JPH0351281B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an improvement in an apparatus for efficiently annealing a wound core formed by winding an amorphous magnetic ribbon in a magnetic field.

[Technical background of the invention]

Conventionally, iron cores used in stationary induction devices such as power distribution transformers are formed by winding a silicon steel strip to form a wound core, and this wound core is annealed to remove distortion generated during winding. At this time, since a silicon steel strip was used for the wound core, it was sufficient to perform heat annealing. However, in recent years, amorphous magnetic ribbons with very low core loss have been developed and are now being put into practical use as cores for stationary induction equipment such as transformers. Unlike silicon steel strips, which are produced by repeating rolling and annealing, this amorphous magnetic ribbon is produced in the form of a strip with a thickness of 150 μm or less using a melt super-quenching method.
However, the amorphous magnetic ribbon has a large residual strain in the rapidly cooled state, and if a wound core is formed in this state, the magnetic properties will be extremely poor and the iron loss will increase. Therefore, when in use, the wound core is annealed in a magnetic field in an inert gas atmosphere.
By arranging the magnetic domains 180° in the longitudinal direction of the amorphous magnetic ribbon, we aim to improve core loss and excitation current.

[Problems with background technology]

When performing the above magnetic field annealing, for example, the sixth
As shown in the figure, an excitation coil 2 was wound around a wound core 1 made of an amorphous magnetic ribbon, and this wound core 1 was placed in a box-shaped annealing furnace 3, and inert gas was injected. In this state, the inside of the furnace was maintained at the optimum annealing temperature, and in this state, a switch 4 was turned on to flow a direct current to the excitation coil 2, and the wound core 1 was annealed in a magnetic field in an inert gas atmosphere. .

However, when an amorphous magnetic ribbon is used as a material for a wound core, the step of annealing in a magnetic field poses a major problem when mass producing the wound core 1. That is,
Since it is inefficient to perform annealing in a magnetic field by winding each wound core 1 with an excitation coil 2, it may be possible to increase the annealing efficiency by annealing a large number of wound cores at once. In this method, when a large number of wound cores are annealed at once, the heat capacity of the wound core increases and it takes time to raise the temperature, and it becomes difficult to heat each wound core at a uniform temperature. Variations in magnetic properties are likely to occur.
In addition, some of the wound cores are exposed to high temperatures for long periods of time, and it takes time to cool down the wound core after annealing, resulting in deterioration of core properties and brittle materials. Furthermore, during the above-mentioned annealing, the excitation coil must be wound and removed from each wound core, which takes a lot of time and effort, and these points make it difficult to prepare amorphous magnetic ribbons. This was a major factor hindering mass production of the wound iron cores used. Furthermore, since the excitation coil is exposed to considerably high temperatures, the electric wires used in the excitation coil must be subjected to special heat-resistant treatment.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks, and when annealing a wound core made of amorphous magnetic ribbon in a magnetic field,
It is an object of the present invention to provide an annealing device that can streamline the annealing work of this type of wound core by continuously performing annealing in a magnetic field without winding an excitation coil around each wound core.

[Summary of the invention]

The present invention consists of an annealing furnace consisting of a heating chamber, a soaking chamber, and a cooling chamber, and an inert gas atmosphere inside the furnace, and annealing of a wound core made of amorphous magnetic ribbon. The wound core is gradually heated in a heating chamber to an annealing temperature and transported to a soaking chamber, and annealed in a magnetic field while the wound core is transported from the soaking chamber to the next cooling chamber and out of the annealing furnace. As a result, the annealing work of this type of wound core is carried out continuously in an assembly line process, and when annealing in a magnetic field, the excitation conductor passed through the window of the wound core is placed on a transport platform of the wound core before annealing. When the wound core is fixed through an insulator and transported to the soaking chamber and the cooling chamber of the annealing furnace, the excitation conductor is placed on a transfer table inside the furnace wall of each chamber from the soaking chamber to the cooling chamber. The fixed contacts arranged at intervals corresponding to the width dimension that the transport platform moves by one vehicle are brought into contact with the fixed contacts arranged at intervals corresponding to the width dimension that the transport platform moves by one vehicle, and a DC current is applied to the excitation conductor. The present invention is characterized in that the wound iron core is annealed in a magnetic field efficiently and economically by flowing it intermittently.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5.

