EP4214006A1 - Machine de coulée continue et procédé de fonctionnement de la machine de coulée continue - Google Patents

Machine de coulée continue et procédé de fonctionnement de la machine de coulée continue

Info

Publication number
EP4214006A1
EP4214006A1 EP21773306.2A EP21773306A EP4214006A1 EP 4214006 A1 EP4214006 A1 EP 4214006A1 EP 21773306 A EP21773306 A EP 21773306A EP 4214006 A1 EP4214006 A1 EP 4214006A1
Authority
EP
European Patent Office
Prior art keywords
roller
strand
section
hot
hot strand
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.)
Pending
Application number
EP21773306.2A
Other languages
German (de)
English (en)
Inventor
Franz Wimmer
Jeffrey Morton
Alfred Trauner
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.)
Primetals Technologies Austria GmbH
Original Assignee
Primetals Technologies Austria GmbH
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 Primetals Technologies Austria GmbH filed Critical Primetals Technologies Austria GmbH
Publication of EP4214006A1 publication Critical patent/EP4214006A1/fr
Pending legal-status Critical Current

Links

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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • 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
    • B22D11/009—Continuous casting of metals, i.e. casting in indefinite lengths of work of special cross-section, e.g. I-beams, U-profiles
    • 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
    • B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use

Definitions

  • the invention relates to a continuous casting plant according to patent claim 1 and a method for operating such a continuous casting plant according to patent claim 10 .
  • EP 3 135 402 A1 discloses a continuous casting installation for producing a rectangular hot strand.
  • an improved continuous casting plant for alternately casting a first hot strand with a rectangular and a second hot strand with an elliptical or circular cross section from a metallic melt
  • the continuous casting plant having a strand guide with at least one first driver stand and a second driver stand offset in the conveying direction of the first hot strand.
  • the first driver frame has a first pair of rollers with a first roller and a second roller
  • the second driver frame has a second pair of rollers with a third roller and a fourth roller.
  • the first hot strand or the second hot strand can be guided through between the first pair of rollers and the second pair of rollers.
  • the rollers are each rotatably mounted.
  • the first roller and the second roller each have a first running surface on the circumference, each of which is cylindrical in a first section.
  • the third roller and the fourth roller each have a cylindrical second running surface.
  • the third and fourth The roller and the first section of the first roller and the second roller are each designed to guide the first hot strand with the rectangular profile.
  • the first roller and the second roller In a second section of the first running surface adjoining the first section in a direction inclined to the conveying direction, the first roller and the second roller each have a first indentation formed circumferentially on the first running surface.
  • the first indentation of the first roller and the second roller are each designed to guide the second hot strand.
  • This configuration has the advantage that both the first hot strand with a rectangular cross-section and the second hot strand with a round cross-section can be produced by means of the continuous casting plant simply by changing the mold with an identical strand guide, without the strand guidance is to be adapted. Furthermore, it is ensured that the second hot strand has a particularly round profile on an outer peripheral side and flattening of the second hot strand is avoided.
  • the first roller and/or the second roller has a third section, the third section adjoining the direction of the second section on a side of the second section remote from the first section.
  • the first roller and/or the second roller is configured in a cylindrical manner. This configuration has the advantage that with the third section, the first and/or second roller can guide the first hot strand on both sides, so that tilting of the first hot strand between the first roller and the second roller can be reliably avoided.
  • the first section has a first outside diameter and the third section has a further outside diameter which is essentially identical to the first outside diameter.
  • the continuous casting plant can be operated in a first operating state and a second operating state.
  • a first mold with a rectangular mold cross-section is used in the continuous casting installation, and in the second operating state a second mold with a circular or elliptical mold cross-section is used.
  • the first mold is designed to cast the first hot strand with the rectangular cross section from the metallic melt and in the second operating state to cast the second hot strand with the circular or elliptical cross section from the metallic melt.
  • This configuration has the advantage that the continuous casting plant is able to cast hot strands of different cross-sectional shapes solely by changing between the first mold and the second mold, without further conversions being necessary.
  • the set-up times for producing the first hot strand with a rectangular cross section or for producing the second hot strand with a circular or elliptical cross section are particularly short. This ensures high capacity utilization of the continuous caster.
  • the first driver stand has a first measuring device, the first measuring device being designed to determine a first distance between the first roller and the second roller.
  • This configuration has the advantage that, by determining the distance, a thickness of the first hot strand can be determined before the first hot strand is introduced to the driver stand.
  • the second driver stand can be controlled particularly precisely on the basis of the first distance determined.
  • the continuous casting plant has at least one third driver stand, the third driver stand having a third pair of rollers, each with a rotatably mounted roller fifth role and a sixth role.
  • the third driver stand is arranged downstream of the second driver stand in relation to the conveying direction of the first hot strand.
  • the second driver framework is subordinate to the first driver framework.
  • the fifth roller and the sixth roller each have a third running surface on the circumference, each of which is designed in a cylindrical manner in a fourth section. In each case in a fifth section of the third running surface, which adjoins the fourth section in the direction, a second indentation is formed circumferentially on the third running surface.
  • the fourth section of the fifth roller and the sixth roller are each designed to rest against the first hot bar on both sides, with the second indentation of the fifth and sixth roller each being designed to guide the second hot bar.
