JP2998342B2 - Manufacturing method of magnetic core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic core obtained by winding an amorphous alloy ribbon.

[0002]

2. Description of the Related Art In a manufacturing process of a magnetic core of this type, a plate made of an amorphous alloy is cut into slits to obtain a magnetic ribbon, and the magnetic ribbon is wound a predetermined number of times to obtain a magnetic core body. Thereafter, the core body is subjected to a heat treatment to control the magnetic permeability so as to have a constant characteristic, and the core body is impregnated with an epoxy resin, a silicone resin, etc., and is cured. Was cut to form a gap to obtain a desired magnetic core.

[0003]

By the way, in the magnetic core thus obtained, various methods such as a method of winding a magnetic ribbon, an improvement in heat treatment conditions, and the like are used to suppress variations in magnetic characteristics such as iron loss. Attempts have been made, but none of them has been able to provide a sufficient effect.

Under such circumstances, the present inventor has repeatedly found that, by repeating various trials and errors, it is possible to improve the magnetic characteristics of the magnetic core by applying a pressing force to the magnetic core body from the outside. . Further, the direction, conditions, and the like of the pressing force were examined.

An object of the present invention is to provide a technique capable of improving magnetic characteristics of a magnetic core and suppressing variation in quality.

[0006]

A first gist of the present invention is as follows.
After winding the amorphous alloy ribbon into a predetermined shape to obtain a core body, a force is applied to the core to deform the core body in the range of 1% to 50% of the diameter of the core body (the 1
Variants), and then settling to return the magnetic center body to the outer diameter of Ryakumoto
Shape (second deformation).

[0007] The second gist is that the first deformation is performed by the magnetic core.
The pressed and deformed from a predetermined direction of the body, the second variant, before
Pressing the magnetic core body from a direction different from the predetermined direction.
To shape the magnetic core body . The third gist is that the second deformation is pressed during the first pressing deformation.
The core body from outside the diameter perpendicular to the diameter
The magnetic core body is thereby shaped .

A fourth gist is that a heat treatment is performed prior to the deformation processing. The fifth gist is that a core body in which the volume shrinkage of the amorphous alloy ribbon is 0.15% or more as a result of heat treatment is used to reduce the diameter of the core body from the outside of the diameter of the core body during cooling or cooling. After pressing and deforming the magnetic core main body in the range of 1% to 50%, by pressing the magnetic core main body from the outer diameter crossing the diameter pressed at the time of the pressing deformation until the magnetic core main body returns to the substantially original outer diameter , The magnetic core body is shaped .

In the present invention, the amorphous alloy ribbon is
It refers to an amorphous alloy processed into a ribbon shape. As the amorphous alloy, for example, an Fe-based amorphous alloy (Fe in the alloy)
Is an Fe-based amorphous alloy having a content of at least 50 atomic%).
e-B, Fe-BC, Fe-B-Si, Fe-BS
i-C, Fe-B-Si-Cr, Fe-Co-BS
i, Fe-Ni-Mo-B and the like.

[0010] Particularly preferred Fe-based amorphous alloy in this, it may be exemplified _{Fe X Si Y B Z M W} . Where X = 5
0 to 85, Y = 1 to 15, and Z = 5 to 25 (X, Y, and Z all represent atomic%). M is Co,
Ni, Nb, Ta, Mo, W, Zr, Cu, Cr, M
An element composed of one or a combination of two or more of n, C, Al, P and the like, wherein W = 0 to 5 atomic% can be exemplified.

According to the present invention, such an amorphous alloy ribbon is wound to obtain a magnetic core body, and the magnetic core body is deformed (first deformation). Next, the core body is deformed until it returns to the substantially original outer diameter.
Shaping the (second variant).

In the first and second deformation processes,
The method of deformation is not particularly limited.In addition to pressing deformation from outside the diameter of the core body, deformation applying a tensile force from inside to outside of the diameter of the core body, deformation from the hollow portion of the core body to the outer peripheral direction of the core body. Any deformation processing such as a deformation for adding a pushing force may be performed.