In FIG. 1, 11 is an annealing furnace body for annealing the wound iron core 1, which is the material to be annealed.
is constructed by arranging a heating chamber 12, a soaking chamber 13, and a cooling chamber 14 so that they can communicate with each other from right to left in FIG. Opening/closing doors 15a, 16a which are opened and closed by means 15, 16 are attached. 17 is a front chamber arranged on the entrance side of the heating chamber 12 so as to be able to communicate with the heating chamber 12, and 18 is an opening/closing door 18 of this front chamber 17.
19 is a rear chamber arranged on the outlet side of the cooling chamber 14 so as to be able to communicate with this cooling chamber 14; 20 is a cylinder that opens and closes the opening/closing door 20a of the rear chamber 19; A roller conveyor 11a is disposed in the chamber, and heaters 21 are disposed on the furnace walls of the heating chamber 12 and the soaking chamber 13, as shown in FIG. Further, in the cooling chamber 14, a water pipe 22 is arranged in a meandering manner near the ceiling thereof, penetrating the furnace wall. Reference numeral 23 denotes an elongated conveyor disposed in front of the annealing furnace main body 11 and parallel to the main body 11 at a distance, and rollers driven by electric motors M ₁ and M ₂ are provided at the front and rear ends of the conveyor 23. Conveyors (hereinafter referred to as electric rollers) 24 and 25 are arranged in series. In addition, a roller 19 installed in the rear chamber 19
a, this rear chamber roller 19a and the series of exit rollers 26 are driven by an electric motor _M3 . 28 is a conveyance roller that conveys the annealed wound core 1 conveyed by the exit roller 26 to the electric roller 25 side, and 27 is a conveyance roller for conveying the material to be annealed conveyed by the electric roller 24 to the front chamber 17. be. In this way, in the present invention, the annealing furnace A has the annealing furnace main body 11
and a conveyor 23 are arranged in parallel, and between the electric rollers 24 and 25 at both ends of this conveyor 23 and the annealing furnace main body 11, there is a lateral conveyor for conveying the material to be annealed to the annealing furnace main body 11 side or to the conveyor 23. The feed rollers 27 and 28 are arranged in a bridging manner so that the planar shape becomes a rectangular frame shape.
One of the transverse feed rollers 27 is attached with a push cylinder 29 that moves the material to be annealed conveyed by the electric roller 24 to the front chamber 17.
An insertion cylinder 30 for moving the material to be annealed inserted into the front chamber 17 into the annealing furnace main body 11 is attached to the outside of the front chamber 17 . Further, at one end of the other lateral feed roller 28, there is also a pushing cylinder 29a for moving the material to be annealed, which has been moved onto this roller 28 by the exit roller 26, toward the electric roller 25.
At the other end of the transverse feed roller 28, there is a push cylinder 29b for moving the material to be annealed onto the electric roller 25.
are arranged respectively. At each corner of the annealing furnace A where the pushing cylinders 29, 29a, 29b and the insertion cylinder 30 are arranged, there is an auxiliary roller (not shown) that rotates in a direction perpendicular to the roller arranged at this corner. , are disposed so as to be movable up and down by an elevating device, and when a conveyance table, which will be described later, moves to each corner of the annealing furnace A, the auxiliary rollers rise and the conveyance table is mounted. 31 are each chamber of the annealing furnace main body 11 and the front and rear chambers 1
An inert gas tank 32 is supplied to the front and rear chambers 17, 19 through valves a to e.
Vacuum pump, LS _{1 to LS 1} through valves f and g
LS ₄ is a limit switch that controls the drive of electric motors M ₁ and M ₃ .

Next, the structure of the magnetic field annealing device 40 installed in the annealing furnace main body 11 will be described in detail with reference to FIGS. 2 to 5. As shown in FIGS. 2 and 3, a transfer table 41 is moved to the furnace wall of the soaking chamber 13 and the cooling chamber 14 by one unit (width dimension of the end surface of the conveyor table 42 facing the furnace wall). A pair of lead-out conductors are fixed by penetrating into the furnace from the tops of both sides of the furnace wall to the vicinity of the end of the roller conveyor 11a orthogonal to the moving direction of the conveyor table 42, with an interval corresponding to the dimensions of the furnace wall being maintained. A clamp-type fixed contact 43 shown in FIG. 2 is attached to the protruding ends of each outlet conductor 41 that protrude into the furnace and are opposed to each other. Moreover, the end of each lead conductor 41 protruding outside the furnace is connected between the end of the adjacent lead conductor 41 as shown in FIG.
They are connected in series using a connecting cable 44, and the ends of the connecting cable 44 are connected to a DC power source 46 via a switch 45, respectively. On the other hand, as shown in FIG. 4, the conveyor table 42 is formed of heat-resistant cast steel or the like in a rectangular lattice shape, and carries the required number of wound cores 1 to be annealed in a magnetic field and transfers them to the annealing furnace main body 11. transport. Insulators 47, 47 are attached to the side ends of the conveyor table 42 in a direction perpendicular to the direction of movement (the direction of the arrow in FIG. 4), with the insulators 47 facing upward. An excitation conductor 48 made of a good conductor such as copper or stainless steel is attached to the iron core 1.
Removable, soaking chamber 13, cooling chamber 14
A lead conductor 4 protruding from the inside at a predetermined interval.
It is attached so that it can come into contact with and separate from the fixed contact 43 at the tip.

