JPH10156890A - Mold for molding magnet roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate magnetic field intensity of a mold by simultaneously conducting shortening of a molding time and reducing of a manufacturing cost of a magnet roll. SOLUTION: In the mold for molding a magnet roll 1 comprising a main molding unit having a molding space 15 for molding a roll part of the roll 1, shaft molding units 30 for molding shafts of the roll at both ends of the main molding unit, and a nozzle 17 for supplying resin to charge a molten magnet material from an axial central direction to be opposed at its end in at least one of both the units 30, a reservoir 17B for setting a shaft end position of the roll 1 is formed by introducing the material charged by the nozzle 17 at an end face 17A of the nozzle 17, thereby constituting the mold for molding the roll 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet roll used for an electrophotographic developing device such as a copying machine, a facsimile, a printer, and the like, and a mold for molding a magnet roll used for other purposes.

[0002]

2. Description of the Related Art For example, a magnet roll using a permanent magnet material is used as a developing roll and a cleaning roll in an electrophotographic developing device such as a copying machine, a facsimile, and a printer. As magnet rolls used for these applications, those using sintered magnets such as alnico magnets and ferrite magnets have been known for a long time, but in recent years, from the viewpoint of ease of molding and arbitrary shape, A magnet roll using a magnet material in which a magnetic powder is blended with a binder such as a synthetic resin or a low melting point metal is becoming mainstream. Such a magnet roll can be formed by an injection molding method (for example, see Japanese Patent Publication No. 63-41203) or an extrusion molding method (for example, JP-A-55-1656).
No. 06 gazette).

As a magnet roll manufactured by an injection molding method, a magnet material-integrated magnet roll in which a roll portion 2 and shaft portions 3 and 4 are integrally formed of a magnet material like a magnet roll 1 shown in FIG. It is widely used.

[0004] As a molding die for molding the above-described magnet material-integrated magnet roll, there is one which has been previously proposed by the present applicant (Japanese Patent Application No. 8-155762). As shown in FIG. 2, the molding die is slidably mounted in the molding space 15 with a main molding portion 21 having a molding space 15 for molding the roll portion 2 of the magnet roll 1 with substantially no gap. A slide mold 27 serving as a shaft forming portion for forming one end of the magnet roll 1; and a shaft forming portion which is detachably attached to the other side of the main forming portion 21 and forms the other end of the magnet roll 1. 30 and fixed to the main molding portion 21 so as to surround the molding space 15;
Further, there is provided a magnetic field orienting means 26 for orienting the magnetic particles of the molten magnet material filled in the molding space 15 in one direction.

[0005]

The tip of the resin supply nozzle 17 for filling the magnet forming material 30 with the molten magnet material from the axial direction thereof is fixed to the shaft forming portion 30.
From the resin supply nozzle 17 to the shaft forming section 3
The magnet roll 1 is formed by filling the molten magnet material in the space 0. Then, the resin supply nozzle 17
Is formed flat as shown in FIG. By the way, when the molten magnet material is filled with the resin supply nozzle 17, a projection 16 (also referred to as “gate remaining”) projecting toward the inner surface of the inlet 31 at the tip of the resin supply nozzle 17 is formed. However, since the protrusion 16 protrudes from the tip end surface 17A of the resin supply nozzle 17 as described above, the protrusion 16 of the formed magnet roll 1 is scraped off, so that the resin supply nozzle 17 The dimensional error of the magnet roll 1 due to the projection 16 can be avoided by making it flush with the outer peripheral portion of the distal end face 17A. In other words, as shown in FIG. 22, the length of the formed magnet roll 1 in the longitudinal direction becomes longer by the interval h, so that the protrusion 16 must be cut off. The size (projection degree) of the protrusion 16 differs each time the magnet roll 1 is formed. Therefore, conventionally, the protrusion 16 is cut off to prevent a dimensional error of the magnet roll 1 from occurring. As described above, every time the magnet roll 1 is formed, an operation of shaving and removing the protrusion 16 of the magnet roll 1 is required, so that not only the molding time of the magnet roll 1 is long but also the manufacturing cost is reduced. It was expensive and there was room for improvement.

The magnetic field orienting means 26 comprises a permanent magnet 24 for excitation and a pole piece (often called a yoke) 25 as a magnetic path. Was fixed in contact. Therefore, when performing the magnetic field strength adjustment of the mold having such a configuration, as shown in FIG. 14, the mold is configured using permanent magnets 24 having different sizes (two in the figure). Alternatively, a mold having a different distance between the inner wall 21A of the main mold 21 and the pole piece 25 is newly manufactured.

The permanent magnets 24 of different sizes as described above
In any case where the distance between the inner wall 21A of the main molding die 21 and the pole piece 25 is different, a new mold must be manufactured, so that an increase in cost cannot be avoided. there were. Also,
When the distance between the inner wall 21A of the main molding die 21 and the pole piece 25 is increased as in the latter case, the peak of the magnetic field pattern of the magnet roll becomes unclear, and the peak angle value of the magnetic field of the magnet roll becomes the target peak angle. In some cases, the values deviated from the values, making it difficult to implement.

