US3669176A - Drive system for continuous casting plants - Google Patents

Drive system for continuous casting plants Download PDF

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Publication number
US3669176A
US3669176A US858982A US3669176DA US3669176A US 3669176 A US3669176 A US 3669176A US 858982 A US858982 A US 858982A US 3669176D A US3669176D A US 3669176DA US 3669176 A US3669176 A US 3669176A
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United States
Prior art keywords
mold
stepping motor
strand
electrohydraulic
pulses
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Expired - Lifetime
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US858982A
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English (en)
Inventor
Heribert Krall
Helmut Maag
Otto Herrmann
Rudolf Posl
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Siemens AG
Siemens Corp
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Siemens Corp
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Publication date
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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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1284—Horizontal removing

Definitions

  • Our invention relates to continuous casting plants and more particularly to a drive system for drawing a continuous strandshaped casting out of the mold or molten mass of the casting plant with the aid of driven nip rollers which engage the casting at a locality where the casing is solidified and rigid.
  • Another object of the invention is to provide strand casting plants with a combination of an electrical and hydraulic drive that affords a rapid strand drawing or pulling travel as well as an accurately controllable speed, distance or stopping point of such travel.
  • an electrohydraulic stepping motor which receives electrical control pulses from a programmable control or monitor device.
  • An electrohydraulic stepping motor in which the electrical stepper and the hydraulic motor proper are combined in a structural unit is known as such, for example, from the periodical Control Engineering January, 1962, pages 73 to 75.
  • the input control signals are pulses of very low electrical voltage or current magnitudes; but the output torque is comparatively large by virtue of the hydraulic components. This is due to the fact that the electrohydraulic stepping motor has inherently a high amplifying gain by virtue of an internal feedback and constitutes a type of servomechanism or digital-analog converter.
  • the electrical stepping motor (stepper) of such an electrohydraulic unit is a small motor which is switched step-bystep in response to respective electrical pulses. Its angle of rotation is proportional to the number of the input pulses, and its speed of rotation is proportional to the pulse frequency. Details of such an electric stepping motor are described, for example, in US. Pat. No. 3,293,060.
  • the electric stepping motor drives a control valve constituted by a slider and a surrounding sleeve with respective hydraulic ducts. The supply of pressure medium to the hydraulic motor of the unit is controlled in proportion to the relative displacement between sleeve and slider of the valve. Details of this type of control valve are described in US. Pat. Nos. 3,310,284 and 3,079,899.
  • the shaft of the hydraulic motor is coupled with the sleeve of the control valve whose slider is axially displaced by the electrical stepping motor.
  • This provides the abovementioned internal feedback and has the effect that the hydraulic motor follows at high accuracy the movements performed by the electrical stepping motor.
  • the electrical pulses for the stepping motor are furnished from a control device for the type described, for example, in French Pat. Nos. 1,399,100 and 1,379,984.
  • the shaft of the hydraulic motor follows exactly the rotary movements of the electrical stepping motor and hence precisely the commands embodied in the sequence of control pulses.
  • This drive system has inherently a very slight time constant since the electrical portion operates at'relatively slight power and for that reason is well suitable for a rapid stroke sequence and thus also foe short abrupt movements in the forward or reverse direction. Since the drive virtually does not over-shoot or coast but stops immediately when the control pulses cease, the length of the waiting intervals during which the strand casting is no longer moved by the drive rollers is accurately adjustable.
  • the drive system according to the invention has the further advantage that the contraction of the strand during stand still can be easily equalized, namely by controlling the electrohydraulic stepping motor, first by a number of control pulses for forward operation, and thereafter by a smaller number of pulses for reverse rotation.
  • the power required for drawingthe: strand out of the molten mass may be temporarily very high. During such intervals of increased demand the pulling force exerted upon the strand should be as high as feasible.
