- a space for arranging the water-cooled coil 180 is secured between the heat sink 150 and the base 190, and a bush 160 having a predetermined thickness is inserted to space the base 190 and the heat sink 150 by a predetermined distance.
- the bush 160 passes through the magnetic iron cores 120 and 130, the insulation plate 140, and the heat sink 150, and is connected to the winding coil 110.
- the bush 160 and the base 190 are in contact with each other, and a bolt 170 as a coupling means penetrating the base 190 is fastened to the bush 160 so that the winding coil 110, the insulating plate 140, The heat sink 150 and the magnetic iron cores 120 and 130 are fixed to the base 190.
- the winding coil 110, the insulation plate 140, the heat sink 150, and the magnetic iron cores 120 and 130 fixed to the base 190 are connected to the magnetic field shield box 101 by the base 190. 101 can be fixed within the position.
- FIG. 10 shows a first embodiment of the present invention and a comparative example
- FIG. 11 shows a graph of power distribution according to the distance from the center of the metal plate of the first embodiment and the comparative example obtained through numerical analysis.
- the first embodiment (III) of the present invention is implemented by only the vertical portion 121 in which the magnetic iron core 120 is located on the inner surface of the winding coil 110, whereas in the case of the comparative example (I) In the magnetic iron core 120 is located on the outer surface of the winding coil 110 is implemented by only the vertical portion 125 to cover the outer surface of the winding coil 110, in the case of another Comparative Example (II) magnetic iron core 120 ) Is implemented with only the horizontal portion 122 covering the upper surface of the winding coil (110).
- the number of windings, pole pitch, spacing, etc. of the winding coil 110 are all the same, and through numerical analysis, a value obtained by integrating both Joule heat in the traveling direction and the thickness direction of the steel sheet at each point in the width direction. That is, the final heating pattern obtained after the steel sheet passes through TFIC is shown in FIG.
- the magnetic iron core 120 of the present invention has been modified to cover two or more surfaces in a state including a vertical surface 121 covering an inner surface thereof, and thus further embodiments and distances from the center of the metal plate thereof.
- a graph of power distribution according to is shown.
- the vertical part 121 of the magnetic iron core 120 covers only the inner side surface of the winding coil 110 as in FIG. 10.
- the magnetic iron core 120 of the second embodiment (IV) of the interruption includes a vertical portion 121 covering the inner surface and a horizontal portion 122 covering the upper surface with a width corresponding thereto. It has a shape, and the outer surface of the winding coil 110 and the surface toward the metal plate is opened.
- the magnetic iron core 120 of the third embodiment (V) at the bottom is a vertical portion 121 covering the inner surface and a horizontal portion 122 covering the upper surface with a width corresponding thereto, as in the second embodiment (IV).
- Including but the horizontal portion 122 has a shape extending to the widthwise end of the winding coil 110, as described in detail in FIG.
- the outer surface of the winding coil 110 and the surface facing the metal plate are opened.
- FIG. 13 is a power distribution graph showing the heating patterns of the first to third embodiments (III to V) of FIG. 12, all of the first to third embodiments (III to V) are inadequate adjacent edge portions of the metal plate. It can be seen that the heating section is compensated.
- the second embodiment (IV) shows an improved heating pattern than the first embodiment (III).
- the third embodiment (V) shows an improved heating pattern than the second embodiment (IV).
- FIG. 14 is a power distribution graph showing a widthwise heating pattern of a U-shaped TFIC divided into two pairs of upper and lower pairs of heating coils as shown in the third embodiment (V) and FIG. 4.
- the widthwise heating pattern fluctuates, but it can be seen that the third embodiment (V) of the present invention has a stable heating pattern. .
- the induction heating system using two pairs of TFIC as shown in Figure 4 requires two power supplies and matching configuration (capacitor, transformer, etc.), and the coil position control according to the width change and meandering of the metal plate is essential, although necessary, the embodiment of the present invention is not sensitive to meandering. This will be described later in detail with FIGS. 16 to 17.
