JP4181003B2 - Permanent magnet forming device - Google Patents

Description

  This invention forms a radially oriented permanent magnet molded product by sequentially conveying a plurality of dies filled with magnetic powder for molding magnetic material and applying magnetic field in the radial direction while pressing the magnetic powder. The present invention relates to a permanent magnet forming apparatus.

  A conventional ring-shaped permanent magnet forming apparatus, for example, forms a magnet material in a cavity of a mold including a die having a core and a lower punch inserted therein and an upper punch disposed to face the lower punch. The powder for forming the magnet material is filled, and a magnetic field is applied to the powder for molding the magnetic material by a pair of coils arranged around the mold, and the pressing is performed by the upper punch while performing orientation.

  In general, when magnetically forming a radial anisotropic ring magnet often used in small motors, when forming a ring-shaped magnet long in the axial direction, sufficient magnetic field strength cannot be obtained, and the orientation rate of the magnetic powder is low. There is a problem that the high magnetic characteristics cannot be obtained.

When the ring magnet is radially oriented, the magnetic flux that passes through the core of the mold that forms the magnetic powder in a ring shape is generally equal to the magnetic flux that passes through the inner diameter of the die, so the inner diameter of the ring magnet (the core diameter of the mold) ), Di is the outer diameter of the ring magnet (die inner diameter of the die) is Do, H is the height of the ring magnet (die height), Bc is the magnetic flux density that passes through the core of the die, and it passes through the inner diameter of the die. When the magnetic flux density to be performed is Bd, the relationship of the following formula (1) is established.
2 × π / 4 × Di ² × Bc = π × Do × H × Bd (1)

When a steel material such as S45C is used for the core of the mold, the saturation magnetic flux density of this steel material is about 1.5T. Therefore, in the above formula (1), Bc = 1.5 and the magnetic field necessary for the magnetic field orientation is 1.0T. If it is above, it will be Bd = 1.0T and the height H of the ring magnet which can carry out magnetic field orientation shaping | molding will become following formula (2).
H = 3Di ² / 4Do (2)

  When a ring magnet is magnetically molded, if the axial length of the ring magnet exceeds the value of H in the above formula (2), a decrease in orientation becomes a problem. Therefore, conventionally, a ring magnet having a short axial length equal to or less than the value of H in the above formula (2) is manufactured, and this is joined with an adhesive or the like to manufacture a ring magnet having a required axial length.

  In addition, a method has been proposed in which a magnet molded body having a short magnetic field forming range is stacked in a mold to form a magnet having a required axial length (see, for example, Patent Document 1).

  In addition, a method has been proposed in which a preform is formed by magnetic field shaping, and a plurality of preforms are pressed and integrated with a pressure greater than the pressure applied during the preforming (for example, Patent Document 2). reference).

JP-A-9-233776 (page 2-3, FIG. 1) JP-A-10-55914 (page 2-3)

  As described above, in the method of bonding a short axial length ring magnet with an adhesive or the like, the shape processing is performed after sintering the heat treatment of the short axial length ring magnet, and it is necessary to join them, so the productivity is poor, In addition, there is a problem that the shape accuracy after bonding is poor.

  In addition, in the method of forming a magnet having a required axial length by laminating short magnet molded bodies in a mold, there is a problem that the orientation in the vicinity of the lamination interface is easily disturbed and the magnetic characteristics are deteriorated.

  Further, in the method of forming a preform and integrating a plurality of preforms with a pressure larger than the pressure applied at the time of preforming, a larger molding facility for re-pressurization is required. At the same time, there is a problem that the preform is easily damaged during re-pressurization.

  In order to solve the above problems, the required number of ring-shaped permanent magnets with the required axial length is obtained by stacking (stacking) the required number of ring magnets with a short axial length, sintering and heat-treating the stacked compacts. However, in the conventional permanent magnet molding apparatus, when the molded body is molded, it is removed from the mold, and the operation of filling the empty cavity with the magnetic powder is repeated alternately. While filling with magnetic powder, the orientation and pressing operations must be interrupted. Therefore, productivity is reduced. In addition, since all the processes are performed in the magnetic field molding machine, there is a problem that there are many restrictions on each processing operation.

  The present invention has been made to solve the above-described problems, and provides a permanent magnet molding apparatus capable of manufacturing a ring magnet with a small deterioration in magnetic properties at a boundary portion between ring molded bodies with high productivity. It is intended to do.

