EP3025799B2 - Installation de laminage - Google Patents

Installation de laminage Download PDF

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Publication number
EP3025799B2
EP3025799B2 EP14195442.0A EP14195442A EP3025799B2 EP 3025799 B2 EP3025799 B2 EP 3025799B2 EP 14195442 A EP14195442 A EP 14195442A EP 3025799 B2 EP3025799 B2 EP 3025799B2
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EP
European Patent Office
Prior art keywords
field inductor
metal strip
inductor
longitudinal
longitudinal field
Prior art date
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EP14195442.0A
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German (de)
English (en)
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EP3025799A1 (fr
EP3025799B1 (fr
Inventor
Jürgen Seidel
Volker Kunze
Markus LANGEJÜRGEN
Andreas Piehlk
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SMS Group GmbH
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SMS Group GmbH
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Application filed by SMS Group GmbH filed Critical SMS Group GmbH
Priority to EP14195442.0A priority Critical patent/EP3025799B2/fr
Priority to PCT/EP2015/077616 priority patent/WO2016083439A1/fr
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Publication of EP3025799B1 publication Critical patent/EP3025799B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill

Definitions

  • the invention relates to a rolling mill with at least a first and a second roll stand, at least one inductor arranged between the first and the second roll stand for heating a metal strip moved by the inductor, the inductor being an upper induction coil which is arranged above the metal strip to be heated and a lower induction coil, which is arranged below the metal strip to be heated and opposite to the upper induction coil.
  • the rolling mill comprises an energy supply device for supplying the upper and the lower induction coil with electrical energy.
  • the invention relates to a casting and rolling system with a casting machine for producing the metal strip and a rolling system according to the invention downstream of the casting machine in the material flow direction.
  • the invention also relates to a method for producing a metal strip.
  • Inductors for heating metal strip are basically known in the prior art, for. B. from the GB 770 548 , of the JP 022 07 481 , of the JP 06122928 , of the JP 2000-252050 , of the JP 2004 306069-71 , of the WO 2010 036987 A2 and the WO 2014 021596 , the cited documents describing more distant prior art.
  • JP 4172122 discloses vertically adjustable inductor halves which are moved vertically when a ski is detected on the head of a metal strip with the aid of a camera in order to avoid a collision of the metal strip with the inductor.
  • the upper and lower induction coils are moved vertically according to a measured tape position.
  • the said Japanese application only speaks of an inductor, without distinguishing between cross-field or longitudinal field inductors.
  • the US 5,495,094 discloses inductor loops with a 180 ° phase shift, which in this respect represent a longitudinal field inductor.
  • the inductor loops can each be adjusted independently of one another perpendicular to a stationary workpiece to be heated.
  • EP 2 416 900 B1 The use of longitudinal and transverse field inductors in a rolling mill is disclosed in EP 2 416 900 B1 .
  • the WO 2012 045585 A2 discloses a laterally open cross-field inductor for entering or leaving the line of a metal strip in a rolling mill.
  • the EP 0 721 813A1 discloses a C-shaped inductor between two adjacent mill stands in a finishing train.
  • Cross-field inductors are primarily used for heating thin strips with thicknesses ⁇ 12 mm, while longitudinal field inductors are used for heating thicker strips with thicknesses> 6 mm, for example.
  • there is a transition range in the practical use of the two types of induction heating please refer EP 2 416 900 B1 .
  • Figure 9 shows the construction and mode of operation of a known cross-field inductor 180. It comprises an upper cross-field induction coil 182, which is assigned to the top of the metal strip 200.
  • the cross-field inductor comprises a lower cross-field induction coil 184, which is assigned to the underside of the metal strip 200.
  • the opening cross sections of the upper and lower transverse field inductor coils lie opposite one another and in each case parallel to the metal strip 200.
  • the magnetic field lines generated during operation of the inductor are shown in FIG Figure 9 also represented symbolically.
  • the upper and the lower cross-field inductor coils 182, 184 can each be moved, ie adjusted, independently of one another perpendicular to the plane of the metal strip 200.
  • the magnetic field or the magnetic flux acts primarily perpendicular to the plane of the metal strip.
  • the divided arrangement of the coils advantageously enables the two induction coils, ie in the case of both inductor halves, to be adjusted independently of one another perpendicular to the plane of the metal strip and that the inductor can be designed to be open on the side. In the event of a fault, the distance between the coils and the metal strip can therefore be slightly increased and / or the inductor can be moved out of the line of the metal strip.
  • Figure 8 shows an example of a known longitudinal field inductor, which is typically designed as a closed frame.
  • the metal strip to be heated therefore runs through a closed rectangular gap when it passes the known longitudinal field inductor.
  • the longitudinal field inductor essentially generates a magnetic field in the transport direction of the metal strip to be heated.
  • transverse and longitudinal field inductors are also from the WO 2014 021596 known.
