Metal founding – Process – With measuring – testing – inspecting – or condition determination
Patent
1981-11-02
1985-01-29
Lin, Kuang Y.
Metal founding
Process
With measuring, testing, inspecting, or condition determination
164467, 164503, 164154, B22D 2702
Patent
active
044959818
ABSTRACT:
A multi-strand apparatus and process is provided for casting molten materials into ingots of desired shape. The apparatus comprises a plurality of devices for receiving and electromagnetically forming the molten material into desired shape. Each of the receiving and forming devices includes an inductor for applying a magnetic force field to the molten material. The inductor in operation is spaced from the molten material by a gap extending from the surface of the molten material to the opposing surface of the inductor. An alternating current applying device sends current to its associated inductor to generate the magnetic force field. Circuitry associated with each of the inductors senses variations in their respective gaps. The improvement comprises a pulse width modulating circuit associated with said gap variation sensing circuitry being connected to the alternating current applying device for controlling the application of alternating current to the inductor. A device is connected to the pulse width modulating circuit for synchronizing turn-on of all of the current applying devices whereby beat frequencies due to interaction between the plurality of inductors are substantially eliminated.
REFERENCES:
patent: 3467166 (1969-09-01), Getselev et al.
patent: 3702155 (1972-11-01), Getselev
patent: 4014379 (1977-03-01), Getselev
patent: 4034232 (1977-07-01), LaVenture
patent: 4161206 (1979-07-01), Yarwood et al.
patent: 4367522 (1983-01-01), Forstbauer et al.
Kindlmann Peter J.
Tyler Derek E.
Ungarean Gary L.
Yarwood John C.
Cohn Howard M.
Kelmachter Barry L.
Lin Kuang Y.
Olin Corporation
Weinstein Paul
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