EP1728888A1 - Vorrichtung zur pneumatischen Stabilisierung eines kontinuierlich laufenden Metallbandes - Google Patents

Vorrichtung zur pneumatischen Stabilisierung eines kontinuierlich laufenden Metallbandes Download PDF

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Publication number
EP1728888A1
EP1728888A1 EP06447053A EP06447053A EP1728888A1 EP 1728888 A1 EP1728888 A1 EP 1728888A1 EP 06447053 A EP06447053 A EP 06447053A EP 06447053 A EP06447053 A EP 06447053A EP 1728888 A1 EP1728888 A1 EP 1728888A1
Authority
EP
European Patent Office
Prior art keywords
strip
cavity
slots
band
passive
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
Application number
EP06447053A
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English (en)
French (fr)
Other versions
EP1728888B1 (de
Inventor
Olivier Bregand
Jean Crahay
Arnaud Hennion
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Centre de Recherches Metallurgiques CRM ASBL
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Centre de Recherches Metallurgiques CRM ASBL
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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
    • C23C2/003—Apparatus
    • 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 present invention relates to a dissipative pneumatic device for stabilizing a metal strip in continuous scrolling through wipers after a dip coating operation.
  • the invention relates more particularly to the field of hot dip galvanizing of a steel strip in continuous motion.
  • the pneumatic stabilization of the strip is effected at the outlet of the bath of liquid metal, in the vicinity of the wiper device.
  • dip coating constitutes a method that is both simple and effective for depositing a coating on the surface of an object.
  • the object to be coated is immersed in a bath comprising the product that is to be deposited on said object.
  • the object is then removed from the bath with removal of the excess liquid and the coating is made solid, for example by drying, solidification, polymerization, etc.
  • the coated strip After passing through the liquid metal bath, the coated strip undergoes the spinning operation.
  • This operation is one of the most important in the dip coating process because it allows control of the final coating thickness.
  • the spin must be homogeneous over the entire "section", that is to say the width for a band and the circumference for a wire, and the entire length of the product to be coated.
  • this operation must strictly limit the deposit to the target value, which is usually expressed either in terms of thickness deposited - typically from 3 to 20 ⁇ m - or by weight of the deposited layer per unit surface area - typically in gr / m 2 .
  • the spin is generally performed by means of blades or linear gas jets in the case of strips and circular in the case of son from slots and usually directed perpendicular to the surface to be treated.
  • the gas blades act as "pneumatic scrapers” and have the advantage of operating without mechanical contact and therefore without the risk of scratching the treated object.
  • Such blades are called “gas wipers” or “spin knives”.
  • the pressurized gas used is either air or a neutral gas such as nitrogen in the most delicate applications such as the treatment of steel strips intended for the manufacture of visible parts for the automobile bodywork. .
  • the thickness of the coating depends in particular on the one hand of the distance between the band and the spinning knives and, on the other hand, the pressure exerted by the jet of compressed gas on the band.
  • the document JP-A-56 153136 proposes to have at least one pair of pneumatic stabilizers or dampers at positions such that the distance between the two rolls, that is to say the bottom roll and the top roll, which are fixed points for the band, in a number 1 / (n + 1), the number n being an integer ranging from 1 to 6 or 0, or to several positions separated by more than one meter from the two aforementioned fixed points.
  • the static pressure between the pneumatic stabilizer and the belt is maintained between 30 and 50 mm of water column.
  • the document JP-A-56 084452 proposes the use of a pneumatic stabilizer in which a part of the injected fluid flows along the strip in the direction opposite to that coming from the wipers.
