JP2005305565A - Permanent electromagnetic magnet chuck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily remove a work from a permanent electromagnetic magnet chuck, by eliminating the influence of residual magnetism on the work. <P>SOLUTION: This permanent electromagnetic magnet chuck 1 has a constant polarity permanent magnet 5, a reversible permanent magnet 7 wound with a main coil 9, and magnetic pole members 4 and 8 contacting with the constant polarity permanent magnet 5 and the reversible permanent magnet 7 and having a chuck surface 4a for fixing the work 12; and is provided with a plurality of magnetic pole members 4 and 8 adjacent in mutually different polarity. The permanent electromagnetic magnet chuck 1 has a plurality of auxiliary coils 6 arranged on the chuck surface 4a side more than the constant polarity permanent magnet 5 and the reversible permanent magnet 7 in response to the respective magnetic pole members 4 and 8, and an auxiliary control device 17 for controlling an electric current of the auxiliary coils 6 for generating a magnetic field of the same pole as the residual magnetism generated on a magnetic pole member opposed surface of the work 12, that is, a magnetic field weaker than proper coercive force of the work 12 on the chuck surface 4a, in removal of the work 12 caused by releasing chucking by changing the polarity of the reversible permanent magnet 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a permanent electromagnetic magnet chuck that chucks a workpiece by magnetic force. When the workpiece is removed from the chuck surface, the workpiece is detached from the chuck surface due to the magnetic repulsion caused by the residual magnetism of the workpiece and the magnetic field generated by the auxiliary coil. The present invention relates to a permanent electromagnetic magnet chuck that causes the workpiece to be detached from the chuck surface after the residual magnetic flux of the workpiece is extinguished.

Patent Document 1 discloses a permanent electromagnetic magnet chuck. The permanent electromagnetic magnet chuck is equipped with an electromagnet for workpiece demagnetization, and when removing the workpiece from the chuck surface, after releasing the chucking of the workpiece, an alternating attenuation current is applied to the coil of the electromagnet for workpiece demagnetization, After demagnetizing the workpiece (removing residual magnetism), the workpiece is removed from the chuck surface.

As described above, demagnetization (removal of residual magnetism) of the workpiece is performed using an alternating type attenuation current. For this reason, according to the technique of Patent Document 1, there are the following problems. First of all, a long energization time (several tens of seconds) is required, which requires a long working time and a large amount of power consumption. Second, it is difficult to control the alternating attenuation current, and a complicated control device is required. Thirdly, the force required for workpiece removal cannot be made lighter than the weight of the workpiece.
Japanese Patent No. 2974694

Accordingly, an object of the present invention is to eliminate the above-described problems in a permanent electromagnetic magnet chuck, eliminate the influence of residual magnetism of the workpiece, and easily remove the workpiece from the permanent electromagnetic magnet chuck.

The permanent electromagnetic magnet chuck according to claim 1 is a chuck surface for fixing a work in contact with a constant polarity permanent magnet, a reversible permanent magnet around which a main coil is wound, and both the constant polarity permanent magnet and the reversible permanent magnet. In the permanent electromagnetic magnet chuck provided with a plurality of the magnetic pole members adjacent to each other with different polarities, the chuck surface is more fixed than the constant polarity permanent magnet and the reversible permanent magnet corresponding to each magnetic pole member. A magnetic field having the same polarity as the residual magnetism generated on the surface facing the magnetic pole member of the workpiece when the workpiece is removed when the chucking is released by changing the polarity of the reversible permanent magnet. And an auxiliary control device that controls the current of the auxiliary coil that generates a magnetic field weaker than the intrinsic coercive force of the workpiece on the chuck surface.

