WO1990011149A1 - Moule reglable de coulee continue d'acier - Google Patents

Moule reglable de coulee continue d'acier Download PDF

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Publication number
WO1990011149A1
WO1990011149A1 PCT/DE1989/000187 DE8900187W WO9011149A1 WO 1990011149 A1 WO1990011149 A1 WO 1990011149A1 DE 8900187 W DE8900187 W DE 8900187W WO 9011149 A1 WO9011149 A1 WO 9011149A1
Authority
WO
WIPO (PCT)
Prior art keywords
walls
mold
shape
steel
strand
Prior art date
Application number
PCT/DE1989/000187
Other languages
German (de)
English (en)
Inventor
Hannes Schulze Horn
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to PCT/DE1989/000187 priority Critical patent/WO1990011149A1/fr
Publication of WO1990011149A1 publication Critical patent/WO1990011149A1/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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0408—Moulds for casting thin slabs
    • 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
    • B22D11/05—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds into moulds having adjustable walls
    • 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
    • B22D11/207—Controlling or regulating processes or operations for removing cast stock responsive to thickness of solidified shell
    • 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
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould

Definitions

  • the invention relates to a mold for the continuous casting of steel, in particular for the continuous casting of broad strips for further processing as cold strip, the mold having cooled walls which surround the strand or the strip and are stationary during the casting process, between which there is an opening for the outlet of the solidified steel is arranged.
  • DE 36 37 893 AI also discloses a process for producing a tolerance-compliant primary material for cold rolling, in which a strip with a thickness in the range between 25 and 60 mm is first cast and placed in a maximum of three or four roll stands with the highest possible number of passes Gauge is brought. Although this method delivers flawless strips with the final dimensions as required for the further cold forming, the investment is still high.
  • the object is achieved in that at least part of the walls of the continuous casting mold are designed to be elastically adjustable.
  • This configuration of the walls of the continuous casting mold can advantageously achieve an optimal adaptation of the cast strand or strip to the further processing requirements with or without recrystallization or compression post-deformation using the known techniques of continuous casting. Even wide steel strips, for example in the range from 1.5 to 2.5 m in width, can thus be produced in a tolerance-conforming manner by continuous casting.
  • the contour for the subsequent shaping can particularly advantageously be controlled such that the subsequent further processing proceeds optimally.
  • a band formation with a spherical contour to compensate for the roll bending during post-forming is necessary just as easy to set up as a completely flat training course.
  • the outlet opening parts of the walls are designed to be shape-adjustable in a controlled manner. It is not absolutely necessary to specifically form the entire shape, in particular the upper part, in which the steel to be cast is still completely or partially liquid. In advantageous simplification, it is often possible to adjust the shape of the shape to the lower area, i.e. to restrict the outlet opening part of the walls. At the same time, a good surface is advantageously achieved in this way and the friction is reduced when the strand is pulled out. The necessary mold adjustability of the walls of the casting mold is thus limited to the essential shaping zone of the cast steel.
  • the thermal wall stresses have a superimposed tensile force during the casting process, which means that tensile and / or bending forces, e.g. in the case of a shell-shaped wall, which can result in a regulated shape with a uniform distribution of stress in the thermally stressed layer.
  • tensile and / or bending forces e.g. in the case of a shell-shaped wall
  • the shape of the walls is advantageously stabilized.
  • Control elements and force introduction elements are provided for introducing adjusting forces and the superimposed voltages.
  • machine elements for example hydraulic cylinders or motor-driven spindles.
  • These elements are designed to be adjustable according to the task. Larger adjustment paths are only to be taken into account for the tension elements in the transverse direction of the mold, which have to absorb the thermal expansion over the width of the mold.
  • the elements, which essentially serve as reset elements, have only small adjustment paths.
