WO2016121571A1 - 成形装置、金型、マグネットロールの製造方法及びマグネットロールの着磁方法 - Google Patents
成形装置、金型、マグネットロールの製造方法及びマグネットロールの着磁方法 Download PDFInfo
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- WO2016121571A1 WO2016121571A1 PCT/JP2016/051417 JP2016051417W WO2016121571A1 WO 2016121571 A1 WO2016121571 A1 WO 2016121571A1 JP 2016051417 W JP2016051417 W JP 2016051417W WO 2016121571 A1 WO2016121571 A1 WO 2016121571A1
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
- G03G15/0942—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush with means for preventing toner scattering from the magnetic brush, e.g. magnetic seals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
- H01F13/003—Methods and devices for magnetising permanent magnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0273—Imparting anisotropy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0231—Magnetic circuits with PM for power or force generation
- H01F7/0247—Orientating, locating, transporting arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0273—Magnetic circuits with PM for magnetic field generation
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
- G03G15/0921—Details concerning the magnetic brush roller structure, e.g. magnet configuration
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/0551—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 in the form of particles, e.g. rapid quenched powders or ribbon flakes
Definitions
- the present invention relates to a molding apparatus, a mold, a method for manufacturing a magnet roll, and a method for magnetizing a magnet roll used for manufacturing a magnet roll used for a developing roll used for electrophotography, electrostatic recording, and the like.
- a magnet roll used for a developing roll in electrophotography, electrostatic recording, or the like is provided with a plurality of magnetic poles and non-magnetized portions in the circumferential direction, so-called desorption poles. Individual specifications are required for the position, number, size, and shape of the magnetic poles in the magnet roll, depending on the specifications of the developer to be adsorbed and the electrophotographic machine.
- Patent Document 1 discloses a magnet roll integrally formed with a so-called C-shaped cross section having a circular shape and a part of which is a cut-out detachment pole.
- Patent Document 2 discloses a magnet roll having a deformed cross section formed of a plurality of rod-shaped magnets in order to obtain a desired magnetic pole waveform.
- extrusion molding As one of the manufacturing methods of magnet rolls.
- extrusion molding When extruding a mixture of resin and magnetic powder as much as possible into a magnet roll by extrusion, there may be a problem that the extruded product is partially curved. This is due to the fact that when the mixture is pushed out of the mold, the resistance with the mold varies from site to site. This is because a portion having a large resistance is less likely to be pushed out than a portion having a small resistance.
- a step is formed on the surface of the molded product. Such a problem is more likely to occur when molding a molded article having an irregular cross section than those having a C-shaped cross section.
- the present invention has been made in view of the circumstances as described above, and provides a molding apparatus and the like that can suppress the bending of the molded product and the step of the surface when the molded product to be a deformed magnet roll is extruded. For the purpose.
- the C-shaped cross-section is a circular shape or a part of a curved surface forming a C-shaped cross section lacking a part of the circular shape, thereby forming a convex portion, a concave portion, and a flat portion.
- the cross-sectional shape which combined the convex part, the recessed part, the flat part, and the circular arc which changed the curvature may be sufficient.
- a complex irregular cross section refers to a case where unevenness is more severe than a cross section to be compared, or a case where there are a large number of combined shapes such as convex portions, concave portions, flat portions, and arcs.
- the molding apparatus includes a heating and kneading unit that supplies a kneaded material obtained by heating and kneading a raw material mixture containing ferromagnetic particles and a thermoplastic resin to a cylindrical mold, and the supplied kneaded material is supplied by the mold.
- a heating and kneading unit that supplies a kneaded material obtained by heating and kneading a raw material mixture containing ferromagnetic particles and a thermoplastic resin to a cylindrical mold, and the supplied kneaded material is supplied by the mold.
- the mold includes: The inlet of the kneaded material has a C-shaped cross section, and the outlet of the kneaded material has a more complicated cross section than the inlet.
