EP2855047A1 - VERFAHREN ZUM BETRIEB EINES TRANSPORTBANDES EINER BANDGIEßANLAGE SOWIE BANDGIEßANLAGE - Google Patents
VERFAHREN ZUM BETRIEB EINES TRANSPORTBANDES EINER BANDGIEßANLAGE SOWIE BANDGIEßANLAGEInfo
- Publication number
- EP2855047A1 EP2855047A1 EP13722768.2A EP13722768A EP2855047A1 EP 2855047 A1 EP2855047 A1 EP 2855047A1 EP 13722768 A EP13722768 A EP 13722768A EP 2855047 A1 EP2855047 A1 EP 2855047A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- conveyor belt
- strip
- deformations
- casting
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
- B22D11/0671—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating for heating or drying
Definitions
- the present invention relates to a method for operating a conveyor belt of a strip casting plant, and a strip casting plant for casting metals.
- Such a method and a corresponding continuous casting apparatus is known for example from EP 326 788 A1, according to which the two conveyor belts or mold belts are unwound from a bundle and are wound up again after use on a bundle.
- the band is stretched while passing through the casting chamber to counteract thermally induced deformations of the mold belt.
- the strip casting process typically leads to a deformation of the conveyor belt, which results inter alia from the fact that, when the liquid metal is applied to the respective conveyor belt while the cooling capacity is high, the liquid metal is in flutter contact with the conveyor belt Conveyor belt occurs.
- Flutter contact means here that the liquid metal strip rapidly solidifies on contact with the strongly cooled conveyor belt and accordingly forms a first casting skin towards the conveyor belt. Due to the thermal contraction of the casting skin, which is associated with a detachment of the casting skin from the conveyor belt, the casting skin loses the intense cooling, which is caused by the direct contact with the cooled conveyor belt, and then melts again by the liquid metal located behind the skin immediately , It comes accordingly to re-contact between the liquid metal and the conveyor belt.
- a method is also known from DE 41 36 542 A1, in which a circulating conveyor belt is heated before being exposed to the metallic melt in order to counteract a deformation of the conveyor belt.
- the proposed method or devices are used accordingly to heat a conveyor belt before the casting process or during the casting so targeted that a deformation of the conveyor belt is counteracted.
- the method for operating a conveyor belt of a strip casting plant comprises the steps of performing a profile measurement of the Conveyor belt to detect the position and / or extent of deformations of the conveyor belt, and the selective heating of the conveyor belt in the region of the detected deformations in order to reduce and / or eliminate the deformation by subsequent thermal contraction.
- the profile measurement of the conveyor belt and the corresponding detection of the position and extent of deformations can be correspondingly located in the conveyor belt after a casting dents, which are caused by a flow of the material of the conveyor belt, detected and their relative position to the conveyor belt and their extent be recorded.
- the subsequent step of selectively heating the respective deformations that is to say in particular the detected bumps, the respective deformation can then be reduced by the corresponding subsequent thermal contraction during the cooling of the previously strongly heated selective regions of the conveyor belt or pulled completely out of the belt.
- the profile measurement is advantageously carried out in a distance method, it being possible to detect here whether bulges are present in the conveyor belt and at which position of the conveyor belt these bulges are present with which extent.
- the profile measurement can also be determined with two opposing distance measurements by means of a difference method, or it can by means of a laser scanning or measuring curtains with a certain width a corresponding profile measurement can be performed.
- Other non-contact distance measuring methods such as radar or ultrasound, may also be used for profile measurement. Accordingly, in this way, coupled with the respective tape position, the extent and the position of deformations and in particular of bumps in the conveyor belt determined.
- bulge is meant here a deformation which stands out from a surrounding, substantially flat surface.
- a bump is in particular no distortion of the conveyor belt.
- calculation methods of bi-cubic splines for determining the position, depth and extent of the respective deformations and in particular the bumps can be used in the measuring process.
- the selective heating of the detected deformations is preferably carried out via a selective loading of the conveyor belt with a magnetic field via induction coils, wherein the eddy currents produced in the conveyor belt correspondingly ensure a selective heating of the conveyor belt. In this way, the respective deformations in the conveyor belt can be reduced or completely pulled out of the subsequent thermal contraction.
- the induction is preferably applied via an array of induction coils on the conveyor belt, which is arranged in a free region of the conveyor belt.
- the array of induction coils is preferably controlled such that precisely those regions of the conveyor belt in which the deformation was detected are selectively heated. This is independent of whether it is circular bumps or elongated bumps. Elongated bulges, which do not extend in the strip running direction, can also be selectively and selectively heated via a corresponding control of the coil array.
- a selective heating is applied by a chronological sequence of at least two voltage pulses or current pulse bursts and / or a temporal sequence of the control of at least two different induction coils.
