JPH0373605B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a continuous annealing method suitable for magnetic field annealing of an amorphous alloy-wound core used in induction electrical equipment such as a transformer, and the method. It is related to the apparatus for carrying out the implementation.

[Prior Art] Recently, amorphous magnetic alloys (hereinafter simply referred to as amorphous alloys) have appeared as magnetic materials, and the use of these amorphous alloys in transformers is being considered.

Amorphous alloys are extremely thin strips and have the advantage of extremely low iron loss, but their annealing takes approximately
Must be performed in an inert gas at 400°C with a magnetic field applied.

When performing magnetic field annealing of conventional wound cores, after winding an excitation coil around each core, each core is carried into an annealing furnace together with the excitation coil, and after the inside of the furnace is evacuated, An inert gas was filled and annealing was performed at a predetermined temperature.

[Problems to be Solved by the Invention] However, the conventional method described above requires winding of the excitation winding for each core, which is extremely troublesome. Moreover, since the wound core is annealed in a high-temperature atmosphere, it is necessary to use a wound conductor with an expensive heat-resistant insulation coating as the conductor around which the excitation winding is wound, and the annealing cost is high. There was a problem.

We also proposed a method of annealing a large number of wound cores to be annealed by inserting them into an excitation conductor placed in an annealing furnace and applying current to the excitation conductor to apply a magnetic field to the many wound cores at once. However, the conventionally proposed methods do not allow for continuous delivery of the wound core to be annealed into the annealing furnace and to successively obtain the wound core that has been annealed. It was not suitable for continuous mass production.

Also known are methods for annealing the wound core in a magnetic field, as disclosed in JP-A-58-40811 and JP-A-58-81924. In the methods disclosed in these publications, a plurality of wound cores are arranged side by side in a furnace with their respective winding axes oriented in the horizontal direction. Further, a pair of excitation conductors extending horizontally through the furnace is provided, and one excitation conductor is arranged so as to skewer the window portions of the plurality of wound cores.
Then, one end of the pair of excitation conductors is electrically connected by a connecting piece, and a DC voltage is applied between the other ends of the pair of conductors from the excitation power source, thereby simultaneously applying a magnetic field to the plurality of wound cores. At the same time, multiple wound cores are annealed at once.

According to this method, magnetic field annealing of a plurality of wound cores can be performed at once without winding an excitation winding around each core. However, in this method, when carrying a new core into the furnace, the pair of excitation conductors and the excitation power source are disconnected, the core is removed from the furnace, and then the core is placed on the inlet side of the furnace. It is necessary to once remove the connecting piece that electrically connects one end of the pair of excitation conductors, insert one of the conductors into the window of the wound core, and then reattach the connecting piece. In this way, the conventional method requires complicated operations when bringing in a new core, making it difficult to carry a series of cores into a furnace continuously and perform magnetic field annealing. .

In addition, since a wound core made of an amorphous alloy does not have rigidity, if each core is arranged with its winding axis facing horizontally as in the conventional method, the shape of each core will collapse due to its own weight. , there was a risk that each winding core would come into contact with the excitation conductor. Therefore, in the conventional method, it is necessary to take special measures to maintain the shape of each core, which is difficult to implement.

Further, when the winding core is oriented horizontally, the winding core tends to fall over, so it is necessary to use a special device for transporting the winding core.

An object of the present invention is to provide a continuous annealing method for a wound core that can continuously obtain a wound core that has been annealed, and an annealing apparatus that implements the method.

[Means for Solving the Problems] The continuous annealing method of the first invention of the present application sequentially carries a wound core into a heating chamber of a furnace, and while conveying a plurality of wound cores along a conveyance path within the heating chamber. In the continuous annealing method of a wound core to be annealed, in the present invention, a plurality of magnetic field generating electrodes are arranged at equal length intervals along a conveyance path in a heating chamber. A plurality of wound cores are arranged with their respective winding axes oriented in the vertical direction, and as each wound core reaches a position corresponding to each magnetic field generating electrode in the process of transporting the wound cores along the conveyance path. Transport is stopped for a predetermined period of time.

During the period when each core is stopped, each magnetic field generating electrode is inserted into the window of the corresponding core and the magnetic field generating electrode is energized to excite each core.