  • the Japanese patent application JP 61195708 discloses a cross-field inductor with coils opposite the top and bottom of a metal strip to evenly heat the metal strip.
  • the part of the inductor assigned to the upper side of the metal strip and the part of the inductor assigned to the underside of the metal strip are each assigned moving devices in order to move the respective parts of the inductor perpendicular to the surface of the metal strip as a function of detected unevenness or curvatures in the metal strip perpendicular to its surface to proceed.
  • the European patent application EP 2 340 897 A1 discloses a rolling mill with a roughing stand and at least one stand of a finishing mill and with a longitudinal field inductor arranged between the two stands for heating the metal strip moved by the longitudinal field inductor.
  • the longitudinal field inductor has an upper induction coil, which is assigned above the metal strip to be heated, and a lower induction coil, which is arranged below the metal strip to be heated, opposite the upper induction coil.
  • the EP 2 340 897 A1 also an energy supply device for supplying the induction coils of the longitudinal field inductor with electrical energy.
  • the preamble of claims 1 and 14 is based on the WO2014 / 135710A1 .
  • the invention has for its object to develop a known rolling mill and a known casting-rolling plant for producing a metal strip such that in particular thicker metal strip with thicknesses> 6 mm, for example, is heated and rolled particularly effectively, ie using as little electrical energy as possible .
  • the main advantage of the invention of a new induction heater for a rolling mill, in particular a hot strip mill, is to combine the advantages of the above-described inductor types, namely the possibility of placing the upper or lower inductor coils and the efficient heating of thicker strips or slabs.
  • the adjustability of the divided longitudinal field inductors makes sense for thickness variations of ⁇ H ⁇ 6 mm or particularly preferably of ⁇ H ⁇ 15 mm.
  • the roughing strip between the roughing stand and the first rolling stand of the finishing train loses temperature particularly quickly.
  • the "waiting" end of the strip cools down because it has to linger longer before the finishing mill or is simply colder. This requires higher rolling forces in the finishing mill when rolling the strip end.
  • the provision according to the invention of an induction heater in the form of an inductor advantageously makes it possible to raise the temperature level at the end of the strip, but also over the entire length of the strip, as far as necessary.
  • a distance of less than 60 mm, preferably less than 20 mm, in each case of an induction coil from the metal strip is sought.
  • a minimum distance of 15 mm has been shown to be advantageous.
  • induction coil and “induction coil” are used interchangeably in the description.
  • the energy supply device has upper capacitors which are connected to the upper induction coil to form an upper partial resonant circuit, and the energy supply device has lower capacitors which are connected to the lower induction coil to form a lower partial resonant circuit.
  • the upper longitudinal field inductor traversing device is then designed to move the upper partial resonant circuit perpendicular to the top of the metal strip and / or the lower longitudinal field inductor traversing device is then designed to move the lower partial resonant circuit perpendicular to the underside of the metal strip.
  • the inductor's upper and lower inductors with antiphase electrical currents allows the inductor, i. H. the longitudinal field inductor can be made C-shaped. This advantageously also enables the transverse movement of the longitudinal field inductor into and out of the line of the metal strip.
  • the possibility of moving out of the line of the metal strip is particularly advantageous in the event of a malfunction in the rolling mill or if there is a shaft in the metal strip or if there is a ski on the head of the metal strip.
  • the upper and the lower induction coil can each be formed from a single turn or from a plurality of partial turns connected in parallel and preferably crosswise.
  • the provision of a single turn is often chosen at high frequencies.
  • a fall ie a crossover connection of the windings.
  • This technology known from electric motor technology, ensures that an external partial conductor is arranged in the outgoing conductor and on the inside in the return conductor. Through this crosswise connection, the current load of the parallel conductor. Since the conductors must cross at the winding overhangs, these should be designed with particularly little stray field.
  • the same partial inductances are also achieved by the cross-connection.
  • the energy supply device is advantageously designed to operate the induction coils and the partial resonant circuits - depending on the thickness of the metal strip - with current or voltage frequencies between 2 kHz and 30 kHz. The frequency increases as the band thickness decreases.
  • the number of partial turns per induction coil is between 3 and 15, depending on the frequency. The greater the number of partial turns, the finer the distribution of the current. But the complexity of the inductor also increases with a larger number of partial turns.
  • the inductor windings are typically covered with laminated cores made of laminated, layered electrical sheets to reduce the stray field. This measure is useful and necessary because the upper and lower induction coils are installed in close proximity to other rolling mill components. Since the other rolling mill components are almost exclusively made of ferrous materials, no stray field may emerge from the induction coils of the longitudinal field or transverse field inductors and the other rolling mill components may also heat up.
  • At least one transverse field inductor can also be provided in the rolling mill, which can then be operated in addition to the at least one longitudinal field inductor.