The term "until returning to substantially the original outer diameter" is a concept including not only the case where the magnetic core completely becomes the original outer diameter but also the time until the magnetic core returns to the shape approximate to the original outer diameter. . In particular,
For example, after a pressing force is applied from the outside of the diameter of the core body toward the center of the core body to deform the core body so as to be crushed from the outside of the diameter (first deformation), the diametric direction to which the pressing force is applied is changed. Alternatively, a pressing force may be applied from the outside of the diameter perpendicular to the core (second deformation) to return to the original shape of the magnetic core body.

In both the first and second modifications, a tensile force may be applied to the outside of the diameter of the magnetic core body. Further, in the first and second modifications, a pushing force may be applied from the hollow portion of the magnetic core body to the outer periphery of the magnetic core body to deform the magnetic core body so as to expand to a specific outward direction.

In the second deformation, it is not necessary to deform the magnetic core body until it returns to the original outer diameter. In particular, in the case of a magnetic core main body in which winding unevenness or the like occurs and the cross section is a distorted circle, it is possible to shape the appearance through the first deformation processing and the second deformation processing.

In the heat treatment prior to the deformation treatment of the magnetic core body, it is important to control the temperature range so that the volume shrinkage of the magnetic core body becomes 0.15% or more, and then to perform the deformation treatment to greatly improve the iron loss improvement rate. It has been found by the present inventor that the effect can be improved to a large extent.

Further, when such a heat treatment is performed, the pressing deformation can be performed at the time of cooling down or cooling down the core body. Here, the cooling of the magnetic core body may be room temperature cooling or forced cooling.

Here, the volume shrinkage refers to a volume shrinkage based on measurement by a thermomechanical analyzer (TMA). This heat treatment atmosphere may be in the air, but preferably by using an inert atmosphere such as a nitrogen atmosphere, it is also possible to prevent the Kapton tape used for stopping the end of the amorphous ribbon from peeling off. it can.

[0019]

According to the present invention, the application of a pressing force to the magnetic core body from the outside alleviates the stress ubiquity in the magnetic core body, so that magnetic properties such as iron loss are remarkably improved and quality is improved. Can be suppressed.

[0020]

Embodiments of the present invention will be described below. Allied amorphous alloy ribbon (Product name: Metgla
s, product number: 2605S-2, composition: Fe ₇₈ B ₁₃ Si
₉ (atomic%), a thickness of 21 μm, and a width of 10 mm) were wound using the winding device shown in FIG.

In FIG. 1, a roll 3 for supplying a ribbon 1 is provided, and a ribbon fed from the roll 3 is provided with a ribbon thickness measuring device 11 and a tension detecting roll 4.
The ribbon is supplied to the winding core 6 via the cutter 5 and the ribbon feeding device 9.

Outer diameter 2 obtained by the winding device
A toroidal magnetic core body 12 having a diameter of 5 mm and an inner diameter of 15 mm was placed in an electric furnace at each temperature shown in Table 1 (experimental example).
Annealed (heat treated) for a time.

Next, the core body was pressed and deformed as shown in FIG. 1 while cooling it at room temperature. First, as a first pressing deformation, as shown in FIG.
A pressing force is applied from the outside of the diameter (H direction and -H direction) toward the center direction of the magnetic core 2 so that the diameter l of the magnetic core body 12 becomes about 90% as shown in FIG. Compress horizontally.

Next, as a second pressing deformation, FIG.
As shown in (c), a pressing force is applied from outside the diameter (V direction and -V direction) orthogonal to the diameter in the pressing direction (H, -H), and as shown in FIG. Until it returns to its original diameter l.

The magnetic core body 12 thus obtained was housed in a container to obtain a magnetic core. Table 1 below shows a comparison of the heat treatment time, the volume shrinkage rate, and the iron loss improvement rate of the magnetic core obtained as described above.

In Table 1 below, the volume shrinkage was determined by TMA by measuring the shrinkage before and after the heat treatment of the amorphous ribbon. The iron loss improvement rate W is defined as Wf, the iron loss before the pressing deformation, and W iron as the iron loss after the pressing deformation.
As a, W (%) = {(Wf−Wa) / Wf} × 10
0 was obtained from the equation.

