B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/110, 22/167
B22D 11/00 (2006.01) B22D 11/049 (2006.01) B22D 11/124 (2006.01)
Patent
CA 1045781
ABSTRACT OF THE DISCLOSURE A casting method is disclosed which is particularly well- suited for the continuous casting of elongated metallic articles such as bars, bands and wires. The method involves admitting a quantity of molten metal into an upstream portion of a passage. This portion of the passage has a configuration which it is desired to obtain for the cast metal. The surface layers of the molten metal are solidi- fied by contact with the walls defining the upstream portion of the passage so that there is formed a metallic element having the config- uration of the upstream portion of the passage. The metallic ele- ment is advanced into a downstream portion of the passage where it is further cooled by direct contact with an air-water mixture which flows countercurrent to the direction of motion of the metallic ele- ment. Thereafter, the now fully solidified metallic element exits from the passage. The air-water mixture is formed near the exit of the passage by forcing water into the passage. This causes an under- pressure to develop in the passage as a result of which air is as- pirated into the passage thereby yielding an air-water mixture. The air-water mixture may, after direct cooling of the metallic element, be used for cooling the wall defining the upstream portion of the passage by conduction through this wall. The cooling of the metallic element in countercurrent flow permits a relatively slow cooling rate to be obtained whereby the danger of crack formation is reduced. A casting mold is also disclosed and includes a chamber for accom- modating water under pressure. The chamber communicates with a casting passage near the end of the latter so that the injection of water into the passage causes an underpressure to develop which, in turn, causes air to be drawn into the passage. In this manner, an air-water mixture may be formed which flows towards the upstream end of the passage.
222761
Moritz Gunther
Papayannakis Spyridon
LandOfFree
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