EP0071448A1 - Verfahren und Einrichtung zum Stranggiessen von Stahl - Google Patents

Verfahren und Einrichtung zum Stranggiessen von Stahl Download PDF

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Publication number
EP0071448A1
EP0071448A1 EP82303943A EP82303943A EP0071448A1 EP 0071448 A1 EP0071448 A1 EP 0071448A1 EP 82303943 A EP82303943 A EP 82303943A EP 82303943 A EP82303943 A EP 82303943A EP 0071448 A1 EP0071448 A1 EP 0071448A1
Authority
EP
European Patent Office
Prior art keywords
drive
steel cast
brake
brake force
slip
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
EP82303943A
Other languages
English (en)
French (fr)
Other versions
EP0071448B1 (de
Inventor
Osamu C/O Sakaiseitetsusho Tsubakihara
Takashi C/O Sakaiseitetsusho Manno
Makoto C/O Yawataseitetsusho Imamura
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of EP0071448A1 publication Critical patent/EP0071448A1/de
Application granted granted Critical
Publication of EP0071448B1 publication Critical patent/EP0071448B1/de
Expired legal-status Critical Current

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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
    • B22D11/1282—Vertical casting and curving the cast stock to the horizontal
    • 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 present invention relates to a method of continuous casting of steel and an apparatus therefor, or more in particular to a method and an apparatus for compression continuous casting of steel in which steel cast is drawn along a path including a curved reforming section and the driving force is applied to the steel cast upstream of the reforming section while the braking force is applied thereto downstream of the reforming section.
  • the steel drive torque or steel pressing force of the drive rollers upstream of the reforming section is controlled in such a manner as to apply a predetermined compressive force to the steel cast at the steel reforming section under given casting conditions.
  • the torque of the drive rollers is increased progressively with advancement of the steel cast.
  • An object of the present invention is to provide a method of continuous casting in which the casting speed determined by the casting conditions is maintained stable and the drive rollers are driven with a torque which is as near to the critical torque as possible, but not so large as to cause the drive rollers to slip.
  • Another object of the present invention is to provide an apparatus for performing the above-mentioned method.
  • the above-mentioned objects are achieved by a method of continuous casting and an apparatus therefor in which the brake force of brake rollers downstream of the curved reforming section is controlled in such a way that the drive torque of motors for driving the drive rollers for feeding the steel cast to the curved reforming section does not exceed but approaches as near to a critical target value as possible without causing a substantial slip between the drive rollers and the steel cast.
  • the casting speed is stabilized and the compressive force is maintained at a high value within a predetermined range.
  • Such a slip if caused, changes the casting speed.
  • at least one drive roller is monitored, and if it slips, the brake force of the brake rollers is reduced, and when the slip ceases, the brake force of the brake rollers is increased not to exceed but to approach the critical target value as near as possible.
  • the compressive force decreases, and if the slip is considerable, the casting speed changes momentarily.
  • the decrease in the brake force due to a slip is larger than the reduction of the brake force which is provided for eliminating the slip.
  • the drive roller and the brake roller are monitored for a slip, and if any of the rollers slips, the brake force of the brake roller is reduced, and when the slip ceases, the brake force therof is increased again.
  • guide rollers including drive rollers and brake rollers are divided into a drive group upstream of a curved reforming section 1 and brake groups I and II downstream thereof.
  • the drive force of motors (not shown) coupled to the drive rollers (black circles) of the drive group and the brake force of motors (not shown) coupled to the brake rollers (black circles) of the brake groups I and II are controlled by the brake control device 2.
  • slip sensors 3 1 and 3 2 The slip, if any, of the drive group is detected by slip sensors 3 1 and 3 2 , while the slip of the brake group I is detected by slip sensors 3 3 and 3 4 , and that of the brake group II is detected by slip sensors 3 5 and 3 6 .
  • Each of these slip sensors is supplied with a signal generated by a tacho-generator coupled to one of the drive or brake rollers and a signal generated by a tacho-generator coupled to one of non-drive guide rollers.