  • This design has the advantage that the rectangular first hot strand and the second hot strand can be guided with the third driver stand. As a result, both the first and the second hot strand can be supported particularly well over the entire length of the strand guide, so that buckling of the first or the second hot strand while passing through the strand guide is avoided.
  • the third driver stand has a second measuring device, the second measuring device being designed to determine a third distance between the fifth roller and the sixth roller.
  • This configuration has the advantage that when the first hot strand is being produced, the second distance between the second pair of rollers can be regulated on the basis of the first distance and the third distance, for example in closed-loop control.
  • the first indentation is concave and has a curvature.
  • the first indentation is configured to form an outer peripheral side of the second hot bar with an outward curvature.
  • the curvature is preferably larger than the outer curvature.
  • the curvature is greater than the outer curvature by at least a factor of 1.2 to 1.6. mung .
  • the first driver stand has a first adjustment device, the first adjustment device being designed to move the first roller between a first position and a second position. In the first position, a first distance between the first roller and the second roller is smaller than in the second position of the first roller. It is particularly advantageous here if the first roller is in the first position for guiding the second hot bar and the first roller is held in the second position by the adjustment device for guiding the first hot bar. It is of particular advantage that the first roller and/or the second roller are driven, so that a pressing force that is to be supported by the first adjustment device when driving the second hot strand can be kept low.
  • the first hot strand with the rectangular cross section is cast from the metallic melt.
  • the casting of the first hot strand can also be referred to as the first operating state of the continuous caster.
  • the second hot strand with an elliptical or circular cross-section is cast from the molten metal.
  • the casting of the second hot strand can also be referred to as the second operating state of the continuous caster.
  • the first roller and the second roller with the second section lie on both sides tig to the second hot leg and preferably hold the second hot leg.
  • the fourth roller supports the second hot strand.
  • the third roller can be arranged at a distance from the second hot strand, so that flattening of the second hot strand is avoided. Part of the weight of the second hot strand is supported by the fourth roller.
  • This configuration has the advantage that the width of the first hot strand can be driven by means of the second driver stand and its thickness can be reduced.
  • the second driver stand with the third and fourth rolls is suitable for carrying out a soft reduction, ie when the first hot strand has an already solidified shell but the core is still liquid and the thickness of the hot strand is reduced.
  • a thickness of the first hot strand on the first driver stand is determined.
  • a second distance between the third roller and the fourth roller is determined as a function of the thickness determined on the first driver stand and a predefined target final thickness of the first hot strand at the end of the strand guide.
  • the third roller and the fourth roller are positioned relative to one another.
  • the sixth roller of the third driver stand supports the first hot strand with the fourth section and the fifth roller is arranged at a distance from the first hot strand.
  • the fifth and sixth rollers rest on both sides of the second hot strand, each with the fifth section.
  • a deformation, in particular a flattening of the second hot strand can be driven out/rolled out of the second hot strand by the third pair of rollers.
  • the fifth roller and the sixth roller bear against the first hot strand, each with the fourth section.
  • a final gauge of the first hot strand at the third driver stand is determined based on a third distance between the fifth roll and the sixth roll.
  • the determined third distance is taken into account when determining the second distance, with the guidance of the second hot strand through the strand guide, the fifth roller and the sixth roller resting on both sides of the second hot strand with the fifth section and supporting the second hot strand.
  • the second distance can be regulated to the desired final thickness in a closed loop.
  • FIG. 1 shows a schematic representation of a continuous casting plant according to a first embodiment
  • FIG. 2 shows a detail B, marked in FIG. 1, of the continuous casting plant shown in FIG. 1;
  • FIG. 3 shows a detail of a sectional view along a sectional plane CC shown in FIG. 2 through the first driver frame;
  • FIG. 6 shows a flowchart of a method for operating the continuous casting plant shown in FIGS. 1 to 5; 7 shows a sectional view along that shown in FIG.
  • Sectional plane CC through the continuous casting plant shown in FIG. 1 in the second operating state
  • FIG. 8 shows a sectional view along the sectional plane D-D shown in FIG. 2 through the continuous casting plant shown in FIG. 1 in the second operating state;
  • FIG. 9 shows a sectional view along the sectional plane E-E shown in FIG. 2 through the continuous casting plant shown in FIG. 1 in the second operating state.
  • the coordinate system has an x-axis (longitudinal direction), a y-axis (transverse direction) and a z-axis (height direction).
  • FIG. 1 shows a schematic representation of a continuous casting installation 10 .
  • the continuous casting plant 10 has, for example, a ladle 15 with an outlet pipe 20 . Furthermore, the continuous casting plant 10 comprises a distribution basin 25 arranged below the ladle 15 with a pouring tube 30 running in the z-direction and a stopper 35 arranged in the distribution basin 25 . In addition, the continuous casting plant 10 has a first mold 40 and a second mold 45, with the first mold 40 being inserted into the continuous casting plant 10 below, adjoining the pouring tube 30, by way of example in FIG.
  • the first mold 40 has a rectangular configuration in the sectional plane AA.
  • the first mold 40 has two narrow side plates which are arranged at least essentially parallel to one another and are hidden in FIG. 1 and each run in an xz plane.
  • the first mold 40 has two oppositely arranged wide side plates 50 which are wider than the narrow side panels.
  • the broad side plates 50 can each be arranged to run in a yz plane.
  • the mold 40 , 45 is cooled in the assembled state, preferably water-cooled.
  • the second mold 45 which is not used in FIG. 1, differs from the first mold 40, so that the second mold 45 has a rounded cross section, in particular a circular cross section, in the sectional plane AA.
