US3696858A - Method for casting metered quantities of liquid metals - Google Patents

Method for casting metered quantities of liquid metals Download PDF

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Publication number
US3696858A
US3696858A US821342A US3696858DA US3696858A US 3696858 A US3696858 A US 3696858A US 821342 A US821342 A US 821342A US 3696858D A US3696858D A US 3696858DA US 3696858 A US3696858 A US 3696858A
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United States
Prior art keywords
pouring
rate
liquid metal
maximum
casting
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Expired - Lifetime
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US821342A
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English (en)
Inventor
Gerhard Seulen
Axel Von Starck
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SMS Elotherm GmbH
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AEG Elotherm GmbH
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Publication date
Application filed by AEG Elotherm GmbH filed Critical AEG Elotherm GmbH
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Publication of US3696858A publication Critical patent/US3696858A/en
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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
    • B22D39/006—Electromagnetic conveyors

Definitions

  • Conveying devices in the form of travelling field runners more commonly called electromagnetic conveyor troughs have recently been proposed in which travelling electromagnetic fields generated by induction windings propel liquid metals up ascending paths contrary to the direction of gravity.
  • Such devices are used for instance for conveying liquid metals, for example for the discharge of vertical furnaces, or they may be used for pouring prescribed quantities of liquid metals into chill moulds, pressure diecasting machines, casting belts and the like.
  • For the latter use voltage is applied to the induction coil of a travelling field runner for the duration of the casting process. Hitherto it has been considered desirable that the rate of flow of metal in the runner is kept constant substantially independently of the liquid level in the furnace vessel.
  • travelling field runners have proved to be efficient metering devices. They help to mechanise and automate casting operations and relieve the foundryman of the recurrent task of apportioning an exactly predetermined quantity of liquid metal.
  • the present invention provides a method of casting metered quantities of liquid metals with the aid of a travelling field runner, and consists in starting the metered casting operation at a low pouring rate of the metal, then increasing the pouring rate to a maximum and thereafter continuously reducing the pouring rate until the entire predetermined quantity of liquid metal has been cast.
  • a three-phase generator 1 delivers a voltage through a three-phase switch 2 to the primaries 3 of a transformer 4.
  • the primary voltage of the transformer 4 induces corresponding voltages in the transformer secondaries 5 each of which is provided with a tap 6 connected to a tap 7 on the three-phase inductor winding 14 of an electromagnetic travelling field runner.
  • the tap 7 determines the point along the travelling field runner up to which the metal melt is continuously conveyed up the runner when the switch 2 is closed.
  • From the ends 9 of the secondaries of the transformer 4 conductors 10 lead to variable reactance coils 11 and thence to a switch 12 directly associated with a controller 13 which adjusts the variable reactance coils according to a predetermined programme.
  • the generator 1 applies voltage through the transformer 4 and the tap 7 to the inductor winding 14 which continuously feeds the metal forwards.
  • the winding 15 of the inductor which is intended to control the pouring operation receives voltage from the ends 9 of the secondaries of the transformer 4 through the variable reactances 11.
  • the controller 13 begins to function and to adjust the reactance coils 11 according to a predetermined programme during the time the switch 12 is closed.
  • Variation of the reactances of the reactance coils 11 causes the inductor winding to receive a varying voltage in such manner that at the beginning of the pouring operation the rate of supply of the liquid metal is low, then rises to a maximum from which it again decreases continuously to the end of the pouring operation.
  • variable reactance coils l1 variable impedances, capacitors, controllable transformers or other equivalent devices may likewise be used.
  • a method of casting metered quantities of a liquid metal from a travelling field electromagnetic conveyor trough comprising the steps of controlling the initial pouring rate of liquid metal to the casting mould at a relatively low pouring rate, subsequently increasing the rate to a maximum, and thereafter continuously reducing the pouring rate from said maximum pouring rate until a predetermined quantity of liquid metal has been poured, said pouring rates being controlled by varying the effective intensity of the travelling field.
  • steps of controlling, increasing and reducing each include the step of variably controlling the voltage supplied from a source to said travelling field electromagnetic conveyor trough.
  • step of voltage controlling includes the step of varying the reactance of at least a single variable reactance coil connecting said source to said electromagnetic conveyor trough according to a predetermined program.
  • step of varying includes the steps of varying together the reactances of three variable reactance coils connecting a three phase source to said electromagnetic conveyor trough via a transformer.
  • a method of casting metered quantities of a liquid metal from a travelling field electromagnetic conveyor trough comprising controlling the pouring rate of liquid metal during the casting operation whereby a maximum pouring rate is provided, and thereafter continuously reducing the pouring rate from said maximum pouring rate until a predetermined quantity of liquid metal has been poured, said pouring rates being controlled by varying the effective intensity of the travelling field.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Continuous Casting (AREA)
US821342A 1968-09-24 1969-05-02 Method for casting metered quantities of liquid metals Expired - Lifetime US3696858A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681783044 DE1783044B1 (de) 1968-09-24 1968-09-24 Einrichtung zum dosieren von fluessigen metallen aus schmelz oder warmhaltegefaessen mit einer / lektromagneti schen foerderrinne