  • the two signals are smoothed and compared with each other by the slip sensor, and if the rotational speed of the drive roller is higher than that of the non-drive guide roller by more than a predetermined value, or if the rotational speed of the non-drive roller is higher than that of the brake roller by more than a predetermined value, then the slip sensor generates a signal of high level "1", which signal is applied through an OR gate to the brake control device 2.
  • a steel cast sensor 4 1 is arranged at a predetermined position in the brake group I, so that when the leading end of the steel cast entering the particular region reaches that position, it is detected and a signal of high level "1" is generated.
  • This "1" signal is applied to the brake control device 2 as a brake start signal for the brake group I. This is in order not to start the braking operation of the brake group I before the steel cast enters the region of the brake group I by more than a certain distance (hereinafter called the effective brake distance) in view of the fact that a sufficient braking effect does not act on the steel cast unless the steel cast enters the region of the brake group I by more than the effective brake distance.
  • the effective brake distance a certain distance
  • the region of the brake group II includes a steel sensor 4 2 for generating a signal of high level "1" when the steel cast enters the region by the effective brake distance. This "1" signal is applied to the brake control device 2 as a brake start signal for the brake group II.
  • a configuration of the brake control device 2 is shown in Fig. 2.
  • the brake control device 2 is impressed with a target value indicative of the critical drive torque or motor current which is sufficiently large to maintain the speed of the motors (drive group) determined by the casting conditions, and provides the steel cast portion of the curved reforming section with a desired compressive force but not so large as to cause any slip between the steel cast and the drive rollers or the brake rollers.
  • the brake control device 2 is also supplied with an actual drive torque or motor current for driving the drive rollers.
  • the difference (error) between the critical drive torque and the actual drive torque is computed at the device 2 and an error signal representing the difference is applied to a slow ramp circuit 2a.
  • the slow ramp circuit 2a includes a limiter LMC1 and an integrator INT1.
  • the portion of the error signal above the positive limit which is predetermined by taking into consideration the characteristics of the apparatus and the operating conditions thereof and the portion thereof lower than the negative limit similarly predetermined are cut off by the limiter LMC1 so that an error signal confined within the two critical limits is applied to the integrator INT1.
  • the integrator I N T1 integrates this error signal by a comparatively long predetermined time constant so that sharp variations of the error signal level are absorbed, thereby producing a stable signal level with moderate variations, if any.
  • the error signal T thus stabilized is applied to brake force proportional distributors 2b l and 2b 2 including operational amplifiers.
  • the distributors 2bi and 2b 2 are supplied, through a switch SWla, with the load share or ratio A of the brake torque or motor current of the motors for the brake group I and, through a switch SW2a, with the load share or ratio B of the brake torque or motor current of the motors for the brake group II.
  • the distributors 2b l and 2b 2 produce outputs ⁇ T and ⁇ T respectively.
  • the output of the distributor 2b l makes up a brake control signal for controlling the brake current for the motors for the brake group I, while the output of the distributor 2b 2 provides a brake control signal for controlling the motors for the brake group II.
  • These signals are applied to the slow ramp circuits 2c 1 and 2c 2 respectively, which are constructed similarly to the slow ramp circuit 2a and include a limiter for cutting off those portions of the brake current for each brake group which exceed a predetermined critical value, above which a slip may occur, and an integrator for smoothing the brake control current to minimize the unfavorable effect on the casting speed control.
  • the control signal thus smoothed is applied through the switches SWlb and SW2b to brake currnt control loops 2d l and 2d 2 respectively.
  • the drive speed control loops 2e l and 2e 2 are provided for driving the motors for the brake groups I and II under non-braking conditions, and are supplied with a speed indication signal for indicating the rotational speed through the switches SWlc and SW2c respectively
  • the integrators of the slow ramp circuits 2c l and 2c 2 are connected with a brake reducing circuit 2f, which includes a brake cancel level setter DCV and a switch SW3.
  • a brake reducing circuit 2f which includes a brake cancel level setter DCV and a switch SW3.