  • the continuous casting plant 10 also has a strand guide 55 .
  • the strand guide 55 is arranged in FIG. 1 below a mold outlet 60 of the first mold 40 or the second mold 45, for example.
  • the mold outlet 60 is arranged on a side of the mold 40 , 45 facing away from the pouring tube 30 .
  • the continuous casting plant 10 has a first operating state and at least one second operating state.
  • the first operating state as shown in FIG. 1, the first mold 40 is inserted into the continuous casting plant 10.
  • the second mold 45 is inserted into the continuous casting installation 10 and the first mold 40 is dismantled.
  • the pouring pipe 30 opens out at the second mold 45 and in the first operating state, the pouring pipe 30 opens out at the first mold 40 .
  • a molten metal 65 in the ladle 15 preferably made of an iron material, in particular a steel material, for example X70, is poured into the distributor basin 25 via the outlet pipe 20 .
  • the molten metal 65 is introduced from the distributor basin 25 into the first mold 40 via the pouring tube 30, with a first mass flow of the molten metal 65 flowing into the first mold 40 being controlled with the aid of the plug 35.
  • the metallic melt 65 cools on its contact surfaces with the first mold 40, in particular on the broad side plates 50 and on the narrow side plates, and solidifies in the process, so that the metallic melt 65 in the form of a first hot strand 70 with a rectangular Cross-section underside at the mold outlet 60 from the first mold 40 exits.
  • a conveying direction 75 of the first hot strand 70 essentially runs in the z-direction.
  • the first hot strand 70 has a solidified first shell 100 a few centimeters thick, while a large part of its first cross section is still liquid on the inside.
  • the strand guide 55 is arranged downstream of the first mold 40 in the first operating state.
  • the strand guide 55 has a large number of driver stands 80 , 85 , 90 for guiding and driving both the first hot strand 70 and the second hot strand 260 .
  • the strand guide 55 can have one or more guide frames 91 .
  • the guide stand 91 is designed exclusively for holding and/or guiding the first hot strand 70 but not for driving the first hot strand 70 .
  • the continuous casting plant 10 is designed as a curved continuous casting plant. This means that, for example, the first hot strand 70 is guided out of the first mold 40 essentially in the direction of gravity or slightly inclined in the direction of gravity and the strand guide 55 bends the first hot strand 70 from the vertical to the horizontal in the first operating state.
  • the strand guide 55 has a first driver stand 80, a second driver stand 85 or an arrangement of a plurality of second driver stands 85 and a third driver stand 90.
  • the third driver framework 90 can also be dispensed with.
  • the guide stand 91 is arranged downstream of the mold outlet 60 in relation to the conveying direction 75 of the first hot strand 70 .
  • the first driver stand 80 is arranged upstream of the other driver stands 85 , 90 in relation to the conveying direction 75 of the first hot strand 70 .
  • the first driver stand 80 is arranged downstream of the guide stand 91 in relation to the conveying direction of the first hot strand 70 .
  • the second driver stand 85 is arranged downstream of the first driver stand 80 in the conveying direction 75 .
  • the strand guide 55 has an arrangement of a plurality of second driver stands 85 arranged one after the other, which can be configured essentially identically to one another.
  • the third driver stand 90 is arranged after the second driver stand 85 or the arrangement of the second driver stands 85 .
  • the arrangement of one or more second driver stands 85 is thus arranged between the first driver stand 80 on the side facing the mold 40, 45 and the third driver stand 90 on the side of the strand guide 55 facing away from the mold 40, 45.
  • Cooling nozzles 95 can be arranged between the driver frames 80 , 85 , 90 or integrated into the driver frames 80 , 85 , 90 . Cooling water is sprayed onto the first hot leg 70 with the aid of the cooling nozzles 95 in order to further cool the first hot leg 70 . As the distance between the first hot strand 70 and the mold outlet 60 increases, the first hot strand 70 hardens from the first shell 100 inwards towards the core of the first hot strand 70 . After passing through the strand guide 55, a shell thickness of the first shell 100 has increased compared to the first shell 100 at the mold outlet 60, preferably the first hot strand 70 at the end of the strand guide 55 has essentially solidified.
  • FIG. 2 shows a detail B, marked in FIG. 1, of the continuous casting installation 10 shown in FIG.
  • the first driver stand 80 has a first pair of rollers 105 .
  • the first pair of rollers 105 has a first roller 110 and a second roller 115 .
  • the first roller 110 can also be referred to as the first inner roller, for example, and is arranged on a side of the first driver frame 80 facing the mold 40 , 45 in relation to the mold 40 , 45 .
  • the second roller 115 is, for example, opposite to a perpendicular relative to the conveying direction 75 of the first hot strand 70 in the strand guide 55 arranged to the first roller 110 .
  • the second roller 115 can also be referred to as the first outer roller. In the first operating state, the first hot strand 70 is guided between the first roller 110 and the second roller 115 so that, for example, the first roller 110 is arranged on top and the second roller 115 is arranged on the underside of the first hot strand 70 .
  • the first driver stand 80 has a first adjusting device 120 .
  • the first adjusting device 120 is designed to move the first roller 110 between a first position and a second position.
  • a first distance ai between the first roller 110 and the second roller 115 is smaller in the first position than in the second position of the first roller 110 .
  • the first roller 110 and the second roller 115 are each driven and rotatable about an associated first and second axis of rotation 125, 130, respectively. It is also possible for only the first roller 110 or the second roller 115 to be driven. In particular, it is conceivable that the first roller 110 is driven and the second roller 115 is not driven. As a result, the first driver framework 80 is of particularly simple design.
  • the first axis of rotation 125 of the first roller 110 is aligned parallel to the second axis of rotation 130 of the second roller 115 .
  • the first axis of rotation 125 and second axis of rotation 130 are parallel to the y-axis and run in a direction perpendicular to the conveying direction 75 of the first hot strand 70 between the first roller 110 and the second roller 115 .
  • the first driver stand 80 can have a first measuring device 135, with the first measuring device 135 determining the first distance ai between the first roller 110 and the second roller 115.
