EP0052598B1 - Vorrichtung zum horizontalen Stranggiessen - Google Patents

Vorrichtung zum horizontalen Stranggiessen Download PDF

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Publication number
EP0052598B1
EP0052598B1 EP81890169A EP81890169A EP0052598B1 EP 0052598 B1 EP0052598 B1 EP 0052598B1 EP 81890169 A EP81890169 A EP 81890169A EP 81890169 A EP81890169 A EP 81890169A EP 0052598 B1 EP0052598 B1 EP 0052598B1
Authority
EP
European Patent Office
Prior art keywords
motor
strand
withdrawal
rom
microprocessor
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.)
Expired
Application number
EP81890169A
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German (de)
English (en)
French (fr)
Other versions
EP0052598A1 (de
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
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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(B1) "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/de
Application granted granted Critical
Publication of EP0052598B1 publication Critical patent/EP0052598B1/de
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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, which act directly on the strand, for gradually pulling the strand out of the mold according to the preamble of claim 1.
  • the strand which 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 process, 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 cause the individual strand skin sections that form in the mold to be firmly welded together.
  • the first arrangement consists of jaws which grip 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 withdrawal can be achieved if gripper rollers directly engage the strand, since with this strand withdrawal there is constant contact between the strand and the gripper rollers, which is a prerequisite for the exact strand withdrawal.
  • a device for the batchwise conveying of a metallic casting strand wherein a pair of conveying 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 a relatively complicated design and does not allow a completely exact movement sequence, so that the disadvantages already mentioned occur.
  • a device for horizontal continuous casting with a fixed slide mold and a pair of gripping rollers driven by a DC motor for gradually pulling the strand out of the mold is known, the DC motor being connected to a control unit and this in a program-dependent setting duration and sequence Outputs 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.
  • 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.
  • 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 rotational speed of the motor, since the power transmission system between the motor and gripper 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 provides that a pause is maintained when a predetermined torque is exceeded, as a result of which waiting for the strand skin ring formed to be detached from the mold.
  • This device is complicated and prone to failure, so that in many cases the required Operational security is not given.
  • 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 simple structure and ensures a particularly exact deduction.
  • a device for horizontal continuous casting with a fixed sliding mold one or more pairs of gripper rollers, which are driven by a step-by-step DC motor and act directly on the strand, for gradually pulling the strand out of the mold, the motor being connected to a control unit , which issues control commands in program-dependent adjustable duration and sequence, wherein a pulse generator digitally monitoring the angle of rotation of the motor and a downstream up-down counter are provided, which is characterized in that at least one gripper roller and the DC motor have a common axis or the axes the same are coupled directly to one another and the up-down counter is connected to a microprocessor which in turn is connected to a ROM which stores the pulses specified for each sub-step of the motor, and which by means of the difference between the Counts and signals corresponding to the given pulses, preferably via a digital-to-analog converter, controls a pulse-length modulating DC amplifier which supplies the DC motor.
  • the combination of the direct coupling of the drive motor and the gripping roller with the new movement sequence control according to the invention allows a very precise control of the device to be achieved with relatively little effort, in which the lengths of the pulses per unit of time change in such a way that a pulse changes due to the pulse length modulating DC amplifier uniform change in the strand speed results, since each step is further divided into sub-steps, so that the desired speed profile is reproducibly maintained in each 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 draw-off distance can take place with the next sub-step, with which each step corresponds exactly to the conditions set.
  • ROM read only memory
  • RAM random access memory
  • Interface used here and later have the meanings as they come from Georg Franz: Technical Words of Electronics, Franzis-Verlag, Kunststoff (1980) pages 78 , 75 and 41.42 emerge.
  • encoder used later means encryption device, see also “encoded” and “encoding” in De Vries: Engish-German Technical and Engineering Dictionary, McGraw-Hill, New York, 1 edition (1960), page 294.
  • the microprocessor is connected to a further ROM which stores the sequence of steps of the starting 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 delivers 20,000 pulses per motor revolution to the up or down counter Z.
  • the predetermined for each individual sub-step pulses are compared via the interface 1 1 and the microprocessor M to the ROM. 1
  • the microprocessor via the interface 1 2 and the digital-analog converter K and the pulse width modulating direct current amplifier V, the length of the motor 5 supplied pulses.
  • 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 1 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 winding, which is 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. 70 cm and the inside diameter is approx. 50 cm. This design of the engine enables a high torque to be achieved even when the engine is starting up.
  • the stator has the permanent magnet part.
  • the diagram shown in Fig. 2 shows the speed change 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 thus 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)
  • Machine Translation (AREA)
  • Forwarding And Storing Of Filamentary Material (AREA)
EP81890169A 1980-11-18 1981-10-19 Vorrichtung zum horizontalen Stranggiessen Expired EP0052598B1 (de)