The permanent magnet molding device according to the present invention includes a die, a core that is inserted into the die, and forms a ring-shaped space between the die and a lower portion of the space, and is supplied and filled with magnetic powder. A lower punch for forming a cavity, an upper punch for pressurizing the magnetic powder in the cavity, and a transfer mold capable of being transferred,
A powder supply and filling unit for supplying and filling the magnetic powder in the cavity;
By providing a ring-shaped elastic member that presses the surface of the die in the pressurizing direction, the difference in thickness of the transport mold in the press direction is absorbed, and the transport mold is fixed at a predetermined position. The magnetic powder pressed in the cavity is oriented in a radial direction perpendicular to the pressing direction while applying a magnetic field through a back yoke in contact with the die, and is radially oriented. A magnetic field forming unit for forming a molded body;
A demolding unit for extracting the molded body from the conveying mold;
A stacking unit that stacks a plurality of molded bodies extracted from the conveying mold in the axial direction;
The transfer molds are sequentially transferred to the supply / fill unit, the magnetic field forming unit, the demolding unit, and the stacking unit, and the units are arranged so that the processes in the units can be performed. .

  According to the structure of the said invention, the ring-type magnet with small magnetic characteristic degradation of the boundary part between ring molded objects can be manufactured with high productivity.

Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a perspective view showing an example of a ring magnet obtained by molding and sintering with the permanent magnet molding apparatus of the present invention, and FIG. 2 shows the configuration of the permanent magnet molding apparatus in Embodiment 1 of the present invention. FIG. 3 is a plan view, and FIG. 3 shows a configuration of the conveyance mold in FIG.

  As shown in FIG. 1, a ring magnet 1 formed and manufactured by the permanent magnet forming apparatus of the present invention is formed by laminating and sintering a ring formed body 1a formed into a cylindrical shape as shown in FIG. 1 (a). Or a ring molded body 1a having irregularities on the circumferential surface as shown in FIG. 1B (including those having irregularities on the outer circumferential surface but having irregularities on the inner circumferential surface) This is the result.

  In this way, the ring magnet 1 obtained by laminating and sintering the short-shaft ring molded body 1a is reduced in the magnetic characteristics at the boundary between the ring molded bodies 1a, so that the ring magnet has a large total magnetic flux. Can do.

  As shown in FIG. 2, the permanent magnet molding apparatus in this embodiment measures and supplies magnetic powder into the belt conveyor 2 that transports the transport mold 10 and the ring-shaped cavity of the transport mold 10. Powder supply / filling unit 3 for filling, punch set unit 4 for setting the upper punch for pressurizing the magnetic powder in the cavity in the conveying mold 10 filled with magnetic powder, in a state where pressure molding is possible, and upper punch Is set, and a magnetic field molding unit 5 that performs magnetic field pressure molding with the conveyance mold 10 ready for pressure molding, and a demolding unit for extracting the magnetic field pressure molded ring molded body from the conveyance mold 10 6, a molded body pulverizing unit 7 for removing excess magnetic powder adhering to the extracted ring molded body, and a stack for stacking the magnetic field pressure molded ring molded bodies Knit 8, to remove the magnetic powder adhering to the conveying die 10, and a mold removal flour / die set unit 9 to be set in the transport state the conveying molds 10.

  As shown in FIG. 3, the conveyance mold 10 includes a pallet 10a that moves on the belt conveyor 2, holders (first holders) 10b and 10c that hold the lower mold part, a columnar core 10d, The lower punch 10e and the core 10d are arranged in the center. Together with the lower punch 10e and the core 10d, the die 10f forming the cavity 10h to which the magnetic powder is supplied, and another holder (second holder) 10j are held. 10g of upper punches. The holder 10b is a ferromagnetic member, and the holder 10c is a non-magnetic member.

  The positions and directions of the pallet 10a and the holders 10b and 10j, the holder 10b and the lower punch 10e, and the lower punch 10e and the die 10f are regulated by positioning mechanisms using positioning pins, respectively.

  By providing the positioning mechanism in this manner, the mold parts are set on the pallet (the upper punch 10g is inserted into the core 10d and the die 10f), or the transfer mold 10 is positioned when the magnetic field forming unit 5 is transferred. The process of performing can be easily performed.