  • the first measuring device 135 can be connected to a control device (not shown in FIG. 2) of the continuous casting installation 10 and can provide the control device with the determined first distance ai.
  • eight second driver stands 85 are arranged next to one another in relation to the conveying direction of the first hot strand 70 .
  • the second driver frames 85 are designed essentially identically to one another, so that in the following only the explanation of a second driver frame 85 is discussed. What was explained for the second driver stand 85 also applies correspondingly to the other second driver stands 85 .
  • the second driver stand 85 has a second adjusting device 140 and a second pair of rollers 141 made up of a third roller 145 and a fourth roller 150 .
  • the third roller 145 is rotatable about a third axis of rotation 155 and is driven.
  • the third roller 145 is essentially arranged at a distance in the conveying direction 75 next to the first roller 110 of the first driver stand 80 .
  • the third roller 145 can thus also be referred to as the second inner roller.
  • the fourth roller 150 is rotatably mounted about a fourth axis of rotation 160 and can be driven in addition to or as an alternative to the third roller 145 . It is of particular advantage if the third and fourth roller 145 , 150 or the third roller 145 are driven. As a result, the second driver framework 85 is of particularly simple design.
  • the third and fourth axes of rotation 155, 160 run parallel to one another and parallel to the y-axis.
  • the fourth roller 150 can also be referred to as the second outer roller.
  • the fourth roller 150 is essentially arranged at a distance in the conveying direction 75 next to the second roller 115 of the first driver stand 80 .
  • the third roller 145 is connected to the second adjustment device 140, the second adjustment device 140 being configured to adjust the third roller 145 between a third position and a fourth position, with a second position being in the third position Distance a2 between the third roller 145 and the fourth roller 150 is smaller or larger than in the fourth position of the third roller 145 .
  • the third driver framework 90 is designed essentially identically to the first driver framework 80 .
  • the third driver stand 90 has a third adjusting device 165 , a third pair of rollers 166 with a fifth roller 170 and a sixth roller 175 and preferably a second measuring device 190 .
  • the second measuring device 190 can also be dispensed with.
  • the fifth roller 170 is arranged on a side of the third driver stand 90 facing the mold 40 , 45 and can also be referred to as the third inner roller.
  • the fifth roller 170 can be driven and is mounted so that it can rotate about a fifth axis of rotation 180 .
  • the sixth roller 175 is arranged opposite the fifth roller 170 perpendicularly with respect to the conveying direction of the first hot strand 70 between the fifth and sixth rollers 170 , 175 .
  • the sixth roller 175 is arranged on a side facing away from the mold 40 , 45 and can also be referred to as the third outer roller.
  • the sixth roller 175 is rotatably mounted and can be driven about a sixth axis of rotation 185 .
  • the sixth roller 175 can be driven in addition to or as an alternative to the fifth roller 170 . Also, only the fifth roller 170 can be driven and the sixth roller 175 can be non-driven.
  • the fifth and sixth axes of rotation 180 , 185 run parallel to one another and parallel to the y-axis .
  • the third adjustment device 165 is connected to the fifth roller 170 and is designed to adjust the fifth roller 170 between a fifth position and a sixth position. In the fifth position, a third distance as between the fifth roller 170 and the sixth roller 175 is smaller than in the sixth position of the fifth roller 170 .
  • FIG. 3 shows a detail of a sectional view through the first driver frame 80 along a sectional plane CC shown in FIG.
  • the first roller 110 and the second roller 115 of the first pair of rollers 105 are preferably configured identically to one another.
  • the first roller 110 is explained below. What was explained for the first roller 110 also applies analogously to the second roll 115 .
  • the directional information used in the context of the explanation of the first roller 110 with regard to an axial direction and a radial direction each relate to the assigned first axis of rotation 125 of the first roller 110 .
  • the characteristics of the first roller 110 are transferred to the second roller 115, they are to be transferred to the second axis of rotation 130.
  • the first roller 110 and the second roller 115 each have a first running surface 195 on the circumference.
  • the first running surface 195 is related to the respectively assigned first axis of rotation 125 or related to the second axis of rotation 130 in the case of the second roller 115.
  • the first running surface 195 has a first section 200 , a second section 205 and a third section 210 .
  • the second section 205 directly adjoins the first section 200 in the axial direction with respect to the first axis of rotation 125 .
  • the third section 210 directly adjoins the second section 205 on an axial side facing away from the first section 200 .
  • the first running surface 195 is configured in a cylindrical manner surrounding the first axis of rotation 125 on the first roller 110 .
  • the first running surface 195 has a first outer diameter d 1 .
  • the first running surface 195 has a first indentation 215 .
  • the first indentation 215 has a concave shape and is arc-shaped, in particular part-circular.
  • the first indentation 215 extends completely over the second section 205 and connects the first section 200 to the third section 210 .
  • the first indentation 215 preferably has a first curvature R 1 .
  • the first curvature R 1 can be greater than half the first outer diameter di of the first section 200 .
  • the first indentation 215 is formed circumferentially around the first axis of rotation 125 .
  • the first indentation 215 extends radially inwards and has a minimum second outer diameter d 2 .
  • the third subsection 210 is formed in the same way as the first subsection 200 .
  • the first running surface 195 is configured in a cylindrical manner running around the first axis of rotation 125 and has a third outer diameter da.
  • the first outside diameter di is identical to the third outside diameter d 3 .
  • the first and second rollers 110, 115 are positioned in the axial direction relative to the first and second axis of rotation 125, 130 such that the second section 205 of the first roller 110 and the second partial section 205 of the second roller 115 are arranged completely overlapping one another in the axial direction.
