JP2012056273A - Magnetic field extrusion molding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic field extrusion molding apparatus which can smoothly extrude an extrusion material, and can produce a molded body having satisfactory magnetic field orientation.SOLUTION: An extrusion material 2E is extruded by a prescribed amount from an extrusion port 2c to mold an almost planar molded body 8. The molded body 8 is conveyed to a first magnetic field orientation part 4, a second molding part 5, a temporal drying part 6 and a second magnetic field orientation part 7 in order by a conveying part 3. A magnetic field is applied to the molded body 8 in the first magnetic field orientation part 4. The molded body 8 is molded in an almost semi-cylindrical shape in the second molding part 5. The molded body 8 is dried to a degree at which its flexibility is not damaged in the temporal drying part 6. A magnetic field stronger than the magnetic field generated in the first magnetic field orientation part 4 is applied to the molded body 8 in the second magnetic field orientation part 7.

Description

  The present invention relates to a magnetic field extrusion molding apparatus, and more particularly to a magnetic field extrusion molding apparatus that performs magnetic field orientation after extruding a molded body.

  2. Description of the Related Art Conventionally, a magnetic field extrusion molding apparatus has been proposed in which a magnetic body is oriented while extruding an extruded material composed of a magnet powder material, a solvent, and the like to form a molded body. For example, a magnetic field extrusion molding apparatus in which the vicinity of an extrusion port of an extrusion die is configured by a magnetic yoke has been proposed (see Patent Document 1).

  And in the magnetic field extrusion molding apparatus of patent document 1, when extrusion material is extruded from the magnetic yoke which forms an extrusion port, the magnetic field of a desired direction is applied to extrusion material, and a molded object is shape | molded. ing.

JP 2002-83726 A

  However, since the conventional magnetic field extrusion molding device is configured to apply a magnetic field at the extrusion port, even when trying to push out while applying a strong magnetic field, the extruded material may not be pushed well due to the influence of the magnetic field, and the extruded material may become clogged. . Furthermore, the molded body may be deformed immediately after extrusion due to the influence of leakage magnetic force generated from the magnetic yoke forming the extrusion port.

  Then, an object of this invention is to provide the magnetic field extrusion molding apparatus which can manufacture the molded object which can extrude extrusion material smoothly and has a favorable magnetic field orientation.

  In order to achieve the above object, the present invention includes an extrusion mold having an extrusion port and a supply means for supplying an extrusion material having at least a magnet material and a solvent to the extrusion mold, and presses the extrusion material. An extrusion molding machine for forming a molded body by extrusion from an outlet, a first magnetic field orientation means for applying a magnetic field to the molded body, provided at a distance from the extrusion molding machine, and magnetic field orientation by the first magnetic field orientation means. Temporary drying means for temporarily drying the molded body, second magnetic field orientation means for applying a magnetic field to the temporarily dried molded body, first magnetic field orientation means, temporary drying means, and second A magnetic field extruding apparatus having a magnetic field strength of the second magnetic field orientation unit is stronger than that of the first magnetic field orientation unit.

  According to such a configuration, since the magnetic field is not applied to the extruded material in the process in which the extruded material is extruded from the extrusion mold, the extruded material can be smoothly extruded without being clogged, and the molded product is affected by the leakage magnetic force. It is possible to prevent deformation. Further, in the first magnetic field orientation means, the orientation of the particles of the magnet powder material constituting the molded body is aligned, and after the molded body is temporarily dried in the temporary drying means to improve the strength, in the second magnetic field orientation means Since a magnetic field stronger than the magnetic field generated in the first magnetic field orientation unit is applied to the molded body, a molded body having a good magnetic field orientation can be manufactured.

  Here, the extrusion molding machine intermittently performs the extrusion operation, the conveying means conveys the molded body according to the intermittent extrusion operation, and the first magnetic field orientation means and the second magnetic field orientation means are the moldings. It is preferable that a magnetic field is applied to the molded body while the body is stationary, and the molded body is released from the application of the magnetic field by the first magnetic field orientation means and the second magnetic field orientation means during conveyance.

  According to such a configuration, it is possible to realize a good magnetic orientation with respect to the compact without disturbing the magnetic orientation as compared with the case where a magnetic field is applied to the compact in the transported state.

  Further, the apparatus further comprises secondary forming means for forming a molded body magnetically oriented by the first magnetic field orientation means, and the temporary drying means pre-drys the molded body molded by the secondary shaping means to provide a second magnetic field. The orientation means preferably applies a magnetic field along the shape after molding of the molded body molded by the secondary molding means.

  According to such a configuration, even if the magnetic field orientation of the molded body is disturbed by the secondary molding, the molded body having a good magnetic field orientation can be manufactured by correcting with the second magnetic field orientation means.

