Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
  • B08B7/0035—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
  • B21B45/06—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing of strip 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
  • C23C2/003—Apparatus
  • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
• • 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
  • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
• • 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
  • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
  • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
• • 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
  • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
  • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
• • 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
  • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
  • C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
  • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
  • B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill

Definitions

• the invention relates to a method for descaling and / or cleaning a metal strand, in particular a hot-rolled strip made of normal steel or stainless steel, in which the metal strand is passed in a conveying direction through a device in which it is subject to plasma descaling and / or Undergoes plasma cleaning. Furthermore, the invention relates to a device for descaling and / or cleaning such a metal strand.
• JP 03207518 A A method of the generic type is known from JP 03207518 A.
• the state of the art mentioned is primarily based on the descaling of wire and pipes. This has the advantage that, due to the geometry of the material to be descaled, the electrodes can be guided relatively easily, so that descaling can be carried out efficiently.
• the invention is therefore based on the object of providing a method and an associated device for descaling and / or cleaning a metal strand, with which or with which it is possible to efficiently and even also wide metal strands over their entire width extent descaling effectively by means of plasma technology, whereby both the economic and the ecological advantages of this process should be usable.
• This object is achieved according to the invention in that the metal strand is subjected to a process in the conveying direction upstream of the device for plasma descaling and / or plasma cleaning, which gives the metal strand a high degree of flatness.
• a stretch straightening process or a stretch bending straightening process is intended.
• a tensile force can be exerted on the metal strand which has such a height that the flatness of the metal strand entering the device for plasma descaling and / or plasma cleaning is so high that the strand as flat Sheet can run through.
• the result of the descaling or cleaning is significantly improved, so that the metal strip produced is of high quality.
• the tensile force in the straightening process is selected such that a tensile stress occurs in the metal strand that corresponds to at least 10% of the yield strength of the material of the metal strand.
• the process can be operated with a continuously running metal strand; however, it is also possible to run the strand through the descaling or cleaning system discontinuously, that is to say at a non-constant speed. The latter case is particularly interesting for small plants.
• a particularly high quality of the manufactured metal strand can be achieved if the surface of the metal strand is checked after the device for plasma descaling and / or plasma cleaning; it is then provided that the speed at which the metal strand is guided through the device for plasma descaling and / or plasma cleaning is specified as a function of the test in a closed control loop in such a way that a desired descaling quality or cleaning quality is achieved.
• the descaling and / or cleaning of the metal strand can be followed by a coating of the strand with liquid metal, in particular hot-dip galvanizing.
• liquid metal in particular hot-dip galvanizing.
• Coating process application One possibility is to to lead tallstrang through a boiler that is filled with the liquid coating metal, wherein a deflection of the metal strand takes place in the boiler.
• CVGL process Continuous Vertical Galvanizing Line
• the metal strand is passed from below through a tank filled with the liquid metal, the coating metal in the tank being passed through an electromagnetic Ver - is withheld in the end.
• the metal rod is preferably heated, preferably by induction heating.
• Cold rolling of the metal strand can advantageously be carried out immediately after the descaling and / or cleaning of the metal strand.
• the device for descaling and / or cleaning the metal strand has an arrangement through which the metal strand is guided in the conveying direction and in which the metal strand is subjected to plasma descaling and / or plasma cleaning.
• the device is characterized by means with which a high degree of flatness can be imparted to the metal strand in the conveying direction before the arrangement for plasma descaling and / or plasma cleaning.
• These means consist of at least one stretch leveling or bending straightening machine.
• at least one tensioning device for generating a tensile force in the metal strand is advantageously arranged in front of and behind the means;
• the S-roll stand has proven itself as a tensioning device.
• the device for plasma descaling and / or plasma cleaning can have a treatment chamber which is under vacuum and in which a number of modularly arranged electrodes are arranged in the conveying direction of the metal strand. Provision can be made for the individual electrodes to switch on and in independently of one another depending on the degree of scaling and / or the degree of contamination of the surface of the metal strand and on the speed at which the metal strand passes the plasma device be switched off. Namely, exactly as many electrodes can be switched on during descaling or cleaning that a desired result is achieved.
• test means for checking the surface of the metal strand are arranged behind the device for plasma descaling and / or plasma cleaning; these are then connected to control means, these control means specifying the speed at which the metal strand is passed through the device as a function of the test such that a desired descaling quality or cleaning quality of the metal strand is achieved.
• the descaling or cleaning system according to the invention is advantageously used in combination with further treatment devices for the metal strand.
• Means for coating the metal strand with liquid metal in particular for hot-dip galvanizing, can be arranged in the conveying direction behind the device for plasma descaling and / or plasma cleaning. These means can have a tank for liquid metal and at least one deflection roller integrated in this.
• the means for coating can be a vessel for liquid metal and electromagnetic means for retaining the liquid under the vessel Have metal in the boiler.
• Means for heating the metal strand in particular induction heating means, can be arranged in the conveying direction behind the device for plasma descaling and / or plasma cleaning and in the conveying direction in front of the means for coating the metal strand.