    The permanent electromagnetic magnet chuck according to claim 2 has a constant polarity permanent magnet, a reversible permanent magnet around which a main coil is wound, and a chuck surface that contacts the constant polarity permanent magnet and the reversible permanent magnet and fixes a workpiece. In the permanent electromagnetic magnet chuck, which is provided with a plurality of magnetic pole members and adjacent to each other with different polarities, the chuck surface side is closer to the fixed polarity permanent magnet and the reversible permanent magnet corresponding to each magnetic pole member. After chucking by changing the polarity of the plurality of auxiliary coils and the reversible permanent magnet, the magnetic field has the same polarity as the residual magnetism generated on the surface facing the magnetic pole member of the work, And an auxiliary control device for an auxiliary coil that generates a magnetic field substantially the same as the magnetic force on the chuck surface.

  A permanent electromagnetic magnet chuck according to a third aspect is dependent on the first and second aspects, wherein the auxiliary control device includes a storage device and an arithmetic device, and the storage device corresponds to the type of workpiece. The demagnetization information is stored, and the arithmetic device reads the demagnetization information corresponding to the input workpiece or a workpiece similar to the input workpiece from the storage device, and flows the demagnetization information to the auxiliary coil based on the demagnetization information. A power value is output.

  According to the first aspect of the present invention, an electromagnet is formed by the magnetic pole member and the auxiliary coil, and a magnetic field is generated on the chuck surface of the magnetic pole member simultaneously with the start of energization of the auxiliary coil by the auxiliary control device. Since the magnetic field is a magnetic field having the same polarity as the residual magnetism generated on the surface facing the magnetic pole member of the workpiece and is weaker than the inherent holding force of the workpiece, the surface facing the magnetic pole member and the chuck surface repel each other. The repulsive force acts as a force for separating the workpiece from the chuck surface. As a result, such a repulsive force acts on the workpiece when the workpiece is removed along with the chucking release of the workpiece, so that the workpiece can be easily removed.

  According to the second aspect of the present invention, an electromagnet is formed by the magnetic pole member and the auxiliary coil, and a magnetic field is generated on the work attracting surface side of the magnetic pole member simultaneously with the start of energization of the auxiliary coil by the auxiliary coil control device. Since the magnetic field is substantially the same as the intrinsic coercive force of the workpiece, the magnetic field eliminates the magnetic flux due to the magnetization (magnetic polarization) of the workpiece itself, and the workpiece is demagnetized. For this reason, the workpiece can be easily removed without being attracted to the chuck surface of the magnetic pole member.

  According to the invention of claim 3, the storage device of the auxiliary control device stores the demagnetization information of the workpiece corresponding to the type of workpiece, and the arithmetic device is similar to the input workpiece or the input workpiece. The demagnetization information corresponding to the work is read from the storage device, and the current value to be passed through the auxiliary coil is output based on the demagnetization information. It can be determined and output accurately and quickly.

1 to 5 show a mechanical configuration of a permanent electromagnetic magnet chuck 1 according to the present invention. FIG. 2 is a sectional view of the permanent electromagnetic magnet chuck 1 when the workpiece 12 is chucked. FIG. 3 is a sectional view showing a state in which the frame body 3 is assembled into the permanent electromagnetic magnet chuck 1. 4 is a plan view of the frame 3, and FIG. 5 is a sectional view when the chucking of the work 12 by the permanent electromagnetic magnet chuck 1 is released.

In these drawings, 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, their constant polarity permanent magnets 5 and reversible permanent magnets. And a plurality of main magnetic pole members 8 in contact with the magnet 7. The reversible permanent magnet 7 and the magnetic pole member 8 are both prismatic, and are arranged in a grid pattern in a state of being in contact with the upper and lower surfaces of the reversible permanent magnet 7 and the magnetic pole member 8 with a predetermined interval inside the chuck body 10. Yes.
doing.

  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 that of the adjacent reversible permanent magnet 7, and the upper portion of the magnetic pole member 8 is a hole in the chuck upper surface body 11. 11a and is 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 the adjacent main magnetic pole members 8 in the space formed by the main coil 9 and the chuck upper surface body 11, and the 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 magnetic pole members 8 are provided in a plurality of aligned states and are adjacent to each other with different polarities.

