JP2631886B2 - Magnetic forming rotary press - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a rotary press apparatus for press-molding a molded body in a die set on a turntable, and more specifically, to a ferromagnetic material in a magnetic field. The present invention relates to a magnetic field forming rotary press device for manufacturing magnets by molding.

[Prior Art] As a means for improving the magnetic properties of a permanent electromagnet, a mold is filled with a ferromagnetic material powder, and a magnetic field is formed in the mold so that the axis of easy magnetization of the ferromagnetic material powder is increased. A method has been practiced in which the ferromagnetic material powder is oriented in the direction of the magnetic field, and the ferromagnetic material powder is pressed and molded in this state.

As an apparatus for continuously and efficiently performing such a magnetic field forming operation, a magnetic field forming rotary press as shown in FIG. 5 has been conventionally used. An outline of this magnetic field forming rotary press will be described below. A pipe through-hole that is opened at regular intervals on a concentric circle near the circumference of a disk-shaped turntable 1 that is horizontally installed so as to rotate intermittently is formed. Are provided. Rotating frames 11, 11 which rotate in synchronization with the turntable 1 are arranged above and below the turntable 1, and press mechanisms 3, 5 mainly composed of hydraulic cylinders are fixed to the rotating frames 11, 11, respectively. The press mechanisms 3 and 5 are arranged opposite to each other so as to sandwich the die 2 up and down. At the tips of the plungers 4 and 6, an upper die and a lower die are formed, respectively. The holes are inserted through the upper and lower openings of the hole. A pair of electromagnets 7, 7 for forming a magnetic field are fixedly arranged at a specific work station where the dies 2 are stopped so as to sandwich the stopped dies 2 from above and below. It has a through hole through which the plungers 4 and 6 of the press mechanisms 3 and 5 are inserted. Further, a feeder 12 for supplying an appropriate amount of the ferromagnetic material powder into the die 2 is disposed beside the turntable 1.

The procedure for forming a ferromagnetic material in a magnetic field using this conventional magnetic field forming rotary press device is as follows.

As shown in FIG. 5, when the turntable 1 and the rotating frames 11, 11 are stopped, first, the plunger 6 of the lower press mechanism 5 is raised, and the tip of the plunger 6 penetrates through the electromagnet 7 to reach the bottom of the die 2. Insert shallow enough to close. Next, a predetermined amount of ferromagnetic material powder is supplied from the feeder 12 into the die 2, and the feeder 12 retreats.

Next, the plunger of the upper press mechanism 3 descends, and the leading end of the plunger penetrates the electromagnet 7 and is inserted into the plunger 2. Here, a direct current flows through the electromagnets 7, 7, and a magnetic field is formed in the through holes of the die 2. Then, the axis of easy magnetization of the ferromagnetic material powder in the die 2 is simultaneously oriented in the direction of the magnetic field, that is, vertically in FIG. In this state, the plunger 4 of the press mechanism 3 further moves down to compress and mold the ferromagnetic material powder in the die 2.
Thereafter, a direct current in the opposite direction is applied to the electromagnets 7, 7 to demagnetize the molded body.

Thereafter, the plunger 6 of the lower press mechanism 5 moves up,
The molded body is extruded to the upper surface of the turntable 1 and is taken out of the turntable 1 by a discharge mechanism (not shown).

[Problems to be Solved by the Invention] The above-mentioned molding process is performed sequentially while being distributed to a plurality of workstations. Ideally, the cycle time at each workstation is equal. However, in the above-mentioned conventional magnetic field forming press, the electromagnets 7 for forming a magnetic field in the die 2 do not rotate together with the turntable 1 but are fixed at one place. This is because it cannot be moved together with the turntable 1 due to the connection with the power supply device because of supplying a large amount of electric power to the electromagnets 7 and 7.

