Program-controlled feeding of molten metal into the dies of...

B - Operations – Transporting – 22 – D

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22/167, 22/57

B22D 11/18 (2006.01) B22D 11/04 (2006.01) B22D 11/07 (2006.01) B22D 37/00 (2006.01)

Patent

CA 2038233

Abstract Upstream of the dies (14) internally insulated in the upper region is casting furnace and a runner system, which latter comprises a distributor trough feeding all the dies (14) with metal at an identical level (60). In the region situated below an inner ring (32), a gas cushion (54) which prevents direct contact of the die (14) with the molten metal (30) is maintained, and oil is injected into this region. A joint main having distribution lines conducts air or an inert gas having the same, slight overpressure into all the dies (14). The relative pressure between a desired value dependent on the metal level (H1) and computed by program and an actual value measured in the main (62) serves for regulation and monitoring. Upon overshooting of the programmed, maximum deviation of the controlled variable, a processor triggers a manipulated variable for the actuator of the pressure control valve. (Fig. 2)

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