- the mold has a kneaded product in which the inlet of the kneaded product has a C-shaped cross section and the outlet of the kneaded product has a more complicated modified cross section than the inlet, so that the kneaded product is supplied to the mold.
- the molding apparatus according to the present invention is characterized in that a sectional area of the inlet is equal to or larger than a sectional area of the outlet.
- the cross-sectional area of the mold is equal to or larger than the cross-sectional area of the outlet, there is little resistance when the kneaded material is supplied to the mold, and the magnet is formed when the deformed magnet roll is extruded.
- the curvature of the roll and the step on the surface can be suppressed.
- the molding apparatus according to the present invention is characterized in that, on the outlet side of the mold, there are a protruding portion that protrudes in the extrusion direction so as to surround the outlet, and a flange portion that is provided on the outer surface of the outlet side. .
- the molded product extruded from the mold can be quickly cooled, and deformation of the molded product can be prevented.
- the molding apparatus includes a cooling unit that cools the molded product of the kneaded product extruded from the outlet.
- the molded product extruded from the mold can be quickly cooled, and deformation of the molded product can be prevented.
- die which concerns on this invention is a metal mold
- the said cross-shaped deformed C-shaped entrance The inner surface has a portion whose diameter is continuously reduced toward the outlet of the irregular cross section.
- the mold has a portion in which the inner surface is continuously reduced in diameter from the C-shaped cross-section inlet to the outlet of the irregular cross-section, so that the kneaded material is supplied to the mold.
- the method for producing a magnet roll according to the present invention includes a heating and kneading step of heating and kneading a raw material mixture containing ferromagnetic particles and a thermoplastic resin, and supplying the heated and kneaded mixture to a cylindrical mold.
- a heating and kneading step of heating and kneading a raw material mixture containing ferromagnetic particles and a thermoplastic resin, and supplying the heated and kneaded mixture to a cylindrical mold.
- the kneaded material in the extrusion molding process, is gradually reduced in diameter from the irregular C-shaped cross section and is formed into a complex irregular cross-sectional shape than the irregular C-shaped cross section.
- the resistance at the time of being supplied to the mold is small, and when the deformed magnet roll is extruded, the curvature of the magnet roll and the step on the surface can be suppressed.
- the magnet roll magnetizing method according to the present invention is a magnet roll magnetizing method having a deformed cross section in which the central axis of the magnetic body is arranged at the center of the axis, and the yoke around which the magnetized coil is wound is connected to the magnet roll.
- the one yoke is arranged at a position closer to the central axis than the other yoke, and the one yoke is connected to another yoke adjacent to the yoke. Is characterized by generating magnetized magnetic fields in different directions.
- one yoke is disposed closer to the central axis than the other yoke, and the one yoke has a magnetizing magnetic field in a direction different from that of the other yoke adjacent to the yoke. Since it is generated, the surface magnetic flux density at a predetermined position of the magnet roll can be made zero.
- the curvature of the magnet roll and the step on the surface can be suppressed.
- FIG. 5 is a cross-sectional view taken along the line VV in FIG. 1. It is explanatory drawing which shows an example of a structure of a metal mold
- FIG. 6 is a longitudinal sectional view showing an example of a developing roll and an explanatory view showing an example of a surface magnetic flux density waveform of the developing roll. It is explanatory drawing which shows the magnetizing method of a magnet roll.
- FIG. 1 is an axial sectional view showing a main part of an extrusion molding machine (molding apparatus) 1.
- the extrusion molding machine 1 includes a cylinder 11, a screw 12, a mold attachment portion 13, a mold 14, an orientation magnet 15, and a magnetic material shaft 16.
- the cylinder 11 has a cylindrical shape and houses the screw 12 therein.
- a heating unit (not shown) is provided on the outer periphery of the cylinder 11. The heating unit is controlled so that the temperature inside the cylinder 11 becomes a suitable temperature.
