JP2000331775A - Continuous heating arrangement for cylindrical or annular metal coil and heating method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heat plural metal coils formed into a cylindrical shape or an annular shape by winding a metal having an insulating substance or coating continuously, efficiently, uniformly and in a short time. SOLUTION: A transformer is formed by linking an iron core 1 penetrating through the inside of a metal coil 15 to an iron core 2 wound by a primary coil 3 outside the metal coil 15, a secondary closing circuit is also formed by short-circuiting the end parts of the metal coil 15 at the start and the finish of its winding by a conductive member, and the metal coil 15 is heated by energizing the primary coil 3. The iron core 1 penetrating through the inside of the metal coil is made detachable from the iron core 2 wound by the primary winding 3, and rollers 5-10 to place the iron core 1, while making it movable in the axial direction of the metal coil and a carriage device to carry the metal coil 15 to the position, where the iron core 1 penetrates through it and to sweep it out after heating is completed are provided. The metal coil 15 is carried in and out by moving the iron core 1 in the axial direction of the metal coil by the roller 5-10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a steel plate or an aluminum plate,
A continuous heating device for a metal coil capable of efficiently and continuously heating a cylindrical metal coil wound in a coil shape such as a copper plate, or a ring-shaped metal coil in which a wire or a rod is wound in a ring shape, simultaneously increasing productivity and efficiently; It relates to a heating method.

[0002]

2. Description of the Related Art Conventionally, coiled metal is often placed in a batch furnace and heated by a gas or panel heater. Batch heating can control the atmosphere, can be annealed to a high temperature, and can be annealed without applying mechanical strain.Therefore, it can be used for special materials that cannot be heated by continuous annealing equipment, those with severe quality, buckling, etc. It is used for things that cannot be boarded.

[0003] However, the batch annealing of the coil basically heats the metal lump from the outside, so that the heating time becomes extremely long and the temperature deviation tends to be large. In addition, there is a problem that the heating efficiency is extremely low. Further, 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 is likely to be formed, which causes quality variation. In addition, there is a problem in that productivity is low and processing in large quantities is difficult due to batch processing.

In order to solve these problems, it has been proposed to employ electric heating. For example, Japanese Unexamined Patent Publication
Japanese Patent Application Laid-Open No. 10067 describes that current is supplied from both ends of the coil, and Japanese Patent Application Laid-Open No. 5-171259 describes that current is supplied directly to inner and outer electrodes having an expansion / contraction mechanism. As a method of heating using electricity, Japanese Patent Application Laid-Open No. 61-19097 describes a method of passing an iron core through a coil and performing induction heating.

[0005]

However, in the method of energizing and heating, in the case of Japanese Patent Application Laid-Open No. 6-10067, the contact surface between the coil and the electrode is difficult to evenly contact, so that heat is locally generated and the coil is easily damaged. There is a problem. In the case of Japanese Patent Application Laid-Open No. Hei 5-171259, sparks at minute gaps generated in the coil due to the difference in thickness after rolling are problematic. In addition, since both are lumpy, there is a problem that the resistance is small, and it is difficult to generate heat unless a large current flows, and the heating rate is low. 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 according to the frequency, and in other portions, heat is transmitted by heat transfer. There are problems that it is difficult to control the heating rate and that the temperature distribution tends to be large. Furthermore, in these heating methods, the thickness,
It is difficult to efficiently and quickly process metal coils having different widths, types, and weights alone, and it is more difficult to simultaneously process a plurality of metal coils.

Accordingly, the present invention provides a highly productive heating apparatus and method capable of efficiently, uniformly, continuously and stably heating a plurality of cylindrical or ring-shaped metal coils having different sizes, types and weights. The purpose is to do.

[0007]

The gist of the present invention is as follows.