In addition, each cylinder 15, 16, 20, 29, 29
a, 29b, 30, electric motors _M1 to _M3 , vacuum pump 32, switches 45, valves a to g, and limit switches _LS1 to _LS4 are operated by command signals from a control device (not shown). Further, an inert gas is supplied and maintained at a constant pressure to each chamber 12 to 14 of the annealing furnace main body 11 while the annealing furnace A is in operation.

Next, the operation of the present invention will be explained with reference to FIG.

When starting the annealing of the wound core 1, as a preparatory work, the inside of the annealing furnace body 11 is made into an inert gas atmosphere in advance, and the heating chamber 12, soaking chamber 13, and cooling chamber 14 in the annealing furnace body 11 are The respective temperatures are maintained at a temperature at which the annealing work can be carried out smoothly by the heater 21 and cooling water, and a conveyor table 42 is mounted on the electric roller 25, conveyor 23, and electric roller 24 shown in FIG. Place them without leaving any gaps as shown in Figure 3. Then, from the leading conveying table 42 located on the side of the electric roller 24 as a base point, the last conveying table 42 of these conveying tables 42 is divided into the number of conveying tables 42 that can be accommodated in the soaking chamber 13 and the cooling chamber 14. The excitation conductor 48 is fixed by fitting both ends of the excitation conductor 48 into the bolts 49 protruding from each insulator 47, 47 of the other conveyor table 42, leaving only the .

After the above preparatory work is completed, the excitation conductor 48
After the last conveyor 42 to which only the excitation conductor 48 is attached, the conveyor 42 without the excitation conductor 48 is placed on the conveyor 23 and the electric roller 25, and these conveyors 42 have the windings to be annealed. A plurality of iron cores 1 are mounted with their windows facing the furnace wall side, and as shown in FIG. 47,47
The excitation conductor 48 is fixed to the insulators 47, 47 by fitting it into the bolt 49 projecting upward and screwing the nut 50 onto the bolt 49. In this state, the electric motors M ₁ and M ₂ are started, and one conveyor table 42 located at the leading edge of the electric roller 24 (the right end in FIG. 1)
(the one on which the wound core 1 is not mounted) is moved onto the transverse feed roller 27. When the conveyance table 42 is placed on the side of the cylinder 29 of the transverse feed roller 27, the limit switches LS ₁ and LS ₂ are activated and the electric motors M ₁ and M ₂ are activated.
temporarily stop. Immediately after the conveyance table 42 is moved by the transverse feed roller 27, it is placed on an auxiliary roller that is moved upward by a lifting device (not shown). Transverse feed roller 2 by the length dimension of 48
Move on 7. After the movement, the auxiliary roller descends.
Note that there is a gap at the end of the electric roller 25 (the left end in FIG. 1) corresponding to the size of one conveyance table 42, so a new conveyance table is placed in this gap, and then a new conveyance table is placed on it. The wound core 1 is placed on top of the winding core 1, and the excitation conductor 48 is set in the same way as in the previous stage (first work W ₁ ). In this way, when the first work W ₁ is repeated several times and the leading conveyance table 42 reaches in front of the opening/closing door 18a of the front chamber 17,
The opening/closing door 18a is opened by the cylinder 18. Subsequently, each conveyance table 42 on the cross feed roller 27 is pushed by the cylinder 29, and the conveyance table 42 located at the tip of the cross feed roller 27 enters the front chamber 17, and after entering, the cylinder 18 is activated, and the front chamber 17 is closed by the opening/closing door 18a. Next, start the vacuum pump 32 to create a certain degree of vacuum in the front chamber 17, and then add the tank 3 to the front chamber 17.
Inject inert gas from 1 (valve a, e,
f and g are set to automatically open and close according to the operation of the vacuum pump 32). After injecting the inert gas, the opening/closing door 15a is opened by the cylinder 15,
The transfer table 42 of the front chamber 17 is pushed into the heating chamber 12 by the insertion cylinder 30 by a width corresponding to one car, and the heating chamber 12 is closed by the opening/closing door 15a (second work W). ₂ ).

