JPH05114525A - Manufacture of amorphous iron core - Google Patents

Abstract

PURPOSE:To obtain the manufacturing method of an amorphous iron core excellent in magnetic characteristics wherein irregularities are small. CONSTITUTION:The outer periphery of an iron core 1 formed by winding an amorphous thin belt is held by a shape maintaining member 2 composed of a silicon steel plate. A molding jig 3 consists of an inner frame 4 and an outer frame 5, and the rectangular inner frame 4 is mounted on the inner peripheral part of the iron core 1 in a preceding process. While the outer frame 5 is moved along the arrow direction in the above state, the lamination thickness is adjusted, and the space factor of the iron core 1 is kept in a specified range. In the next magnetic field anealing process, the iron core 1 is maintained in the final shape by the molding jig 3, and subjected to heat treatment at 320-360 deg.C, while a magnetic field in the range of 600-1600A/m is applied in the magnetic path direction. Thereby an amorphous iron core of low iron loss is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an amorphous iron core.

[0002]

2. Description of the Related Art It is generally known that when an amorphous magnetic material is used for an iron core, iron loss can be significantly reduced as compared with an iron core using a silicon steel plate. Therefore, the practical application of an iron core using an amorphous magnetic material has been studied.

Conventionally, as a method of using an amorphous material as an iron core, a thin body made of an amorphous material is wound around a core and laminated, and a part thereof is cut in the width direction to have a thickness of 0.1 to 0.1 in the lamination direction. A method of forming a 3 mm laminated block, winding the laminated block around a forming core or die, laminating, forming the final shape of the iron core, and performing magnetic field annealing while maintaining the iron core is studied. There is. It is known that the characteristics of the amorphous material are that the magnetic characteristics are changed by stress and that the magnetic characteristics are remarkably improved by the magnetic field annealing. The magnetic field annealing conditions are, for example, 380 ° C. for 2 hours and an applied magnetic field of 800 A / m.
It is done in.

[0004]

However, in the conventional manufacturing method, although it is possible to manufacture an iron core using an amorphous material, there is a problem that the magnetic characteristics vary widely.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a method for producing an amorphous iron core having excellent magnetic characteristics and less variation.

[0006]

In order to achieve the above object, the present invention provides a forming step of forming an iron core formed by rolling or stacking amorphous thin films into a final shape by a forming jig, and heat treating the iron core. And a magnetic field annealing step to
In the forming step, the space factor of the iron core is maintained between 0.80 and 0.88, and in the magnetic field annealing step, the iron core is moved in the magnetic path direction from 600 to 1600A.
The heat treatment is performed at 320 to 360 ° C. while applying a magnetic field of / m.

[0007]

In the above method, by keeping the space factor of the iron core between 0.80 and 0.88 in the forming step, it is possible to suppress the increase of iron loss due to the contact between the laminated bodies and reduce the variation, and 600 to 1600 in annealing process
Magnetic properties can be improved by heat treatment at 320 to 360 ° C. while applying a magnetic field of A / m.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows the molding process,
An iron core 1 formed by winding an amorphous thin body has its outer periphery held by a shape maintaining material 2 made of a silicon steel plate or the like.
The molding jig 3 is composed of an inner frame 4 and an outer frame 5. The rectangular inner frame 4 is mounted on the inner peripheral portion of the iron core 1 in the previous step, and the outer frame 5 is stacked in this state while moving in the direction of the arrow. By adjusting the thickness, the space factor of the iron core 1 is maintained within a specific range. Next, in the magnetic field annealing step, the iron core 1 is held in the final shape by the molding jig 3 and the iron core 1 is 600 to 1 in the magnetic path direction.
320 to 360 ° C while applying a magnetic field of 600 A / m
Heat treatment. Then, the inner frame 4 and the outer frame 5 are removed, and as shown in FIG. 2, a bobbin 6 having the same size as the inner frame 4 is provided on the inner peripheral portion of the iron core 1.
And the shape maintaining material 2 is attached to the outer peripheral portion of the iron core 1.

