JPH09320831A - Composite magnetic mateiral and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent uneven coating of paste and untying of textiles of a mesh- like support body, and enable large-quantity processing, by causing the cutting direction to be equal to the bias direction of the mesh-like support body in cutting a composite magnetic body. SOLUTION: A mesh-like support body 2 is made of stainless steel, and insulating composite magnetic material layers 3 are molded in a sheet form by a doctor blade molding method. The mesh-like support body 2 is sandwiched between the insulating composite magnetic material layers 3, thus stacking the support body and the composite magnetic material layers. The stacked material is hot pressed and hardened by heating, thus forming a single composite magnetic body 1. This composite magnetic body 1 is cut into the bias direction of the mesh-like support body 2. Alternatively, a polyethylene mesh is used as the mesh-like support body 2, and a paste formed by dispersing soft magnetic powder into an organic vehicle is applied in the bias direction of the mesh-like support body 2, thus forming the insulating composite magnetic material layer 3. This is hardened by heating to form the composite magnetic material 1, and is cut into the bias direction of the mesh-like support body 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a composite magnetic body for suppressing radiation noise for preventing electromagnetic interference and a composite magnetic body obtained by the production method.

[0002]

2. Description of the Related Art A composite magnetic body for suppressing radiation noise shown in FIG. 4 is one of the embodiments of the composite magnetic body previously proposed by the applicant of the present application in Japanese Patent Application No. 7-183911. Figure 4 (a)
Shows a plan view of the mesh-shaped support, and FIG. 4 (b) shows a cross-sectional view of a composite magnetic body obtained by applying a paste in which a soft magnetic powder is dispersed in an organic vehicle.

As shown in FIG. 4, in manufacturing the composite magnetic body 1 for suppressing radiation noise, a paste 4 in which a soft magnetic substance powder is dispersed in an organic vehicle is applied to a sheet of a large mesh-shaped support 2 by a spatula. After coating with a roller or roller, it was heat-cured and cut to the required dimensions.

At this time, the coating and cutting directions were along the warp or weft of the mesh-shaped support 2 as shown by arrows A and B in FIG.

[0005]

According to this method, since the paste 4 is applied to the mesh-shaped support 2 along the direction of the yarn, uneven coating is likely to occur when the mesh has a coarse mesh. Furthermore, as a major problem, since the yarn is cut along the yarn direction, the yarn is unraveled at the end of the yarn, and it takes a long time to process the end face, and a defect such as a defect occurs.

A technical object of the present invention is to provide a method for producing a composite magnetic body and a composite magnetic body which can be processed in a large amount without uneven coating of a paste to be an insulating composite magnetic body layer or fraying of threads of a mesh-shaped support. Is to provide.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above problems by setting the coating direction and the cutting direction to the bias direction of the mesh support. According to this method, since it suffices to change the installation direction of the mesh-shaped support, it is possible to process a large amount as in the conventional case without increasing the cost.

That is, the present invention is characterized in that when the composite magnetic body composed of the insulating composite magnetic material layer and the mesh-shaped support is cut, the cutting direction is the bias direction of the mesh-shaped support. And a method for producing a composite magnetic body.

According to the present invention, in a method for producing a composite magnetic body composed of an insulating composite magnetic body layer and a mesh-shaped support, a paste obtained by mixing a soft magnetic powder to be the insulating composite magnetic body layer and an organic vehicle. Is applied in the bias direction of the mesh-shaped support, which is a method for producing a composite magnetic body.

The present invention is a method for producing a composite magnetic body composed of an insulating composite magnetic material layer and a mesh-shaped support, in which a soft magnetic powder for the insulating composite magnetic material layer and an organic vehicle are mixed. In the method for producing a composite magnetic body, the cutting direction of the composite magnetic body formed by applying the paste in the bias direction of the mesh support is set as the bias direction of the mesh support.

The present invention is a composite magnetic body produced by the above method for producing a composite magnetic body.

The present invention is the composite magnetic body produced by the above method for producing a composite magnetic body, characterized in that the soft magnetic powder has an oxide film on its surface.

The present invention is the composite magnetic body produced by the above method for producing a composite magnetic body, wherein the soft magnetic powder is flat or acicular.