(1) An iron core passing through the inside of a cylindrical or ring-shaped metal coil formed by winding a metal having an insulating substance or a film on the surface thereof and a core wound by a primary coil are separated from the outside of the metal coil. To form a transformer, and to form a secondary closed circuit by short-circuiting the winding start and end ends of the metal coil with a conductive member, and heat the metal coil by energizing the primary coil. In the heating device, a roller that allows an iron core penetrating the inside of the metal coil and an iron core wound with a primary coil to be detachable, and mounts the iron core penetrating the inside of the metal coil to be movable in the axial direction of the metal coil. A continuous heating device for a cylindrical or ring-shaped metal coil, comprising: a conveying device that carries in the metal coil to a position where the iron core penetrates and pays out after heating is completed.

(2) In the continuous heating device of (1), a current breaker or a voltage,
An apparatus for continuously heating a cylindrical or ring-shaped metal coil, comprising an adjusting circuit for adjusting at least one of current, power and phase.

(3) An iron core passing through the inside of a cylindrical or ring-shaped metal coil formed by winding a metal having an insulating substance or a film on the surface thereof and a core wound by a primary coil are separated from the metal coil. To form a transformer, and to form a secondary closed circuit by short-circuiting the winding start and end ends of the metal coil with a conductive member, and heat the metal coil by energizing the primary coil. In the heating method, an iron core penetrating the inside of the metal coil is moved in the axial direction of the metal coil in accordance with the heating condition of each metal coil, and the heated metal coil is paid out, and / or a new metal coil is discharged. A cylindrical or ring-shaped metal coil which is continuously heated by being carried into a position where the iron core penetrates and penetrating the iron core inside the core. The method of continuous heating.

(4) In the continuous heating method according to (3), the current is cut off in the middle of the conductive member, or at least one of voltage, current, power, and phase is adjusted, and each metal coil is adjusted. A method for continuously heating a cylindrical or ring-shaped metal coil, wherein the heating temperature is individually adjusted.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing a heating device for a cylindrical or ring-shaped metal coil according to the present invention, in which the metal coil 15 is still waiting for heating. A primary coil 3 that receives power from a primary power supply 4 is wound around the U-shaped iron core 2. A detachable iron core 1 is connected to the iron core 2 from the right in FIG. This allows
The iron cores 1 and 2 constitute a ring-shaped transformer.

In order to attach and detach the iron core 1 and the iron core 2, for example, the rollers 5, 6, 7, 8, 9, 10 are formed into a shape having a brim at an end as shown in FIG. , Iron core 2
In this state, the iron core 1 is pulled toward the iron core 2 and the iron core 1 is firmly pressed against the iron core 2 at the end face of the roller 11 as shown in FIG.

In the case of heating, first, a roller 11 which can move back and forth and up and down and a gantry 12 having wheels 13 are moved, and the roller 11 is placed under the iron core 1.
6, 7, 8, 9 and 10 have the same height. Then, in order to put the metal coil 15 placed on the transfer device 14 into the ring-shaped transformer, rollers 5 to 7 are
The rollers 8 to 10 are rotated by the motor 17 to move the iron core 1 in the axial direction as shown in FIG. Then, the metal coil 1
5 is carried on to the position where the iron core 1 penetrates as shown in FIG.

The metal coil 15 is placed on a transport device 14 having wheels 18 and 19, for example, as shown in FIG.
It is installed by supporting at 0 and 21. Here, an example in which a cart is used as the transfer device 14 is shown. However, the present invention is not particularly limited to conveyors, moving hooks, cranes, and the like. It is desirable to use a non-magnetic material as much as possible near 15. Also, in order to prevent the metal coil 15 from being insulated and short-circuited,
It is desirable to insulate where there is a high possibility of contact with 5. Further, since the metal coil 15 is heated to a high temperature, at least a portion in contact with the metal coil 15 needs to be insulated, and it is preferable to provide a lining of a refractory or a fire-resistant and heat-insulating ceramic.

