US3791437A - Method of controlling an electro-magnetic molten metal pouring device - Google Patents

Method of controlling an electro-magnetic molten metal pouring device Download PDF

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Publication number
US3791437A
US3791437A US00097752A US3791437DA US3791437A US 3791437 A US3791437 A US 3791437A US 00097752 A US00097752 A US 00097752A US 3791437D A US3791437D A US 3791437DA US 3791437 A US3791437 A US 3791437A
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United States
Prior art keywords
molten metal
pouring
electro
reservoir
mold
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Expired - Lifetime
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US00097752A
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English (en)
Inventor
A Yamada
H Shibutami
K Hirano
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Yaskawa Electric Corp
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Yaskawa Electric Manufacturing Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D39/00—Equipment for supplying molten metal in rations
    • B22D39/003—Equipment for supplying molten metal in rations using electromagnetic field

Definitions

  • 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.
  • tomatization and more particularly speed-up are essentially required in the field of the casting work.
  • it is very hard to control the molten metal pouring operation whereby the automatization still falls behind.
  • controlling of molten metal by means of the electro-magnetic pump is useful because it makes the automatic operation possible.
  • said controlling method is disadvantageous because the molten metal level is successively varied in the molten metal reservoir whereby the molten metal pouring rate becomes unstable.
  • a primary object of the present invention to provide a method of controlling an electromagnetic molten metal pouring device readily operable, wherein supplying of molten metal into a molten metal reservoir is roughlycontrolled by detecting the molten metal level of the molten metal reservoir and an electro-magnetic pump is controlled by detecting the position of a mold and the fullness of molten metal in the mold, on the mold side.
  • Another object of the present invention is to provide a method of controlling an electro-magnetic molten metal pouring device, wherein supplying of molten metal to a molten metal reservoir and pouring of molten metal into a mold are individually controlled and the whole control is simple.
  • Further object of the present invention is to provide a method of controlling an electro-magnetic molten metal pouring device, in which an electro-magnetic pump is employed which generates a substantially constant impellent force because the flow of molten metal is stable and smooth.
  • Still further object of the present invention is to provide a method of controlling an electro-magnetic molten metal pouring device, wherein molten metal is poured at a constant or required flow-rate by gradually .raising the exciting voltage of an electro-magnetic pump, with preferable relative control on successive stages.
  • FIG. 1 is a cross-sectional view of an electromagnetic molten metal pouring device employed in this invention
  • FIG. 2 is a plan view of a longitudinally sectioned electro-magnetic molten metal pouring device
  • FIG. 3 is a side view of an electro-magnetic pump being used in an embodiment of FIG. 1;
  • FIG. 4 illustrates the arrangement of devices employed for the present invention
  • FIG. 5 is a block diagramatic view illustrating a control method of an embodiment according to the present invention.
  • FIG. 6 exhibits a graphic diagram showing the change of the exciting voltage of an electro-magnetic pump employed for the embodiment shown in FIG. 5.
  • FIG. 4 there is described an arrangement of the device which comprises a metal melting furnace A, a trough B, a molten metal storing furnace C equipped with a means D for keeping warmth such as an induction coil, a molten metal pouring device E, a mold F, a level detector G, such as a float switch adapted to detect a molten metal level of a molten metal reservoir 1, a fullness detector H which is to detect the fullness of molten metal inthe mold, and a conveyer J conveying the mold successively.
  • a level detector G such as a float switch adapted to detect a molten metal level of a molten metal reservoir 1
  • a fullness detector H which is to detect the fullness of molten metal inthe mold
  • a conveyer J conveying the mold successively.
  • the molten metal pouring device comprises the molten metal reservoir 1 and a molten metal passage 2 located next to the reservoir 1.
  • the larger part of the molten metal passage 2 is substantially horizontal below the molten metal lower limit level of the molten metal reservoir 1.
  • An electromagnetic pump 3 is so arranged as to accomodate the molten metal passage 2 therein.
  • the electro-magnetic pump of a laminated iron core 31 is provided with a number of .slots 33 in which windings 32 of phases U, V, and W are inserted respectively, and a traveling magnetic field moving along the air-gap surface of the iron core is generated by ac.
  • a nozzle 4 is communicated with the molten metal passage 2, and is extended, starting from a position higher than the molten metal upper limit level H with a slightly rising gradient, and further hasa molten metal pouring outlet 5 at its end portion.