• means for rolling the metal strand can be arranged in the conveying direction behind the device for plasma descaling and / or plasma cleaning; these can be a multi-stand cold rolling tandem mill.
• Continuous operation of the entire system is favored by the fact that a tape store is arranged in the conveying direction in front of the device for plasma descaling and / or plasma cleaning.
• the productivity of the system is further improved in that means for oiling the metal strand are arranged in the conveying direction behind the device for plasma descaling and / or plasma cleaning.
• FIG. 1 schematically shows a device for descaling and subsequent hot-dip galvanizing of a metal strand
• Fig. 3 shows schematically a device for descaling the metal strand.
• a device is schematically outlined in FIG. 1, with which a metal strand 1 can first be descaled and then hot-dip galvanized.
• the metal strand 1 enters the system at a predetermined conveying speed v in the conveying direction R and is first guided between two S-roll stands 5 and 6, which exert a tensile force F on the metal strand 1.
• a means 4 for straightening the metal strand 1 is arranged between the two S-roll stands 5, 6. This means 4 is a stretch bending straightening machine.
• the metal strand 1 in the stretch-bending straightening machine 4 is bent or straightened by adjustable rollers under high tension by the tensile force F such that the metal strand 1 has a high degree of flatness after it has left the stretch-bending straightening machine 4 - he has.
• the metal strand 1 is fed to the device 2 for plasma descaling or cleaning.
• This device 2 has a treatment chamber 8 which is kept under a vacuum.
• a lock 19 or 20 is provided at the entry or exit of the metal strand 1 into or out of the treatment chamber 8.
• An S-roll stand 7 is also arranged in the conveying direction behind the device 2; in cooperation with the S-roll stand 6, it is thus possible to keep the metal strand 1 under tension when passing through the device 2 (tensile force F), so that in synergy with the stretch-bending straightening machine 4 it is ensured that the metal strand 1 is the device 2 with an extremely high degree of flatness. This is necessary to achieve a good descaling or cleaning result.
• a number of electrodes 9 are arranged in the treatment chamber 8, which are required to generate the plasma with which the surface of the metal strand 1 is descaled or cleaned. Details on this can be found in the aforementioned literature.
• a plurality of electrodes 9 are arranged one behind the other. These can all be activated for descaling or cleaning at the same time. h be supplied with electrical energy. However, it is also possible to selectively switch the individual module-like electrodes 9 in such a way that only the number of electrodes that is required to achieve a desired descaling or cleaning result is activated.
• a test device 10 is arranged in the conveying direction R behind the device 2 for plasma descaling or cleaning, which is able to inspect the surface of the metal strand 1 and to pass the result of the test on to a control device 11.
• the control means 11 acts on the drive (not shown) of the overall device in such a way that the conveying speed v of the metal strand 1 is influenced in such a way that the result of the descaling or cleaning of a desired specification corresponds.
• control means 11 can reduce the conveying speed v; as a result, the surface of the metal strand 1 is exposed to a longer exposure time to the plasma, which improves the descaling or cleaning result. If, however, there is already an excessively high, unnecessary quality, the control means 11 can provide an increase in the conveying speed v, so that the quality of the descaling or cleaning is reduced, but the productivity of the overall system is increased.
• an induction heating means 14 in the conveying direction R behind the device 2 for plasma descaling or cleaning, which can heat the metal strand 1.
• this can be an inductively heated annealing furnace with a protective gas atmosphere, with which it is possible to heat the metal strand 1 to a temperature of approximately 500 ° C. in a very short time.
• the metal strand 1 is then passed under protective gas and via a trunk, not shown, into a boiler 3 with liquid coating metal.
• a deflection roller 13 is arranged in the boiler 3, which deflects the metal strand 1 vertically upward after the coating with liquid coating metal.
• the induction heating means 14, the boiler 3 and the deflection roller 13 form the schematically represented means 12 for coating the metal strand 1.
• FIG. 2 An alternative embodiment of the system can be seen in FIG. 2. The difference from FIG. 1 is that in FIG. 2, the device 2 for plasma descaling or cleaning is followed by means 15 for rolling the descaled or cleaned metal strand 1. These agents are a multi-stand cold rolling tandem mill on which the metal strand 1 is rolled to the desired final thickness.
• FIG. 3 A device is sketched in FIG. 3, which only serves to descale the metal strand 1, but which, in the manner of the solutions shown in FIGS. 1 and 2, can also be combined with subsequent devices.
• the metal strand 1 is fed in a wound form from a reel 21 to a welding machine 22, where the metal strand 1 is welded together with the preceding metal strand. Before welding, the tape ends are cut with a pair of scissors 23 to enable a perfect weld.
• the metal strand 1 is then fed to the stretch straightening machine or stretch-straightening machine 4, in which the strand 1 can be straightened by bending and applying a tensile force so that it has an optimal flatness before it enters the device 2 for plasma descaling or plasma cleaning arrives.
• the metal strand 1 passes through the lock 19, whereupon it is located in the treatment chamber 8, in which a vacuum prevails.
• the vacuum is generated by the vacuum pump 24.
• Descaling or cleaning takes place in the treatment chamber 8 by means of the plasma located between the electrodes 9 and the metal strand 1.
• the number of electrodes 9 depends on the belt speed v in order to ensure the required dwell time of the metal strand 1 in the plasma.
• the metal strand 1 runs through the vacuum lock 20 to the S-roll stand 7, which - as already explained - generates the high strip tension required for the most horizontal strip run possible in cooperation with the S-roll stand 6.
• support rollers 25 are arranged between the electrodes 9, which prevent sagging of the metal strand 1.
• the exact width of the metal strand 1 is achieved. If necessary, the metal strand 1 is then electrostatically oiled with the oiling machine 18 in order to protect the surface of the metal strand 1 from corrosion. The metal strand 1 is cut with a pair of scissors 26 before the finished bundle is pushed off. It can also have two reels 21 and 27 be worked in the inlet and outlet in order to achieve the shortest possible bund change times.
• Cold-rolled, oiled steel strip for example, must pass through special alkaline and electrolytic cleaning tanks with subsequent rinsing and sometimes also brushing before a metallic coating in order to achieve the required bare metal surface.
• Previously known systems also use chemical agents for this, which pose the environmental problems mentioned at the beginning.
• the use of plasma technology for cleaning the metal strand also brings great advantages here.
• control means 12 means for coating the metal strand

