JPS6028092Y2 - magnetic chuck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic chuck, and more particularly, to a magnetic chuck used for magnetically coupling and fixing a workpiece or workpiece made of a magnetic material.

As is well known, a magnetic chuck uses a magnet to magnetically couple and fix a workpiece or workpiece made of a magnetic material by the magnetic force generated from the magnetic pole of the magnet.
Conventionally, when not in use, the magnetic poles of the magnet are magnetically open, so if the magnet is repeatedly used and not used, the internal magnetic field of the magnet is disturbed and its magnetic force decreases. there were.

In addition, a magnetic substance is attracted to the magnetic pole surface of the magnet, and this magnetic substance forms the attraction surface of the magnetic chuck, but a gap occurs or exists between the magnetic pole surface and the magnetic body. This caused the magnetic force of the magnet to decrease.

This is because the magnetic pole surface of the magnet and the surface of the magnetic material that form the coupling surface are not necessarily completely parallel and flat surfaces. In a magnetic chuck having a structure in which a plurality of magnets are interposed at appropriate intervals, for example, since it is difficult to make each of the magnets have exactly the same thickness, it is difficult to make the thickness of each magnet the same as the magnetic material. This occurs because a gap is formed between the two surfaces of the adsorption bond.

Furthermore, the workpieces and workpieces that are magnetically coupled and fixed by magnetic chucks are made of ferromagnetic materials such as iron-based alloys and have relatively high hardness, so magnetic chucks are not used for these. If this occurs, the surface of the magnetic chuck may be damaged or worn out.

In order to eliminate the above-mentioned conventional drawbacks, the purpose of the present invention is to form a demagnetization prevention part between both magnetic poles of each magnet. By bonding through an intervening material such as an adhesive with magnetic permeability, demagnetization of the magnet is prevented, and by coating the surface of the magnetic chuck with a wear-resistant, high-hardness material, wear resistance, An object of the present invention is to provide a magnetic chuck having corrosion resistance.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

The magnetic chuck of the present invention shown in the figure is formed in five layers, and the outermost upper and lower layers 1 and 2 and the layer 3 disposed in the middle are formed of an iron plate or other iron-based ferromagnetic material.

And these magnetic materials 1. 2. A layer consisting of non-magnetic materials 4 and 5 is formed between the non-magnetic materials 4 and 5 by injection solidification in the final stage, and a plurality of permanent magnets 6 are placed inside these non-magnetic materials 4 and 5 at appropriate intervals. It is distributed and interposed.

Around the side surfaces of each magnet 6, that is, the magnet 6 and the non-magnetic material 4 or 5
A cylindrical layer of a demagnetization prevention part 7 made of a weak or semi-magnetic material is formed between the S and N pole faces of each magnet and the magnetic material 1.
.

Further, at least the chuck adsorption surface of the magnetic chuck shown in this figure, and if necessary, the entire surface is coated with a high hardness material such as TiC or TiN by Tj plating, vapor deposition, sputtering, or ion bubbling. After rating, etc., or at the same time as vapor deposition, ion blating, etc., N or C
It is covered with a thin surface layer portion 9 formed by etching or the like.

As described above, the magnetic chuck of the present invention is constructed, and in order to use it, for example, 1. As shown in the figure, a workpiece or workpiece 10 made of a magnetic material is placed on the left side of the magnetic chuck. It can be magnetically coupled and fixed.

In this case, the lines of magnetic force generated from the N pole of each magnet 6 pass through the magnetic body 2 or 3 disposed below, and after penetrating the inside of the workpiece or workpiece 10, S It passes through the magnetic body 3 or 1 placed above the pole, returns to the S pole,
This increases the strength of the magnetic field within this magnetic path, and the workpiece or workpiece 10 is strongly coupled to the magnetic chuck.

In this case, the lines of magnetic force of each magnet 6 extend from its N pole to the magnetic body 1.
, 2.3 and the workpiece or workpiece 10 made of a magnetic material to form a magnetic path, but if there is no workpiece or workpiece 10, this magnetic path is not formed.

Therefore, in conventional magnetic chucks, the internal magnetic field is disturbed and the magnetic force of magnets with small permeance coefficients tends to decrease significantly over time, but in the magnetic chuck of the present invention shown in the figure, , around each magnet 6,
Since the aforementioned demagnetization prevention section 7 is formed and thereby magnetically couples the N pole and S pole of each magnet 6, even a magnet with a small permeance coefficient can be used as a conventional magnet. Since the internal magnetic field of the chuck is not disturbed, it is possible to obtain a compact (small vertical thickness in the figure), strong magnetic chuck with little demagnetization over time.

