Abstract Described is a method of controlling an electro-magnetic molten metal pouring device which comprises an electro-magnetic pump which is adapted to generate a traveling magnetic field by a.c. excitation thereby to impart impellent force to molten metal present inside the pump, a molten metal reservoir located on one side of the pump, and a nozzle positioned on the other side of the pump; wherein supplying of molten metal to the molten metal reservoir is started and stopped respectively by detecting the lower limit level and the upper limit level of molten metal present in the molten metal reservoir, and pouring of the molten metal into a mold is started and stopped respectively by detecting the arrival of the mold and the molten metal fullness in the mold. In addition, disclosed is a method of controlling a molten metal pouring operation; wherein the final exciting voltage of said electro-magnetic pump in the preceding molten metal pouring operation is memorized, and the exciting voltage thereof is gradually raised up for a subsequent molten metal pouring operation, said memorized final exciting voltage in the preceding molten metal pouring operation being regarded as the initial exciting voltage for the subsequent molten metal pouring operation.
Inventors
👤 A Yamada
👤 H Shibutami
👤 K Hirano
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-02 10:20
CPC Classifications
B; B22; B22D; B22D39/00; B22D39/003
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
191 words
A method of controlling an electro-magnetic molten metal pouring device comprising the steps of detecting the lower limit level of molten metal in a molten metal reservoir of sufficient size to support a pouring operation of successive molds, supplying molten metal from a molten metal storing furnace to said reservoir when said lower limit level is detected, detecting the upper limit level of molten metal in said molten metal reservoir, terminating the supplying of molten metal from said molten metal storing furnace when said upper limit level is detected, exciting an electro-magnetic pump interposed between said molten metal reservoir and a pouring trough having a nozzle to move molten metal from said reservoir into said successive molds, controlling the exciting voltage to gradually raise the exciting voltage in continuous fashion during the pouring of each mold, setting the initial exciting voltage for each new mold pour of said operation equal to the final exciting voltage of the last preceding mold pour of said operation, and resetting the exciting voltage to its inital value for a subsequent pouring operation when said molten metal reservoir is subsequently again filled to its upper limit.
Claim 2
Independent Claim
191 words
A method of controlling an electro-magnetic molten metal pouring device comprising the steps of detecting the lower limit level of molten metal in a molten metal reservoir of sufficient size to support a pouring operation of successive molds, supplying molten metal from a molten metal storing furnace to said reservoir when said lower limit level is detected, detecting the upper limit level of molten metal in said molten metal reservoir, terminating the supplying of molten metal from said molten metal storing furnace when said upper limit level is detected, exciting an electro-magnetic pump interposed between said molten metal reservoir and a pouring trough having a nozzle to move molten metal from said reservoir into said successive molds, controlling the exciting voltage to gradually raise the exciting voltage in continuous fashion during the pouring of each mold, setting the initial exciting voltage for each new mold pour of said operation equal to the final exciting voltage of the last preceding mold pour of said operation, and resetting the exciting voltage to its inital value for a subsequent pouring operation when said molten metal reservoir is subsequently again filled to its upper limit.
Claim 3
Dependent Claim
47 words
A method according to claim 1, further comprising the step of exciting said electro-magnetic pump during the time between the pouring of successive molds at a voltage mErely sufficient to keep said molten metal warm, but not to cause said molten metal to flow from said nozzle.