JPS6240741Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a magnetic chuck, in particular,
The present invention relates to a magnetic chuck having magnetically active surfaces on opposing surfaces.

In Utility Application No. 57-170483, the applicant of the present application previously proposed that opposite surfaces of a magnetic chuck be used as magnetically active surfaces, and one of the magnetically active surfaces is used to hold a magnetic material such as a workpiece. It was proposed to use this as an attraction surface, and to use the other magnetically active surface as an attraction surface for positioning the magnetic chuck itself on a magnetic table such as a processing table.

According to the magnetic chuck, the magnetic chuck can be positioned on a magnetic table such as a processing table by the magnetic adsorption force of the magnetic chuck itself, so there is no need to use special fastening means such as bolts and nuts. The magnet chuck can be attached to and detached from the magnetic base by energizing and demagnetizing the magnetically active surface. Therefore, the work of attaching and removing the chuck can be carried out quickly.

By the way, in the magnetic chuck, when one magnetically active surface is in an excited state, the other magnetically active surface is also in an excited state, and both magnetically active surfaces are switched to excitation and demagnetization at the same time. Therefore, when one magnetically active surface of the magnetic chuck is placed in a demagnetized state in order to release a magnetic material such as a workpiece that is attracted to the magnetically active surface, the other magnetically active surface is also demagnetized. For example,
If the magnetic chuck receives an impact or the like when the magnetic body is released, the magnetic chuck may move on the magnetic stand when the magnetic body is released, so be careful when handling the magnetic chuck. There is a need.

Therefore, the present invention aims to provide a magnetic chuck that can be quickly attached to and removed from a magnetic stand, etc., and is even easier to handle. The magnetic chuck provided is characterized in that switching between the excitation and demagnetization of both of the magnetically active surfaces can be operated individually.

The features of the invention will become clearer from the following description of an illustrative embodiment showing a permanent magnet chuck using a plurality of permanent magnets as a source of magnetic force.

As shown in FIGS. 1 and 2, the permanent magnet chuck 10 according to the present invention includes a substrate 12 (see FIG. 2) made of a magnetic material and having a rectangular shape, and opposite upper and lower sides of the substrate. A pair of face plates 16, 16a, 16b each fixed to each surface via non-magnetic plates 14, 14a, 14b, and a large number of permanent magnets 18, 18a, 18b, 20, 20a,
20b.

Non-magnetic plate 14a placed on the top surface of substrate 12
As shown in FIG. 1, there is a pair of side portions 22 spaced apart from each other on both side portions of the substrate 12, each extending in the longitudinal direction of the substrate, and a pair of side portions 22 spaced apart from each other on each of the side portions. and an intermediate portion 24 extending in the longitudinal direction of the substrate. A pair of recesses 26 defined between the intermediate portion 24 and each side portion 22 and each extending in the longitudinal direction of the substrate are provided with recesses 26 that are movable in the longitudinal direction of the substrate using the recesses as guides. Movable plate 2 made of a non-magnetic material accommodated
8a is placed.

A large number of through holes 30 are formed in each side portion 22 of the non-magnetic plate 14a, and are arranged in a line at regular intervals in the longitudinal direction of the side portion, and the intermediate portion 24 has holes corresponding to the through holes 30. Similar through holes 30 are formed which are arranged in two rows. A plate-shaped permanent magnet 18a having a circular cross-sectional shape is arranged in each through-hole 30. Although an alnico magnet can be used as the permanent magnet 18a, it is preferable to use a permanent magnet having a high coercive force, such as a ferrite magnet or a rare earth metal magnet. Each permanent magnet 18a is magnetized in its thickness direction, and the permanent magnets are arranged so that their magnetization directions are alternately reversed in the longitudinal direction of the substrate and coincide with each other in the width direction of the substrate. There is. Each permanent magnet 18a is
The permanent magnets 18a are held via the non-magnetic plate 14a so that one magnetic pole surface is in contact with the upper surface of the substrate 12, and thereby the permanent magnets 18a constitute a first fixed permanent magnet group.