Hereinafter, the configuration and operation of the permanent magnet forming apparatus according to this embodiment will be described with reference to FIG.
FIG. 4 is a cross-sectional view illustrating the configuration and operation of the powder supply / filling unit. FIG. 4A shows a magnetic powder weighing process, and FIGS. 4B and 4C show a powder feeding process to the conveyance mold 10.

  As shown in FIG. 2, the powder feeding / filling unit includes a weighing mechanism 3d for weighing the magnetic powder, a conveyance mechanism 3e for weighing and collecting the magnetic powder 11 in the container 3c, and conveying the magnetic powder 11 to the position of the conveyance mold 10. It has. 4, the powder supply / filling unit 3 includes a rotation mechanism 3f for rotating and tilting the container 3c, and a powder supply jig 3a for guiding the magnetic powder 11 in the container 3c into the cavity 10h. And a vibration mechanism 3b including a vibrator for vibrating the powder feeding jig 3a.

  When the transport mold 10 is transported to the powder supply / filling unit, in the magnetic powder measurement step of FIG. 4A, the magnetic powder 11 having a constant weight is measured into the container 3c using a vibration feeder and a weight meter. Store.

  4 (b) and 4 (c), the powdered jig 3a on the funnel that guides the magnetic powder 11 to the cavity 10h of the conveying mold 10 and the magnetic powder 11 fed to the cavity are stirred. After a tool (not shown) is set on the die 10f of the conveying jig 10, the container 3c containing the magnetic powder 11 is moved to the position of the funnel-shaped powder feeding jig 3a, and the container 3c is rotated and tilted. Then, the magnetic powder 11 in the container 3c is transferred to the funnel-shaped powder feeding jig 3a. Further, an impact is applied to the container 3c with a knocker, and the magnetic powder 11 in the container 3c is transferred to the funnel-shaped powder feeding jig 3a without any residue. Further, vibration is applied to the funnel-shaped powder feeding jig 3a by the vibration mechanism 3b to move all the magnetic powder 11 on the powder feeding jig 3a into the cavity 10h, and the wings of the blade-shaped jig are rotated to rotate the cavity. While stirring the magnetic powder 11 within 10 h, the wings are raised to fill the cavity with the magnetic powder 11.

  By rotating the wing of the wing jig and stirring the magnetic powder 11 in the cavity, the wing is raised and the magnetic powder 11 is filled into the cavity, whereby the cavity in the magnetic powder in the cavity or the magnetic powder 11 is filled. Are broken, and the magnetic powder 11 is uniformly filled in the cavity.

  FIG. 5 is a cross-sectional view illustrating the configuration and operation of the punch set unit. As shown in the figure, the punch set unit includes a hand 4a that catches the upper punch 10g and a moving mechanism that moves the hand 4a up and down and moves the caught upper punch 10g.

  With the punch set unit, the mold can be set in a state where the magnetic powder in the cavity can be pressurized with the upper punch 10 g.

  When the cavity is filled with magnetic powder, the pallet 10a is transported to the stage of the punch set unit 4 and positioned at a specified position as shown in FIG. 5A, and the hand 4a is moved as shown in FIG. 5B. Lowering and catching the upper punch 10g, the hand 4a lifts the upper punch 10g as shown in FIG. 5 (c), moves toward the lower die as shown in FIG. The punch 10g is inserted into the core 10d, the upper punch 10g is released, and the upper punch 10g fits into the cavity. Since the diameter of the upper end of the core 10d is 0.02 mm smaller than the diameter in the cavity and a taper of 3 ° is provided, there is a deviation of less than 0.1 mm between the pallet and the hand 4a when the punch is inserted. However, the defect that the punch 10g cannot be inserted into the core 10d does not occur. Next, after releasing the upper punch 10g, the hand 4a rises and moves to the original position.

  6 is a cross-sectional view illustrating the configuration and operation of the magnetic field forming unit, FIG. 7 is a cross-sectional view illustrating the structure of the pressurizer, and FIG. 8 is a plan view (a), (c), and FIG. It is AA sectional drawing (b), (d). As shown in FIG. 2, the transfer mold 10 with the upper punch 10g set thereon is transferred from the two pallets 10 on the belt conveyor to the magnetic field forming unit 5, and is returned to the pallet 10a on the belt conveyor 2 after the magnetic field forming. It has a loading mechanism 5h. As shown in FIG. 6, the magnetic field forming unit 5 pressurizes the electromagnetic coil 5a (fixed to the frame) that generates an orientation magnetic field for orienting the magnetic powder, the upper electromagnetic coil 5a, and the upper punch 10g. A compression molding mechanism 5b for raising and lowering the pressurizer 5c and a back yoke 5d that is driven by an air cylinder (not shown) and contacts the die 10f are provided.

