EP3504352B1 - Method and apparatus for coating a metal sheet - Google Patents
Method and apparatus for coating a metal sheet Download PDFInfo
- Publication number
- EP3504352B1 EP3504352B1 EP17754711.4A EP17754711A EP3504352B1 EP 3504352 B1 EP3504352 B1 EP 3504352B1 EP 17754711 A EP17754711 A EP 17754711A EP 3504352 B1 EP3504352 B1 EP 3504352B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- magnets
- shape
- magnet
- actual
- 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.)
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- 239000002184 metal Substances 0.000 title claims description 50
- 229910052751 metal Inorganic materials 0.000 title claims description 50
- 239000011248 coating agent Substances 0.000 title claims description 44
- 238000000576 coating method Methods 0.000 title claims description 38
- 238000000034 method Methods 0.000 title claims description 34
- 230000006641 stabilisation Effects 0.000 claims description 28
- 238000011105 stabilization Methods 0.000 claims description 28
- IHQKEDIOMGYHEB-UHFFFAOYSA-M sodium dimethylarsinate Chemical class [Na+].C[As](C)([O-])=O IHQKEDIOMGYHEB-UHFFFAOYSA-M 0.000 claims description 10
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 7
- 229910052725 zinc Inorganic materials 0.000 claims description 7
- 239000011701 zinc Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000005452 bending Methods 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
- C23C2/0034—Details related to elements immersed in bath
- C23C2/00342—Moving elements, e.g. pumps or mixers
- C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/50—Controlling or regulating the coating processes
- C23C2/51—Computer-controlled implementation
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/50—Controlling or regulating the coating processes
- C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/50—Controlling or regulating the coating processes
- C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing
- C23C2/524—Position of the substrate
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/50—Controlling or regulating the coating processes
- C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing
- C23C2/524—Position of the substrate
- C23C2/5245—Position of the substrate for reducing vibrations of the substrate
Definitions
- the invention relates to a method for coating a metal strip with the aid of a coating device.
- the belt first passes through a coating container with a liquid coating agent, e.g. B. zinc, and subsequently a stripping nozzle device for stripping excess zinc from the surface of the metal strip.
- a coating container with a liquid coating agent, e.g. B. zinc
- a stripping nozzle device for stripping excess zinc from the surface of the metal strip.
- the belt typically passes through a belt stabilization device with a plurality of magnets on both broad sides of the belt.
- the zinc layer thicknesses vary both over the length and over the width of the strip.
- the layer thickness can change by up to 10 g per m 2 . Since minimum layer thicknesses must be guaranteed, the average layer thickness must be adjustable so that all areas of the strip are above the limit. In order to reduce zinc consumption, there is a desire to keep the fluctuation range as small as possible.
- the European patent specification also pursues this goal EP 1 794 339 B1 .
- the European patent specification preferably uses a coordinated layer thickness-strip vibration, strip shape and strip positioning control.
- the vibration control also called the belt stabilization device, dampens the vibrations of the belt. It comprises magnet pairs, which are preferably arranged in pairs over the bandwidth and are used as actuators for positioning the band. Each pair of magnets is preferably with a sensor for distance measurement and a controller equipped so that a force that varies across the bandwidth is exerted on the belt as a function of the forms of vibration that occur.
- the belt shape and belt position controller dampens the slow movements of the belt by changing the average force that acts on the belt across the belt.
- Each pair of magnets is controlled individually, in particular electrically, with the aid of the controller.
- the individual controllers are coordinated with the help of a higher-level controller, which takes into account the interactions between the controllers.
- the position of at least one magnet can be changed such that its distance from the band can be changed. The closer the magnet is to the tape, the less current or electrical energy is required to exert a desired force on the tape.
- document WO2016 / 078803 A discloses a method and an apparatus for coating a metal strip, the metal strip continuing after the wiping nozzle device through an electromagnetic stabilization device in order to keep the fluctuation range of the strip small.
- the same subject is in the documents JPH 1029827 A and WO2009 / 039949 A disclosed.
- the object of the invention is to provide an alternative possibility for generating a moment in the strip in a known method and a coating device for coating a strip.
- This object is achieved by the method claimed in claim 1.
- This method is characterized in that the control of the magnets of the belt stabilization device takes place in that at least one of the magnets, depending on the shape-control difference in the width direction of the belt, is displaced relative to at least one of the magnets on the opposite broad side of the belt and shifted into a travel position , where it faces at least approximately a trough in the actual shape of the tape.
- the paired arrangement of the individual magnets known from the prior art in opposition to each other on both broad sides of the band is dissolved and the individual magnets of a (former) pair of magnets are arranged offset to one another in the width direction of the band. While the opposing forces of the two magnets act in a line and therefore do not generate any torque when the magnets are compared in pairs, the inventive offset of the individual coils of the (former) magnet pair in the width direction causes a distance between the forces acting in opposite directions, as a result of which a desired Moment in or on the tape is generated. In this way the counter-bending results and therefore wavy bands can be smoothed and converted into a flat band.
- band and “metal band” are used interchangeably.
- shift in the width direction includes any movement of the magnet in space as long as the movement has a component in the width direction of the metal strip.
- downstream means: in the direction of transport of the metal strip.
- upstream means against the direction of transport of the metal strip.
- the actual position of the strip in addition to the actual shape, can also be determined within the scraper nozzle device.
- a position / control difference can also be determined as the difference between the actual position of the strip and a predetermined target The position of the strip in the area of the stripping nozzle device can be determined, and the displacement of the at least one magnet in the width direction of the strip relative to the magnets on the opposite broad side of the strip can also take place as a function of the positional control difference so that the strip is in its actual position is transferred to the specified target position.
- a magnet pair or a plurality of magnet pairs are arranged in a stationary manner symmetrically with respect to the center of the slot of the band stabilization device or the band - viewed in the width direction, the two magnets each facing one another on both broad sides of the band.
- the term symmetrical means that the pair of magnets is arranged in the middle.
- the stationary magnet pair or the stationary magnet pairs form a reference position. Relative to the at least one stationary pair of magnets, according to the invention at least some of the magnets adjacent to the stationary pair of magnets can be displaced or moved in the width direction of the band.
- two further magnets which form a pair of magnets, can be shifted into the area of the left or right edge of the band in such a way that the magnet of this pair of magnets which is at a greater distance from the edge of the band is centered on the height of the edge and that the magnet of the magnet pair that the has a smaller distance to the edge of the band, - compared to the magnet with the greater distance to the edge of the band - a bit to the center of the metal band - seen in the width direction - is arranged offset.
- This procedure is recommended for both the left and the right edge of the metal band. In this described procedure, too, the juxtaposition of the two individual magnets of the magnet pair is resolved by displacing them relative to one another in the width direction.
- the magnets are moved in the width direction of the belt so that they are at least approximately opposite a trough of the actual shape of the belt.
- oppositely directed tensile forces act on the metal strip at a distance from one another and thus generate a desired bending moment for reducing the curvatures or waveform in the strip.
- wave trough describes the situation that the difference between the distance of a magnet to the metal strip in its actual shape and the distance of the magnet to the metal strip in its target shape - assuming the same position of the metal strip in each case - is greater than zero, in particular is maximum. This means that the distance between the magnet and the metal strip is larger in the case of a wave trough than if the metal strip were to have its desired shape.
- the trough can then be applied by a tensile force exerted by the magnet or "bulged" onto the metal strip by a bending moment applied by at least two magnets.