By sequentially repeating the first and second operations W ₁ and W ₂ described above, the leading end of the conveyance table 42 on which the rolled iron core is not placed on the roller conveyor 11a in the heating chamber 12 reaches the soaking chamber 13. When the conveyance table 4 is conveyed to
Both ends of the excitation conductor 48 fixed to the side ends of the 2 (in the direction perpendicular to the direction of movement of the conveyor table 42) are fixed contacts attached to the tips of the lead conductors 41, 41 protruding into the soaking chamber 13. It makes contact with the children 43 and 43 in a pinching manner. By performing the first and second operations W ₁ and W ₂ , the soaking chamber 13 and the cooling chamber 14 are
When the conveyance table 42 on which the wound core 1 is not loaded is sequentially conveyed and the head of the conveyance table 42 reaches the exit side of the cooling chamber 14, the conveyance table 42 with the wound core 1 placed on it is placed at the entrance of the soaking chamber 13. The stand 42 is transported. Therefore, as shown in FIG.
are in contact with the fixed contacts 43, 43 of the lead conductors 41, 41, respectively, and therefore each excitation conductor 48
constitute a series circuit via a cable 44 and are connected to a DC power source 46 via a switch 45.
At this point, the switch 45 is turned on and direct current flows through each excitation conductor 48, so that the wound core 1 mounted on the conveyor table 42 located at the entrance of the soaking chamber 13 is annealed in a magnetic field. The magnetic field annealing time is approximately 10 to 30 minutes in this example (the third operation
_W3 ).

After performing the third work W ₃ as described above, the second and first works W ₂ and W ₁ are performed again. At this time, that is, at the time of the second work _W2 , the door 15a of the heating chamber 12 is opened by the cylinder 15, and at the same time, the door 16a on the exit side of the cooling chamber 14 is opened by the cylinder 16. 1 of the conveyor table 42 using the pushing cylinder 30.
Move by the width dimension equivalent to the width of the table. Therefore, the transport platform 42 located at the exit of the cooling chamber 14 and not carrying the wound core 1 is moved from the cooling chamber 14 to the rear chamber 19.
The heating chamber 12 and the cooling chamber 14 are closed by the opening/closing doors 15a and 16a (fourth work _W4 ), and then the third work _W3 to the first work _W1 Then, the carrier 42 on which the wound core 1 is sequentially placed in the soaking chamber 13 and the cooling chamber 14 is transported, and the wound core 1 is intermittently annealed in a magnetic field.

Each of the fourth, third, second, and first operations W ₄ to _{W 1}
When the opening/closing door 20a of the rear chamber 19 is opened by the cylinder 20, the electric motor _M3 is started to drive the roller 19a in the rear chamber 19, and the conveyor table 42 in the rear chamber 19 is moved to the exit roller 26. move it to. The electric motor _M3 is configured to operate a limit switch after the conveyor table 42 has moved to the end of the exit roller 26.
LS ₃ starts and stops. After that, the rear chamber 19 is closed by the opening/closing door 20a, and like the front chamber 17, the rear chamber 19 is evacuated via the valve g by the vacuum pump 32, and then the rear chamber 19 is evacuated via the valve g from the tank 31 via the valve e. Supply inert gas (fifth operation W ₅ ). After this, 4th work W ₄ ~ 1st work
Perform W ₁ in sequence.

When the fifth work _W5 to the first work _W1 are completed, the exit roller 26 is driven by the electric motor _M3 ,
The conveyor table 42 on the exit roller 26 is moved by the transverse feed roller 2
Move it up to 8. The conveyor table 42 is the transverse feed roller 2
8, limit switch LS ₄ operates to stop electric motor M ₃ . Subsequently, the conveyor table 4 on the transverse feed roller 28 is moved by the push cylinder 29a.
2 toward the electric roller 25 side. (Sixth task
W ₆ ) When the sixth work W ₆ to the first work W ₁ are performed in sequence and the conveyance table 42 is conveyed to the electric roller 25 side of the transverse feed roller 28, this conveyance table 42 is moved by the push cylinder. 29b onto the electric roller 25 (seventh work W ₇ ). At this point, the excitation conductor 4
The conveyor table 42 to which only the core 8 is fixed is loaded with the wound core 1 to be annealed with the excitation conductor 48 removed.

