JPH0320052B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to improvements in molded permanent magnets used for example in magnetic engagement devices and magnetic medical devices. This invention relates to a molded permanent magnet that can be directly bonded without using any other special mounting tools.

(Prior Art) Conventionally, a method of adding a hard magnetic material to a hard molded material and molding the same to form a permanent magnet is generally known. In this way, if a magnet is molded using a molding material, by adjusting the amount of magnetic material added during molding, the magnetic strength of the magnet can be arbitrarily set over a wide range, and at the same time, the strength of the magnet can be adjusted. The shape and dimensions can also be formed arbitrarily.

(Problems to be Solved by the Invention) However, such conventional hard molded materials are made of ordinary plastic materials, rubber materials, etc., and have adhesive properties to the molded body, that is, the molded permanent magnet itself. Therefore, special mounting tools are required when adhering the magnet to the material to be adhered.

For example, when attaching a yoke to a magnet, as shown in FIG. Alternatively, as shown in FIGS. 7 and 8, a case 14 made of non-magnetic material such as plastic is prepared, and yokes 12,
Attach the magnet 11 to which the elastic rubber material 1 is attached.
After inserting the case claw 14' and the locking hole 1
6' and fasten with a fastening metal fitting. However, even in this case, in the former case, the appearance will be significantly impaired, and in the latter case, the magnet 11 and the yokes 12, 12
It is not possible to achieve sufficient mounting accuracy with the For example, as shown in FIG. 9, when a medical magnet 11 is attached to a mat 17, a retaining leg 20 is provided on the magnet 11 via a case 19, and the magnet 11 is attached to the mat via a back washer 21. It is attached to the fabric 18.

As described above, conventional molded magnets have a major drawback in that they require special mounting tools to adhere the magnet to the material to be adhered, which requires a great deal of cost and effort.

(Means for Solving the Problems) Therefore, an object of the present invention is to provide a molded permanent magnet that can be directly bonded to a bonded material without requiring any other engaging tools, In order to achieve this object, the molded permanent magnet of the present invention is a permanent magnet molded with a hard molded material made of a heat-melting adhesive resin material containing hard magnetic material powder, and the molded permanent magnet is heated by heating the molded material. In some cases, the adhesive resin material passes between the magnetic material powder and oozes out onto the surface of the magnet to form a molten adhesive layer. can be heat-sealed directly to the material to be adhered.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, a permanent magnet 1 is a hard molded material 2 made of a heat-melting adhesive resin material 3 such as polyamide or polyester containing fine powder 4 of a hard magnetic material such as ferrite, rare earth, or alnico. It is formed of.

When molding the magnet 2, the magnetic material powder 4 is mixed with the adhesive resin material 3 in the form of pellets or powder, and this mixture is pressed using a mold, a press, a roll, or the like.

The amount of powder 4 mixed can be increased to about 90% by weight of molded material 1 when used for strong engagement tools, etc., depending on the purpose of use.
The amount of the mixture can be determined.

When bonding the molded permanent magnet 1 to the bonded material 5, the bonding surface of the magnet 1 is first heated. In this case, the adhesive surface of the magnet 1 is the second
As shown in the figure, it is formed of a part B where the heat-melting adhesive resin material 3 is exposed and a part A where the surface of the magnetic material powder 4 is extremely thinly coated with the resin material 3. Then, as shown in Figure 3,
In the portion A, the resin material 3 passes through the powder 4 and oozes out onto the surface, and is dissolved together with the resin material 3 in the portion B to form an adhesive layer C. here,
When the content of the powder 4 is large, the proportion of the portion A becomes extremely high, but even in this case, since the powder 4 is thin as described above, the resin material 3 is uniformly oozed out through the spaces between the powders 4. Therefore, a uniform adhesive layer c is formed over the entire adhesive surface of the magnet 1.

Next, when the magnet 1 is pressed against the material 5 to be adhered in this state, the magnet 1 is easily adhered to the material 5 to be adhered.

Here, since the adhesive surfaces are firmly adhered over the entire surface, the magnetic properties of the magnet are not adversely affected. Moreover, since the adhesive resin material 3 has extremely good adhesive properties, it can be reliably bonded to metals, fabrics, etc., as well as plastics, leather, and other materials.

That is, for example, as shown in FIG. 4, the aforementioned yokes 12, 12 can be easily and precisely adhered directly to the magnet 1 without using any attachment tools, and as shown in FIG. Similarly, the magnet 1 can be directly bonded to the magnet 1 without using any mounting tools. Similarly, it goes without saying that it can be easily adhered to, for example, leather bags or walls made of colored materials.

(Effects of the Invention) As explained above, in the molded permanent magnet of the present invention, the molding material is formed of a heat-melting adhesive resin material, and when the molding material is heated, the adhesive resin material is not contained in the molding material. The structure is such that the melted adhesive layer is formed by passing between the magnetic material powder and forming a molten adhesive layer on the surface of the magnet. This has the advantage that it can be directly bonded to the material to be bonded through the adhesive. Furthermore, since the adhesive resin material has extremely good adhesive properties, it can be extremely easily adhered to any material to be adhered. Therefore, there is also no need for any mounting tools that were conventionally required, resulting in a significant reduction in cost and installation effort.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of one embodiment of the molded permanent magnet of the present invention, Fig. 2 is an enlarged view of part A in Fig. 1, showing the state when not heated, and Fig. 3 similarly shows the state when heated. show. 4 and 5 are explanatory diagrams showing an example of the adhesion state of the magnet 1 of the present invention, and FIGS. 6 to 9 are illustrations of the conventional magnet 1.
FIG. 1 is an explanatory diagram showing an example of the adhesive state of No. 1; 1... Molded permanent magnet, 2... Hard molded material, 3...
...Heat-melting adhesive resin material, 4...Hard magnetic material powder,
5...Adhesive material, c...Adhesive layer.

Claims (1)

[Claims] 1 A permanent magnet molded from a hard molded material made of a heat-melting adhesive resin material containing hard magnetic material powder, wherein when the molded material is heated, the adhesive resin material passes between the magnetic material powders. A molded permanent magnet, characterized in that a molten adhesive layer is formed on the surface of the magnet.