- 15A and 15B show heating patterns according to the relationship between the width of the metal plate P and the widthwise lengths of the magnetic iron cores 120 and 130 of the present invention.
- 15A shows a plan view of the heating unit 100 of the present invention.
- the winding coil 110 is wound three times including the outer winding part 111, the central winding part 112, and the inner winding part 113, and is located on the inner side and the upper side of the winding coil 110.
- the magnetic iron core 130 and the rear magnetic iron core 120 are disposed.
- the magnetic cores 120 and 130 of FIG. 15A include the vertical portion 121 and the horizontal portion 122 in the same manner as the magnetic cores 120 and 130 of FIG. 8, and the horizontal portion 122 includes the extension portions 122a, 122c), the length of the magnetic iron core (120, 130) means the common length of the horizontal portion 122 and the vertical portion 121, that is, the length (L) of the vertical portion of the magnetic iron core 130 , Means a short length in the inner winding portion 113 of the winding coil 110.
- FIG. 15B a heating pattern according to the change in the length L of the vertical part is illustrated in FIG. 15A.
- the width of the metal plate P is 1000 mm
- overheating of the edge portion does not occur when the length L of the magnetic iron core 130 is 80% of the metal plate P and 800 mm.
- the width of the metal plate P is 1000 mm
- the dissipation heating section is increased when the length L of the magnetic iron core 130 is 120% of the metal plate P and 1200 mm. Therefore, the length L of the magnetic iron cores 120 and 130 is greater than 80% and 120% or less with respect to the width of the metal plate P.
- the heating pattern for heating the edge portion of the metal plate P uniformly while heating the other part is uniform.
- the distance d2 between the magnetic field shield box 101 and the winding coil 110 is preferably larger than the distance d1 between the winding coil 110 and the metal plate P. This is to minimize the induced current loss of the magnetic shield box 101.
- the magnetic shielding box 101 is preferably composed of a metal plate so that the magnetic shielding effect by the induced current can be expected, in the present embodiment, copper is used for the magnetic shielding box 101, but is not limited thereto.
- the thickness of the magnetic field shielding box 101 is preferably greater than the penetration depth of the material by frequency.
- the thickness of the magnetic field shield box 101 is preferably configured to exceed 2 mm.
- FIG. 16 is a cross-sectional view illustrating a case where meandering of the metal plate P occurs in the heating apparatus of the present invention
- FIG. 17 is a graph illustrating a power distribution according to a meandering distance in FIG. 16, that is, a heating pattern.
- the metal plate P is also passed between the winding coils 110 and 210 in a state where the heating units 100 and 200 of the present invention are disposed above and below the metal plate P. have.
- the center of the metal plate (P) proceeds to coincide with the center of the winding coils (110, 210), but meandering (Off-Centering) occurs in the actual situation, the heating pattern is not maintained even when the meandering occurs. If not, the mechanism should be provided so that the heating device corresponds to the meandering.
- the meandering distance OC means a horizontal distance between the center of the winding coils 110 and 210 and the center of the metal plate P.
- FIG. 17A to 17B show power distribution graphs according to distances showing heating patterns when the meandering distances OC are 30 mm and 40 mm.
- the heating unit 100, 200 according to the present invention can be confirmed that even if a meander occurs, overheating occurs at the edge portion, and uniform heating is possible at the center portion. That is, it can be seen that the heating pattern has an approximately 'U' shape.
- FIG. 18 shows a performance evaluation graph of the transverse flux induction heater in which the embodiment of FIG. 6 is actually manufactured and installed.
- the length L of the magnetic iron cores 120 and 130 is a length corresponding to the width of the metal plate P.
- the power capacity is 100 kW
- the operating frequency is 1100.
- the metal plate passed through was a stainless steel sheet (conductivity: 1.1 ⁇ 10 6 S / m).
- FIG. 19 shows a state in which the heating apparatus of the present invention is arranged in a rolling line.
- the heating apparatus of the present invention heats the strips through which the upper heating part 100 and the lower heating part 200 pass on the upper side and the lower side of the strip as the metal plate, and the heated strips are subjected to the rolling mill 7.