Each movable plate 28a has similar through holes 30 arranged in two rows corresponding to the through holes 30, and permanent magnets 20a similar to the permanent magnets 18a are arranged in the through holes. There is. Each permanent magnet 2
0a are arranged so that their magnetization directions are alternately reversed in the longitudinal direction of the substrate and coincide with each other in the width direction of the substrate. Each permanent magnet 20a
is held via the movable plate 28a so that one magnetic pole surface is in contact with the upper surface of the substrate 12,
Thereby, the permanent magnet 20a constitutes a first movable permanent magnet group.

One face plate 16a, which is fixed to the upper surface side of the substrate 12 via the non-magnetic plate 14a, has a large number of magnetically shielded plates that are magnetically isolated from each other via the non-magnetic member 32, as is well known in the art. A magnetic pole face portion 34 is provided. Each magnetic pole surface portion 34 extends in the width direction of the face plate 16a corresponding to the arrangement interval of the permanent magnets 18a along the longitudinal direction of the substrate. In the illustrated example, narrow magnetic pole face portions are employed such that the widthwise dimension of a pair of adjacent magnetic pole face portions 34 is approximately equal to the radius of the permanent magnet. It can be a part. The lower surface of the face plate 16a is connected to each permanent magnet 18a, 20 constituting the first fixed and movable permanent magnet group.
The upper surface of the face plate 16a constitutes a first magnetically active surface 36a.

A recess 40a (see FIG. 2) is formed at one end of the substrate 12 to accommodate the first operating mechanism 38a. The recess 40a extends in the width direction of the substrate 12 and is open to the upper surface of the substrate.
In the illustrated example, the first operating mechanism 38a includes an operating shaft 42 that is rotatably disposed within the recess 40a and has one end protruding to the side of the substrate;
It includes a pinion 44 provided on the operating shaft, and a rack 46 fixed to the lower surface of each movable plate 28a to engage with the pinion. Rack 46 extends in the longitudinal direction of each corresponding movable plate 28a. Therefore,
By rotating the operating shaft 42, as shown in FIG. 1, the movable plate 28a is moved to an excitation position where the magnetization directions of the fixed permanent magnet 18a and the movable permanent magnet 20a match when viewed in the width direction of the board. can be moved. Further, by rotating the operating shaft 42, as shown in FIG. 3, the movable plate 28a is placed in a demagnetized position where the magnetization directions of the fixed permanent magnet 18a and the movable permanent magnet 20a are different when viewed in the width direction of the board. can be moved.

In the excitation position shown in FIG. 1, as is well known in the art, when the magnetic member 48 is placed on the first magnetically active surface, magnetic properties are generated between the fixed permanent magnets 18a and between the movable permanent magnets 20a. In order to form a closed magnetic flux loop around the member 48 as shown in FIG. 4, the surfaces of the magnetic pole face portions 34 are magnetized so that each pair of magnetic pole face portions has a different magnetic pole. Therefore, in the excitation position, the first magnetically active surface 36a
is placed in an excited state. On the other hand, in the demagnetized position shown in FIG. 3, a closed magnetic flux loop as shown in FIG. 5 is formed between the fixed permanent magnet 18a and the movable permanent magnet 20a, as is well known in the art. As a result, the first magnetically active surface 36a is placed in an excited state, that is, a demagnetized state.

Non-magnetic plate 14b arranged on the lower surface of substrate 12
As illustrated in FIG. A movable plate 28b made of a non-magnetic material similar to that of the movable plate 28a is disposed within the recess 26. Permanent magnets 18b similar to the permanent magnets 18a are inserted into the through holes 30 of the side portions 22 and the intermediate portion 24 at every other permanent magnet in the longitudinal direction of the substrate 12 to constitute a second fixed permanent magnet group. are arranged so that they have the same magnetization direction. Through hole 3 between each permanent magnet 18b
0, a magnetic pole piece 18b' is arranged, but instead of the magnetic pole piece, a permanent magnet 18b similar to that described above is used.
can be arranged so that their magnetization directions are opposite, thereby providing a magnet arrangement similar to that shown in FIG.

