JP6364056B2 - Permanent electromagnetic magnet chuck with support member - Google Patents

Description

  The present invention relates to a permanent electromagnetic magnet chuck with a support member.

An electromagnetic magnet chuck with a support member is known (Patent Document 1).
The electromagnetic magnet chuck with a support member shown in Patent Document 1 has a magnetic pole member made of a magnetic material having a suction surface for attracting a magnetic workpiece, and in which a plurality of electromagnetic coils are embedded in a required arrangement, and hydraulically. A plunger that protrudes and protrudes outward from the attracting surface of the magnetic pole member has a plunger that contacts the surface of the workpiece, and is fixed in a hole provided in the magnetic pole member surrounded by each electromagnetic coil A plurality of support members.

  Each support member is movably provided in the housing with a first spring interposed between the housing and a piston that moves against the urging force of the first spring by hydraulic pressure, and the piston And a plunger that is movably provided in the housing with a second spring interposed between the piston and a piston that moves together with the piston.

By energizing the electromagnetic coil, a magnetic force is generated on the attracting surface of the magnetic pole member, and the work can be attracted to the attracting surface. On the other hand, by the hydraulic pressure, each piston is moved against the biasing force of the first spring, whereby each plunger moves together with the piston, each plunger comes into contact with the surface of the workpiece, and still when the piston moves, While each plunger is in contact with the workpiece, the piston enters the plunger so as to compress the second spring. Thus, the workpiece is attracted to the suction surface in a state where each plunger is in contact with the surface of the workpiece with a constant pressing force.
According to this electromagnetic magnet chuck with a support member, since the plunger is in contact with and supported by the surface of the workpiece, it is possible to satisfactorily attract the workpiece whose surface forms an uneven surface.

JP 2009-255221 A

By the way, since what is shown by patent document 1 is an electromagnet-type magnet chuck, there exists a subject that a large electric current is required and power consumption is large.
Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide a permanent electromagnetic magnet chuck with a support member that can reduce power consumption and suppress oil (fluid) leakage as much as possible. To do.

In order to achieve the above object, the present invention comprises the following arrangement.
That is, the permanent electromagnetic magnet chuck with a support member according to the present invention is provided with a permanent magnet disposed in a storage hole provided in a base plate made of a magnetic material, and covers the permanent magnet to attract the workpiece. A magnetic pole member having an adsorption surface and having an electromagnetic coil embedded therein, a separator provided on the adsorption surface of the magnetic pole member so as to surround the adsorption area exerted by the electromagnetic coil, and protruding by fluid pressure A plurality of plungers disposed in holes provided in the magnetic pole member at a portion surrounded by the electromagnetic coil, the plunger contacting the surface of the workpiece when protruding outward from the attraction surface of the magnetic pole member; The support member, the base plate, the partition portion for partitioning the storage hole provided in the base plate, and the magnetic pole member are passed through to the support member and fluid pressure is applied to the plunger. And the boss fluid path, in the fluid path, characterized by comprising a seal member for sealing between said pole members and said partitioning portion.

A part of the magnetic pole member that directly covers the electromagnetic coil is separately formed as an assembly core part, and the seal member seals between the partition part and the assembly core part in the fluid path. 1 seal member, and a second seal member that seals between the assembled iron core and the magnetic pole member.
The seal member may be an O-ring.

  Each of the support members, and a piston that is movable in the housing with a first spring interposed between the housing and that moves against the biasing force of the first spring by fluid pressure; It can be comprised with the said plunger etc. which are located in the outer side of this piston, are provided in the housing so that a 2nd spring is interposed between this piston, and move with the said piston.

Provided on the surface of the magnetic pole member is a groove that communicates with the hole provided in the magnetic pole member and that opens on a side surface of the magnetic pole member and discharges the cutting or grinding waste of the workpiece and the machining fluid. it can.
The concave groove can be formed in a concave groove having an inverted T-shaped cross section.
A degaussing coil can be disposed on the magnetic pole member.
The permanent magnet may be a magnet made of a magnetic material having a low magnetic force and a high magnetic flux density, such as an alnico magnet.
In addition to the permanent magnet, a rare earth magnet can be disposed on the magnetic pole member.

