JP4437676B2 - Adsorption release device by residual magnetism of permanent electromagnetic magnet chuck and adsorption release method by residual magnetism of workpiece - Google Patents

Description

  The present invention relates to an apparatus and a method for canceling attraction of a workpiece due to residual magnetism in a permanent electromagnetic magnet chuck that fixes the workpiece by magnetic force.

  Patent Document 1 discloses a permanent electromagnetic magnet chuck. A permanent electromagnetic magnet chuck according to the technology includes a constant polarity permanent magnet, a reversible permanent magnet around which a main coil for polarity change is wound, and a magnetic pole member having a chuck surface at the tip and in contact with both permanent magnets. Both permanent magnets act on the magnetic pole member, flow current through the main coil, and change the polarity of the reversible permanent magnet, thereby attracting the workpiece to the chuck surface of the magnetic pole member (chucking operation) and releasing the adsorption. Operation (chucking release operation). By the chucking releasing operation by changing the polarity of the reversible permanent magnet, the magnetic field generated by both permanent magnets disappears outside the chuck surface, and the workpiece can be removed from the chuck surface. However, depending on the workpiece, due to the strong magnetic field generated during the chucking operation, the portion of the workpiece facing the chuck surface remains magnetized even after the magnetic field disappears, and residual magnetism occurs in the facing portion. For this reason, the work is still strongly adsorbed to the chuck surface, making it difficult to remove the work, and forcibly removing it may cause deformation or scratches that can reduce the accuracy of the work, and in some cases can cause injury during work. is there. Moreover, cutting iron powder etc. adhere to the processing reference surface of the workpiece, and the processing accuracy in the subsequent process is impaired.

  In order to eliminate the harmful effects caused by the residual magnetism of the workpiece, the permanent electromagnetic magnet chuck of Patent Document 1 is provided with an electromagnet. That is, the magnetic pole member includes an auxiliary magnetic pole member portion having a chuck surface at the tip and a main magnetic pole material portion in contact with both permanent magnets, and an auxiliary coil is wound around the auxiliary magnetic pole member portion to form an electromagnet, thereby chucking the workpiece. After the release, the work is demagnetized (residual magnetism removed) with an electromagnet.

  According to the technique of the above-mentioned Patent Document 1, (1) The maintainability of the electromagnet is poor. (2) To improve the maintainability of the electromagnet, when the electromagnet can be attached or detached, or when the electromagnet can be removed so that the electromagnet can be removed because it is not necessary when machining workpieces with small residual magnetism. When the electromagnet is reinstalled, the accuracy of the chuck surface may be impaired. There are problems such as.

  When the above (1) is described in detail, the auxiliary coil of the electromagnet may be damaged due to the work of attaching / detaching the workpiece, etc. In that case, the auxiliary magnetic pole member part becomes an obstacle of the repair work, Repair is difficult.

The above (2) will be described in detail. If the electromagnet is configured to be detachable, the auxiliary magnetic pole member part will also become an obstacle to the repair work during repair work, or if the auxiliary coil cannot be repaired, the auxiliary magnetic pole member part must be replaced. Although some problems remain, the maintainability of the electromagnet is improved. If the electromagnet is configured to be detachable, it is preferable to remove the electromagnet to obtain as much chucking force as possible when handling a work having a small residual magnetism. That is, when the polarity of the reversible permanent magnet is changed, the main coil requires a large current. In this case, in order to change the polarity efficiently, a large current is passed in a short time. At this time, the magnetic flux in the auxiliary coil of the electromagnet changes abruptly, and an electromotive force is generated in the auxiliary coil. Since this electromotive force prevents the reversible permanent magnet from being magnetized, the chucking force is weakened. In order to increase the chucking force, it is necessary to pass a large current through the main coil. Therefore, it is preferable to remove the electromagnet when handling a work that has little influence of residual magnetism, that is, does not require demagnetization. However, when re-attaching the electromagnet after repairing such an auxiliary coil, or when the work is changed and it is necessary to re-attach the electromagnet, between the mounting surfaces, that is, between the auxiliary magnetic pole member portion and the main magnetic pole member portion. There is a possibility that foreign matter may enter between them and the accuracy of the chuck surface may be impaired.
Japanese Patent No. 2974694

  Accordingly, an object of the present invention is to make it possible to easily remove a workpiece from a permanent electromagnetic magnet chuck, improve the maintainability of the permanent electromagnetic magnet chuck, and simultaneously maintain the accuracy of the chuck surface.