A case where the magnet roll 1 is formed by using the above-described molding die will be described. In a state where the slide mold 27 is mounted in the molding space 15, the molding space 1 is formed.
The magnet roll 1 is molded in the molding space 15 while injecting and injecting the molten magnet material into the magnet 5 and orienting the magnetic particles of the molten magnet material filled in the excitation unit 18 in one direction. Then, after the molten magnet material is solidified, the end mold 30 is removed from the main mold 21 and the slide mold 27 is advanced, whereby the molded magnet roll 1 is discharged out of the mold.

After the molten magnet material is solidified as described above,
By moving the slide die 27 forward to discharge the formed magnet roll 1 out of the mold, the sliding contact between the outer surface of the magnet roll 1 to be moved and the inner surface of the main forming die 21 and the slide die 27 moving forward are performed. The inner surface of the main molding die 21 is unnecessarily worn due to the sliding contact between the outer surface of the main molding die 21 and the inner surface of the main molding die 21, so that the main molding die 21 needs to be replaced periodically. However, since the main molding die 21 and the excitation unit 18 are manufactured as an integral body as described above, the main molding die 21 and the excitation unit 18 are formed.
Therefore, the entire mold having the above has to be replaced, which increases the cost. Further, for example, if the magnet roll 1 is formed using a pair of upper and lower split molds, it is not necessary to replace the split mold by sliding contact as described above, but "burrs" remain in the product. There was a problem.

SUMMARY OF THE INVENTION In view of the above situation, the present invention is to solve the problem that the molding time of the magnet roll can be reduced and the manufacturing cost can be reduced at the same time, and the magnetic field strength of the mold is adjusted. Is to be realized in a state in which the conventional inconvenience has been solved, and furthermore, the replacement of the main molding die due to the wear of the inner surface can be performed in a state in which the increase in cost is avoided.

[0011]

According to the present invention, in order to solve the above-mentioned problems, a main forming part having a forming space for forming a roll portion of a magnet roll is provided. A resin for shaping the shaft portion of the roll portion, and a resin for filling the molten magnet material into at least one of the shaft portion forming portions from the axial direction thereof. In the molding die for a magnet roll facing the tip of the supply nozzle, the molten magnet material filled into the tip surface of the resin supply nozzle is inserted to set the end position of the shaft of the magnet roll. The storage part was formed to form a mold for forming a magnet roll. Therefore, as the molten magnet material is charged into the shaping portion from the resin supply nozzle, the molten magnet material enters the storage portion formed on the tip end surface of the resin supply nozzle. In this state, the molten magnet material solidifies to form a magnet roll. The thus formed magnet roll protrudes from the tip surface of the resin supply nozzle by the depth of the storage part. By setting the depth of the storage portion such that the projecting portion projects more than the projecting portion formed at the end of the magnet roll corresponding to the central portion of the resin supply nozzle, as in the prior art, If the magnet roll is formed in consideration of the end face of the portion as the size of the magnet roll in the longitudinal direction, the work of scraping off the projection as in the conventional case becomes unnecessary.

A shaft forming portion, which is located on the side opposite to the side where the resin supply nozzle is disposed, is slidably mounted in the forming space with substantially no gap, and a slide for forming one end of a magnet roll. An end formed from a mold and having a shaft forming portion positioned on the side where the resin supply nozzle is disposed, detachably attached to the other side of the main forming portion, and forming the other end of the magnet roll. A magnetic field orienting means, which is constituted by a part forming die, is fixed to the main forming part so as to surround the forming space, and provides a unidirectional alignment of the magnetic particles of the molten magnet material filled in the forming space. And a mold for forming a magnet roll. While the slide mold is mounted in the molding space, the molten magnet material is injected and injected into the molding space from the end molding side,
Since the slide mold is forcibly or retracted to an appropriate molding position by the injection pressure according to the injection speed, and the magnetic particles of the molten magnet material are oriented in one direction by the magnetic field orientation means, the magnet roll is molded in the molding space. is there. And
After the molten magnet material is solidified, the end molding die is removed from the main molding part, and the slide die is advanced to discharge the molded magnet roll out of the die.

A main forming die having a forming space for forming a roll portion of a magnet roll is provided. The forming space is filled with a molten magnet material, and the filled magnetic particles of the molten magnet material are moved in one direction. A molding die for a magnet roll, wherein a magnetic field orienting means for orienting is provided on an outer peripheral edge of the main molding die so as to surround the molding space, wherein the magnetic field orienting means is disposed on an outer peripheral edge of the main molding die. And a permanent magnet for applying a magnetic field line to the main mold through the magnetic path,
The mold for forming a magnet roll was configured so that the position of the permanent magnet with respect to the magnetic path could be changed in the radial direction of the roll portion. Therefore, when performing the magnetic field strength adjustment, by changing the position of the permanent magnet in the radial direction of the roll portion, the strength of the line of magnetic force generated from the permanent magnet is changed in proportion to the square of the distance to the magnetic path. It is. At this time, since the distance from the inner wall of the main mold to the magnetic path is not changed and is constant, the magnetic flux generated from the permanent magnet can be guided by the magnetic path in the same manner as before the distance change. You can.

