JPS5943068Y2 - 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 utilizes a permanent magnet or an electromagnet, and controls the strength of the magnetic field formed by forming a magnetic circuit for lines of magnetic force generated from its magnetic poles.
Furthermore, by using the magnetic attraction force controlled by this, workpieces and processed materials made of magnetic materials can be magnetically adsorbed and fixed.

However, conventional magnetic chucks do not.

There were disadvantages in that the shape was difficult and the magnetic attraction force or binding force was weak.

Further, if an attempt is made to increase the magnetic coupling force, many permanent magnets are required, and the shape thereof becomes complicated, making it difficult to manufacture.

In view of the above-mentioned drawbacks of the conventional art, an object of the present invention is to provide a magnetic plate comprising a magnetic plate having a permanent magnet and a magnetic path forming plate adjacent to the magnetic plate so as to be relatively slidable. The magnetic coupling portion constituting the path forming plate, the non-magnetic coupling portion surrounding the magnetic coupling portion, and the inner portion of the magnetic path forming magnetic material portion may be linear, rectangular, triangular, or triangular. It is an irregular shape that is different from other regular polygons, and is easily formed by electric machining such as wire cut electric discharge machining so that it has one continuous contour shape, and is attached to the magnetic coupling part of the magnetic path forming plate. When one of the magnetic poles of the above permanent magnet is opposite and adjacent to each other,
To provide a magnetic chuck that generates a strong magnetic attraction force and does not generate a strong magnetic attraction force when the magnetic pole faces and adjoins the non-magnetic coupling portion of the magnetic path forming plate.

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

The magnetic chuck 1 of the present invention shown in FIG. 1 has a disk or low cylindrical shape, and a portion constituting the entire surface of the rib is formed by a magnetic path forming plate 2 made of a magnetic material. At approximately the center of the plate 2, a magnetic coupling part 3 made of a magnetic material is fitted, which is shaped like a sea star and has one continuous contour.

This magnetic coupling part 3 has a plurality of protrusions 3 on the peripheral part in the front direction.
It has a.

and. Around this magnetic coupling part 3, a non-magnetic coupling part 4 having a shape substantially similar to the magnetic coupling part 3 is formed. It is spaced apart from the forming magnetic material portion 5.

As shown in FIG. 2 in detail, the magnetic chuck 1 shown in FIG. A magnetic plate 7 is slidably disposed adjacent to the magnetic plate 7.

In addition, this magnetic play) 7 has two magnetic poles N on the lower side of the central portion in addition to each protruding portion 3a of the magnetic coupling portion 3, if necessary.
A permanent magnet 8 is arranged so that the two are in contact with each other.

In FIG. 1, a plurality of permanent magnets 8 are provided approximately near the tips of the plurality of projections 3a, as shown by dotted lines.

As shown in FIG. 2, around these permanent magnets 8,
The other magnetic pole on which the non-magnetic material 9 is disposed and which is formed on the lower surface of the permanent magnet 8 is adjacent to the magnetic plate magnetic portion 10 that constitutes almost the entire magnetic plate 1 .

The magnetic coupling portion 3 is provided on the upper surface of the magnetic path forming plate 2.
．． The upper end surfaces of the non-magnetic coupling portion 4 and the magnetic path-forming portion 5 are exposed to form a planar magnetic attraction surface 12 .

A workpiece or workpiece (not shown) made of a magnetic material is placed on this magnetic attraction surface 12.

Further, the magnetic coupling portion 3. The magnetic pole opposing surface 14 consisting of the lower end surfaces of the non-magnetic coupling portion 4 and the magnetic path forming magnetic portion 5 is also in contact with one of the magnetic poles formed on the upper end surface of the permanent magnet 8 of the magnetic plate 7 .

Further, another part of the magnetic plate magnetic part 10 is partially adjacent to the other magnetic pole of the permanent magnet 8.

It extends upward and contacts the lower surface of the magnetic path forming magnetic material portion 5 of the magnetic pole facing surface 14 .