  • the abovedescribed roller drive is preferably so designed that the nipping pressure of the rollers is made dependent upon the changes in torque occurring at the rollers to afford the assurance that the entire torque developed by the electrohydraulic stepping motor is transferred onto the strand driving rollers.
  • the driving force furnished from the electrohydraulic motor to the rollers may also be automatically adapted to any changes in power requirements by providing a controllable transmission between the rollers and the hydraulic motor controlling the transmission in dependence upon changes in torque.
  • the mold or quantity of molten metal from which the strandshaped casting is being drawn remains stationary and that only the driving rollers move intermittently.
  • the invention is not limited to this type of strand casting plant but is equally well applicable to plants in which the mold or melt container as well as the drive rollers must be driven.
  • One way of applying the invention to such a plant is to provide two electrohydraulic stepping motors for the mold, on the one hand, and for the drive rollers, on the other hand.
  • the two electrohydraulic motors are controlled from a single control monitor device which furnishes the programmed sequences of signals to the electrical portions of both electrohydraulic motors.
  • the two drives are properly synchronized.
  • a frequency divider may be interposed between the common monitor device and one or both stepping motors.
  • FIG. 1 shows schematically a strand casting plant with a drive system according to the invention by way of example
  • FIG. 2 is a travel-time diagram explanatory of the method embodied in the system operation
  • FIG. 3 is a schematic diagram of logic circuits embodied in the drive system of FIG. 1 for performing the operation represented in FIG. 2;
  • FIG. 4 is a block diagram of a modified drive system
  • FIG. 5 is a block diagram of still another modification.
  • the metal strand 2 is drawn incrementally out of the mold or melt container 1 of the furnace by means of drive rollers 3.
  • the rollers 3, or at least one of them, are driven by an electrohydraulic stepping motor 5.
  • an electrohydraulic stepping motor 5 comprises an electrical stepping motor which responds to signal pulses, and a hydraulic motor which, by virtue of internal feedback, performs a follow-up travel as prescribed by the electric stepping motor.
  • An electronic controller or monitor 4 supplies the electrical signal pulses to the electrohydraulic motor 5 in accordance with the desired technological requirements as represented, for example, in the form of punch cards, by a predetermined program.
  • the diagram in FIG. 2 represents the operating method of the strand casting plant, the travel distance of the strand casting being indicated along the abscissa.
  • the ordinate indicates time.
  • a pulling interval a therefollows a waiting interval b.
  • a relaxation interval 0 is provided and is followed by another waiting interval d. Thereafter the same cycle a to d is repeated.
  • the length of the individual intervals can be choosen at will.
  • the monitor device 4 is designed as shown in FIG. 3.
  • the signal pulses for controlling the electrohydraulic stepping motor to run in the forward or reverse direction are issued by a pulse transmitter 4a.
  • the direction of the motor rotation depends upon which one of two AND gates 4bl and 4b2 is open during an interval of time determined by a timer 40 or 4d, each timer consisting, for example, of a monostable flip-flop.
  • the running direction is under controlled by a bistable flip-flop 4f which receives setting and resetting pulses through logic circuitry 4i from an electronic counter 4g which counts the pulses received from an input reader 4h during the length of the timing signal received from the timer 40 or 4a through another AND gate 4e.
  • the reader 4h responds to a program embodied in a punched card or strip as schematically indicated.
  • the timer 4d passes pulses through the AND gate 4e to the counter 4g preadjusted by the reader 4h.
  • the pulses simultaneously pass through the AND gate 4b1 to the pulse transmitter 4a which generates and issues the electrical pulse sequences for the electrohydraulic stepping motor 5.
  • a command signal issues from the counter 4g through the stage 41' to the bistable flip-flop 4f so that the outgoing signal switches from the output a to the output c.
  • the timing stage 4d is actuated and during the waiting interval b (FIG.
  • a transmission 7 and a torque converter 8 are interposed between the drive rollers 3 and the electrohydraulic stepping motor 5.
  • the torque converter 8 may be of electrical or mechanical type and also serves to measure the torque.
  • a feed back connection shown schematically at 9 switches the transmission 7 to a different transmission ratio.
  • the valve 10 is actuated in dependence upon the torque measured in converter 8 and controls a hydraulic medium which correspondingly varies the pressure exerted between the drive rollers and the strand casting.
  • two electrohydraulic stepping motors 5 are provided for driving the rollers 3 on the one hand, and for shifting the mold or melt container of the casting plant on the other hand.