A main forming die having a forming space for forming a roll portion of a magnet roll is provided. The forming space is filled with a molten magnet material, and the filled magnetic particles of the molten magnet material are transferred in one direction. In a molding die for a magnet roll, wherein a magnetic field orienting means for orienting is provided on an outer peripheral edge of the main molding die so as to surround the molding space, the magnetic field orienting means is arranged on an outer peripheral edge of the main molding die. A magnetic path, and a permanent magnet for providing magnetic lines of force to the main mold through the magnetic path,
Modification means for changing the magnetic resistance is provided between the permanent magnet and the magnetic path to form a molding die for the magnet roll. Therefore, when adjusting the magnetic field strength, the amount of passage of the lines of magnetic force generated from the permanent magnet is controlled by changing the magnetic resistance between the permanent magnet and the magnetic path by the changing means. At this time, since the distance from the inner wall of the main mold to the magnetic path is not changed and is constant, the magnetic flux generated from the permanent magnet can be guided by the magnetic path in the same manner as before the distance change. You can. Since the position of the permanent magnet can always be fixed at a predetermined position, the magnetic field intensity can be adjusted in a wider range than in the method of changing the position of the permanent magnet as in the method of claim 1. At the same time, handling becomes easier as compared with the case where the fixing to the permanent magnet is performed every time the position of the permanent magnet is changed.

Specifically, a non-magnetic member as a changing means is inserted between the permanent magnet and the magnetic path to change the magnetic resistance between the permanent magnet and the magnetic path. .

A main molding die having a molding space for molding the roll portion of the magnet roll, and a slide mold which is slidably mounted in the molding space with substantially no gap and which forms one end of the magnet roll. And an end forming die which is detachably attached to the other side of the main forming die and forms the other end of the magnet roll, and the magnetic particles of the molten magnet material filled in the forming space are provided. In a molding die for a magnet roll, wherein a magnetic field orienting means for orienting in one direction is provided on an outer peripheral edge of the main molding die so as to surround the molding space, an exciting unit provided with the magnetic field orienting means; And a main mold is configured to be detachable from the exciting unit.
When the inner surface of the main mold is worn and it is time to replace the main mold, the main mold is removed from the exciting section and a new main mold is attached to the exciting section. In addition, "burr" does not occur unlike the split mold system.

The exciting section includes a plurality of magnetic paths arranged on an outer peripheral edge of the main mold, and a permanent magnet for flowing lines of magnetic force toward the magnetic paths. By configuring the magnet so that the angle can be changed with respect to the outer peripheral edge of the main molding die, only by changing the angle of the magnetic path and the permanent magnet with respect to the outer peripheral edge of the main molding die, the peak angle position of the magnetic field pattern can be determined. Changes can be made.

An end member of the main mold is provided with an engaging member which is engaged with the longitudinal end of the main mold in a longitudinal direction to prevent the main mold from coming off. It is possible to reliably prevent the mold from unexpectedly moving in its longitudinal direction.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a magnet roll 1 integrated with a magnet material. Shafts 3 and 4 having reduced diameters are formed at both ends of the magnet roll 1 and the cylindrical roll 2 so as to protrude therefrom, and a notch 5 for positioning or driving force transmission is formed on the shaft 3.
Are formed integrally using a magnet material. The present invention is also applicable to a magnet roll 1 in which the roll portion 2 is not a cylinder but a polygonal pillar, and a roll in which the center of the roll portion 2 and the center of the shaft portions 3 and 4 are intentionally decentered. The same can be applied.

The magnetic material constituting the magnet roll 1 is mainly composed of a magnetic powder and a binder for binding the magnetic powder, and a silane-based or titanate-based coupling agent for strengthening the bond. It is a mixture containing a small amount of a lubricant to improve the fluidity, a stabilizer to prevent the thermal decomposition of the binder, etc.It can also contain a flame retardant if necessary. (SmCo-based, NdFeB-based), Mn
AIC, arconic, SmFeN, and the like can be selected. As the binder, a thermoplastic resin, a thermosetting resin, a low melting point alloy, or the like can be used.

The magnet roll 1 having the above structure is used as a developing roll or a cleaning roll in an electrophotographic developing device such as a copying machine, a facsimile, a printer, etc. Can be.

Next, the molding die 10 for the magnet roll 1 will be described. As shown in FIGS. 2 and 3,
A movable mold 11 and a fixed mold 12 are provided. The movable mold 11 includes a cylindrical movable body (not shown), and a molding unit 14 is provided in the movable body. In a state where the molding space 15 in the molding unit is closed by combining the stationary mold 12 with the fixed mold 12, the molten magnet material is supplied from the injection cylinder (not shown) to the molding space 15 of the molding unit 14 via the resin supply nozzle 17. Thus, the magnet roll 1 is formed in the forming space 15. The resin supply nozzle 17 may use either a hot gate method in which the molten magnet material is heated by a heater or the like or a cold gate method in which the material is not heated.