  • the walls themselves can have a plate shape. This is the simplest design, which also enables an exact calculation of the necessary adjustment paths.
  • walls which are designed as open profiles and which are particularly advantageously in the form of a shell which is open on one side and curved in the strand or band direction can be used. Profiles are more resistant to bending and warping than panels, and their bulge is also less. As a result, fewer actuators with lower actuating forces are required to achieve the desired shape.
  • the shape to be achieved and its influence by the actuators can be determined in advance automatically, in particular on a microprocessor basis, but can also be determined experimentally.
  • the walls When forming the walls, it is advantageous if the walls have edges facing away from the strand, which form, for example, an inlet and / or an outlet contour and are more easily deformable, for example corrugated, with respect to the inner part of the walls.
  • the edges facing away from the strand result in both a good inlet contour, which can be adapted to the fluidity of the steel, as well as the possibility of a good force application for the adjusting elements.
  • the edge on the exit side stabilizes the wall shape in the area in which the solidification zone is to be located.
  • a frame for holding the walls and for articulating the force introduction elements and actuators is arranged outside the walls.
  • This frame also provides a reference form for the actuating elements and the measuring devices, and it also offers the possibility of exchanging the form according to the invention completely quickly.
  • the frame is advantageously displaceable transversely, e.g. standing on a roller conveyor. Repairs to the control elements, measuring devices, etc. are thus quicker and easier possible outside the working area.
  • ultrasound sensors are preferably provided in rows, with which the casting gap thickness and / or the thickness of the strand or strip is also continuously measured.
  • the distance between the individual parts of the mold results in an echo which can be used for checking the relative position of the walls of the mold in its individual sections.
  • the detachment of the strip from the mold surface can also be determined and checked continuously easily and simply.
  • the scanning need not take place continuously, but the individual measuring points can advantageously be queried successively by an automation device, in particular on a microprocessor basis.
  • the individual query of the measuring points advantageously reduces the amount of data to be evaluated, and a statistical evaluation and a trend calculation can also be interposed.
  • the ultrasonic measurement is not the only measurement that can be carried out, particularly when casting strips, due to the small wall distances. It can also be one additional measurements are carried out by electrical sensors, which in particular determine the position of the solidification front. For this purpose, you can use the distortion effect of an oscillating circuit in the crystallization of the liquid melt, which leads to an oscillating circuit detuning of measuring oscillating circuits arranged in the different sections of the mold.
  • the differences in the electrical behavior in the formation of the second crystals compared to the behavior of the pure melt are small, but a sensitive resonant circuit can detect and evaluate these differences.
  • the form has a cooling system with cooling channels which allow controllable cooling of individual sections of the walls.
  • This enables the steel's solidification to be influenced in a targeted manner, particularly in the case of wide strips.
  • the formation and location of the solidification zone can thus be regulated.
  • the cooling system baffles and control elements e.g. Control valves, which the cooling medium, e.g. Add water, adjustable to wall sections of the mold.
  • the cooling medium e.g. Add water
  • the cooling system for the individual walls is advantageously designed as a cassette that can be placed in front of the walls from the outside. This means that it can be designed and manufactured independently of the molded walls.
  • the cassette can be carried out inexpensively in sheet metal and can be replaced easily and simply together with the control elements.
  • the cooling water itself is advantageously conducted in a recooling system, so that no permanent cooling water supply is necessary and a low inlet temperature of the cooling water can be achieved. If the casting speed is increased, it is advantageously possible, after sufficient testing, to also provide a cooling liquid other than water. It is advantageous to work with a silicone oil in order to reduce the amount of heat that is transported by the coolant. to increase considerably.