  • a single electronic controller 4 monitors both stepping motors and supplies the individual motors 5 with pulses through respective frequency dividers 6 any desired speed or travel ratio between the two motors can be adjusted in a simple manner by correspondingly setting the two frequency dividers.
  • the electrohydraulic stepping motor may also be electrically controlled by manual operation; and it is also possible to provide for automation to a still further extent, namely in such a manner that the control device 4 is monitored directly from a computer which determines the required signals or signal sequences from operational data of the plant, such as temperature, pressure, stored quantity of molten metal, etc.
  • additional electronic circuitry may be provided for issuing a warning signal when the level of molten metal in the furnace becomes too low so that replenishment is needed.
  • Electronic means may also be used for indicating the actual metal temperature in the furnace, for regulating the flame or other source of heat which keeps the molten metal sufficiently hot, or for regulating the temperature of the coolant for the metal mold or pool from which the strand casting is being drawn. The temperature of the strand itself may also be measured and indicated by electronic means.
  • a drive system for drawing a continuous strand casting out of the mold of a continuous casting plant comprising drive roller means engageable with the strand casting leaving the mold, a first electrohydraulic stepping motor in mechanical driving connection with said roller means for driving them in response to electrical signal pulses, a second electrohydraulic stepping motor for displacing the mold, and a pulse transmitting monitor electrically connected to said first and second stepping motors for programmed conjoint control of said first and second stepping motors by the same sequences of electrical pulses, said monitor comprising means for generating and supplying said electrohydraulic stepping motors with alternating and mutually time-spaced sequences of electrical signal pulses so as to draw the strand casting in incremental lengths of travel out of the mold and inserting an interval of rest between successive travel periods.
  • a drive system comprising pulsefrequency dividers interposed between said monitor and said two electrohydraulic motors for maintaining a desired ratio of travel between said two motors.
  • a drive system for drawing a continuous strand casting out of the mold of a continuous casting plant comprising drive roller means engageable with the strand casting leaving the mold, an electrohydraulic stepping motor in mechanical driving connection with said roller means for driving them in response to electrical signal pulses, and a pulse transmitting monitor electrically connected to said stepping motor for programmed control of said stepping motor, said monitor comprising means for generating and supplying said electrohydraulic stepping motor with alternating and mutually time-spaced sequences of electrical signal pulses and means for changing each second one of two pulse sequences to motor operation in the reverse direction and means for reducing the number of pulses in the second sequence relative to the number of pulses in the first sequence.
  • the method of drawing a continuous strand casting out of the mold of a continuous casting plant with the aid of drive rollers engaging the strand and an electrohydraulic stepping motor mechanically driving the rollers comprises electrically controlling the electrohydraulic stepping motor by discrete and mutually time-spaced sequences of electrical pulses so as to draw the strand casting in incremental lengths of travel out of the mold and inserting an interval of rest between successive travel periods, including supplying to the electrohydraulic motor a number of sequential electrical pulses for forward rotation and thereafter a smaller number of pulses for reverse rotation so as to compensate for contraction of the strand.
  • the method of drawing a continuous strand casting out of the mold of a continuous casting plant with the aid of drive rollers engaging the strand and an electrohydraulic stepping motor mechanically driving the rollers comprises electrically controlling the electrohydraulic stepping motor by discrete and mutually timespaced sequences of electric pulses so as to draw the strand casting in incremental lengths of travel out of the mold and inserting an interval of rest between successive travel periods, separately displacing the mold by means of another electrohydraulic stepping motor, conjointly controlling the two motors by the same sequences of electrical pulses and applying pulse-frequency division for maintaining a given ratio of travel between the two 5 motors.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Stepping Motors (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
US858982A 1968-09-21 1969-09-18 Drive system for continuous casting plants Expired - Lifetime US3669176A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1783032A DE1783032C3 (de) 1968-09-21 1968-09-21 Einrichtung zum Steuern des schrittweisen Ausziehens eines Stranges aus einer horizontalen Stranggießkokille