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Physics & Mathematics (AREA)
• General Chemical & Material Sciences (AREA)
• Optics & Photonics (AREA)
• Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
• Metal Rolling (AREA)
• Coating With Molten Metal (AREA)
• Cleaning In General (AREA)
• Arc Welding In General (AREA)
• Heat Treatment Of Strip Materials And Filament Materials (AREA)
• Physical Vapour Deposition (AREA)
• Exhaust Gas Treatment By Means Of Catalyst (AREA)
• Catalysts (AREA)

Priority Applications (8)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (17)

Cited By (3)

Families Citing this family (18)

Citations (3)

Family Cites Families (7)

• 2002
  • 2002-11-09 DE DE10252178A patent/DE10252178A1/de not_active Withdrawn
• 2003
  • 2003-09-29 TW TW092126771A patent/TWI316002B/zh not_active IP Right Cessation
  • 2003-09-30 AT AT03753485T patent/ATE419407T1/de active
  • 2003-09-30 DE DE50311018T patent/DE50311018D1/de not_active Expired - Lifetime
  • 2003-09-30 CA CA2505152A patent/CA2505152C/en not_active Expired - Fee Related
  • 2003-09-30 EP EP03753485A patent/EP1558779B1/de not_active Revoked
  • 2003-09-30 KR KR1020057008103A patent/KR101010580B1/ko not_active IP Right Cessation
  • 2003-09-30 AU AU2003271666A patent/AU2003271666B2/en not_active Ceased
  • 2003-09-30 CN CNB038250012A patent/CN100471981C/zh not_active Expired - Fee Related
  • 2003-09-30 ES ES03753485T patent/ES2316798T3/es not_active Expired - Lifetime
  • 2003-09-30 JP JP2004550693A patent/JP4431045B2/ja not_active Expired - Fee Related
  • 2003-09-30 PL PL374974A patent/PL207871B1/pl not_active IP Right Cessation
  • 2003-09-30 RU RU2005117797/02A patent/RU2325965C2/ru not_active IP Right Cessation
  • 2003-09-30 MX MXPA05004995A patent/MXPA05004995A/es active IP Right Grant
  • 2003-09-30 BR BR0315719-9A patent/BR0315719A/pt not_active Application Discontinuation
  • 2003-09-30 US US10/534,221 patent/US20060108034A1/en not_active Abandoned
  • 2003-09-30 WO PCT/EP2003/010852 patent/WO2004044257A1/de active Application Filing
  • 2003-11-06 MY MYPI20034255A patent/MY138080A/en unknown

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