After each core is excited for a predetermined period of time, the magnetic field generating electrode is pulled out from the window of the core, and each core is transported to a position corresponding to the next magnetic field generating electrode.

The second invention of the present application is a continuous annealing apparatus for carrying out the above method, and in the present invention, a furnace having a heating chamber and a plurality of wound cores arranged at equal intervals are arranged in the direction of each winding axis. A conveying device holds the core in a vertical direction and conveys it intermittently within the heating chamber, and the core is placed at equal length intervals along the conveyance path of the conveying device to penetrate through the window of the wound core when it is in a stopped state. A plurality of magnetic field generating electrodes are disposed so as to be displaceable between a position in which the magnetic field is generated and a position in which they are removed from the window, an upper electrode is in constant contact with the magnetic field generating electrodes, and the magnetic field generating electrode is disposed within the window of the wound core. A lower electrode that comes into contact with the magnetic field generating electrode when penetrated through the electrode, and an excitation power source that applies a voltage between the upper electrode and the lower electrode were provided.

[Function] As described above, in the method of the present invention, a plurality of magnetic field generating electrodes are provided at equal length intervals in the heating chamber of the furnace,
Each time each wound core carried into the heating chamber reaches a position corresponding to each magnetic field generating electrode, the conveyance is stopped for a predetermined period of time, and while the conveyance is stopped, the corresponding magnetic field generating electrode is placed in the window of the wound core. to excite the wound core. In this way, by stopping each core for a predetermined period of time during transport and energizing each core while each core is stopped, it is possible to feed multiple cores intermittently within the heating chamber. Therefore, a large number of wound cores can be continuously annealed in a magnetic field, and mass productivity of the wound core can be improved.

Furthermore, as described above, if the winding axis of each core is oriented vertically when it is transported, the shape of the core will not be significantly distorted even if the rigidity of each core is low. Therefore, when magnetically annealing a wound core with low rigidity, such as a wound core made of an amorphous magnetic alloy, there is no need to take special measures to maintain the shape of the wound core.

Furthermore, as described above, if the winding axis of each core is oriented in the vertical direction, there is no risk that the core will fall during transportation, so there is no need to use a special conveyance device.

Furthermore, according to the above method, the work of winding the excitation winding before annealing and the work of unwinding the excitation winding after annealing can be omitted, thereby simplifying the annealing work. I can do it.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view showing a continuous annealing apparatus for carrying out the method of the present invention, and FIG. 2 is a longitudinal sectional view taken along the line A--A in FIG. In these figures, 1 is a furnace in which a front chamber 2, a heating chamber 3, and a rear chamber 4 are connected. A boundary position between the front chamber 2 and the heating chamber 3, a boundary position between the heating chamber 3 and the rear chamber 4, and an entrance 2a of the front chamber 2,
A partition door 5 that can be opened and closed is provided at each of the carry-in port 4a of the rear chamber 4, and the partition doors 5 provided at the carry-in port 2a and the carry-in port 4a are configured to airtightly close the carry-in port 2a and the carry-out port 4a. It is provided.

Further, in the lower part of the furnace 1, there is a roller conveyor 6 extending from the front of the loading port 2a to the rear of the loading port 4a.
are arranged in two rows in parallel in a direction perpendicular to the plane of the drawing, and the roller conveyor constitutes a conveying device that intermittently conveys the wound core to be annealed. In the present invention, with this conveyance device,
Each core to be annealed is intermittently transported with its winding axis oriented in the vertical direction.

A gas supply pipe 3a for supplying inert gas into the heating chamber 3 is provided on the ceiling wall of the furnace 1.

Further, along the conveying direction of the roller conveyor 6, a plurality of magnetic field generating electrodes 7 are arranged at equal length intervals. The lower side 7a of each magnetic field generating electrode 7 is formed to have a circular cross section, and the lower side 7a slidably passes through a sealed heat-resistant slide bearing 17 attached to the ceiling wall of the furnace. is inserted into the heating chamber 3. On the bottom wall of the furnace,
A heat-resistant bearing 17 with a seal that shares an axis with each magnetic field generating electrode 7 attached to the ceiling wall is attached, and each magnetic field generating electrode 7 penetrates the bearing 17 on the bottom wall side and protrudes below the heating chamber. I'm starting to get it.

