EP0697930B1 - Dispositif de commande des mouvements d'une lingotiere - Google Patents

Dispositif de commande des mouvements d'une lingotiere Download PDF

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Publication number
EP0697930B1
EP0697930B1 EP94915586A EP94915586A EP0697930B1 EP 0697930 B1 EP0697930 B1 EP 0697930B1 EP 94915586 A EP94915586 A EP 94915586A EP 94915586 A EP94915586 A EP 94915586A EP 0697930 B1 EP0697930 B1 EP 0697930B1
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EP
European Patent Office
Prior art keywords
ingot mold
motion
law
eccentric
support
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 - Lifetime
Application number
EP94915586A
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German (de)
English (en)
French (fr)
Other versions
EP0697930A1 (fr
Inventor
Jacques Barbe
Thierry Darle
François Mazodier
Zalman Padwo
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.)
KVAERNER CLECIM
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Individual
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Publication of EP0697930A1 publication Critical patent/EP0697930A1/fr
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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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/053—Means for oscillating the moulds

Definitions

  • the present invention relates to a method and a device for controlling the movements of an ingot mold of a continuous casting assembly animated by reciprocating movements along a casting line.
  • a continuous casting installation comprises an ingot mold or shell, consisting of a bottomless mold limiting a cavity open at its two ends and whose walls are cooled vigorously so that the molten metal poured into it upper orifice of the mold forms, along the cooled walls, a solidified crust having a sufficient thickness and metallurgical quality, at the level of the lower orifice, to allow the continuous evacuation of a product limited by said solidified crust and of which the central part which remains liquid gradually solidifies in a so-called secondary cooling device placed downstream of the mold, in the casting direction, and in which are placed, in addition, extraction means, for example rollers driven in rotation, which allow the product to be pulled down at an adjustable speed which depends on the casting conditions.
  • the mold has a substantially vertical axis and the secondary cooling device, which forms a corset for guiding the product, is curved so as to bring the horizontally cast product horizontally, to facilitate its evacuation and its cutting into sections of 'a certain length.
  • the mold is removably attached to a support and guide table, which is connected to an electro-mechanical, and / or hydromechanical guide and control assembly.
  • the latter can be, for example, an eccentric system giving the mold a sinusoidal movement.
  • Other oscillation systems for example with cams or with hydraulic control, give wider possibilities for adjusting the oscillation movement and allow, for example, to produce a speed diagram of the sinusoidal, square, sawtooth type. Or other.
  • the ingot mold table is maintained by guides which make it follow the desired path, and, on the other hand, is connected to actuators which give it an alternating movement of oscillation.
  • actuators which give it an alternating movement of oscillation.
  • Eccentric or cam systems or hydraulic cylinder systems can be used to control the oscillations of the mold. Eccentric systems can act directly on the ingot mold support table or, via a connecting rod, on the lever which supports the ingot mold and, at the same time, gives it the oscillating movements.
  • the law of motion has a sinusoidal shape.
  • the profile of the cam can be adjusted so as to obtain a determined movement law allowing, for example, to give the ingot mold a speed of ascent greater than the speed of descent and to unevenly distribute the duration of the cycles. product support and return.
  • Cylinder oscillation systems give still other adjustment possibilities making it possible, for example, to produce a speed diagram of the square, sawtooth or other type.
  • a liquid lubricant can be used in the case of free-jet casting, or else, in the case of a submerged nozzle casting, a powder which is poured onto the meniscus formed by the liquid metal at the top of the ingot mold and which melts in contact with the metal. It is advantageous to use products which, in addition to their lubricating power, fulfill the functions of a slag such as the absorption of inclusions.
  • the liquid slag thus formed in contact with the metal meniscus descends along the cooled walls of the mold, forming a thin film between the wall and the solidified crust.
  • the product extraction speed i.e. the casting speed V C cannot be kept constant or even limited to a narrow range. In fact, this speed already depends on the cross section of the product, small section billets being poured at speeds much higher than those which are accepted for products of larger dimensions such as blooms or slabs.
  • the subject of the invention is a new method and devices which, on the contrary, allow the oscillation system of the mold to be operated by means of an interactive system which, taking into account the actuator in place in the installation. , will fix a motion law of the mold corresponding, optimally, to the casting conditions at all times.