- the magnets can only exert tensile forces, no compressive forces on the metal strip.
- the magnets can be moved in the width direction depending on the number of magnets available. With a larger number of magnets available, a finer resolution of the force acting on the tape is possible, whereby the waveform can be even more precisely balanced.
- the magnets can also be shifted in the width direction depending on the force that can be generated by the individual magnets on the belt. This lends itself to the background that the moment generated in the tape is the product of strength and distance. Against this background, a certain desired magnitude of the moment can be generated by an optionally suitable setting of either the generated force or the distance of the magnets from one another or from both.
- the magnets are advantageously designed in the form of electromagnetic coils because the coils allow the force on the metal strip to be set in a variable manner as a function of the current fed in.
- the position and shape of the magnets can also be carried out by suitably applying or supplying the coils with suitable currents.
- at least one of the coils is fed with such a current that the tape is due to the current-carrying coil acting on the band force is transferred to its target position in the middle of the stripping nozzle device and is stabilized there and / or that the actual shape of the band is adapted as well as possible to the target shape.
- the positioning and adjustment of the correction roller also offer a further possibility of influencing the shape and the position of the metal strip in the stripping nozzle device.
- the correction roller is positioned and adjusted upstream of the scraper nozzle device in such a way that it is ensured that the belt stabilization device is only operated within its operating limits.
- the correction roller can be moved appropriately not only before moving the magnets, but also during an ongoing coating process - as described in the previous paragraph.
- the correction roller can not only be positioned and adjusted to preset the position and shape of the belt. Rather, the correction roller can also be automatically positioned and adjusted so that when the predetermined force limits are exceeded the band in the band stabilization device the forces are again in a target area. This is particularly necessary when changing products, ie when changing to strips with different thicknesses or different materials with different yield strengths.
- the correction roller can also be automatically moved so that there are defined directions of action of the forces on the magnets to ensure unilateral or monotonous force application.
- Figure 1 shows a coating device 100 for coating a metal strip 200.
- the coating device 100 consists of a coating container 110 which is coated with liquid coating agent 112, e.g. B. zinc is filled.
- the metal strip 200 dips into the coating container and is deflected there in the liquid coating agent with the aid of a pot roller 150.
- the metal strip 200 is then guided past a correction roller 140 and subsequently through the slot of a wiping nozzle device 120 and further subsequently through the slot of a belt stabilization device 130.
- An air stream is preferably applied to the strip on both sides within the stripping nozzle device 120 in order to scrape off excess liquid coating agent.
- the band stabilization device 130 consists of a plurality of magnets 132 which are arranged on both broad sides of the band or the band stabilization device. These magnets are 132 typically in the form of electromagnetic coils.
- the coating device 100 further comprises a control device 160 for actuating an actuator 136 for displacing or moving the magnets 132 according to the invention in the width direction R of the strip and for setting the current I which is fed into the individual magnets.
- the control device can have an output for actuating an actuator 146 for positioning and adjusting the correction roller 140.
- the actuators 136, 146 are actuated and the current for the magnets is adjusted as a function of measurement signals from a distance sensor which traverses preferably in the width direction of the strip.
- the distance sensor detects the distribution of the distance of the metal strip in the width direction with respect to a reference position, e.g. B. the gap or slit of the band stabilization device. In this way, both the actual shape and / or the actual position of the metal strip is recorded.
- a separate shape sensor 170 for detecting the actual shape of the strip and a separate position sensor 180 for detecting the actual position of the metal strip can also be provided.
- the actual position and / or the actual shape of the metal strip within the stripping nozzle device 120 is determined by measuring the position and / or the shape of the strip either between the stripping nozzle device 120 and the strip stabilizing device 130 or within the strip stabilizing device 130 or upstream of the strip stabilizing device 130 and by subsequently concluding from the actual position and / or the actual shape of the band within the stripping nozzle device from the respectively measured position and / or form of the band.
- the actual position and / or the actual shape of the band within the band stabilization device 130 is determined by measuring the distance of the band from the magnets of the band stabilization device across the width of the band.
- Figure 2 shows various examples of possible undesirable actual shapes of the metal strip 200, specifically a U, an S and a W-shaped metal strip.
- the desired target shape of the metal strip 200 In the lower area shows Figure 2 on the other hand, the desired target shape of the metal strip 200. Accordingly, the metal strip is straight or flat in its target state.
- Figure 3 shows various undesired actual positions of the metal strip 200 in the slot 122 of the scraper nozzle device 120.
- the various actual positions are shown in broken lines, while the desired position SL is shown with a solid line.
- the target position is characterized in that the metal strip 200 is evenly spaced from the sides of the slot 122.
- the metal strip can be rotated or pivoted by an angle ⁇ in a first undesired actual position I1 relative to the target position SL.
- a second undesired actual position of the metal strip I2 of the metal strip is that the metal strip is displaced in parallel with respect to the desired position SL, so that the metal strip no longer has the same distances from the broad sides of the slot.
- a third typical undesirable actual position for the metal strip is that the metal strip is shifted in the longitudinal direction according to position I3 with respect to the desired position SL, so that its distances from the narrow sides of the slot 122 of the stripping device are no longer the same.
- Figure 4 illustrates the method according to the invention.
- the actual shape with a predetermined target shape of the tape, typically as in Figure 2 shown below.
- the deviations in the shape form a shape-control difference and the magnets 132 of the strap stabilization device 130 are controlled depending on the shape-control difference in such a way that the actual shape of the strap is converted into the desired shape of the strap.
- at least some of the magnets 132 in the width direction R of the Band 200 shifted relative to the magnets on the opposite broad side of the band in a travel position. These travel positions are in Figure 4 shown as an example.
- a position-control difference can also be determined analogously as the difference between the actual position of the belt and a predetermined target position SL in the area of the wiper nozzle device 120.
- the displacement of the at least one magnet 132-A in the width direction R of the band 200 relative to the magnets 132-B on the opposite broad side of the band 200 can accordingly also take place as a function of the positional control difference so that the band is in its actual position in the specified target position SL is transferred.
- Figure 4 shows a special embodiment for possible travel positions. Specifically, in this embodiment - seen in the width direction R - in the middle of the band 200 a pair of magnets 132-3-A; 132-3-B stationary arranged. The two magnets of this pair of magnets face each other on both broad sides A, B of the band 200. In contrast, the other coils or magnets are not arranged in the form of magnet pairs, the individual magnets 132-1, -2, -4, -5 are directly opposite one another. These remaining magnets are displaced or offset in the width direction R of the band relative to magnets on the other side of the band.
- two further magnets 132-1-A and 132-1-B form a left magnet pair, which is displaced into the area of the left edge of the band 200 in such a way that the magnet 132-1-B of the left magnet pair, which has the greater distance d I1 to the edge of the band has its center displaced at the level of the left edge and that that magnet 132-1-A of the left pair of magnets which has the smaller distance d I2 to the left edge of the band is opposite the magnet 132 -1-B with the greater distance d I1 to the edge of the band - a piece to the fixed magnet pair 132-3-A, 132-3-B, ie is offset to the middle of the band.
- a right pair of magnets 132-5-A, 132-5-B can be provided, which is displaced into the area of the right edge of the band 200 in such a way that its partial magnet 132-5-B, which has the greater distance d r1 has shifted to the right edge of the band 200 with its center at the level of the right edge. Furthermore, the partial magnet 132-5-A of the right pair of magnets, which has the smaller distance d r2 from the right edge of the band, becomes a bit towards the center of the band 200 compared to the magnet with the greater distance from the edge of the band transferred.