The plurality of auxiliary magnetic pole members 4 are prismatic bodies having the same size as the magnetic pole member 8, and are attached to the upper surface of the magnetic pole member 8 by, for example, mounting bolts 15, and the upper surface forms a chuck surface 4 a. In this way, the auxiliary magnetic pole member 4 and the main magnetic pole member 8 are integrated. The magnetic pole member 8, the chuck body 10, and the magnetic pole member 4 are made of a material having a large relative 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.

The frame body 3 has auxiliary coils 6 wound around each of the plurality of magnetic pole member insertion holes 13 having a grid pattern so that the frame body 3 fits into the plurality of magnetic pole members 4 and contacts the upper surface of the chuck upper surface body 11. Can be detachably combined. In this combined state, each auxiliary coil 6 corresponds to each magnetic pole member 4 and is closer to the work attracting surface, that is, the chuck surface 4a side than the constant-polarity permanent magnet 5 and the reversible permanent magnet 7, and on the chuck surface 4a side of the magnetic pole member 4. Is disposed around. As described above, the plurality of auxiliary coils 6 are supported by the frame 3 that is separable from the chuck main body 10, and the frame 3 is placed on the chuck main body 10, whereby each auxiliary coil 6 has its auxiliary magnetic pole member 4. Will be enclosed.

  The frame 3 is formed at a position corresponding to each magnetic pole member 4 using a material such as plastics, rubber, glass, ceramics, wax, or sponge (the surface is preferably formed into a film and has no holes). The plate-like member having the magnetic pole member insertion hole 13 is formed by a forming die, for example. At the time of molding, the wound auxiliary coil 6 is supported at a predetermined position of the insert mold, and is supported by the frame body 3 after molding and is positioned around the magnetic pole member insertion hole 13. 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 magnetic pole member 4 except when an elastically deformable member such as a sponge is used.

  Adjacent main coils 9 are wound in the same direction or in opposite directions, and are connected so that currents flow in opposite directions. The electric current for the main coil 9 is supplied from the main controller 18 through the connection line 16. Adjacent auxiliary coils 6 are wound in the same direction or in opposite directions, and are connected so that currents flow in the opposite directions. The electric current for the auxiliary coil 6 is supplied from the auxiliary control device 17 through the connection line 27 and the connection tool 28. The main controller 18 chucks the workpiece 12 by passing a current through the main coil 9 during the chucking operation. In addition, the auxiliary control device 17 causes a predetermined current to flow through the auxiliary coil 6 when the workpiece 12 is removed along with the chucking cancellation. The auxiliary control device 17 and the main control device 18 constitute the magnet chuck control device 2.

  6 and 7 show circuit diagrams of the auxiliary controller 17 and the main controller 18. 6 and 7, when an operator places a workpiece 12 made of a ferromagnetic material such as iron or nickel on the chuck surface 4a and turns on the operation switch 20 in the main controller 18 to start chucking, The main coil control circuit 24 in the main controller 18 chucks the workpiece 12 by causing a predetermined current to flow through the main coil 9. At this time, since a current flows so as to have a polarity as shown in FIG. 2, the magnetic flux of the reversible permanent magnet 7 and the magnetic flux from the constant polarity permanent magnet 5 are merged by the magnetic pole member 8 due to this current. To the magnetic workpiece 12. The magnetic flux that has reached the workpiece 12 returns to the original state from the adjacent magnetic pole member 4 and 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 to the chuck surface 4a and chucked (fixed). In this state, processing necessary for the workpiece 12 is performed.

  When the machining of the workpiece 12 is completed, the operator turns on the operation switch 21 to release chucking. As a result, the main coil control circuit 24 applies a predetermined current to the main coil 9 in the direction opposite to that during the chucking operation, and inverts the polarity of the reversible permanent magnet 7 as shown in FIG. At this time, 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 via the magnetic pole member 8 and the chuck body 10. Accordingly, the magnetic flux to the outside of the chuck surface 4a disappears, and the magnetic attraction to the work 12 is eliminated, so that 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 magnetic pole member 4. That is, a magnetic flux in the same direction as the magnetic flux generated by the magnetic pole member 4 and the magnetic pole member 8 during chucking remains on the work 12, and the work 12 is attracted to the chuck surface 4a even after chucking is released. As described above, during the chucking operation, the magnetic fluxes from the reversible permanent magnet 7 and the constant polarity permanent magnet 5 merge at the magnetic pole member 8, reach the work 12 from the magnetic pole member 4, pass through the work 12, and the adjacent magnetic pole member. However, due to this magnetic flux, the work 12 itself is magnetized (magnetic polarization), and a magnetic flux in the same direction as the magnetic flux from the chuck surface 4a is produced.