  • the impellent force directed from the molten metal reservoir 1 to the nozzle 4 is imparted to molten metal present in the molten metal passage 2 by the excitation of the electro-magnetic pump 3, whereby the molten metal climbs up into the nozzle 4 and then flows down into the mold F through the pouring outlet 5.
  • the fullness detector H starts to work thereby to remove the excitation of the electromagnetic pump 3 so that the molten metal present in the nozzle 4 immediately flows back into the molten metal passage 2: to stop pouring of the molten metal.
  • a signal is supplied to the conveyer so as to shift the mold.
  • Molten metal in the metal melting furnace A is transferred to the molten metal storing furnace C through the trough B.
  • the detector G operates to tilt the molten metal storing furnace thereby to supply the molten metal.
  • the detector G furnishes a signal so as to stop tilting of the molten metal storing furnace C thereby to stop supplying of the molten metal.
  • the impellent force generated by the electro-magnetic pump 3 is not influenced by the variation of the molten metal level.
  • the electro-magnetic pump 3 is excited, and when mold is fully filled with molten metal, the excitation of the electro-magnetic pump 3 is removed. If all the molds are equal, it is not required to adjust the excitation intensity. Thus, casting can be accomplished with accuracy at all times. If the molds are different from each other in size, the excitation may be adjusted.
  • a molten metal pouring device 6 comprises an electro-magnetic pump 7 located in the middle portion thereof, a molten metal reservoir 8 arranged on one side of the pump 7 and a molten metal pouring trough 9 located on the other side of the pump, both the molten metal reservoir 8 and the molten metal pouring trough 9 are communicated with each other.
  • the electro-magnetic pump flat iron cores are provided on both sides (or one side) of a pipe which is small in width and is made of heat-resisting material, the iron cores oppositely positioned are wound with polyphase a.c.
  • the molten'metal reservoir is so formed that its lowest level of molten metal is higher than the electro-magnetic pump 7 and its area is large so as to minimize the variation of the molten metal level which may be caused by pouring of the molten metal.
  • the molten metal pouring trough 9 is substantially the same in a cross-sectional area as the pipe of the electromagnetic pump 7 and has a gradient toward its end, and further is provided with a nozzle 10 at a position higher than the highest level of a molten metal of the molten metal reservoir 8.
  • the electro-magnetic pump 7 is filled with molten metal at all times and the molten metal in the pipe is expelled out of the nozzle 10 by excitation. It is accomplished by operating a regulator 11, a pilot motor 12 thereof, and a switch 13, to excite the electromagnetic pump, to remove the excitation thereof, and to adjust exciting voltages.
  • molten metal is supplied to the molten metal reservoir 8 from a metal melting furnace or an intermediary molten metal storing furnace (both not shown).
  • the switch 13 When it is detected that a predetermined mold is brought to a predetermined position, the switch 13 is turned on by a start signal of pouring thereby to excite the electro-magnetic pump 7. At the same time, molten metal is pushed out of the nozzle into the mold. However, the molten metal surface level is lowered in the moltal metal reservoir 8 as the pouring of molten metal is continued on, and therefore the regulator 11 is operated by driving the pilot motor 12, thereby to gradually raise an exciting voltage of the electro-magnetic pump 7 so that molten metal be poured at a substantially constant flow-rate. When the mold is filled up, the switch 13 is turned off to stop pouring of the molten metal, but the pilot motor is left as it is.
  • the start signal for pouring of the molten metal is furnished thereby to turn on the switch 13 and at the same time to rotate the pilot motor 12, whereby the exciting voltage of the electro-magnetic pump 7 is gradually raised up to pour the molten metal into the mold.
  • pouring of the molten metal is effected by controlling the exciting voltage to gradually raise the exciting voltage in continuous fashion during the pouring of each mold, and setting the initial exciting voltage for each new mold pour of the operation equal to the final exciting voltage of the last preceding mold pour of the operation. It can be easily accomplished by increasing a voltage raising rate, that is, a revolution speed of the pilot motor 12 to increase the flow-rate of molten metal in the molten metal pouring operation, and the flow-rate of molten metal also can be adjusted with ease.
  • the exciting voltage may be controlled by utilizing not only a regulator but also a static type means such as a thyristor, and by any other various methods.
  • the electro-magnetic pump may be excited at a low voltage for keeping warmth of the molten metal.
  • 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 electromagnetic pump interposed between said molten metal reservoirand 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 operasaid nozzle.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
US00097752A 1969-12-13 1970-12-14 Method of controlling an electro-magnetic molten metal pouring device Expired - Lifetime US3791437A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10032969 1969-12-13
JP1568670 1970-02-23