  • the working range of a silicone oil is between below O ⁇ C and 180 "C, this is considerably better than the working range from 20 ° C to 80" C, with which normal cooling water can be used.
  • the walls at the outlet opening have spray cooling which is arranged in the outlet contour. This enables an advantageous utilization of the outlet contour area. At the same time the underside of the mold is cooled and there is a favorable influence on the grain formation of the cast steel. The scale formation is also reduced.
  • the walls have position sensors which are arranged in a distributed manner, preferably inductively or capacitively, and that a strand or strip shape measuring device is provided on the outlet side.
  • the measured values which are determined by position sensors or by the strand or strip shape measuring device, can advantageously serve as higher-level control variables for the control process of the wall contour, since with them, the dimensions of the end product can sometimes be independent. directly reproducing measured values can be obtained. This results in a previously unattainable design security.
  • the strand or tape form measuring device can work both contactlessly and scanning. Measuring rollers are influenced uniformly and predictably by the retarding layer which forms and is still thin at the outlet.
  • a temperature profile measuring device in particular a scanner, is provided on the outlet side for measuring the temperature over the strand width.
  • a temperature scanner provides a control value for the cooling work in the individual, adjacent cooling sections and also a reference to the position of the solidification zone in the mold. Just as about the trend of the amount of heat dissipated in the Individual cooling sections of the steel can also be used to form a higher-level control loop for the cooling.
  • the design and arrangement of the control loops and their linkage in an automation device results from the analogous application of the controls already known in rolling mills, as described, for example, from the Siemens magazine "Drive Technology and Process Automation in Metallurgical und Walzwerke ", booklet of the 47th year (1973) is known.
  • FIG. 1 shows the principle of shape in supervision
  • FIG. 2 shows the principle of shape in side view
  • FIG. 3 shows the principle of shape in cross section
  • FIG. 4 shows a basic cross-sectional and measuring point representation with the inflow and outflow area of the steel.
  • FIG. 1, 1 designates a frame which runs around the outside of the continuous casting mold and is preferably cooled to reduce distortion and which laterally surrounds the walls 2, 3, 4 and 5 of the mold.
  • the walls 2 and 3 of the mold which run transversely to the strand or band direction, advantageously have a longitudinal tensile element 7 on one side, which exerts a longitudinal tensile force on the walls 2 and 3.
  • the longitudinal tensile force is advantageously regulated in such a way that the walls 2 and 3 are only fully stretched through it, but are not greatly expanded. This element can work with a relatively low constant force independent of the path.
  • the actuators 8 serve both to compensate for the torsion, the warping and bulging of the wall parts, and also for setting a preselected strip contour by influencing the casting gap 6 in order to achieve the most favorable post-deformation conditions.
  • the sensors 9 for example ultrasound sensors, electrical sensors or position buttons, determine both the exact position of the individual wall sections in the frame 1, the respective thickness of the gap 6 and the position and length of the solidification front, and by an automation device 33 in an analog manner Evaluated way to a roll control in the rolling mill and used to regulate the casting process and the contour of the strip.
  • the longitudinal tensile force in the case of a plate-shaped configuration of the walls 2 and 3, these having angled edges, is advantageously applied by four hydraulic cylinders 10 or electrically operated spindles, which preferably in the direction of the plate diagonal Act.
  • the longitudinal tensile elements 10 engage on the end faces 11 of the frame 1.
  • Sensors 13 and actuators 14, which measure the relative position and the length of the solidification front and the gap thickness, are preferably distributed in rows, the density and occupation of which increase in the casting direction, over the width of the wall 2 which is designed like a plate with flared edges 12 or adjust.
  • the sensors 13 and the actuators 14, like the longitudinal tension elements 10, are connected to the automation device 33, which constantly controls and adjusts the shape and also the cooling of the continuous casting mold as well as, if applicable, the speed of the pull-out rollers or rollers 32.