  • a switch SW3 When this switch SW3 is closed, a signal corresponding to the setting of the setter DCV is applied to the integrators of the circuits 2c 1 and 2c 2 .
  • Each of the integrators operates in such a manner as to suspend the integration of a first input from the corresponding limiter and integrate a second input from the setter DCV negatively. As a result, the output of.
  • the integrators is rapidly reduced at a rate corresponding to the second input, so that the indication value of the brake current (generation current) to the brake current loops 2d l and 2d 2 is reduced thereby to lower the brake torque of the brake motor.
  • This switch SW3 is closed when the output of the OR gate is high at "1", namely, when one of the drive rollers or brake rollers slips, and is opened when the output of the OR gate is reduced to "0" after the slip.
  • the switch SW3 opens, the integrators of the circuits 2ci and 2c 2 resume the integration of the first input from the limiters, so that the output thereof increases at a rate corresponding to the first input.
  • the switches SWla to SWlc are operatively interlocked with each other; the switches SWla and SWlb being normally open, the switch SWlc being normally closed.
  • the switches la and lb are closed and the switch SWlc is opened.
  • the switches SW2a to SW2c are also operatively interlocked with each other in such a manner that when the output of the steel cast sensor 4 2 increases to high level of "1" indicating the detection of steel cast, the switches SW2a and SW2b are closed while the switch SW2c is opened.
  • SW4a and SW4b designate normally-open switches for controlling the drive of the steel cast at the time of drawing thereof.
  • a torque setting of the motors of the drive motor group predetermined as mentioned above according to the casting conditions and the actual torque or current value of the motors are applied to the brake control device 2. Also, the switches SW4a and SW4b are closed. Since the steel cast sensors 4 1 and 4 2 have not yet detected the steel cast, the switches SWlc and SW2c are closed while the switches SWlb and SW2b are open, and the motors of the brake groups I and II are activated as motors at a speed corresponding to a speed indication.
  • the motors of the brake group I are switched to dynamic braking, thus starting the brake control as controlling the brake torque toward the target brake torque T determined as above-mentioned or toward a maximum brake torque determined by the limiter of the circuit 2c l , when the target torque T is higher than the brake critical value.
  • both the brake groups I and II exert the braking force on the steel cast.
  • the braking force does not exceed the above-mentioned upper critical value, in view of the fact that this force is controlled to a target value lower than the upper critical value in consideration of the slip of the drive motors.
  • the limiter and the integrator prevent a sudden change of the total torque applied to the steel cast, and therefore the speed of the motors for the drive group is not changed greatly.
  • a slip may occur, and when such a slip occurs, the switch SW3 is closed, so that the output of the integrators of the slow ramp circuits 2c l and 2c 2 is sharply reduced and the braking dynamic current of the brake groups I and II is decreased thereby to sharply reduce the braking force.
  • the slip is rapidly eliminated.
  • the switch SW3 is opened, and the outputs of the integrators of the circuits 2ci and 2c 2 are restored at a slow rate by the difference between the braking current target value and actual braking current, thus increasing the braking force.
  • the switches SW4a and SW4b are opened, while the switches SWlb and SW2b are opened and the switches SWlc and SW2c are closed, with the result that the motors of the brake groups I and II are driven as motors at the designated speed.
  • the outputs of the steel cast sensors 4 1 and 4 2 and the output of the OR gate are applied to a control board and a drive group motor control system.
  • the motor torque and the motor current are proportional to each other and, in the above description of the embodiment, the motor torque has the same meaning as the motor current.
  • Fig. 3a shows the drawing speed of the steel cast
  • Fig. 3b shows a drive torque setting of the motor for the drive group
  • Fig. 3c shows an energizing current (corresponding to torque) of the motors for the drive group
  • Figs. 3d and 3e show a drive current (+) for speed control and a generation current (corresponding to the braking torque) for braking operation of the motors of the brake groups I and II respectively.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP19820303943 1981-07-28 1982-07-26 Verfahren und Einrichtung zum Stranggiessen von Stahl Expired EP0071448B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11820881A JPS601108B2 (ja) 1981-07-28 1981-07-28 鋼の連続鋳造方法
JP118208/81 1981-07-28