The iron loss was measured using a "BH analyzer" (model: SY-8216) manufactured by Iwasaki Tsushinki Co., Ltd. at a frequency of 100 kHz and a magnetic flux sine wave of 0.1T.

According to this embodiment, for example, at 450.degree.
In the case of performing the heat treatment for a long time (an experimental example in Table 1)
While the iron loss before the pressing deformation was 89 W / kg, the iron loss after the pressing deformation was 40 W / kg, and an improvement rate of 55% of the iron loss before and after the pressing deformation was obtained.

[0029]

[Table 1]

[0030]

[Comparative Example] An Allied amorphous alloy ribbon (product name: Metglas, product number: 2605S-) as in the above example.
2. Composition: Fe ₇₈ B ₁₃ Si ₉ (atomic%), thickness 21μ
m and a width of 10 mm) using the winding device shown in FIG. 2 to obtain a magnetic core body 12 having the same outer shape as that of the embodiment, under the same temperature conditions as those of the embodiment (processing temperature: 450 ° C. for 2 hours). After the heat treatment, the core was housed in a container without performing the pressing deformation treatment described in the examples. Table 1 shows the iron loss improvement rates at this time.

As described above, the experimental examples, which are the examples,
As is clear from the comparison between the example and the comparative example, it was possible to improve the iron loss characteristics by performing the pressing deformation of the example.
Further, as is clear from Table 1, such an iron loss improvement ratio was particularly remarkable when the volume shrinkage ratio was 0.15% or more.

[0032]

According to the present invention, the magnetic properties such as iron loss of the magnetic core are improved by subjecting the magnetic core body to the pressing deformation processing.
Variations in quality can be suppressed, and a highly reliable magnetic core can be obtained.

[Brief description of the drawings]

FIGS. 1A to 1C are explanatory views showing a pressing deformation process of a magnetic core main body according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a winding device for obtaining a magnetic core body of the present invention.

[Explanation of symbols]

 1. Ribbon 3. Roll 4. Tension detection roll 5. Cutter 6. Core 9. Ribbon feeding device 11. Ribbon thickness measuring device 12. Magnetic core body

Claims (5)

(57) [Claims] 1. After winding an amorphous alloy ribbon into a predetermined shape to obtain a magnetic core body, a force is applied to the magnetic core body from a predetermined direction.
By adding 1% to 50% of the diameter of the magnetic core body.
After deforming the magnetic center body at% range, and the predetermined direction is
By applying a force to the magnetic core main body from another direction, the manufacturing method of the magnetic core, characterized by shaping to return the magnetic center body to the outer diameter of Ryakumoto. 2. After winding an amorphous alloy ribbon into a predetermined shape to obtain a magnetic core body, 1% to 5% of the diameter of the magnetic core body is obtained.
After the core body is pressed and deformed from a predetermined direction in a range of 0%, the core body is pressed from a direction different from the predetermined direction.
By doing so, the magnetic core body is shaped until it returns to the substantially original outer diameter .
Method for producing a magnetic core, characterized in that that. 3. After winding an amorphous alloy ribbon into a predetermined shape to obtain a core body, the core body is pressed from outside the diameter of the core body in a range of 1% to 50% of the diameter. After the deformation, the magnetic core body is pressed from outside the diameter orthogonal to the diameter pressed at the time of the pressing deformation until the magnetic core body returns to the substantially original outer diameter .
The method for manufacturing a magnetic core, comprising: shaping the magnetic core main body . 4. The method for manufacturing a magnetic core according to claim 1, wherein the magnetic core body is heat-treated before the deformation. 5. After winding an amorphous alloy ribbon into a predetermined shape to obtain a magnetic core body, heat treatment is performed to increase the volume shrinkage of the amorphous alloy ribbon to 0.15% or more. in the magnetic core main body, after pressing deformed magnetic center body in the range of 1% to 50% of the diameter outward said diameter than in the core body during Funetsu or during cooling, exchange in the pressed diameter during the pressing deformation
A method for manufacturing a magnetic core , wherein the magnetic core body is shaped by pressing the magnetic core body from the outside of the diameter until the magnetic core body returns to the substantially original outer diameter.