- the remaining magnets 132-2-A, 132-2-B, 132-4-A and 132-4-B which do not belong to either the right, left or middle pair of magnets, are preferably so in the width direction R of band 200 procedure that they are each at least approximately opposite a trough in the actual shape of the tape, as shown in Figure 4 is shown and by which the advantageous effect described above is achieved by generating the bending moments.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Computer Hardware Design (AREA)
- Coating With Molten Metal (AREA)
- Coating Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Description
Die Erfindung betrifft ein Verfahren zum Beschichten eines Metallbandes mit Hilfe einer Beschichtungseinrichtung. Innerhalb der Beschichtungseinrichtung durchläuft das Band zunächst einen Beschichtungsbehälter mit einem flüssigen Beschichtungsmittel, z. B. Zink, und nachfolgend eine Abstreifdüseneinrichtung zum Abstreifen von überflüssigem Zink von der Oberfläche des Metallbandes. Nach der Abstreifdüseneinrichtung durchläuft das Band typischerweise eine Bandstabilisierungseinrichtung mit einer Mehrzahl von Magneten auf beiden Breitseiten des Bandes.The invention relates to a method for coating a metal strip with the aid of a coating device. Inside the coating device, the belt first passes through a coating container with a liquid coating agent, e.g. B. zinc, and subsequently a stripping nozzle device for stripping excess zinc from the surface of the metal strip. After the stripping nozzle device, the belt typically passes through a belt stabilization device with a plurality of magnets on both broad sides of the belt.
In Feuerverzinkungslinien aus dem Stand der Technik variieren heute die Zinkschichtdicken sowohl über die Länge als auch über die Breite des Bandes. Die Schichtdicke kann sich dabei um bis zu 10 g pro m2 ändern. Da minimale Schichtdicken garantiert werden müssen, muss die mittlere Schichtdicke so einstellbar sein, dass alle Bereiche des Bandes über dem Grenzwert liegen. Um den Zinkverbrauch zu reduzieren, besteht der Wünsch, die Schwankungsbreite möglichst gering zu halten.In hot-dip galvanizing lines from the prior art, the zinc layer thicknesses vary both over the length and over the width of the strip. The layer thickness can change by up to 10 g per m 2 . Since minimum layer thicknesses must be guaranteed, the average layer thickness must be adjustable so that all areas of the strip are above the limit. In order to reduce zinc consumption, there is a desire to keep the fluctuation range as small as possible.
Dieses Ziel verfolgt auch die europäische Patentschrift
Bei der aus der europäischen Patentschrift bekannten gegenüberliegenden Anordnung der Magnete werden grundsätzlich nur reine Zugkräfte auf das Band ausgeübt. Durch diese reinen Zugkräfte können Variationen der Bandposition, d. h. Veränderungen der Ist-Lage des Bandes in beide Richtungen quer zu dem Band vorgenommen werden. Wie bereits gesagt, lassen sich auf diese Weise Bandbewegungen und die Ist-Lage des Bandes gut beeinflussen.In the opposite arrangement of the magnets known from the European patent specification, basically only pure tensile forces are exerted on the tape. Due to these pure tensile forces, variations in the belt position, i. H. Changes in the actual position of the tape in both directions across the tape can be made. As already mentioned, belt movements and the actual position of the belt can be influenced well in this way.
Um jedoch Bandkrümmungen, wie z. B. eine U-, S- oder W-Form auszugleichen, muss ein Moment auf das Band ausgeübt werden. Dies geschieht gemäß der
Der Erfindung liegt die Aufgabe zugrunde, bei einem bekannten Verfahren und einer Beschichtungseinrichtung zum Beschichten eines Bandes eine alternative Möglichkeit zum Erzeugen eines Momentes in dem Band aufzuzeigen.The object of the invention is to provide an alternative possibility for generating a moment in the strip in a known method and a coating device for coating a strip.
Diese Aufgabe wird durch das in Patentanspruch 1 beanspruchte Verfahren gelöst. Dieses Verfahren ist dadurch gekennzeichnet, dass das Ansteuern der Magnete der Bandstabilisierungseinrichtung erfolgt, indem zumindest einer der Magnete in Abhängigkeit von der Form-Regeldifferenz in Breitenrichtung des Bandes relativ zu zumindest einem der Magnete auf der gegenüberliegenden Breitseite des Bandes versetzt und in eine Verfahrposition verlagert wird, wo er zumindest näherungsweise einem Wellental in der Ist-Form des Bandes gegenübersteht.This object is achieved by the method claimed in
Somit wird erfindungsgemäß die aus dem Stand der Technik bekannte paarweise Anordnung der einzelnen Magnete in Gegenüberstellung auf beiden Breitseiten des Bandes aufgelöst und die einzelnen Magnete eines (ehemaligen) Magnetpaares werden in Breitenrichtung des Bandes versetzt zueinander angeordnet. Während bei einer paarweisen Gegenüberstellung der Magnete die entgegengesetzten Kräfte der beiden Magnete in einer Linie wirken und deshalb kein Drehmoment erzeugen, bewirkt der erfindungsgemäße Versatz der einzelnen Spulen des (ehemaligen) Magnetpaares in Breitenrichtung einen Abstand zwischen den in entgegengesetzte Richtungen wirkenden Kräfte, wodurch ein gewünschtes Moment in dem bzw. auf das Band generiert wird. Auf diese Weise ergibt sich die besagte Gegenbiegung und deshalb können auf diese Weise wellenförmige Bänder geglättet und in ein ebenes Band überführt werden.Thus, according to the invention, the paired arrangement of the individual magnets known from the prior art in opposition to each other on both broad sides of the band is dissolved and the individual magnets of a (former) pair of magnets are arranged offset to one another in the width direction of the band. While the opposing forces of the two magnets act in a line and therefore do not generate any torque when the magnets are compared in pairs, the inventive offset of the individual coils of the (former) magnet pair in the width direction causes a distance between the forces acting in opposite directions, as a result of which a desired Moment in or on the tape is generated. In this way the counter-bending results and therefore wavy bands can be smoothed and converted into a flat band.
Die Begriffe "Band" und "Metallband" werden gleichbedeutend verwendet.
Der Begriff "verlagern in Breitenrichtung" schließt eine beliebige Bewegung des Magneten im Raum ein, solange die Bewegung eine Komponente in Breitenrichtung des Metallbandes aufweist.The terms "band" and "metal band" are used interchangeably.
The term "shift in the width direction" includes any movement of the magnet in space as long as the movement has a component in the width direction of the metal strip.
Der Begriff "stromabwärts" bedeutet: In Transportrichtung des Metallbandes. Umgekehrt bedeutet "stromaufwärts" entgegen der Transportrichtung des Metallbandes.The term "downstream" means: in the direction of transport of the metal strip. Conversely, "upstream" means against the direction of transport of the metal strip.