Publications (2)

Publication Number Publication Date
EP0071448A1 true EP0071448A1 (de) 1983-02-09
EP0071448B1 EP0071448B1 (de) 1986-03-12

Family

ID=14730871

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820303943 Expired EP0071448B1 (de) 1981-07-28 1982-07-26 Verfahren und Einrichtung zum Stranggiessen von Stahl

Country Status (6)

Country Link
EP (1) EP0071448B1 (de)
JP (1) JPS601108B2 (de)
AU (1) AU530786B2 (de)
CA (1) CA1195088A (de)
DE (1) DE3269813D1 (de)
ES (1) ES8401872A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0171973A2 (de) * 1984-08-09 1986-02-19 Nippon Kokan Kabushiki Kaisha Kontrollverfahren während einer Durchflussunterbrechung beim Steuern des Strangausziehens in einer Horizontalstranggussmaschine
EP0426501A1 (de) * 1989-11-03 1991-05-08 Steel Casting Engineering, Ltd. Bewegungssteuersystem, zum Beispiel für eine Horizontalstranggiessmaschine
LU90402B1 (de) * 1999-05-31 2000-12-01 Wurth Paul Sa Richttreiberanlage fuer eine Stranggiessanlage fuer Knueppel und Vorbloecke
EP1125657A2 (de) * 2000-02-19 2001-08-22 SMS Demag AG Verfahren und Anlage zum Giessen von Vorprodukten in einer Stranggiessanlage
CN111185584A (zh) * 2020-02-27 2020-05-22 北京首钢股份有限公司 一种板坯铸机铸坯控制的方法及系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4623619B2 (ja) * 2001-07-18 2011-02-02 新日本製鐵株式会社 連続鋳造機の鋳片圧縮力制御装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3776298A (en) * 1971-07-02 1973-12-04 Mannesmann Ag Apparatus for controlling the pressure force in multi-roll drives for equipment withdrawing an ingot from a continuous casting machine along a curved path
DE2530032A1 (de) * 1974-07-12 1976-02-19 Uss Eng & Consult Verfahren und vorrichtung zur bestimmung der auf einen stranggusskoerper bei dessen verfestigung in einer stranggiessmaschine einwirkenden kraefte
DE2747000A1 (de) * 1976-10-20 1978-04-27 Uss Eng & Consult Verfahren zum steuern der zwischen fuehrungswalzen und einem strang ausgeuebten kraefte sowie eine diesbezuegliche walzenpaaranordnung
US4148349A (en) * 1976-05-08 1979-04-10 Yutaka Sumita Method for controlling slippage between rolls and a slab in a continuous compression casting apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3776298A (en) * 1971-07-02 1973-12-04 Mannesmann Ag Apparatus for controlling the pressure force in multi-roll drives for equipment withdrawing an ingot from a continuous casting machine along a curved path
DE2530032A1 (de) * 1974-07-12 1976-02-19 Uss Eng & Consult Verfahren und vorrichtung zur bestimmung der auf einen stranggusskoerper bei dessen verfestigung in einer stranggiessmaschine einwirkenden kraefte
US4148349A (en) * 1976-05-08 1979-04-10 Yutaka Sumita Method for controlling slippage between rolls and a slab in a continuous compression casting apparatus
DE2747000A1 (de) * 1976-10-20 1978-04-27 Uss Eng & Consult Verfahren zum steuern der zwischen fuehrungswalzen und einem strang ausgeuebten kraefte sowie eine diesbezuegliche walzenpaaranordnung

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0171973A2 (de) * 1984-08-09 1986-02-19 Nippon Kokan Kabushiki Kaisha Kontrollverfahren während einer Durchflussunterbrechung beim Steuern des Strangausziehens in einer Horizontalstranggussmaschine
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
EP0426501A1 (de) * 1989-11-03 1991-05-08 Steel Casting Engineering, Ltd. Bewegungssteuersystem, zum Beispiel für eine Horizontalstranggiessmaschine
LU90402B1 (de) * 1999-05-31 2000-12-01 Wurth Paul Sa Richttreiberanlage fuer eine Stranggiessanlage fuer Knueppel und Vorbloecke
EP1125657A2 (de) * 2000-02-19 2001-08-22 SMS Demag AG Verfahren und Anlage zum Giessen von Vorprodukten in einer Stranggiessanlage
EP1125657A3 (de) * 2000-02-19 2003-09-10 SMS Demag AG Verfahren und Anlage zum Giessen von Vorprodukten in einer Stranggiessanlage
CN111185584A (zh) * 2020-02-27 2020-05-22 北京首钢股份有限公司 一种板坯铸机铸坯控制的方法及系统
CN111185584B (zh) * 2020-02-27 2021-10-01 北京首钢股份有限公司 一种板坯铸机铸坯控制的方法及系统

Also Published As

Publication number Publication date
EP0071448B1 (de) 1986-03-12
ES514418A0 (es) 1984-01-01
AU8625082A (en) 1983-03-17
ES8401872A1 (es) 1984-01-01
AU530786B2 (en) 1983-07-28
JPS601108B2 (ja) 1985-01-11
JPS5820361A (ja) 1983-02-05
CA1195088A (en) 1985-10-15
DE3269813D1 (en) 1986-04-17

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