The upper side 7b of each magnetic field generating electrode 7 is formed into a prismatic shape, and a rack gear G is formed on one surface thereof, and a pinion P attached to the rotating shaft 8a of the drive motor 8 is meshed with the rack gear G. .

An upper electrode 9 is disposed above the furnace 1 and is in constant contact with the lower side 7a of each magnetic field generating electrode 7. An upper electrode 9 is disposed below the furnace 1 and extends downward through a lower bearing 17. A lower electrode 10 is disposed in contact with the lower end of the magnetic field generating electrode 7. The lower end of the magnetic field generating electrode 7 is formed into a hemispherical shape to facilitate contact with the lower electrode 10.

Each upper electrode 9 and each lower electrode 10 are commonly connected by lead wires L, L, respectively, and the upper electrode 9
Lead wires connected to the lower electrode 10 and the lower electrode 10 are connected to different output terminals of an AC or DC power source 11 for generating a magnetic field.

Even if gas leaks from the part of the furnace 1 penetrated by the magnetic field generating electrode 7 (the hole inside the bearing 17 provided on the ceiling wall side of the furnace), the gas will not leak to the outside air. Therefore, an upper shield cover 12 having a bottomed cylindrical shape and having an airtight structure is removably attached to the upper part of the furnace 1.

A removable lower shield cover 12' is provided on the lower surface side of the furnace 1 for each lower electrode 10.
The lower shield cover 12' includes each lower electrode 10,
The lower shield cover 12' is provided to airtightly cover the tip of the magnetic field generating electrode 7 in contact with the lower electrode 10, and the lower shield cover 12' protects the magnetic field generating electrode 7 from the lower bearing 17. When the bearing 17 is pulled out, gas leakage from the bearing 17 to the outside is prevented.

A tray 13 is placed on the roller conveyor 6, and a through hole 13a is provided in the center of the tray 13 through which the magnetic field generating electrode 7 passes. This through hole 13a is provided so as to be aligned with the upper and lower bearings 17, 17.
In the present invention, a wound core 14 with its winding axis oriented vertically is placed on this tray 13.

The drive motor 8 is attached to the side surface of the upper shield cover 12, and by rotating the drive motor 8 in one direction, the magnetic field generating electrode 7 is lowered, and by rotating the motor in the opposite direction, the magnetic field is generated. The generation electrode 7 is raised to be inserted into and removed from the furnace.

An operating protrusion 7c that protrudes laterally is provided at the upper end of the magnetic field generating electrode 7, and a limit switch 15 is provided at the upper inside of the casing 12 to move the magnetic field generating electrode 7 to its upper limit position. When this occurs, the operating projection 7c operates the limit switch 15, and the limit switch 15 generates a signal that enables the roller conveyor 6 to rotate.

Water-cooled tubes 16 are wound around the outer surfaces of the upper electrode 9 and the lower electrode 10, and cooling water is allowed to flow through each of the water-cooled tubes 16 to suppress a rise in temperature of the electrodes.

The partition door 5 and the roller conveyor 6 can be driven only when the magnetic field generating electrode 7 is moved to the upper limit position and the limit switch 15 is activated. Each partition door 5 and roller conveyor 6 are operated by an operating device (not shown) as described below.

First, the partition door 5 of the carry-out port 4a is opened, and only the roller conveyor 6 in the rear chamber 4 is driven for a predetermined period of time.
After the conveyor 6 stops, the partition door 5 of the exit 4a is closed.

Next, a partition door 5 provided at the boundary between the front chamber 2 and the heating chamber 3 and between the heating chamber 3 and the rear chamber 4,
Open 5 and check the roller conveyor 6 in each room.
is driven for a predetermined period of time, and after the conveyor stops, the partition doors 5, 5 are closed.

Thereafter, only the partition door 5 of the carry-in port 2a is opened, only the roller conveyor 6 in the front chamber 2 and in front of the carry-in port 2a is driven for a predetermined period of time, and after the conveyor has stopped, the partition door 5 is closed. The operating device then repeats the same operation as above.

