Means and technique for casting metals at a controlled direct co

Metal founding – Process – Shaping liquid metal against a forming surface

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164444, B22D 11124

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active

046932984

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 regulate the cooling rate when the coolant is in short supply and/or hotter than desired.

REFERENCES:
patent: 3713479 (1973-01-01), Bryson
patent: 4157728 (1979-06-01), Mitamura et al.
patent: 4166495 (1979-09-01), Yu
patent: 4597432 (1986-07-01), Collins et al.
patent: 4598763 (1986-07-01), Wagstaff et al.
Yu, Ho, "A Process to Reduce DC Ingot Butt Curl and Swell", Journal of Metals, Nov., 1980, pp. 23-27.

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