A sleeve-shaped main forming part 21 for forming the roll part 2 is provided. Shaft part forming parts for forming the shaft parts 3 and 4 of the roll part 2 are provided at both ends of the main forming part 21. 27, 30 and one end of the resin supply nozzle 17 for filling the molten magnet material into one of the shaft forming portions 30 from the axial direction thereof. ing. The one shaft portion forming portion 30 is fixed to the fixing member 6, and the other shaft portion forming portion 27 is penetrated and supported by a support member 62 bolted to a retaining plate 28 described later. As shown in FIG.
A reservoir for allowing the molten magnet material filled by the resin supply nozzle 17 to enter the tip surface 17A of the resin supply nozzle 17 to set the end position of the shaft of the magnet roll 1, that is, a resin supply nozzle A circumferential groove 17B concentric with the nozzle 17 is formed. Therefore, when the molten magnet material is supplied to the molding space 15 by the resin supply nozzle 17,
The storage part 17B is also filled with the molten magnet material. By solidifying the molten magnet material in this state, FIG.
The magnet roll 1 in which the protruding portion 7 is formed on the outer periphery of the end shown in (a) and (b) is formed. As described above, when filling the molten magnet material, the resin supply nozzle 1
Even if the protrusion 16 is formed at the end of the magnet roll 1 corresponding to the center of the protrusion 7, the protrusion 7 protrudes from the protrusion 16 as shown in FIG. By setting the depth of the storage portion 17B, assuming that the end of the projecting portion 7 is the end of the magnet roll 1, and setting the length of the magnet roll 1 in the longitudinal direction, a projection like the conventional one can be obtained. The work of scraping the part 16 can be eliminated. In the drawing, the case where the projecting portion 7 protrudes from the projecting portion 16 by the interval H is shown, but the projecting portion 16 and the projecting portion 7 are flush or the projecting portion 7 projects beyond the projecting portion 16. The interval H is not limited to the size shown in the drawing. Since the size (projection degree) of the projection 16 differs each time the magnet roll 1 is formed, the depth of the storage portion 17B is adjusted to a case where the projection 16 is assumed to be most protruded. Will be set.

As another embodiment, as shown in FIG.
A mold for forming a magnet roll may be configured from two split molds 60 and 61 each having a forming portion so that the axis of the magnet roll 1 is located at the mating surface 66 of the mold. In this case, the shaft portion forming portions 27 and 30 are integrally formed with the two split molds 60 and 61. A resin supply nozzle 17 for supplying the molten magnet material is also formed at one end of the two split molds 60 and 61. The resin supply nozzle 17 referred to here is
A passage for guiding the resin supplied from a resin supply nozzle (not shown) is provided, and a portion to which the resin is supplied including this passage is referred to as a resin supply nozzle 17.
As shown in FIG. 20, the storage portion 17B is also formed on one end of the two split molds 60 and 61, that is, on the side where the resin supply nozzle 17 is formed. One of the split molds 60 and 61 is configured such that the other split mold is movable with respect to one of the split molds. When the split mold is moved closer and closed, the molten magnet material is injected and injected, and after the molten magnet material is solidified, the movable split mold is moved away from the fixed split mold. It is opened and the formed magnet roll 1 is taken out. As described above, the depth of the storage portion 17B formed at the end of the shaft portion forming portion 30 is set according to the case where the projection 16 is assumed to be in the most protruding state. The storage unit 1
7B is formed in the groove, but by projecting the inner periphery of the tip of the nozzle 17, a step is formed between the inner periphery and the outer periphery of the tip of the nozzle 17 so that the molten magnet material enters the step. Alternatively, the shape of the storage section 17B is not limited to these.

A shaft type molding portion 27 located on the side opposite to the resin supply nozzle 17 side is slidably mounted in the molding space 15 with almost no gap, and a slide type for molding one end of the magnet roll 1. It consists of. The left end of the slide die 27 extends to the left through a retaining plate 28 fixed to the left side of the movable die 11, and is connected to an actuator 29 as shown in FIGS. .
Then, the slide mold 2 is moved by the actuator 29.
7 is driven over a forward position shown in FIG. 4 and a retracted position shown in FIG. In addition, as the actuator 29, a hydraulic cylinder, a pneumatic cylinder, a screw screw, a rack and pinion gear, a linear motor, or the like can be used, and the specific configuration of the actuator 29 is not limited to these.

As shown in FIG. 2 and FIG. 16, the main molding die 21 is movably fitted in an exciting portion 18 described later, and one end of the main molding die 21 is connected to the movable die 11.
An engaging member 64 which is in contact with a support member 62 bolted to the retaining plate 28 fixed to the left side of the retaining member 28 and is retained and supported, and the other end of which is screwed to the end plate 63 of the exciting section 18. Is locked and held. Therefore, when the inner surface 21A of the main mold 21 is worn and the main mold 21 is to be replaced, the engaging member 64 is detached from the end plate 63 to thereby allow the distal engaging portion 64A of the engaging member 64 to be removed.
21M as an engaged portion formed in the main mold 21
, And the main mold 21 is removed from the exciting unit 18. Then, the new main molding die 21 is placed in the exciting section 1.
After the fitting, the replacement of the main mold 21 is completed by screwing the engaging member 64 to the end plate 63.