  • the cross-field inductors not only is the strip center to be heated, but at the same time the strip edges are heated up to efficiently produce a uniform strip temperature across the finished strip width.
  • An upper cross-field inductor coil or an upper cross-field inductor partial resonant circuit and a lower cross-field inductor coil or a lower cross-field inductor partial resonant circuit of the cross-field inductor are then likewise perpendicular to the plane spanned by the metal strip and / or transverse to the longitudinal direction of the metal strip, with the aid of associated cross-field inductor displacement devices .
  • the upper and lower transverse field inductor traversing device and / or the upper and / or lower longitudinal field inductor traversing device are controlled by a control device.
  • a temperature measuring device is provided for detecting the distribution of the temperature of the metal strip over its width, and the control device is designed to control the upper and / or lower longitudinal field inductor displacement device so that the longitudinal field inductor positions in response to the measured temperature distribution can be that the difference between the measured temperature distribution and a predetermined target temperature distribution across the width of the metal strip behind the finishing mill is minimal.
  • Several longitudinal field or transverse field inductors can preferably be arranged distributed over the length of the system.
  • a sensor device for detecting an irregularity in the metal strip, such as a ski on the head of the metal strip, a shaft or an arc in the metal strip, or another disturbance in the rolling process.
  • the control device is designed to control the upper and / or lower longitudinal field inductor displacement device in such a way that the distance of the induction coils from the top or the bottom of the metal strip is suitably changed in the area of the irregularity and / or the inductors from the line of the Metal strip can be moved out.
  • At least one touch sensor can be provided for detecting a contact of the longitudinal field inductor and / or transverse field inductor by the metal strip.
  • the control device is designed to control the moving devices in such a way that the longitudinal field inductor and / or the transverse field inductor is opened in the thickness direction and / or is moved laterally out of the line of the metal strip.
  • the thicknesses change with which the metal strip from the casting plant enters an oven or the at least one roughing stand of the rolling plant.
  • the thickness of the metal strip also changes within the rolling mill behind a roughing stand or between the individual rolling stands on a finishing mill.
  • the claimed longitudinal field and cross-field inductors can be optimally adjusted to the individual thickness of the metal strip at the points mentioned. Because the inductors, in particular the longitudinal field inductors, are each C-shaped or laterally open, they can also be used well with larger tolerances with regard to the lateral course of the metal strip.
  • a furnace can be connected between the casting machine and the rolling train, and advantageously a further longitudinal field inductor and / or the transverse field inductor can then advantageously be connected between the furnace and the roughing stand for further heating.
  • the arrangement of the further is particularly advantageous Longitudinal field inductor between the furnace and the at least one roughing stand, also the arrangement of the longitudinal field inductor between the roughing stand and the first stand of the finishing rolling mill and the arrangement of a transverse field inductor between individual stands of the finishing rolling mill.
  • the use of split, adjustable induction coils of the longitudinal field inductor is particularly suitable for thicknesses of the metal strip> 6 mm, because in this thickness range the non-closed longitudinal field inductor according to the invention offers better efficiency than the transverse field inductor and / or the closed longitudinal field inductor designed with a frame structure.
  • the adjustable, adjustable longitudinal field inductor according to the invention is preferably used at a strip temperature range of> 750 ° C. It is particularly suitable for continuous rolling (see definition below) or also for conventional rolling of flat products in a hot strip mill.
  • the distance d of the inductor surface from the metal strip i.e. H.
  • the distance between the side or surface of the induction coil facing the metal strip and the metal strip is, as said, preferably less than 20 mm during active operation of the longitudinal field inductor.
  • the safety distance between the induction coils and the metal strip can be more than 100 mm, in exceptional cases even more than 500 mm.
  • the split, adjustable longitudinal and transverse field inductors are preferably used in an endless casting and rolling process.
  • the casting installation and the rolling installation are connected via the casting strand. Both systems are then coupled and work with the same mass flow.
  • This process has to be started at some point and then an induction heater consisting of divided inductors (top, bottom), which can be turned on and is open at the side, is particularly advantageous.
  • This design is also advantageous in the start-up and unthreading process or in a fault situation.
  • adjustable inductors is preferably used in continuous strip casting processes in particular between two finishing stands, which have a stand spacing of 5 m to ⁇ 40 m and which are operated in endless mode.
  • a process model is used to control the start-up and removal strategy in the continuous strip casting process, which controls the settlement of the roll stands and activation of the inductors.
  • the strip areas of different strip temperatures are also tracked by the rolling mill and the effect of the temperature differences on the stand loading and stand setting is taken into account. That is, the cold strip head is set to a higher strip thickness or the decreases are limited and so z. B. also kept the scaffolding load within permissible limits.