The magnetic chuck 1 of the present invention is configured as described above.

Next, its effect will be explained. As shown in FIGS. 1 and 2, the magnetic chuck 1 of the present invention has a magnetic path forming plate 2 on which magnetic poles on the upper end surface of each permanent magnet 8 of a magnetic plate 7 are disposed adjacent to each other. In the first state where the permanent magnets 8 face and are in contact with the lower end surface of the magnetic coupling part 3 , the lines of magnetic force of each permanent magnet 8 are connected to the magnetic coupling part 31 of the workpiece or workpiece,
Magnetic material portion for forming magnetic path 5. Magnetic part 1 for magnetic plate
0 to form a closed magnetic path, and the strength of the magnetic field within this magnetic path is increased.

Therefore, the magnetic coupling between the magnetic attachment surface 12 of the magnetic path forming plate 2 disposed in this magnetic path and the workpiece or workpiece is strong, and in this state, the workpiece or workpiece is held by the magnetic chuck. It is firmly fixed at 1.

That is, in this state, the magnetic chuck 1 generates a strong magnetic attraction force on its magnetic attraction surface 12.

On the other hand, in the magnetic chuck 1 configured as shown in FIGS. 1 and 2, as described above, the magnetic path forming plate 2 and the magnetic plate t7 are slidably adjacent to each other by rotation or other movement relative to each other. Therefore, these are shifted from the corresponding state shown in FIGS. 1 and 2, so that each magnetic pole on the upper end surface of each permanent magnet 8 is aligned with the lower end surface of the non-magnetic coupling portion 4 of the magnetic path forming plate 2. A second state in which they face each other and are in contact with each other is established.

This can be done, for example, by slightly rotating the magnetic path forming plate 2 disposed on the upper side with respect to the magnetic plate 7 in the clockwise or counterclockwise direction in FIG.

In the second state where the positions are set in this manner, the lower magnetic poles formed on the upper end surface of each permanent magnet 8 are in contact with the lower end surface of the non-magnetic coupling portion 4, respectively.

The non-magnetic coupling portion 4 is made of a non-magnetic material made of a metal 1 alloy or a synthetic resin, or a semi-magnetic material having a function of preventing the demagnetizing effect of the permanent magnet 8, which will be described later.
Its magnetic permeability is low and magnetic resistance is increased.

Therefore, the lines of magnetic force generated from the permanent magnet 8 whose one magnetic pole is in contact with the non-magnetic coupling portion 4 are weakened by its magnetic resistance and cannot form a strong magnetic field.

Therefore, in this case, a strong magnetic attraction force is not generated on the magnetic attraction surface 12 of the magnetic path forming plate 2, so that the workpiece or workpiece described above is not attached to the magnetic attraction surface 12.
The workpiece or workpiece is not strongly magnetically attracted to the magnetic chuck 1 and remains in a fixed state, but can freely and easily move relative to the magnetic chuck 1.

Now, as mentioned above, the non-magnetic coupling section 4.

In order to prevent the effect of the permanent magnet 8, a case will be described in which it is made of a semi-magnetic material.

Generally, the magnetic force of the permanent magnet 8 decreases when a magnetic body is repeatedly brought into contact with and separated from the magnetic pole of the permanent magnet 8, as in the first state and the second state as described above. There is a tendency to

In order to prevent this, even if the permanent magnet 8 is in the second state, it must be in the same direction, albeit weaker, so that its internal magnetic field will not be disturbed too much. This is to form a magnetic path.

That is, for this purpose, the semimagnetic material forming this non-magnetic coupling portion 4 is...

It is formed by uniformly mixing magnetic powder or particles with non-magnetic synthetic resin or adhesive, so that it has weak magnetic or semi-magnetic properties.