Referring to the molding unit 14, as shown in FIGS. 2 and 3, a substantially cylindrical back yoke 20 made of a soft magnetic material is provided on the outermost peripheral edge. Is provided with the main molding portion 21. A plurality of spacer blocks 22 made of a non-magnetic material are provided inside the back yoke 20, and the main molded portion 21 is inserted through the spacer blocks 22.
Are fixedly held at the center of the back yoke 20.
Four cooling water passages 2 are provided in the spacer block 22.
3 is formed, and the molten magnet material filled in the molding space 15 is cooled by the cooling water flowing through the cooling water passage 23. Cooling water is supplied to the cooling water passage 23 from one of the cooling water inlets and outlets 8 shown in FIG. 2 and then discharged through the other cooling water inlet and outlet 8. Reference numeral 30A shown in the figure is a cooling water hole formed in the shaft forming section 30. Further, between the back yoke 20 and the main molded portion 21, four sets of a permanent magnet 24 and a distal yoke 25 and a proximal yoke 9 made of a soft magnetic material are provided radially at a predetermined angle, Permanent magnet 24 arranged with main molded portion 21 interposed
Are set to the same polarity. The back yoke 20, the permanent magnet 24, the tip yoke 25, and the base yoke 9
The magnetic field orienting means 26 for orienting the magnetic particles of the molten magnet material in one direction is constituted by this and the magnetic field orienting means 26 is referred to as the exciting section 18. The tip yoke 25 includes a permanent magnet 24
It is configured to function as a magnetic path for narrowing the lines of magnetic force from the target in a desired direction.

As shown in FIG. 3, of the four tip yokes 25, two tip yokes 25 facing each other with the main molding die 21 interposed therebetween, and the corresponding permanent magnet 24 A non-magnetic material spacer 19 is provided between the permanent magnets 24 and the magnetic resistance between the permanent magnet 24 and the tip yoke 25 is changed to control the amount of passage of the lines of magnetic force generated from the permanent magnets 24 to adjust the magnetic field strength. Like that. The magnitude of the magnetic resistance with respect to the permanent magnet 24 can be changed by replacing the main mold 21 with a non-magnetic material spacer 19 having a different radial dimension. In this case, it is necessary to change the size of the tip yoke 25 according to the size of the non-magnetic material spacer 19. or,
Instead of the non-magnetic spacer 19, the air layer is replaced with the tip yoke 2
The magnetic resistance between the permanent magnet 24 and the tip yoke 25 may be changed by forming the space between the permanent magnet 5 and the permanent magnet 24 and changing the size of the space of the air layer.

As shown in FIG. 15, the spacer blocks 22 and the tip yoke 2 disposed therebetween are provided.
5, a little play between the permanent magnet 24 and the base yoke 9
5 may be formed and implemented. In this case, by moving the distal yoke 25, the permanent magnet 24, and the proximal yoke 9 within the play 65, the angle with respect to the outer peripheral edge of the main mold 21 can be changed, and the peak angle position of the magnetic field pattern can be changed. So that you can do it. Specifically, for example, as shown in FIG.
5, the width of the two sets of the distal yoke 25, the permanent magnet 24, and the base yoke 9 of the permanent magnet 24 and the base yoke 9 is changed to the width of the other two sets of the distal yoke 25, the permanent magnet 24, and the base yoke 9. A smaller play 65 may be formed between the distal yoke 25, the permanent magnet 24, and the proximal yoke 9 by using a smaller one. 24, by changing the size of the spacer block 22 without changing the size of the base yoke 9, a little play 65 is formed between the tip yoke 25, the permanent magnet 24, and the base yoke 9. The specific configuration is not limited to these. The tip yoke 25, the permanent magnet 24,
The play 65 prevents the proximal yoke 9 from moving easily.
May be provided by providing a non-magnetic member (spacer) or the like for filling the gap.

As described above, by providing the non-magnetic material spacer 19 between the distal end yoke 25 and the corresponding permanent magnet 24, the permanent magnet 24 and the distal end can be connected without changing the position of the permanent magnet 24. The magnetic resistance between the yoke 25 and the yoke 25 is changed. However, as shown in FIG. 12, the position of the permanent magnet 24 itself is changed so that the intensity of the magnetic force lines emitted from the permanent magnet 24 is made proportional to the square of the distance. It may be changed. That is, as shown in the figure, the size of a specific tip yoke 25 is changed (the tip yoke 25 is enlarged in the figure), and the tip yokes 2 having different sizes are used.
By changing the size of the base yoke 9 in accordance with 5 (the base yoke 9 is made smaller in the figure), the position of the permanent magnet 24 can be changed and adjusted in the radial direction of the main mold 21. I have. As shown in FIG. 13, the non-magnetic material spacer 19 may be provided between the permanent magnet 24 and the tip yoke 25 as described above without changing the size of the tip yoke 25. . In this case, a small one is used for the base yoke 9 according to the size of the non-magnetic material spacer 19. The specific configuration for changing the position of the permanent magnet 24, such as forming an air layer between the permanent magnet 24 and the tip yoke 25, is not limited thereto. When an air layer is formed between the permanent magnet 24 and the distal yoke 25, a small one is used for the proximal yoke 9 in accordance with the size of the nonmagnetic spacer 19 as described above. In FIG. 13, the non-magnetic material spacer 19
In addition, since the position of the permanent magnet 24 can be changed by inserting the angle, there is an advantage that the intensity of the magnetic field lines can be changed and adjusted over a wider range. As the magnetic field orienting means 26, a plurality of sets other than the four sets of the permanent magnet 24, the distal yoke 25, and the proximal yoke 9 are provided.
Various existing structures such as an electromagnet type excitation method can be adopted.