  • Figure 1 shows an exemplary embodiment of the rolling mill 400 according to the invention. It comprises a roughing stand 420 and a finishing mill 440 downstream of the roughing stand in the material flow direction with the finishing stands F1-F N. In the material flow direction R, the rolling mill 400 comprises a cooling device 450 and a reel device 460 behind the finishing mill 440.
  • a longitudinal field inductor 170 designed according to the invention is arranged between the roughing stand 420 and the first rolling stand F1 of the finishing mill 440.
  • cross-field inductors 180 or further longitudinal field inductors 170 can be arranged in front of the finishing mill and / or between individual stands of the finishing mill 440.
  • Figure 2 illustrates the mode of operation of the longitudinal field inductor 170: Without the presence of the longitudinal field inductor 170, the temperature of the metal strip in z. B. the conventional rolling mill according to the solid line in Figure 2 before entering the first stand F1 of the finishing mill 440, drop sharply from the strip head to the strip end. This would result in the disadvantages mentioned in the general part of the description.
  • the longitudinal field inductor according to the invention between the roughing stand 420 and the first stand F1 of the finishing mill 440 advantageously has the effect that the temperature of the metal strip 200 from the strip head to the end of the strip can be kept constant at a high level, as shown in FIG Figure 2 is indicated by the horizontal dashed line.
  • the belt head can run out of the roughing stand with a ski. According to the prior art, this is eliminated or reduced before the induction heating with a roller straightening machine. If this does not succeed and a ski is still detected, the strap is retracted and pushed off. This is a disadvantage.
  • a split, adjustable longitudinal field inductor whose opening width can be increased (lifting the upper inductor and / or lowering the lower inductor) can ensure safe transport through the induction heating section, primarily at the head.
  • the inductor spacing is increased depending on whether a ski or ribbon bow is detected or whether a rolling fault occurs or generally without a ribbon shape detection.
  • the inductor can then be closed again and the pre-strip heated.
  • a roller straightening machine or other measures in front of a divided, adjustable longitudinal field induction heating can thus be dispensed with if the inductor gap is enlarged on each strip head which is not to be heated and is heated.
  • Figure 3 shows the construction of the longitudinal field inductor 100, 170 according to the invention. It comprises an upper induction coil 110, which is arranged above the metal strip 200 to be heated, and a lower induction coil 120, which is arranged below the metal strip to be heated, opposite the upper induction coil 110.
  • the two induction coils 110, 120 are supplied by a power supply device 130 with electrical energy, more precisely with electrical currents in opposite phases. Due to this operation of the upper and lower induction coils with opposite phase currents, the inductor 100 acts as a longitudinal field inductor 170.
  • the in Figure 3 described design of the longitudinal field inductor the advantage that the upper induction coil 110 and the lower induction coil 120 are independently vertically displaceable, so that the distance of the upper induction coil to the top of the metal strip 200 and the distance of the lower induction coil 120 to the bottom of the metal strip 200 individually in the desired Way and depending on the thickness of the metal strip 200 can be adjusted.
  • Figure 4 illustrates that an upper capacitor 115 is typically assigned to the upper induction coil 110, the upper induction coil and the upper capacitor 115 being connected to form an upper partial resonant circuit.
  • the lower induction coil is connected to an associated capacitor 125 to form a lower resonant circuit.
  • An upper longitudinal field inductor travel device 140 is assigned to the upper partial oscillating circuit for moving the upper partial oscillating circuit or at least the upper coil 110 perpendicular to the plane formed by the metal strip 200.
  • a lower longitudinal field inductor moving device 150 is assigned to the lower partial oscillating circuit for moving the lower partial oscillating circuit or at least the lower induction coil 120 perpendicular to the plane spanned by the metal strip 200.
  • the upper and lower induction coils 110, 120 of the longitudinal field inductor 100, 170 or their housing are, as in FIG Figure 4 shown, C-shaped for transverse movement of the inductor with the aid of the inductor carriage 142 or a similar transverse movement mechanism into or out of the line of the metal strip 200.
  • the line corresponds to the material flow direction R, which in Figure 4 is directed into or out of the plane of the drawing.
  • the rolling mill 400 can have a transverse field inductor 180 in addition to the at least one longitudinal field inductor 100, 170 between the roughing stand 120 and the first stand F1 of the finishing mill 440.
  • the cross-field inductor is in a known manner as in the prior art above with reference to FIG Figure 9 described, trained.
  • the arrangement described above with reference to the longitudinal field inductor 100, 170 according to FIG Figure 4 applies equally to the cross-field inductor 180.
  • the cross-field inductor 180 comprises an upper cross-field inductor coil 182 assigned to the top of the metal strip 200 and a lower cross-field inductor coil 184 assigned to the underside of the metal strip 200.
  • Capacitors 115, 125 can also be assigned to the cross-field inductor coils 182, 184 Form partial resonant circuits together with the inductor coils.