Gemäß einem ersten Ausführungsbeispiel kann zusätzlich zu der Ist-Form auch die Ist-Lage des Bandes innerhalb der Abstreifdüseneinrichtung ermittelt werden, kann zusätzlich zu der Form-Regeldifferenz auch eine Lage-Regeldifferenz als Unterschied zwischen der Ist-Lage des Bandes und einer vorgegebenen Soll-Lage des Bandes im Bereich der Abstreifdüseneinrichtung ermittelt werden, und kann die Verlagerung des mindestens einen Magneten in Breitenrichtung des Bandes relativ zu den Magneten auf der gegenüberliegenden Breitseite des Bandes auch in Abhängigkeit der Lage-Regeldifferenz so erfolgen, dass das Band von seiner Ist-Lage in die vorgegebene Soll-Lage überführt wird.According to a first exemplary embodiment, in addition to the actual shape, the actual position of the strip can also be determined within the scraper nozzle device. In addition to the shape / control difference, a position / control difference can also be determined as the difference between the actual position of the strip and a predetermined target The position of the strip in the area of the stripping nozzle device can be determined, and the displacement of the at least one magnet in the width direction of the strip relative to the magnets on the opposite broad side of the strip can also take place as a function of the positional control difference so that the strip is in its actual position is transferred to the specified target position.
Gemäß einem weiteren Ausführungsbeispiel sind symmetrisch zu der Mitte des Schlitzes der Bandstabilisierungseinrichtung oder des Bandes - in Breitenrichtung gesehen - ein Magnetpaar oder mehrere Magnetpaare ortsfest angeordnet, wobei sich die beiden Magnete jeweils eines Magnetpaares auf beiden Breitseiten des Bandes gegenüberstehen. In dem Falle, dass nur ein ortsfestes Magnetpaar vorgesehen ist, bedeutet der Begriff symmetrisch, dass das Magnetpaar in der Mitte angeordnet ist. Das ortsfeste Magnetpaar oder die ortsfesten Magnetpaare bilden eine Referenzposition. Relativ zu dem mindestens einen ortsfesten Magnetpaar sind erfindungsgemäß zumindest einzelne der zu dem ortsfesten Magnetpaar benachbarten Magnete in Breitenrichtung des Bandes verlagerbar bzw. verfahrbar.According to a further exemplary embodiment, a magnet pair or a plurality of magnet pairs are arranged in a stationary manner symmetrically with respect to the center of the slot of the band stabilization device or the band - viewed in the width direction, the two magnets each facing one another on both broad sides of the band. In the event that only one stationary pair of magnets is provided, the term symmetrical means that the pair of magnets is arranged in the middle. The stationary magnet pair or the stationary magnet pairs form a reference position. Relative to the at least one stationary pair of magnets, according to the invention at least some of the magnets adjacent to the stationary pair of magnets can be displaced or moved in the width direction of the band.
So können insbesondere zwei weitere Magnete, welche ein Magnetpaar bilden, derart in den Bereich des linken oder des rechten Randes des Bandes verlagert werden, dass derjenige Magnet dieses Magnetpaares, welcher den größeren Abstand zu dem Rand des Bandes aufweist, mit seiner Mitte auf die Höhe des Randes verlagert wird und dass derjenige Magnet des Magnetpaares, welcher den kleineren Abstand zu dem Rand des Bandes aufweist, - gegenüber dem Magneten mit dem größeren Abstand zum Rand des Bandes - ein Stück weit zur Mitte des Metallbandes - in Breitenrichtung gesehen - hin versetzt angeordnet wird. Diese Vorgehensweise empfiehlt sich sowohl für den linken wie auch für den rechten Rand des Metallbandes. Auch bei dieser beschriebenen Vorgehensweise wird die Gegenüberstellung der beiden einzelnen Magnete des Magnetpaares aufgelöst, indem diese in Breitenrichtung relativ zueinander versetzt werden. Die beschriebene Vorgehensweise empfiehlt sich insbesondere, wie gesagt, für die Randbereiche des Metallbandes, denn die dort oftmals stark variierenden Bandkrümmungen können mit den traditionell gegenüberstehenden Magneten eines Magnetpaares bzw. mit der Kraftwirkung zwischen benachbarten Magnetpaaren oftmals nicht ausreichend ausgeglichen werden. Für diesen speziellen Anwendungsfall ist der erfindungsgemäße Versatz von einzelnen Magneten eines Magnetpaares in Breitenrichtung relativ zueinander wesentlich effektiver.In particular, two further magnets, which form a pair of magnets, can be shifted into the area of the left or right edge of the band in such a way that the magnet of this pair of magnets which is at a greater distance from the edge of the band is centered on the height of the edge and that the magnet of the magnet pair that the has a smaller distance to the edge of the band, - compared to the magnet with the greater distance to the edge of the band - a bit to the center of the metal band - seen in the width direction - is arranged offset. This procedure is recommended for both the left and the right edge of the metal band. In this described procedure, too, the juxtaposition of the two individual magnets of the magnet pair is resolved by displacing them relative to one another in the width direction. The procedure described is particularly recommended, as I said, for the edge areas of the metal band, because the band curvatures, which often vary greatly there, can often not be adequately compensated for with the traditionally opposed magnets of a magnet pair or with the force effect between adjacent magnet pairs. For this special application, the offset according to the invention of individual magnets of a pair of magnets in the width direction relative to one another is considerably more effective.
Allgemein gesprochen, werden zumindest einzelne der Magnete in Breitenrichtung des Bandes so verfahren, dass sie zumindest näherungsweise einem Wellental der Ist-Form des Bandes gegenüberstehen. Bei dieser Anordnung wirken entgegengesetzt gerichtete Zugkräfte beabstandet zueinander auf das Metallband und erzeugen so ein gewünschtes Biegemoment zum Abbau der Krümmungen bzw. Wellenform in dem Band.Generally speaking, at least some of the magnets are moved in the width direction of the belt so that they are at least approximately opposite a trough of the actual shape of the belt. In this arrangement, oppositely directed tensile forces act on the metal strip at a distance from one another and thus generate a desired bending moment for reducing the curvatures or waveform in the strip.
Der Begriff "Wellental" beschreibt die Situation, dass die Differenz zwischen dem Abstand eines Magneten zu dem Metallband in seiner Ist-Form und dem Abstand des Magneten zu dem Metallband in seiner Soll-Form - jeweils gleiche Lage des Metallbandes vorausgesetzt - größer Null, insbesondere maximal ist. Das heißt, der Abstand zwischen dem Magneten und dem Metallband ist im Falle eines Wellentales größer als wenn das Metallband seine Soll-Form aufweisen würde. Dann kann das Wellental durch eine von dem Magneten aufgebrachte Zugkraft oder durch ein von mindestens zwei Magneten aufgebrachtes Biegemoment auf das Metallband "ausgebeult" werden.The term "wave trough" describes the situation that the difference between the distance of a magnet to the metal strip in its actual shape and the distance of the magnet to the metal strip in its target shape - assuming the same position of the metal strip in each case - is greater than zero, in particular is maximum. This means that the distance between the magnet and the metal strip is larger in the case of a wave trough than if the metal strip were to have its desired shape. The trough can then be applied by a tensile force exerted by the magnet or "bulged" onto the metal strip by a bending moment applied by at least two magnets.
Zu beachten ist, dass mit den Magneten nur Zugkräfte, keine Druckkräfte auf das Metallband ausgeübt werden können.It should be noted that the magnets can only exert tensile forces, no compressive forces on the metal strip.
Bei symmetrischen wellenförmigen Ist-Formen des Bandes empfiehlt sich ein zur Mitte des Bandes symmetrisches Verfahren der Magnete in Breitenrichtung.In the case of symmetrical, wave-like actual shapes of the band, it is advisable to move the magnets symmetrically in the width direction to the center of the band.