As a result, the process of applying a magnetic field to the ferromagnetic material powder supplied into the die 2 to mold and demagnetize the ferromagnetic material powder,
This must be done at one workstation where the electromagnets 7, 7 are located. That is, the main steps of all the steps of the magnetic field molding are concentrated on one workstation where the electromagnets 7 and 7 are installed. Therefore, the cycle time inevitably becomes extremely longer than the cycle times of other workstations. Therefore, 1
The time required to mold two moldings is limited by the cycle time of the above workstation, so that the production efficiency is not improved, and the advantages of the process distribution and the simultaneous parallel execution, which are the inherent advantages of the rotary press, are obtained. I can't.

Further, as shown in FIG. 7, the conventional magnetic rotary press shown in FIG. 5 has a cylindrical shape, a disk shape, a cylindrical shape,
This is one in which the axis of easy magnetization of the magnetic particles is oriented in the direction of the center axis of an electromagnet such as a ring. However, as shown in FIG. 6, when molding a so-called polar anisotropic electromagnet in which the axis of easy magnetization is oriented in the radial direction with respect to these central axes, it is necessary to surround the through hole which is a molding space of the die. A plurality of magnetic poles of the electromagnet must be arranged alternately at a certain angle. For this reason, in the above rotary press device in which the dice is set on the turntable and rotates together with the turntable, the connection between the electromagnet and the power source cannot be established. For this reason, when molding the polar anisotropic electromagnet, it is necessary to use a press in which the dies are fixed, and it has been difficult to obtain high productivity.

The present invention solves the above-mentioned problems in the conventional magnetic field forming press apparatus, and makes it possible to equalize the cycle time by dispersing the process of each workstation, and to form a magnetic anisotropic electromagnet. It is an object to provide a press device.

[Means for Solving the Problems] That is, in order to achieve the above object, the gist of the means adopted in the present invention is that a plurality of dies 2, 2,... An intermittently rotatable turntable 1 and upper and lower press mechanisms 3, which are disposed above and below a stop position of the dies 2, 2,... And have plungers 4, 6, respectively inserted into the dies 2, 2,. 5 and an electromagnet 7 having at least one pair of magnetic poles disposed to face each other with the through holes of the dies 2, 2,.
And a magnet-side contact 9 connected to the electromagnet 7 and moving together with the electromagnets 7 and 8; And a power supply side contact 8 that is connected to the power supply 10 and that reciprocates between the contact 9 and a position in contact with a position away from the contact 9 in synchronization with movement and stop of the electromagnet 7. This is a rotary press machine for forming a magnetic field.

[Operation] In the magnetic rotary press of the present invention, since the electromagnets 7 and 7 move together with the turntable 1, the process of forming a magnetic field in the dies 2 and 2 is performed not only at one workstation but also at a plurality of workstations. It can be arbitrarily allocated to workstations. When the electromagnets 7 and 8 stop at the work station, the power supply side contact 8 comes into contact with the magnet side contact 9 that moves with the electromagnets 7 and 8, and the electromagnets 7 and 7 are connected to the power supply 10. As a result, a current flows through the electromagnets 7, 7 to be excited, and a magnetic field is applied to the dies 2, 2, ... stopped at the workstation.

Further, the electromagnets 7 and 7
The magnetic pole can be arranged so as to surround the through hole of the die installed in the work station 1.

[Example] Next, an example of the present invention will be specifically described with reference to the drawings.

FIGS. 1 to 3 show an embodiment in which the present invention is applied to the molding of a polar anisotropic electromagnet as shown in FIG. Where the fifth
In the figure, the same parts as those of the conventional magnetic rotary press described above are denoted by the same reference numerals.