  As shown in FIG. 7, the pressurizer 5c includes a punch pressurizing unit 5e that pressurizes the upper punch, a movable rod 5f that is movable so as to be recessed into the punch pressurizing unit 5e, a back surface of the movable rod 5f, and a punch press. A spring 5g is provided between the inner surface of the pressure portion 5e and presses the movable rod 5f against the core 10d.

  Further, as shown in FIG. 8, the back yoke 5d is a single ferromagnetic body having a semicircular recess that fits the outer diameter of the die 10f. The back yoke 5d is set and installed so that the center of the thickness thereof coincides with the center position of the thickness of the die 10f, and moves and contacts the die 10f.

  When the upper punch is set and the pallet 10a is conveyed by the belt conveyor 2 from the punch set unit 4, as shown in FIG. 6A, the mold part is moved to the pallet by the transfer mechanism 5h (see FIG. 2). 10a is transferred to the forming part of the magnetic field forming unit 5.

  Next, as shown in FIG. 6B, the compression molding mechanism 5b operates, the electromagnetic coil 5a and the pressurizer descend, the upper and lower frames are fixed by the chucking function, and the upper frame The die 10f is fixed by a ring-shaped elastic member 5j attached to the lower part of the die 10f. Thereafter, the back yoke 5d moves from both sides of the die 10f, and comes into close contact with the outer periphery of the die 10f. Next, a current is caused to flow through the electromagnetic coil 5a to generate a radial orientation magnetic field, and the pressurizer 5c is lowered to pressurize the upper punch 5g. As shown in FIG. A radially oriented molded body can be obtained by compression molding the magnetic powder inside. The compression molding pressure is 10 to 100 MPa, preferably 40 MPa, and the orientation magnetic field is 1 T or more.

  FIG. 9 is a cross-sectional view showing a state of magnetic flux in the radial orientation. The magnetic field generated by the upper coil 5a becomes a magnetic flux, passes through the pressurizer 5c, which is a ferromagnetic material, enters the movable rod 5f, which is also a ferromagnetic material, and the magnetic field generated by the lower coil 5a is strong. It enters the core 10d through the holder 10b, which is a magnetic body (see FIG. 6). The lower punch 10e and the upper punch 10g are nonmagnetic materials.

  As shown in FIG. 9, the magnetic flux indicated by the broken line arrow passes through the movable rod 5f, which is a ferromagnetic material, and the core 10d, passes through the cavity 10h of the die 10f, which is a ferromagnetic material, in the diameter direction, and enters the cavity 10h. A radial alignment magnetic field is formed.

  The radially oriented molded body is returned to the pallet 10a together with the transfer mold by the transfer mechanism 5h.

  FIG. 10 is a plan view (a) and a cross-sectional view AA (b) showing the configuration of the demolding unit. As shown in the figure, the demolding unit includes a molded body pressurizing mechanism including an air cylinder 6a for pressing the molded body 13 and an upper punch abutting portion 6d, a table 6c for pushing the die 10f upward, and an air And a die push-up mechanism including a cylinder 6b and the like.

  FIG. 11 is a cross-sectional view for explaining the operation of the demolding unit. As shown in FIG. 11A, the pallet 10a on which the mold part including the radially oriented molded body is placed is conveyed to the demolding unit 6 by the belt conveyor 2 and stops at a predetermined position. The molded body 13 is pressurized by the molded body pressurizing mechanism in which the air cylinder 6a lifts the pallet 10a and the upper punch 10g hits the upper punch abutting portion 6d. The applied pressure is 0.1 to 1 MPa.

  Next, as shown in FIG. 11B, the air cylinder 6b operates, the table 6c lifts the die 10f, and the molded body 13 is extracted from the die 10f.

  Next, as shown in FIG. 11 (c), the air cylinder 6 a is lowered and the pallet 10 a is placed on the belt conveyor 2. The belt conveyor 2 moves the pallet 10a to a position where it is placed on another holder 10j placed on the pallet 10a when the die 10f supported by the table 6c is lowered, as shown in FIG. 11 (d). As described above, the table pressurizing cylinder 6b is operated, the table 6c is lowered, and the die 10f is placed on the holder 10j.