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 EP0052598A1 (de) 1982-05-26
EP0052598B1 true EP0052598B1 (de) 1987-04-29

Family

ID=3578144

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81890169A Expired EP0052598B1 (de) 1980-11-18 1981-10-19 Vorrichtung zum horizontalen Stranggiessen

Country Status (9)

Country Link
US (1) US4602669A (enrdf_load_stackoverflow)
EP (1) EP0052598B1 (enrdf_load_stackoverflow)
JP (1) JPS57109547A (enrdf_load_stackoverflow)
AT (2) AT381882B (enrdf_load_stackoverflow)
BR (1) BR8107428A (enrdf_load_stackoverflow)
CA (1) CA1171233A (enrdf_load_stackoverflow)
DE (1) DE3176144D1 (enrdf_load_stackoverflow)
ES (1) ES8205599A1 (enrdf_load_stackoverflow)
ZA (1) ZA816631B (enrdf_load_stackoverflow)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4523624A (en) * 1981-10-22 1985-06-18 International Telephone And Telegraph Corporation Cast ingot position control process and apparatus
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
JPS6146364A (ja) * 1984-08-09 1986-03-06 Nippon Kokan Kk <Nkk> 水平連続鋳造機における鋳片の流れ止め制御方法
JPS6163349A (ja) * 1984-09-05 1986-04-01 Nippon Kokan Kk <Nkk> 水平連続鋳造設備における鋳片押戻量制御方法
DE3502703A1 (de) * 1985-01-28 1986-07-31 INRESA Schultheiss GmbH, 7543 Engelsbrand Abzugsvorrichtung fuer eine stranggussmaschine
KR910009363A (ko) * 1989-11-03 1991-06-28 원본미기재 수평 연속 주조기용 동작 제어 시스템
US5293925A (en) * 1990-12-26 1994-03-15 Kawasaki Jukogyo Kabushiki Kaisha Method of and apparatus for withdrawing strand in horizontal continuous casting installation
PL2543454T3 (pl) * 2011-07-08 2020-02-28 Primetals Technologies Germany Gmbh Sposób i urządzenie do wytwarzania długich wyrobów stalowych w odlewaniu ciągłym

Family Cites Families (10)

* 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
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
GB1380582A (en) * 1971-01-19 1975-01-15 Davy Int Ltd Method of continuously casting metal and apparatus therefor
DE2110548C3 (de) * 1971-03-05 1975-03-27 Siemens Ag, 1000 Berlin Und 8000 Muenchen Einrichtung zum Steuern des schrittweisen Ausziehens eines Stranges aus einer horizontalen Stranggießkokille
US3726333A (en) * 1971-07-07 1973-04-10 Gen Motors Corp Control of continuous casting operation
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
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

Also Published As

Publication number Publication date
ATE26807T1 (de) 1987-05-15
ATA565180A (de) 1986-05-15
CA1171233A (en) 1984-07-24
AT381882B (de) 1986-12-10
JPS57109547A (en) 1982-07-08
DE3176144D1 (en) 1987-06-04
ZA816631B (en) 1983-02-23
ES505708A0 (es) 1982-06-16
US4602669A (en) 1986-07-29
JPH0134707B2 (enrdf_load_stackoverflow) 1989-07-20
BR8107428A (pt) 1982-08-10
EP0052598A1 (de) 1982-05-26
ES8205599A1 (es) 1982-06-16

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