Method of fabricating a permanent magnet

Details Method of fabricating a permanent magnet Method of fabricating a permanent magnet

1982-05-27

1985-01-29

Harris, George

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With coupling between charger and mold

425511, 425DIG33, 335303, B29F 103

Patent

active

044963033

ABSTRACT:
A plastic bonded magnet is formed of a solidified mixture of thermoplastic powder and magnetic particles capable of being permanently magnetized. The magnet in one form is cylindrical and provided with a coaxial bore. The particles are substantially uniformly dispersed throughout the magnet in coaxial sections extending between the cylinder axis and the periphery of the magnet. Also the particles are substantially commonly aligned throughout. A given quantity of the particles may be orientable which leads to the common alignment.
The method of fabricating the magnet includes the steps of mixing quantities of plastic material and solid magnetizable particles to obtain a substantially uniform mixture. The mixture is injection molded to form the magnetic body, the molding step including the injection of the mixture into a cavity having a form of the body, primarily cylindrical, and through a disc-shaped gating orifice on the aforesaid axis, which is midway between the body ends. The orifice opens radially into the cavity uninterruptedly completely around said axis whereby the molten mixture fills the cavity uniformly radially from the axis and the perimeter of the orifice. Upon solidification of the molten plastic, the particles will be secured in position.

REFERENCES:
patent: 3985588 (1976-10-01), Lyman
patent: 4010434 (1977-03-01), Kools

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