As mentioned above, the demagnetization prevention section 7 is formed of a weakly magnetic material, and this weakly magnetic material is made of a non-metallic non-magnetic material such as a metal or synthetic resin, or an adhesive. It is formed by evenly mixing with the magnet 6 and has the properties of a semi-magnetic material or a weakly magnetic material, and weak magnetic lines of force corresponding to the degree of mixing penetrate this part, and the magnet 6 A weak closed magnetic path is formed between the two poles 8.

Therefore, this prevents the internal magnetic field of the magnet 6 from being disturbed, and also prevents the magnetic force of the magnet 6 from decreasing significantly over time.

Furthermore, as described above, between each magnetic pole surface of each magnet 6 and the magnetic body 1, 2, or 3, there is a gap formed between the magnetic pole surface of the magnet and the magnetic body when they are mechanically attracted and assembled. A bonding portion 8 is formed by applying a tightly adsorbed bonding material such as a synthetic resin adhesive having high magnetic permeability to the gap formed, so that each magnetic pole face and the magnetic body 1.2.3 are connected to each other. In addition, a gap with large magnetic resistance is not formed between the coupling portions 8 and 8.
In this case, since a close adsorption bond having high magnetic permeability is formed or interposed, the magnetic force from each magnet 6 is not reduced.

In fact, since no gap is formed as in the conventional case, demagnetization over time is reduced and the magnetic force of the magnet 6 is improved.

The tightly adsorbed bond, such as adhesive with high magnetic permeability, which forms this bonding part 8, is formed by evenly mixing extremely fine powder or particles of ferromagnetic material into a synthetic resin adhesive. Depending on the degree of ferromagnetic material mixed with it, it has almost the same magnetic properties as ferromagnetic material, and is designed to perform the above-mentioned function.

Further, at least the magnetic attraction surface of the magnetic chuck, or
As mentioned above, the magnetic material 1.2.3 has a thin surface layer 9 made of TiC or TiN on the attraction surface or the entire surface.
is formed or coated to protect the magnetic chuck from wear.

Therefore, this prevents the surface of the magnetic chuck from being scratched or worn, and provides corrosion resistance.

Note that this surface layer portion 9 may be formed on the entire surface of the magnetic chuck as shown in the figure, but the surface layer portion 9 may be formed on the entire surface of the magnetic chuck, but the surface layer portion 9 may be formed on the magnetic body 1. 2. It may be formed only on the magnetic attraction surface of No. 3.

As explained above, according to the present invention, a demagnetization prevention part is formed around the magnet, and this forms a weak magnetic path even when not in use, so that the magnetic force of the magnet can be reduced. do not have.

In addition, an adhesive with high magnetic permeability is applied between both magnetic pole faces of the magnet and the magnetic body facing them, and this forms a joint, so the magnetic force of the magnet does not attenuate. , it is now possible to strongly connect workpieces, processed materials, etc., by penetrating opposing magnetic bodies.

Furthermore, since the surface of the magnetic chuck of the present invention is coated with a high hardness material, it has wear resistance and corrosion resistance, thereby improving durability.

In the embodiments described above, if a magnet having a large coercive force and a large energy product, such as a rare earth magnet, is used as the magnet, a strong magnetic coupling force can be obtained despite the small size.

[Brief explanation of the drawing]

The figure is a sectional view of a magnetic chuck showing an embodiment of the present invention. 1, 2. 3...Magnetic material, 4,5...
- Non-magnetic material, 6... Magnet, 7... Demagnetization prevention part, 8... Coupling part, 9... Surface layer part, 10... ...work or processed material.

Claims (1)

[Claims for Utility Model Registration] 1. A magnetic chuck in which a plurality of magnets are interposed at intervals between opposing plate-shaped magnetic bodies, and the end faces of the magnetic bodies form magnetic attraction surfaces, A demagnetization prevention part made of a weak or semi-magnetic material is formed around the magnet so as to form a relatively weak magnetic path between both magnetic poles of the magnet and magnetically couple the two magnetic poles. magnetic chuck. 2. The magnetism according to claim 1 of the utility model registration claim, characterized in that a high magnetic permeability binder is interposed in the gap between the magnetic pole surface of each of the magnets and the adsorption bonding surface of the plate-shaped magnetic body. Chuck. 3. The magnetic chuck according to claim 1 or 2, wherein the magnetically attracting surface of the magnetic material is coated with a wear-resistant, high-hardness material to form a surface layer.