JPH1110397A - Compacting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the working rate of a device and to simplify the structure of the device in compacting in the case of manufacturing a permanent magnet, etc. SOLUTION: By providing a vertical through-hole shape guide part 5 to a rotary table 3, a die 9 is freely ascendably and descendably held to this guide part 5. In an opening part on the upper part side of this die 9, a rubber die 10 is housed and held and in an opening part on the lower part side, a punch member 11 is held so that it can not be dropped. When the rotary table 3 stops at a press position Y, the punch member 11 is pushed upward by a piston device 18 and the whole die 9 is pressed to an upward pressure receiving member 20. On the pressure receiving member 20, a rubber lid 22 is provided and by this, an isotropic press is performed to a powder raw material 12 charged in the rubber die 10. A press load is not transmitted to the rotary table 3 and structural simplification is contrived. The ascending and the descending operation strokes of the piston device 18 can be made small and it is related to the enhancement of the working rate of the device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing various powder compacts such as permanent magnets, which can achieve high operation efficiency and low production cost, and has a simple structure. The present invention also relates to a powder molding apparatus that can be designed.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 7-44121 discloses a rotary type apparatus for manufacturing a permanent magnet. In this device, a plurality of dies are integrally formed at a predetermined interval near an outer peripheral portion of a rotary table that can be intermittently rotated, and each time the rotary table is partially rotated, each die is The rubber mold filled with the raw material powder is circulated in order to the loading position (or the raw material powder filling position in the rubber mold set in the die), the pressing position, and the take-out position of the rubber mold (or pressed compact). Has become.

[0003] A rubber lid is inserted into a rubber mold at an appropriate position before pressing, and a magnetic field orientation treatment is applied to the raw material powder. The lid is removed.

[0004]

In the above-mentioned conventional apparatus, the die is formed integrally with the rotary table, so that the rotary table itself and its rotary support structure are sufficient to withstand the pressing load. Strength was required. For this reason, the whole apparatus has been increased in size and complicated in structure.

In addition, since the rubber lid is inserted into and removed from the rubber mold, and the magnetic field orientation treatment is performed separately at positions other than the pressing position, a sufficient time margin is provided for the rotation interval of the rotary table. It is necessary to increase the number of stoppages, and the operation efficiency of the apparatus is accordingly poor, and therefore, the production efficiency of permanent magnets and the like is reduced, and the production cost is increased.

The present invention has been made in view of the above circumstances, and as an apparatus for manufacturing various powder compacts including permanent magnets, it is possible to increase the operating efficiency and reduce the manufacturing cost. It is another object of the present invention to provide a powder compacting apparatus capable of simplifying the structure.

[0007]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, the powder molding apparatus according to the present invention has a moving body provided so as to be movable between a plurality of processing positions including a pressing position. This moving body includes not only a rotary table but also a cassette body or the like to be conveyed.

The movable body is provided with a guide portion formed as, for example, a vertical hole, and the die can be held up and down with respect to the guide portion. That is, the die is separate from the moving object. In addition, a rubber mold having a molding concave portion opened at a position flush with the upper surface level is stored and held in this die.

The die is provided with a punch member capable of supporting the lower surface of the rubber mold and protruding below the moving body. On the other hand, at the press position, a piston device that allows the entire die to move up and down via a punch member is provided. Further, a pressure receiving member is provided at the press position for holding the die when the die is raised by the piston device.

[0010] With such a configuration, when the die is positioned at the pressing position by the moving body, the piston device operates to raise the punch member and the die, and press the rubber mold against the pressure receiving member, thereby forming the molding recess. Pressing pressure is applied isotropically to the raw material powder filled therein, but at this time, the pressing load by the piston device is not applied to the moving body. Therefore, the moving body does not need to have enough strength to withstand the press load, and the structure can be simplified and reduced in size.

In order to ensure that the punch member returns to its original position in the die when the piston device is returned to the state before it was raised, the punch member is urged downward by a spring or the like. It is good to keep. If a rubber lid is provided for the pressure receiving member that can contact at least the upper surface of the raw material powder filled in the rubber mold concave part when the die is pressed against the die, the rubber lid can be attached to and detached from the rubber mold at the same time as pressing. And it will be performed automatically. Therefore, the position where the rubber lid is inserted and removed from the rubber mold can be omitted as the stop position of the moving body, and the operating efficiency can be increased accordingly.