According to the present invention, the connection block is eliminated, the permanent magnet is disposed in the storage hole provided in the base plate, and the oil passage (fluid path) is provided through the partition between the storage holes. The seal member that seals between the base plate and the connection block can be eliminated, so that oil (fluid) leakage can be reduced. In addition, the seal member that becomes the deepest part from the suction surface side is eliminated, making repairs easy. The effect which becomes. Further, it is possible to provide a permanent electromagnetic magnet chuck with a support member that can keep power consumption low.

It is sectional drawing of a permanent electromagnetic magnet chuck with a support member. It is sectional drawing of a support member. It is a partial top view of the improved permanent electromagnetic magnet chuck with a support member. It is the YY sectional view taken on the line in FIG. It is the XX sectional view taken on the line in FIG. It is sectional drawing at the time of an electromagnetic coil OFF of the permanent electromagnetic magnet chuck with a support member which further provided the rare earth magnet. It is sectional drawing at the time of electromagnetic coil ON of the permanent electromagnetic magnet chuck with a support member which further provided the rare earth magnet. It is sectional drawing at the time of an electromagnetic coil OFF of the permanent electromagnetic magnet chuck with a support member which further provided the degaussing coil. It is sectional drawing at the time of electromagnetic coil ON of the permanent electromagnetic magnet chuck with a support member which further provided the degaussing coil.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
A permanent electromagnetic magnet chuck in which a permanent magnet and an electromagnetic coil are combined is known (for example, Japanese Patent Application Laid-Open No. 2005-305565). In the case of this permanent electromagnetic type magnet chuck, a reversible permanent magnet is used, and the magnetic force that appears on the attracting surface of the reversible permanent magnet is controlled by the electromagnetic coil. Can be saved.
Therefore, the inventor has conceived that a permanent magnet is also incorporated into the electromagnetic magnet chuck with a support member disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2009-255221) to save labor, and the support member as shown in FIG. Attached permanent electromagnetic magnet chuck 10 was devised.

First, the permanent electromagnetic magnet chuck 10 with a support member will be described with reference to FIGS. FIG. 1 is a sectional view of a permanent electromagnetic magnet chuck 10 with a support member, and FIG. 2 is a sectional view of a support member 30.
A plurality of alnico permanent magnets 14 are arranged on a base plate 12 made of a magnetic material, and a stainless steel connection block 16 is arranged between the permanent magnets 14. The permanent magnet 14 and the connection block 16 are covered with an assembly iron core 18 made of a magnetic material. The connection block 16 is fixed to the base plate 12 with bolts 19. The connection block 16 may be an alnico magnet.

A magnetic pole member 20 made of a magnetic material is disposed on the assembled iron core 18. The assembled iron core 18 can be integrated with the magnetic pole member 20.
The surface side of the magnetic pole member 20 is an adsorption surface. A long ring-shaped hole 22 is opened on the surface of the magnetic pole member 20 on the assembly core 18 side, and an electromagnetic coil 24 is disposed in the long ring-shaped hole 22. The hole 22 is filled with epoxy resin to seal the electromagnetic coil 24.

A separator 26 made of a non-magnetic material is provided on the suction surface of the magnetic pole member 20 so as to surround the suction area exerted by the electromagnetic coil 24.
A plurality of holes 28 having a large diameter portion on the suction surface side are opened in a row at a required interval in a portion surrounded by the electromagnetic coil 24 of the magnetic pole member 20. A support member 30 is disposed so as to fit into the small diameter portion of each hole 28. The upper part of the support member 30 is exposed in the large diameter part. A plurality of such rows of support members 30 are provided as appropriate (not shown).