  As a result, the pole member facing surface of the workpiece 12 is magnetized with a polarity opposite to that of the chuck surface 4a. As a result, even if the magnetic field disappears due to the cancellation of chucking, the workpiece 12 maintains the magnetized state and retains the residual magnetism, and is attracted to the chuck surface 4a. The strength of the residual magnetism varies depending on the material and shape of the workpiece 12 and the processing history such as heat treatment and machining. Generally, a material that is hard and has a large residual magnetic flux density such as die steel is large, and a material that has a small residual magnetic flux density such as soft iron is small.

  The auxiliary control device 17 of FIGS. 6 and 7 eliminates the adverse effect of the residual magnetism of the work 12 by causing a current of a predetermined magnitude to flow through the auxiliary coil 6 after chucking is released, thereby chucking the work 12. It works so that it can be easily removed from the surface 4a. The auxiliary control device 17 in FIG. 6 functions to positively pull the workpiece 12 away from the chuck surface 4a by a magnetic repulsive force. On the other hand, the auxiliary control device 17 in FIG. 7 functions to demagnetize (demagnetize) the residual magnetism generated on the surface of the workpiece 12 facing the magnetic pole member.

  First, after the chucking is released, the auxiliary control device 17 in FIG. 6 causes the auxiliary coil 6 to flow a current having a predetermined magnitude and a predetermined direction, thereby causing the same as the residual magnetism generated on the surface facing the magnetic pole member of the workpiece 12. A magnetic field that is a polar magnetic field and is weaker than the intrinsic coercive force of the workpiece 12 is generated on the chuck surface 4a, and the workpiece 12 is pulled away from the chuck surface 4a by the magnetic repulsive force of the same polarity. For this reason, the auxiliary control device 17 of FIG. 6 includes an operation switch 19, a storage device 22, a calculation device 23, an auxiliary coil control circuit 25, and an input device 26. The arithmetic device 23 is provided inside the auxiliary coil control circuit 25.

  The worker uses the input device 26 in advance as the demagnetization information of the workpiece 12 according to the type of the workpiece 12 to be processed, for example, the intrinsic coercivity of the workpiece 12, the coercivity of the workpiece 12, and the intrinsic coercivity of the workpiece 12. At least one data of a current value that generates a magnetic force or a coercive force is input, and the data is stored in the storage device 22 via the auxiliary coil control circuit 24. In this manner, the storage device 22 stores the demagnetization information of the workpiece 12 corresponding to many types of workpieces 12 to be processed. As the demagnetization information of the workpiece 12, for example, the intrinsic coercivity of the workpiece 12 is stored. , At least one data of the coercive force of the workpiece 12 and the current value that causes the intrinsic coercive force or coercive force of the workpiece 12 is stored. Note that the items considered as the type of the workpiece 12 are specifically the material and size of the iron material or nickel material, that is, the weight, the shape of the portion of the workpiece 12 facing the magnetic pole member (for example, the cross-sectional area toward the magnetic pole member facing surface). Is a gradual decrease, gradual increase, or constant shape), machining history, heat treatment history, and the like. Further, as a method for obtaining the stored current value, for example, based on the type of the work 12, the intrinsic coercivity or coercivity of the work 12 is obtained experimentally and empirically. Furthermore, a current value that generates a magnetic field of the determined intrinsic coercivity of the workpiece 12 or a predetermined ratio of the coercive force, for example, 80% of the intrinsic coercive force and 100% of the coercive force is experimentally obtained.

