| Abstrakt: |
Bonded magnets can be manufactured by compression molding, extrusion, injection molding or calendering processes. For compression molding, the magnet powders coated with epoxies are compression molded into required geometries and then cured at an appropriate temperature. Bonded magnets manufactured by this process can be held to tight tolerances, which eliminates the need for secondary or finish machining. For injection molding, extrusion and calendering processes, the magnet powders are first blended with polymers and polymer additives. The mixture is then intensively mixed together at a certain temperature by a compounder to form a ˵compound″. The compound can then be extruded, injection-molded or calendered. The binder that holds the magnet particles together may produce either a flexible or a rigid bonded magnet. Typical binders for flexible bonded magnets are elastomers, such as nitrile rubber or vinyl. Typical binders for rigid bonded magnets include thermoplastics, thermosetting polymers, and in some cases, metallic binders. [ABSTRACT FROM AUTHOR] |