The support member 30 has a plunger 32 that protrudes by fluid pressure such as hydraulic pressure or pneumatic pressure (hereinafter described as hydraulic pressure) and contacts the surface of the workpiece when protruding outward from the adsorption surface of the magnetic pole member 20.
The large diameter portion of each hole 28 is covered with a lid 34. The lid 34 is fixed to the magnetic pole member 20 by screws 35. An opening 36 is formed in the lid 34, and the plunger 32 can project from the suction surface through the opening 36. A drain hole 42 penetrating the magnetic pole member 20, the assembled iron core 18, the connection block 16, and the base plate 12 is provided at the bottom of the large diameter portion of the hole 28.
The reason why the hole 28 is covered with the lid 34 is to prevent cutting waste, grinding waste and the like from entering the hole 28. The machining fluid or the like that has entered the hole 28 from the opening 36 provided in the lid 34 is discharged from the drain hole 42 to the outside.

An oil passage (fluid passage) 38 that passes through the base plate 12, the connection block 16, the assembled iron core 18 and the magnetic pole member 20 and reaches the support member is provided, and pressure oil is supplied to and discharged from the support member 30 through the oil passage 38. As a result, the plunger 32 can protrude from the main body of the support member 30.
In the oil passage 38, the seal member is provided at three locations between the base plate 12 and the connection block 16, between the connection block 16 and the assembly iron core 18, and between the assembly iron core 18 and the magnetic pole member 20. A ring 40 is provided.

Although the structure of the support member 30 is not particularly limited, the structure shown in FIG. 2 is used in the present embodiment.
That is, the support member 30 is provided so as to be movable in the housing 44 with the first spring 43 interposed between the housing 44 and the housing 44, and the first spring 43 is attached by the hydraulic pressure from the oil passage 38. A piston 45 that moves against the force, and a second spring 46 that is located outside the piston 45 and is interposed between the piston 45 and is movable in the housing 44, and moves together with the piston 45. And a possible plunger 32. Reference numeral 47 denotes a guide cylinder for guiding the movement of the plunger 32.

  When pressure oil is supplied to the oil passage 38, the piston 45 moves, and accordingly, the plunger 32 protrudes upward from the lid body 34, and the tip of the plunger 32 comes into contact with the workpiece. By the first spring 43 and the second spring 46, the plunger 32 comes into contact with the workpiece with a required pressing force.

In order to attract and hold a work (not shown) using the permanent electromagnetic magnet chuck 10 with a support member shown in FIGS. 1 and 2, the following is performed.
First, the work is placed on the suction surface of the magnetic pole member 20.
Next, pressure oil is supplied from a hydraulic source (not shown) to the oil passage 38, and each plunger 32 is protruded from the suction surface by hydraulic pressure, and the tip of the plunger 32 is brought into contact with the work so as to support the work.
In this state, large electric power necessary for the electromagnetic coil 24 is supplied, a strong magnetic force is generated on the attracting surface, and the work is attracted and fixed to the attracting surface.
In this state, necessary cutting and grinding are performed on the workpiece.

Note that the Alnico permanent magnet 14 can continuously obtain the necessary magnetic force by simply energizing the electromagnetic coil 24 for a short time, thereby saving energy.
In order to release the work after the work has been processed, the magnetic force of the Alnico permanent magnet 14 having a small holding power may be reduced by energizing the electromagnetic coil 24 in the direction opposite to that during the adsorption.
If necessary, a degaussing coil for demagnetizing the residual magnetic force remaining on the workpiece may be provided (not shown).

As described above, the permanent electromagnetic magnet chuck 10 with a support member that can save energy can be provided.
However, the following problems also occurred in the permanent electromagnetic magnet chuck 10 with a support member according to the embodiment shown in FIG.
That is, as described above, the oil passage (fluid passage) 38 through which pressure oil is supplied to the support member 30 passes through the base plate 12, the connection block 16, the assembled iron core 18, and the magnetic pole member 20, and reaches the support member. An oil passage (fluid passage) 38 is used.

