| 摘要 |
A method and apparatus for manufacturing magnet wire (24) continuously so that coatings of a flowable resin material (116) may be applied concentrically to a moving elongated filament (24) in thichnesses of about 16 mm or less. The filament can be a bare copper or aluminum conductor of round or rectangular configuration or an insulated conductor upon which a top or an intermediate coat of material may be applied. Magnet wire can be manufactured by continuously drawing the wire to size, annealing the wire, if necessary, insulating the wire with one or more coats of flowable resin material, curing the resin material, if necessary, hardening (20) the resin material, and spooling (22) the wire for shipment, without interruption at speeds limited only by the filament pay-off and take-up devices (12, 22) used. The apparatus of the invention utilizes the flowable resin material to centre the filament in a die, and the size (82) of the die (18) controls the thichness of the coat to be applied. Only the resin materia being applied to the filament is in contact with the filament, so that the wear normally associated with centering dies is eliminated. The apparatus and method of the invention can be used to apply coats several times thinner than is possible with conventional extrusion apparatus and of materials different from those conventionally extruded onto filaments. |
