| 摘要 |
<p>1506462 Continuous casting LEICHTMETALL GmbH 20 May 1975 [20 May 1974] 21390/75 Heading B3F [Also in Division C3] After being cast between two belts of strip steel 7 or of mould parts joined in series-each belt bearing a protective layer of particulate material-a strip of metal, e.g. Al, Zn or an alloy thereof, is sprayed with water as from nozzles 9, in order to remove particles picked up from the layers on the belts. In the case of strip steel belts 7, which bear thicker layers, if the water pressure is insufficient to clean the cast strip, brushes 8 may be used also, and spray from further nozzles 12. The excess cooling may be compensated for by heating of the strip before it passes, by way of feed rolls to a rolling mill. A nozzle or several nozzles may be moved across the strip and back during casting. The nozzles may be offset from one another both in a direction transversely of and in the direction of strip movement. They may all be carried by a beam movable transversely of the strip. On each side of a cast strip up to 2000 mm. wide and 10-35 mm. thick, 200-1000 litres/ min. are sprayed at a pressure of 2-300 atm. The protective layers may be of carbon for lubrication and conduction and Kieselguhr bound with polyvinylpyrrolidone which decomposes with the heat so that particles transfer to the strip. The layers, in the case of the belts of mould parts, are sprayed on after regions (6) where the parts are cooled by water spray during return to the feed end of the machine.</p> |