  According to the magnetic field extrusion molding apparatus of the present invention, the extruded material can be smoothly extruded, and a molded body having a good magnetic field orientation can be produced.

1 is a schematic view of a magnetic field extrusion molding apparatus in an embodiment of the present invention.

  An embodiment of the magnetic field extrusion molding apparatus of the present invention will be described with reference to FIG. As shown in FIG. 1, the magnetic field extrusion molding apparatus 1 includes an extrusion molding unit 2, a transport unit 3, a first magnetic field orientation unit 4, a secondary formation unit 5, a temporary drying unit 6, and a second magnetic field orientation unit 7. ing.

  The extrusion molding unit 2 includes an extrusion mold 2A and a material supply unit 2B. The extrusion die 2A is formed with an extrusion port 2c, and the extrusion die 2A is provided with an extrusion punch 2D. The extrusion port 2c has a substantially rectangular shape. The material supply unit 2B is configured to be able to supply the extruded material 2E into the extrusion mold 2A. The extruded material 2E is composed of a mixture of a magnet powder material (eg, ferrite, rare earth metal), a solvent (eg, water), a binder, and a plasticizer. The extrusion material 2E in the extrusion die 2A is configured to be intermittently extruded from the extrusion port 2c by the extrusion punch 2D. That is, when a predetermined amount of the extruded material 2E is extruded from the extrusion mold 2A, the extrusion punch 2D is stopped. The molded body 8 extruded from the extrusion mold 2A has a substantially flat plate shape and is flexible. The extrusion molding unit 2 shown in the present embodiment is a plunger-type extruder, but may be a screw-type extruder, and even with such a configuration, a similar molded body 8 can be molded. The effect of the invention can be realized.

  The transport unit 3 includes a plurality of suction pads 3A, and is a suction hand that transports the molded body 8 by sucking the molded body 8 by the suction pads 3A. The extrusion molding unit 2, the first magnetic field orientation unit 4, and the secondary formation The molded body 8 is configured to be transportable between each of the part 5, the temporary drying part 6, and the second magnetic field orientation part 7.

  The 1st magnetic field orientation part 4 is arrange | positioned in the position spaced apart from the extrusion molding part 2, and is provided with 4 A of 1st magnetic field generation parts, and the 2nd magnetic field generation part 4B. The first and second magnetic field generators 4A and 4B are arranged so as to face each other in the vertical direction. Further, the first magnetic field generation unit 4A is configured to be close to and away from the second magnetic field generation unit 4B along the vertical direction by a moving mechanism (not shown). The first and second magnetic field generators 4A, 4B are each provided with a coil (not shown), and generate a magnetic field in the direction indicated by the arrow 4C by passing a current through the coil.

  The secondary molding unit 5 includes a first molding die 5A and a second molding die 5B. The first molding die 5A and the second molding die 5B each have a substantially rectangular shape in sectional view, and are arranged so as to face each other in the vertical direction. The first molding die 5A is configured to be close to and away from the second molding die 5B along the vertical direction by a moving mechanism (not shown). The first molding die 5A has a lower surface 5C that faces the second molding die 5B, and a concave portion 5d that is substantially semicircular in sectional view is formed on the lower surface 5C. The second molding die 5B has an upper surface 5E that faces the first molding die 5A, and the upper surface 5E is provided with a convex portion 5F that is substantially semicircular in sectional view. The first molding die 5A comes close to the second molding die 5B, and the lower surface 5C and the upper surface 5E come into contact with each other, so that the first molding die 5A is substantially between the first molding die 5A and the second molding die 5B. A semi-cylindrical space (cavity) is defined.

  The temporary drying unit 6 includes a first hot air generating unit 6A and a second hot air generating unit 6B, which are arranged so as to face each other via the molded body 8 in the vertical direction, and warm air is directed toward each other. 6C and 6D are generated.

  The second magnetic field orientation unit 7 includes a third magnetic field generation unit 7A and a fourth magnetic field generation unit 7B. The third and fourth magnetic field generators 7A and 7B are arranged so as to face each other in the vertical direction. The third magnetic field generation unit 7A is configured to be close to and away from the fourth magnetic field generation unit 7B along the vertical direction by a moving mechanism (not shown). The third magnetic field generator 7A has substantially the same shape as the first molding die 5A. Therefore, a concave portion 7d having a substantially semicircular shape in cross section is formed on the lower surface 7C of the third magnetic field generating portion 7A. The 4th magnetic field generation part 7B is provided with the convex part 7E of cross-sectional view substantially semicircle shape. Each of the third and fourth magnetic field generators 7A and 7B includes a coil, and when a current flows through the coils, the fourth magnetic field generator 7B moves from the fourth magnetic field generator 7B to the third magnetic field generator 7A as indicated by an arrow 7F. To generate a magnetic field radially. The second magnetic field orientation unit 7 is configured to generate a magnetic field stronger than the magnetic field generated by the first magnetic field orientation unit 4.