Publications (1)

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US3791437A true US3791437A (en) 1974-02-12

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US (1) US3791437A (de)
DE (1) DE2061168A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942577A (en) * 1973-07-18 1976-03-09 Toyota Jidosha Kogyo Kabushiki Kaisha Method and apparatus for controlling electromagnetic casting
US4299268A (en) * 1979-06-07 1981-11-10 Maschinenfabrik & Eisengiesserei Ed. Mezger Ag Automatically controlled casting plant
US5355937A (en) * 1991-09-27 1994-10-18 Wieland-Werke Ag Method and apparatus for the manufacture of a metal strip with near net shape

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2131121B2 (de) * 1971-06-23 1972-05-25 Aeg Elotherm Gmbh Elektromagnetische foerderrinne zum transport von fluessigen metallen
US3837531A (en) * 1972-02-14 1974-09-24 Modern Equipment Co Method for pouring liquid metal using electromagnetic pump

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3122800A (en) * 1961-05-01 1964-03-03 Gen Motors Corp Automatic metal pouring machine
US3441261A (en) * 1966-03-11 1969-04-29 Ajax Magnethermic Corp Constant level holding furnaces
US3515898A (en) * 1967-10-20 1970-06-02 Aeg Elotherm Gmbh Apparatus for pouring measured quantities of liquid metals from an electromagnetic conveyor channel
US3534886A (en) * 1967-09-07 1970-10-20 Aeg Elotherm Gmbh Method and apparatus for metering liquid metals to be conveyed electromagnetically from melting crucibles or heat-retaining vessels

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3122800A (en) * 1961-05-01 1964-03-03 Gen Motors Corp Automatic metal pouring machine
US3441261A (en) * 1966-03-11 1969-04-29 Ajax Magnethermic Corp Constant level holding furnaces
US3534886A (en) * 1967-09-07 1970-10-20 Aeg Elotherm Gmbh Method and apparatus for metering liquid metals to be conveyed electromagnetically from melting crucibles or heat-retaining vessels
US3515898A (en) * 1967-10-20 1970-06-02 Aeg Elotherm Gmbh Apparatus for pouring measured quantities of liquid metals from an electromagnetic conveyor channel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942577A (en) * 1973-07-18 1976-03-09 Toyota Jidosha Kogyo Kabushiki Kaisha Method and apparatus for controlling electromagnetic casting
US4299268A (en) * 1979-06-07 1981-11-10 Maschinenfabrik & Eisengiesserei Ed. Mezger Ag Automatically controlled casting plant
US5355937A (en) * 1991-09-27 1994-10-18 Wieland-Werke Ag Method and apparatus for the manufacture of a metal strip with near net shape

Also Published As

Publication number Publication date
DE2061168A1 (de) 1971-06-24

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