B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/166, 22/49
B22D 27/02 (2006.01) B22D 11/01 (2006.01) B22D 11/20 (2006.01)
Patent
CA 1192372
ABSTRACT OF THE DISCLOSURE An apparatus and process for casting a material into a desired shape. The apparatus and process comprise the structure and steps for electromagnetically forming the material in molten form into the desired shape. An electromagnetic forming device applied an electromagnetic field to the molten material. This magnetic field defines a containment zone for the molten material. A sump of molten material is opera- tively associated with the forming structure for delivery of molten material to the forming structure. A device is provided for withdrawing the casting from the forming device at a desired withdrawal rate. Another device replenishes the sump of molten material at a replenishing rate as the casting is formed. The improvement comprises a control device for maintaining the hydrostatic pressure exerted by the molten material in the containment zone at a substantially constant desired level. The control device includes a first structure for providing a substantially constant material volume balance by maintaining the ratio of the withdrawal rate to the replenishing rate substantially constant when the hydrostatic pressure in the contain- ment zone varies less than a desired percentage from the desired level. A second device senses variations in the level of the hydrostatic pressure of the molten material in the containment zone. A third device is responsive to the second device for providing a material volume imbalance by varying the ratio of the control rate to the replenishing rate when the hydro- static pressure level of molten material varies more than said desired percentage from the desired level until the hydrostatic pressure of molten material in the containment zone returns to the desired level.
405832
Alan) Swabey & Co. Alan (swabey & Cie.
Olin Corporation
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