Electric heating – Metal heating – By arc
Patent
1993-08-30
1996-11-26
Evans, Geoffrey S.
Electric heating
Metal heating
By arc
156180, 1562728, 219 7614, 21912164, B23K 2600, B21F 4500, B29C 4102, B29C 7104
Patent
active
055782272
ABSTRACT:
A model making method and apparatus projects a linearly polarized laser beam from a laser source onto a mirror for circularly polarizing the beam and directing the circularly polarized beam vertically toward a rectilinearly movable stage for fusing a rectangular wire to a substrate or a previously fused wire layer on the stage. The circularly polarized beam projects through a center of a spool and a rotary stage and a support for the rotary stage and a rotary arm which is mounted on the rotary stage. The rotary arm supports a stepper feeder which draws the wire from the spool and pushes the wire through a nozzle, which radiuses the wire so that it lies flat and releases the wire near a focused spot of the circularly polarized laser beam. The rotating arm carries a lens mount on a pivot so that the lens which focuses the beam may traverse the wire for cutting the wire. Movement of the rectilinearly movable stage in a X-Y direction is controlled by a computer and stepper motors to follow a predetermined pattern of a cross-section of the model. The rotary arm turns on the rotary stage to release the wire tangentially to curvatures in the model outline. After each complete layer, the stage is stepped downward one wire thickness and the next layer is formed. The nozzle includes a gas jet passage for flooding the wire with inert gas as it is fused.
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Creighton Wray James
Evans Geoffrey S.
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