A method of forming the magnet roll 1 will be described. First, as shown in FIG. 4, the fixed mold 12 is combined with the movable mold 11 on the right side, the molding space 15 in the main molding section 21 is closed by the shaft molding section 30, and the actuator 29 is driven. The slide mold 27 is moved to the forward position to minimize the volume of the molding space 15.

Next, as shown in FIG. 5, the injection cylinder is driven to inject and inject the molten magnet material into the molding space 15 through the injection port 31 of the resin supply nozzle 17, and the injection pressure of the molten magnet material is increased. The molding space 15 is filled with the molten magnet material while the slide die 27 is retracted to the retracted position by using. At this time, when a hydraulic cylinder is used as the actuator 29, the hydraulic oil is leaked while being throttled, so that a braking force is applied to the backward movement of the slide die 27. However, a braking force applying means for applying a braking force by friction or the like may be provided, and the braking force may be applied when the slide die 27 moves backward. Further, the slide mold 27 may be retracted while applying a braking force by the actuator 29 according to the injection and injection speed of the molten magnet material. Further, at this time, the molten magnetic material filled in the molding space 15 is solidified by magnetic field orienting means 26 provided on the outer peripheral portion of the main molding portion 21 as shown in FIG. Are aligned.

Next, as shown in FIG. 6, after the molten magnet material injected and solidified is solidified, the movable mold 11 is moved from the fixed mold 1 to the fixed mold 1.
2 is removed, and the slide type 2 is
7 is moved to the forward position, and the formed magnet roll 1 is taken out. The molded magnet roll 1 is slightly contracted by solidification, and can be easily removed by moving it in the axial direction.

Next, as another embodiment, as shown in FIG. 8, a molding die and a molding method of a shaft insert type magnet roll in which a metal or synthetic resin shaft is inserted will be described. The same members as the members having the above-mentioned numbers are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG.
No. 0, a metal or synthetic resin shaft 42 is insert-molded at the center of a roll portion 41 made of a magnet material, and both ends of the shaft 42 are connected to the shaft portion 4 of the magnet roll 40.
3, 44.

The molding die has substantially the same structure as that shown in FIG. 2, and if different parts are described, the right end of the shaft 42 is replaced with the slide die 27 as shown in FIGS. Using a slide mold 52 having a housing part 51 capable of housing a part other than the part, an injection port 53 is provided instead of the injection port 31 and opens toward a molding space where the roll portion 41 of the magnet roll 40 is formed. The mold 30 is provided with clamping means 54 capable of holding the right end of the shaft 42.

Next, a method of forming the magnet roll 40 will be described. First, as shown in FIG. 9, in a state where the shaft 42 is mounted in the accommodation portion of the slide die 52, the fixed substrate 12 is combined with the right side of the movable substrate 11 to form the molding space 15 in the main molding die 21 at the end. The slide mold 5 is closed by closing the mold 30 and driving the actuator 29.
2 is moved to the advanced position to minimize the volume of the molding space 15, and the right end of the shaft 42 is fixed to the end molding die 30 by the clamping means 54. If the shaft 42 is preheated to at least the temperature of the mold, distortion can be reduced due to the temperature difference, bending of the shaft 42 can be prevented, and adhesion to the magnet material can be improved,
Cracking and peeling of the magnet material can be prevented.

Then, as shown in FIG. 10, the injection cylinder is driven to inject and inject the molten magnet material from the manifold 16 into the molding space 15 through the injection port 31, and the slide mold 52 is injected by the injection pressure of the molten magnet material. Is filled into the molding space 15 with the molten magnet material being retracted to the retracted position. At this time, since the shaft 42 is fixed to the end forming die 30 by the clamp means 54, the shaft 42 is left in the forming space 15 by the retreating movement of the slide die 52 and is inserted into the molten magnet material. In addition, it is preferable to apply a braking force to the backward movement of the slide mold 52 as described above. At this time, during the period until the molten magnet material filled in the molding space 15 is solidified, the directions of the magnetic particles are aligned by the magnetic field orienting means 26 in the same manner as described above.

Next, as shown in FIG. 11, after the molten magnet material injected and solidified is solidified, the fixed substrate 12 is removed from the movable substrate 11 as described above, and the slide mold 52 is moved to the forward position by the actuator 29. Thereby, the magnet roll 40 is taken out.

In this embodiment, the two types of magnet rolls 1 and 40 are formed. In any case, when the molten magnet material is injected into the molding space 15, the volume of the molding space 15 is initially set. Is reduced and the molding space 15 is expanded in the left-right direction according to the injection speed, so that the flow of the molten magnet material in the molding space 15 is less likely to be disturbed, and the direction of the magnet particles dispersed in the magnet material is reduced. It is possible to obtain the magnet roll 1 which is constant and has magnetically uniform characteristics. Further, since only a small amount of air exists in the molding space 15, even if the molten magnet material is injected at a high speed, molding failure due to gas burning does not occur. In the insert molding, when the molten magnet material is injected into the molding space 15, the shaft 4
Since the slide mold 52 guides the entire area of the magnet 2, it is possible to prevent the shaft 42 from bending due to the flow pressure of the molten magnet material, and to obtain a magnetic material with no uneven thickness of the magnet material, Magnet roll 40 due to uneven thickness
Warpage can be prevented, and there is an advantage that dimensional accuracy is improved.