- a band heater, a sheathed wire aluminum cast heater, or the like is used as the heating unit.
- the cylinder 11 is supplied with a magnet roll forming raw material (raw material mixture) by a hopper (not shown).
- the molding raw material is manufactured by mixing the ferromagnetic particles and the thermoplastic resin with a mixer, pulverizing the mixed mixture to several mm or less, and granulating the mixture.
- Ferromagnetic powders constituting the ferromagnetic particles include, for example, ferrite magnetic powder such as barium ferrite and / or strontium ferrite, strontium ferrite magnetic powder containing La and Co, calcium ferrite magnetic powder containing La and Co, or R-Co series.
- it is a rare earth magnetic powder such as R—Fe—B or R—Fe—N, or a mixed powder of the ferrite magnetic powder and the rare earth magnetic powder.
- thermoplastic resin examples include polyethylene, vinyl chloride, polyacetal, EEA (Ethylene-Ethyl-Acrylate: ethylene-ethyl acrylate copolymer) resin, EVA (Ethylene-Vinyl Acetate: ethylene-vinyl acetate copolymer), ABS (Acrylonitrile, Butadiene, Styrene: acrylonitrile, butadiene, styrene copolymer) resin and the like.
- EEA Ethylene-Ethyl-Acrylate: ethylene-ethyl acrylate copolymer
- EVA Ethylene-Vinyl Acetate: ethylene-vinyl acetate copolymer
- ABS Acrylonitrile, Butadiene, Styrene: acrylonitrile, butadiene, styrene copolymer
- the screw 12 rotates inside the cylinder 11 and conveys the forming raw material from the right to the left in FIG. 1 while kneading the forming raw material.
- the heating and kneading section referred to in this specification includes a cylinder 11, a screw 12, a heating section, and the like.
- the mold mounting part 13 is cylindrical and has a hollow structure with a reduced diameter.
- a cylinder 11 is connected to one end side having a large diameter, and a mold 14 is fixed to the other end side having a reduced diameter.
- FIG. 2 is an explanatory view showing an example of the configuration of the mold 14. Shown on the right side of FIG. 2 is a plan view of the inlet 144a to which the kneaded material is supplied. 2 is a side view of the mold 14. Shown on the left side of FIG. 2 is a plan view of the outlet 144b through which the molded product obtained by molding the kneaded product is extruded.
- the mold 14 has a cylindrical shape and includes a shaft storage portion 145 at the center of the shaft.
- the shaft storage portion 145 has a center hole for storing a shaft of a magnetic material used when magnetically orienting the kneaded material at the center, and forms an inner peripheral side of a C-shaped irregular cross section.
- a passage 144 is formed around the shaft storage portion 145. 2 is a portion where a plurality of walls forming the flow path 144 are connected (indicating bending points on the inner surface of the mold 14) and the center hole of the shaft storage portion 145. Etc.
- the outlet 144b through which the molded product is extruded has an irregular shape following the magnet roll.
- the inlet of the flow path 144 that is, the inlet 144 a of the forming raw material is different from the outlet, and has an irregular shape close to a C shape.
- the cross-sectional shape of the outlet 144b is more complicated than the cross-sectional shape of the inlet 144a. In other words, in the cross section, the difference in the distance from the central axis of the concave portion adjacent to the outlet 144b and the convex portion is larger than the difference in the distance from the central axis of the concave portion adjacent to the inlet 144a.
- the inlet 144a and the outlet 144b of the mold 14 have the same outer diameter of the shaft storage portion 145, and the inner diameter on the inlet 144a side is larger than that of the outlet 144b.
- the sectional area of the inlet 144a of the mold 14 is set to be equal to or larger than the sectional area of the outlet 144b.
- the inner surface of the mold 14 has a reduced diameter portion 144c that is inclined toward the center for a predetermined distance from the inlet 144a.
- the extrusion molding section referred to in the present specification includes a mold mounting section 13 and a mold 14.