- the time sequence of the voltage pulses, current pulse bursts or the activation of the different induction coils is determined on the basis of the determined bulge shape, preferably the bump shape determined via the bi-cubic splines, such that a targeted heating of the transport belt takes place in the region of the determined bulge.
- the selective heating of the conveyor belt and possibly also the profile measurement is carried out in a region of the conveyor belt which has a higher strip tension or a smaller strip tension in relation to the casting area.
- the pulling out of bumps can be positively influenced or even smaller bumps can be detected by means of a smaller strip tension.
- a strip casting plant for casting flat metal strips is provided with at least one circulating conveyor belt, wherein at least one measuring device is provided for profile measurement of the conveyor belt to to detect the position and / or extent of deformations of the conveyor belt, and at least one heating device for selectively heating the conveyor belt in the region of the detected deformation is provided.
- the measuring device allows a profile measurement of the conveyor belt such that deformations can be detected, for example for the detection of dents in the conveyor belt, which originate from a previous casting operation.
- the measuring device makes it possible to determine the tape position, ie the position of the respective deformation on the conveyor belt, as well as the extent of the respective deformation, for example the diameter or the shape of a bulge, and their depth.
- the region in which the respective deformation was detected in the conveyor belt can then be selectively heated.
- the selective heating is preferably controlled via a corresponding control device so that the respective deformation is pulled out of the conveyor belt by means of a thermal contraction during the cooling process following the heating.
- the introduced heat energy or the temperature of the heating to be achieved in the conveyor belt for example, also be controlled depending on the extent of the respective deformation or the depth of the respective deformation, such that the most accurate and effective reduction or removal of the respective deformation of the conveyor belt allows becomes.
- this is also possible in the method described above. In this way it can be achieved that the conveyor belt before subsequent casting again provides a completely flat surface on soft then the metal melt can be abandoned.
- the measuring device via a distance measuring method and to design the measuring device accordingly such that the Distance measurement can be performed.
- This can be done, for example, optically, for example by laser, radar and ultrasound.
- the Profi I jazz takes place preferably by means of a measuring device which can perform a height measurement over the entire width of the conveyor belt away. From this height profile in combination with the respective band position then the (three-dimensional) band profile can be determined.
- the selective heating of the conveyor belt in the areas in which the deformations were detected is achieved via an array of induction coils, which are arranged in a free region of the conveyor belt, ie preferably outside the casting area.
- the profile measurement must be carried out in front of the array of induction coils in order to be able to control the array of induction coils from the data determined by the profile measurement so that selective heating of the conveyor belt takes place only in the areas in which the deformations were detected.
- the array of induction coils is preferably formed in a plurality of mutually displaced lines so that each area of the conveyor belt across the width of the conveyor belt can be applied selectively selectively with thermal energy.
- the respective induction coils are preferably air coils or coils with special ferrite sintered cores which are suitable for high frequencies. In this way, it is achieved that the conveyor belt can be acted upon selectively, not only in the transverse direction, but also in the conveying direction with the corresponding heat energy, without a corresponding delay or a high energy loss takes place.
- the induction coils may have diameters between 10 and 30 cm and be arranged correspondingly next to each other in rows slightly offset from one another over the entire width of the conveyor belt.
- a set of tensioning devices preferably two S-rollers, are provided, by means of which a section of the conveyor belt lying between these two tensioning devices either with a higher tension than the tension applied in the casting area or with a lower tension than the applied in the casting area train can be acted upon.
- the heating device and particularly preferably also the measuring device is preferably arranged in order to be able to measure the conveyor belt with respect to its profile, even with different tractions, and to be able to apply heat energy selectively. To pull out bumps from the conveyor belt high tension is conducive. To measure even small bumps in the conveyor belt low tension is conducive. According to the setting of the respective S-rollers in the arranged between the S-rollers area a corresponding Zugregime can be adjusted.
- Show Figure 1 is a schematic side view of a portion of a strip casting according to a first embodiment
- Figure 2 is a schematic side view of a section of a
- FIG. 3 shows a schematic circuit arrangement for a heating device
- Figure 4 shows a schematic arrangement for a circuit of a
- Heating device in a further embodiment
- Figure 5 is a schematic plan view of an induction coil array in a first state
- FIG. 6 shows a further schematic plan view of an induction coil array in a second state
- Figure 7 is a schematic side view of a portion of a
- FIG. 8 shows a further schematic side view of that shown in FIG
- Section of the strip casting plant in a state of charge Section of the strip casting plant in a state of charge.
- FIG. 1 shows a schematic side view of a section of a strip casting plant 1 for casting a flat metal strip 2, wherein a feed system 20 is provided, via which the molten metal is applied to a conveyor belt 3.
