B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/167, 22/56
B22D 11/04 (2006.01) B22D 11/124 (2006.01)
Patent
CA 1265310
MEANS AND TECHNIQUE FOR CASTING METALS AT A CONTROLLED DIRECT COOLING RATE Abstract Close control of the direct cooling rate is achieved by bubbling a substantially insoluble gas into the curtain-forming coolant as it is about to discharge onto the emerging ingot. The resulting bubble-entrained curtain of coolant experiences an increased velocity, and the increase is not accompanied by a reduction in the thermal conductivity of the coolant. Instead, the bubble-entrained coolant appears to have a scrubbing effect on the metal, which breaks up any film and reduces the tendency for film boiling to occur at the surface of the metal, thus allowing the process to operate at the more desirable level of nucleate boiling, if desired. This in turn makes it possible to regulate the cooling rate by selective use of the bubbling effect, including turning the effect on and off to allow film boiling to occur when desired such as in the butt forming stage of the casting operation. The bubbling effect can also be used to regu- late the cooling rate when the coolant is in short supply and/or hotter than desired.
543523
Smart & Biggar
Wagstaff Frank E.
Wagstaff Engineering Inc.
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