  Next, a method for forming the molded body 8 and magnetizing the molded body 8 will be described. First, in the extrusion die 2A filled with the extrusion material 2E, the extrusion punch 2D is moved by a predetermined stroke, and the extrusion material 2E is extruded from the extrusion port 2c by a predetermined amount. Thereby, the substantially flat molded body 8 is molded. Further, the extrusion punch 2D is stopped when a predetermined amount of the extruded material 2E is extruded from the extrusion port 2c.

  Next, the transport unit 3 transports the compact 8 to the first magnetic field orientation unit 4 in a state where the compact 8 is adsorbed by the suction pad 3A, and the compact 8 is placed on the second magnetic field generator 4B. The At the time when the molded body 8 is placed on the second magnetic field generator 4B, the currents to the coils (not shown) of the first and second magnetic field generators 4A and 4B are OFF. Then, the first magnetic field generator 4A descends so as to be close to the molded body 8, and the molded body 8 is sandwiched between the first magnetic field generator 4A and the second magnetic field generator 4B. In this state, a current is passed through coils (not shown) of the first and second magnetic field generators 4A and 4B, a magnetic field is generated in the direction indicated by the arrow 4C, and a magnetic field is applied to the molded body 8. Thereby, the orientation of the particles of the magnet powder material constituting the compact 8 is aligned with the direction of the magnetic field. Note that the strength of the magnetic field is set to a strength that does not deform the molded body 8 sufficiently containing the solvent. Then, the current to the coils (not shown) of the first and second magnetic field generators 4A and 4B is turned off, and the first magnetic field generator 4A is raised and separated from the molded body 8.

  Next, the molded body 8 after the magnetic field orientation by the first magnetic field orientation unit 4 is transported from the first magnetic field orientation unit 4 to the secondary molding unit 5 by the transport unit 3. In the secondary molding part 5, the molded body 8 is placed on the convex part 5F of the second molding die 5B. Then, the first molding die 5A descends toward the second molding die 5B, and the lower surface 5C of the first molding die 5A and the upper surface 5E of the second molding die 5B are deformed while deforming the molded body 8. Abut. In this contact state, a substantially semi-cylindrical space is defined by the concave portion 5d and the convex portion 5F between the first molding die 5A and the second molding die 5B as described above. Therefore, the molded body 8 is molded into a substantially semi-cylindrical shape along the defined space, and an inner peripheral surface 8A and an outer peripheral surface 8B are formed. Then, the first molding die 5A is raised and separated from the molded body 8.

  Next, the molded body 8 after the secondary molding by the secondary molding unit 5 is transported from the secondary molding unit 5 to the temporary drying unit 6 by the transport unit 3. In the temporary drying unit 6, the molded body 8 is disposed between the first hot air generating unit 6A and the second hot air generating unit 6B. Then, the warm air 6C and 6D are generated from the first warm air generator 6A and the second warm air generator 6B, and are dried (temporarily dried) to the extent that the flexibility of the molded body 8 is not impaired. Thereby, compared with before drying (temporary drying), the intensity | strength of the molded object 8 after drying (temporary drying) improves relatively.

  Next, the compact 8 after temporary drying by the temporary drying unit 6 is transported from the temporary drying unit 6 to the second magnetic field orientation unit 7 by the transport unit 3. In the 2nd magnetic field orientation part 7, the molded object 8 is mounted so that the internal peripheral surface 8A may contact | abut on the convex part 7E of the 4th magnetic field generation part 7B. At the time when the molded body 8 is placed on the fourth magnetic field generator 7B, the currents to the coils (not shown) of the third and fourth magnetic field generators 7A and 7B are OFF. Then, the third magnetic field generator 7A descends so as to be close to the molded body 8, and the surface of the third magnetic field generator 7A that forms the recess 7d and the outer peripheral surface 8B of the molded body 8 come into contact with each other. The compact 8 is sandwiched between the magnetic field generator 7A and the fourth magnetic field generator 7B.

  In this state, a current is passed through coils (not shown) of the third and fourth magnetic field generators 7A and 7B to generate a magnetic field stronger than the magnetic field generated by the first magnetic field orientation unit 4 in the direction indicated by the arrow 7F. Since the magnetic field is generated radially from the fourth magnetic field generator 7B toward the third magnetic field generator 7A, the magnetic field is applied along the shape of the substantially semi-cylindrical shaped body 8. Thereby, the orientation of the particles of the magnet powder material is aligned radially from the inner peripheral surface 8A to the outer peripheral surface 8B of the compact 8. Then, the current to the coils (not shown) of the third and fourth magnetic field generators 7A and 7B is turned off, and the third magnetic field generator 7A is raised and separated from the molded body 8. Next, the compact 8 after the magnetic field orientation by the second magnetic field orientation unit 7 is accommodated in a pallet or the like by the transport unit 3.

