JP4074423B2 - Cylindrical or ring-shaped metal coil heating apparatus and heating method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention efficiently and continuously increases the productivity of a plurality of cylindrical metal coils, such as steel plates, aluminum plates, and copper plates, which are wound in a coil shape, wire rods, rods, etc. in a ring shape at the same time. The present invention relates to a continuous heating apparatus and heating method for a metal coil that can be heated.
[0002]
[Prior art]
Coiled metal is often placed in a batch furnace and heated by a gas or panel heater. In batch heating, the atmosphere can be controlled and annealing can be performed at a high temperature, and since annealing can be performed without mechanical distortion, it is possible to use special materials that cannot be heated by a continuous annealing device, those with strict quality, buckling, etc. Used for things that cannot be made.
[0003]
However, batch annealing of coils basically heats the metal lump from the outside, so the heating time becomes very long and the temperature deviation tends to be large. There are problems such as extremely low efficiency. In addition, in a loose coil such as a wire rod, the state of heat transfer is different between the overlapping portion and the non-overlapping portion of the coil, and the temperature distribution tends to occur, causing quality variations. Moreover, since it processes in batch, there exists a problem that productivity is low and it is difficult to process in large quantities.
[0004]
In order to solve these problems, it has been proposed to employ energization heating. For example, Japanese Patent Application Laid-Open No. 6-10067 describes energization from both ends of a coil, and Japanese Patent Application Laid-Open No. 5-171259 describes direct energization by an inner / outer electrode having an expansion / contraction mechanism. As a method of heating using electricity, Japanese Patent Application Laid-Open No. 61-19097 describes a method of induction heating through an iron core in a coil.
[0005]
[Problems to be solved by the invention]
However, in the method of energization heating, in the case of Japanese Patent Laid-Open No. 6-10067, there is a problem in that the contact surface between the coil and the electrode is difficult to hit uniformly, so that heat is generated locally and the coil is easily damaged. In the case of Japanese Patent Application Laid-Open No. 5-171259, a spark in a minute gap generated in the coil due to a difference in sheet thickness after rolling becomes a problem. Further, both of them are in the form of a lump, so there is a problem that the resistance is small, it is difficult to generate heat unless a large current is passed, and the heating rate is slow.
[0006]
In the case of Japanese Patent Application Laid-Open No. 61-19097, induction heating is effectively performed only in the portion up to the penetration depth corresponding to the frequency, and in other portions, heat is transferred by heat transfer, so the heating rate is increased. It is difficult to control the temperature distribution and the temperature distribution tends to be large. Furthermore, with these heating methods, it is difficult to process metal coils having different thicknesses, widths, types, and weights efficiently and quickly alone, and it is even more difficult to simultaneously process a plurality of metal coils.
[0007]
Accordingly, the present invention has an object to provide a highly productive heating apparatus and heating method capable of efficiently, uniformly and stably heating a plurality of cylindrical or ring-shaped metal coils having different sizes, types and weights. And
[0008]
[Means for Solving the Problems]
The gist of the present invention is as follows.
(1) A transformer is constructed by connecting an iron core that passes through the inside of a cylindrical or ring-shaped metal coil wound so as to insulate metal and an iron core wound with a primary coil outside the metal coil. In addition, a secondary closed circuit is constructed by short-circuiting the winding start and winding end portions of the metal coil with a conductive member, and the primary coil is energized to directly connect the secondary coil into the cylindrical or ring-shaped metal coil. In a heating device having a function of inducing current and heating the metal coil by the induced current, an iron core penetrating the inside of the plurality of vertically arranged metal coils and an iron core wound with a primary coil are made detachable. A cylindrical or phosphor having a mechanism for allowing the iron core penetrating the inside of the metal coil to move up and down in the metal coil axial direction and a mechanism for bringing the moving iron core into close contact with the fixed iron core Heating apparatus Jo metal coils.
(2) In the continuous heating apparatus of (1), a current breaker or an adjustment circuit for adjusting at least one of voltage, current, power, and phase is provided in the middle of the conductive member. Continuous heating device for cylindrical or ring-shaped metal coils.