In addition, in the through holes 30 of the movable plate 28b, permanent magnets 20b similar to the permanent magnets 20a are installed every other permanent magnet 20b in the longitudinal direction of the substrate to form a second movable permanent magnet group. The permanent magnets 18b are arranged so as to be opposite to the magnetization direction of each permanent magnet 18b of the fixed permanent magnet group. A magnetic pole piece 20b' is arranged in the through hole 30 between each permanent magnet 20b, but instead of the magnetic pole piece 20b', a permanent magnet 20b similar to that described above is used so that its magnetization direction is opposite to that of the magnetic pole piece 20b'. This allows a magnet arrangement similar to that shown in FIG.

The other face plate 16b, which is fixed to the substrate 12 on the lower surface side via the non-magnetic plate 14b, includes a large number of magnetic pole face portions 34a and 34b that are magnetically isolated from each other via the non-magnetic member 32. . Each of the magnetic pole face portions 34a, 34b extends in the width direction of the face plate 16b corresponding to the arrangement spacing of the permanent magnet 18b and the magnetic pole piece 18b' along the longitudinal direction of the substrate. In the illustrated example, each magnetic pole surface portion 34a, 34b
is set to have a wide width whose width is approximately equal to the diameter of the permanent magnet 18b, and one of the magnetic pole face portions 34b is continuous with each other. As shown in FIG. 2, the upper surface of the face plate 16b is connected to each permanent magnet 18 constituting the second fixed and movable permanent magnet group.
b, 20b and the magnetic pole piece, and the face plate 16
The lower surface of b constitutes the second magnetically acting surface 36b.

FIG. 6 shows an excitation state similar to that shown in FIG. 1, and in this excitation state, as is clear from the description of FIGS. 1 and 4, the second magnetically active surface 36b is in an excitation state. See you next time
As is clear from the description with reference to the drawings and FIG. 5, by moving both movable plates 28b in the longitudinal direction of the substrate 12, the second magnetically active surface 36b can be placed in a demagnetized state.

For switching between energizing and demagnetizing this second magnetically active surface 36b, a recess 40b is provided at the other end of the substrate, as shown in FIGS. 2 and 3. A second operating mechanism 38b similar to the first operating mechanism 38a is provided.
That is, the second operating mechanism 38b includes an operating shaft 42 which is rotatably disposed within the recess 40b and has one end protruding to the side of the substrate, a pinion 44 provided on the operating shaft, and a pinion 44 provided on the operating shaft. Rack 4 fixed to the upper surface of each movable plate 26b to engage with the pinion
6. Rack 46 extends in the longitudinal direction of each corresponding movable plate 26b. Therefore, by rotating the operating shaft 42, the movable plate 26b can be moved between the excitation position and the demagnetization position.

Note that in this embodiment, the substrates 12a, 12b,
Non-magnetic plates 14a, 124, face plates 16a, 16b,
Permanent magnets 18a, 18b, 20a, 20b and movable plates 28a, 28b constitute the chuck body.

In the permanent magnet chuck 10 according to the present invention,
Switching between magnetization and demagnetization of one magnetically active surface 36a is performed by a first operating mechanism 38a,
The other magnetically active surface 36b is switched between energization and demagnetization by a second operating mechanism 38b. Therefore, since each of the magnetically active surfaces 36a and 36b can be switched individually, for example, the other magnetically active surface 36b can be used as an adsorption surface for holding the chuck itself to a magnetic table such as a processing table.
In addition, one of the magnetically active surfaces 36a can be used as a holding surface for holding the workpiece, and when the workpiece is released, the magnetically active surface 36b remains in an excited state while only the magnetically active surface 36a is used. Can be switched to demagnetized state. Therefore, even when the workpiece is released from the permanent magnet chuck 10, the chuck can be reliably held on the processing table or the like, and movement of the chuck due to impact or the like is reliably prevented.