In this way, at the start of annealing, the excitation conductor 48
The necessary number of conveyor tables 42 equipped with only the annealing furnace body 1
When the wound core 1 is transported into the cooling chamber 14 and the above-mentioned first operation W ₁ to seventh operation W ₇ is repeated in sequence, the wound core 1 that has been annealed in the magnetic field is discharged from the cooling chamber 14 . Therefore, by performing the above operations continuously, the conveyor 23, the lateral feed roller 27, the annealing furnace main body 11, the rear chamber 19, the exit roller 26, the lateral feed roller 28, and the electric roller 25 will be annealed from now on. Winding core 1
The conveyor table 42 carrying the wound core 1 which is being annealed and which has been annealed is placed in contact with each other. As a result, when the seventh work _W7 is completed, the conveyor table 42 carrying the wound core 1 that has been annealed is conveyed onto the electric roller 25 at regular intervals by the pushing cylinder 29b. The excitation conductor 48 is removed from the conveyor table 42, and the annealed core 1 is carried to the next process by lifting means such as a crane, and then the core 1 to be newly annealed is transferred to the conveyor table. Aboard the 42. Then, the above-described first work _W1 to seventh work _W7 are repeatedly performed in sequence. in this way,
In the present invention, the conveyor table 42 on which the material to be annealed (wound core 1) is mounted is transferred one after another to the above-mentioned work process (first work).
According to steps W ₁ to W ₇ ), the annealing operation of the wound core 1 around which the amorphous magnetic ribbon is wound is continuously performed during approximately one revolution of the annealing furnace A.

In particular, when annealing in a magnetic field, the annealing furnace main body 11
The wound core 1 transported to the heating chamber 12 is heated to a temperature suitable for annealing while being transported within this heating chamber 12, and when transported to the next soaking chamber 13, it is maintained at the annealing temperature. While being transported to the next cooling chamber 14, each time the transport stage 42 moves by a width dimension corresponding to one transport stage, the conductor 48 passing through the wound core 1 fixes the lead conductor 41 provided on the furnace wall. It contacts the contactor 43 and is energized to anneal the wound core 1 in a magnetic field.
That is, in the present invention, the wound core 1 is moved by a width corresponding to one conveyance table 42 between the time when the temperature is maintained at the optimum temperature in the soaking chamber 13 and the time when it is slowly cooled in the cooling chamber 14. Since the structure is such that annealing in a magnetic field can be performed intermittently every time, a wound core with excellent magnetic properties can be obtained. Furthermore, during annealing, the above-mentioned first work W ₁ to seventh work W ₇ can be performed by command signals from a control device (not shown), so automatic control of the annealing furnace A becomes possible. It is possible to provide an annealing device that continuously performs annealing work on a seed-wound core.

〔Effect of the invention〕

Since the present invention is configured as described above, it has the following effects.

In the present invention, when annealing a wound core formed by winding an amorphous magnetic ribbon, a plurality of wound iron cores are placed on a conveyor table mounted on a conveyor, and the excitation is passed through a window of the wound core. In this state, each of the carriers is successively carried into an annealing furnace, and the plurality of wound cores on the carrier are annealed in the heating chamber of the annealing furnace. In the soaking chamber, the annealing temperature is maintained and the excitation conductor is annealed in a magnetic field while the excitation conductor is energized.Furthermore, in the cooling chamber, the wound core heated to the annealing temperature is transported. The structure is such that the core is slowly cooled to room temperature while continuing to be annealed in a magnetic field, so unlike conventional methods, the wound core with the excitation coil wound thereon is put into the annealing furnace one by one and maintained at the annealing temperature. However, there is no need to perform annealing in a magnetic field for a certain period of time, and the annealing work can be carried out by continuously transporting a conveyor platform carrying multiple wound cores into the annealing furnace at a certain period of time. As a result, it is now possible to anneal a large number of wound cores at once with a uniform annealing temperature, reliably eliminating the conventional drawback of degrading magnetic properties during annealing. It can be resolved.