  • the invention provides a method and a device for controlling the movements of the mold making it possible to adapt the law of movement at all times to the casting conditions in order to maintain the quality of the product obtained.
  • the invention therefore relates to a device for controlling the oscillations of a mold in a continuous metal casting machine comprising a mold mounted on a support, means for holding the mold on a substantially vertical trajectory and a system for generating an alternating oscillation movement of the ingot mold along said trajectory, comprising an actuator, a member for controlling a periodic movement of the actuator according to a determined law of movement and means for transforming the periodic movement of the actuator in a back-and-forth movement of the ingot mold, the law of movement of the actuator being fixed so as to determine the values of at least certain parameters of the movement of the ingot mold such as the amplitude of the oscillations, their frequency and the variation in the speed of movement of the mold up and down during each cycle.
  • the device comprises a means for instantaneous correction of the speed of movement of the ingot mold determined by said law of movement primary so that the oscillation of the mold, during each cycle, follows an optimal law of motion adapted at all times to the casting conditions.
  • the speed variation means is a movement creation system according to an additional law which adds its action to the movement determined by the control member so that the law of movement resulting from the conjunction of the additional law with the primary law is optimally adapted to the casting conditions at each instant.
  • the invention can be applied, in particular, to any movement generation system in which the actuator consists, for example, of an eccentric or of a cam driven in rotation by an electric or hydraulic motor, by the 'through a transmission assembly.
  • the speed variation means controls the drive motor or one of the elements of the transmission assembly, thanks to a movement creation system controlled according to a mathematical and knowledge law, making it possible to act on all parameters such as the frequency, the distribution of negative stripping and ascent times for each cycle, as well as the shape of the connections between these two phases of the movement.
  • the amplitude of the movement will be considered as a constant parameter for the chosen mathematical law.
  • the law of knowledge may evolve during casting, in an established or transient regime, to correct the effect of parameters which could modify the surface quality of the cast product.
  • the eccentric system consists of at least one group of two eccentrics arranged between the ingot mold support and the frame of the assembly, the two eccentrics being driven by the same drive shaft, which is connected to the motor by the movement transmission assembly.
  • the eccentric system consists of at least one group of two eccentrics arranged between the ingot mold support and the frame of the assembly, one of the two eccentrics being driven by the motor with the transmission assembly movements, the other eccentric being driven by the first eccentric by means of a coupling rod.
  • the eccentric system consists of at least one eccentric disposed between the ingot mold support and the frame of the assembly, the ingot mold support being carried by levers articulated on a support fixed on the frame of the assembly, the eccentric being driven by the engine with its transmission assembly.
  • the eccentric system consists of at least one eccentric disposed between the mold support and the frame of the assembly, the mold support being carried by levers articulated on a support fixed to the frame, l the eccentric being connected to the control arm of one of the levers and being driven by the motor with its transmission assembly, the control arm being located on the other side of said lever relative to its articulation on the support fixed to the frame, and the eccentricity can be adjusted by a special device.
  • the eccentric system consists of at least one eccentric disposed between the ingot mold support and the frame of the assembly, the ingot mold support being carried by levers articulated on a support fixed to the frame of the together, said support being in two parts, a part fixed to the frame, and a mobile part hinging with respect to the fixed part by means of an actuating cylinder, the levers hinging on the mobile part, the eccentric being disposed between the control arm of one of the levers, and a base fixed to the frame, the control arm being disposed on the other side of said lever relative to its articulation on the movable part of the support; the eccentric being driven by the motor with its transmission assembly.
  • the system with hydraulic cylinder (s) consists of at least two hydraulic cylinders arranged between the ingot mold support and the frame of the assembly.
  • system with hydraulic actuator (s) consists of at least one hydraulic actuator arranged between the ingot mold support and the frame of the assembly, the ingot mold support being carried by articulated levers on a support fixed to the frame of the assembly.
  • the system with hydraulic actuator (s) consists of at least one hydraulic actuator arranged between the ingot mold support and the frame of the assembly, the ingot mold support being carried by articulated levers on a fixed support to the frame, the hydraulic cylinder being disposed between the control arm of one of the levers and a fixed base, the control arm being located on the other side of said lever relative to its articulation on the support fixed to the frame.