  • the pull-out rollers 32 or 32 optionally work with or without post-forming. If the casting speeds are sufficiently high, the post-deformation required for further processing can already take place here.
  • the cooling cassette which is preferably of modular construction, has guide plates 16 which are fastened to the cooling cassette rear wall 15.
  • the baffles 16 form cooling channels 17 between them.
  • the cooling channels 17 form a honeycomb structure, so that a targeted, section-wise approach of the coolant flows 18 to the wall 2 and its edges 12 is possible.
  • Control valves 19, via which the amount of coolant is regulated, are used to regulate the coolant flows 18. The amount of heat dissipated is determined in special counters, not shown. Also not shown is the coolant circuit with the recooler, which can be carried out in a known manner.
  • the molten steel enters the continuous casting mold at a predetermined temperature that is higher than the crystallization temperature of the steel.
  • the steel is first cooled down to the crystal formation temperature which occurs below the upper edge of the plate-shaped wall parts 2, 3.
  • the beginning of the crystal formation is indicated by the line 20 shown.
  • the solidification front is formed in line 21, to which strip 22 adjoins. It is particularly advantageous if the initial front lies completely in the part of the mold on the outlet side, but it is also possible that, in particular in the case of thicker strips, i.e. with a thickness between 10 and 50 mm, the solidification wedge that forms extends into the region of the edges 12.
  • the edges 12 are advantageously of corrugated design, as indicated in FIG. 3 next to the outer edge 23.
  • a temperature setting zone 26 is advantageously, but not necessarily, arranged above the mold, which is shown here as a shell mold 24 with essentially parallel central sections 25.
  • the temperature setting zone 26 in which a temperature homogeneous If the liquid steel is produced, the temperature of the liquid steel is adjusted to the changing requirements of the casting process.
  • Zone 26 has heating and cooling elements 27 and 28 as well as an arrangement, not shown, of coils for stirring the melt.
  • the temperature distribution in this zone is measured continuously, for example pyro etrically or by thermocouples.
  • a division of the heating and / or cooling is used for the purpose of homogenization.
  • the inlet part of the mold is advantageously provided with cooling that can be regulated in sections, just like the actual solidification part of the mold.
  • Spray cooling may also take place in the outlet part 29 of the mold, which prevents the solidification front from possibly breaking through in the case of thicker strips and ensures aftercooling which reduces scale formation.
  • a thickness measuring device 30 which, like a temperature measuring device 31, forms values for a superimposed control loop for the mold setting and cooling.
  • the thickness gauge 30 may e.g. be designed as an ultrasonic measuring device, as a radiometric measuring device or also as a scanning device with ceramic rollers. It can optionally be designed to measure in strips or as a transverse scanning device.
  • the pull-out rollers 32 are still essential for the casting process. All the measuring, control and regulating devices described above are advantageously connected to one another via an automation device 33, which links the individual functions of the casting process from the temperature setting of the molten steel to the pull-out roller force. It preferably has a representation of the pouring gap in the area of the solidification front as well as a representation of the cooling process. This enables an indirect visual control of the casting process.
  • the automation device 33 is in particular intended to control the casting speed in such a way that, depending on the specification, a maximum output or a predetermined quantity per unit of time is achieved.
  • the above description has described the invention in principle details. It goes without saying that their adaptation to the respective operational circumstances, for example to the charging options, is carried out by structural designs on the input side.
  • the mean wall thickness of the mold depends on the thickness of the cast strand or tape. A first approximation is obtained by the ratio 1: 1 in the forming gap, which applies approximately to a 10 mm thick strip. In the case of thicker strips, the ratio is smaller and the thinner strips are larger.
  • the wall thickness can advantageously decrease in the direction of passage of the strand or strip.
  • the automation device 33 is programmed according to the methods known for process control. Modifications according to known continuous casting techniques are possible, for example the horizontal exit of the strand or strip.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