The above-mentioned parts constitute a continuous annealing apparatus that carries out the method of the present invention.

Next, a continuous annealing method using the continuous annealing apparatus described above will be described in detail with reference to FIGS. 1 and 2. FIG. 1 shows a state in which a plurality of trays 13 carrying wound cores 14 with their winding axes oriented in the vertical direction are arranged side by side on a roller conveyor 6 and magnetic field annealing is performed.

The temperature inside the heating chamber 3 is raised to a predetermined annealing temperature by a heating means (not shown), and the inside of the heating chamber 3 is filled with an inert gas.

In the state shown in Figure 1, all roller conveyors 6
is stopped, and each magnetic field generating electrode 7 is connected to the wound core 1.
4, the through hole 13a of the tray, and the lower bearing 17, and the lower end of each magnetic field generating electrode 7 is brought into contact with the lower electrode 10. A current is applied to each magnetic field generating electrode 7 from an AC or DC power source 11, and a magnetic field generated around each magnetic field generating electrode 7 is applied to each winding core 13.

After the energization to the magnetic field generating electrode 7 reaches a predetermined time, the energization is stopped. Next, the drive motor 8 is driven to raise the magnetic field generating electrodes 7, and each magnetic field generating electrode 7 is separated from the window portion of the wound core 14.
When each magnetic field generating electrode 7 reaches its upper limit position, the limit switch 15 is activated, and the partition door 5 and roller conveyor 6 are driven based on the detection signal obtained by the limit switch.

At this time, first, the partition door 5 of the carry-out port 4a is driven to pull it upward, and then the roller conveyor 6 in the rear chamber 4 and behind it is driven to carry out the rolled iron core 14 in the rear chamber 4 from the furnace 1. . Thereafter, the partition door is driven and pulled down, and the roller conveyor 6 is stopped.

Next, after pulling up the partition doors 5, 5 provided at the boundaries between the heating chamber 3, the front chamber 2, and the rear chamber 4, the roller conveyors 6 in the front chamber 2, heating chamber 3, and rear chamber 4 are driven. . As a result, the wound core 14 in the front chamber 2
is carried into the heating chamber 3, and the wound core 14, which was located in front of the rear chamber, is transported into the rear chamber 4. Wound core 14
When the heating chamber 3 is conveyed, the driving of the roller conveyor 6 is stopped, and the partition doors 5, 5, which had been pulled upward, are pulled down to seal the heating chamber 3 again.

Next, the magnetic field generating electrode 7 is pulled down and inserted into the center hole of the wound core 14, the lower end of the magnetic field generating electrode 7 is brought into contact with the lower electrode 10, and the magnetic field generating electrode 7 is energized. As a result, each wound core 14 in the heating chamber 3 is energized. After the excitation has been carried out for a predetermined period of time, the energization is stopped and the magnetic field generating electrode 7 is pulled upward again, and then the partition door 5 of the entrance 2a is pulled upward to drive the front chamber 2 and the roller conveyor 6 in front of it. do. As a result, one wound core 14 located in front of the entrance 2a is transported into the front chamber 2. When the wound core 14 has been conveyed, the roller conveyor 6 is stopped, and the partition door 5 at the entrance of the front chamber 2 is pulled down to seal the front chamber 2. Thereafter, the same operation as described above is repeated, and the wound cores 14 that have been subjected to magnetic field annealing are successively taken out one by one at predetermined time intervals from the outlet 4a.

As mentioned above, if the winding axis of the wound core is maintained in the vertical direction during transportation,
Each winding core deforms due to its own weight and the magnetic field generating electrode 7
Since there is no contact with the core, there is no need to take special measures to maintain the shape of each core, and the configuration of the device can be simplified.

In the above embodiment, the front chamber 2 and the rear chamber 4 are provided before and after the heating chamber 3, and these chambers are separated by a partition door 5 that can be opened and closed freely, and the heating chamber 3 is sealed at the entrance. 2a or the carry-out port 4a is opened to carry in and out the wound core 14 into the furnace 1.
Outside air does not directly flow into the heating chamber 3 to introduce unnecessary oxygen, and the temperature inside the heating chamber 3 does not drop.