In the above description, the present invention has been described with reference to an example in which a permanent magnet is used as a magnetic generation source, but the present invention is not limited thereto and can be applied to an electromagnetic chuck that uses an electromagnet as the magnetic generation source.

According to the present invention, as described above, there is no need to use special fasteners such as bolts and nuts to attach the chuck itself to the magnetic stand, etc., so that the attachment and removal operations can be quickly performed. Moreover, since switching between excitation and demagnetization of a pair of magnetically active surfaces can be operated individually, handling is further facilitated by individually switching each magnetically active surface as necessary. Become.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view showing the permanent magnet chuck according to the present invention in an energized state, and FIG. 2 is a sectional view taken along the - line shown in FIG. 1. , FIG. 3 is a drawing similar to FIG. 1 showing the permanent magnet chuck according to the present invention in a demagnetized state, and FIG. 4 is a sectional view taken along the - line shown in FIG. FIG. 5 is a sectional view taken along the - line shown in FIG. 3, and FIG. 6 is a bottom view of the permanent magnet chuck shown in FIG. 1, partially cut away and shown in an energized state. It is. 12: Substrate, 14a, 14b: Nonmagnetic plate, 16
a, 16b: face plate, 18a: first fixed permanent magnet group, 18b: second fixed permanent magnet group, 20a: first movable permanent magnet group, 20b: second movable permanent magnet group, 6a, 36b: Magnetic action surface, 38a, 38
b: Operation mechanism.

Claims (1)

[Claims for Utility Model Registration] (1) A chuck body provided with magnetically active surfaces on opposing surfaces, and arranged on the chuck body to selectively and individually switch both magnetically active surfaces into an energized state and a demagnetized state. a magnetic chuck including operating means provided therein; (2) The chuck body is fixed to a substrate and to opposite surfaces of the substrate, each of which has a pair of face plates defining the magnetically active surface, and a side of the base opposite to each face plate of the substrate. first and second fixed permanent magnet groups are fixedly provided with respect to the substrate; said first and second
first and second movable permanent magnet groups for placing the corresponding magnetically active surfaces in an energized state and a demagnetized state in cooperation with a fixed permanent magnet group; A magnetic chuck according to claim 1, which includes first and second operating mechanisms for individually moving a group of movable permanent magnets. (3) The magnetic chuck according to claim 2, wherein each of the permanent magnets is made of a plate-shaped magnetic material magnetized in the thickness direction. (4) Each magnet of the first and second movable permanent magnet groups is arranged in a plurality of rows at a constant pitch in the moving direction of the movable permanent magnet group, and the magnets of the first and second movable permanent magnet groups are arranged in a plurality of rows at a constant pitch. Each of the magnets is arranged in a plurality of rows at the same pitch as each of the magnets of the first and second movable permanent magnet groups corresponding to the moving direction of the movable permanent magnet group. Magnetic chuck described in section 3). (5) Each magnet of the first movable permanent magnet group and each magnet of the first fixed permanent magnet are arranged such that the magnetization direction thereof is sequentially reversed in the arrangement direction of each magnet, Scope of patent registration request No.
The magnetic chuck described in (4). (6) The magnets of the second movable permanent magnet group are arranged so that their magnetization directions are the same, and the magnets of the second fixed permanent magnet are arranged so that their magnetization directions are the same as those of the second movable permanent magnet group. The magnetic chuck according to claim (4) of the utility model registration, wherein the magnet chuck is arranged so as to be opposite to the magnetization direction of each magnet of the magnet group.