Publications (1)

Publication Number Publication Date
US3696858A true US3696858A (en) 1972-10-10

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ID=5705269

Family Applications (1)

Application Number Title Priority Date Filing Date
US821342A Expired - Lifetime US3696858A (en) 1968-09-24 1969-05-02 Method for casting metered quantities of liquid metals

Country Status (4)

Country Link
US (1) US3696858A (enrdf_load_stackoverflow)
DE (1) DE1783044B1 (enrdf_load_stackoverflow)
FR (1) FR2018706A1 (enrdf_load_stackoverflow)
GB (1) GB1252954A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765797A (en) * 1971-04-10 1973-10-16 Aeg Elotherm Gmbh Improved electromagnetic conveyor trough
US3807484A (en) * 1972-03-17 1974-04-30 Aeg Elotherm Gmbh Method and apparatus for casting liquid metals
US4398589A (en) * 1981-09-25 1983-08-16 General Electric Company Pumping and metering device for fluid metals using electromagnetic pump
WO1987004378A1 (en) * 1986-01-16 1987-07-30 Nuclear Metals Inc System for reforming levitated molten metal into metallic forms
US6953093B2 (en) 2001-04-19 2005-10-11 Halliburton Energy Services, Inc. Communication tool for accessing a non annular hydraulic chamber of a subsurface safety valve
CN103658620A (zh) * 2013-11-29 2014-03-26 安徽省宁国市宁沪钢球有限公司 一种流量控制型钢球成型模具自动进料系统及其控制方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2702004A (en) * 1951-07-25 1955-02-15 British Thomson Houston Co Ltd Linear polyphase electromagnetic pump
US2753605A (en) * 1952-11-29 1956-07-10 Republic Steel Corp Apparatus for metering of molten metal by weight
US2970830A (en) * 1957-03-21 1961-02-07 Soudure Electr Autogene Varying the falling speed of a stream of molten metal
US3005116A (en) * 1957-06-04 1961-10-17 English Electric Co Ltd Discontinuous induction type dynamoelectric machines
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

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1028297B (de) * 1952-06-16 1958-04-17 Asea Ab Vorrichtung zum Regeln der Stroemungsgeschwindigkeit von fluessigem Metall
DE1880024U (de) * 1963-04-04 1963-10-03 Bbc Brown Boveri & Cie Giessbehaelter zum vergiessen schmelzfluessiger metalle.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2702004A (en) * 1951-07-25 1955-02-15 British Thomson Houston Co Ltd Linear polyphase electromagnetic pump
US2753605A (en) * 1952-11-29 1956-07-10 Republic Steel Corp Apparatus for metering of molten metal by weight
US2970830A (en) * 1957-03-21 1961-02-07 Soudure Electr Autogene Varying the falling speed of a stream of molten metal
US3005116A (en) * 1957-06-04 1961-10-17 English Electric Co Ltd Discontinuous induction type dynamoelectric machines
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

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765797A (en) * 1971-04-10 1973-10-16 Aeg Elotherm Gmbh Improved electromagnetic conveyor trough
US3807484A (en) * 1972-03-17 1974-04-30 Aeg Elotherm Gmbh Method and apparatus for casting liquid metals
US4398589A (en) * 1981-09-25 1983-08-16 General Electric Company Pumping and metering device for fluid metals using electromagnetic pump
WO1987004378A1 (en) * 1986-01-16 1987-07-30 Nuclear Metals Inc System for reforming levitated molten metal into metallic forms
US4735252A (en) * 1986-01-16 1988-04-05 Nuclear Metals, Inc. System for reforming levitated molten metal into metallic forms
US6953093B2 (en) 2001-04-19 2005-10-11 Halliburton Energy Services, Inc. Communication tool for accessing a non annular hydraulic chamber of a subsurface safety valve
CN103658620A (zh) * 2013-11-29 2014-03-26 安徽省宁国市宁沪钢球有限公司 一种流量控制型钢球成型模具自动进料系统及其控制方法
CN103658620B (zh) * 2013-11-29 2016-02-10 安徽省宁国市宁沪钢球有限公司 一种流量控制型钢球成型模具自动进料系统及其控制方法

Also Published As

Publication number Publication date
GB1252954A (enrdf_load_stackoverflow) 1971-11-10
DE1783044B1 (de) 1971-05-13
FR2018706A1 (enrdf_load_stackoverflow) 1970-06-26

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