EP0052598A1 - Dispositif de coulée continue horizontale - Google Patents

Dispositif de coulée continue horizontale Download PDF

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Publication number
EP0052598A1
EP0052598A1 EP81890169A EP81890169A EP0052598A1 EP 0052598 A1 EP0052598 A1 EP 0052598A1 EP 81890169 A EP81890169 A EP 81890169A EP 81890169 A EP81890169 A EP 81890169A EP 0052598 A1 EP0052598 A1 EP 0052598A1
Authority
EP
European Patent Office
Prior art keywords
motor
strand
rom
microprocessor
mold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP81890169A
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German (de)
English (en)
Other versions
EP0052598B1 (fr
Inventor
Max Ahrens
Manfred Dipl.-Ing. Haissig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Boehler AG
Original Assignee
Boehler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=3578144&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0052598(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Boehler AG filed Critical Boehler AG
Publication of EP0052598A1 publication Critical patent/EP0052598A1/fr
Application granted granted Critical
Publication of EP0052598B1 publication Critical patent/EP0052598B1/fr
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Classifications

    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock

Definitions

  • the invention relates to a device for horizontal continuous casting with a fixed sliding mold, one or more pairs of gripper rollers driven by a DC motor, for gradually pulling the strand out of the mold.
  • the strand that has not yet fully solidified is drawn off from a stationary or oscillating mold.
  • the strand withdrawal takes place discontinuously, i.e. step by step, depending on the method, a pause is made between the individual steps or the strand is pushed back a little, whereby the pushing back should take into account the thermal expansion on the one hand and on the other hand should bring about a firm welding of the individual strand skin sections formed in the mold.
  • the first arrangement consists of jaws which engage the strand and move it a little, the fixation of the jaws on the strand being released and these returning to the starting position and engaging the strand again, whereupon the movement process is repeated.
  • This type of drive is inexact, because on the one hand large masses, etc. the jaws have to be moved, so that appropriately dimensioned gears are used which have a relatively large clearance, and there is also the difficulty that the jaws do not always grasp the strand at exactly the same point, so that further inaccuracy occurs when the strand is pulled off.
  • a more precise control of the strand take-off can be achieved if gripper rollers directly engage the strand, since with this strand take-off there is constant contact between the strand and gripper rollers, which is a prerequisite for the exact strand take-off.
  • a device for batchwise conveying of a metallic casting strand wherein a pair of conveyor rollers, which is driven by a gear, alternately acts on the strand and additionally executes a reciprocating movement along the strand axis.
  • a clamping device for the strand is additionally provided. This device is of relatively complicated design and does not allow a completely exact movement sequence, so that the disadvantages already mentioned occur.
  • a device for the step-by-step pulling of a strand from a horizontal continuous casting mold in which the pair of gripper rollers is driven by a step-by-step DC motor via a gear.
  • the motor To control the motor, on the one hand its speed is determined analogously and the angle of rotation of the gripping rollers is determined digitally.
  • the movement of the gripper rollers cannot be directly deduced from the speed of rotation of the motor, since that Power transmission system between the motor and gripping rollers has a game. With the digital determination of the gripper roller movement, the movement of the strand can be determined, which in turn serves to regulate the rotational speed of the motor.
  • this device that a pause is maintained when a predetermined torque is exceeded, as a result of which detachment of the strand skin ring that is being formed from the mold is to be waited for.
  • This device is thus of complex design and therefore extremely susceptible to malfunction, so that in many cases the required operational reliability is not provided.
  • a device for horizontal continuous casting with a fixed sliding mold and a pair of gripping rollers driven by a DC motor for step-by-step pulling of the strand out of the mold is known, the DC motor being connected to a control unit and this in a program-dependent setting time and Sequence emits pulse trains, which are fed to the DC motor.
  • the actual power transmission is not carried out by the DC motor, but by an electrohydraulic stepper motor.
  • An electrohydraulic stepper motor is to be understood as a combination of a stepper motor and a hydraulic motor, the electric stepper motor driving a control valve which controls the pressure medium supply to the hydraulic motor, whereby regulation of the speed of the hydraulic motor can be achieved.
  • the aim of the invention is to avoid these disadvantages and to propose a device of the type mentioned at the outset which is distinguished by a particularly simple structure and ensures an exact deduction.
  • this is achieved in that at least one gripping roller is arranged on the axis of the motor or is coupled directly to it.
  • This not only results in a very simple structure, but there is also a direct connection between the angle of rotation of the motor and the path of movement of the strand, which means that the latter can be monitored very easily and precisely and control interventions can be carried out very precisely or can be carried out always have a reproducible effect, making it very easy to achieve exact sequences of steps.
  • a device in which the step-by-step direct current motor is connected to a control unit, which issues control commands in a duration and sequence which can be set as a function of the program, a pulse generator which digitally monitors the angle of rotation of the motor and an up / down counter connected downstream of this, is characterized by a further one Feature of the invention characterized in that the up-down counter is connected to a microprocessor, which in turn is connected to a ROM storing the pulses specified for each sub-step of the motor, and the signals corresponding to the difference between the counter reading and the specified pulses, preferably via a Digital-to-analog converter, controls a pulse-length modulating DC amplifier that supplies the DC motor.
  • the pulses per unit of time change in such a way that there is a uniform change in the line speed, since each step is further broken down into sub-steps, so that the desired speed profile is reproducibly maintained in one step.
  • An optimal strand surface can thus be obtained, in which no disruptive notches occur even in the region of the collision of the individual annular strand sections. Then there is the possibility that after each sub-step a correction of the withdrawal distance can be carried out with the next sub-step, with which each step corresponds exactly to the conditions set.
  • the microprocessor is connected to a further ROM storing the sequence of steps of the start-up process.
  • the microprocessor is further connected to a time interval generator serving to specify the withdrawal time via a timer .
  • FIG. 1 shows a block diagram
  • FIG. 2 shows a diagram of the speed sequence during a step.
  • the strand 1 is gradually pulled out of the mold 2, which is firmly connected to the melt container 3. It attacks the pair of gripping rollers 4a and 4b directly on the strand.
  • the gripping roller 4a sits on the axis of the DC motor 5.
  • the motor is connected to an encoder E, which outputs 20,000 pulses per motor revolution to the up or down counter Z.
  • the pulses specified for each individual step are transmitted via the interface I 1 and compared the microprocessor M with the ROM 1.
  • the microprocessor reduces or increases the length of the pulses supplied to the motor 5 via the interface I 2 and the digital-to-analog converter K and the pulse-length modulating DC amplifier V.
  • the microprocessor M is also connected to the time interval generator W via a timer T.
  • the withdrawal time which is specified depending on the alloy to be processed, can be set by the time interval generator W.
  • the exact movement sequence for the starting process is stored in ROM 2.
  • the number of sub-steps required forwards and backwards per step is stored in RAM.
  • the start-up takes place via the on-off switch S and the interface I 3 , the program being predetermined by the program selector P.
  • the step-by-step DC motor does not have its own axis.
  • the rotor which has the windings which are supplied with the current pulses via four brushes, has a cylindrical recess for the axis of the gripping roller 4a.
  • the outside diameter of the rotor is approx. 27 inches (approx. 70 cm) and the inside diameter is 18 inches (approx. 50 cm). This design of the engine means that a high torque can be achieved even when the engine is starting up.
  • the stator has the permanent magnet part.
  • the diagram shown in Fig. 2 shows the change in speed of the strand withdrawal.
  • the strand is slowly moved until a maximum speed is reached, whereupon the speed is slowly reduced and then the strand is pushed back.
  • the entire step takes 1.1 seconds and the individual sub-steps are at least 1/20 seconds apart or less. Due to the constant change in the strand speed, a shock-like movement of the liquid metal in the strand shell, which is still very thin and therefore mechanically unstable, is avoided, so that a homogeneous structure of the strand can be achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Moulding By Coating Moulds (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Forwarding And Storing Of Filamentary Material (AREA)
  • Machine Translation (AREA)
EP81890169A 1980-11-18 1981-10-19 Dispositif de coulée continue horizontale Expired EP0052598B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT5651/80 1980-11-18
AT0565180A AT381882B (de) 1980-11-18 1980-11-18 Vorrichtung zum horizontalen stranggiessen