FIG. 3 shows a manufacturing process of the iron core 1 in the pre-process of the molding process. In FIG. 3 (a), the outer diameter is 150φ.
Amorphous thin body (thickness 25μ
m, width 170 mm) to a thickness of about 40 mm and fixed with a clamp 7, then the core is removed, a part of the laminate 1a is cut in the width direction, and an adhesive 8 is applied to the cut surface to cure. Then, the clamp 7 is removed. Next, in (b), the laminated body 1a is
It is divided into m-thick blocks, and the dimension A between the end faces is 15 mm.
They are shifted one by one and bundled with the tape 9 to form a plurality of blocks 10. Further, (c) shows a round roll forming step, in which a block 10 having a short magnetic path length is formed on a circular frame forming core 11 whose weight has been measured in advance.
Further, the layers are wound and laminated so that the cut portions abut against each other while pulling so as not to loosen. At this time, the circular core forming core 1
1 is preferably circular, and the abutting portion of the cutting portion is preferably within a certain angle range. Then, the shape maintaining material 2 is wound around the outermost circumference. At this time, the weight of the shape maintaining material 2 is measured in advance. Further, after the completion of the lamination, the total weight is measured, and the weights of the circular core 11 and the shape maintaining material 2 are subtracted to obtain the weight of the iron core 1. The apparent volume is obtained from the inner diameter, outer diameter, and width of the iron core 1, and the apparent volume is multiplied by the true specific gravity of the amorphous material to obtain the weight when the space factor is 100%. The space factor of the iron core 1 is calculated by dividing the weight of the iron core 1 obtained earlier by the weight when the space factor is 100%, and it is confirmed that the space factor is between 0.8 and 0.88. If it does not enter, the layer is laminated and wound again to adjust the space factor, and the apparent layer thickness at this time is determined. Then, after the completion of the round winding, the round forming core 11 is removed, and the rectangular inner frame 4 is inserted into the inner peripheral portion of the iron core 1 as shown in FIG.
The iron core 1 and the molding jig 3 are assembled by adjusting the shape. A plurality of iron cores 1 were heat-treated under the conditions of a temperature of 300 to 380 ° C. and an applied magnetic field of 800 A / m in a nitrogen gas atmosphere by the above method, and the characteristics of the temperature-iron loss relative value at that time are shown in FIG. Here, the iron loss is 380 ° C and the magnetic field is 800A.
The iron loss when heat-treated at / m is set to 100 for relative display. Further, sample cores having different space factors are prepared by the same method as described above, and these sample cores are heat-treated at a temperature of 330 ° C. while applying a magnetic field of 800 A / m. The measurement result of the iron core 1 obtained here is shown in FIG.
It is clear that the iron loss depends on the space factor even when heat-treated under the same conditions, and the same effect was confirmed even when the magnetic field during heat-treatment was changed between 600 and 1600 A / m.

As described above, according to the manufacturing method of the embodiment, the iron core 1
By keeping the space factor of between 0.80 and 0.88, it is possible to suppress an increase in iron loss due to the contact between the laminated bodies 1a and reduce the variation, and it is possible to obtain 600 to 1600 A / m.
The magnetic characteristics can be improved by performing heat treatment at 320 to 360 ° C. while applying the magnetic field.

Although the structure of the abutting portion of the iron core 1 is a step lap structure in the embodiment, it is not limited to this structure and may be another structure.

[0012]

As is apparent from the above embodiments, the method for producing an amorphous iron core of the present invention comprises a forming step of forming an iron core formed by rolling or stacking amorphous thin bodies into a final shape by a forming jig, and A magnetic field annealing step of heat-treating the iron core, wherein the space factor of the iron core is maintained between 0.80 and 0.88 in the forming step, and the iron core is moved in the magnetic path direction by 600 in the magnetic field annealing step.
The heat treatment is performed at 320 to 360 ° C. while applying a magnetic field of 1 to 1600 A / m. By this manufacturing method, an iron core having excellent magnetic characteristics and less variation can be obtained.

[Brief description of drawings]

FIG. 1 is a front view of a forming process in a method for manufacturing an amorphous iron core according to an embodiment of the present invention.

FIG. 2 is a front view of the amorphous iron core.

3 (a), (b) and (c) are process diagrams of the method for manufacturing the same amorphous iron core.

FIG. 4 is a characteristic diagram of an iron core produced by the method for producing the amorphous iron core.

FIG. 5 is a characteristic diagram of an iron core manufactured by the same method for manufacturing an amorphous iron core.

[Explanation of symbols]

 1 Iron core 3 Forming jig

Front page continuation (72) Inventor Hiromitsu Hara 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A forming step of forming an iron core formed by rolling or laminating an amorphous thin body into a final shape by a forming jig, and a magnetic field annealing step of heat-treating the iron core,
In the forming step, the space factor of the iron core is kept between 0.80 and 0.88, and in the magnetic field annealing step, the iron core is moved in the magnetic path direction from 600 to 1600A.
A method of manufacturing an amorphous iron core, in which a heat treatment is performed at 320 to 360 ° C. while applying a magnetic field of / m.