- a plurality of orienting magnets 15 are arranged on the outer periphery of the mold 14 near the outlet 144b.
- the orientation magnet 15 (magnetic field generating part) plays a role of magnetically orienting the kneaded material.
- the orientation magnet 15 is a permanent magnet such as a bond magnet or a neodymium magnet. Instead of the permanent magnet, an electromagnet in which a coil is wound around the yoke and the yoke may be used as the orientation magnet 15.
- the magnetic body shaft 16 is inserted and arranged in the center hole of the shaft housing portion 145 of the mold 14.
- FIG. 3 is a flowchart showing an example of a magnet roll manufacturing process.
- the manufacturing process of the magnet roll includes a heating and kneading process (step S1), an extrusion molding process (step S2), a magnetic field orientation process (step S3), a cooling process (step S4), and a magnetization process (step S5).
- step S1 the molding material charged from the hopper (not shown) of the extruder 1 is heated by the heater (not shown).
- the forming raw material is kneaded by the screw 12 and transferred in the cylindrical cylinder 11 from the right side to the left side in FIG.
- step S2 an extrusion molding process is performed (step S2).
- the kneaded material B transferred through the cylinder 11 by the screw 12 is supplied to the mold 14 through the mold mounting portion 13.
- the kneaded material B is molded by passing through the mold 14.
- the magnetic field orientation process (step S3) is performed in parallel at the final part of the extrusion process.
- the orienting magnet 15 is disposed near the outlet of the mold 14.
- the kneaded product B is magnetically oriented by the orientation magnet 15 before being extruded from the mold 14. That is, the magnetic field direction of the kneaded material B is determined by orienting the ferromagnetic particles contained in the kneaded material B in a predetermined direction.
- the molding raw material supplied to the mold 14 is naturally cooled gradually while passing through the mold 14, but has a viscosity necessary for orienting the ferromagnetic particles in the orienting step.
- step S4 a cooling process is performed (step S4).
- the molded kneaded product extruded from the mold 14, that is, the molded product, is cooled by a cooling liquid or the like.
- the molded product is finally solidified by being cooled.
- the final solidified molded product is cut into a predetermined length, and a magnetizing process is performed (step S5).
- the magnetizing step the molded product is magnetized by a magnetizing magnet including a yoke made of a soft magnetic material and a coil (magnetizing coil) wound around the yoke, thereby completing a magnet roll. Details will be described later.
- FIG. 4 is an explanatory view showing an example of an end face of the magnet roll 4.
- FIG. 4 shows an irregular shape in which a C-shaped shape with a part of a cylindrical shape is deformed, and a flat part, a concave part recessed in the radial direction, and curved parts with different curvatures are provided in part.
- FIG. 4 shows the end face of the magnet roll 4.
- the end surface of the magnet roll 4 includes a first curved surface portion 41, a second curved surface portion 46, a third curved surface portion 48, a fourth curved surface portion 50, a first flat portion 43, a second flat portion 45, a first connecting portion 42, a first connecting portion 42, 2 connection part 44, 3rd connection part 47, 4th connection part 49, and keyway part 51 are included.
- Each of the first curved surface portion 41, the second curved surface portion 46, the third curved surface portion 48, and the fourth curved surface portion 50 is a part of an arc centered on the axis center when the magnet roll 4 is viewed from the end surface. Yes.
- the radius of each arc may be the same length, or the radius of some arcs may be the same and the radius of the remaining arcs may be different.
- the length of the radius of each arc is appropriately determined according to the specification of the surface magnetic flux waveform of the magnet roll 4.
- the first flat portion 43 and the second flat portion 45 are substantially perpendicular to the radius of a circle centered on the axis center when viewed in plan from the end face of the magnet roll 4. That is, the normal direction of the plane including the first flat portion 43 and the second flat portion 45 is substantially parallel to the radial direction.