- the conveyor belt 3 is a circulating, that is endless conveyor belt, which is circumferentially guided over two upper rollers 30, 32 and a tension roller 34.
- the molten metal is fed via the feeding system 20 onto the conveyor belt 3 to form the flat metal strip 2.
- a spray water cooling box 36 which effectively cools the conveyor belt 3 from below by means of a corresponding water supply.
- cooling capacities of about 7 to 8 MW / m 2 are achieved in the region in which the molten metal is fed to the conveyor belt 3 via the feed system 20.
- the spray water cooling box 36 further provides a negative pressure, by means of which the conveyor belt 3 can be guided largely flat to provide a flat support surface for the molten metal.
- a measuring device 4 is provided for determining these deformations, by means of which the position of the respective deformation and its extent can be detected.
- the respective position of the respective deformation on the conveyor belt 3, as well as their extent, that is, for example, the diameter, the longitudinal extent and / or the depth or height, are on the Passing measuring device 4 to a central, not shown evaluation and control device.
- the measuring device 4 can be a non-contact measuring device, for example via a meander-shaped scanning process by means of a laser, through measuring curtains across the width of the conveyor belt 3, through radar or ultrasound or via imaging methods.
- the heating device 5 preferably consists of an array of induction coils, which applies the heating energy in exactly the areas on the conveyor belt 3, in which the measuring device 4 has previously detected the corresponding deformations. Accordingly, the measuring device 4, viewed in the direction of tape travel, is arranged in front of the heating device 5.
- heating device 5 A possible embodiment of the heating device 5 will be described below, for example, with reference to Figures 3 to 6.
- FIG. 2 shows a variant of the measuring method shown in FIG. 1 in the strip casting plant 1, the measuring device 4 here having a second measuring device 42 opposite the first measuring device 40, which conveys the conveyor belt 3 with respect to both from the top side and from the underside measure the respective deformations.
- an exact value for the respective deformation and in particular for the respective bulge present in the conveyor belt 3 can then be calculated from the respective measured data of the upper and lower measuring device 40, 42.
- the provision of the differential measuring method via the measuring devices 40, 42 arranged on opposite sides of the conveyor belt 3 can substantially eliminate artifacts which occur, for example, due to belt vibrations, so that only the deformations inherent in the belt can be measured via this measuring device.
- the induction coils 5 and the array of induction coils 5 are then controlled again so that heat is selectively introduced into the conveyor belt 3 at the positions at which a deformation has been determined via the measuring device 40, 42.
- Figure 3 shows a schematic circuit arrangement for driving an induction coil from the array 5 of induction coils.
- a single induction coil 50 is then acted upon via a power switch 60, for example an inverter, with a corresponding current pulse when a selective or local heating of the conveyor belt 3 is to be achieved.
- a power switch 60 for example an inverter
- the power switch 60 is preceded by a capacitor group or a standard battery 62, which serves for the intermediate storage or for buffering the current requirement of the induction coil 50.
- the capacitor group or standard battery 62 are continuously charged via a corresponding constant current source 64, the energy is then retrieved only via the power switch 60, when in fact a deformation of the conveyor belt 3 in the region of the corresponding, connected to the circuit breaker 60 induction coil 50 has been detected.
- FIG. 4 shows, in an alternative, a switching device which allows the induction coil 50 via the corresponding power switch 60 not a single voltage pulse, as shown in FIG. 3, but a current pulse burst, correspondingly a very high heating of the conveyor belt in a very short period of time to allow a very small space area.
- the conveyor belt 3 is shown schematically, which has bumps of different sizes.
- the bumps are provided with the reference numeral 340.
- the bumps for example, as shown in Figure 6, may also be elongated bumps which extend in different directions.
- a heating device 5 in the form of an array of different induction coils 50 is provided under the conveyor belt 3, which has the bulges from the previous casting process.
- the induction coils are, as seen in the tape running direction, arranged in rows, which are slightly offset from each other.
- four rows of induction coils 50 are shown, which extend substantially over the entire width of the conveyor belt 3 away, and which are each offset by a sixth of the coil width.
- each point on the conveyor belt 3 selectively and very selectively apply thermal energy.
- a corresponding sequence for loading the individual induction coils 50 of the array 5 is shown, at least for the bulges 340 shown on the left in FIG. 5, in such a way that heating energy can be applied to the respective bulges and accordingly
- the bumps 340 are pulled out of the band 3 via thermal contraction.
- the individual inductors 50 may be provided either as air coils or as coils with a sintered ferrite core. In this way, the coils with the very high frequencies during selective, rapid switching on and off of the respective current, for example, by the single current pulse or the current pulse burst to follow.