In the oil passage 38, the seal member is provided at three locations between the base plate 12 and the connection block 16, between the connection block 16 and the assembly iron core 18, and between the assembly iron core 18 and the magnetic pole member 20. A ring 40 is provided to seal between the members.
However, as described above, sealing between three locations with an O-ring tends to be incomplete and may cause oil leakage. And the problem that the repair in case of an oil spill is troublesome arises.

Therefore, in the following embodiment, the above embodiment is further improved to avoid oil (fluid) leakage as much as possible, and even if oil (fluid) leakage occurs, it is easy to repair, and the permanent member with a support member is attached. An electromagnetic magnet chuck 10 is provided.
3 to 5 show the improved permanent electromagnetic magnet chuck 10 with a support member, FIG. 3 is a partial plan view thereof, FIG. 4 is a sectional view taken along line YY in FIG. 3, and FIG. It is XX sectional drawing.
The same members as those in the embodiment in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof is omitted.

A feature of the improved embodiment is that the connection block 16 is eliminated and the permanent magnet 14 made of alnico magnet is disposed in the storage hole 15 provided in the base plate 12 and the partition portion 12a (base) between the storage holes 15 is provided. The oil passage (fluid passage) 38 is provided through the plate 12).
Then, the seal member 40 is sealed between the partitioning portion 12a and the assembled iron core 18 in the fluid path 38, and the second seal is sealed between the assembled iron core 18 and the magnetic pole member 20. Two sealing members were used. If the assembled iron core 18 and the magnetic pole member 20 are integrated, the sealing member can be only one sealing member that seals between the partition portion 12a and the magnetic pole member 20.

That is, in this embodiment, since the sealing member for sealing between the base plate 12 and the connection block 16 in the embodiment shown in FIGS. 1 and 2 is eliminated, oil (fluid) leakage can be reduced accordingly. Moreover, there is an advantage that repair is easy by eliminating the seal member that is the deepest part from the suction surface side.
In FIG. 5, 48 is a glass bead disposed in the hole 22 for accommodating the electromagnetic coil 24 in order to improve insulation, and 49 is an epoxy resin for sealing the electromagnetic coil 24 and the like. .

A further desired improvement in the improved electromagnetic permanent magnet chuck 10 with a support member is that the lid 34 and the drain hole 42 are eliminated and a concave groove 50 serving as a drain groove is formed on the attracting surface of the magnetic pole member 20. (Note that this improvement is not necessarily provided).
As shown in FIG. 3, the recessed groove 50 opens on the side surface of the magnetic pole member 20 and communicates with the large diameter portion 28 a of the hole 28 through the passage 51. As a result, cutting waste, grinding waste, machining fluid and the like that have entered the large-diameter portion 28 a of the hole 28 are discharged to the side of the magnetic pole member 20 through the passage 51 and the groove 50.

A seal member 52 is disposed between the large-diameter portion 28a of the hole 28 and the support member 30, thereby preventing the processing liquid from entering the portion.
According to this improved type, since the lid 34 and the drain hole 42 are eliminated, the configuration can be simplified.
Further, if the concave groove 50 is formed to have an inverted T-shaped cross section, the concave groove 50 can be used as a locking groove for attaching a processing tool.
Furthermore, as shown in FIG. 3, the concave groove 50 serving as a space portion can be used as a separator portion in combination with the separator 26 made of a nonmagnetic material.

In the permanent electromagnetic magnet chuck 10 with the support member in each of the above embodiments, one kind of permanent magnet 14 made of an alnico magnet is used, but the present invention is not limited to this.
6 and 7 show a structure in which a rare earth magnet 54 made of ferrite is disposed immediately above the electromagnetic coil 24. In addition, the same member as the said embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description.
FIG. 6 shows when the electromagnetic coil 24 is OFF, and the magnetic path forms a closed circuit as indicated by an arrow. FIG. 7 shows a magnetic path as indicated by an arrow when the electromagnetic coil is ON, and N and S poles appear on the attracting surface.