In addition, the present invention provides that, during magnetic field annealing, an excitation conductor that applies a magnetic field to the wound core by energization passes through windows of a plurality of wound cores mounted on a conveyance table and is transferred to the conveyance table via an insulator. On the other hand, in the soaking chamber and cooling chamber of the annealing furnace, there are lead-out conductors on both sides of the furnace walls, each of which has a fixed contact at its tip that comes into sliding contact with the excitation conductor, and the length of the conductor is the same as one conveyor table. Since it is installed in a penetrating state while maintaining the movement interval, when the conveyor table carrying multiple wound cores heated to the annealing temperature in the heating chamber is transported to the soaking chamber each time, the wound cores As a result, annealing in a magnetic field can be performed by automatically contacting the excitation conductor with a fixed contact attached to the lead-out conductor and energizing it while maintaining the excitation conductor at the annealing temperature.
There is no need to provide an excitation coil for each wound core and perform annealing in a magnetic field as in the past. Therefore,
Each time a plurality of wound cores heated to the annealing temperature are loaded onto a conveyor table and transported from the heating chamber to the soaking chamber, the excitation conductor and the fixed contact of the lead conductor are brought into automatic contact and placed in a magnetic field. By adopting a structure that performs annealing, it is possible to anneal a large number of wound cores at once.
This can be carried out efficiently and continuously without any particular need for manpower, and without impairing the magnetic properties of the core.

Furthermore, the lead-out conductor that passes through the windows of the multiple wound cores and comes into contact with the excitation conductor attached to the carrier is
Since the conveyor table is installed at a distance of one carriage from the soaking chamber to the cooling chamber of the annealing furnace, the wound core is not moved intermittently until the conveyor table moves from the soaking chamber to the cooling chamber. Since it is possible to perform annealing in a magnetic field, it is possible to improve the core properties of this type of wound core, as well as to improve the efficiency of annealing work because it is possible to annealing multiple wound cores at once in a magnetic field. It also becomes possible.

Moreover, the excitation conductor that comes into contact with the lead-out conductor only needs to be attached to the carrier by passing through the windows of the plurality of wound cores mounted on the carrier, so that the installation work is quick and easy. Since the carrier is firmly attached to the carrier via an insulator, when the carrier is moved or the lead conductor comes into contact with the fixed contact, it may cause poor contact or contact with the wound core. Mass production of wound cores made of amorphous magnetic conductive strips allows for safe and reliable annealing of wound cores, as there is no chance of them falling off and smooth and good contact can be made with fixed contacts. It is possible to provide an annealing apparatus that has various advantages that make it possible to

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of an annealing apparatus used to carry out the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is a cross-sectional view taken along line B-B in FIG. 4 is a perspective view showing the case where the wound core is annealed in a magnetic field, FIG. 5 is a time chart for explaining the operation of the present invention, and FIG. 6 is a schematic diagram for explaining the conventional annealing state. It is a diagram. A... Annealing furnace, 1... Winding core, 11... Annealing furnace body, 12... Heating chamber, 13... Soaking chamber, 14...
...Cooling room, 41... Output conductor, 42... Transport platform, 43... Fixed contact, 46... DC power supply, 4
8... Excitation conductor.

Claims (1)

[Claims] 1. A heating chamber that heats a wound core formed by winding an amorphous magnetic ribbon to a predetermined annealing temperature, a soaking chamber that maintains the wound core heated to the annealing temperature at that temperature for a predetermined time, and annealing. A cooling chamber for cooling the finished wound core to room temperature is provided, and the respective chambers are communicated with each other, and an opening/closing door is provided at the entrance side of the heating chamber and the exit side of the cooling chamber, respectively, to lower the wound core to room temperature. The annealing furnace main body is constructed so that it can be transported intermittently to each chamber, and a plurality of wound cores are mounted in the same direction on both sides of the furnace walls of the soaking chamber and the cooling chamber, and the cores are transported to each chamber intermittently. A pair of lead-out conductors connected to a DC power source are connected to each other at intervals corresponding to the movement of one conveyance table, with their tips facing each other, and are perpendicular to the moving direction of the conveyance table. furthermore, an excitation conductor is installed on the conveyance table so as to protrude toward each of the chambers in a state where the excitation conductor penetrates through the windows of the plurality of wound cores and comes into contact with the pair of lead-out conductors in a manner that can make contact with and separate from the pair of lead-out conductors; When the excitation conductor of each conveyance platform transported to the soaking room and the cooling chamber is in contact with the lead conductor placed in each chamber, a current is passed from the lead conductor to the excitation conductor and the conductor is placed on the conveyance base. An annealing device for a wound iron core, characterized in that the wound iron core is annealed in a magnetic field.