  Under the above-mentioned problems, the invention of claim 1 includes a constant polarity permanent magnet, a reversible permanent magnet around which a main coil is wound, and a main magnetic pole member in contact with both the constant polarity permanent magnet and the reversible permanent magnet. A plurality of main magnetic pole members are provided and adjacent to each other with different polarities, an auxiliary magnetic pole member having a chuck surface at the tip is fixedly provided on each main magnetic pole member, and each auxiliary magnetic member is provided. A frame body that holds a plurality of auxiliary coils corresponding to the magnetic pole member is detachably provided.

  According to claim 2, the auxiliary magnetic pole member is configured separately from the main magnetic pole member, and is fixed to the chuck surface of the main magnetic pole member. According to claim 3, the auxiliary magnetic pole member is configured integrally with the main magnetic pole member. Here, the auxiliary magnetic pole member is separate from the main magnetic pole member, in a state where the auxiliary magnetic pole member is fixed to the main magnetic pole member so as to be separable by bolts, etc., and by welding, pressure welding, press fitting, adhesion, etc. The term “integral” also includes a state in which the auxiliary magnetic pole member is integrally formed with the main magnetic pole member without being joined, including the state in which the main magnetic pole member is joined in a non-separable manner.

  According to a fourth aspect of the present invention, there is provided a method for releasing the attraction of a workpiece by the residual magnetism of the permanent magnet type magnetic chuck according to the first aspect of the present invention. Erase the magnetism.

  According to a fifth aspect of the present invention, there is provided a method for releasing the attraction by the work residual magnetism according to the first aspect of the present invention. The residual magnetism of the workpiece is erased by forming a magnetic field that is almost the same as the intrinsic coercivity of the workpiece by magnetizing it to the same polarity as the magnetic polarity.

According to a sixth aspect of the present invention, there is provided a method for releasing the attraction of a workpiece by means of the residual magnetism of the permanent magnet type magnetic chuck according to the first aspect of the present invention. The residual magnetism of the workpiece is demagnetized by forming the magnetic field weaker than the intrinsic coercive force of the workpiece by magnetizing it with the same polarity as that of the residual magnetism.

  According to a seventh aspect of the present invention, there is provided a method for releasing the attraction of a workpiece by means of the residual magnetism of the permanent magnet type magnetic chuck according to the first aspect of the present invention. The present invention is characterized in that the workpiece is removed while being magnetized to the same polarity as the polarity of the residual magnetism and forming a magnetic field weaker than the intrinsic coercive force of the workpiece.

  According to the first aspect of the present invention, an electromagnet is formed by the auxiliary magnetic pole member and the auxiliary coil, and even if there is residual magnetism in the work, the work can be easily made from the permanent electromagnetic magnet chuck by supplying a predetermined current to the auxiliary coil. Can be removed. In addition, the frame body with the auxiliary coil is detachable from the permanent electromagnetic magnet chuck, and the frame body is guided by the auxiliary magnetic pole member and positioned at the same time. Since the auxiliary magnetic pole member does not become an obstacle when repairing, the maintenance is also simplified, and at the same time, it is not necessary to remove or attach the auxiliary magnetic pole member for maintenance or attachment / detachment of the frame based on the strength of the residual magnetism of the work The accuracy of the chuck surface can be maintained.

  According to the second aspect, since the auxiliary magnetic pole member can be attached as a retrofit, the present invention can be easily applied to an existing permanent electromagnetic magnet chuck, and the length, shape, material, and the like can be improved.