  • the system with hydraulic actuator (s) consists of at least one hydraulic actuator arranged between the ingot mold support and the frame of the assembly, the ingot mold support being carried by articulated levers on a support fixed to the frame of the assembly, said support being in two parts, a part fixed to the frame, and a mobile part hinging with respect to the fixed part by means of an actuating cylinder, the levers s articulated on the movable part, the hydraulic cylinder being disposed between the control arm of one of the levers, and a base fixed to the frame, the control arm being disposed on the other side of said lever relative to its articulation on the mobile part of the support.
  • the invention can also be applied to a system for generating reciprocating movements comprising at least one hydraulic actuator associated with supply means determining an alternating movement of the actuator according to a periodic law.
  • the speed variation means controls the supply of the hydraulic actuator from an additional law determined by a model or tables so as to adapt the periodic law of the actuator to the casting conditions at each instant.
  • the entire mold movement management system can operate automatically and includes temporary recovery means on order manual and means of final validation of corrections made manually.
  • the system can also operate in a closed loop and then includes self-checking means based on measurements made in situ.
  • the control system comprises a model or tables for developing instructions corresponding to the casting conditions for obtaining optimum quality, a position sensor generating a signal measurement of the position of the ingot mold at each instant, a setpoint correction element receiving, on its various inputs, the setpoints developed by the model, the position measurement and setpoints or information relating to the product and all of the machine, and a regulating control member of the speed variation means from a position setpoint produced at each instant by the setpoint correction element.
  • the management system connects a set of manual corrections to the regulated command so as to act on said regulated command, having priority over the position setpoints generated by the correction element of instructions, which it neutralizes.
  • the setpoint correction element receives information and / or manual setpoints, which take precedence over the setpoints relating to the product or to the whole machine, which they neutralize.
  • the tables or the model are themselves managed by a self-adapting system, which permanently receives the position measurement of the mold, so as to take into account what has actually been achieved, and to adapt the values of the tables or the model in it or sending them from new instructions.
  • the auto-adapter system has an automatic immediate validation system, which can be interrupted and postponed at will by the operator.
  • a human-machine dialogue link between the auto-adapter system and the tables or the model, makes it possible to capture the necessary information, and to send the chosen adaptations to the tables or the model.
  • the device for controlling the movements of an ingot mold according to the invention, as well as its management method thus have the advantage of having relative rise and fall times, which can be adapted at any time on demand, from so as to achieve the quality of the product to be obtained.
  • the control device relates to the movements of an ingot mold, the assembly of which includes a system for generating alternative movements, associated with a holding system as well as a system for guiding the ingot mold, examples of which are are shown in Figures l to 5.
  • the system for generating reciprocating movements is constituted by an eccentric system which controls the support 2 of the ingot mold 1.
  • This type of eccentric system is driven by a motor 4 with which it is connected by a 5 movement transmission set.
  • This curve can be adapted to the need but, normally, is fixed once and for all by the movement generation system, in particular by the profile of the cam and one can, normally, only act on the frequency of the oscillations by varying the speed of rotation of the cam and, possibly, on their amplitude by acting on the motion transmission system.
  • the mold 1 is mounted in a support frame 2 associated with guides not shown which allow to maintain the axis of the casting cavity on a determined path, the assembly being animated a vertical back and forth movement by two eccentrics 10 mounted on a drive shaft 11 which is rotated by a motor 4, by means of a movement transmission assembly 5, the assembly being mounted on a support frame 3.
  • the mold and its support frame 2 are driven back and forth by at least a group of two eccentrics 20 which are arranged between the support 2 of the mold 1 , and the frame 3 of the assembly.
  • one of the two eccentrics 20 ' is driven by the motor 4 with the movement transmission assembly 5.
  • the other eccentric 20 is driven by the first eccentric 20 by means of a coupling shaft 21.
  • the system for generating alternative movements of the ingot mold l is constituted by a system with hydraulic cylinder (s), this system with hydraulic cylinder (s) consists of at least two hydraulic cylinders which are arranged between the support 2 of the ingot mold 1 and the frame 3 of the assembly in place of each of the eccentrics 20.