[0009]
(3) An iron core that penetrates the inside of a cylindrical or ring-shaped metal coil wound with a metal having an insulating substance or film on the surface, and an iron core wound with a primary coil are placed outside the metal coil. Connected to form a transformer, and the winding start and end ends of the metal coil are short-circuited with a conductive member to form a secondary closed circuit, and the primary coil is energized to directly form the cylindrical or ring. In a heating method in which a secondary current is induced in a metal coil and the metal coil is heated by the induced current , the metal coil penetrates the inside of the metal coil according to the heating conditions of each of the plurality of metal coils placed vertically. Move the iron core in the axial direction of the metal coil to pay out the heated metal coil, or newly carry the metal coil to the position where the iron core penetrates and penetrate the iron core inside Of, by performing either or both, cylindrical or heating process of the ring-shaped metal coil, characterized by continuous energized heating.
(4) In the method for continuously heating a plurality of cylindrical or ring-shaped metal coils according to (3), the current is interrupted in the middle of the conductive member, or at least one of voltage, current, power, and phase is adjusted. And heating each metal coil, a continuous heating method for a cylindrical or ring-shaped metal coil.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a side view showing a cylindrical or ring-shaped metal coil heating device according to the present invention, and is an example in which four cylindrical or ring-shaped metal coils 1 to 4 are heated simultaneously. The principle of heating of the present invention uses a heating method by the inventors previously showed in Japanese Application flat No. 10-57345 (JP-A-11-236626). That is, by insulating each other, a secondary circuit is formed by short-circuiting the tip and tail ends of a cylindrical or ring-shaped metal coil, which is a secondary winding of a transformer, and voltage is applied to the primary coil. In this method, a secondary current is directly induced in a cylindrical or ring-shaped metal coil, and heating is performed by the induced current.
[0011]
As a method for insulating between coil layers, for example, in the case of a coil after hot rolling or a metal heat-treated in air, an insulating scale on the surface can be used, and the insulating property of the scale cannot be used. In some cases, a ceramic sheet such as alumina or a string may be sandwiched between coil layers. Alternatively, it may be wound with a gap like a spring, or an insulating coating agent may be sprayed. This invention provides the apparatus which can heat several to-be-heated material simultaneously and independently using this heating method.
[0012]
A U-shaped iron core 10 shown in FIG. 1 is wound with a primary coil 11 that can receive power from a primary power source 12. A detachable iron core 9 is connected to the iron core 10 from the left side of FIG. 1 to form a ring-shaped transformer. This detachable iron core 9 penetrates through the space part of the center part of the cylindrical or ring-shaped metal coils 1, 2, 3, 4 mounted on the coil bases 5, 6, 7, 8 and is cylindrical or ring-shaped metal coil. 1, 2, 3, and 4 are made to function as a secondary coil of a transformer.
[0013]
The iron core 9 and the iron core 10 can be attached to and detached from the rollers 15, 16, 17, 18, 19, 20, for example, by providing a horizontal movement mechanism, for example, a mechanism for moving the roller mount left and right with a hydraulic cylinder or the like. The iron core 9 and the iron core 10 can be attached and detached by moving the rollers 15, 16, 17, 18, 19, 20 horizontally in the horizontal direction while supporting the iron core 9 with 16, 17, 18, 19, and 20. Become.
When moving the iron core 9 up and down, the iron core 10 and the iron core 9 can be prevented from rubbing during vertical movement by separating the iron core 9 from the iron core 10 at one end.
[0014]
When the iron core 9 is penetrated to heat the cylindrical or ring-shaped metal coils 1, 2, 3, 4 or when the heating of the cylindrical or ring-shaped metal coils 1, 2, 3, 4 is finished, the iron core 9 is When pulling out, the iron core 9 can be realized by expanding and contracting the rod 13 of the hydraulic cylinder via the coupler 14.
In FIG. 1, a cylindrical or ring-shaped metal coil 1 'extracted on standby or after completion of heating is schematically shown on the left side of the drawing on an insertion / unloading device 21 for taking the coil in and out of a predetermined position. Indicates.