Therefore, even if the magnetic chuck 1 is in the second state, one magnetic pole of the permanent magnet 8 that is in contact with the lower end surface of the non-magnetic coupling portion 4 has a non-magnetic state made of the semi-magnetic material. Weak lines of magnetic force passing through the joint 4 are formed, and the permanent magnet 8
The internal magnetic field of is less disturbed.

The magnetic force of the permanent magnet 8 is also less likely to decrease.

In the magnetic chuck 1 of the present invention described above, the magnetic coupling part 3 has an unusual shape such as a sea star shape having a plurality of protrusions 3a, and is formed with one connected outline, and the protrusions 3a A non-magnetic coupling part 4 is arranged to surround the periphery of the magnetic path forming plate 2, and a permanent magnet 8 is arranged to face these parts.
The magnetic adsorption force can be easily controlled by only slightly shifting the corresponding positional relationship between the magnetic plate L and the magnetic plate L, and the magnetic coupling part 3 has a single sea star shape with a plurality of protrusions 3a. Since it is composed of a continuous contour, 1
For example, it can be easily formed by electrical machining such as wire cut electrical discharge machining.

In addition, since the inner portions of the non-magnetic coupling portion 4 and the magnetic path-forming magnetic material portion 5, which are formed in a substantially similar shape to the magnetic coupling portion 3, are also formed with one continuous contour, wire-cut electric discharge processing is performed. It can be easily formed by electrical processing such as.

FIG. 3 shows a magnetic chuck 11 showing another embodiment of the present invention.
FIG.

In the magnetic chuck 1 shown in FIGS. 1 and 2, this magnetic chuck 11 includes the outer or inner periphery of each of the magnetic coupling portion 3, its protruding portion 3a, the non-magnetic coupling portion 4, and the magnetic path-forming portion 5. The only difference is that the surface is slanted as shown, and the point of the pond is the same as that of the magnetic chuck 1 shown in FIG.

Therefore, the same constituent elements are given the same minus sign or the same code with the 10th place being 2, and the explanation thereof will be omitted.

As shown in the figure, the protruding portion 23a of the magnetic coupling portion and the outer peripheral wall portion of the non-magnetic coupling portion 24 expand upward.

It is shaped like a mortar that tapers downward.

If the magnetic coupling part 4 is a semi-magnetic material formed by uniformly mixing magnetic powder or particles with synthetic resin and adhesive, it can be cut out by cutting and used for fitting. In order to prevent the injected material from easily flowing out from below when injecting into the above-mentioned part and solidifying it to form it.

It is shaped like a mortar.

Further, by forming the mortar in this way, when the mixture is hardened and fixed inside the mortar, this part will not easily come off.

A magnetic chuck 30 showing still another embodiment of the present invention shown in FIG. 4 is formed in a rectangular shape when viewed from the front (top), and the portion constituting the entire flap is a magnetic path forming plate made of a magnetic material. 31, and the magnetic path forming plate 31 has a plurality of magnetic coupling portions 32 made of a magnetic material and having an irregularly shaped contour and having one continuous contour.
, 33.degree. 34, and non-magnetic coupling portions 35, 36, and 37 formed in substantially similar shapes surrounding these are fitted.

A plurality of protrusions 32a-34a are formed around the magnetic coupling parts 32-34.

This magnetic chuck 30 is similar to the magnetic chucks 1 and 21 shown in FIGS. 1 to 3 above.

It is arranged slidably adjacent to the magnetic plate (not shown) on the lower side of the magnetic path forming plate 31 in a complementary manner.

Permanent magnets (not shown) are disposed on the magnetic plate at appropriate locations corresponding to the magnetic coupling portions 32-34, particularly at locations corresponding to the protrusions 32a-34a.

The functions of each of these components are the same as those of the magnetic chucks 1, 1 shown in FIGS. 1 to 3 above.

However, in the magnetic chuck 30 shown in FIG. 4, a plurality of magnetic coupling parts 32-34 and non-magnetic coupling parts 35-37, which have irregularly shaped contours and are formed by one continuous line, are dispersed. It differs from those shown in FIGS. 1 to 3 in that it is shown in FIGS.