In the case of the former embodiment, when the molten magnet material is injected into the molding space 15, the injection is initially performed in the molding space 15.
Of the molten magnet material by reducing the volume of the molten magnet material and expanding the molding space 15 in the left-right direction according to the injection speed.
Disturbance is hardly generated in the flow in the magnet material 5, and the direction of the magnet particles dispersed in the magnet material is fixed, so that the magnet roll 1 having magnetically uniform characteristics can be obtained. Further, since only a small amount of air exists in the molding space 15, even if the molten magnet material is injected at a high speed, molding failure due to gas burning does not occur.

[0041]

According to the first aspect of the present invention, a projecting portion is formed that projects beyond the projecting portion projecting from the center of the resin supply nozzle end of the magnet roll to be formed, and the dimension up to this projecting portion is determined by the magnet. If the roll is manufactured in the lengthwise direction of the roll, it is possible to eliminate the work of scraping off the protrusions as in the conventional case, thereby shortening the forming time of the magnet roll and manufacturing the magnet roll. The cost can be reduced.
In addition, with a simple configuration just to form a mold storage section,
The above advantages can be realized, and the cost is further improved.

According to the first and third aspects, adjusting the magnetic field strength of the mold is performed by changing the position of the permanent magnet.
Alternatively, since the magnetic resistance between the permanent magnet and the tip yoke is changed, a mold is newly constructed using permanent magnets having different dimensions as in the related art, or the inner wall of the main mold and the pole piece ( It is not necessary to newly construct a mold having a different distance from the tip yoke), which is advantageous in terms of cost. In the case of the third aspect, compared with the case of the first aspect, the magnetic field strength of the mold can be adjusted over a wide range, and the position of the permanent magnet can be kept fixed. The magnetic field strength of the mold can be quickly adjusted, which is advantageous in handling.

According to the first aspect, by making the main molding die detachable from the exciting portion, when the inner surface needs to be replaced due to wear, only the main molding die can be replaced. In addition, the cost can be reduced as compared with the conventional method in which the entire mold is replaced. In addition, "burr" is applied to the magnet roll formed by the split mold.
And a good molded product can be obtained without generation of any.

According to the second aspect, by forming the magnetic path and the permanent magnet so as to be able to change the angle with respect to the outer peripheral edge of the main molding die, a mold having different positions of the magnetic path and the permanent magnet is manufactured. The peak angle position of the magnetic field pattern can be changed easily and inexpensively as compared with the magnetic field pattern.

According to the third aspect, when the magnet roll is formed, the main forming die does not move unexpectedly, so that the forming operation can be performed well as scheduled.

[Brief description of the drawings]

FIG. 1 is a perspective view of a magnet roll integrated with a magnet material.

FIG. 2 is a longitudinal sectional view of a mold for forming a magnet roll.

FIG. 3 is a sectional view taken along line II in FIG. 2;

FIG. 4 is an explanatory view showing a process of forming a magnet roll using a magnet roll forming mold.

FIG. 5 is an explanatory view showing a process of forming a magnet roll using a magnet roll forming mold.

FIG. 6 is an explanatory diagram showing a process of forming a magnet roll using a mold for forming a magnet roll.

FIG. 7 is an explanatory view showing how magnetic particles are oriented in a magnetic field.

FIG. 8 is a perspective view of a shaft insert type magnet roll.

FIG. 9 is an explanatory view showing a process of forming a magnet roll using a magnet roll forming mold.

FIG. 10 is an explanatory view showing a process of forming a magnet roll using a magnet roll forming mold.

FIG. 11 is an explanatory view showing a process of forming a magnet roll using a magnet roll forming mold.

FIG. 12 is a longitudinal sectional view showing another structure of a mold for forming a magnet roll.

FIG. 13 is a longitudinal sectional view showing another structure of a magnet roll forming mold.

FIG. 14 is a vertical cross-sectional view showing a form in which a mold for forming a magnet roll attacks.

FIG. 15 is a longitudinal sectional view showing another embodiment of a magnet roll forming mold.

FIG. 16 is a longitudinal sectional view of a main part showing an engaging part of the main mold.

FIG. 17 is an enlarged vertical sectional view showing an arrangement portion of a resin supply nozzle.

18A is an enlarged cross-sectional view showing one end of a formed magnet roll, and FIG. 18B is a view taken along line II-II in FIG.

FIG. 19 is a sectional view showing another structure of a mold for forming a magnet roll.

FIG. 20 is an enlarged cross-sectional view of the nozzle portion of FIG.

FIG. 21 is an enlarged longitudinal sectional view showing a conventional example of an arrangement portion of a resin supply nozzle.