  The operator specifies the type of the workpiece 12 to be machined by the input device 26 before or after machining the workpiece 12, and then performs an operation when removing the workpiece 12 due to chucking release after machining of the workpiece 12 is completed. The switch 19 is operated to give an auxiliary execution command to the auxiliary coil control circuit 25. At this time, the arithmetic device 23 in the auxiliary coil control circuit 25 obtains at least one data of the intrinsic coercive force corresponding to the type of the workpiece 12 to be processed, the coercive force, or the current value causing the intrinsic coercive force or coercive force. The demagnetization information of the work 12 is read from the storage device 22, and the current value to be passed through the auxiliary coil 6 is calculated from the read data and output, or the current value to be passed is directly output.

  Here, the auxiliary coil control circuit 25 causes a current to flow through the auxiliary coil 6, thereby generating a magnetic field having the same polarity as the residual magnetism generated on the surface facing the magnetic pole member of the work 12, which is weaker than the intrinsic coercivity of the work 12. A magnetic field is generated on the chuck surface 4a, and the work 12 is caused to separate from the chuck surface 4a by the magnetic repulsive force of the same polarity. The current at this time is a constant value of direct current, and is energized for a predetermined time required to remove the workpiece 12, for example, 5 seconds. In this way, the workpiece 12 can be removed from the chuck surface 4a with a small force by the magnetic repulsive force during the energization period even in the presence of residual magnetism.

  FIG. 8 is a schematic diagram of a magnetic hysteresis 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. In FIG. 8, 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. 9 shows a demagnetization curve of a certain workpiece 12 and corresponds to the second quadrant of the magnetic history curve in FIG.

  Here, the case of (1) and the case of (2) will be described based on the demagnetizing curve of FIG. (1) The magnetic field strength (magnetic field strength) by the auxiliary coil 6 is larger than 0 (absolute value), and the work magnetic flux density of the work 12 becomes 0 in the coercive force of the work 12 (coercive force: BH demagnetization curve). In the case of up to (magnetic field strength), the magnetic field (magnetic field) by the auxiliary coil 6 and the magnetic field (magnetic field) of the work 12 are repulsive because of the same polarity. As the magnetic field strength by the auxiliary coil 6 increases, the magnetic flux due to the magnetization (magnetic polarization) of the workpiece 12 itself decreases somewhat, but the repulsive force increases as the magnetic field strength by the auxiliary coil 6 increases. With the magnetic field strength of the coercive force of the work 12, the magnetic flux density on the surface of the work 12 facing the magnetic pole member becomes 0, that is, the magnetic flux generated by the magnetization (magnetic polarization) of the work 12 itself and the magnetic flux in the opposite direction by the auxiliary coil 6 antagonize. . With respect to the magnetic field strength of the coercive force, the magnetic fluxes in the opposite directions are antagonizing each other, so that the repulsive force is maximized before and after the magnetic field strength before and after the coercive force, and the workpiece 12 can be removed most easily. Furthermore, since the workpiece 12 is demagnetized at the magnetic field strength of the coercive force, adhesion of cutting iron powder or the like in the subsequent process can be suppressed. (2) The magnetic field strength (magnetic field strength) by the auxiliary coil 6 is larger than the coercive force of the work 12, and the work is magnetically polarized in the intrinsic coercivity of the work 12 (inherent coercive force: JH demagnetization curve). If the magnetic field intensity is smaller than 0, a repulsive force that is weaker than the repulsive force due to the coercive force is generated. Furthermore, since the workpiece 12 is demagnetized, it is possible to suppress adhesion of cutting iron powder or the like in a subsequent process.