[0015]
FIG. 2 shows a front view of the AA cross section in FIG. The coil is taken in and out by placing cylindrical or ring-shaped metal coils 1 and 2 mounted on the coil bases 5 and 6 on receiving bases 24, 25, 26 and 27 for receiving the coil bases 5 and 6 provided on the gantry 22 and 23. What is necessary is just to insert / extract with the insertion / unloading apparatus 21 (illustrated on the left side of FIG. 1).
In this case, the coil bases 5 and 6 and the pedestals 22 and 23 are structured so as not to form a secondary one-turn circuit of the transformer, and the coil base is heated at a portion in contact with the cylindrical or ring-shaped metal coil. In order to prevent loss, it is desirable to use fireproof insulation. Furthermore, in order to prevent unnecessary magnetic coupling, it is desirable that the device is made of a non-magnetic material as much as possible, including bolts and nuts.
[0016]
In this example, the coil inserting / carrying-out device 21 is an image like a lifter, but it may be a rotating disk-like base. In the case of the example shown in FIG. 1, the cylindrical or ring-shaped metal coil is shown in an uncovered form for explanation, but actually, the outer surface is covered with a heat insulating material or the like, or is put in a heat-insulated container, It is desirable to perform heating with the atmosphere adjusted as necessary. Further, the rollers 15, 16, 17, 18, 19, and 20 preferably have a shape with a flange at the end as shown in FIG. 3 so that the iron core 9 does not tilt.
[0017]
As described above, if the cylindrical or ring-shaped metal coil can be detached from the iron core 9, the cylindrical or ring-shaped metal coil can be freely heated. That is, as shown in FIG. 4, the tip and tail ends of the cylindrical or ring-shaped metal coil 1 are short-circuited by the conductive member 28, and the conductive member 28 may be simply short-circuited between the ends, An adjustment circuit 29 for current on / off or voltage, current, phase, etc. may be provided to control the heating temperature, power factor and the like. The conductive member 28 and the adjustment circuit 29 are omitted in FIGS. 1 and 2 in order to avoid complication of the drawing.
[0018]
Thus, by providing the conductive member 28 with the current on / off or adjusting circuit 29 for voltage, current, phase, etc., the thickness, width and type of the cylindrical or ring-shaped metal coils 1, 2, 3, 4 are provided. Even if the heating temperature and the heating time are different from each other, the heating can be performed under necessary conditions, and the heating can be freely taken out from the finished one.
[0019]
The cylindrical or ring-shaped metal coil that has been heated can be taken out of the apparatus by turning off the power supply on the primary side and moving the iron core 9 downward. If a new material to be heated is set after removal, the supply of power temporarily stops for a short time as the coil is taken in and out, but the heating can be continued almost continuously.
[0020]
In this heating device, when the size, weight, and type of the cylindrical or ring-shaped metal coils 1, 2, 3, and 4 are substantially the same, the load on the secondary side is substantially the same. If the size and weight (number of turns) of the cylindrical or ring-shaped metal coils 1, 2, 3, and 4 change in the same way, a tap is provided on the primary coil side. By switching according to the load, efficient heating is possible.
[0021]
However, when the size, type, heating temperature, and the like of each metal coil are different, there is a limit to performing heating control of each metal coil on the primary side. Therefore, in order to control heating of individual metal coils, as shown in FIG. 4, a current breaker or an adjustment circuit 29 capable of adjusting voltage, current, power, etc. is provided in the middle of the conductive member 28 to be short-circuited. By providing the adjustment circuit 29, the temperature can be controlled even if the current is simply turned on / off on the load side, and the temperature can be finely controlled by controlling the voltage, current, power, and the like. .
[0022]
If control is possible on the metal coil side in this way, it becomes possible to control heating independently even if the size, weight, type, heating temperature, etc. of the metal coil are different, and heat processing a plurality of metal coils at once. Even in this case, since the heating temperature can be individually controlled, the degree of freedom of operation can be greatly increased, for example, by heating to a predetermined temperature and then maintaining the temperature at a constant temperature.