Die Verlagerung der Magnete in Breitenrichtung kann in Abhängigkeit der verfügbaren Anzahl von Magneten erfolgen. Bei einer größeren verfügbaren Anzahl von Magneten ist eine feinere Auflösung der Krafteinwirkung auf das Band möglich, wodurch die Wellenform noch genauer ausgeglichen werden kann.The magnets can be moved in the width direction depending on the number of magnets available. With a larger number of magnets available, a finer resolution of the force acting on the tape is possible, whereby the waveform can be even more precisely balanced.
Die Verlagerung der Magnete in Breitenrichtung kann auch in Abhängigkeit der von den einzelnen Magneten generierbaren Kraft auf das Band erfolgen. Dies bietet sich an vor dem Hintergrund, dass das in dem Band erzeugte Moment das Produkt aus Kraft und Abstand ist. Vor diesem Hintergrund kann eine bestimmte gewünschte Größe des Momentes erzeugt werden durch eine wahlweise geeignete Einstellung von entweder der generierten Kraft, oder des Abstandes der Magnete zueinander oder von beidem.The magnets can also be shifted in the width direction depending on the force that can be generated by the individual magnets on the belt. This lends itself to the background that the moment generated in the tape is the product of strength and distance. Against this background, a certain desired magnitude of the moment can be generated by an optionally suitable setting of either the generated force or the distance of the magnets from one another or from both.
Die Magnete sind vorteilhafterweise in Form von elektromagnetischen Spulen ausgebildet, weil die Spulen eine variable Einstellung der Kraft auf das Metallband gestatten in Abhängigkeit des eingespeisten Stromes. Ergänzend zu der erfindungsgemäß beanspruchten Beeinflussung der Lage und der Form des Bandes durch geeignete Verlagerung einzelner Magnete in Breitenrichtung des Bandes, kann die Lage und die Form der Magnete zusätzlich auch durch eine geeignete Beaufschlagung bzw. Speisung der Spulen mit geeigneten Strömen erfolgen. Konkret wird erfindungsgemäß zumindest eine der Spulen mit einem solchen Strom gespeist, dass das Band aufgrund der durch die stromdurchflossene Spule auf das Band einwirkenden Kraft in seine Soll-Lage in der Mitte der Abstreifdüseneinrichtung überführt und dort stabilisiert wird und/oder dass die Ist-Form des Bandes möglichst gut an die Soll-Form angepasst wird.The magnets are advantageously designed in the form of electromagnetic coils because the coils allow the force on the metal strip to be set in a variable manner as a function of the current fed in. In addition to influencing the position and shape of the tape as claimed by the invention by suitable displacement of individual magnets in the width direction of the tape, the position and shape of the magnets can also be carried out by suitably applying or supplying the coils with suitable currents. Specifically, according to the invention, at least one of the coils is fed with such a current that the tape is due to the current-carrying coil acting on the band force is transferred to its target position in the middle of the stripping nozzle device and is stabilized there and / or that the actual shape of the band is adapted as well as possible to the target shape.
Neben der erfindungsgemäßen Verschiebung einzelner Magnete in Breitenrichtung des Bandes und der besagten Möglichkeit zur Wahl geeigneter Ströme für die Spulen bietet auch die Positionierung und Anstellung der Korrekturrolle eine weitere Möglichkeit zur Einflussnahme auf die Form und die Lage des Metallbandes in der Abstreifdüseneinrichtung. Konkret wird erfindungsgemäß beansprucht, dass die Korrekturrolle stromaufwärts der Abstreifdüseneinrichtung derart positioniert und angestellt wird, dass sichergestellt ist, dass die Bandstabilisierungseinrichtung nur innerhalb ihrer Betriebsgrenzen betrieben wird. Anders ausgedrückt besteht durch eine geeignete Positionierung und Anstellung der Korrekturrolle die Möglichkeit, die Lage und/oder die Form des Metallbandes in dem Schlitz der Abstreifdüseneinrichtung bereits so voreinzustellen, dass nur noch so wenig Korrekturbedarf bezüglich der Form und / oder der Lage des Metallbandes besteht, dass die Magnete in der Bandstabilisierungseinrichtung zur Realisierung der Korrektur nicht mit Strömen außerhalb ihrer Betriebsgrenzen betrieben werden müssen. Auch der verbleibende Korrekturbedarf zur Anpassung der Ist-Lage an die Soll-Lage und/oder zur Anpassung der Ist-Form des Bandes an seine Soll-Form erfolgt dann erfindungsgemäß durch geeignete Verlagerung einzelner Magnete in Breitenrichtung sowie durch eine Speisung dieser Magnete mit einem jeweils geeigneten Strom.In addition to the displacement of individual magnets according to the invention in the width direction of the strip and the said possibility of selecting suitable currents for the coils, the positioning and adjustment of the correction roller also offer a further possibility of influencing the shape and the position of the metal strip in the stripping nozzle device. Specifically, it is claimed according to the invention that the correction roller is positioned and adjusted upstream of the scraper nozzle device in such a way that it is ensured that the belt stabilization device is only operated within its operating limits. In other words, by means of a suitable positioning and adjustment of the correction roller, it is possible to preset the position and / or the shape of the metal strip in the slot of the scraper nozzle device so that there is only so little need for correction with regard to the shape and / or position of the metal strip, that the magnets in the band stabilization device do not have to be operated with currents outside their operating limits in order to implement the correction. The remaining need for correction to adapt the actual position to the desired position and / or to adapt the actual shape of the strip to its desired shape is then carried out according to the invention by suitable displacement of individual magnets in the width direction and by feeding these magnets with one each suitable current.
Die Korrekturrolle kann nicht nur vor dem Verfahren der Magnete, sondern auch während eines laufenden Beschichtungsprozesses - wie im vorherigen Absatz beschrieben - geeignet verfahren werden. Auch kann die Korrekturrolle nicht nur zur Voreinstellung der Lage und Form des Bandes positioniert und angestellt werden. Vielmehr kann die Korrekturrolle auch automatisch so positioniert und angestellt werden, dass bei Überschreitung von vorgegebenen Kraftgrenzen auf das Band in der Bandstabilisierungseinrichtung die Kräfte wieder in einem Zielbereich liegen. Dies ist insbesondere bei Produktwechseln, d. h. beim Übergang auf Bänder mit unterschiedlichen Dicken oder unterschiedlichen Materialien mit unterschiedlichen Streckgrenzen erforderlich. Auch kann die Korrekturrolle automatisch so verfahren werden, dass es definierte Wirkrichtungen der Kräfte an den Magneten gibt, um eine einseitige bzw. monotone Krafteinleitung sicherzustellen.The correction roller can be moved appropriately not only before moving the magnets, but also during an ongoing coating process - as described in the previous paragraph. The correction roller can not only be positioned and adjusted to preset the position and shape of the belt. Rather, the correction roller can also be automatically positioned and adjusted so that when the predetermined force limits are exceeded the band in the band stabilization device the forces are again in a target area. This is particularly necessary when changing products, ie when changing to strips with different thicknesses or different materials with different yield strengths. The correction roller can also be automatically moved so that there are defined directions of action of the forces on the magnets to ensure unilateral or monotonous force application.