  • An axial overlap means that when two components are projected in the radial direction into a plane in which the first axis of rotation 125 runs, the two components, for example the second section 205 of the first roller 110 and the second section 205 of the second roll 115, completely overlap and thus cover.
  • the sections 200, 205, 210 each have an associated axial width b 1, b2, b3. In the axial direction, based on the respective first or second axis of rotation 125, 130 at least the second section 205 has the same second axial width b2.
  • a first axial width bi of the first section 200 and a third axial width bi of the first and/or the third section 200 , 210 of the first and/or the second roller 110 , 115 can also be identical.
  • the first roller 110 and the second roller 115 are arranged opposite one another in the z-direction.
  • the first and second axes of rotation 125 , 130 are arranged in a plane perpendicular to the conveying direction 75 of the first hot strand 70 .
  • a first distance a 1 is based on a minimum distance of the first section 200 of the first roller 110 from the first section 200 of the second roller 115 .
  • FIG. 4 shows a detail of a sectional view through the second driver frame 85 along a sectional plane DD shown in FIG.
  • the third roller 145 and the fourth roller 150 of the second pair of rollers 141 are designed to be identical to one another in the embodiment, with the third roller 145 being explained below by way of example.
  • the statements made for the third roller 145 also apply correspondingly to the fourth roller 150 , with axial and radial directional information being related to the fourth axis of rotation 160 in each case when transferring from the third roller 145 to the fourth roller 150 .
  • the third roller 145 has a second running surface 220 , the second running surface 220 being configured to run around the third axis of rotation 155 .
  • the third running surface 225 is cylindrical in relation to the third axis of rotation 155 over its entire axial extent.
  • the third running surface 225 has a fourth outer diameter d4, it being possible for the fourth outer diameter d 4 to be different from the first to third outer diameters d 1 , d 2 , d 3 .
  • the third roller 145 and the fourth roller 150 are arranged at a second distance a2 from one another.
  • the second distance a2 is related to a distance between the second running surface 220 of the third roller 145 and the second running surface 220 of the fourth roller 150 .
  • the third axis of rotation 155 and the fourth axis of rotation 160 are arranged in a common plane, which is aligned perpendicular to the conveying direction 75 of the first hot strand 70 .
  • FIG. 5 shows a detail of a sectional view along a sectional plane E-E shown in FIG. 2 through the continuous casting plant 10 shown in FIG.
  • the third driver framework 90 is configured identically to the first driver framework 80 .
  • the third Driver frame 90 the third pair of rollers 166, wherein in the embodiment, for example, the fifth roller 170 can be identical to the first roller 110 and the sixth roller 175 can be identical to the second roller 115 .
  • the fifth roller 170 has, for example, a third running surface 225 with a fourth to sixth section 230, 235, 240, with the fifth section 235 being arranged axially in relation to the fifth axis of rotation 180 between the fourth and sixth sections 230, 240 is .
  • the third running surface 225 has a second indentation 245 in the fifth section 235, which is formed circumferentially around the fifth axis of rotation 180 on the third running surface 225.
  • the fourth and sixth partial section 230 , 240 can be formed in a cylindrical shape running around the fifth axis of rotation 180 .
  • the fifth section 235 connects the fourth section 230 to the sixth section 240 .
  • the second indentation 245 is concave, in particular arc-shaped, in the sectional view and has a second curvature R 2 .
  • An axial fourth width b4 of the fifth section 235 can correspond to the second axial width b2 of the second section 205.
  • the second curvature R 2 can also be selected to be identical to the first curvature R 1 .
  • the second curvature R 2 is smaller than the first curvature R 1 .
  • a third distance a 3 between the third pair of rollers 166 is related, for example, to a minimum distance of the third running surface 225 in the fourth section 230 of the fifth roller 170 to the fourth section 230 of the third running surface 225 of the sixth roller 175 .
  • FIG. 6 shows a flowchart of a method for operating the continuous casting plant 10 shown in FIGS. 1 to 5.
  • the first mold 40 is installed in the continuous casting installation 10 below the pouring tube 30 (cf. FIG. 1).
  • a second process step 310 (cf. FIG. 1) following the first process step 305, the distributor tank 25 is charged with the molten metal 65 and the plug 35 is opened so far that the molten metal 65 flows into the first mold 40, around the first to cast hot strand 70 .
  • the first hot strand 70 solidifies on the first mold 40 .
  • the first hot strand 70 leaves the first mold 40 via the mold outlet 60 .
  • the first hot strand can have a rectangular format with, for example, the dimensions of 20 cm x 30 cm up to and including 25 cm x 35 cm.
  • the first hot strand 70 is guided along the conveying direction 75 into the strand guide 55 .
  • the guide framework 91 holds the first hot strand 70 and prevents the first shell 100 from buckling. Furthermore, cooling water is sprayed onto the first hot strand 70 through the cooling nozzles 95 in order to promote solidification of the core arranged on the inside of the first shell 100 .
  • At least some of the rollers 110 , 115 , 145 , 150 , 170 , 175 are driven to convey the first hot strand 70 .
  • the first hot strand 70 is transported through the strand guide 55 along the conveying direction 75 by the rollers 110 , 115 , 145 , 150 , 170 , 175 that are pressed on.
  • the first hot strand 70 is guided through the guide stand 91 to the first driver stand 80 (cf. FIG. 3).
  • the first roller 110 rests on the first running surface 195 with the first section 200 and the third section 210 on a first side surface 250 of the first hot strip 70 .
  • the first running surface 195 is arranged at a distance from the first side surface 250 by the first indentation 215 .
  • the oppositely arranged second roller 115 of the first pair of rollers 105 is located in the first and third sections 200, 210 of the first running surface 195 on a second side surface 255 of the first hot strand 70 which is arranged opposite the first side surface 250 in the z-direction.
  • the first side surface 250 and the second side surface 255 are each formed by the oppositely arranged broad side panels 50 .
  • the first adjusting device 120 sets at least the first roller 110 to the second position.
  • the first adjustment device 120 provides a first pressing force F P 1 with which the first roller 110 is pressed against the first side surface 215 of the first hot strand 70 .