Here, the electromagnets 7, 7,... Are not arranged in a pair above and below the dies 2, 2,... As in the above-described conventional magnetic rotary press, but as shown in FIG. Are arranged at equal angular intervals so as to surround the through holes of the dies 2, 2,..., And the magnetic poles formed at the tips of the yokes S, N along the circumferential direction of the through holes. The magnets are alternately excited. As a result, a plurality of pairs of magnetic poles that face each other with the through hole of the die interposed therebetween are formed. The electromagnets 7, 7,... Are connected to magnet-side contacts 9, 9, which are provided on the peripheral surface of the turntable 1 at positions corresponding to the dies 2, respectively. In the illustrated embodiment, as shown in FIGS. 2 and 3, unitized dies 2, 2,... Are fitted and fixed in through holes 13 formed in the peripheral surface of the turntable 1. The electromagnet 7 is connected to the contacts 14, 14 provided on the peripheral surface of the die 2, and the contact provided on the peripheral surface of the pipe hole 13.
The magnet-side contacts 9 are connected to 15 and 15, and when the dies 2 are fitted into the tube through holes 13, the contacts 14 and 15 come into contact, whereby the electromagnet 7 is connected to the magnet-side contacts 9.

On the other hand, toward the peripheral surface of the turntable 1, the dies 2,
Power supply side contacts 8, 8 corresponding to the magnet side contacts 9, 9 are provided at the workstation where 2 ... stops.
The power supply-side contacts 8, 8 are attached to an insulating plate 16, and the insulating plate 16 has a buffer mechanism 17 for buffering an impact.
Is attached to a drive mechanism 18 such as an air cylinder through the drive table 18.
Is reciprocated back and forth toward the circumference of. The power supply contacts 8 are connected to a power supply 10. Thus, when the die 2 is stopped at the workstation, the power-supply-side contacts 8, 8 move forward, and this is the magnet-side contacts 9, 9
Are connected to the power source 10 to be excited, and a magnetic field is generated in the dies 2, 2,.

In the embodiment shown in FIG. 1, rotating frames 11 and 11 are arranged above and below the turntable 1, and two press mechanisms 3 and 5 are attached to each of them. The press mechanisms 3 and 5 facing up and down are disposed so as to sandwich the die 2 therebetween, and the plungers 4 and 6 are inserted into the die 2 from above and below, respectively.

In the magnetic field rotary press, the standard steps when four workstations are used are as follows. Since there are four workstations, the turntable rotates intermittently at 90 ° intervals in the direction of the arrow, and the dies 2, 2... Sequentially move and stop each workstation.

With the turntable 1 stopped at the position shown in FIG. 1, first, at the workstation at the far right in FIG. 1, the plunger 6 of the lower press mechanism 5 (not shown) rises, Insert shallowly to cover the bottom. Thereafter, the feeder 12 is driven to supply the ferromagnetic material powder into the die 2, and thereafter, the feeder 12 retreats.

At the right workstation in FIG. 1, which is the next workstation, the operation of the drive mechanism 18 causes
The insulating plate 16 is advanced, and its power-side contacts 8, 8
The magnet contacts the magnet-side contacts 9 attached to the peripheral surface of the turntable 1. Thus, the electromagnets 7 are connected to the power supply 10. As a result, the electromagnets 7, 7 arranged so as to surround the through holes of the die 2 are excited, and the magnetic poles formed at the tips of these yokes are magnetized alternately by S and N. , A magnetic field is formed. continue,
The plunger 4 of the upper press mechanism 3 is lowered, and the ferromagnetic material powder in the die 2 is compressed and molded in the magnetic field.
Thereafter, the operation of the drive mechanism 18 causes the power-side contacts 8, 8 to separate from the magnet-side contacts 9, 9. In addition, the power supply side contacts 8, 8
When the magnet and the magnet contacts 9 and 9 come into contact with each other, the impact is applied to the impact mechanism 16
Buffered.

1, the power supply side contacts 8, 8 are brought into contact with the magnet side contacts 9, 9 by the operation of the drive mechanism 18, and the electromagnet 7 , 7,..., A current flows in a direction opposite to that of the right front workstation in FIG. As a result, a magnetic field in the direction opposite to that in the previous step is formed in the die 2, and the molded body in the die 2 is demagnetized.
Thereafter, the operation of the drive mechanism 18 causes the power-side contacts 8, 8 to separate from the magnet-side contacts 9, 9.