  • An upper cross-field inductor travel device 186 is provided for moving the upper cross-field inductor coil 182 or the upper cross-field inductor partial resonant circuit perpendicular to the plane spanned by the metal strip.
  • a lower cross-field inductor travel device 188 is provided for moving the lower cross-field inductor coil 184 or the lower cross-field inductor partial resonant circuit, likewise perpendicular to the plane spanned by the metal strip.
  • the upper and lower transverse field inductor traversing devices 186, 188 and / or the upper and lower longitudinal field inductor traversing devices 140, 150 can form a structural unit.
  • This structural unit is preferably assigned an inductor carriage 142 for moving the longitudinal field inductor and / or the transverse field inductor transversely to the longitudinal direction of the metal strip from the line of the metal strip or into the line of the metal strip 200.
  • the cross-field inductor travel devices 186, 188 and / or the longitudinal field inductor travel devices 140, 150 or the inductor carriage 142 are controlled by a control device 187; please refer Figure 4 .
  • Figure 5 shows a plan view of the metal strip 200.
  • a temperature measuring device 190 and possibly 550 for detecting the distribution of the temperature over its width can be seen.
  • the temperature measuring device 190 is preferably arranged behind the last rolling stand F N of the finishing mill 440.
  • the measured temperature distribution is fed as an input variable to the control device 187, so that in response to the temperature distribution the upper and / or the lower longitudinal field inductor displacement device 140, 150 and / or the upper and / or the lower transverse field inductor displacement device 186, 188 and / or suitably controls the inductor carriage 142.
  • the properties of the finished product can be optimally adjusted across the width.
  • the input temperature distribution 550 is also optionally taken into account.
  • a sensor device 195 can be provided for detecting an irregularity in the metal band 200, such as a ski. B. on the head of the metal strip, a shaft or an arc in the metal strip or other disruption of the rolling process.
  • the sensor device 187 is then designed to control the longitudinal field inductor moving devices 140, 150 and / or the transverse field inductor moving devices 186, 188 or the inductor carriage 142 such that the distance d between the inductor coils is suitably changed from the top / bottom of the metal strip in the area of the irregularity and / or the inductors are moved out of the line of the metal strip.
  • At least one touch sensor 198 can be provided, e.g. B. in the form of a motion sensor or an accelerometer for detecting a touch of the longitudinal field inductor 170 and / or the transverse field inductor 180 by the metal strip 200.
  • the control device 187 is then designed in response to a signal from the touch sensor, which represents the eventual touch, to control the Longitudinal field inductor moving devices 140, 150 and / or the transverse field inductor moving devices 186, 188 and / or the inductor carriage 142 such that the longitudinal field inductor 100, 170 and / or the transverse field inductor 180 opens in the thickness direction when touching the metal strip 200 and / or laterally from the Line is pulled out.
  • Figure 6 shows the casting and rolling plant 500 according to the invention. It comprises a casting machine 300 for producing the metal strip 200 as well as the previously described rolling plant 400 downstream of the casting machine 300 in the material flow direction R. According to a first embodiment, there is a furnace between the casting machine 300 and the rolling train 400 350 switched. As already described above, the rolling mill 400 has a longitudinal field inductor 170 and / or transverse field inductor 180 between the at least one roughing stand 420 and the first stand F1 of the finishing rolling mill 440.
  • a further longitudinal field inductor 170 and / or the transverse field inductor 180 can be connected between the furnace 350 and the at least one roughing stand 420.
  • the further longitudinal field inductor 170 can also be connected between the furnace 350 and the roughing stand, and the transverse field inductor 180 can be connected between individual ones of the finishing stands of the finishing rolling mill.
  • Figure 7 illustrates the preferred field of application of the divided longitudinal field inductor according to the invention without a frame structure, ie with an upper and lower induction coil which can be adjusted individually perpendicular to the plane of the metal strip.
  • the dashed lines show the course of the electrical efficiency for a longitudinal field inductor with a closed inductor frame, the upper and lower induction coils of which cannot be adapted to the respective thickness ratios of the metal strip.
  • the dash-dotted line shows the course of the efficiency for a transverse field inductor and the two solid lines show the course of the electrical efficiency depending on the strip thickness for a longitudinal field inductor with advantageously individually adjustable upper and / or lower induction coil depending on the strip thickness.
  • Both the dashed lines for the closed longitudinal field inductor and the solid lines for the longitudinal field inductor, which can be set in a split manner, are each indicated for two different frequencies f j f i , f m and f n , the different frequencies being chosen optimally with regard to the band thickness application areas become.
  • the diagram illustrates according to Figure 7 that the electrical efficiency is particularly high when using cross-field inductors (dash-dotted line) for strip thicknesses ⁇ 6 mm.
  • the efficiency is particularly large when using longitudinal field inductors, it then doesn't matter whether split adjustable longitudinal field inductors or closed longitudinal field inductors are used.