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US3669176A true US3669176A (en) 1972-06-13

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US858982A Expired - Lifetime US3669176A (en) 1968-09-21 1969-09-18 Drive system for continuous casting plants

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US (1) US3669176A (de)
AT (1) AT295767B (de)
CH (1) CH507039A (de)
DE (1) DE1783032C3 (de)
FR (1) FR2018597B1 (de)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3726333A (en) * 1971-07-07 1973-04-10 Gen Motors Corp Control of continuous casting operation
US3817313A (en) * 1971-01-19 1974-06-18 Davy Ashmore Ltd A method of continuously casting metal
US3907023A (en) * 1973-07-23 1975-09-23 Stoody Co Process for starting an operation to continuously cast metal rod
US3908747A (en) * 1973-07-23 1975-09-30 Stoody Co Control system for continuous-casting drive unit
US4073333A (en) * 1974-12-23 1978-02-14 Korshunov Evgeny Method of continuous casting of ingots
US4211270A (en) * 1978-07-28 1980-07-08 Kennecott Copper Corporation Method for continuous casting of metallic strands at exceptionally high speeds
US4307770A (en) * 1978-07-28 1981-12-29 Kennecott Corporation Mold assembly and method for continuous casting of metallic strands at exceptionally high speeds
EP0052598A1 (de) * 1980-11-18 1982-05-26 Böhler Aktiengesellschaft Vorrichtung zum horizontalen Stranggiessen
US4437509A (en) 1980-10-01 1984-03-20 Boehler Aktiengesellschaft Method for control of billet stripping
US4450894A (en) * 1979-07-10 1984-05-29 Nippon Kokan Kabushiki Kaisha Method for horizontal type continuous casting
US4513806A (en) * 1983-05-23 1985-04-30 Kabushiki Kaisha Kobe Seiko Sho Apparatus for withdrawing solidified rod in horizontal type continuous casting machines
US4590985A (en) * 1983-10-31 1986-05-27 Nippon Kokan Kabushiki Kaisha Apparatus for horizontally and intermittently withdrawing cast steel strand from horizontal mold of horizontal type continuous casting machine
US4612971A (en) * 1978-07-28 1986-09-23 Kennecott Corporation Method and apparatus for the continuous production of strip using oscillating mold assembly
US4633934A (en) * 1984-07-16 1987-01-06 Mannesmann Aktiengesellschaft Horizontal continuous casting method
US4651803A (en) * 1984-09-05 1987-03-24 Nippon Kokan Kabushiki Kaisha Billet control method in a horizontal continuous casting system
US4714106A (en) * 1984-07-16 1987-12-22 Mannesmann Ag Method of horizontal continuous casting
US4735253A (en) * 1985-07-16 1988-04-05 Concast Service Union Ag Method of and apparatus for conveying a continuously cast strand
US4736789A (en) * 1978-07-28 1988-04-12 Kennecott Corporation Apparatus and method for continuous casting of metallic strands at exceptionally high speeds using an oscillating mold assembly
US5267604A (en) * 1989-11-03 1993-12-07 Steel Casting Engineering, Ltd. Motion control system for horizontal continuous caster

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3117407C2 (de) * 1981-05-02 1984-12-13 Technica-Guss GmbH, 8700 Würzburg Verfahren und Vorrichtung zum Ausziehen des Stranges bei einer Horizontal-Stranggießanlage
US4763719A (en) * 1984-02-07 1988-08-16 Voest-Alpine International Corporation Apparatus for discontinuous withdrawing of a cast strand
DE3528328A1 (de) * 1985-08-07 1987-02-19 Mannesmann Ag Verfahren und auszieheinrichtung zum horizontalstranggiessen von metall, insbesondere von stahl
AT383066B (de) * 1985-09-05 1987-05-11 Voest Alpine Ag Verfahren zum diskontinuierlichen ausziehen eines stranges sowie vorrichtung zur durchfuehrung des verfahrens
DE3622838C2 (de) * 1985-09-05 1994-09-08 Voest Alpine Ind Anlagen Vorrichtung zum diskontinuierlichen Ausziehen eines Gußstranges
DE19831111A1 (de) † 1998-07-11 2000-01-13 Km Europa Metal Ag Verfahren zur Erzeugung eines zu einem Coil wickelbaren Metallbands und Horizontal-Bandgießanlage zur Durchführung des Verfahrens
RU2364467C1 (ru) * 2008-03-13 2009-08-20 Открытое акционерное общество Акционерная холдинговая компания "Всероссийский научно-исследовательский и проектно-конструкторский институт металлургического машиностроения имени академика Целикова" (ОАО АХК "ВНИИМЕТМАШ") Устройство управления механизмом вытягивания заготовки машины непрерывного литья заготовок горизонтального типа

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1088171A (en) * 1913-01-30 1914-02-24 Adam Helmer Pehrson Manufacture of bar and tube shaped articles from molten metal.
US2135183A (en) * 1933-10-19 1938-11-01 Junghans Siegfried Process for continuous casting of metal rods
US2815551A (en) * 1955-06-21 1957-12-10 British Iron Steel Research Method of and apparatus for the casting of metal
US3290734A (en) * 1963-05-25 1966-12-13 Alfred J Wertli Apparatus for horizontal, continuous metal casting
US3417810A (en) * 1965-09-01 1968-12-24 United States Steel Corp System for progressive shutdown of cooling water sprays
US3438426A (en) * 1966-02-15 1969-04-15 Campbell Gifford & Morton Ltd Ingot withdrawal means for continuous casting
US3478808A (en) * 1964-10-08 1969-11-18 Bunker Ramo Method of continuously casting steel
US3504732A (en) * 1966-09-03 1970-04-07 Alfred J Wertli Apparatus for continuously casting metals

