Molding Device, Metal Mold, Method of Manufacturing Magnet Roll and Method of Magnetizing Magnet Roll

Patent metadata

Field	Value
Publication number	US-2017371273-A1
Application number	US-201615543184-A
Country	US
Kind code	A1
Filing date	Jan 19, 2016
Priority date	Jan 28, 2015
Publication date	Dec 28, 2017
Grant date	—

Abstract

A molding device for molding a magnet roll with a profiled cross-section comprises a heating and kneading unit that supplies, to a cylindrical metal mold, a kneaded material obtained by heating and kneading a raw mixture including ferromagnetic particles and thermoplastic resin, an extrusion molding unit that molds the supplied kneaded material by the metal mold, and a magnetic field generating unit disposed at an end portion of the metal mold in a lengthwise direction that generates a magnetic field inside the metal mold, and the metal mold has a profiled C-shaped cross-section at an inlet for the kneaded material and a profiled cross-section at an outlet for the kneaded material more complex than the inlet.

First claim

1 - 7 . (canceled)

8 . A molding device for molding a magnet roll with a profiled cross-section, comprising:
a heating and kneading unit that supplies, to a cylindrical metal mold, a kneaded material obtained by heating and kneading a raw mixture including ferromagnetic particles and thermoplastic resin; an extrusion molding unit that molds the supplied kneaded material by the metal mold; and a magnetic field generating unit disposed at an end portion of the metal mold in a lengthwise direction that generates a magnetic field inside the metal mold, wherein the metal mold has a profiled C-shaped cross-section at an inlet for the kneaded material and a profiled cross-section at an outlet for the kneaded material more complex than the inlet.

9 . The molding device according to claim 8 ,
wherein the inlet has a cross-sectional area equal to or larger than the cross-sectional area of the outlet.

10 . The molding device according to claim 8 ,
wherein the outlet of the metal mold is provided with a protruding portion that protrudes in an extrusion direction so as to encircle the outlet and a flange portion that is circumferentially provided on an outer surface of the outlet.

11 . The molding device according to claim 8 , further comprising:
a cooling unit that cools a molding formed of the kneaded material that has been extruded from the outlet.

12 . A metal mold for extruding and molding a magnet roll, comprising:
an inlet having a profiled C-shaped cross-section; an outlet having a profiled cross-section more complex than the inlet; and a diminishing-diameter portion where an internal surface progressively diminishes in diameter from the inlet having the profiled C-shaped cross-section to the outlet having the profiled cross-section.

13 . A method of manufacturing a magnet roll with a profiled cross-section, comprising:
a heating and kneading step of heating and kneading a raw mixture including ferromagnetic particles and thermoplastic resin and supplying the kneaded material that has been heated and kneaded to a cylindrical metal mold; an extrusion molding step of molding the supplied kneaded material by the metal mold; and a magnetic field orientation step of orienting the ferromagnetic particles in the molded molding, wherein in the extrusion molding step, the kneaded material is molded to have a profiled cross-section more complex than a C-shaped cross-section while gradually diminishing in diameter from the C-shaped cross-section.

14 . A method of magnetizing a magnet roll with a profiled cross-section having a magnetic central shaft about a central axis, comprising:
disposing a yoke around which a magnetization coil is wound at a position corresponding to each of a plurality of positions where magnetic poles of the magnet roll are to be formed; disposing one yoke at a position closer to the central shaft than another yoke; and causing the one yoke to generate a magnetization magnetic field in a direction different from directions of other yokes adjacent to the one yoke.

Assignees

• Hitachi Metals Ltd

Inventors

• Taniguchi Osamu
• Orimo Masahiko

Classifications

• H01F13/003

  Methods and devices for magnetising permanent magnets (permanent magnets H01F7/02) · CPC title

• H01F41/0266

  Moulding; Pressing (H01F41/0273 takes precedence; hard magnetic particles H01F1/06, H01F1/11) · CPC title

• H01F7/0247

  Orientating, locating, transporting arrangements · CPC title

• G03G15/0942 Primary

  with means for preventing toner scattering from the magnetic brush, e.g. magnetic seals · CPC title

• H01F1/0551

  in the form of particles, e.g. rapid quenched powders or ribbon flakes · CPC title