  • the second roller 115 provides a first counterforce F G1 which acts against the first pressing force F P 1 .
  • the first pressing force F P 1 is selected in such a way that an essentially linear contact of the first and third partial section 200, 210 on the respective side surface 250, 255 is ensured.
  • the first pressing force F P 1 is also chosen such that deformation of the first shell 100 by the first pair of rollers 105 is essentially prevented.
  • the first hot strand 70 is held and secured against slipping by means of the first pressing force F P 1 .
  • a third step 315 which can be carried out parallel to the second step 310, the first measuring device 135 determines the first distance a 1 between the first roller 110 and the second roller 115 and provides the determined first distance a 1 to the control unit.
  • a fourth method step 320 the first hot strand 70 is guided through the arrangement of second driver stands 85 (cf. FIG. 4).
  • the second adjusting device 140 in each case places the third roller 145 in the fourth position, so that the predefined second distance a 2 is set. If, as shown in FIGS. 1 and 2, several second driver stands 85 are provided, each of the second adjustment devices 140 sets the second distance a 2 between the associated second pair of rollers 141 such that with increasing running length of the first Hot strand 70 by arranging second driver stands 85, the second distance a 2 between the second pair of rollers 141 is reduced in each case compared to the second pair of rollers 141 arranged on the hot-rod upstream side.
  • the second adjusting device 140 provides a second pressing force F P2 on the third roller 145 , the second pressing force F P2 being significantly greater than the first pressing force F P 1 .
  • the first pressing force F P1 can be from 30 kN up to and including 70 kN, in particular from 30 kN up to and including 50 kN, preferably 30 kN, while the second pressing force F P2 can be, for example, from one finally 800 kN up to and including 1200 kN, in particular 1 . 000 kN.
  • the first pressing force F P 1 can be kept low, particularly when the first and second rollers 110, 115 are driven, and for example be closer to the lower interval limit mentioned than to the upper interval limit. As a result, the first driver frame 80 is mechanically exposed to lower loads.
  • a thickness d of the first hot strand 75, with which the first hot strand 70 is fed to the respective second driver stand 85, is greater than the second distance a 2 .
  • the fourth roller 150 provides a second opposing force F G2 directed against the second pressing force F P2 .
  • the thickness d of the first shell 100 on the second driver frame 85 is reduced by means of the second pressing force F P2 and the second counterforce F G2 .
  • the thickness d of the first hot strand 70 is successively reduced across the arrangement of second driver stands 85 .
  • a soft reduction is carried out, in which the core of the first hot strand 70 has not yet completely solidified and the thickness reduction can therefore take place particularly well before the first hot strand 70 is fed, for example, to a roughing train arranged downstream of the continuous casting plant 10 .
  • the third and fourth rollers 145 , 150 are driven, the second pressing force FP2 and the second counterforce FG2 are reduced compared to an embodiment of the second driver frame 85 without a drive for the second pair of rollers 141 .
  • a particularly simple and cost-effective strand guide 55 can thus be provided, particularly when carrying out the soft reduction.
  • a fifth method step 325 the first hot strand 70 is guided through the third driver stand 90 (cf. FIG. 5).
  • the fifth roller 170 is in the sixth position and is in contact with the fourth and sixth sections 230 , 240 against the first side surface 250 .
  • the third running surface 225 of the sixth roller 175 rests on the underside of the second side surface 255 of the soft-reduced first hot strand 70 with the fourth and sixth sections 230 , 240 .
  • the third adjusting device 165 presses the fifth roller 170 with a third pressing force F P3 in the sixth position pressed against the first side surface 250 of the first hot bar 70 .
  • the third pressing force F P3 is significantly smaller than the second pressing force F P2 .
  • the sixth roller 175 provides a third opposing force F G3 TO the third pressing force F P3 directed against the third pressing force F P3 .
  • the third pressing force F P3 can be from 30 kN up to and including 70 kN, in particular 50 kN.
  • the third pressing force F P3 is selected in such a way that the first shell 100 of the first hot strand 70 is essentially not deformed.
  • the first hot strand 70 is held and secured against slipping by means of the third pressing force F P3 .
  • the third distance as is smaller than the first distance a 1 and corresponds to a final thickness d E of the first hot strand 70 at the end of the strand guide 55 .
  • the second measuring device 190 determines the third distance as and provides the information about the third distance as to the control unit.
  • the control unit can If the determined first distance a 1 and third distance a 3 and a predefined desired end thickness of the first hot strand 70 were at the end of the strand guide 55, the second distance a 2 of the second pair of rollers 141 would be determined and the second adjusting device 140 based on the determined second Control distance a 2 so that the second pair of rollers 141 is arranged in the determined second distance a 2 .
  • control unit can regulate the strand guide 55 for the soft reduction in such a way that the final thickness d E at the end of the strand guide 55 on the first hot strand 70 corresponds to the desired final thickness of the first hot strand 70 with particular precision.
  • a sixth method step 330 the continuous casting of the first hot strand 70 is completed, so that the plug 35 closes the shroud 30.
  • the first mold 40 runs empty and the first hot strand 70 is guided out of the continuous casting plant 10 by the strand guide 55 .
  • a seventh method step 335 following the sixth method step 330 the continuous casting installation 10 is switched from the first operating state to the second operating state and the first mold 40 is replaced by the second mold 45 .
  • FIG. 7 shows a sectional view along the section plane CC shown in FIG. 2 through the continuous casting plant 10 shown in FIG. 1 in the second operating state.
  • FIG. 8 shows a sectional view along the section plane D-D shown in FIG. 2 through the continuous casting plant 10 shown in FIG. 1 in the second operating state.
  • 9 shows a sectional view along the sectional plane E-E shown in FIG. 2 through the continuous casting plant 10 shown in FIG. 1 in the second operating state.