  In the process of extracting the molded body 13 from the conveying mold 10, if there is an internal stress difference between the upper part of the molded body 13 extracted from the conveying mold 10 and the lower part of the molded body 13 in the conveying mold 10. Although cracking is likely to occur, in this demolding unit, the molded body 13 is extracted from the die 10f in a state where the molded body 13 is pressurized, so that the internal stress difference between the upper and lower portions of the molded body 13 is reduced. The generation of cracks is prevented.

  FIG.12 and FIG.13 is sectional drawing explaining the structure and operation | movement of a molded object powdering unit. As shown in the figure, the compact de-dusting unit includes a table 7a and an elevating mechanism including an air cylinder 7b for elevating and lowering the table 7a, a nozzle 7c for injecting nitrogen gas, and sucking magnetic powder and collecting it in a dust collector. A dust suction duct 7d.

  By removing excess magnetic powder adhering to the molded body 13 by the molded body de-dusting unit, it is possible to prevent the molded body 13 from being inclined or displaced in the stacking of the next step.

  As shown in FIG. 12 (a), the molded body 13 from which the die has been removed is transferred to the molded body powdering unit by the belt conveyor 2 and stopped at a specified position, and the air cylinder 7b is activated to raise the table 7a. Then, as shown in FIG. 12B, the lower core 10e is supported by the table 7a and ascends, and the molded body 13 is extracted from the core 10d. At this time, the molded product 13 is extracted while the magnetic powder adhering to the outer periphery of the core 10 d is scraped off, so that the magnetic powder 11 adheres to the inner peripheral end surface portion of the molded product 13. At this time, the upper punch 10g is also extracted and placed on another holder 10j (see FIG. 3).

  As shown in FIG. 13A, in the process of extracting the molded body 13 from the core 10d, when the upper surface of the molded body 13 slightly protrudes from the core 10d, nitrogen gas is ejected from the nozzle 7c to the surface of the molded body 13. The adhering magnetic powder is blown off and sucked by the suction duct 7d. Thereafter, the molded body 13 is extracted from the core 10d as shown in FIG.

  14, FIG. 15 and FIG. 16 are cross-sectional views for explaining the configuration and operation of the stacking unit. As shown in the figure, the stacking unit includes a hand 8a as a mechanism for chucking the molded bodies 13, a table 8b for stacking the molded bodies 13, and a hand 8a that is positioned and lifted up and down. And a mechanism for moving, and a mechanism such as a motor for rotating the table 8b.

  As shown in FIG. 14A, the hand 8a is moved immediately above the molded body 13 extracted from the core 10d, and the hand 8a is lowered as shown in FIG. Is chucked with the hand 8a. The chucking force is 0.1 to 4N.

  Next, the hand 8a is raised, and the hand 8a is moved so that the center thereof is directly above the rotation center of the table 8b as shown in FIG. 15 (a), as shown in FIG. 15 (b). Then, the hand 8a is lowered to place the molded body 13 on the table 8b. At this time, the center of the molded body 13 coincides with the rotation center of the table 8b.

  Further, similarly, as shown in FIGS. 16A and 16B, the second and third-stage molded bodies 13 are laminated on the first-stage molded body 13, and this lamination step is performed. Repeatedly, the molded body 13 is laminated by the required number of steps.

  When the height of the molded body 13 varies, unnecessary pressure is applied to the molded body 13 during stacking (when the height is high), the molded body 13 is crushed, or the hand 8a moves the molded body in the air. In this embodiment, the weight of the molded body 13 molded at one time is determined by the magnetic powder measuring step of the powder feeding / filling unit 3 shown in FIG. Since a certain amount is measured, the height of the molded body 13 is constant, and no unnecessary force or impact force is applied to the molded body 13 during stacking.

  FIG. 17 is a diagram showing a process of laminating the molded body 13 at each stage in a state rotated by an arbitrary angle. For example, as shown in FIG. As shown in FIG. 17B, the A position is rotated by rotating the table 8b to invert the A position by 180 °, and the second-stage molded body 13 is stacked. Further, as shown in FIG. 17 (c), the table 8b is rotated by 45 ° to stack the third-stage molded body 13, and as shown in FIG. 17 (d), the 180 ° table 8b is further rotated. The fourth molded body 13 is stacked by rotating.