The present invention is the composite magnetic body produced by the above method for producing a composite magnetic body, wherein the mesh-shaped support is an electric conductor.

The present invention is the composite magnetic body produced by the above-mentioned method for producing a composite magnetic body, wherein the mesh-shaped support is an insulator coated with a conductive material.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, according to the first embodiment of the present invention, the mesh-shaped support 2 is made of stainless steel, and the insulative composite magnetic layer 3 is formed into a sheet by a doctor blade forming method to form a mesh. The substrate 2 is sandwiched and laminated. This is hot-pressed and then heat-cured to 1
A composite magnetic body 1 is formed. This composite magnetic body 1 is cut in the bias direction of the mesh-shaped support 2 to have a predetermined size, and an end surface treatment is performed to obtain a product.

As shown in FIG. 2, the second embodiment of the present invention is a composite magnetic layer 3 molded into a sheet with a predetermined size.
And a stainless steel mesh-shaped support 2 cut in advance in a bias direction with a size slightly smaller than that of the composite magnetic layer 3, sandwiched, laminated and hot-pressed.
Heat cure to obtain the product.

As shown in FIG. 3, in the third embodiment of the present invention, a polyethylene-based mesh is used for the mesh-shaped support 2, and a paste 4 in which a soft magnetic powder is dispersed in an organic vehicle is applied. Insulating composite magnetic layer 3
It is a method of forming. The coating direction at this time is the bias direction of the mesh-shaped support 2 indicated by the arrow C. This is heat-cured to form the composite magnetic body 1, which is cut in the bias direction of the mesh-shaped support body 2 to have a predetermined size, and an end surface treatment is performed to obtain a product.

[0020]

Embodiments of the present invention will be described below.

(Example 1) This example is based on the above-described first embodiment. In the mesh-shaped support 2,
# 120 SUS316 1000 × 2000 × 1 mm
The stainless-steel mesh-like support of was used. As the insulative composite magnetic material layer 3, the one having the composition shown in Table 1 and having a thickness of 0.5 mm was formed into a sheet by a doctor blade forming method. The soft magnetic powder used here has an oxide film layer formed on its surface by annealing.

[0022]

As shown in FIG. 1, the mesh-like support 2 is sandwiched and laminated with two sheets of the above-mentioned insulating composite magnetic material layer 3, hot-pressed at 85 ° C., and heat-cured at 70 ° C. for 48 hours. It was The composite magnetic body 1 thus formed is 100 ×
The product is cut into a size of 100 × 1 mm in a direction of arrow D and arrow E, which is the bias direction of the mesh-shaped support 2, with a punching press machine, and then a resin coating for end face protection is performed to perform end face treatment to obtain a product. Obtained.

The stump before the end face treatment is shown in FIG. Since the cross section of the thread (stainless steel in this embodiment) of the mesh-shaped support 2 is always present at the stump, unlike the conventional example shown in FIG. 4, fraying does not occur.

Example 2 This example is based on the above-described second embodiment. It is preferable in terms of cost and man-hours to make and cut a large sheet as in Example 1 in that a large amount can be treated at one time, but stacking is performed using a support body cut in a bias direction with a predetermined size. However, a method of obtaining a composite magnetic body having a predetermined size from the beginning may be adopted. The present embodiment uses such a method.

When this method is adopted, as shown in FIG. 2, the dimension of the mesh-shaped support 2 is slightly reduced with respect to the dimension of the insulative composite magnetic layer 3, so that the end face treatment can be omitted. it can. Specifically, the mesh-shaped support 2
And the size of the insulator composite magnetic layer 3 is 100 × 100. Other configurations and processes are the same as those in Example 1, and the cutting process and the end face processing process are omitted.

According to this method, as in Example 1, even when the mesh-shaped support is cut in the bias direction into a large size and the cutting and the end surface treatment are performed, when the support alone is viewed, Needless to say, it is effective because no fraying occurs.

Example 3 This example is based on the above-described third embodiment. As shown in FIG. 3, the mesh-shaped support 2 has # 100 of 1000 × 1000 × 1 m.
m polyethylene mesh support 2 was used. or,
Paste 4 has the composition shown in Table 2. The soft magnetic material powder contained in the paste 4 used in this example has an oxide film formed by annealing on its surface and is in a flat shape.