  According to the third aspect of the present invention, the accuracy of the chuck surface is maintained, and further, since the auxiliary magnetic pole member and the main magnetic pole member are integrated, there is no joined portion, the magnetic resistance at that portion is not increased, and the magnetic flux is effectively used. it can.

  According to the fourth aspect, the demagnetization can be surely performed regardless of the polarity of the residual magnetism, and the demagnetization can be almost completely performed. Adverse effects such as powder adsorption are eliminated.

According to claim 5, since Ru can substantially demagnetized by the operation, together with adsorption with the workpiece remanence is releasable, eliminate the negative effects magnetization of a later step, it is possible to demagnetize more in a short time, reduce power consumption And long working hours are not required.

  According to the sixth aspect, the residual magnetism is reduced until the adsorption of the workpiece due to the residual magnetism can be released, so that the workpiece can be removed and the adverse effect of magnetization in the subsequent process can be reduced. Furthermore, since demagnetization can be performed in a shorter time, power consumption is reduced and a long working time is not required.

  According to claim 7, since the polarities of the workpiece surface and the chuck surface that face each other are the same polarity, they repel each other, and the workpiece continues to receive a force in a direction away from the chuck surface, so that the workpiece can be easily removed. It becomes.

  FIG. 1 shows a permanent electromagnetic magnet chuck 1 as a premise of the present invention, and FIG. 2 shows a frame body 3 used in a suction release device 2 by residual work magnetism of the permanent electromagnetic magnet chuck 1 of the present invention. Show. FIG. 3 is a partially enlarged view of FIG. 2 and shows four auxiliary coils 6. 4 is a cross-sectional view taken along the line AA of FIG. 3, and FIG. 5 is a connection diagram schematically showing a connection example of the four auxiliary coils 6. In FIG. FIG. 6 shows a state in which the auxiliary magnetic pole member 4 is attached to the permanent electromagnetic magnet chuck 1 and the frame 3 is incorporated therein. 7 and 9 show a chucking operation and a chucking release time, respectively. FIG. 8 is a plan view of FIG. 7, which is an overall view of the permanent electromagnetic magnet chuck 1 during the chucking operation, and the auxiliary coil control that constitutes the suction release device 2 together with the frame 3 and the plurality of auxiliary coils 6. A circuit 17 is also shown.

  First, in FIG. 1, a permanent electromagnetic magnet chuck 1 includes a plurality of constant polarity permanent magnets 5, a plurality of reversible permanent magnets 7 around which a main coil 9 is wound, both constant polarity permanent magnets 5, and reversibility. And a plurality of main magnetic pole members 8 in contact with the permanent magnet 7. The reversible permanent magnet 7 and the main magnetic pole member 8 are both prismatic, and are in contact with each other on their upper and lower surfaces, with a fixed interval inside the chuck body 10 and the permanent electromagnetic magnet chuck 1 of FIG. Corresponding to the auxiliary magnetic pole member 4 shown in the overall plan view of FIG.

  The lower surface of the reversible permanent magnet 7 is in contact with the inner bottom of the chuck body 10 with a polarity different from the polarity of the adjacent reversible permanent magnet 7, and the upper portion of the main magnetic pole member 8 is the chuck upper surface body 11. The chuck surface 8a is formed by fitting in the hole 11a and being exposed in the same plane as the upper surface of the chuck upper surface body 11. The constant-polarity permanent magnet 5 is interposed between adjacent main magnetic pole members 8 in a space formed by the main coil 9 and the chuck upper surface body 11, and the main magnetic pole member 8 is formed by the N or S magnetic pole surface. The main magnetic pole members 8 adjacent to each other are given different polarities. Thus, the plurality of main magnetic pole members 8 are provided in a plurality of aligned states and are adjacent to each other with different polarities.