Un moule de coulée continue d'acier, notamment de coulée continue de larges feuillards destinés à être travaillés ultérieurement à froid, comprend des parois refroidies fixes pendant la coulée qui entourent la billette ou le feuillard et entre lesquelles est agencée une ouverture de sortie de l'acier solidifié. Au moins des parties des parois (2, 3, 4, 5) sont élastiquement déformables de manière ajustable. Les parois (2, 3) du moule de coulée continue comprennent des éléments (7, 10) d'application de force, tels que des vérins hydrauliques ou des broches entraînées par des moteurs de manière notamment réglable, qui servent d'éléments (8, 14) de réglage du moule, notamment d'éléments réglables de rappel.
PCT/DE1989/000187 1989-03-23 1989-03-23 Moule reglable de coulee continue d'acier WO1990011149A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/DE1989/000187 WO1990011149A1 (fr) 1989-03-23 1989-03-23 Moule reglable de coulee continue d'acier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE1989/000187 WO1990011149A1 (fr) 1989-03-23 1989-03-23 Moule reglable de coulee continue d'acier

Publications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5836375A (en) * 1994-10-11 1998-11-17 Voest-Alpine Industrieanlagenbau Gmbh Continuous casting mold
WO2000013820A1 (fr) * 1998-09-08 2000-03-16 Thyssen Krupp Stahl Ag Procede de production de bandes d'acier de charge optimisee

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE750887C (de) * 1941-12-19 1945-02-05 Geschlitzte Stranggussgiessform
FR1327931A (fr) * 1962-04-13 1963-05-24 Machine pour la coulée de pièces métalliques de longueur indéterminée, en particulier de tubes en bronze
FR1554350A (fr) * 1967-02-13 1969-01-17
DE1508809A1 (de) * 1965-11-15 1969-11-13 Continua Internat Continuous C Verfahren und Durchlaufkokille zum Stranggiessen von Metallen,insbesondere in Form von Brammen,Platten oder Blechen
US3580327A (en) * 1968-07-15 1971-05-25 Georgy Lukich Khim Continuous casting mold
US3923091A (en) * 1973-04-17 1975-12-02 Mannesmann Ag Method of supervising skin thickness in a solidifying body such as a continuously cast ingot
LU73509A1 (fr) * 1974-10-05 1976-04-13
US4030536A (en) * 1973-04-30 1977-06-21 Alcan Research And Development Limited Apparatus for continuous casting of metals
GB2109721A (en) * 1981-10-30 1983-06-08 Griset Ets Apparatus for the continuous casting of metals such as copper alloys
DE3423475A1 (de) * 1984-06-26 1984-11-29 Mannesmann AG, 4000 Düsseldorf Verfahren und einrichtung zum stranggiessen von fluessigen metallen, insbesondere von fluessigem stahl

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE750887C (de) * 1941-12-19 1945-02-05 Geschlitzte Stranggussgiessform
FR1327931A (fr) * 1962-04-13 1963-05-24 Machine pour la coulée de pièces métalliques de longueur indéterminée, en particulier de tubes en bronze
DE1508809A1 (de) * 1965-11-15 1969-11-13 Continua Internat Continuous C Verfahren und Durchlaufkokille zum Stranggiessen von Metallen,insbesondere in Form von Brammen,Platten oder Blechen
FR1554350A (fr) * 1967-02-13 1969-01-17
US3580327A (en) * 1968-07-15 1971-05-25 Georgy Lukich Khim Continuous casting mold
US3923091A (en) * 1973-04-17 1975-12-02 Mannesmann Ag Method of supervising skin thickness in a solidifying body such as a continuously cast ingot
US4030536A (en) * 1973-04-30 1977-06-21 Alcan Research And Development Limited Apparatus for continuous casting of metals
LU73509A1 (fr) * 1974-10-05 1976-04-13
GB2109721A (en) * 1981-10-30 1983-06-08 Griset Ets Apparatus for the continuous casting of metals such as copper alloys
DE3423475A1 (de) * 1984-06-26 1984-11-29 Mannesmann AG, 4000 Düsseldorf Verfahren und einrichtung zum stranggiessen von fluessigen metallen, insbesondere von fluessigem stahl

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5836375A (en) * 1994-10-11 1998-11-17 Voest-Alpine Industrieanlagenbau Gmbh Continuous casting mold
WO2000013820A1 (fr) * 1998-09-08 2000-03-16 Thyssen Krupp Stahl Ag Procede de production de bandes d'acier de charge optimisee

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