- the respective sequences for controlling the individual induction coils 50 of the heating device 5 result from the energy to be introduced into the conveyor belt 3. Accordingly, for example, the same position of the conveyor belt 3 with two or more induction coils can be acted upon in succession with a larger deformation and a higher energy requirement.
- the order of activation results from the evaluation of the measured bulge shapes by bi-cubic splines such that a targeted heating of the conveyor belt 3 can take place in the region of the determined bulge.
- FIG. 7 shows a further schematic side view of a strip casting installation 1 for casting a flat metal strip 2 in a further, alternative embodiment.
- a supply system 20 is provided for charging the conveyor belt 3 with the molten metal to form the flat metal strip 2.
- a spray water cooling box 36 which also provides a negative pressure, is provided below the conveyor belt 3, in turn, a spray water cooling box 36, which also provides a negative pressure, is provided below the conveyor belt 3, in turn, a spray water cooling box 36, which also provides a negative pressure, is provided.
- the conveyor belt 3 is guided in the free area 310 via two pairs of rollers S, 72, which allow the region 700 of the conveyor belt 3 located between the two roller pairs to be subjected to a different tension than that present in the pouring area 300 Train of the conveyor belt 3.
- a lesser train can be adjusted, for example, to be able to detect small deviations and slight deformations of the conveyor belt 3 via the measuring device 4 ,
- a higher tension is set in the area 700 of the conveyor belt 3 lying between the two S-rollers 70, 72 than in the casting area 300, in order to extract deformations in the area 700 located between the two S-rollers 70, 72 to support from the conveyor belt 3 by the higher strip tension.
- FIG. 8 shows the strip casting installation 1 from FIG. 7 in a further state in which the two pairs of S-rolls 70, 72 are arranged in a loading position, ie are rotated relative to one another in relation to the position shown in FIG. 7, in order to insert a new one To facilitate conveyor belt 3.
- the tension roller 34 compensates for the corresponding difference in length of the conveyor belt 3.
- Both the heating device 5 and the measuring device 4 are so far out of the way or moved that the conveyor belt 3 can be used in the corresponding guides.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012010791 | 2012-06-01 | ||
| DE102012223004A DE102012223004A1 (de) | 2012-06-01 | 2012-12-13 | Verfahren zum Betrieb eines Transportbandes einer Bandgießanlage sowie Bandgießanlage |
| PCT/EP2013/060142 WO2013178478A1 (de) | 2012-06-01 | 2013-05-16 | VERFAHREN ZUM BETRIEB EINES TRANSPORTBANDES EINER BANDGIEßANLAGE SOWIE BANDGIEßANLAGE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2855047A1 true EP2855047A1 (de) | 2015-04-08 |
| EP2855047B1 EP2855047B1 (de) | 2019-04-10 |
Family
ID=49579537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13722768.2A Active EP2855047B1 (de) | 2012-06-01 | 2013-05-16 | VERFAHREN ZUM BETRIEB EINES TRANSPORTBANDES EINER BANDGIEßANLAGE SOWIE BANDGIEßANLAGE |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2855047B1 (de) |
| DE (1) | DE102012223004A1 (de) |
| WO (1) | WO2013178478A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2030306B1 (en) * | 2021-12-27 | 2023-07-03 | Trivium Packaging Group Netherlands B V | System for servicing a metal transfer belt |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3937270A (en) * | 1973-11-09 | 1976-02-10 | Hazelett Strip-Casting Corporation | Twin-belt continuous casting method providing control of the temperature operating conditions at the casting belts |
| AU607226B2 (en) | 1987-06-08 | 1991-02-28 | Mitsubishi Heavy Industries, Ltd. | Twin belt type continuous casting |
| EP0326788B1 (de) | 1988-01-28 | 1991-03-06 | Larex Ag | Verfahren und Stranggiessvorrichtung mit mindestens einem wandernden Kokillenband für die Herstellung von Metallbändern und -strängen |
| US5133402A (en) | 1990-11-09 | 1992-07-28 | Ajax Magnethermic Corporation | Induction heating of endless belts in a continuous caster |
| JPH09192789A (ja) * | 1996-01-19 | 1997-07-29 | Kobe Steel Ltd | ベルト式連続鋳造方法 |
-
2012
- 2012-12-13 DE DE102012223004A patent/DE102012223004A1/de not_active Withdrawn
-
2013
- 2013-05-16 EP EP13722768.2A patent/EP2855047B1/de active Active
- 2013-05-16 WO PCT/EP2013/060142 patent/WO2013178478A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2013178478A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2855047B1 (de) | 2019-04-10 |
| DE102012223004A1 (de) | 2013-12-05 |
| WO2013178478A1 (de) | 2013-12-05 |
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