Metal treatment – Process of modifying or maintaining internal physical... – Producing or treating layered – bonded – welded – or...
Patent
1991-12-17
1993-12-21
Yee, Deborah
Metal treatment
Process of modifying or maintaining internal physical...
Producing or treating layered, bonded, welded, or...
148687, 148679, C21D 952
Patent
active
052717771
ABSTRACT:
Mill annealed commercial insulated copper wire 20 used to fabricate high Residual Resistivity Ratio (RRR) windings 12 is unwound from a supply spool 22 and wound onto an annealing spool 24, annealed on the annealing spool 24, and unwound from the annealing spool 24 and wound onto an actuator bobbin 18. The annealing spool 24 is selected to have the same outside diameter as the actuator bobbin 18. The temperature of a single layer of wire 32 on the annealing spool 24 is raised in an incremental fashion to an annealing temperature in a vacuum furnace. The annealing spool 24 is held at the annealing temperature for a period of time at least equal to the annealing time required for the single layer of wire 32 and not longer than the survival time of an insulative coating on the single layer of wire 32. After annealing, the annealing spool 24 is cooled naturally to room temperature partially under vacuum and partially in an inert gas atmosphere. A high RRR wire 34 resulting from annealing is unwound from the annealing spool 24 and wound onto the actuator bobbin 18. During unwinding and winding tension and bend radius is controlled. Also, a heat conductive coating for removing heat from the winding is simultaneously applied to the annealed insulated copper wire during the winding and unwinding process.
Denson-Low Wanda K.
Hughes Aircraft Company
Sales Michael W.
Yee Deborah
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