  In this way, by stacking the molded bodies 13 of each step in a state rotated by an arbitrary angle, for example, as shown in FIG. 1B, the convex portions of the ring molded body 1a having an uneven shape are formed. A ring magnet rotated at a skew angle in each stage can be obtained.

  FIG. 18 is a cross-sectional view showing a state where the axial end faces of the molded body are vertically inverted and stacked. For example, the magnetic characteristics of the molded body 13 may have a gradient on the upper punch side and the lower punch side, and a steep change in magnetic characteristics may occur at the joints at each stage. In the first stage, the axial end face of the molded body is inverted and the lower surface is the upper punch side, and in the second stage, the lower surface is the lower punch side and the lower layer is not inverted. It is possible to prevent a steep change in magnetic characteristics at the junction.

  Thus, in order to invert and stack the compacts, a rotary actuator is provided in the chuck portion of the hand 8a shown in FIGS.

  When the stacking process is completed, the transfer molds 10b, 10d, and 10e are returned onto the pallet by the transfer mechanism 12 and transferred to a mold de-dusting / mold setting unit that performs the next process.

  The mold de-dusting / mold setting unit is a powder removal mechanism that removes the magnetic powder adhering to the transfer mold 10 and the powder supply / filling unit can supply the magnetic powder and set each part of the transfer mold in the initial state. And a set mechanism.

  The dust removal mechanism includes a nozzle (having a mechanism for moving each part) that can inject nitrogen gas onto each part of the transport mold, and a suction mechanism for sucking and collecting the magnetic powder blown off by the nitrogen gas. And have.

  By the powder removal mechanism and the set mechanism, the steps up to the molding and stacking of the next cycle can be performed smoothly.

  The set mechanism is a mechanism that lifts the die 10f placed on the holder 10j shown in FIG. 3 and moves it onto the lower punch 10e placed on the holder 10b after the stacking process is completed. Since the die 10f is tapered on the inner diameter portion of the lower end face thereof, it can be easily inserted into the lower punch 10e. The height of the taper portion is smaller than the height of the convex portion in the radial direction of the lower punch 10e.

  The formed bodies on which the formed bodies 13 are stacked are transferred to a sintering / heat treatment furnace, sintered and heat-treated at a predetermined temperature, and then subjected to a finishing process as necessary. The ring magnet 1 shown in FIG. Get.

  According to the ring-type magnet manufacturing apparatus in this embodiment, a process of manufacturing a short molded body by using a plurality of conveying molds 10 at the same time in each unit provided in each place of the belt conveyor 2 using the belt conveyor 2. Since the required number of molded bodies are stacked (laminated), a tact time is shortened, and a ring-type magnet with little deterioration in magnetic properties at the boundary between the ring molded bodies can be manufactured with high productivity. .

  The present invention is used, for example, for manufacturing a permanent magnet used for a rotary electric motor such as a motor.

It is a perspective view which shows the example of the ring magnet obtained by shape | molding with the permanent magnet shaping | molding apparatus of this invention, and sintering. It is a top view which shows the structure of the permanent magnet shaping | molding apparatus in Embodiment 1 of this invention. The structure of the conveyance metal mold | die in FIG. 2 is shown, (a) is a top view, (b) is AA sectional drawing. It is sectional drawing explaining a powder supply and filling unit and its operation | movement. It is sectional drawing explaining the structure and operation | movement of a punch set unit. It is sectional drawing explaining the structure and operation | movement of a magnetic field shaping | molding unit. It is sectional drawing which shows the structure of a pressurizer. It is a top view (a) which shows composition of a back core, (c), and AA sectional view (b) and (d). It is sectional drawing which shows the state of the magnetic flux in radial orientation. It is the top view (a) which shows the structure of a mold removal unit, and AA sectional drawing (b). It is sectional drawing for demonstrating the operation | movement in a mold removal unit. It is sectional drawing explaining the structure and operation | movement of a molded object powdering unit. It is sectional drawing explaining the structure and operation | movement of a molded object powdering unit. It is sectional drawing for demonstrating the structure and operation | movement of a stacking unit. It is sectional drawing for demonstrating the structure and operation | movement of a stacking unit. It is sectional drawing for demonstrating the structure and operation | movement of a stacking unit. It is a figure which shows the process of laminating | stacking the molded object 13 of each step | paragraph in the state rotated only by arbitrary angles. It is sectional drawing which shows the state which turned up and down the axial direction end surface of the molded object, and was stacked.