- the first connection part 42 connects the first curved surface part 41 and the first flat part 43.
- the first connecting portion 42 has a shape in which two straight lines are connected.
- the first connecting portion 42 is a concave portion when viewed from the outer peripheral surface, and has a groove shape as a whole.
- the second connection part 44 connects the first flat part 43 and the second flat part 45.
- the shape of the second connection portion 44 is the same as that of the first connection portion 42.
- the third connecting portion 47 connects the second curved surface portion 46 and the third curved surface portion 48.
- the shape of the 3rd connection part 47 has comprised the straight line, when the magnet roll 4 is planarly viewed from an end surface.
- the fourth connecting portion 49 connects the third curved surface portion 48 and the fourth curved surface portion 50.
- the shape of the fourth connection portion 49 is the same as that of the third connection portion 47.
- the key groove 51 is a groove into which a key for fixing the magnet roll 4 and the central axis of the magnet roll 4 is inserted.
- the numbers of the curved surface portions, flat portions, and connecting portions of the magnet roll 4 shown in FIG. 4 are merely examples. How to combine the curved surface portion, the flat portion, and the connection portion is appropriately determined according to the specification of the surface magnetic flux waveform of the magnet roll 4.
- the conventional mold In extrusion molding of a molded product to be a magnet roll, the conventional mold has the same shape at the inlet and outlet. Therefore, when molding a molded product with a complicated profile, the inlet and outlet have the same profile. .
- the inner cross section of the mold attachment portion 13 is circular, the kneaded product pushed out by the screw 12 is supplied into the mold from the mold inlet having an irregular cross section in a circular cross section. Since the irregular cross-section mold has more irregularities than the circular or C-shaped cross section, the frictional resistance between the mold and the kneaded material at the mold entrance is large. Further, when moving inside the mold, there is a partial difference in resistance between the mold and the kneaded material.
- the inlet 144a of the mold 14 is simpler than the outlet 144b and has a wide opening.
- the resistance at the time of a kneaded material being supplied from the inlet 144a becomes small.
- the reduced diameter portion 144c is provided, the kneaded material is gradually formed from a substantially C-shaped irregular shape to a complicated irregular shape, and therefore the resistance when flowing in the mold 14 is also higher than that of the conventional mold. Is also reduced.
- the resistance between the mold 14 and the kneaded product is smaller than that of the conventional mold, even if the extrusion speed of the kneaded product is increased, molding can be performed without causing the above-described problems.
- FIG. 5 is a cross-sectional view taken along the line VV in FIG. In FIG. 5, cross-sectional hatching is omitted.
- a plurality of orienting magnets 15 are arranged in the circumferential direction of the outer surface of the mold 14. The arrangement of the orientation magnets 15 is determined by the cross-sectional shape of the molded product and the specifications of the magnetic poles to be formed.
- the orientation magnet 15 and the magnetic material shaft 16 constitute a magnetic circuit.
- the curve denoted by reference numeral 15 a indicates the flow of magnetic flux in the magnetic circuit formed by the orientation magnet 15 and the magnetic material shaft 16.
- FIG. 6 is an explanatory diagram showing an example of the configuration of the mold.
- the mold 14 further includes a flange portion 142 and a protruding portion 143 in addition to the main body portion 141, the channel 144, and the shaft storage portion 145.
- description of the same parts as those in the first embodiment will be omitted.
- a protrusion 143 that protrudes in the extrusion direction of the molded product is provided on the outlet 144b side of the mold 14 so as to surround the outlet 144b.
- a flange portion 142 that extends radially outward is provided near the base of the protruding portion 143.
- the protruding portion 143 protrudes from the end of the flange portion 142 in the forward direction of the outlet 144 b of the flow path 144.
- the protruding portion 143 forms a wall that surrounds the periphery of the outlet 144b.
- FIG. 7 is a longitudinal sectional view showing a main part of the extrusion molding machine 1 to which the cooling unit 2 is connected.