  The main magnetic pole member 8, the chuck body 10, and the auxiliary magnetic pole member 4 are made of a material having a large relative magnetic permeability and a small residual magnetic flux density, for example, soft iron or silicon steel. Further, the chuck upper surface body 11 is made of a non-magnetic material so that the magnetic flux is effectively applied to the workpiece 12.

  Next, in FIG. 2, the frame 3 is made of a main pole using a material such as plastics, rubber, glass, ceramics, wax, sponge (the surface is preferably formed into a film and has no holes). A plate-like member having the magnetic pole member insertion hole 13 at a position corresponding to the member 8 is formed by, for example, a forming die. During the molding, the auxiliary coil 6 in each winding state is supported at a predetermined position of the insert molding die and is positioned around the magnetic pole member insertion hole 13 after molding. When the frame 3 is formed, one or more mounting holes 14 are formed at appropriate positions.

  In order to obtain rigidity, the frame 3 may be formed of a skeleton with a non-ferromagnetic material such as aluminum, or glass fibers, carbon fibers, or the like may be mixed therein. The thickness of the frame 3 is set to be equal to or less than the height of the auxiliary magnetic pole member 4 except when an elastic deformation member such as a sponge is used.

  Adjacent auxiliary coils 6 are wound in the same direction or in opposite directions, and are connected so that currents flow in opposite directions. In the embodiment, as shown in FIG. 5, a plurality of, for example, four auxiliary coils 6 are connected in series to form one connection group. Each connection group is connected to the connection line 16 in parallel. In addition, you may connect all the auxiliary coils 6 in series or in parallel, without forming a connection group.

  In FIG. 6, the frame 3 is detachably combined with the auxiliary magnetic pole member 4. For this reason, the plurality of auxiliary magnetic pole members 4 are prismatic bodies having the same bottom area as the main magnetic pole member 8 and are configured to have a height substantially equal to the thickness of the frame body 3 and are fixedly attached to the chuck surface 8a. A chuck surface 4a is formed on the upper surface to replace the chuck surface 8a. The auxiliary magnetic pole member 4 is attached to the main magnetic pole member 8 by using the attachment bolt 15 or by adhesion. At the time of this combination, the magnetic pole member insertion hole 13 is guided and inserted by the auxiliary magnetic pole member 4. As a result, the auxiliary coil 6 is located around the auxiliary magnetic pole member 4 and can be easily detached from the position. In this mounted state, the upper surface of the frame 3 does not protrude beyond the chuck surface 4 a of the auxiliary magnetic pole member 4.

  As shown in FIG. 10, the auxiliary magnetic pole member 4 can be formed as an integral member by extending the tip portion of the main magnetic pole member 8. That is, the main magnetic pole member 8 includes an auxiliary magnetic pole member portion having a chuck surface 4a and a main magnetic pole member portion. If the auxiliary magnetic pole member 4 and the main magnetic pole member 8 are formed of an integral member, that is, an integral member without being joined, the joined portion is eliminated, so that the magnetic resistance is not increased and the necessary magnetic force can be secured. It is advantageous.

  The frame 3 is a member that copes with the residual magnetism of the work 12. Accordingly, after the workpiece 12 is processed, the frame 3 is necessary when the workpiece 12 has a small residual magnetism, or even if the workpiece 12 has a residual magnetism, the workpiece 12 itself is lightweight and can be easily removed from the chuck surface 4a. Therefore, the frame 3 may be detached from the permanent electromagnetic magnet chuck 1. If the frame 3 is removed from the permanent electromagnetic magnet chuck 1, there is no risk of damage to the auxiliary coil 6 inside it, and adverse effects caused by the auxiliary coil 6 can be avoided. That is, an electromotive force is generated in the auxiliary coil 6 during the chucking operation, and the reversible permanent magnet 7 is prevented from being magnetized, so that a necessary magnetic flux (chucking force) is obtained on the chuck surface 4a of the auxiliary magnetic pole member 4. Therefore, it is possible to avoid the necessity of flowing a larger current through the main coil 9.