  Next, after the chucking is released, the auxiliary control device 17 shown in FIG. 7 causes the auxiliary coil 6 to flow in a predetermined direction and in a predetermined direction, thereby causing the same amount of residual magnetism as that generated on the surface facing the magnetic pole member of the workpiece 12. A magnetic field that is the same as the intrinsic coercivity of the workpiece 12 is generated on the chuck surface 4a, and the residual magnetism generated on the surface of the workpiece 12 facing the magnetic pole member is demagnetized (demagnetized). For this reason, the auxiliary control device 17 in FIG. 7 has an operation switch 19, a storage device 22, a calculation device 23, an auxiliary coil control circuit 25, and an input device 26, like the auxiliary control device 17 in FIG. The arithmetic unit 23 is provided inside the auxiliary coil control circuit 25.

  The operator uses, for example, at least one of the intrinsic coercivity and the intrinsic coercive force of the workpiece 12 as demagnetization information of the workpiece 12 according to the type of the workpiece 12 to be processed via the input device 26 in advance. Data is input, and the input data is stored in the storage device 22 via the auxiliary coil control circuit 25. In this manner, the storage device 22 stores the demagnetization information of the workpiece 12 corresponding to many types of workpieces 12 to be processed. As the demagnetization information of the workpiece 12, for example, the intrinsic coercivity of the workpiece 12 is stored. And at least one data of a current value causing the intrinsic coercive force. As a method of obtaining the stored current value, for example, based on the type of the work 12, the intrinsic coercivity of the work 12 is obtained experimentally and empirically, and further, the current value that generates the magnetic field of the intrinsic coercive force is obtained experimentally. It is done.

  The operator specifies the type of the workpiece 12 to be machined by the input device 26 before or after machining the workpiece 12, and then performs an operation when removing the workpiece 12 due to chucking release after machining of the workpiece 12 is completed. The switch 19 is operated to give a demagnetization execution command to the auxiliary coil control circuit 25. At this time, the arithmetic device 23 reads out at least one data of the intrinsic coercivity corresponding to the type of the workpiece 12 to be processed and the current value causing the intrinsic coercivity from the storage device 22 as demagnetization information of the workpiece 12, The current value to be passed through the auxiliary coil 6 is calculated and output from the read data, or the current value to be passed is directly output.

  Here, the auxiliary coil control circuit 25 causes a current to flow through the auxiliary coil 6, thereby generating a magnetic field having the same polarity as the residual magnetism generated on the surface facing the magnetic pole member of the workpiece 12, and substantially the same as the intrinsic coercivity of the workpiece 12. Is generated on the chuck surface 4a, and the residual magnetism generated on the surface of the workpiece 12 facing the magnetic pole member is demagnetized (demagnetized). The current for demagnetization (demagnetization) is a constant direct current, and the work 12 is energized for a predetermined time required for demagnetization (demagnetization), for example, 0.5 seconds. This demagnetization (demagnetization) allows the workpiece 12 to be removed from the chuck surface 4a with a small force.

  Here, the force which acts on the workpiece | work 12 is demonstrated based on the demagnetization curve of FIG. Since the magnetic field strength (magnetic field strength) by the auxiliary coil 6 is substantially the same as the intrinsic coercive force of the workpiece 12, the magnetic polarization of the workpiece 12 is zero, that is, the magnetic flux due to the magnetization (magnetic polarization) of the workpiece 12 itself is zero. . Therefore, even if energization to the auxiliary coil 6 is stopped and the magnetic field is eliminated, the state where the magnetic flux is zero is maintained, that is, demagnetized. The workpiece 12 does not attract the chuck surface 4a and can be removed with a small force. Furthermore, since the workpiece 12 is demagnetized, it is possible to avoid adhesion of cutting iron powder or the like in a subsequent process.

  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 a single unit. However, when improving the existing permanent electromagnetic magnet chuck 1, Thus, the auxiliary magnetic pole member 4 is attached to the magnetic pole member 8. Further, the plurality of auxiliary coils 6 and the auxiliary magnetic pole member 4 may be supported by a frame 3 that can be separated from the chuck main body 10, and the plurality of auxiliary coils 6 and the auxiliary magnetic pole member 4 are connected to the chuck main body 10. It may be assembled in an inseparable state.