  As described above, in the process in which the extruded material 2E is extruded from the extrusion mold 2A, no magnetic field is applied to the extruded material 2E, so that the extruded material 2E can be smoothly extruded without clogging, and the influence of leakage magnetic force It can prevent that the molded object 8 deform | transforms. Further, the first magnetic field orientation unit 4 aligns the orientation of the particles of the magnet powder material constituting the compact 8, and the temporary drying unit 6 provisionally drys the compact 8 to improve the strength, and then the second magnetic field orientation. Since the magnetic field stronger than the magnetic field generated in the first magnetic field orientation unit 4 is applied to the molded body 8 in the part 7, the molded body 8 having a good magnetic field orientation can be manufactured.

  In addition, as described above, the first and second magnetic field orientation units 4 and 7 apply a magnetic field to the molded body 8 in a state where the molded body 8 is stationary, and when the molded body 8 is transported by the transport unit 3, the molding is performed. The body 8 is released from the application of the magnetic field by the first and second magnetic field orientation units 4 and 7. Therefore, compared with the case where a magnetic field is applied with respect to the molded object in a conveyance state, favorable magnetic orientation can be implement | achieved with respect to the molded object 8, without disturbing magnetic orientation.

  In addition, since the molded body 8 is secondarily molded by the secondary molding section 5 and then temporarily dried by the temporary drying section 6 and magnetically oriented by the second magnetic field orientation section 7, the magnetic field orientation of the molded body 8 is increased by the secondary molding. Even if it is disturbed, it can be corrected by the second magnetic field orientation unit 7 and the molded body 8 having a good magnetic field orientation can be produced.

  The magnetic field extrusion molding apparatus of the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, a demagnetizing means may be provided between the first magnetic field orientation unit 4 and the second magnetic field orientation unit 7 or behind the second magnetic field orientation unit 7. Moreover, although the conveyance part 3 was the adsorption | suction hand which adsorb | sucks and conveys the molded object 8 with the adsorption pad 3A, the extrusion molding part 2, the 1st magnetic field orientation part 4, the secondary formation part 5, the temporary drying part 6, As long as the molded body 8 can be conveyed between each of the second magnetic field orientation portions 7, a belt conveyor may be used.

DESCRIPTION OF SYMBOLS 1 Magnetic field extrusion molding apparatus 2 Extrusion molding part 2A Extrusion die 2B Material supply part 2c Extrusion port 3 Conveying part 3A Suction pad 4 1st magnetic field orientation part 4A 1st magnetic field generation part 4B 2nd magnetic field generation part 5 Secondary formation part 6 Temporary drying unit 7 Second magnetic field orientation unit 7A Third magnetic field generation unit 7B Fourth magnetic field generation unit 8 Molded body

Claims (3)

Extrusion molding having an extrusion die having an extrusion port and supply means for supplying an extrusion material having at least a magnet material and a solvent to the extrusion die, and extruding the extrusion material from the extrusion port to form a molded body Machine,
A first magnetic field orientation unit that is provided apart from the extruder and applies a magnetic field to the molded body;
Temporary drying means for temporarily drying the molded body magnetically oriented by the first magnetic field orientation means;
Second magnetic field orientation means for applying a magnetic field to the temporarily dried shaped body;
A transporting means for transporting the molded body in the order of the first magnetic field orientation means, the temporary drying means, and the second magnetic field orientation means,
A magnetic field extrusion molding apparatus characterized in that the magnetic field strength of the second magnetic field orientation means is stronger than the magnetic field strength of the first magnetic field orientation means. The extrusion molding machine performs an extrusion operation intermittently, and the conveying means conveys the molded body according to the intermittent extrusion operation,
The first magnetic field orientation means and the second magnetic field orientation means apply a magnetic field to the molded body in a state where the molded body is stationary, and the molded body is transported to the first magnetic field orientation during transportation. 2. The magnetic field extrusion molding apparatus according to claim 1, wherein the magnetic field extrusion molding apparatus is free from the application of a magnetic field by the means and the second magnetic field orientation means. Further comprising secondary forming means for forming the molded body magnetically oriented by the first magnetic field orientation means,
The temporary drying means temporarily dry the molded body formed by the secondary forming means,
3. The magnetic field extrusion according to claim 1, wherein the second magnetic field orientation unit applies a magnetic field along a shape after molding of the molded body molded by the secondary molding unit. Molding equipment.

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