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1467373A (fr) * 1966-02-04 1967-01-27 Nouveau procédé de coulée continue de métaux

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1088171A (en) * 1913-01-30 1914-02-24 Adam Helmer Pehrson Manufacture of bar and tube shaped articles from molten metal.
US2135183A (en) * 1933-10-19 1938-11-01 Junghans Siegfried Process for continuous casting of metal rods
US2815551A (en) * 1955-06-21 1957-12-10 British Iron Steel Research Method of and apparatus for the casting of metal
US3290734A (en) * 1963-05-25 1966-12-13 Alfred J Wertli Apparatus for horizontal, continuous metal casting
US3478808A (en) * 1964-10-08 1969-11-18 Bunker Ramo Method of continuously casting steel
US3417810A (en) * 1965-09-01 1968-12-24 United States Steel Corp System for progressive shutdown of cooling water sprays
US3438426A (en) * 1966-02-15 1969-04-15 Campbell Gifford & Morton Ltd Ingot withdrawal means for continuous casting
US3504732A (en) * 1966-09-03 1970-04-07 Alfred J Wertli Apparatus for continuously casting metals

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Control Engineering, Vol. 9, No. 1, January 1964. TJ212.C6. pp. 73 75. *

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3817313A (en) * 1971-01-19 1974-06-18 Davy Ashmore Ltd A method of continuously casting metal
US3726333A (en) * 1971-07-07 1973-04-10 Gen Motors Corp Control of continuous casting operation
US3907023A (en) * 1973-07-23 1975-09-23 Stoody Co Process for starting an operation to continuously cast metal rod
US3908747A (en) * 1973-07-23 1975-09-30 Stoody Co Control system for continuous-casting drive unit
US4073333A (en) * 1974-12-23 1978-02-14 Korshunov Evgeny Method of continuous casting of ingots
US4612971A (en) * 1978-07-28 1986-09-23 Kennecott Corporation Method and apparatus for the continuous production of strip using oscillating mold assembly
US4307770A (en) * 1978-07-28 1981-12-29 Kennecott Corporation Mold assembly and method for continuous casting of metallic strands at exceptionally high speeds
US4736789A (en) * 1978-07-28 1988-04-12 Kennecott Corporation Apparatus and method for continuous casting of metallic strands at exceptionally high speeds using an oscillating mold assembly
US4211270A (en) * 1978-07-28 1980-07-08 Kennecott Copper Corporation Method for continuous casting of metallic strands at exceptionally high speeds
US4450894A (en) * 1979-07-10 1984-05-29 Nippon Kokan Kabushiki Kaisha Method for horizontal type continuous casting
US4437509A (en) 1980-10-01 1984-03-20 Boehler Aktiengesellschaft Method for control of billet stripping
EP0052598A1 (de) * 1980-11-18 1982-05-26 Böhler Aktiengesellschaft Vorrichtung zum horizontalen Stranggiessen
US4513806A (en) * 1983-05-23 1985-04-30 Kabushiki Kaisha Kobe Seiko Sho Apparatus for withdrawing solidified rod in horizontal type continuous casting machines
US4590985A (en) * 1983-10-31 1986-05-27 Nippon Kokan Kabushiki Kaisha Apparatus for horizontally and intermittently withdrawing cast steel strand from horizontal mold of horizontal type continuous casting machine
US4633934A (en) * 1984-07-16 1987-01-06 Mannesmann Aktiengesellschaft Horizontal continuous casting method
US4714106A (en) * 1984-07-16 1987-12-22 Mannesmann Ag Method of horizontal continuous casting
US4651803A (en) * 1984-09-05 1987-03-24 Nippon Kokan Kabushiki Kaisha Billet control method in a horizontal continuous casting system
US4735253A (en) * 1985-07-16 1988-04-05 Concast Service Union Ag Method of and apparatus for conveying a continuously cast strand
US5267604A (en) * 1989-11-03 1993-12-07 Steel Casting Engineering, Ltd. Motion control system for horizontal continuous caster

Also Published As

Publication number Publication date
DE1783032A1 (de) 1971-03-04
CH507039A (de) 1971-05-15
AT295767B (de) 1972-01-25
FR2018597B1 (de) 1974-02-22
DE1783032C3 (de) 1974-01-03
DE1783032B2 (de) 1973-06-07
FR2018597A1 (de) 1970-05-29

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