- the horizontal portion and the vertical portion mean the winding coils formed in the width direction and the advancing direction of the metal plate, and are not limited to straight lines but may be formed in a curved line.
- the magnetic core covering one side is configured to be connected to each other to the magnetic core covering the other side, but is not limited thereto. It can also be produced.
- the heating device of the present invention is not limited to a thin plate heating device, and it is also possible to heat a thick metal plate by changing the number of windings, the winding shape and the frequency of the winding coil according to the thickness of the metal plate.
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- Crystallography & Structural Chemistry (AREA)
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- General Induction Heating (AREA)
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Abstract
Description
Claims (18)
- 금속판을 가열하는 자기장을 발생시키도록 금속판의 일면에 이격하여 설치되며, 상기 금속판에 평행하게 제공되며, 금속판의 폭방향으로 연장되는 한 쌍의 가로부 및 금속판의 진행 방향으로 연장되는 한 쌍의 세로부를 구비하는 권선 코일을 포함하는 제 1 가열부 및금속판의 타면에 이격하며, 상기 금속판에 평행하게 제공되며, 금속판의 폭방향으로 연장되는 한 쌍의 가로부 및 금속판의 진행 방향으로 연장되는 한 쌍의 세로부를 구비하는 권선 코일을 포함하는 제 2 가열부를 포함하며,상기 제 1 및 제 2 가열부는 상기 권선 코일의 한 쌍의 가로부를 따라 연장되는 자기 철심을 포함하며,상기 자기 철심은 상기 가로부의 내측면을 따라서 연장되는 제 1 부재를 구비하며, 상기 권선 코일에서 가로부의 외측면은 개방되는 가열 장치.
- 제 1 항에 있어서,상기 자기 철심은 금속판 진행방향 전방의 전방 자기 철심과, 금속판 진행 방향 후방의 후방 자기 철심을 포함하는 것을 특징으로 하는 가열 장치.
- 제 1 항에 있어서,상기 자기 철심은 상기 권선 코일의 금속판 반대면에 위치하는 제 2 부재를 더 포함하는 것을 특징으로 하는 가열 장치.
- 제 3 항에 있어서,상기 자기 철심의 제 2 부재는 상기 제 1 부재보다 금속판 폭방향으로 길이가 길도록 연장부를 포함하는 것을 특징으로 하는 가열 장치.
- 제 4 항에 있어서,상기 연장부는 상기 권선 코일의 금속판 폭방향 단부까지 연장된 것을 특징으로 하는 가열 장치.
- 제 1 항에 있어서,상기 권선 코일 및 상기 자기 철심을 내부에 포함하며, 상기 권선 코일에 의한 자기장의 누출을 막도록 제공된 자기장 차폐 박스를 더 포함하는 것을 특징으로 하는 가열 장치.
- 제 1 항에 있어서,철손을 최소화 하도록 상기 자기 철심은 상대 투자율이 1000 이상인 파우더형 고투자율 재료를 압축 소결하거나, 상대 투자율이 1000 이상인 전기 강판을 길이 방향으로 적층하여 형성되는 것을 특징으로 하는 가열 장치.
- 제 1 항에 있어서,상기 자기 철심과 상기 권선 코일 사이에는 절연판이 배치되며, 상기 자기 철심 외측에는 방열판이 배치되는 것을 특징으로 하는 가열 장치.
- 제 8 항에 있어서,상기 방열판은 상기 자기 철심에 대응되는 형상을 가지며 외측에 수냉식 코일이 배치되는 수냉식 방열판인 것을 특징으로 하는 가열 장치.
- 제 9 항에 있어서,상기 권선 코일 및 상기 자기 철심을 내부에 포함하며, 상기 권선 코일에 의한 자기장의 누출을 막도록 제공된 자기장 차폐 박스를 더 포함하며,상기 권선 코일, 절연판, 자기 철심, 및 방열판은 상기 자기장 차폐 박스 내부의 베이스에 결합수단을 통하여 고정되는 것을 특징으로 하는 가열 장치.