- the cooling unit 2 has a cylindrical shape, and a liquid supply port 21 a is provided on the surface facing the mold 14 so as to surround the molded product extruded from the mold 14.
- the cooling unit 2 is arranged coaxially with the mold 14.
- the cooling section 2 is provided with a coolant supply path 21 connected to the liquid supply port 21a.
- the molded product extruded from the outlet 144b of the mold 14 is still in a state where the temperature is high and easily deformed when extruded from the outlet 144b. Therefore, sufficient cooling is required by the cooling unit 2. As shown in FIG.
- the cooling liquid that has passed through the liquid supply path 21 is supplied from a liquid supply port 21 a provided in the vicinity of the outlet of the mold 14 to cool the molded product.
- the coolant is, for example, tap water or industrial water, but is not limited thereto, and may be circulating water or other refrigerant.
- the mold portion 14 is provided with a flange portion 142 and a protruding portion 143.
- the coolant supplied from the liquid supply port 21a stays around the molded product, so that the molded product can be efficiently cooled. Thereby, it becomes possible to prevent deformation of the molded product.
- FIG. 8 is a longitudinal sectional view showing an example of the developing roll 6 and an explanatory view showing an example of a surface magnetic flux density waveform of the developing roll 6.
- the developing roll 6 includes a magnet roll 61, a central shaft 62, and a sleeve 63.
- the magnet roll 61 is the same as the magnet roll 4 described in the first or second embodiment.
- the central axis 62 is an axis arranged at the axial center of the magnet roll 61.
- the sleeve 63 has a cylindrical shape, and stores a magnet roll 61 having a central shaft 62 disposed in a hollow portion.
- the peripheral surface of the developing roll 6 has N poles and S poles arranged alternately along the circumferential direction.
- the magnetic poles of the developing roll 6 can be classified into, for example, a main magnetic pole 6a, an auxiliary magnetic pole 6b, and a desorption pole 6c.
- the main magnetic pole 6a is a magnetic pole used for adsorbing the powder toner used in development to the surface of the sleeve 63.
- the auxiliary magnetic pole 6b is a magnetic pole for assisting the magnetic formation of the main magnetic pole 6a.
- the desorption pole 6 c is provided to desorb the powder toner adsorbed on the sleeve 63.
- the desorption pole 6c preferably has a magnetic flux density of zero.
- the shape of the magnet roll 61 at a position corresponding to the desorption pole 6c is a portion where there is no magnet and the central shaft 62 is exposed.
- the said part is called a notch for convenience.
- a sector is formed by the notch and the central shaft 62 and a part of the sleeve 63.
- the angle of the central angle ⁇ of the sector is about 70 degrees.
- the angle of the central angle ⁇ is referred to as a notch angle.
- FIG. 9 is an explanatory view showing a magnetizing method of the magnet roll 61. Magnetization of the magnet roll 61 is performed after the center shaft 62 of the magnetic body is inserted into the center of the shaft.
- the magnetizing device (magnetizing part) 7 includes a plurality of electromagnets 71, 72, 73.
- the electromagnets 71, 72, and 73 are provided along the substantially circumferential direction of the magnet roll 61.
- Each of the electromagnets 71, 72, 73 includes a yoke 7a formed of a soft magnetic material and a coil 7b wound around the yoke 7a.
- a predetermined current is passed through each coil 7b by an excitation unit (not shown) to generate a required magnetic pole direction and a required magnetic field (magnetization magnetic field).
- the yokes 7 a of the electromagnets 71, 72, and 73 are arranged so that the directions of the magnetic fields generated in the electromagnets 71, 72, and 73 are substantially the radial direction of the magnet roll 61.
- the magnet roll 61 is magnetized along the axial direction by moving from the back side to the front side.
- the yoke 7a and the coil 7b connected in the front and back direction of the paper surface may be prepared corresponding to the length of the magnet roll 61 and magnetized at a time.