  When the chuck surface 4a is a horizontal surface or a loose inclined surface, the frame body 3 may be fixed to the permanent electromagnetic magnet chuck 1 with a bolt, a double-sided adhesive tape, or the like, but may be fixed only by its own weight. In this combined state, the frame 3 is regulated by the fitting of the magnetic pole member insertion hole 13 and the auxiliary magnetic pole member 4 and is placed at a predetermined position, and the magnetic flux when the polarity of the reversible permanent magnet 7 is changed. Even if the force is applied by the change in the position, it is maintained at a predetermined position. On the other hand, when the chuck surface 4a is a vertical surface or a steeply inclined surface, the frame 3 is fixed to the permanent electromagnetic magnet chuck 1 with a bolt, a double-sided adhesive tape, or the like. At this time, the mounting hole 14 is used for bolt insertion.

  FIGS. 7 and 8 show a case in which the frame 3 is mounted on the permanent electromagnetic magnet chuck 1 and a workpiece 12 made of a ferromagnetic material such as iron or nickel is magnetically chucked by the chuck surface 4 a of the auxiliary magnetic pole member 4. Shows the state. During the chucking operation, the chuck start switch 20 is operated and controlled by the main coil control device 18 so that a current flows through the main coil 9 to have the polarity shown in the figure. The magnetic flux from the constant polarity permanent magnet 5 is merged by the main magnetic pole member 8 and reaches the magnetic work 12 from the main magnetic pole member 8 and the auxiliary magnetic pole member 4. Then, the magnetic flux in the work 12 returns to the original state from the adjacent auxiliary magnetic pole member 4 and main magnetic pole member 8 through the constant polarity permanent magnet 5, the reversible permanent magnet 7, and the chuck body 10. By such a closed magnetic path, the workpiece 12 is magnetically attracted and fixed to the chuck surface 4a. In this state, processing necessary for the workpiece 12 is performed.

  When the machining of the workpiece 12 is completed, the chuck release switch 21 is operated to release the chucking, and is controlled by the main coil control device 18 so that a current in the direction opposite to that at the time of the chucking operation flows. Thus, the polarity of the reversible permanent magnet 7 is reversed. Thereby, the magnetic fluxes from both the reversible permanent magnet 7 and the constant polarity permanent magnet 5 form a closed circuit inside the permanent electromagnetic magnet chuck 1 through the main magnetic pole member 8 and the chuck body 10. Since the magnetic flux to the outside of the chuck surface 4a disappears and the magnetic attraction to the work 12 disappears, the work 12 can be removed from the chuck surface 4a.

  However, if the work 12 has residual magnetism, it becomes difficult to remove the work 12 from the chuck surface 4 a of the auxiliary magnetic pole member 4. That is, a magnetic flux in the same direction as that of the auxiliary magnetic pole member 4 and the main magnetic pole member 8 at the time of chucking remains on the work 12, and the work 12 is attracted to the chuck surface 4a even after the chucking is released. The degree (strength) of this residual magnetism varies depending on the workpiece material, shape, processing history such as heat treatment and machining, etc., but a material that is hard and has a high residual magnetic flux density such as die steel has a large residual magnetic flux such as soft iron. A material with low density is small. FIG. 11 is a schematic diagram of a magnetic history curve showing changes in the magnetic flux density B and the magnetic polarization J accompanying a change in the magnetic field strength H of a certain workpiece 12. A solid line is a BH magnetic history curve expressed by magnetic flux density, and a dotted line is a JH magnetic history curve expressed by magnetic polarization. FIG. 12 shows a demagnetization curve of a certain work 12, and is the second quadrant of the magnetic history curve of FIG. Therefore, the suction release is performed by the following method using the permanent magnet chuck 1 composed of a plurality of auxiliary coils 6, the frame 3, and the auxiliary coil control circuit 17. Do.