[0023]
【The invention's effect】
According to the present invention, it is possible to heat a metal coil as it is wound, and solve the problems of generation of a heating temperature distribution, which is an essential problem of batch heating, and extremely low productivity and heating efficiency. That is, since heating is performed from the inside of the metal coil by current, the heating time can be freely controlled, and since the temperature distribution and heating efficiency are extremely good, the heating quality is good and the yield drop can be reduced, greatly contributing to energy saving. In addition, since a plurality of coils having different types, sizes, and heating temperatures can be individually processed at the same time, productivity can be remarkably improved and the degree of freedom in production can be increased.
[0024]
Furthermore, because it can be processed semi-continuously, it does not require a long continuous heat treatment line, and can handle not only the size that cannot be processed by the continuous heat treatment line due to problems such as buckling, but also due to build-up that occurs on high temperature rollers Since there are no scratches, high quality heating is possible. In addition, the present invention is very advantageous in terms of cost because the equipment can be made extremely compact, and the heating efficiency is high and the power source capacity can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view showing a cylindrical or ring-shaped metal coil heating device according to the present invention.
FIG. 2 is a front view showing an AA cross section shown in FIG. 1;
FIG. 3 is a top view showing a roller used in the present invention.
FIG. 4 is a schematic cross-sectional view showing an example in which a regulator is provided on the secondary side of a cylindrical or ring-shaped metal coil according to the present invention.
[Explanation of symbols]
1-4: Cylindrical or ring-shaped metal coils 5-8: Coil bases 9, 10: Iron core 11: Primary coil 12: Primary power supply 13: Rod 14: Couplers 15-20: Roller 21: Insertion / unloading device 22, 23: Mount 24-27: Receiving base 28: Short-circuit wire 29: Adjuster

Claims (4)

An iron core that penetrates the inside of a metal coil that is wound to insulate the metal into a cylindrical or ring shape and an iron core that is wound with a primary coil are connected outside the metal coil to form a transformer, and A secondary closed circuit is constructed by short-circuiting the winding coil end and winding end with a conductive member, and a primary current is directly induced in the cylindrical or ring-shaped metal coil by energizing the primary coil. In the heating device having a function of heating the metal coil by the induced current, an iron core penetrating the inside of the plurality of metal coils placed vertically and an iron core wound with a primary coil can be freely attached and detached. A cylindrical or ring-shaped metal having a mechanism for allowing an iron core penetrating the inside of the coil to move up and down in the metal coil axial direction, and a mechanism for bringing the moving iron core into close contact with the fixed iron core Heater coil.   2. The cylindrical or ring-shaped metal coil heating device according to claim 1, wherein a current breaker or an adjustment circuit for adjusting at least one of voltage, current, power, and phase is provided in the middle of the conductive member. A heating device for a cylindrical or ring-shaped metal coil. An iron core that passes through the inside of a cylindrical or ring-shaped metal coil wound with a metal with an insulating material or film on the surface and an iron core wound with a primary coil are connected outside the metal coil. A cylindrical or ring-shaped metal coil is formed directly by forming a transformer and forming a secondary closed circuit by short-circuiting the winding start and winding end portions of the metal coil with a conductive member and energizing the primary coil. In the heating method in which a secondary current is induced in the inside and the metal coil is heated by the induced current, an iron core that penetrates the inside of the metal coil is made of metal according to the heating conditions of each of the plurality of metal coils placed vertically. Displace the metal coil that has been heated by moving it in the axial direction of the coil, or newly bring the metal coil to a position where the iron core penetrates, and penetrate the iron core inside the metal coil, By performing Zureka or both, cylindrical or heating process of the ring-shaped metal coil, characterized by continuous energized heating.  4. The continuous heating method for a plurality of cylindrical or ring-shaped metal coils according to claim 3, wherein current is interrupted in the middle of the conductive member, or at least one of voltage, current, power, and phase is adjusted to A continuous heating method for a cylindrical or ring-shaped metal coil, wherein the metal coil is heated.

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