- 제 7 항에 있어서,상기 자기 철심은 상대 투자율이 1000 이상인 파우더형 고투자율 재료를 압축 소결한 것으로, 상기 고투자율 재료의 직경은 자기장 침투 깊이 이하인 것을 특징으로 하는 가열 장치.
- 제 7 항에 있어서,상기 자기 철심은 상대 투자율이 1000 이상인 전기 강판을 길이 방향으로 적층한 것이며, 상기 전기 강판의 두께는 자기장 침투 깊이 이하인 것을 특징으로 하는 가열 장치.
- 제 12 항에 있어서,상기 자기 철심은 상기 전기 강판을 길이 방향을 따라서 접착층으로 적층시키며, 상기 금속판의 폭방향 균일 가열 패턴을 구현하도록 상기 자기 철심에서 전체 부피 대비 상기 전기 강판의 부피 비율이 95% 이상인 것을 특징으로 하는 가열 장치.
- 제 2 항에 있어서,상기 권취 코일 내측 장변에 배치되는 상기 자기 철심의 길이는 금속판의 폭방향 길이의 80% 초과 120% 이하인 것을 특징으로 하는 가열 장치.
- 제 6 항에 있어서,상기 자기장 차폐 박스는 자기장 침투 깊이를 초과하여 구성되며,상기 자기장 차폐 박스의 유도 전류 손실을 줄이기 위하여 상기 권취 코일과 상기 금속판과의 거리보다 상기 권취 코일과 상기 자기장 차폐 박스의 내면의 거리가 더 먼 것을 특징으로 하는 가열 장치.
- 제 1 항의 가열 장치;상기 가열 장치의 후단에 배치되는 압연기;를 포함하며, 상기 가열 장치에 의해서 가열된 금속 스트립을 압연기로 압연하는 압연 라인.
- 금속판의 양면으로 배치되는 가열 장치로 연속적으로 공급되는 금속판을 가열하는 가열 방법으로,상기 가열 장치로 금속판을 공급하는 공급단계; 및상기 가열 장치의 권선 코일로 금속판에 수직인 자기장을 발생시켜 공급되는 금속판을 가열하는 가열단계;를 포함하며,상기 가열단계는 상기 권선 코일에서 발생하는 자기장의 세기를 자기 철심을 통하여 조절하여 상기 금속판의 에지부를 중앙부보다 과열시키며, 금속판의 중앙부는 폭방향 온도 분포가 균일하도록 가열시키는 가열 방법.
- 제 17 항에 있어서,상기 가열 단계에서 가열된 금속판이 압연 공정으로 공급되도록 상기 가열 단계는 압연 공전 이전에 수행되는 것을 특징으로 하는 가열 방법.
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EP12861757.8A EP2800452B1 (en) | 2011-12-28 | 2012-12-26 | Heating apparatus and heating method |
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CN109971928A (zh) * | 2019-04-16 | 2019-07-05 | 北京科技大学 | 一种板坯感应加热装置 |
CN113141687A (zh) * | 2021-03-29 | 2021-07-20 | 首钢京唐钢铁联合有限责任公司 | 一种板坯感应加热装置及系统 |
CN117336909A (zh) * | 2023-11-30 | 2024-01-02 | 华中科技大学 | 提高连铸连轧板坯加热均匀性和加热效率的装置和方法 |
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CN117336909A (zh) * | 2023-11-30 | 2024-01-02 | 华中科技大学 | 提高连铸连轧板坯加热均匀性和加热效率的装置和方法 |
CN117336909B (zh) * | 2023-11-30 | 2024-02-09 | 华中科技大学 | 提高连铸连轧板坯加热均匀性和加热效率的装置和方法 |
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KR101294918B1 (ko) | 2013-08-08 |
JP2015510544A (ja) | 2015-04-09 |
CN104025705A (zh) | 2014-09-03 |
EP2800452A4 (en) | 2015-07-29 |
EP2800452B1 (en) | 2016-07-13 |
CN104025705B (zh) | 2016-02-24 |
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