In the above embodiment, the magnetic field generating electrode 7 is moved up and down by the drive motor 8, the rack gear G, and the rack pinion P. However, it is of course possible to move the magnetic field generating electrode 7 by a chain drive, a pneumatic pressure, a hydraulic cylinder, etc. It is.

Furthermore, it goes without saying that the trays within the furnace may be transported not only by a roller conveyor system but also by a drive roller system, a tray pusher system, or the like.

Further, in the above embodiment, the upper electrode 9 and the lower electrode 10 are formed in a ring shape, but electrodes having other structures such as a structure in which the magnetic field generating electrode is slidably held between two opposing holding members may be used. may also be used.

Further, in the above embodiment, the upper electrode 9 and the lower electrode 10 are provided with water cooling pipes, but these electrodes may also be provided with gas cooling pipes for refrigerant gas or the like.

[Effects of the Invention] As described above, according to the present invention, a plurality of magnetic field generating electrodes are provided at equal length intervals in the heating chamber of a furnace, and each core carried into the heating chamber corresponds to each magnetic field generating electrode. Each time a position is reached, the conveyance is stopped for a predetermined time, and while the conveyance is stopped, the corresponding magnetic field generating electrode is inserted into the window of the wound core to excite the wound core. The wound iron core can be fed intermittently in the heating chamber. Therefore, magnetic field annealing of a large number of wound cores can be performed continuously, and mass productivity of the wound core can be improved.

Further, in the present invention, since the winding axis of each core is oriented in the vertical direction when the core is transported, even if the rigidity of each core is low, the shape of the core will not be significantly distorted. Therefore, when magnetically annealing a wound core with low rigidity, such as a wound core made of an amorphous magnetic alloy, there is no need to take special measures to maintain the shape of the wound core. Furthermore, if the winding axis of the winding core is oriented in the vertical direction, there is no risk that the winding core will fall during transportation, so there is no need to use a special transport device, and the configuration of the device can be simplified.

Further, according to the present invention, it is possible to omit the work of winding the excitation winding before annealing and the work of unwinding the excitation winding after annealing, thereby simplifying the annealing work. can.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing a schematic structure of a continuous annealing apparatus according to the present invention, and FIG. 2 is a cross-sectional view taken along the line A--A in FIG. 1. 1...furnace, 2...front chamber, 3...heating chamber, 4...
Rear chamber, 5... Partition door, 6... Roller conveyor (transport device), 7... Electrode for magnetic field generation, 9... Upper electrode, 10... Lower electrode, 13... Tray, 14...
...Wound iron core.

Claims (1)

[Scope of Claims] 1. A continuous annealing method for a wound core in which a wound core is sequentially carried into a heating chamber of a furnace, and a plurality of wound cores are annealed while being conveyed along a conveyance path within the heating chamber, comprising: A plurality of magnetic field generating electrodes are arranged at equal length intervals along the conveyance path, the plurality of wound cores are arranged with their respective winding axes oriented in a vertical direction, and the wound cores are arranged along the conveyance path. During the process of transporting each core, each time it reaches a position corresponding to each magnetic field generating electrode, the transport is stopped for a predetermined period of time, and during the period when each core is stopped, each magnetic field generating electrode is moved to the corresponding position of the core. Each core is energized by passing it through the window and energizing the magnetic field generating electrode. After energizing each core for a predetermined period of time, the magnetic field generating electrode is pulled out from the window of the core and the next core is inserted. A continuous annealing method for a wound iron core characterized by transporting it to a position corresponding to a magnetic field generating electrode. 2. A furnace having a heating chamber; and a conveying device that holds a plurality of wound cores arranged at equal intervals with their respective winding axes facing vertically and conveys them intermittently within the heating chamber. , disposed at equal length intervals along the conveying path of the conveying device, and displaceable between a position where the wound core in a stopped state penetrates the inside of the window and a position where it leaves the window. a plurality of magnetic field generating electrodes; an upper electrode that is always in contact with the magnetic field generating electrode; and a lower electrode that is in contact with the magnetic field generating electrode when the magnetic field generating electrode passes through the window of the wound core; A continuous annealing apparatus for a wound core, comprising: an excitation power source that applies a voltage between the upper electrode and the lower electrode.