At the leftmost workstation in FIG. 1, which is the next workstation, the plunger of the upper press mechanism (not shown) rises, and the plunger of the lower press mechanism (also not shown) rises to remove the molded body. Dice 2
Push up to the top of. Then, the molded body is removed from the magnetic field forming rotary press by a discharge mechanism (not shown).

At each workstation, these operations proceed simultaneously, and when each of them is completed, the turntable 1 and the rotating frames 11, 11 simultaneously rotate 90 °, and the same operation is repeated at each workstation. In this way, one ferromagnetic powder material is formed for each cycle. However,
The distribution of the processes to the workstations is merely an example, and in actuality, the processes are appropriately distributed so that the cycle time of the processes in the workstations is as uniform as possible. Therefore, if the number of workstations is changed, it is needless to say that the process allocation also changes.

The embodiment shown in FIG. 4 is a magnet in which the axis of easy magnetization of the magnetic particles is oriented in the direction of the central axis of the columnar magnet as shown in FIG. 7, similarly to the magnetic field forming rotary press shown in FIG. The present invention is applied to a magnetic field forming rotary press for forming a sheet.

In this embodiment, the electromagnets 7, 7 arranged above and below the dice are fixed to the rotating frames 11, 11, and are rotated together with the press mechanisms 3, 5. Then, the magnet contacts 9, 9 are attached to the shield cases of the electromagnets 7, 7 in an insulated state, and are connected to and separated from the magnet contacts 9, 9 by a drive mechanism 18 at each work station.
The power supply side contacts 8, 8 connected to 10 are arranged.

The pressing operation of this apparatus is substantially the same as the embodiment shown in FIGS.

[Effects of the Invention] As described above, according to the magnetic forming rotary press of the present invention, the step of placing the dice in the magnetic field can be distributed to a plurality of workstations without being concentrated on one workstation. The processes can be arbitrarily allocated so that the cycle time of the workstation becomes equal. In addition, since it is possible to arrange the magnets so as to surround the through holes of the dies installed on the rotating turntable, molding of a so-called polar anisotropic magnet, which was conventionally impossible, can be easily performed by the rotary press method. Be able to do it.

Therefore, an excellent effect that the productivity of the magnetic field molding can be improved can be obtained.

[Brief description of the drawings]

FIG. 1 is a half sectional perspective view showing only a main part of a magnetic field forming rotary press showing an embodiment of the present invention, FIG. 2 is an enlarged half sectional perspective view of a main part of the magnetic field forming rotary press,
FIG. 4 is an enlarged cross-sectional plan view of essential parts of the magnetic field forming rotary press. FIG. FIGS. 6 and 7 are perspective views showing an example of a molded magnet, showing only a main part of a conventional example of a press, and FIGS. 6 and 7. FIG. 1 turntable 2 dies 3 5 press mechanism 4 6 press mechanism plunger 7 electromagnet 8 power supply side contact 9 magnet side contact 10 …Power supply

Claims (1)

(57) [Claims] 1. An intermittently rotatable turntable 1 having a plurality of dies 2, 2,... Provided with through holes, which are molding spaces opened up and down, and arranged above and below a stop position of the dies 2, 2,. And upper and lower press mechanisms 3, 5 having plungers 4, 6 inserted into the dies 2, 2,... Respectively from above and below, and a pair or more arranged opposite to each other with the through holes of the dies 2, 2,. And an electromagnet 7 having the following magnetic poles, the electromagnet 7 is composed of a movable electromagnet that is moved together with the turntable 1, is connected to the electromagnet 7, and is connected to the electromagnets 7, 8.
The magnet-side contact 9 that moves together with the electromagnet 7 and the position that is installed at the stop position of the electromagnet 7 and connected to the power source 10 and that comes into contact with a position separated from the contact 9 in synchronization with the movement and stop of the electromagnet 7 A magnetic press forming rotary press device having a power source side contact 8 which reciprocates.