  • the system for generating the alternative movements of the ingot mold 1 is constituted by an eccentric system comprising at least one eccentric 30 disposed between the support 2 of the ingot mold and the frame 3 of the assembly .
  • the ingot mold is supported and maintained on its trajectory by two pairs of connecting rods 31 articulated, respectively, on two support pieces 2 of the ingot mold 1 and on a frame 32 fixed to the frame of the assembly.
  • the oscillation movements are controlled by two eccentrics 30 integral in rotation and driven by the motor 4 by means of the transmission assembly 5.
  • the eccentricity and therefore the amplitude of the oscillations can be adjusted by a device of known type.
  • the actuator which generates the reciprocating movements of the ingot mold is therefore an eccentric bearing directly on the support of the ingot mold, the latter being held in its path by guide means.
  • the guiding function can also be ensured by the movement generation system as, for example, in the case of FIG. 4 where the ingot mold is supported and maintained in its path by a pair of levers 41 and a pair of connecting rods 41 'articulated on the support 2 of the mold 1 and on a frame 42 fixed to the frame 3 of the installation.
  • Each lever 41 is extended beyond its articulation axis 44 by an arm 43 fixed at its end on a securing bar 46 on which the oscillation movement is applied. This is controlled, for example, by an eccentric or a cam 40, by means of a connecting rod 47.
  • An electric or hydraulic motor 4 rotates the eccentric 40 via a transmission assembly 5.
  • FIG. 5 A similar system has been shown in the case of FIG. 5, the ingot mold being supported and maintained on its trajectory by a pair of levers 51 associated with holding rods 51 ′ and articulated around axes 57 on a frame 54 bearing on it on the frame 3.
  • the frame 54 rests, in service, on a fixed part 53 secured to the frame 3 and can tilt around a fixed axis 52, under the action of a jack 55, so as to separate the entire upper part from the casting axis.
  • Figures 1 to 5 therefore schematically represent the arrangements usually used to generate oscillating movements of the mold along a guided trajectory and it will be seen that the invention can be adapted to all these embodiments.
  • the movement generation system can be constituted by one or more hydraulic cylinders generally arranged in place of the eccentrics.
  • the invention makes it possible to make instantaneous corrections to the speed of movement of the ingot mold determined by the oscillation control member by means of a speed variation device, which cooperates with the system of generation of alternative movements, so as to obtain relative climb speeds and lowering the mold which are adapted to the quality of the product to be obtained.
  • Figure 7 is a diagram showing, on the ordinate, the variation of the speeds of the ingot mold as a function of the time indicated on the abscissa.
  • the positive speeds correspond to an upward movement of the ingot mold and the negative speeds to a downward movement.
  • the product descends at a negative speed Vc considered as constant on the diagram.
  • Curve (a) represents an oscillation cycle which takes place over a total time TO.
  • the movement is adjusted so that the speed of descent of the mold exceeds the speed of casting for a time TSN called "negative stripping time".
  • TSN time TSN
  • the remaining part of the cycle which corresponds to the return time TP of the ingot mold, the latter moves upward relative to the product poured at the speed VC.
  • the duration TP of the BCDE part corresponds to the "return time" of the ingot mold.
  • the invention makes it possible to permanently correct the speed of movement determined by the primary motion law as a function of the casting conditions at the instant considered, so as to obtain an optimal motion law.
  • the invention allows, taking into account the characteristics of the motion generation system which determines the primary motion law, to add thereto an additional motion law defined by an auxiliary system for creating movements from a model or tables allowing to take into account, interactively, all the casting conditions at the time considered.
  • the system for generating alternative movements consists of an eccentric system, as in the examples shown in Figures 1 to 5, this eccentric system cooperates with the speed variation device from instructions developed by a model or tables referenced MM, which controls the motor 4 or one of the elements of the transmission assembly 5, as shown schematically in Figures 8, 9 and 10.
  • FIG 8 there is shown schematically the mold 1 driven by the motor 4 by means of a transmission assembly 5 of movements.
  • a model or MM tables directly controls the motor 4, so as to have the relative rise and fall times of the ingot mold adapted exactly to the quality of the product to be obtained.
  • the movement transmission assembly 5 comprises an epicyclic train 61.
  • This epicyclic train 61 is constituted by a ring 62 which meshes with satellites 64. These satellites 64 in turn mesh with a sun gear or sun 63.
  • the satellites 64 are mounted idly on a planet carrier 65.
  • the main motor 4 drives a pinion 66 which meshes with an outer ring 67, integral with the ring 62 of the planetary gear.
