Method for producing a magnet roll

Details Method for producing a magnet roll Method for producing a magnet roll

1992-12-21

1995-01-31

Cuda, Irene

Metal working

Method of mechanical manufacture

Roller making

492 8, B23P 1500

Patent

active

053849574

ABSTRACT:
A method of producing a magnet roll in which a magnetic property comparable to that obtained by an injection molding can be obtained in spite of an extrusion molding. According to a first embodiment, the yoke width of the magnetic-field extrusion die is varied along an extrusion direction. According to a second embodiment, a pipe filled with resin bonded magnet material is used as a shaft. According to a third embodiment, a shaft having a groove which is filled with magnet is used. According to a fourth embodiment, a shaft provided with surface magnetic charge is used. According to a fifth embodiment, a magnetized region of a shaft is set to be shorter than the length of a main magnet. According to a sixth embodiment, an extruded matter is moved while stored in a sizing metal mold having a magnetic circuit structure. According to a seventh embodiment, a sizing metal mold for storing an extruded matter therein is installed into a heating device and a cooling device equipped with a magnetic circuit structure while storing an extruded matter therein. According to an eighth embodiment, a preliminary magnetization is carried out with magnetic poles whose number is smaller than a finally-required number of magnetic poles, and then a re-magnetization is carried out with the finally-required number of magnetic poles.

REFERENCES:
patent: 3149403 (1964-09-01), Aurich et al.
patent: 4517719 (1985-05-01), Okumura et al.
patent: 4640808 (1987-02-01), Okumura et al.
Patent Abstracts of Japan, vol. 11, No. 198 (E-519) Jun. 25, 1987.
Patent Abstracts of Japan, vol. 13, No. 555 (M-904) Dec. 11, 1989.
Patent Abstracts of Japan, vol. 10, No. 58 (E-386) Mar. 7, 1986.
Patent Abstracts of Japan, vol. 12, No. 150 (E-606) May 10, 1988.

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