- the electromagnet 71 magnetizes the main magnetic pole.
- Each of the plurality of electromagnets 72 magnetizes the auxiliary magnetic pole.
- the electromagnet 73 is an electromagnet for preventing the desorption pole from being magnetized. The provision of the electromagnet 73 is a different part from the conventional one.
- the significance of providing the electromagnet 73 for the desorption pole will be described below. As described above, it is desirable that the magnetic flux density of the desorption pole is 0. However, when the same magnetic pole exists adjacent to the desorption pole, the adjacent magnetic pole and the magnetic pole of opposite polarity (isopolarity) are desorbed. May occur at pole locations. In the example shown in FIG. 8, since the auxiliary magnetic pole adjacent to the desorption pole 6c is an N pole, an S pole may occur in the desorption pole 6c.
- the angle of the notch constituting the desorption pole is small, for example, about 40 degrees, the portions in contact with the desorption pole (both ends of the C-shaped cross section) are pushed out from the adjacent magnetic poles. A magnetic pole is not formed in the site
- the angle of the notch is set to 70 degrees as shown in FIG. 8, adjacent opposite poles are pushed out and a magnetic pole is formed at the position of the desorption pole 6c. In order to cancel this, an electromagnet 73 is provided and magnetized.
- the magnetic field generated in the electromagnet 73 is opposite to the magnetic field generated in the electromagnets 72 located on both sides. Further, it is desirable that the tip portion of the yoke 7a of the electromagnet 73 is at least inside the outermost part of the magnet roll 61 that forms the magnetic poles on both sides of the desorption pole 6c. It is further desirable that the tip portion of the yoke 7a of the electromagnet 73 be close to the extent that it contacts the central shaft 62.
Abstract
Description
以下、本発明をその実施の形態を示す図面に基づき具体的に説明する。
図1は押出成形機(成形装置)1の主要部を示す軸断面図である。押出成形機1は、シリンダ11、スクリュー12、金型取付部13、金型14、配向用磁石15、磁性体軸16を含む。
強磁性体粒子を構成する強磁性粉末は、例えば、バリウムフェライト及び/又はストロンチウムフェライト等のフェライト磁粉、La及びCoを含有するストロンチウムフェライト磁粉、La及びCoを含有するカルシウムフェライト磁粉またはR-Co系もしくはR-Fe-B系やR-Fe-N系のような希土類系の磁粉、若しくは前記フェライト磁粉と前記希土類系の磁粉の混合粉である。
熱可塑性樹脂は、例えばポリエチレン、塩化ビニール、ポリアセタール、EEA(Ethylene-Ethyl-Acrylate:エチレンーエチルアクリレート共重合体)樹脂、EVA(Ethylence-Vinyl Acetate:エチレンー酢酸ビニール共重合体)、ABS(Acrylonitrile、Butadiene、Styrene:アクリロニトリル、ブタジエン、スチレン共重合体)樹脂等である。