The metal coil 15 is placed on the transfer device 14 in the state shown in FIG. 4, and the outer and inner ends of the metal coil 15 are short-circuited by the conductive member 22. The conductive member 22 may simply short-circuit the ends, or may turn on and off the current in the middle.
The heating temperature, power factor, and the like may be controlled by turning off or providing an adjustment circuit 23 for voltage, current, phase, and the like. The conductive member 22 and the adjustment circuit 23 are omitted in FIGS. 1, 5, 6, 7, and 8 to avoid complicating the drawing.

The metal coil 15 is placed on the transfer device 14 and moved, so that the iron core 1 penetrates through the space. Thereafter, the iron core 1 returns to the original position by reversing the rollers 5, 6, 7 and is pressed against the iron core 2, thereby forming a ring-shaped transformer again as shown in FIG. In this state, when a voltage is applied from the primary power supply 4 to the primary coil 3, a secondary voltage is induced in the metal coil 15. The generated secondary voltage causes a secondary current to flow by short-circuiting the ends of the metal coil 15, and the metal coil 15 is Joule-heated by the secondary current. Therefore, the iron core 1 penetrating the inside of the metal coil 15
Is affected by radiant heat from the metal coil 15,
At least the surface of the iron core 1 needs to be protected by a heat insulating material or the like, and in some cases, the iron core 1 needs to be forcibly cooled with oil or water.

To explain these principles in more detail, in FIG. 6, an iron core 1 made of an electromagnetic steel plate or the like penetrates through a space inside the metal coil 15 to form a magnetic circuit outside the metal coil 15. As shown in the figure, the ring-shaped transformer is detachably connected to the opening of the U-shaped iron core 2 to form a ring-shaped transformer. A U-shaped iron core 2 is wound with a primary coil 3 connected to a primary power supply 4 capable of adjusting voltage, current, and the like, to form a primary circuit of a transformer. On the other hand, the metal coil 15 through which the iron core 1 penetrates can maintain the insulation between the plates by forming a high-resistance film on the surface or by putting an insulator into the coil and winding it together. For example, when a thick scale layer is formed on the surface, such as hot-rolled metal, and it becomes a resistive layer enough to have insulation properties, or when an insulating film is intentionally provided on the surface layer, such as an electromagnetic steel sheet When the resistance between the coil layers is high in advance, as in the case of the like, the current flowing in the coil does not propagate on the surface of the adjacent metal but propagates inside the coil, so that a reliable 1T current is obtained. Next coil is formed. A secondary circuit is formed by short-circuiting both ends of the metal coil 15, in the example of FIG. 4, the outer and inner metal strips of the metal coil 15 with the conductive member 22. Thereby, when a primary voltage is applied from the primary power supply 4 to the primary coil 3, a secondary voltage corresponding to the ratio of the number of turns of the primary coil 3 to the number of turns of the metal coil 15 is directly induced in the metal coil 15. A secondary current flows in the metal coil 15 by the induced secondary voltage, so that the metal coil 15 itself is Joule-heated.

In the present heating method, since the current in the metal coil 15 flows almost uniformly in the width direction of the plate, the calorific value is the same in each part, so that uniform heating is possible. Further, in the present heating method, the electric power applied to the primary coil is directly induced in the secondary coil, so that the heating efficiency is extremely high. In other words, because the method of inducing power is by transformer coupling,
The Joule loss due to the extremely small loss and the secondary current generated in the metal coil 15 is only about the Joule loss due to the resistance of the short-circuited portion between the ends of the metal coil. If this is the case, Joule loss can be made extremely small, and the heating efficiency can be increased. Also, the secondary voltage V ₂ generated in the coil is
By the amount obtained by subtracting the product of the generated secondary current I ₂ and the coil overall resistance Rc occurs as electrode voltage E _2. That is, if this is expressed by an equation, the electrode voltage E ₂ = V ₂ −I ₂ × Rc = I ₂ ×
Rb (the sum of the resistance of the electrode and the conductive member). Where R
It is easy to set b to the order of mΩ by using copper. In this case, even if the secondary current is on the order of 10 3, it is at most on the order of V, and if the secondary current is a large value, But it is an extremely safe facility. This is because, for example, as a metal coil,
When heating to about 800 ° C for about 1 hour, a voltage of the order of KV must be applied to the end and end of the coil.
Although safety issues such as discharge and electric shock are large and difficult to realize, in this heating method, the total voltage generated inside the coil is also in the KV order, but the voltage appearing at the terminals is extremely small, as described above. It can be.