Schließlich ist vorgesehen, dass die Verfahrpositionen der Magnete in Breitenrichtung, die Ströme, mit denen die Spulen beaufschlagt werden und/oder die Position und die Anstellung der Korrekturrolle in einer Datenbank abgespeichert werden. Dabei erfolgt die Abspeicherung vorzugsweise klassifiziert nach der Stahlsorte des Bandes, der Streckgrenze des Bandes, der Dicke des Bandes, der Breite des Bandes, der Temperatur des Bandes beim Durchlaufen der Beschichtungseinrichtung und/oder nach der Temperatur des Beschichtungsmittels in dem Beschichtungsbehälter beim Durchlaufen des Bandes. Durch die Speicherung dieser Daten können bei zukünftigen Beschichtungsvorgängen bessere Startwerte insbesondere durch die Verfahrpositionen der Magnete in Breitenrichtung der dann zu beschichtenden neuen Bänder ermittelt werden.
Die oben genannte Aufgabe wird weiterhin durch eine Beschichtungsvorrichtung gemäß den Ansprüchen 19 bis 23 gelöst. Die Vorteile dieser Beschichtungseinrichtung entsprechen den oben mit Bezug auf das erfindungsgemäße Verfahren genannten Vorteilen.
Weitere vorteilhafte Ausgestaltungen des erfindungsgemäßen Verfahrens sind Gegenstand der abhängigen Ansprüche.
Der Beschreibung sind vier Figuren beigefügt, wobei
Figur 1- eine Beschichtungseinrichtung;
Figur 2- bekannte Ist-Formen und eine bekannte Soll-Form des Bandes;
Figur 3- bekannte Ist- und Soll-Lagen des Bandes; und
Figur 4- ein erfindungsgemäßes Verfahren von Magneten in Breitenrichtung des Bandes
The above object is further achieved by a coating device according to claims 19 to 23. The advantages of this coating device correspond to the advantages mentioned above with reference to the method according to the invention.
Further advantageous embodiments of the method according to the invention are the subject of the dependent claims.
The description is accompanied by four figures
- Figure 1
- a coating device;
- Figure 2
- known actual shapes and a known target shape of the tape;
- Figure 3
- known actual and target positions of the tape; and
- Figure 4
- an inventive method of magnets in the width direction of the tape
Die erfindungsgemäße Beschichtungseinrichtung und das erfindungsgemäße Verfahren werden nachfolgend unter Bezugnahme auf die genannten Figuren in Form von Ausführungsbeispielen detailliert beschrieben. In allen Figuren sind gleiche technische Elemente mit gleichen Bezugszeichen bezeichnet.The coating device according to the invention and the method according to the invention are described in detail below with reference to the figures mentioned in the form of exemplary embodiments. In all figures, the same technical elements are denoted by the same reference symbols.
Die Bandstabilisierungseinrichtung 130 besteht aus einer Mehrzahl von Magneten 132, die auf beiden Breitseiten des Bandes bzw. der Bandstabilisierungseinrichtung angeordnet sind. Diese Magnete 132 sind typischerweise in Form von elektromagnetischen Spulen ausgebildet. Die Beschichtungseinrichtung 100 umfasst weiterhin eine Steuereinrichtung 160 zum Ansteuern eines Aktuators 136 zum Verschieben bzw. Verfahren der Magnete 132 erfindungsgemäß in Breitenrichtung R des Bandes und zum Einstellen des Stromes I, der in die einzelnen Magnete eingespeist wird. Darüber hinaus kann die Steuereinrichtung einen Ausgang aufweisen zum Ansteuern eines Aktuators 146 zum Positionieren und Anstellen der Korrekturrolle 140. Die Ansteuerung der Aktuatoren 136, 146 sowie die Einstellung des Stromes für die Magnete erfolgt in Abhängigkeit von Messsignalen eines vorzugsweise in Breitenrichtung des Bandes traversierenden Abstandssensor. Der Abstandssensor erfasst die Verteilung des Abstandes des Metallbandes in Breitenrichtung in Bezug auf eine Referenzposition, z. B. den Spalt bzw. Schlitz der Bandstabilisierungseinrichtung. Auf diese Weise wird sowohl die Ist-Form und/oder auch die Ist-Lage des Metallbandes erfasst. Alternativ können auch ein separater Formsensor 170 zur Erfassung der Ist-Form des Bandes und ein separater Lagesonsor 180 zur Erfassung der Ist-Lage des Metallbandes vorgesehen sein.The band stabilization device 130 consists of a plurality of
Das Ermitteln der Ist-Lage und/oder der Ist-Form des Metallbandes innerhalb der Abstreifdüseneinrichtung 120 erfolgt durch Messen der Lage und/oder der Form des Bandes entweder zwischen der Abstreifdüseneinrichtung 120 und der Bandstabilisierungseinrichtung 130 oder innerhalb der Bandstabilisierungseinrichtung 130 oder stromaufwärts der Bandstabilisierungseinrichtung 130 und durch anschließendes Rückschließen auf die Ist-Lage und/oder die Ist-Form des Bandes innerhalb der Abstreifdüseneinrichtung aus der jeweils gemessenen Lage und/oder Form des Bandes. Dabei erfolgt das Ermitteln der Ist-Lage und/oder der Ist-Form des Bandes innerhalb der Bandstabilisierungseinrichtung 130 durch Messen des Abstandes des Bandes zu den Magneten der Bandstabilisierungseinrichtung über der Breite des Bandes.The actual position and / or the actual shape of the metal strip within the stripping
Zusätzlich zu der Ist-Form kann auch die Ist-Lage des Bandes 200 innerhalb der Abstreifdüseneinrichtung 120 ermittelt werden. Unerwünschte Ausprägungen dieser Ist-Lage wurden oben bereits unter Bezugnahme auf
Allgemein ist es sinnvoll, dass zumindest einzelne der stromdurchflossenen, d. h. der aktiven Magnete 132 in Breitenrichtung R des Bandes 200 so verfahren werden, dass sie in ihrer Verfahrposition, auch Endposition genannt, zumindest näherungsweise einem Wellental in der Ist-Form des Bandes 200 gegenüberstehen, wie dies in
Konkret bilden zwei weitere Magnete 132-1-A und 132-1-B ein linkes Magnetpaar, welches derart in den Bereich des linken Randes des Bandes 200 verlagert wird, dass derjenige Magnet 132-1-B des linken Magnetpaares, welcher den größeren Abstand dI1 zu dem Rand des Bandes aufweist mit seiner Mitte auf Höhe des linken Randes verlagert ist und dass derjenige Magnet 132-1-A des linken Magnetpaares, welcher den kleineren Abstand dI2 zu dem linken Rand des Bandes aufweist, - gegenüber dem Magneten 132-1-B mit dem größeren Abstand dI1 zum Rand des Bandes - ein Stück weit zu dem ortsfesten Magnetpaar 132-3-A, 132-3-B, d. h. zu Bandmitte hin versetzt angeordnet ist. Durch die versetzte Anordnung der beiden Teilspulen 132-1-A und 132-1-B des linken Spulenpaares wird das in
Alternativ oder zusätzlich kann ein rechtes Magnetpaar 132-5-A, 132-5-B vorgesehen sein, welches derart in den Bereich des rechten Randes des Bandes 200 verlagert wird, dass sein Teilmagnet 132-5-B, welcher den größeren Abstand dr1 zu dem rechten Rand des Bandes 200 aufweist mit seiner Mitte auf Höhe des rechten Randes verlagert wird. Weiterhin wird dann derjenige Teilmagnet 132-5-A des rechten Magnetpaares, welcher den kleineren Abstand dr2 zu dem rechten Rand des Bandes aufweist, - gegenüber dem Magneten mit dem größeren Abstand zum Rand des Bandes - ein Stück weit zur Mitte des Bandes 200 hin versetzt. In diesem Fall bewirken die in
Die übrigen Magnete 132-2-A, 132-2-B, 132-4-A und 132-4-B, welche weder dem rechten noch dem linken, noch dem mittleren Magnetpaar angehören, werden in Breitenrichtung R des Bandes 200 vorzugsweise so verfahren, dass sie zumindest näherungsweise jeweils einem Wellental in der Ist-Form des Bandes gegenüberstehen, wie dies in
Wie ebenfalls in
- 100100
- BeschichtungseinrichtungCoating facility
- 110110
- BeschichtungsbehälterCoating container
- 112112
- BeschichtungsmittelCoating agent
- 120120
- AbstreifdüseneinrichtungScraper nozzle device
- 122122
- Schlitz der AbstreifdüseneinrichtungScraper nozzle slot
- 130130
- BandstabilisierungseinrichtungBelt stabilization device
- 132132
- MagneteMagnets
- 136136
- AktuatorActuator
- 140140
- KorrekturrolleCorrection role
- 150150
- PotrollePot roll
- 160160
- SteuereinrichtungControl device
- 170170
- FormsensorShape sensor
- 180180
- LagesensorPosition sensor
- 200200
- MetallbandMetal strap
- dl1 d l1
- Abstanddistance
- dl2 d l2
- Abstanddistance
- dr1 d r1
- Abstanddistance
- dr2 d r2
- Abstanddistance
- FF
- Kraftforce
- I1I1
- SchrägstellungInclination
- I2I2
- ParallelverschiebungParallel shift
- I3I3
- VersatzOffset
- MM
- BiegemomentBending moment
- RR
- BreitenrichtungWidth direction
- SLSL
- Soll-LageTarget position
- αα
- Winkelangle
Claims (23)
- A method for coating a metal strip (200) with the help of a coating device (100), in which the strip (200) is guided through a coating container (110) with a liquid coating agent (112), subsequently through the slot of a stripping nozzle device (120) and then subsequently through the slot of a strip stabilizing device (130) with a plurality of magnets (132) on the two broad sides of the strip, including the following steps:determining the actual shape of the strip (200) within the stripping nozzle device (120) over the width of the strip;determining a shape control deviation as the difference between the actual shape of the strip (200) and a predetermined setpoint shape of the strip in the area of the stripping nozzle device (120); andcontrolling the magnets (132) of the strip stabilization device as actuators so that the actual shape of the strip (200) is transformed into the setpoint shape of the strip;characterized in thatthe controlling of the magnets of the strip stabilization device occurs by shifting at least one of the magnets (132-A) as a function of the shape control deviation in the width direction (R) of the strip (200) relative to at least one of the magnets (132-B) on the opposite broad side of the strip and moving the same into a processing position in which it is at least approximately opposite a trough in the actual shape of the strip.