  • the invention relates to a method for producing a metal strip with a rolling installation 400 according to the invention or a casting-rolling installation 500 according to the invention.
  • the rolling installation and the casting-rolling installation each comprise at least one longitudinal field inductor 170 and optionally additionally at least one transverse field inductor 180
  • the method provides that the distance d between the upper and lower adjustable inductor coils of the longitudinal field inductor or the transverse field inductor is adjusted to a suitable operating distance d ⁇ 60 mm depending on the respective thickness of the metal strip during the rolling of the fillet of the metal strip 200.
  • This operating distance is preferably kept constant at a distance of d ⁇ 20 mm during the rolling of the fillet.
  • a minimum distance of 15 mm has been shown to be advantageous.
  • the upper and / or the lower adjustable inductor coil of the longitudinal field inductor and possibly also that of the transverse field inductor are either moved to a predefined safety distance during the threading process of the head of the metal strip into a roll stand or are moved outside the strip line.
  • the induction coils only become synonymous after completion of the threading process with inductor coils, set to the appropriate operating distance. Only when the desired operating distance d to the metal strip is reached or comes close to it, are the inductors 100, 170, 180 activated, that is to say supplied with electrical energy.
  • the energy supply device 130 according to the invention is designed to supply all electronic components, ie in particular the induction coils and the displacement devices and the inductor carriage, with electrical energy.
  • the upper and lower induction coils 110, 120, 184, 186 of the longitudinal field inductor 170 and / or the transverse field inductor 180 are again raised to the predefined safety distance, e.g. B. shortly before the end of the metal strip 200 leaves a roll stand in front of the respective longitudinal field inductor or transverse field inductor or when a previously existing strip tension is broken down or when a roll accident has happened or in another disturbance of the mass flow.
  • the induction coils can also be moved out of the line of the metal strip.
  • the casting and rolling plant is preferably operated in an endless mode and / or in a semi-endless mode.
  • endless mode A definition of "endless mode” is given above in the general part of the description.
  • the term "semi-endless mode” means casting a long slab that can be stored in the furnace 350, and then rolling and separating the strips in front of the reel into a few coils.
  • e.g. B. 5 connected slabs successively rolled one after the other (similar to endless) and only shared with scissors behind the finishing train and z. B. 5 individual coils.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • General Induction Heating (AREA)

Claims (16)

  1. Laminoir (400) comprenant au moins une première cage de laminoir (420) sous la forme d'une cage dégrossisseuse et une deuxième cage de laminoir sous la forme d'une première cage de laminoir constituée par un certain nombre de cages de laminoir d'un train finisseur ;
    au moins un inducteur à champ longitudinal (100, 170) disposé entre la première et la deuxième cage de laminoir, destiné au réchauffement d'une bande métallique (200) qui est mise en mouvement sous l'influence de l'inducteur ; dans lequel l'inducteur à champ longitudinal présente une bobine d'induction supérieure (110), qui est disposée au-dessus de la bande métallique (200) qui doit être réchauffée, et une bobine d'induction inférieure (120) qui est disposée en dessous de la bande métallique qui doit être réchauffée, à l'opposé de la bobine d'induction supérieure ; et dans lequel l'inducteur à champ longitudinal est réalisé en plusieurs parties et est ouvert en direction latérale ;
    un mécanisme de déplacement supérieur (140) de l'inducteur à champ longitudinal destiné au déplacement de la bobine d'induction supérieure (110) perpendiculairement au côté supérieur de la bande métallique (200) et/ou un mécanisme de déplacement inférieur (150) de l'inducteur à champ longitudinal destiné au déplacement de la bobine d'induction inférieure (120) perpendiculairement au côté inférieur de la bande métallique (200) ;
    un mécanisme de commande (187) destiné à la commande des mécanismes de déplacement supérieur et/ou inférieur (140, 150) de l'inducteur à champ longitudinal ; et
    un mécanisme d'alimentation en énergie (130) destiné à l'alimentation des bobines d'induction supérieure et inférieure de l'inducteur à champ longitudinal (100, 170) avec de l'énergie électrique d'une manière telle qu'elles sont entraînées avec des courants électriques en opposition de phases ;
    caractérisé
    en ce que la distance (d) entre la bobine d'induction supérieure (110) et le côté supérieur de la bande métallique et/ou la distance (d) entre la bobine d'induction inférieure (120) et le côté inférieur de la bande métallique, dans une position de travail, est égal à d < 60 mm, de préférence s'élève à d < 20 mm ;
    en ce que l'on prévoit un mécanisme de mesure de la température (190) pour l'enregistrement de la distribution de la température de la bande métallique sur la largeur de cette dernière ;
    en ce que le mécanisme de mesure de la température est disposé de manière préférentielle derrière la dernière cage de laminoir du train finisseur ; et
    en ce que le mécanisme de commande (187) est réalisé pour la commande des mécanismes de déplacement supérieur et/ou inférieur de l'inducteur à champ longitudinal (140, 150) d'une manière telle que l'inducteur à champ longitudinal (100) ou un inducteur supplémentaire à champ longitudinal (170) peut venir se positionner en réponse à la distribution mesurée de la température, d'une manière telle que la différence entre la distribution mesurée de la température et une distribution de consigne prédéfinie de la température est minimale sur la largeur de la bande métallique ;
    en ce que l'on prévoit un mécanisme de détection (195) pour la détection d'une irrégularité dans la bande métallique, telle que le relèvement de la tête de la bande métallique à la manière d'un ski, une ondulation ou un arc dans la bande métallique, ou d'une autre perturbation du processus de laminage ; et
    en ce que le mécanisme de commande (187) est réalisé pour la commande des mécanismes de déplacement supérieur et/ou inférieur de l'inducteur à champ longitudinal (140, 150) d'une manière telle que la distance (d) entre les bobines d'induction et le côté supérieur/le côté inférieur de la bande métallique subit une modification appropriée dans la zone de l'irrégularité et/ou de manière telle que les inducteurs sont soumis à un déplacement et quittent la ligne de la bande métallique.