  • the collision of the two jets makes it possible to increase the static pressure of the stabilizer as well as of its application surface.
  • the main disadvantage of this type of system is that the stabilizer acts essentially as a compression spring, which tends to cause the band to pass through a fixed point. It follows that the vibration spectrum of the band, and in particular its natural frequency, can be modified without, however, significantly reducing the overall vibrational energy involved. We can notably observe an increase in the amplitude of the modes of vibration of which the nodes are located at the level of the stabilizer. This type of stabilizer is thus not able to prevent the appearance of resonance phenomena.
  • Electromagnetic methods are based on the following principle. Conductors in which a high frequency current flows are installed on both sides of the steel strip. They induce in the band currents in phase opposition, the eddy currents. The interaction between the inductive currents and the induced eddy currents generates a magnetic pressure tending to stabilize the steel strip. Another solution is to use electromagnets. However, methods of this type imply additional control because of the magnetic attraction force, which tends to make the band unstable. Furthermore, it is known that the high frequency currents used cause a rise in temperature in the band, which is contrary to what is sought in this step of the process.
  • the object of the present invention is to propose a solution to the problem of stabilizing a metal strip in continuous scrolling which makes it possible to overcome the drawbacks of the state of the art.
  • the present invention aims to stabilize the strip at the exit of the liquid metal bath through pneumatic means, passive or active, which allow to dissipate the vibration energy generated in the band by the installation.
  • the invention also aims to avoid the implementation of additional gas jets in the immediate vicinity of the wipers that could affect the appearance of the final product.
  • the invention also pursues the goal of being compatible with the cooling of the band required at the exit of the coating bath by hot dipping.
  • a first object of the present invention set forth in claim 1, relates to a dissipative device for pneumatically stabilizing a metal strip in continuous scrolling, in the form of a box comprising at least two slots, for blowing a tube. pressurized gas on at least one side of the strip, which extend transversely substantially across the width of the strip, separated by a distance in the longitudinal direction and substantially parallel to each other, characterized in that the box further comprises in the space between two successive slots, a cavity closed by a rear wall and side walls, open at the front, facing the strip and limited in the longitudinal direction at least by said slots.
  • Claims 17 to 27 relate to methods for carrying out the various preferred embodiments of the above-mentioned stabilizing device, including preferred methods of these different methods.
  • Figure 1 shows a vertical sectional view of the pneumatic stabilization device of a passive damping metal strip according to the present invention.
  • FIG. 2 represents a corresponding elevational view of the device of FIG. 1.
  • FIG. 3 represents a vertical sectional view of the pneumatic stabilization device of an active damping metal strip according to the present invention.
  • Figures 4 and 5 show a sectional view of two preferred embodiments of the invention as an alternative to the pneumatic stabilization device of a passive damping metal strip shown in Figure 1.
  • FIG. 1 shows a preferred embodiment of the device of the invention arranged in front of the steel strip 1 in continuous upward movement, after passage through the bottom roller 4 of the liquid zinc bath. 2 and after spin 3.
  • the device of the invention is essentially in the form of a box 5 having on its front face at least two slots 6 oriented towards the band 1, by which is blown a compressed gas for maintaining a pressure greater than ambient atmospheric pressure between the front face of said device and the strip. Between these two slots is arranged a cavity 7 in the box, said cavity being either completely open or partially obstructed on the side of the strip 1 by a grid, that is to say a plate 8 provided with openings 8 '.