- The method according to claim 1,
characterized in that,
in addition to the actual shape, the actual position of the strip (200) inside the stripping nozzle device (120) is also determined;
in that, in addition to the shape control deviation, a position control deviation is also determined as the difference between the actual position of the strip and a predetermined setpoint position of the strip (200) in the area of the stripping nozzle device (120); and
in that the movement of the at least one magnet (132-A) in the width direction (R) of the strip (200) relative to the magnets (132-B) on the opposite broad side of the strip (200) also occurs as a function of the position control deviation so that the strip is conveyed from its actual position to its predetermined setpoint position. - The method according to one of the preceding claims,
characterized in that,- viewed in the width direction - a magnet pair or a plurality of magnet pairs (132-3-A; 132-3-B) are arranged in a stationary manner symmetrically in relation to the centre of the slot of the strip stabilization device (130) or of the strip (200), wherein the two magnets of a magnet pair are respectively arranged on the two broad sides (A, B) of the strip opposite one another; and
in that at least some of the magnets (132-1, -2, -4, - 5) adjacent to the at least one stationary magnet pair are moved in relation to the stationary magnet pair in the width direction (R) of the strip (200) so that, in their processing position, they are at least approximately opposite a trough in the actual shape of the strip. - The method according to one of the preceding claims,
characterized in that
the movement of the at least one magnet in the width direction (R) occurs symmetrically in relation to the centre of the strip. - The method according to one of the preceding claims,
characterized in that
two further magnets (132-1-A; 132-1-B) form a left magnet pair, which is moved into the area of the left edge of the strip so that the magnet (132-1-B) of the left magnet pair which is at a greater distance (dl1) from the edge of the strip is moved with its centre to the height of the left edge, and in that the magnet (132-1-A) of the left magnet pair which is at a smaller distance (dl2) from the left edge of the strip (200) - viewed in the width direction - is arranged so as to be offset in relation to the centre of the metal strip so that it is at least approximately opposite a trough in the actual shape of the strip;
and/or
in that still two further magnets (132-5-A; 132-5-B) form a right magnet pair, which is moved into the area of the right edge of the strip (200) so that the magnet (132-5-B) of the right magnet pair which is at a greater distance (dr1) from the edge of the strip (200) is moved with its centre to the height of the right edge, and in that the magnet (132-5-A) of the right magnet pair which is at a smaller distance (dr2) from the right edge of the strip - viewed in the width direction - is arranged so as to be offset in relation to the centre of the metal strip so that it is at least approximately opposite a trough in the actual shape of the strip. - The method according to claim 5,
characterized in that
the remaining magnets (132-2-A, 132-2-B, 132-4-A, 132-4-B) which do not belong to the right, left or centre magnet pair are moved in the width direction (R) of the strip (200) so that they are at least approximately opposite a trough in the actual shape of the strip. - The method according to one of the preceding claims,
characterized in that
the determination of the actual position and/or of the actual shape of the strip (200) occurs within the stripping nozzle device (120) by
measuring the position and/or shape of the strip either between the stripping nozzle device (120) and the strip stabilization device (130), or within the strip stabilization device or downstream from the strip stabilization device; and by
inferring the actual position and/or actual shape of the strip (200) within the stripping nozzle device (120) from the measured position and/or shape of the strip. - The method according claim 7,
characterized in that
the determination of the actual position and/or of the actual shape of the strip occurs within the strip stabilization device (130) by measuring the distance of the strip from the magnets of the strip stabilization device over the width of the strip. - The method according to one of the preceding claims,
characterized in that
the movement of the magnets in the width direction (R) additionally occurs as a function of the available number of magnets (132) on each of the broad sides of the strip. - The method according to one of the preceding claims,
characterized in that
the movement of the magnets (132) in the width direction (R) occurs as a function of the force (F) acting on the strip (200) that can be generated by the individual magnets. - The method according to one of the preceding claims,
characterized in that
the magnets (132) are configured in the shape of electromagnetic coils. - The method according to claim 11,
characterized in that
at least one of the coils is fed with such a current that the strip is conveyed as a result of the force (F) acting on the strip through the active coil into its setpoint position in the centre of the stripping nozzle device (120) and is stabilized there and/or in that the actual shape of the strip is adapted as optimally as possible to the setpoint shape. - The method according to one of the preceding claims,
characterized in that
a correcting roller (140) is positioned and engaged upstream from the stripping nozzle device so that the strip stabilization device and in particular its magnets can be operated within their operating limits. - The method according to one of the preceding claims,
characterized in that
the actual shape of the strip (200) designates, for example, an S- or U- or W-shaped cross-section of the strip. - The method according to one of the preceding claims,
characterized in that
the setpoint shape of the strip (200) designates a rectangular cross-section or the evenness of the strip. - The method according to one of the preceding claims,
characterized in that
the actual position of the strip (200) designates, for example, an inclined position (11) or a translation (12) or an offset (13) of the strip (200) in relation to the setpoint position (SL) in the slot (122) of the stripping nozzle device (120). - The method according to one of the preceding claims,
characterized in that
the setpoint position (SL) of the strip designates the centred position in the slot (122) of the stripping nozzle device (120). - The method according to one of the preceding claims,
characterized in that
the processing positions of the magnets in the width direction (R), the currents applied to the coils and/or the position and engagement of the correcting roller (140) are saved in a database, preferably classified according to the steel grade of the strip (200), the yield strength of the strip, the thickness of the strip, the width of the strip, the temperature of the strip and/or according to the temperature of the coating agent (112) in the coating container (110) when the strip (200) is run through it. - A coating device (100) for coating a metal strip with a coating agent (110), for example zinc, having:a coating container (110), which is filled with the liquid coating agent;a stripping nozzle device (120);a strip stabilization device (130) with a plurality of magnets (132) on the two broad sides of a slot of the strip stabilization device;at least one sensor (170, 180) for the capture of the actual shape and/or of the actual position of the metal strip in the slot of the stripping nozzle device (120); anda control device (160) for determining a shape control deviation as the difference between the actual shape of the strip (200) and a predetermined setpoint shape of the strip in the area of the stripping nozzle device (120) and for controlling the magnets (132) via a magnet actuator (136);characterized in thatthe control device and the magnet actuator (136) are further configured so as to shift as a function of the shape control deviation at least one of the magnets in the width direction of the strip relative to at least one of the magnets on the opposite broad side of the strip and move the same into a processing position in which it is approximately opposite a trough in the actual shape of the strip.