Explanation of symbols

1 ring magnet, 1a ring molded body, 2 belt conveyor,
3 powder supply / filling unit, 3a powder supply jig, 3b vibration mechanism, 3c container,
3d weighing mechanism, 3e transport mechanism, 3f rotation mechanism, 4 punch set unit,
4a, 8a hand, 5 magnetic field forming unit, 5a electromagnetic coil, 5b compression molding mechanism,
5c Pressurizer, 5d Back yoke, 5e Punch pressurizing part, 5f Movable rod,
5g Spring, 5h, 12 Transfer device, 5j Ring-shaped elastic member, 6 Demolding unit,
6a, 7b Air cylinder, 6b Table pressurizing cylinder,
6c, 7a, 8b Table, 6d Upper punch abutting section, 7 Molded body powdering unit,
7b Air cylinder, 7c Nozzle, 7d Dust collection duct, 8 stack unit,
9 Mold de-dusting / Mold set unit, 10 Transport mold, 10 Pallet,
10, 10c, 10j holder, 10d core, 10e lower punch, 10f die,
10g upper punch, 10h cavity, 11 magnetic powder, 13 compacts.

Claims (10)

A die, a core inserted into the die and forming a ring-shaped space between the die, a lower punch that closes a lower portion of the space and forms a cavity in which magnetic powder is supplied and filled; While having an upper punch for pressurizing the magnetic powder in the cavity, a transport mold capable of transport,
A powder supply and filling unit for supplying and filling the magnetic powder in the cavity;
By providing a ring-shaped elastic member that presses the surface of the die in the pressurizing direction, the difference in thickness of the transport mold in the press direction is absorbed, and the transport mold is fixed at a predetermined position. The magnetic powder pressed in the cavity is oriented in a radial direction perpendicular to the pressing direction while applying a magnetic field through a back yoke in contact with the die, and is radially oriented. A magnetic field forming unit for forming a molded body;
A demolding unit for extracting the molded body from the conveying mold;
A stacking unit that stacks a plurality of molded bodies extracted from the conveying mold in the axial direction;
The conveyance mold is sequentially conveyed to the supply / filling unit, the magnetic field forming unit, the demolding unit, and the stacking unit, and the units are arranged so that the processes in the units can be performed. A permanent magnet forming apparatus. The conveyance mold includes a pallet, and a first holder and a second holder placed on the pallet, and the lower punch and the core are configured to be placed on the first holder. The die is configured to be placed on the lower punch and the second holder, the pallet, the first holder and the second holder, the first holder, the lower punch, and the lower holder. 2. A permanent magnet forming apparatus according to claim 1, further comprising a positioning mechanism for determining a position and a direction of the punch and the die, and the second holder and the upper punch. 2. The permanent magnet forming apparatus according to claim 1, further comprising an upper punch set unit for inserting the upper punch into the core and fitting the cavity into the cavity. 2. The permanent magnet molding apparatus according to claim 1, wherein the core has a tapered shape with a tip diameter 0.02 to 1 mm smaller than a diameter in the cavity. The demolding unit includes a molded body pressurizing mechanism that pressurizes the molded body by pushing up the lower punch, core, die, upper punch, and molded body, and a die push-up mechanism that pushes up the die. The permanent magnet forming apparatus according to claim 1. 2. The permanent magnet molding apparatus according to claim 1, further comprising a molded body de-pulverizing unit that removes the magnetic powder adhering to the molded body in the middle of the process in the demolding unit. 2. The permanent magnet molding apparatus according to claim 1, further comprising a mold de-dusting unit for removing magnetic powder adhering to the conveying mold after the molded body is extracted. 2. The permanent magnet molding apparatus according to claim 1, further comprising a mold set unit for rearranging the die, core, lower punch, and upper punch in the transfer mold after the molded body is extracted. . 2. The permanent magnet molding according to claim 1, wherein the back yoke configured to move the transfer mold to a predetermined position has a function of moving in a radial direction to a side surface where the die abuts. apparatus. 2. The permanent magnet molding apparatus according to claim 1 , wherein the stacking unit includes a table for stacking the molded bodies extracted from the conveyance mold by rotating a predetermined angle .

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