  (1) The removal switch 19 is operated to cause an alternating attenuation current to flow through the auxiliary coil 6 via the auxiliary coil control circuit 17. The alternating attenuation current gradually approaches zero while alternating a current of a magnitude necessary for demagnetization. As a result, the residual magnetism of the work 12 approaches zero while changing the polarity along the magnetization curve. According to this method, the demagnetization can be reliably performed regardless of the polarity of the residual magnetism, and the demagnetization can be almost completely performed. Therefore, the adsorption by the residual magnetism of the workpiece can be released, and the adverse effect of the residual magnetism in the subsequent process of the workpiece 12 For example, adsorption of cutting powder and the like is eliminated.

(2) The removal switch 19 is operated, and a current in a predetermined direction is passed through the auxiliary coil 6 via the auxiliary coil control circuit 17 so that the chuck surface 4a is magnetized to the same polarity as the remanent magnetism of the workpiece 12. A magnetic field substantially identical to the intrinsic coercive force Hcj of the workpiece 12 is formed. Since Accordingly Ru can substantially demagnetized, the suction by the workpiece remanence is releasable, adverse effects of magnetization in the subsequent steps is eliminated.

  (3) The removal switch 19 is operated, and a current in a predetermined direction is passed through the auxiliary coil 6 via the auxiliary coil control circuit 17 to magnetize the chuck surface 4a to the same polarity as the remanent magnetism of the workpiece 12. A magnetic field weaker than the intrinsic coercivity of the workpiece 12 is formed. As a result, the residual magnetism is reduced until the adsorption due to the workpiece residual magnetism can be released, so that the workpiece 12 can be removed and the adverse effect of magnetization in the subsequent process can be reduced.

  (4) The removal switch 19 is operated, and a current in a predetermined direction is passed through the auxiliary coil 6 via the auxiliary coil control circuit 17 so that the chuck surface 4a is magnetized to the same polarity as the remanent magnetism of the workpiece 12. The work 12 is removed while forming a magnetic field weaker than the intrinsic coercivity of the work 12. Since the polarities of the surface of the workpiece 12 and the chuck surface 4a facing each other are the same polarity, they repel each other and the workpiece 12 receives a force in a direction away from the chuck surface 4a. As a result, the workpiece 12 can be removed. The magnetic field formed at this time is not limited, and may be a magnetic field considerably weaker than the intrinsic coercivity of the workpiece 12. The auxiliary coil 6 is energized only for a predetermined time, for example, 5 seconds required to remove the work 12 from the chuck surface 8a after the removal switch 19 is operated.

  In any of the above methods (1), (2), (3), and (4), the removal switch 19 is not provided and the chuck release switch 21 is operated so that the chucking is released or the chuck is released. A configuration may be adopted in which current is passed through the auxiliary coil 6 via the auxiliary coil control circuit 17 later than the king cancellation.

  The present invention can be applied not only to the permanent electromagnetic magnet chuck 1 but also to the permanent electromagnetic magnet chuck 1 incorporated in a machine tool. In designing the new permanent electromagnetic magnet chuck 1, the auxiliary magnetic pole member 4 and the main magnetic pole member 8 are formed as an integral unit. However, when the existing permanent electromagnetic magnet chuck 1 is improved, the main magnetic pole member 8. The auxiliary magnetic pole member 4 is attached to the frame 3, and the frame 3 is incorporated.