  • the metallic melt 65 is conveyed from the ladle 15 into the distributor basin 25 . Furthermore, the stopper 35 is opened so that the metallic melt 65 is conducted into the second mold 45 via the pouring tube 30 . at the contact surface, the metallic melt 65 solidifies in the second mold 45 to form a second hot strand 260 and forms a second shell 265 which has an elliptical cross section, preferably a circular cross section. A maximum radial extension e of the second hot strand 2 60 is preferably smaller than the thickness d of the first hot strand 70 at the mold outlet 60 .
  • the second shell 265 can be designed to be significantly stiffer and more robust in relation to the second hot bar 260 than in the first hot bar 70 . This ensures that flattening of the second hot strand 260 is kept to a minimum by the guide stand 91 .
  • the first roller 110 is moved into the first position by the first adjusting device 120, so that compared to the previous method steps 305 to 330 the first roller 110 is arranged at a smaller first distance a 1 from the second roller 115 than during the casting of the rectangular first hot billet 70 .
  • the third roller 145 is moved into the third position by the second adjusting device 140, so that the second distance a 2 is reduced or increased compared to the first to seventh method steps 305 to 335.
  • the fifth roller 170 is moved into the fifth position by the third adjusting device 165, so that the third distance a 3 is reduced compared to the first to sixth method steps 305 to 330.
  • a ninth method step 345 the first roller 110 is pressed by the first adjusting device 110 against the second hot strand 260 with a fourth pressing force F P4 .
  • the second roller 115 provides a fourth counterforce F G4 directed against the fourth pressing force F P4 , the fourth pressing force F P4 being higher than the first pressing force F P1 .
  • the fourth pressing force F P4 can be 40 kN to 80 kN, in particular 50 kN.
  • the first and third sections 200, 210 are spaced apart from the second hot bar 260, while the second hot bar 260 in the second section 205 rests against the first running surface 195 on the circumference.
  • the first curvature R 1 of the first indentation 215 is selected such that the first curvature R 1 is greater by a factor of 1.2 to 1.6 than an outer curvature RA of the outer peripheral side 270 of the second hot strand 260 .
  • the second hot leg 260 can, for example, have an outer curvature of 7 cm up to and including 13 cm, so that a diameter of the second hot leg 260 is from 14 cm up to and including 26 cm.
  • the second hot strand 260 has a particularly small deviation from a desired cross-sectional shape.
  • the second hot strand 260 shown in FIG. 7 has a particularly small tolerance to a circular shape.
  • the second hot strand 260 is also held and secured against slipping by means of the fourth pressing force F P4 .
  • the second hot strand 260 After passing through the first driver stand 85, the second hot strand 260 is guided through the second driver stand 85 (cf. FIG. 8).
  • the fourth position of the third roller 145 is selected such that the second distance a 2 is greater than a maximum radial extension e of the second hot strand 260 .
  • the second hot strand 260 rests only with its mass on the fourth roller 150 and the third roller 145 is not pressed against the second hot strand 260, so that flattening of the top and/or bottom of the second hot strand 260 is prevented or kept to a minimum will .
  • the third roller 145 exclusively prevents the second hot strand 260 from bulging upwards in that the second hot strand 260 strikes the top side of the second running surface 220 during buckling and is thus guided within the arrangement of the second driver stands 85 in the direction of the third driver stand 90 .
  • the second hot strand 260 is guided through the third driver stand 90 (cf. FIG. 9).
  • the fifth roller 170 is in the fifth position and is pressed against the outer peripheral side 270 of the second hot strip 260 in the fifth section 235 with a fifth pressing force F P5 .
  • the sixth roller 175 provides a fifth counterforce F G5 in the opposite direction to the fifth pressing force F P5 and rests with the fifth partial section 235 on the outer peripheral side 270 of the second hot strand 260 .
  • the fifth pressing force F P5 can be significantly greater than the third pressing force F P3 .
  • the fifth pressing force F P5 can be from 50 kN up to and including 100 kN, in particular 70 kN.
  • the third distance a 3 can be slightly smaller than the first distance a 1 .
  • the third distance a 3 can also be identical to the first distance a 1 .
  • the second indentation 245 of the fifth and sixth rollers 170, 175 can use the fifth pressing force F P5 and the fifth counterforce F G5 to flatten the second roller pair 141 from the second hot strand (for example by resting on the fourth roller 150).
  • 260 are rolled, so that after passing through the third driver stand 90, the second hot rod 260 is particularly precise with respect to the geometric shape of the outer peripheral side 270. In particular, the outer peripheral side 270 has a particularly good round shape.
  • the second hot strand 260 is also held and secured against slipping by means of the fifth pressing force F P5 .
  • the second hot strand 260 can be used, for example, to produce high-precision tubes.
  • the hot second hot strand 260 can be fed directly to the forming machine or the second hot strand can be cut off into billets.
  • the configuration of the continuous casting plant 10 described above and the method for operating the continuous casting plant 10 has the advantage that both the rectangular first hot strand 70 for sheet metal production and billet material for tube production can be cast by means of the continuous casting installation 10 .
  • the final thickness dE of the first hot strand 70 after passing through the strand guide 55 can be determined particularly well by measuring after passing through the second driver stand 85 on the third driver stand 90 and the second adjusting device 140 can thereby be controlled by the control unit. This eliminates the need for additional measuring rollers.
  • the profiling of the first and second rollers 110, 115 of the first driver stand 80 and the fifth and sixth rollers 170, 175 of the third driver stand 90 can ensure centering of the second hot strand 260 as it passes through the strand guide 55.
  • drifting of the second hot strand 260 in the strand guide 55 is avoided.
  • the second measuring device 190 to be dispensed with and for the fifth roller 170 to be arranged in the sixth position at a distance from the first hot strand 70 in the first to sixth method steps 305 to 330 .
  • the first hot strand 70 rests on the sixth roller 175 only on the second side surface 255 in the fourth and sixth sections 230, 240 of the sixth roller 175, with the sixth roller 175 den first hot strand 70 is supported at the bottom. Due to the arrangement at a distance from the first hot strand 70 , the fifth roller 170 does not assume any further function.
  • the strand guide 55 is of particularly simple design. reference character list