  2. Laminoir (400) selon la revendication 1, caractérisé en ce que le mécanisme d'alimentation en énergie (130) présente des condensateurs supérieurs (115) qui sont raccordés à la bobine d'induction supérieure (110) pour former un circuit oscillant partiel supérieur, et présente des condensateurs inférieurs (125) qui sont raccordés à la bobine d'induction inférieure (120) pour former un circuit oscillant partiel inférieur ; et
    en ce que le mécanisme de déplacement supérieur de l'inducteur à champ longitudinal (140) est réalisé pour le déplacement du circuit oscillant partiel supérieur perpendiculairement au côté supérieur de la bande métallique et/ou en ce que le mécanisme de déplacement inférieur de l'inducteur à champ longitudinal (150) est réalisé pour le déplacement de la bobine d'induction inférieure (120) perpendiculairement au côté inférieur de la bande métallique (200).
  3. Laminoir (400) selon l'une quelconque des revendications précédentes, caractérisé en ce que les bobines d'induction supérieure et inférieure (110, 120) de l'inducteur à champ longitudinal (100) ou leurs boîtiers sont réalisés en forme de C pour le déplacement transversal de l'inducteur à champ longitudinal jusque dans la ligne de la bande métallique (200) et à l'extérieur de celle-ci.
  4. Laminoir (400) selon l'une quelconque des revendications précédentes, caractérisé en ce que les bobines d'induction supérieure et inférieure (110, 120) sont formées respectivement à partir d'un enroulement individuel ou bien à partir d'une multitude d'enroulements partiels montés en parallèle et de préférence en croix.
  5. Laminoir selon la revendication 2, caractérisé en ce que le mécanisme d'alimentation en énergie (130) est réalisé pour l'entraînement des bobines d'induction (110, 120) et des circuits oscillants partiels - en fonction de l'épaisseur de la bande métallique-avec des fréquences de courant ou de tension entre 2 kHz et 30 kHz.
  6. Laminoir selon la revendication 4 ou 5, caractérisé en ce que le nombre des enroulements partiels par bobine d'induction - en se référant à la fréquence - s'élève entre 3 et 15.
  7. Laminoir (400) selon l'une quelconque des revendications précédentes, caractérisé par au moins un inducteur à champ transversal (180) qui peut être exploité dans le laminoir en plus dudit au moins un inducteur à champ longitudinal.
  8. Laminoir (400) selon la revendication 7, caractérisé en ce que l'inducteur à champ transversal (180) présente un circuit oscillant partiel supérieur d'inducteur à champ transversal attribué au côté supérieur de la bande métallique, comprenant un condensateur (115) et une bobine d'induction de champ transversal (182) et un circuit oscillant partiel inférieur d'inducteur à champ transversal attribué au côté inférieur de la bande métallique, comprenant un condensateur (125) et une bobine d'induction de champ transversal (184) ; et en ce que l'on prévoit un mécanisme de déplacement supérieur de l'inducteur à champ transversal (186) destiné au déplacement du circuit oscillant partiel supérieur de l'inducteur à champ transversal et un mécanisme de déplacement inférieur de l'inducteur à champ transversal (188) destiné au déplacement du circuit oscillant partiel inférieur de l'inducteur à champ transversal, respectivement en position perpendiculaire par rapport au plan sur lequel s'étend la bande métallique (200).
  9. Laminoir (400) selon la revendication 8, caractérisé en ce que les mécanismes de déplacement supérieur et inférieur de l'inducteur à champ transversal (186, 188) et/ou les mécanismes de déplacement supérieur et inférieur de l'inducteur à champ longitudinal (140, 150) sont réalisés en une seule pièce pour former une unité de construction.