Publications (2)

Publication Number Publication Date
EP0052598A1 true EP0052598A1 (fr) 1982-05-26
EP0052598B1 EP0052598B1 (fr) 1987-04-29

Family

ID=3578144

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81890169A Expired EP0052598B1 (fr) 1980-11-18 1981-10-19 Dispositif de coulée continue horizontale

Country Status (9)

Country Link
US (1) US4602669A (fr)
EP (1) EP0052598B1 (fr)
JP (1) JPS57109547A (fr)
AT (2) AT381882B (fr)
BR (1) BR8107428A (fr)
CA (1) CA1171233A (fr)
DE (1) DE3176144D1 (fr)
ES (1) ES505708A0 (fr)
ZA (1) ZA816631B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077950A1 (fr) * 1981-10-22 1983-05-04 Alumax Inc. Appareil et procédé pour la coulée de métal fondu
EP0171973A3 (en) * 1984-08-09 1986-12-30 Nippon Kokan Kabushiki Kaisha Flow stop control method for casting withdrawal control of horizontal continuous casting machine
EP0174146A3 (en) * 1984-09-05 1987-01-21 Nippon Kokan Kabushiki Kaisha Billet control method in a horizontal continuous casting system
EP0426501A1 (fr) * 1989-11-03 1991-05-08 Steel Casting Engineering, Ltd. Système de commande du mouvement, par exemple pour un dispositif de coulée continue horizontale
EP0493790A3 (en) * 1990-12-26 1992-08-05 Kawasaki Jukogyo Kabushiki Kaisha Method of and apparatus for withdrawing strand in horizontal continuous casting installation