1 is a partial cross-sectional view of a permanent electromagnetic magnet chuck 1 according to the present invention. 2 is an overall plan view of a frame body 3 and an auxiliary coil 6. FIG. FIG. 3 is a partially enlarged view of FIG. 2. It is AA sectional drawing of FIG. 3 is a connection diagram schematically illustrating a connection example of an auxiliary coil 6. FIG. The state when the frame 3 is assembled in the permanent electromagnetic magnet chuck 1 according to the present invention is shown. FIG. 3 is a partial cross-sectional view of the permanent electromagnetic magnet chuck 1 according to the present invention during a chucking operation. 1 is an overall plan view of a permanent electromagnetic magnet chuck 1 according to the present invention during a chucking operation. FIG. 3 is a partial cross-sectional view of the permanent electromagnetic magnet chuck 1 according to the present invention when chucking is released. A state when the frame body 3 is incorporated into the permanent electromagnetic magnet chuck 1 in which the auxiliary magnetic pole member 4 is formed integrally with the main magnetic pole member 8 is shown. It is a schematic diagram of a magnetic history curve showing a change in magnetic flux density and a magnetic polarization accompanying a change in magnetic field strength of a certain work 12. It is a schematic diagram of a demagnetization curve of a certain work 12.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Permanent electromagnetic type magnetic chuck 2 Adsorption release device by permanent magnet type magnetic chuck workpiece residual magnetism 3 Frame 4 Auxiliary magnetic pole member 4a Chuck surface 5 Constant polarity permanent magnet 6 Auxiliary coil 7 Reversible permanent magnet 8 Main magnetic pole member 8a Chuck surface DESCRIPTION OF SYMBOLS 9 Main coil 10 Chuck body 11 Chuck upper surface body 11a Hole 12 Work piece 13 Magnetic pole member insertion hole 14 Mounting hole 15 Mounting bolt 16 Connection line 17 Auxiliary coil control circuit 18 Main coil control device 19 Removal switch 20 Chuck start switch 21 Chuck release switch

Claims (7)

A constant polarity permanent magnet (5), a reversible permanent magnet (7) wound with a main coil (9), and a main magnetic pole member in contact with both the constant polarity permanent magnet (5) and the reversible permanent magnet (7) In the permanent electromagnetic magnet chuck (1), a plurality of the main magnetic pole members (8) are provided adjacent to each other with different polarities.
An auxiliary magnetic pole member (4) having a chuck surface (4a) at the tip is fixedly provided on each main magnetic pole member (8), and holds a plurality of auxiliary coils (6) corresponding to each auxiliary magnetic pole member (4). A suction release device (2) based on the residual magnetism of a permanent electromagnetic magnet chuck, wherein the frame (3) is detachably provided.   The permanent electromagnetic type according to claim 1, wherein the auxiliary magnetic pole member (4) is configured as a separate body from the main magnetic pole member (8) and is fixed to the chuck surface (8a) of the main magnetic pole member (8). Adsorption release device (2) by remanent magnetism of the magnet chuck.   2. The apparatus according to claim 1, wherein the auxiliary magnetic pole member (4) is integrally formed with the main magnetic pole member (8).   In the permanent magnet type magnet chuck adsorption release device (2) according to claim 1, the residual magnetism of the workpiece (12) is erased by passing an alternating attenuation current through the auxiliary coil (6). A suction release method using the residual magnetism of the workpiece.   In the permanent magnet type magnet chuck adsorption release device (2) according to claim 1, a current in a predetermined direction is supplied to the auxiliary coil (6) to cause the chuck surface (4a) to remain on the workpiece (12). Magnetization to the same polarity as the magnetic polarity and formation of a magnetic field substantially the same as the intrinsic coercivity of the work (12), thereby erasing the residual magnetism of the work (12), attracting by work residual magnetism Release method.   In the permanent magnet type magnet chuck adsorption release device (2) according to claim 1, a current in a predetermined direction is supplied to the auxiliary coil (6) to cause the chuck surface (4a) to remain on the workpiece (12). Magnetization to the same polarity as the magnetic polarity and formation of a magnetic field weaker than the intrinsic coercivity of the work (12), thereby demagnetizing the residual magnetism of the work (12) Release method.   In the permanent magnet type magnet chuck adsorption release device (2) according to claim 1, a current in a predetermined direction is supplied to the auxiliary coil (6) to cause the chuck surface (4a) to remain on the workpiece (12). A method of desorbing the workpiece by residual magnetism, wherein the workpiece (12) is removed while magnetizing to the same polarity as the magnetic polarity and forming a magnetic field weaker than the intrinsic coercive force of the workpiece (12).

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