[0029]

This paste 4 was applied several times to both sides of the mesh-shaped support 2 with the direction of arrow C, which is the bias direction of the mesh-shaped support 2, as the application direction, to form the insulative composite magnetic layer 3.

According to the conventional method, coating unevenness such as thin coating on the warp threads and thick coating immediately after the weft threads was likely to occur, but in the present example, no coating unevenness was observed. The thickness of one layer at the time of coating is about 0.1 mm, each layer is dried, and when sufficiently dried, the steps of pressing and re-coating are repeated and laminated. It was cured by heating for 48 hours.

50 × 50 of the composite magnetic body 1 thus produced
mm in the bias direction of the mesh-shaped support 2 was cut by a punching press machine, a resin coating for protecting the end face was applied, and the end face was treated to obtain a product.

Even when the insulating composite magnetic layer is obtained by coating as in this example, as shown in Example 2, a support previously cut in the bias direction is used, and the support is formed thereon. Similarly, the method of applying may be used.

Example 4 In this example, a # 140 polyethylene mesh coated with copper was used as the mesh-shaped support. Other parts are the same as those in the first embodiment. By forming the support with a resin, the weight of the product can be reduced, and a product which does not impair the shielding effect obtained with the stainless mesh due to the copper coating on the surface was obtained.

As described above, in the first to fourth embodiments,
Both of them show the structure in which the insulating soft magnetic material layers are formed on both sides of the mesh-shaped support, but the present invention can be applied even if it is formed on only one surface. Furthermore, in the examples, a relatively thin sheet has been described, but even if the thickness of the composite magnetic body increases, the same effect can be obtained, and there is no restriction on the thickness at all. Needless to say, the composition, the composition of materials, the size / shape, and the means can be applied to those other than those described here.

[0036]

EFFECTS OF THE INVENTION The present invention eliminates uneven coating and eliminates fraying of the mesh.
It was possible to provide a method for producing a composite magnetic body and a composite magnetic body with excellent work efficiency.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a composite magnetic body according to a first embodiment of the present invention.
FIG. 1A is an exploded perspective view. FIG. 1B is a sectional view.

FIG. 2 is an explanatory diagram of a composite magnetic body according to a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of a composite magnetic body according to a third embodiment of the present invention.

FIG. 4 is an explanatory view of a conventional composite magnetic body. FIG. 4A is a plan view of the mesh-shaped support. FIG. 4B is a sectional view of the composite magnetic body.

[Explanation of symbols]

 1 composite magnetic body 2 mesh support 3 (insulating) composite magnetic body layer 4 paste 5 squeegee 6 guide A, B, C, D, E arrow

Claims (8)

[Claims] 1. When cutting a composite magnetic body composed of an insulating composite magnetic body layer and a mesh-shaped support, the cutting direction is the bias direction of the mesh-shaped support. Manufacturing method. 2. A method for producing a composite magnetic body composed of an insulating composite magnetic material layer and a mesh-shaped support, wherein a paste prepared by mixing a soft magnetic material powder to be the insulating composite magnetic material layer and an organic vehicle is used. A method for producing a composite magnetic body, which comprises applying the mesh-shaped support in the bias direction. 3. A method of manufacturing a composite magnetic body composed of an insulating composite magnetic material layer and a mesh-shaped support, wherein a paste obtained by mixing soft magnetic powder to be the insulating composite magnetic material layer and an organic vehicle is used. A method for manufacturing a composite magnetic body, wherein a cutting direction of the composite magnetic body applied in the bias direction of the mesh-shaped support is set to a bias direction of the mesh-shaped support. 4. A composite magnetic body manufactured by the manufacturing method according to claim 1. 5. The composite magnetic body according to claim 4, wherein the soft magnetic powder has an oxide film on its surface. 6. The composite magnetic body according to claim 4, wherein the soft magnetic powder is flat or needle-shaped. 7. The composite magnetic body according to claim 4, wherein the mesh-shaped support is a conductor. 8. The composite magnetic body according to claim 4, wherein the mesh-like support is an insulator coated with a conductive material.