Further, although the protrusions 32a-34a do not protrude as far as the protrusion 3a shown in FIGS. 1-3, their functions are the same, and it goes without saying that they may protrude further.

The magnetic coupling parts 32-34 and the non-magnetic coupling parts 35-37 of the magnetic chuck 30 shown in FIG. Not only can it be easily formed by electric pressure, but also the magnetic attraction force of the magnetic chuck 30 can be easily controlled by the positional relationship of the protrusions 32a-34a.

As explained above, according to the present invention, the magnetic coupling part and the non-magnetic coupling part and the magnetic path forming magnetic part, which are arranged around the magnetic coupling part and have substantially similar contours, each have a different shape. Since it is formed in one continuous contour and is integrated, it is easily and economically manufactured and can also be conveniently and easily formed, for example by wire-cut electrical discharge machining. .

[Brief explanation of the drawing]

FIG. 1 is a plan view of a magnetic chuck showing an embodiment of the present invention, FIG. 2 is a partial cross-sectional view of the magnetic chuck shown in FIG. FIG. 4 is a partial cross-sectional view of a magnetic chuck showing another embodiment of the present invention. FIG. 4 is a plan view of a magnetic chuck showing still another embodiment of the present invention. 1, 21, 30...magnetic chuck, 2. ．．
22, 31...magnetic path formation play), 3.32~
35...Magnetic coupling part, 4,24.35-37.
...Non-magnetic coupling part. 5.25...Magnetic material part for magnetic path formation, T...
...Magnetic plate, 8...Permanent magnet, 10.
...Magnetic material part for magnetic plate, 12...
・Magnetic adsorption surface, 14...Magnetic pole opposing surface.

Claims (1)

[Scope of utility model registration request] 1. A magnetic coupling part made of a magnetic material, which has an irregular shape and has one continuous contour, and is arranged at a distance from the magnetic coupling part, and whose surface facing the magnetic coupling part follows the contour of the magnetic coupling part. A magnetic ratio body part for forming a magnetic path made of a magnetic material, which is formed in a substantially similar shape, is arranged around the magnetic coupling part, and the magnetic body part for forming a magnetic path is separated from the magnetic coupling part. Non-magnetic coupling part. A magnetic attraction surface formed of the magnetic coupling portion, the magnetic path forming magnetic material portion, and the non-magnetic coupling portion. A magnetic path forming plate that is formed from the magnetic coupling portion, the magnetic path forming magnetic material portion, and the non-magnetic coupling portion, and has a magnetic pole facing surface that is different from the magnetic attraction surface. A permanent magnet arranged such that one magnetic pole is in contact with the magnetic pole facing surface of the magnetic path forming plate, a part of which is adjacent to the magnetic pole of the magnetic path forming plate, a magnetic plate having a magnetic part for a magnetic plate, the other part of which is in contact with the magnetic part for forming a magnetic path, one of the magnetic poles of the permanent magnet facing and contacting the magnetic coupling part; When the magnetic flux of the permanent magnet passes through the magnetic coupling part, the magnetic path forming part, and the magnetic plate part, a field crossing path is formed, and a strong magnetic field is generated on the magnetic attraction surface. When an attractive force is generated and one magnetic pole of the permanent magnet faces and contacts the non-magnetic coupling part, the magnetic path is not formed and a strong magnetic attractive force is not generated on the magnetically attractive surface. A magnetic chuck characterized by: 2. The magnetic chuck according to claim 1, wherein the magnetic coupling portion has a plurality of protrusions formed in a sea star shape. 3. The magnetic chuck according to claim 1 or claim 2, wherein the non-magnetic coupling portion is made of a non-magnetic material or a semi-magnetic material. 4. The magnetic chuck according to claim 1, wherein the irregularly shaped contours of the magnetic coupling portion and the magnetic path forming plate are contours processed by wire cut electrical processing.