When a permanent magnet or the like is manufactured, at least the peripheral wall portion of the die that holds the rubber mold is formed of a non-magnetic material. Then, a magnetic field generating device is provided in a stroke where the die is raised by the piston device with respect to the press position. In this way, the magnetic powder can be subjected to the magnetic field orientation treatment on the raw material powder in the rubber mold during the process of raising the die and the punch member by the piston device during the pressing. Note that the magnetic field orientation treatment includes particle orientation immediately before pressing and demagnetization immediately before pressure release.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of a powder molding apparatus 1 according to the present invention. This powder molding apparatus 1 has a moving body 3 configured as a rotary table that rotates intermittently around a support shaft 2.

The movable body 3 is provided with a guide portion 5 formed in a vertically penetrating shape at three equally spaced positions along the outer peripheral surface 3a of the table. Around the moving body 3, a powder filling position X, a pressing position Y, and a molded body taking out position Z are set in accordance with the arrangement pitch of each guide portion 5.
Are provided, and each time the movable body 3 rotates intermittently, each guide section 5 is simultaneously moved forward between the respective positions.

The moving body 3 is rotatably held on the support shaft 2 via a bearing 6, and is appropriately transmitted to a housing portion 7 holding the bearing 6 or an outer peripheral surface 3 a of the table. Rotational driving force is transmitted via an unillustrated). Note that the support shaft 2 and the moving body 3 may be fixed to each other without providing the bearing member 6, and the rotation driving force may be transmitted to the support shaft 2 itself.

All the guides 5 of the moving body 3 include:
In each case, a cylindrical die 9 penetrating vertically is held so as to be able to move up and down. A table mounting portion 9a is provided on the outer periphery of the upper portion of each die 9, and has a structure capable of positioning with respect to the guide portion 5 and raising the die 9 (not shown). In the die 9, a rubber mold 10 can be stored and held in an upper opening, and a punch member 11 is inserted and held in a lower opening. The lower end of the punch member 11 protrudes below the moving body 3.

The rubber mold 10 has an internal shape corresponding to the press-formed body to be obtained, and can be filled with the raw material powder 12 in an amount that allows the press-formed body to shrink by sintering or the like. A molding recess 13 is formed. The recess 13 is open at the same level as the upper surface of the die 9. The punch member 11 has a punch body 11a that can slide up and down inside the die 9, and a spring receiving portion 11b that projects radially outward from a lower peripheral portion thereof. A coil spring 14 is fitted around the punch body 11a, and both ends of the coil spring 14 can contact the upper surface of the spring receiving portion 11b and the lower surface of the die 9.

Accordingly, when the punch member 11 is raised at least with respect to the die 9, a compressive force is stored in the coil spring 14, whereby an urging force is generated in the punch member 11 so as to move downward from the die. . Although not shown, the punch member 11 is prevented from falling off the die 9. As a structure that can be adopted for this purpose, for example, a vertically long hole is formed in the peripheral wall of the die 9, and a retaining pin that penetrates this hole is pushed up to the outer peripheral surface of the punch member 11. In addition,
The punch member 11 is formed as a stepped shaft having a tapered lower side, and a spring receiving portion 11b for receiving a spring is made detachable. The lower opening of the die 9 can be engaged with a step provided on the punch member 11. A structure in which a flange is provided can also be adopted.

At the upper end of the punch member 11, a backup plate 15 made of an elastic material harder than the rubber mold 10 is arranged, and the backup plate 15 is fixed by a backup holder 16 or the like. Therefore, when the punch member 11 rises and the rubber mold 10 is vertically compressed and deformed, a part of the rubber mold 10 is pressed into a circumferential gap between the inner peripheral surface of the die 9 and the outer peripheral surface of the upper end portion of the punch member 11. This is prevented by the backup plate 15.

When the punch member 11 is lowered, the rubber plate 10 is smoothly and reliably released from the vertical compression deformation and returns to the original state.
The bottom of 0 is fixed. Instead of this fixing method, die 9
A rubber press ring (not shown) may be attached to the upper surface of the. For the moving body 3, the die 9, and the punch member 11, a piston device 18 is provided below the moving body 3 at the press position Y, and a pressure receiving member 20 is provided above the moving body 3 at the press position Y. Is provided.

The piston device 18 has a hydraulic or mechanical actuator (not shown) so that the piston 18a can be moved up and down. Therefore, when the piston device 18 raises the piston portion 18a while the punch member 11 is positioned directly above the piston device 18 (that is, the press position Y), the die is 9 will be raised along the guide part 5 of the moving body 3. Of course, by lowering the piston portion 18a, the entire die 9 can be lowered to the original position.

In this piston device 18, when the piston portion 18a is lowered, the upper surface level is such that when the die 9 with respect to the moving body 3 and the punch member 11 with respect to the die 9 are both in the lowered state, It is set to be slightly lower than the lower end level. Therefore,
The intermittent rotation of the moving body 3 also causes the punch member 1
1 and the piston portion 18a do not interfere with each other, and the punch member 11 can be raised by a slight rise of the piston portion 18a. That is, by setting such a positional relationship, the up / down operation stroke of the piston device 18 is made as small as possible, thereby shortening the time required for pressing.