8 and 9 are the ones in which a demagnetizing coil 56 is further provided in addition to those in FIGS. The same members as those in the above embodiment are given the same reference numerals.
FIG. 8 shows when the electromagnetic coil 24 is OFF, and the magnetic path forms a closed circuit as indicated by an arrow. FIG. 9 shows a magnetic path as indicated by an arrow when the electromagnetic coil is ON, and N and S poles appear on the attracting surface.

  10 Permanent electromagnetic magnet chuck with support member, 12 Base plate, 14 Permanent magnet, 15 Housing hole, 16 Connection block, 18 Assembly iron core, 20 Magnetic pole member, 22 holes, 24 Electromagnetic coil, 26 Separator, 28 holes, 28a Large Diameter portion, 30 Support member, 32 Plunger, 34 Lid, 36 Opening portion, 38 Oil passage (fluid passage), 40 Seal member, 42 Drain hole, 43 First spring, 44 Housing, 45 Piston, 46 Second Spring, 47 Guide tube, 48 Glass beads, 49 Epoxy resin, 50 Concave groove, 51 Passage, 52 Seal member, 54 Rare earth magnet, 56 Degaussing coil

Claims (9)

A permanent magnet disposed in a storage hole provided in a base plate made of a magnetic material;
A magnetic pole member provided so as to cover the permanent magnet, having an attracting surface for attracting a workpiece, and having an electromagnetic coil embedded therein;
A separator provided on the attraction surface of the magnetic pole member so as to surround an attraction area exerted by the electromagnetic coil;
In a hole provided in the magnetic pole member at a portion surrounded by the electromagnetic coil, having a plunger that comes into contact with the surface of the workpiece when protruding by fluid pressure and protrudes outward from the adsorption surface of the magnetic pole member A plurality of support members arranged in
A fluid path that passes through the base plate, a partition portion that partitions the storage hole provided in the base plate, and the magnetic pole member, reaches the support member, and exerts fluid pressure on the plunger;
A permanent electromagnetic magnet chuck with a support member, comprising: a seal member that seals between the partition portion and the magnetic pole member in the fluid path.   A part of the magnetic pole member that directly covers the electromagnetic coil is formed as a separate assembly core part, and the seal member seals between the partition part and the assembly core part in the fluid path. 2. The permanent electromagnetic magnet chuck with a support member according to claim 1, which is a first seal member and a second seal member that seals between the assembled iron core and the magnetic pole member.   The permanent electromagnetic magnet chuck with a support member according to claim 1 or 2, wherein the seal member is an O-ring.   Each of the support members includes a housing and a piston that is movably provided in the housing with a first spring interposed between the housing and that moves against the urging force of the first spring by fluid pressure, 2. The apparatus according to claim 1, further comprising: a plunger positioned outside the piston and movably provided in the housing with a second spring interposed between the piston and the plunger that moves together with the piston. A permanent electromagnetic magnet chuck with a support member according to any one of? 3.   Provided on the surface of the magnetic pole member, communicating with the hole provided in the magnetic pole member, and having a concave groove for discharging work cutting waste or grinding waste and machining fluid, which is opened on a side surface of the magnetic pole member. The permanent electromagnetic magnet chuck with a support member according to any one of claims 1 to 4.   6. The permanent electromagnetic magnet chuck with a support member according to claim 5, wherein the groove is a groove having an inverted T-shaped cross section.   The permanent electromagnetic magnet chuck with a support member according to any one of claims 1 to 6, further comprising a degaussing coil embedded in the magnetic pole member.   The permanent magnet magnet chuck with a support member according to claim 1, wherein the permanent magnet is a magnet made of a magnet material having a low holding force and a high magnetic flux density.   The permanent electromagnetic magnet chuck with a support member according to claim 1, further comprising a rare earth magnet embedded in the magnetic pole member separately from the permanent magnet.