Next, an example in which a plurality of metal coils are continuously processed will be described.

FIG. 7 shows four metal coils 15, 24, 2
An example of heating 6, 28 will be described. First, as described above, the metal coil 15 is set in the transformer, and heating is performed for a certain time. Subsequently, the metal coil 24 mounted on the transfer device 25 is set in the transformer by the above-described method, and heating is continued for a certain time. The roller 11 used for moving and pressing the iron core 1 is retracted to a position where it does not interfere with the movement of the metal coil. This is repeated, and finally, in the example of FIG. 7, the four metal coils 15, 24, 26, 28
Is set in the transformer.

Next, a case where the metal coil is heated to a predetermined temperature and the metal coil is taken out will be described.

A method of taking out the metal coil 15 which has been heated first reaches a predetermined temperature will be described. First, rollers 11, 6, 7, 8, under the iron core 1,
Make it the same level as 9, 10. Then roller 5,
6, 7, 8, 9, and 10 are rotated, the iron core 1 is sent to the left side in the figure, and the iron core 1 penetrating the metal coil 15 is removed.
In this state, the heated metal coil is taken out of the heating device by moving the metal coil 15 downward in the drawing. Thereafter, the remaining metal coil is moved to the right side so as to be squeezed and the left side portion is opened, so that a new metal coil can be inserted, and heating is performed by the above method. By repeating these series of operations, a plurality of metal coils can be heated continuously.

Here, the case where the metal coils are heated in order has been described. However, it is also possible to take out the heated metal coil at an arbitrary position, and insert a new metal coil at that position and heat it.

In the present heating device, the metal coil 15,
When the sizes, weights, and types of the power supplies 24, 26, and 28 are substantially the same, the load on the secondary side is substantially the same, so that the power can be adjusted by the primary power supply 4. Metal coil 15, 2
When the sizes and weights (the number of windings) of 4, 26 and 28 change in the same manner, efficient heating is possible by providing taps on the primary coil side and switching the taps according to the load. . However, when the size, type, heating temperature and the like of each metal coil are different, there is a limit in controlling the heating of each metal coil on the primary side. for that reason,
In order to control the heating of each metal coil, as shown in FIG. 4, a current breaker or an adjustment circuit 23 capable of adjusting voltage, current, power, etc. is provided in the middle of the conductive member 22 to be short-circuited. By providing the adjustment circuit 23, 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. If control can be performed on the metal coil side in this way, even if the size, weight, type, heating temperature, etc. of the metal coil are different, it is possible to independently control the heating, and heat-treat a plurality of metal coils at once. Even if
Since the heating temperature can be controlled individually, the degree of freedom of operation can be greatly increased, for example, after heating to a predetermined temperature, maintaining the temperature at a constant value.

In the above description, the metal coil is described as being open to the atmosphere. However, the entire facility or the coil portion is made to have a furnace structure, and by taking measures against heat for the facilities such as the iron core, the heat dissipation is performed while controlling the atmosphere. It can be heated while preventing.

[0028]

According to the present invention, the metal coil can be heated in the same shape, and the problems of the generation of the heating temperature distribution and the extremely low productivity and heating efficiency, which are essential problems of batch heating, are solved. . That is, since heating is performed from the inside of the metal coil by the electric current, the heating time can be freely controlled, and since the temperature distribution and the heating efficiency are extremely good, the heating quality is good and the yield drop can be reduced, which greatly contributes to energy saving. In addition, since a plurality of coils having different types, sizes, and heating temperatures can be simultaneously and individually processed, productivity can be significantly improved and the degree of freedom in production can be increased. In addition, because it can be processed continuously, it does not require a long continuous heat treatment line, and it can process even those that cannot be processed by the continuous heat treatment line due to problems such as buckling. High quality heating is possible because of no occurrence. Further, in the present invention, since the voltage and current required for energization are directly induced in the coil, even when the required voltage is high, the voltage at the electrode portion can be extremely small, and
Since the heating length of the metal coil increases, the resistance increases.
Since the required current can be reduced, it is also advantageous in terms of equipment safety. Since the equipment can be made extremely compact and the heating efficiency is high and the power supply capacity can be reduced, it is very advantageous in terms of cost.