The pressure receiving member 20 serves to stop the rise of the die 9 when the die 9 is raised by the piston device 18 as described above.
The upper surface of the rubber mold 10 and the upper surface of the raw material powder 12 filled in the molding recess 13 are brought into contact with each other by a rubber lid 22 provided therebetween. Therefore, when the pressure of the die 9 is stopped by the pressure receiving member 20, the rubber mold 10
Pressing force isotropically applied to the raw material powder 12 by the rubber mold 10 and the rubber lid 22, and a press-formed body having a required shape is formed in the forming recess 13.

At the time of pressing, the punch member 1
1 is raised against the spring force of the coil spring 14, a biasing force acting downward of the die 9 acts on the punch member 11, and the piston device 18 lowers the piston portion 18a after pressing. At times, the biasing force of the coil spring 14 surely returns the punch member 11 to the original lowered position.

The lower surface level of the pressure receiving member 20 (rubber cover 2)
2 is set to a level slightly higher than the upper surface level of the die 9 when the die 9 is in a lowered state with respect to the moving body 3. Therefore, even when the moving body 3 rotates intermittently, the die 9 and the pressure receiving member 20 do not interfere with each other, and the press operation can be started by a slight rise of the piston portion 18a in the piston device 18. That is, by setting such a positional relationship, the up / down operation stroke of the piston device 18 is made as small as possible, thereby shortening the time required for pressing.

On the other hand, at the powder filling position X, the rubber mold 10 held by each die 9 is
A predetermined amount of the raw material powder 12 can be fed into the inside. As a device for this, for example, a conventionally known hopper device, a powder feeder, or the like can be used. At this time, at the same time, a vibration generator (not shown) or the like is
If the micro vibration is transmitted to the rubber mold 10 by making contact with the rubber mold 10, the packing density distribution can be advantageously made uniform.

Further, at the molded body removal position Z, the pressed molded body can be removed from the molding recess 13 of the rubber mold 10 held by each die 9. As an apparatus for this, for example, a vacuum or magnet type suction head 25 is reciprocated between an upper part of the moving body 3 and an upper part of the carry-in part of the carry-out conveyor by an arm robot 26 or the like, and is moved up and down. Things are used.

In the powder molding apparatus 1 having such a configuration, the moving body 3 intermittently rotates by a predetermined angle (120 °) while the powder filling position X, the pressing position Y, and the molding body taking-out are stopped. At each of the positions Z, a predetermined operation is performed at the same time. At the press position Y, the loading and removal of the rubber lid 22 with respect to the rubber mold 10 can be omitted, and the time required for pressing can be shortened due to the shortening of the vertical movement stroke of the piston device 18. This means that the operating efficiency of the entire press operation has been dramatically improved as compared with the conventional case.

At the press position Y, no pressing load acts on the moving body 3, so that the moving body 3 itself and its rotating support structure can be structurally simplified and miniaturized. There are also advantages. FIG. 3 shows a second embodiment of the powder molding apparatus 1 according to the present invention. The second embodiment is most different from the first embodiment in that a raw material powder 12 to be filled in a rubber mold 10 is used. In that magnetic powder is used, and a magnetic field orientation treatment is applied to the raw material powder 12 immediately before pressing.

Therefore, the difference in configuration is that the pressing position Y
In the above, the pressure receiving member 20 is provided above the die 9 with a predetermined height space secured, and the magnetic field generator 30 is provided in this height space, and the die 9 is
And a structure having a cylindrical shell 32 fitted to the outer peripheral portion of the peripheral wall portion 31.

The guide 5 provided on the moving body 3
Is formed by a short cylindrical housing member so that the cylindrical shell 32 can be stably held. Other configurations, operations, and effects are substantially the same as those of the first embodiment. The magnetic field generator 30 has an air-core coil form that can surround the stroke of the die 9 and the rubber mold 10 that are raised and lowered by the piston device 18.

In other words, when the piston device 18 is moving up the die 9 and the punch member 11 or when the die 9 is stopped by the pressure receiving member 20 (during pressing), the magnetic field generator 30 removes the raw material powder 12 in the rubber mold 10. Is subjected to a magnetic field orientation process in a predetermined direction. Also, before the piston device 18 starts lowering the die 9 and the punch member 11 after pressing, the magnetic field generator 30 generates a weak magnetic field so as to perform demagnetization processing on the magnetized press molded body. I do. This demagnetization treatment is performed to facilitate removal of the press-formed body and subsequent handling.