  • An auxiliary motor 60 drives the sun gear or sun 63, and the planet carrier 65 is connected to the mold 1 by the eccentric system. In this type of embodiment, it is the auxiliary motor 60 which is controlled by the model or the tables MM.
  • this assembly makes it possible to vary the output speed on the door -satellites 65 at the exact desired value.
  • a variant of the invention can be done by controlling the main motor 4 by means of the model and / or the MM tables, according to the speeds to be obtained and the mechanical forces to be supplied.
  • FIG. 9 A variant of this device shown in Figure 9 is the object of Figure 10.
  • the sun gear or sun 63 is driven by a hydraulic cylinder 68, which is itself controlled by the model or the MM tables , so as to vary the output speed on the planet carrier 65, in order to obtain the relative rise and fall times of the mold, which are required to obtain the quality of the desired product.
  • this main motor 4 can be a hydraulic motor.
  • this may be a hydraulic motor.
  • Figure 11 is a diagram of a management system according to the invention for managing at any time the position of the mold l, by the control device, by means of a model or MM tables, which sends its instructions to a CC setpoint correction element.
  • the correction element of setpoints CC permanently receives the position measurement MP from the mold 1 by means of a position sensor CP, as well as the setpoints or information ID relating to the product and to the machine.
  • the setpoint correction element CC then acts on the regulated command SP of the mechanical or hydraulic system for positioning the ingot mold, by sending the position setpoint P at any time.
  • the management system has a set of manual corrections CM, which is connected to the regulated control SP of the mechanical or hydraulic system for positioning the ingot mold l.
  • This set of manual corrections CM acts on the regulated command SP, so as to have priority over the position setpoints P generated by the setpoint correction element CC, which this set neutralizes.
  • the setpoint correction element CC also receives information and / or manual setpoints ICM, which take precedence over the setpoints or information ID, which they neutralize.
  • the system also includes an SAD autoadapter assembly, which permanently receives the measurement of positions MP from the ingot mold l and makes it possible to take into account what has actually been done to modify the values of the tables or of the MM model, so as to develop new instructions better suited to the casting conditions observed.
  • SAD autoadapter assembly which permanently receives the measurement of positions MP from the ingot mold l and makes it possible to take into account what has actually been done to modify the values of the tables or of the MM model, so as to develop new instructions better suited to the casting conditions observed.
  • the SAD autoadapter system has an immediate and automatic validation system V, which can be interrupted and deferred at will.
  • a human-machine dialogue D connection can be provided, between the SAD autoadapter system, and the tables or the MM model, so as to capture the necessary information, and to send the chosen adaptations to the tables or the MM model.
  • Figure 12 schematically shows, by way of example, the entire system for controlling the movements of an ingot mold 1 mounted on a support 2, the oscillations of which are controlled by an actuator of the type described in Figures 1 to 4, example an eccentric or a cam 10 driven by a motion generator 4 such as an electric motor.
  • the latter can be driven at a constant speed which determines the frequency of the oscillations whose amplitude depends on the characteristics of the mechanical transmission system.
  • the motor 4 thus defines a law of primary sinusoidal or sawtooth movement, as indicated in FIG. 6.
  • the speed of rotation of the motor 4 determined by the primary motion law is corrected, without modification of the initial settings, by an automatic management system comprising a calculator 7 of the parameters of the final motion law which must follow the ingot mold according to the casting conditions.
  • a command 72 makes it possible to display on the computer 7 the parameters corresponding to the choice of the operating mode taking into account the state of the law of motion of the engine 4 displayed by a control system 73, 74.
  • a function generator 75 draws up the instructions corresponding to the motion law which the ingot mold must respect at the instant considered and which are displayed on the supply 76 of the motor 4 to correct the speed of the latter.
  • a system 77 for controlling the behavior of the ingot mold makes it possible to measure at all times the characteristics of the casting such as the casting speed, the frequency, the stroke, the level of metal, the consumption of powder, the friction, etc. .
  • All of the information is collected by a processing system 78 and a recorder 79 makes it possible to verify all of the operation and, in particular, the anomalies.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP94915586A 1993-05-04 1994-05-04 Dispositif de commande des mouvements d'une lingotiere Expired - Lifetime EP0697930B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9305304 1993-05-04
FR9305304A FR2704788B1 (fr) 1993-05-04 1993-05-04 Dispositif de commande des mouvements d'une lingotiere.
PCT/FR1994/000521 WO1994025201A1 (fr) 1993-05-04 1994-05-04 Dispositif de commande des mouvements d'une lingotiere