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60148653A (ja) * 1984-01-12 1985-08-05 Kobe Steel Ltd 水平連続鋳造設備における鋳型内面傷の防止方法
DE3502703A1 (de) * 1985-01-28 1986-07-31 INRESA Schultheiss GmbH, 7543 Engelsbrand Abzugsvorrichtung fuer eine stranggussmaschine
ES2759779T3 (es) * 2011-07-08 2020-05-12 Primetals Technologies Germany Gmbh Procedimiento y aparato para la fabricación de productos metálicos largos en una colada continua

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH507039A (de) * 1968-09-21 1971-05-15 Siemens Ag Einrichtung zum Ausziehen des Stranges aus der Kokille einer Stranggiessanlage
DE2110548B2 (de) * 1971-03-05 1974-08-01 Siemens Ag, 1000 Berlin U. 8000 Muenchen Einrichtung zum Steuern des schrittweisen Ausziehens eines Stranges aus einer horizontalen Stranggießkokille
DE2340636C3 (de) * 1973-08-10 1980-04-24 Siemens Ag, 1000 Berlin Und 8000 Muenchen Einrichtung zum schrittweisen Ausziehen eines Stranges aus einer horizontalen Stranggießkokille

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2815551A (en) * 1955-06-21 1957-12-10 British Iron Steel Research Method of and apparatus for the casting of metal
US3575230A (en) * 1968-03-07 1971-04-20 Albert Calderon Method of making steel
GB1380582A (en) * 1971-01-19 1975-01-15 Davy Int Ltd Method of continuously casting metal and apparatus therefor
US3726333A (en) * 1971-07-07 1973-04-10 Gen Motors Corp Control of continuous casting operation
DE2511913A1 (de) * 1975-03-19 1976-09-30 Sack Gmbh Maschf Stranggiessanlage fuer brammen
GB1524760A (en) * 1976-08-02 1978-09-13 Uss Eng & Consult Multistrand continuouscasting machine
JPS5424224A (en) * 1977-07-27 1979-02-23 Ishikawajima Harima Heavy Ind Intermittent and continuous driving apparatus in horizontal continuous casting machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH507039A (de) * 1968-09-21 1971-05-15 Siemens Ag Einrichtung zum Ausziehen des Stranges aus der Kokille einer Stranggiessanlage
US3669176A (en) * 1968-09-21 1972-06-13 Siemens Ag Drive system for continuous casting plants
DE1783032C3 (de) * 1968-09-21 1974-01-03 Siemens Ag, 1000 Berlin U. 8000 Muenchen Einrichtung zum Steuern des schrittweisen Ausziehens eines Stranges aus einer horizontalen Stranggießkokille
DE2110548B2 (de) * 1971-03-05 1974-08-01 Siemens Ag, 1000 Berlin U. 8000 Muenchen Einrichtung zum Steuern des schrittweisen Ausziehens eines Stranges aus einer horizontalen Stranggießkokille
DE2340636C3 (de) * 1973-08-10 1980-04-24 Siemens Ag, 1000 Berlin Und 8000 Muenchen Einrichtung zum schrittweisen Ausziehen eines Stranges aus einer horizontalen Stranggießkokille

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077950A1 (fr) * 1981-10-22 1983-05-04 Alumax Inc. Appareil et procédé pour la coulée de métal fondu
EP0171973A3 (en) * 1984-08-09 1986-12-30 Nippon Kokan Kabushiki Kaisha Flow stop control method for casting withdrawal control of horizontal continuous casting machine
EP0174146A3 (en) * 1984-09-05 1987-01-21 Nippon Kokan Kabushiki Kaisha Billet control method in a horizontal continuous casting system
EP0426501A1 (fr) * 1989-11-03 1991-05-08 Steel Casting Engineering, Ltd. Système de commande du mouvement, par exemple pour un dispositif de coulée continue horizontale
EP0493790A3 (en) * 1990-12-26 1992-08-05 Kawasaki Jukogyo Kabushiki Kaisha Method of and apparatus for withdrawing strand in horizontal continuous casting installation
EP0676252A3 (fr) * 1990-12-26 1996-04-24 Kawasaki Heavy Ind Ltd Procédé et dispositif pour l'évacuation de la barre coulée d'une installation de coulée continue horizontale.

Also Published As

Publication number Publication date
JPH0134707B2 (fr) 1989-07-20
ZA816631B (en) 1983-02-23
US4602669A (en) 1986-07-29
DE3176144D1 (en) 1987-06-04
BR8107428A (pt) 1982-08-10
AT381882B (de) 1986-12-10
CA1171233A (fr) 1984-07-24
EP0052598B1 (fr) 1987-04-29
ES8205599A1 (es) 1982-06-16
ATE26807T1 (de) 1987-05-15
ATA565180A (de) 1986-05-15
JPS57109547A (en) 1982-07-08
ES505708A0 (es) 1982-06-16

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