  • This cavity 7 serves to dissipate the vibration energy of the strip essentially by a viscosity effect of the gas.
  • the number and shape of the openings 8 ' makes it possible to modulate the dissipation of energy.
  • the objective pursued by the installation of the grid 8, 8 ' is to create a controlled loss of local load.
  • the width of the slots 6 must be significantly smaller than the width of the cavity 7 (for example 10 times smaller).
  • the slots 6 will have a trumpet-shaped end making it possible to exploit the Coanda effect or gluing effect, making it possible to eject the fluid over a larger strip surface than a usual slot with sharp edges.
  • this type of shape makes it possible to very greatly reduce the pressure gradient at the level of the strip, in front of each slot, where a very large pressure gradient is observed with the slots that are usually used.
  • the latter can be equipped with a wall movable rear 9.
  • the wall 9 is connected to a dissipative energy system 10 consisting essentially of a spring and a damper (of the dash-pot type ).
  • the damping system is adjusted so as to damp the vibrations of the band in a frequency range between 1 and n times the natural frequency of the band (n integer).
  • a device for measuring the movement of the strip drives a displacement of the movable wall 9.
  • a device for measuring the movement of the strip is composed of at least one sensor 11 and an actuator 12 controlled by a control system 13.
  • the displacement, the speed or the acceleration of the band 1 are measured by the (or) sensor (s) 11.
  • the signal of the sensor is transmitted to the controller input 13.
  • the output of the controller 13 is connected to the actuator 12.
  • the latter converts the control signal which it receives, preferably according to an open or closed loop control law, into a mechanical force applied to the actuator 12.
  • movable wall 9 Thus the active element reacts to the initial vibration by generating a reaction force so as to cancel or attenuate this vibration.
  • the regulation is parameterized so as to optimize the damping at the mobile wall 9.
  • the senor 11 is a non-contact distance sensor of the laser triangulation type, the actuator 12 being an electromagnetic jack.
  • Figures 4 and 5 show other advantageous embodiments of the pneumatic stabilization device of a metal strip according to the present invention. These methods of execution can be used both in the context of a passive damping system and in that of an active damping system.
  • the cavity 7 in the box 5 and the gas supply ducts compressed by the slots 6 do not form two separate elements.
  • a second inner box (or shoe) 5 ' having a front face in the form of a plate 18 full, that is to say without holes such as the orifices 8' shown on the Figures 1 to 3.
  • the shoe 5 ' can move in the direction perpendicular to the strip 1.
  • this box 5' was connected at the rear to a dissipative energy system 10 (passive depreciation). However, it can also be used in an active damping system as described above.
  • the gas injection ducts 6 ' are formed in part by the side walls 17' of the box 5 ', which makes it possible to modulate the passage section of these ducts when the box 5' moves relative to the strip.
  • the entire box 5 ' is movable and not only a rear wall located in the cavity 7 as in Figures 1 to 3.
  • the box 5 ' is fixed and has a conduit 7' passing right through its center and opening at an opening 18 'on the front face 18 of the box 5' .
  • This duct may be obstructed at the rear by an element such as a sphere 37 integral with the dissipative system 10.
  • the increase in the pressure of compressed gas in this duct under the effect of the movements of the band 1 may cause the separation shutter 37 of the rear end of the duct, which allows the injection of gas to the band also through the central duct 7 'which is then connected to the supply system.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Advancing Webs (AREA)
EP06447053A 2005-06-02 2006-04-13 Vorrichtung zur pneumatischen Stabilisierung eines kontinuierlich laufenden Metallbandes Not-in-force EP1728888B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE2005/0277A BE1016623A4 (fr) 2005-06-02 2005-06-02 Dispositif pour la stabilisation pneumatique d'une bande metallique en defilement continu.