In the die 9, the peripheral wall portion 31 is formed of a non-magnetic material, so that no magnetic harm occurs between the raw material powder 12 or the press-formed body after the magnetic field orientation treatment and the magnetization by the magnetic field generator 30. Like that. The magnetic field generator 30 may have a structure that descends from above in order to shorten the stroke of the piston device 18.

The present invention is not limited to the above embodiment. For example, incorporating the magnetic field generator 30 at the press position Y is not limited. Therefore, a magnetic field orientation processing position, a demagnetization processing position, or the like may be provided at a position different from the press position Y, and the magnetic field generator 30 may be incorporated at these positions.

In this case, the approach and separation of the die 9 and the rubber mold 10 to and from the magnetic field generating device 30 are performed in the same manner as the piston device 18 at the press position Y by a fluid pressure cylinder or the like provided below the moving body 3. A method may be adopted in which the die 9 and the punch member 11 are pushed up by the lifting / lowering driving tool.
The magnetic field generating device 30 may be moved up and down without providing the lifting drive.

The number of guides 5 provided for the moving body 3,
That is, the number of dies 9 that can be held is not limited at all. The moving body 3 is a conveyor 3 as shown in FIG.
It is also possible to form a cassette body which is fed straight by 5.

[0037]

As apparent from the above description, in the powder molding apparatus according to the present invention, the die, the rubber mold and the punch member are
In the press position, these are pressed against the pressure receiving member by the piston device without interfering with the moving body, so that the moving body itself and its rotating support structure are structured. Simplification and miniaturization are possible.

Moreover, with this structure, it is possible to shorten the up-and-down operation stroke of the piston device, and it is possible to shorten the time required for pressing, so that high operation efficiency and low manufacturing cost can be achieved. This also leads to downsizing of the capacity of the piston device, and further downsizing of the device becomes possible.

If the punch member is urged downward with respect to the die, the punch member can be reliably returned to the original position when the piston device is raised and then lowered. Smoothness and reliability can be achieved. If a rubber lid is provided for the pressure receiving member, the rubber lid can be attached to and detached from the rubber mold simultaneously and automatically with the press, so that the stop position of the moving body can be set smaller, and the operating efficiency of the entire apparatus can be reduced accordingly. Can be enhanced.

When a permanent magnet or the like is manufactured, a magnetic field generator is provided between the press position and a step in which the die is raised by the piston device, so that the magnetic field orientation treatment is simultaneously performed during the pressing operation. Therefore, the number of stop positions of the moving body can be set smaller, and the operating efficiency of the entire apparatus can be improved accordingly.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view taken along line AA of FIG.

FIG. 2 is a plan view showing a first embodiment of the powder molding apparatus according to the present invention.

FIG. 3 is a sectional view showing a second embodiment of the powder molding apparatus according to the present invention from the same viewpoint as FIG.

FIG. 4 is a schematic side view showing a pressing position of a third embodiment of the powder molding apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Powder molding apparatus 3 Moving body 5 Guide part 9 Die 10 Rubber mold 11 Punch member 12 Raw material powder 13 Molding concave part 18 Piston device 20 Pressure receiving member 22 Rubber lid 31 Peripheral wall part 30 Magnetic field generator Y Press position

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yasuo Manabe 2-3-1, Shinhama, Arai-machi, Takasago-shi, Hyogo Kobe Steel, Ltd. Takasago Works

Claims (4)

[Claims] 1. A movable body (3) movably provided between a plurality of processing positions including a press position (Y) and a guide portion (5) provided on the movable body (3) so as to be vertically movable. And a rubber mold (10) provided with a molding recess (13) housed and held in the die (9) and opened at the same level as the upper surface of the die (9). The die (9) has a punch member (1) that can support the lower surface of the rubber mold (10) and protrudes below the moving body (3).
A piston device (1) is provided at the press position (Y) so that the entire die (9) can be moved up and down via a punch member (11).
8) and the piston device (18)
A pressure receiving member (20) capable of abutting against the die (9) raised by the pressure molding device. 2. A punch member (11) for said die (9).
The powder molding apparatus according to claim 1, wherein the powder is urged downward from the die. 3. A die (9) is provided on the pressure receiving member (20).
A rubber lid (22) is provided, which can be in contact with at least the upper surface of the raw material powder (12) filled in the molding recess (13) of the rubber mold (10) when the abutment is stopped. The powder molding apparatus according to claim 1 or 2. 4. A die (9) wherein at least a peripheral wall portion (31) for holding a rubber mold (10) is formed of a non-magnetic material, and a die (9) is formed by a piston device (18) at a press position (Y). The powder molding apparatus according to any one of claims 1 to 3, wherein a magnetic field generator (30) is provided in a process in which the pressure increases.