- The coating device (100) according to claim 19,
characterized in that
the control device (160) and the magnet actuator (136) are further configured to move also the at least one magnet (132) as a function of the position control deviation of the strip (200) in the width direction. - The coating device (100) according to claim 19 or 20,
characterized in that
the control device (160) is further configured to also control the actuator (146) of the controlling roller (140) in such a manner that the strip stabilization device is operable within its operating limits. - The coating device (100) according to one of claims 19 to 21,
characterized in that
the control device (160) is further configured to set the current (1) through the at least one magnet (132) as a function of the actual shape and/or of the actual position of the strip (200) so that the setpoint shape and/or the setpoint position are ideally realized. - The coating device (100) according to one of claims 19 to 22,
characterized in that
the number of magnets (132) per broad side is uneven, for example 5 or 7.
Priority Applications (1)
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PL17754711T PL3504352T3 (en) | 2016-08-26 | 2017-08-17 | Method and apparatus for coating a metal sheet |
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DE102016216131 | 2016-08-26 | ||
DE102016222230.9A DE102016222230A1 (en) | 2016-08-26 | 2016-11-11 | Method and coating device for coating a metal strip |
PCT/EP2017/070872 WO2018036908A1 (en) | 2016-08-26 | 2017-08-17 | Method and coating device for coating a metal strip |
Publications (2)
Publication Number | Publication Date |
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EP3504352A1 EP3504352A1 (en) | 2019-07-03 |
EP3504352B1 true EP3504352B1 (en) | 2020-06-24 |
Family
ID=61166960
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP17754711.4A Active EP3504352B1 (en) | 2016-08-26 | 2017-08-17 | Method and apparatus for coating a metal sheet |
Country Status (18)
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US (2) | US11255009B2 (en) |
EP (1) | EP3504352B1 (en) |
JP (1) | JP6733047B2 (en) |
KR (1) | KR102240149B1 (en) |
CN (1) | CN109790613B (en) |
AU (1) | AU2017317465B2 (en) |
BR (1) | BR112019003801B1 (en) |
CA (1) | CA3034334C (en) |
DE (1) | DE102016222230A1 (en) |
ES (1) | ES2812818T3 (en) |
HU (1) | HUE052043T2 (en) |
MX (1) | MX2019002188A (en) |
MY (1) | MY191187A (en) |
PL (1) | PL3504352T3 (en) |
PT (1) | PT3504352T (en) |
RU (1) | RU2713523C1 (en) |
WO (1) | WO2018036908A1 (en) |
ZA (1) | ZA201900688B (en) |
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DE102022100820B3 (en) * | 2022-01-14 | 2023-02-09 | Emg Automation Gmbh | Stabilizing device and sensor structure for continuously moving metal strips |
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- 2017-08-17 WO PCT/EP2017/070872 patent/WO2018036908A1/en active Search and Examination
- 2017-08-17 PT PT177547114T patent/PT3504352T/en unknown
- 2017-08-17 MY MYPI2019000884A patent/MY191187A/en unknown
- 2017-08-17 AU AU2017317465A patent/AU2017317465B2/en active Active
- 2017-08-17 ES ES17754711T patent/ES2812818T3/en active Active
- 2017-08-17 BR BR112019003801-9A patent/BR112019003801B1/en active IP Right Grant
- 2017-08-17 HU HUE17754711A patent/HUE052043T2/en unknown
- 2017-08-17 US US16/327,876 patent/US11255009B2/en active Active
- 2017-08-17 PL PL17754711T patent/PL3504352T3/en unknown
- 2017-08-17 CA CA3034334A patent/CA3034334C/en active Active
- 2017-08-17 KR KR1020197005562A patent/KR102240149B1/en active IP Right Grant
- 2017-08-17 JP JP2019511444A patent/JP6733047B2/en active Active
- 2017-08-17 EP EP17754711.4A patent/EP3504352B1/en active Active
-
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- 2019-02-01 ZA ZA201900688A patent/ZA201900688B/en unknown
-
2021
- 2021-10-29 US US17/514,049 patent/US20220049339A1/en active Pending
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Also Published As
Publication number | Publication date |
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JP2019525008A (en) | 2019-09-05 |
PL3504352T3 (en) | 2020-11-30 |
BR112019003801A2 (en) | 2019-05-21 |
US20220049339A1 (en) | 2022-02-17 |
US11255009B2 (en) | 2022-02-22 |
EP3504352A1 (en) | 2019-07-03 |
CA3034334A1 (en) | 2018-03-01 |
WO2018036908A1 (en) | 2018-03-01 |
HUE052043T2 (en) | 2021-04-28 |
PT3504352T (en) | 2020-09-01 |
MX2019002188A (en) | 2019-06-06 |
KR102240149B1 (en) | 2021-04-14 |
ZA201900688B (en) | 2019-10-30 |
DE102016222230A1 (en) | 2018-03-01 |
CA3034334C (en) | 2022-04-26 |
KR20190039164A (en) | 2019-04-10 |
CN109790613A (en) | 2019-05-21 |
JP6733047B2 (en) | 2020-07-29 |
AU2017317465B2 (en) | 2019-10-10 |
RU2713523C1 (en) | 2020-02-05 |
ES2812818T3 (en) | 2021-03-18 |
US20190194791A1 (en) | 2019-06-27 |
CN109790613B (en) | 2021-08-31 |
AU2017317465A1 (en) | 2019-03-07 |
MY191187A (en) | 2022-06-06 |
BR112019003801B1 (en) | 2022-09-20 |
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