FIG. 22 is an enlarged sectional view showing one end of the magnet roll formed according to FIG. 21;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnet roll 2 Roll part 3 Shaft part 4 Shaft part 5 Notch 6 Fixing member 7 Projection 8 Cooling water inlet / outlet 9 Base end yoke 10 Molding mold 11 Movable mold 12 Fixed mold 14 Molding unit 15 Molding space 16 Projection Part 17 Resin supply nozzle 17A Tip surface 17B Reservoir (peripheral groove) 18 Exciting part 19 Nonmagnetic material spacer 20 Back yoke 21 Main molding part 21M groove 22 Spacer block 23 Cooling water passage 24 Permanent magnet 25 Tip yoke 26 Magnetic field orienting means 27 Shaft part (sliding type) 28 Retaining plate 29 Actuator 30 Shaft part forming part 30A Cooling hole 31 Inlet 32 Magnetic particles 40 Magnet roll 41 Roll part 42 Shaft 43,44 Shaft part 51 Housing part 52 Slide type 53 Inlet 54 Clamping means 60,61 Split mold 62 Support member 63 End plate 64 Engagement member 64A Tip engagement part 65 Play 66 Fitting surface H, h interval

Claims (10)

[Claims] 1. A main forming part having a forming space for forming a roll part of a magnet roll is provided. Shaft forming parts for forming a shaft part of the roll part are provided at both ends of the main forming part. For forming a magnet roll facing the tip of a resin supply nozzle for filling a molten magnet material from at least one of the two shaft portion forming portions into the shaft portion forming portion from the axial direction thereof. In a mold, a magnet roll formed by forming a storage portion for setting a shaft end position of a magnet roll by injecting a molten magnet material filled by the nozzle into a tip end surface of the resin supply nozzle. Mold. 2. A shaping part, which is located on a side opposite to a side where the resin supply nozzle is arranged, is slidably mounted in a forming space with substantially no gap, and one end of a magnet roll is formed. The shaft forming part, which is located on the side where the resin supply nozzle is disposed, is detachably attached to the other side of the main forming part, and forms the other end of the magnet roll. And a magnetic field orienting means fixed to the main molding part so as to surround the molding space, and for orienting the magnetic particles of the molten magnet material filled in the molding space in one direction. The mold for forming a magnet roll according to claim 1, wherein the mold is provided. 3. A main molding die having a molding space for molding a roll portion of a magnet roll is provided, and the molding space is filled with a molten magnet material, and the filled magnetic particles of the molten magnet material are filled in one piece. A molding die for a magnet roll, wherein magnetic field orienting means for orienting in a direction is provided on an outer peripheral edge of the main molding die so as to surround the molding space, wherein the magnetic field orienting means comprises an outer peripheral edge of the main molding die. And a permanent magnet for giving a line of magnetic force to the main mold through the magnetic path. The position of the permanent magnet can be changed with respect to the magnetic path in the radial direction of the roll portion. A molding die for a magnet roll configured as described above. 4. A magnet that is slidably mounted in the molding space with substantially no gap and that forms one end of a magnet roll; and a magnet that is detachably attached to the other side of the main molding die. The molding die for a magnet roll according to claim 3, further comprising an end molding die for molding the other end of the roll. 5. A main molding die having a molding space for molding a roll portion of a magnet roll is provided, and the molding space is filled with a molten magnet material, and the filled magnetic particles of the molten magnet material are filled with one another. In a mold for forming a magnet roll, a magnetic field orienting means for orienting in a direction is provided on an outer peripheral edge of the main molding die so as to surround the molding space. And a permanent magnet for applying a magnetic field line to the main mold through the magnetic path, and changing means for changing the magnetic resistance between the permanent magnet and the magnetic path are provided. Mold for forming magnetic rolls. 6. The apparatus according to claim 6, wherein said changing means inserts a non-magnetic member between said permanent magnet and said magnetic path to change the magnetic resistance between said permanent magnet and said magnetic path. 5. A mold for molding the magnet roll according to 5. 7. A magnet that is slidably mounted in the molding space with substantially no gap and that forms one end of a magnet roll; and a magnet that is removably attached to the other side of the main molding die. 7. The molding die for a magnet roll according to claim 5, further comprising an end molding die for molding the other end of the roll. 8. A main mold having a molding space for molding a roll portion of a magnet roll, and a slide mold which is slidably mounted in the molding space with substantially no gap and forms one end of the magnet roll. Is provided, is detachably attached to the other side of the main mold, and
An end forming die for forming the other end of the magnet roll is provided, and magnetic field orientation means for orienting the magnetic particles of the molten magnet material filled in the molding space in one direction so as to surround the molding space. In a molding die for a magnet roll provided on an outer peripheral edge of a molding die, an excitation unit provided with the magnetic field orientation means and the main molding die are separately configured, and a main molding die is formed with respect to the excitation unit. A molding die for magnet rolls, characterized in that the mold is detachable. 9. The magnetic path according to claim 1, wherein the exciting section includes a plurality of magnetic paths arranged on an outer peripheral edge of the main mold, and a permanent magnet for emitting magnetic lines of force toward the magnetic paths. The molding die for a magnet roll according to claim 8, wherein the permanent magnet and the outer peripheral edge of the main molding die can be changed in angle. 10. The magnet roll according to claim 8, further comprising an engaging member which is engaged with an end of the main mold at an end of the main mold in a longitudinal direction to prevent the main mold from coming off. Mold for molding.