出口144bの断面形状は入り口144aの断面形状より複雑となっている。
言い換えると断面において出口144bの隣り合う凹部と凸部の中心軸からの距離の差は入口144aの隣り合う凹部と凸部の中心軸からの距離の差に比べて大きくなっている。
図6は、金型の構成の一例を示す説明図である。実施の形態2において、金型14は、本体部141、流路144、軸収納部145に加えて、フランジ部142、突出部143を更に含む。以下の説明においては、実施の形態1と同様な部分は説明を省略する。
次に、実施の形態1及び実施の形態2におけるマグネットロールの着磁方法について、説明する。図8は現像ロール6の一例を示す縦断面図及び現像ロール6の表面磁束密度波形の一例を示す説明図である。現像ロール6はマグネットロール61、中心軸62、スリーブ63を含む。
今回開示された実施の形態はすべての点で例示であって、制限的なものでは無いと考えられるべきである。本発明の範囲は、上記した意味では無く、特許請求の範囲によって示され、特許請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。
11 シリンダ
12 スクリュー
13 金型取付部
14 金型
141 本体部
142 フランジ部
143 突出部
144 流路
144a 入口
144b 出口
144c 縮径部
145 軸収納部
15 配向用磁石
16 磁性体軸
2 冷却部
21 給液路
21a 給液口
4 マグネットロール
41 第1曲面部
42 第1接続部
43 第1平坦部
44 第2接続部
45 第2平坦部
46 第2曲面部
47 第3接続部
48 第3曲面部
49 第4接続部
50 第4曲面部
51 キー溝部
6 現像ロール
6a 主磁極
6b 補助磁極
6c 脱離極
61 マグネットロール
62 中心軸
63 スリーブ
7 着磁装置(着磁部)
71、72、73 電磁石
7a ヨーク
7b コイル
Claims (7)
- 強磁性粒子及び熱可塑性樹脂を含む原料混合物が加熱混練された混練物を筒状の金型に供給する加熱混練部と、供給された混練物を前記金型により成形する押出成形部と、前記金型の長手方向端部に配置され金型内部に磁界を発生させる磁界発生部とを備え、異形断面のマグネットロールを成形する成形装置において、
前記金型は、前記混練物の入口が断面異形C字状をなし、前記混練物の出口が前記入口よりも複雑な異形断面をなす
ことを特徴とする成形装置。 - 前記入口の断面積は、前記出口の断面積以上である
ことを特徴とする請求項1に記載の成形装置。 - 前記金型の出口側には出口を囲うように押出方向に突出する突出部と、前記出口側の外面に周設されたフランジ部とを有する
ことを特徴とする請求項1又は請求項2に記載の成形装置。 - 前記出口より押出された混練物の成形物を冷却する冷却部を備える
ことを特徴とする請求項1から請求項3のいずれか一項に記載の成形装置。 - マグネットロールを押出成形するための金型において、
断面異形C字状の入口及び該入口よりも複雑な異形断面の出口を有し、
前記断面異形C字状の入口から前記異形断面の出口に向かって内面が連続して縮径する部分を有する
ことを特徴とする金型。 - 強磁性粒子及び熱可塑性樹脂を含む原料混合物を加熱混練し、加熱混練された混練物を筒状の金型に供給する加熱混練工程と、供給された混練物を前記金型により成形する押出成形工程と、成形された成形物の強磁性体粒子を配向させる磁界配向工程とを備える異形断面のマグネットロールの製造方法において、
前記押出成形工程で、前記混練物は異形C字状断面から徐々に縮径されるとともに前記異形C字状断面よりも複雑な異形断面状に成形される
ことを特徴とするマグネットロールの製造方法。 - 軸中心に磁性体の中心軸を配置した断面異形のマグネットロールの着磁方法であって、
着磁コイルを巻回したヨークを、前記マグネットロールの磁極となすべき複数の位置それぞれに対応して配置し、
一のヨークは、他のヨークよりも中心軸に近い位置に配置し、
前記一のヨークには、該ヨークに隣り合う他のヨークとは異なる方向の着磁磁界を発生させる
ことを特徴とするマグネットロールの着磁方法。
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JP2016571958A JP6390719B2 (ja) | 2015-01-28 | 2016-01-19 | 成形装置、金型及びマグネットロールの製造方法 |
CN201680006221.7A CN107209471B (zh) | 2015-01-28 | 2016-01-19 | 成型装置、模具、磁力辊的制造方法以及磁力辊的磁化方法 |
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JP2020003640A (ja) * | 2018-06-28 | 2020-01-09 | コニカミノルタ株式会社 | マグネットローラー、現像ローラー、現像装置および画像形成装置 |
JP2021125494A (ja) * | 2020-02-03 | 2021-08-30 | 日立金属株式会社 | マグネットロール成形用金型及びマグネットロールの製造装置 |
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