Publications (2)

Publication Number Publication Date
EP1728888A1 true EP1728888A1 (de) 2006-12-06
EP1728888B1 EP1728888B1 (de) 2008-08-13

Family

ID=35431126

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06447053A Not-in-force EP1728888B1 (de) 2005-06-02 2006-04-13 Vorrichtung zur pneumatischen Stabilisierung eines kontinuierlich laufenden Metallbandes

Country Status (5)

Country Link
EP (1) EP1728888B1 (de)
AT (1) ATE404707T1 (de)
BE (1) BE1016623A4 (de)
DE (1) DE602006002174D1 (de)
ES (1) ES2312103T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114411079A (zh) * 2022-01-10 2022-04-29 山东恩光新材料有限公司 一种带有稳定板子的风冷冷却装置

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55110766A (en) * 1979-02-16 1980-08-26 Nippon Steel Corp Wiping device for molten metal plating equipment
JPS5684452A (en) 1979-12-14 1981-07-09 Nippon Steel Corp Prevention of vibration of strip
JPS56153136A (en) 1980-04-30 1981-11-27 Nippon Steel Corp Noncontact type vibration damping method for strip
JPS57101657A (en) * 1980-12-18 1982-06-24 Nippon Steel Corp Apparatus for wiping molten plating
JPH051362A (ja) 1991-06-25 1993-01-08 Nkk Corp 連続通板する鋼板の振動および板反り防止方法
JPH0810847A (ja) 1994-06-28 1996-01-16 Mitsubishi Heavy Ind Ltd ストリップの形状矯正・制振装置
JPH09143652A (ja) 1995-11-16 1997-06-03 Kawasaki Steel Corp 溶融金属めっきラインにおける金属ストリップの振動防止方法およびその装置
JPH1087755A (ja) 1996-09-19 1998-04-07 Mitsubishi Chem Corp グラフト共重合樹脂の製造方法
JPH10298728A (ja) 1997-04-23 1998-11-10 Nkk Corp 鋼板の振動・形状制御方法
GB2334351A (en) * 1998-02-11 1999-08-18 British Steel Plc Controlling transverse motion in a web
JP2003013193A (ja) * 2001-07-02 2003-01-15 Nkk Corp 溶融亜鉛系めっき鋼板の製造方法

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55110766A (en) * 1979-02-16 1980-08-26 Nippon Steel Corp Wiping device for molten metal plating equipment
JPS5684452A (en) 1979-12-14 1981-07-09 Nippon Steel Corp Prevention of vibration of strip
JPS56153136A (en) 1980-04-30 1981-11-27 Nippon Steel Corp Noncontact type vibration damping method for strip
JPS57101657A (en) * 1980-12-18 1982-06-24 Nippon Steel Corp Apparatus for wiping molten plating
JPH051362A (ja) 1991-06-25 1993-01-08 Nkk Corp 連続通板する鋼板の振動および板反り防止方法
JPH0810847A (ja) 1994-06-28 1996-01-16 Mitsubishi Heavy Ind Ltd ストリップの形状矯正・制振装置
JPH09143652A (ja) 1995-11-16 1997-06-03 Kawasaki Steel Corp 溶融金属めっきラインにおける金属ストリップの振動防止方法およびその装置
JPH1087755A (ja) 1996-09-19 1998-04-07 Mitsubishi Chem Corp グラフト共重合樹脂の製造方法
JPH10298728A (ja) 1997-04-23 1998-11-10 Nkk Corp 鋼板の振動・形状制御方法
GB2334351A (en) * 1998-02-11 1999-08-18 British Steel Plc Controlling transverse motion in a web
JP2003013193A (ja) * 2001-07-02 2003-01-15 Nkk Corp 溶融亜鉛系めっき鋼板の製造方法

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 004, no. 173 (C - 032) 29 November 1980 (1980-11-29) *
PATENT ABSTRACTS OF JAPAN vol. 005, no. 152 (C - 073) 25 September 1981 (1981-09-25) *
PATENT ABSTRACTS OF JAPAN vol. 006, no. 036 (M - 115) 5 March 1982 (1982-03-05) *
PATENT ABSTRACTS OF JAPAN vol. 006, no. 186 (C - 126) 22 September 1982 (1982-09-22) *
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 05 12 May 2003 (2003-05-12) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114411079A (zh) * 2022-01-10 2022-04-29 山东恩光新材料有限公司 一种带有稳定板子的风冷冷却装置
CN114411079B (zh) * 2022-01-10 2023-01-24 山东恩光新材料有限公司 一种风冷冷却装置

Also Published As

Publication number Publication date
EP1728888B1 (de) 2008-08-13
ATE404707T1 (de) 2008-08-15
BE1016623A4 (fr) 2007-03-06
DE602006002174D1 (de) 2008-09-25
ES2312103T3 (es) 2009-02-16

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