  10. Laminoir (400) selon la revendication 9, caractérisé en ce que l'unité de construction présente un chariot d'inducteur (142) destiné au déplacement de l'inducteur à champ longitudinal et/ou de l'inducteur à champ transversal en direction transversale par rapport à la direction longitudinale de la bande métallique à l'extérieur de la ligne ou jusque dans la ligne de la bande métallique (200).
  11. Laminoir (400) selon la revendication 10, caractérisé en ce que l'on prévoit un mécanisme de commande (187) destiné à la commande des mécanismes de déplacement supérieur et inférieur de l'inducteur à champ transversal (186, 188) ou du chariot d'inducteur (142).
  12. Laminoir (400) selon la revendication 11, caractérisé en ce que l'on prévoit au moins un capteur de contact (198), par exemple sous la forme d'un capteur du mouvement ou sous la forme d'un indicateur d'accélération, destiné à la détection d'une mise en contact de l'inducteur à champ longitudinal (170) et/ou de l'inducteur à champ transversal (180) avec la bande métallique (200) ; et le mécanisme de commande (187) est réalisé pour la commande des mécanismes de déplacement supérieur et inférieur de l'inducteur à champ longitudinal (140, 150) et/ou des mécanismes de déplacement supérieur et inférieur de l'inducteur à champ transversal (186, 188) et/ou du chariot d'inducteur (142), d'une manière telle que l'inducteur à champ longitudinal (100) et/ou l'inducteur à champ transversal (180), dans le cas d'une mise en contact avec la bande métallique (200), s'ouvre dans la direction de l'épaisseur et/ou quitte la ligne en direction latérale.
  13. Laminoir (400) selon l'une quelconque des revendications précédentes 7 à 12, caractérisé en ce qu'un inducteur supplémentaire à champ longitudinal (170) et/ou l'inducteur à champ transversal (180) est/sont monté(s) entre des cages individuelles de laminoir du train finisseur.
  14. Installation de coulée-laminage (500) comprenant une machine de coulée (300) pour la production d'une bande métallique (200), caractérisée par un laminoir (400) selon l'une quelconque des revendications 1 à 13, montée à la suite de la machine de coulée dans la direction d'écoulement de la matière.
  15. Installation de coulée-laminage (500) selon la revendication 14, caractérisée en ce qu'un four (350) est monté entre la machine de coulée (300) et le train de laminoir (400) ; et en ce qu'au moins un inducteur supplémentaire à champ longitudinal (170) et/ou au moins un inducteur à champ transversal (180) est/sont monté(s) entre le four (350) et la cage dégrossisseuse (420).
  16. Installation de coulée-laminage (500) selon la revendication 15, caractérisée en ce que ledit au moins un inducteur supplémentaire divisé à champ longitudinal (170) apte à venir se placer dans la direction de l'épaisseur de la bande métallique est monté entre le four (350) et la cage dégrossisseuse et ledit au moins un inducteur à champ transversal (180) est monté entre des cages individuelles de laminoir du train finisseur (440-n).
EP14195442.0A 2014-11-28 2014-11-28 Installation de laminage Active EP3025799B2 (fr)

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PCT/EP2015/077616 WO2016083439A1 (fr) 2014-11-28 2015-11-25 Laminoir, installation de laminage de coulée continue et procédé de production d'une bande métallique

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WO2018138038A1 (fr) * 2017-01-24 2018-08-02 Primetals Technologies Austria GmbH Installation de laminage direct et procédé de traitement d'une pièce à l'aide d'une telle installation
US20220086962A1 (en) * 2019-01-14 2022-03-17 Primetals Technologies Austria GmbH Device for the inductive heating of a workpiece in a rolling mill
AT522035A1 (de) * 2019-01-14 2020-07-15 Primetals Technologies Austria GmbH Vorrichtung zur induktiven Erwärmung eines Werkstücks in einer Walzanlage
AT522345B1 (de) * 2019-03-29 2020-11-15 Primetals Technologies Austria GmbH Heizungsvorrichtung zum induktiven Erhitzen eines Flachstahlstreifens in einem Warmwalzwerk
DE102019008622A1 (de) * 2019-12-13 2021-06-17 ABP lnduction Systems GmbH Querfeldinduktionsheizeinrichtung
CN115210054B (zh) * 2020-01-27 2024-01-30 百德福钢带有限公司 用于加热和干燥至少一个由非铁磁材料制成的产品的设备
EP4015099A1 (fr) 2020-12-15 2022-06-22 Primetals Technologies Austria GmbH Fabrication efficace en énergie d'un feuillard à chaud ferritique dans une installation composite de coulée et de laminage
CN118023294A (zh) * 2022-11-11 2024-05-14 达涅利机械设备股份公司 用于改造生产扁平轧制产品的设备的方法

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