[Brief description of the drawings]

FIG. 1 is a plan view showing a standby state of a metal coil of a continuous heating apparatus for a metal coil according to the present invention.

FIG. 2 is a side view showing a roller used in the continuous heating device for a metal coil according to the present invention.

FIG. 3 is a side view showing a roller used in the continuous heating apparatus for a metal coil according to the present invention.

FIG. 4 is a view showing a metal coil transfer device used in the metal coil continuous heating device according to the present invention.

FIG. 5 is a plan view showing the continuous heating device for a metal coil according to the present invention when the metal coil is inserted.

FIG. 6 is a plan view showing the metal coil continuous heating device according to the present invention during energization heating of the metal coil.

FIG. 7 is a plan view showing a state in which a plurality of metal coils are energized and heated in the metal coil continuous heating device according to the present invention.

FIG. 8 is a plan view showing a state where the metal coil is removed after the continuous heating of the metal coil according to the present invention is completed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Iron core 2 Iron core 3 Primary coil 4 Primary power supply 5 Roller 6 Roller 7 Roller 8 Roller 9 Roller 10 Roller 11 Roller 12 Mount 13 Wheel 14 Transport device 15 Metal coil 16 Motor 17 Motor 18 Wheel 19 Wheel 20 Guide 21 Guide 22 Conductive member 23 Adjustment circuit 24 Metal coil 25 Transfer device 26 Metal coil 27 Transfer device 28 Metal coil 29 Transfer device

Claims (4)

[Claims] An iron core passing through the inside of a cylindrical or ring-shaped metal coil formed by winding a metal having an insulating material or a film on the surface thereof and a core wound by a primary coil outside the metal coil. Connected to form a transformer, and a secondary closed circuit is formed by short-circuiting the winding start and end of the metal coil with a conductive member, and heating the metal coil by energizing the primary coil In the apparatus, a roller that allows an iron core penetrating the inside of the metal coil and an iron core wound with a primary coil to be detachable, and a roller that places the iron core penetrating the inside of the metal coil and is movable in the axial direction of the metal coil. A conveying device that carries in the metal coil to a position where the iron core penetrates, and discharges the metal coil after the heating is completed. 2. The continuous heating device for a cylindrical or ring-shaped metal coil according to claim 1, wherein a current breaker or at least one of voltage, current, power, and phase is adjusted in the middle of the conductive member. A continuous heating device for a cylindrical or ring-shaped metal coil, characterized by comprising an adjusting circuit for performing the adjustment. 3. An iron core passing through the inside of a cylindrical or ring-shaped metal coil formed by winding a metal having an insulating material or a film on the surface thereof and a core wound by a primary coil outside the metal coil. Connected to form a transformer, and a secondary closed circuit is formed by short-circuiting the winding start and end of the metal coil with a conductive member, and heating the metal coil by energizing the primary coil In the method, an iron core penetrating the inside of the metal coil is moved in the axial direction of the metal coil according to a heating condition of each metal coil to pay out the heated metal coil, and / or the metal coil is renewed. A series of cylindrical or ring-shaped metal coils, characterized in that they are carried to a position where an iron core penetrates, and are continuously heated by passing the iron core through the core. Continuous heating method. 4. The method for continuously heating a cylindrical or ring-shaped metal coil according to claim 3, wherein a current is interrupted in the middle of the conductive member, or at least one of voltage, current, power, and phase is adjusted. And continuously adjusting the heating temperature of each of the metal coils by heating the metal coil.