1 is a plan view of a permanent electromagnetic magnet chuck 1 according to the present invention. It is AA sectional drawing of FIG. 1 at the time of the chucking operation | movement of the permanent electromagnetic magnet chuck 1 which concerns on this invention. It is sectional drawing which shows a state when incorporating the frame 3 in the permanent electromagnetic magnet chuck 1 which concerns on this invention. 3 is a plan view of a frame body 3. FIG. 3 is a partial cross-sectional view of the permanent electromagnetic magnet chuck 1 according to the present invention when chucking is released. It is a block diagram of the magnet chuck control apparatus 2 by this invention. It is a block diagram of the magnet chuck control apparatus 2 by this invention. 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 magnet chuck 2 Magnet chuck control apparatus 3 Frame body 4 Magnetic pole member 4a Chuck surface 5 Constant polarity permanent magnet 6 Auxiliary coil 7 Reversible permanent magnet 8 Magnetic pole member 9 Main coil 10 Chuck body 11 Chuck upper surface body 11a Hole 12 Workpiece DESCRIPTION OF SYMBOLS 13 Magnetic pole member insertion hole 14 Mounting hole 15 Mounting bolt 16 Connection line 17 Auxiliary control device 18 Main control device 19 Operation switch 20 Operation switch 21 Operation switch 22 Memory | storage device 23 Arithmetic device 24 Main coil control circuit 25 Auxiliary coil control circuit 26 Input device 27 Connecting line 28 Connecting tool

Claims (3)

A constant polarity permanent magnet (5), a reversible permanent magnet (7) wound with a main coil (9), and a workpiece (12) in contact with the constant polarity permanent magnet (5) and the reversible permanent magnet (7) A permanent magnet magnet chuck (1) having a magnetic pole member (4, 8) having a chuck surface (4a) to be fixed, and a plurality of the magnetic pole members (4, 8) provided adjacent to each other with different polarities;
A plurality of auxiliary coils (6) disposed on the chuck surface (4a) side of the constant-polarity permanent magnet (5) and the reversible permanent magnet (7) corresponding to each magnetic pole member (4, 8) The magnetic field having the same polarity as the residual magnetism generated on the surface facing the magnetic pole member of the work (12) when the work (12) is removed when chucking is released by changing the polarity of the reversible permanent magnet (7). A permanent electromagnetic magnet chuck having an auxiliary control device (17) for controlling an electric current of an auxiliary coil (6) for generating a magnetic field weaker than an intrinsic coercive force of a workpiece (12) on a chuck surface (4a). (1). A constant polarity permanent magnet (5), a reversible permanent magnet (7) wound with a main coil (9), and a workpiece (12) in contact with the constant polarity permanent magnet (5) and the reversible permanent magnet (7) A permanent magnet magnet chuck (1) having a magnetic pole member (4, 8) having a chuck surface (4a) to be fixed, and a plurality of the magnetic pole members (4, 8) provided adjacent to each other with different polarities;
A plurality of auxiliary coils (6) disposed on the chuck surface (4a) side relative to the constant polarity permanent magnet (5) and the reversible permanent magnet (7) corresponding to each magnetic pole member (4, 8), and reversible After canceling chucking by changing the polarity of the permanent magnet (7), the magnetic field is the same as the residual magnetism generated on the surface facing the magnetic pole member of the work (12) and is substantially the same as the intrinsic coercivity of the work. A permanent electromagnetic magnet chuck (1) having an auxiliary control device (17) of an auxiliary coil (6) for generating a magnetic field on the chuck surface (4a).   The auxiliary control device (17) includes a storage device (22) and an arithmetic device (23), and the storage device (22) stores demagnetization information of the workpiece (12) corresponding to the type of the workpiece (12). The arithmetic unit (23) reads the demagnetization information corresponding to the input workpiece (12) or the workpiece (12) similar to the input workpiece (12) from the storage device (22), and reduces the demagnetization information. 3. The permanent electromagnetic magnet chuck (1) according to claim 1 or 2, wherein a current value to be passed through the auxiliary coil (6) is output based on magnetic information.

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