Publications (2)

Publication Number Publication Date
EP0697930A1 EP0697930A1 (fr) 1996-02-28
EP0697930B1 true EP0697930B1 (fr) 1997-01-22

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EP94915586A Expired - Lifetime EP0697930B1 (fr) 1993-05-04 1994-05-04 Dispositif de commande des mouvements d'une lingotiere

Country Status (6)

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EP (1) EP0697930B1 (ja)
JP (1) JPH08509425A (ja)
KR (1) KR960701714A (ja)
DE (1) DE69401582T2 (ja)
FR (1) FR2704788B1 (ja)
WO (1) WO1994025201A1 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT516074A1 (de) * 2014-08-04 2016-02-15 Inteco Tbr Casting Technologies Gmbh Oszillationsantrieb für eine Kokille
AT517006B1 (de) * 2015-04-07 2018-08-15 Primetals Technologies Austria GmbH Stranggießen mit optimierter Oszillation der Stranggießkokille

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2032609T3 (es) * 1988-01-28 1993-02-16 Clecim Procedimiento y dispositivo para la oscilacion de una lingotera de colada continua de acero.
DE4117052A1 (de) * 1990-07-23 1992-11-26 Mannesmann Ag Fluessigkeitsgekuehlte kokille fuer das stranggiessen von metallen

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Publication number Publication date
DE69401582D1 (de) 1997-03-06
KR960701714A (ko) 1996-03-28
FR2704788B1 (fr) 1995-07-28
EP0697930A1 (fr) 1996-02-28
FR2704788A1 (fr) 1994-11-10
JPH08509425A (ja) 1996-10-08
WO1994025201A1 (fr) 1994-11-10
DE69401582T2 (de) 1997-06-12

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