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

Abstract

L'invention concerne une machine de coulée continue (10) pour couler en alternance un premier brin chaud (70) ayant une section transversale rectangulaire et un second brin chaud (260) ayant une section transversale circulaire à partir d'une masse fondue métallique (65) et un procédé de fonctionnement de la machine de coulée continue (10). La machine de coulée continue a un guide de brin (55) ayant au moins un premier support d'entraînement (80) et un second support d'entraînement (85) disposé en aval dans la direction d'acheminement (75) du premier brin chaud (70). Le premier support d'entraînement (80) a une première paire de rouleaux (105) ayant un premier rouleau (110) et un deuxième rouleau (115) et le second support d'entraînement (85) a une seconde paire de rouleaux (141) ayant un troisième rouleau (145) et un quatrième rouleau (150). Le premier rouleau (110) et le deuxième rouleau (115) ont chacun, sur le côté circonférentiel, une première surface de déplacement (195), qui est dans chaque cas conçue de manière cylindrique dans une première section partielle (200). Le premier rouleau (110) et le second rouleau (115) ont chacun, dans une seconde section partielle (205) de la première surface de déplacement (195) adjacente à la première section partielle, un premier évidement (215) formé de manière circonférentielle sur la première surface de déplacement (195). Le troisième rouleau (145) et le quatrième rouleau (150) ont chacun une seconde surface de déplacement cylindrique (220). La première section partielle (200) est conçue pour guider le premier brin chaud (70) et le premier évidement (215) est conçu pour guider le second brin chaud (260).
EP21773306.2A 2020-09-18 2021-09-01 Machine de coulée continue et procédé de fonctionnement de la machine de coulée continue Pending EP4214006A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50798/2020A AT524482B1 (de) 2020-09-18 2020-09-18 Stranggießanlage und Verfahren zum Betrieb der Stranggießanlage
PCT/EP2021/074162 WO2022058168A1 (fr) 2020-09-18 2021-09-01 Machine de coulée continue et procédé de fonctionnement de la machine de coulée continue

Publications (1)

Publication Number Publication Date
EP4214006A1 true EP4214006A1 (fr) 2023-07-26

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Application Number Title Priority Date Filing Date
EP21773306.2A Pending EP4214006A1 (fr) 2020-09-18 2021-09-01 Machine de coulée continue et procédé de fonctionnement de la machine de coulée continue

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EP (1) EP4214006A1 (fr)
AT (1) AT524482B1 (fr)
WO (1) WO2022058168A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU812420A1 (ru) * 1979-03-23 1981-03-17 Центральный Научно-Исследователь-Ский Институт Черной Металлургии Им.И.П.Бардина Направл ющее устройство зоныВТОРичНОгО ОХлАждЕНи уСТАНОВКиНЕпРЕРыВНОй РАзлиВКи МЕТАллА
IT1262116B (it) * 1993-05-17 1996-06-19 Danieli Off Mecc Procedimento di prelaminazione controllata per bramme sottili uscenti da colata continua e dispositivo relativo
IT1267298B1 (it) * 1994-09-30 1997-01-28 Danieli Off Mecc Dispositivo di colata continua per prodotti a sezione tonda ed a sezione a lati piani
DE19639299C2 (de) * 1996-09-25 2001-02-22 Sms Demag Ag Vorrichtung zur Herstellung eines Vielkant- oder Profil-Formats in einer Stranggießanlage
US7806164B2 (en) * 2007-04-26 2010-10-05 Nucor Corporation Method and system for tracking and positioning continuous cast slabs
EP3135402B1 (fr) * 2015-08-27 2018-07-25 Primetals Technologies Austria GmbH Lingotiere et procede destine a la surveillance d'une lingotiere

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AT524482B1 (de) 2022-07-15
AT524482A1 (de) 2022-06-15

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