EP3453465A1 - Kompakte intensivkühlungsvorrichtung für band in kaltwalzwerk - Google Patents

Kompakte intensivkühlungsvorrichtung für band in kaltwalzwerk Download PDF

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Publication number
EP3453465A1
EP3453465A1 EP17189898.4A EP17189898A EP3453465A1 EP 3453465 A1 EP3453465 A1 EP 3453465A1 EP 17189898 A EP17189898 A EP 17189898A EP 3453465 A1 EP3453465 A1 EP 3453465A1
Authority
EP
European Patent Office
Prior art keywords
product
coolant
header
cooling
width
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.)
Withdrawn
Application number
EP17189898.4A
Other languages
English (en)
French (fr)
Inventor
Bart Vervaet
Hugo Uijtdebroeks
Pepijn ADRIAEN
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
Original Assignee
Centre de Recherches Metallurgiques CRM ASBL
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Priority to EP17189898.4A priority Critical patent/EP3453465A1/de
Publication of EP3453465A1 publication Critical patent/EP3453465A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B21B45/02—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 lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
    • 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
    • B21B2001/221—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 by cold-rolling
    • 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
    • B21B45/02—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 lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates

Definitions

  • the present invention relates to improvements in the frame of enhanced metal strip cooling methods, and particularly in the frame of the so-called water pillow cooling (WPC) technology, to be applied in the cold rolling mill.
  • WPC water pillow cooling
  • improvements are also dedicated to avoiding the presence of coolant and dirt on the strip surface.
  • the invention also relates to the device for carrying out the method.
  • WPC Water Pillow Cooling
  • HTRC high turbulence roll cooling
  • the one-sided intensive cooling results in an efficient cooling of the entire thin strip product. This could be verified in reduced surface defect occurrence on the bottom as well as on the top surface. Moreover, because only the bottom of the strip product surface is cooled, a limited interference with the direct oil or emulsion application is realised. Furthermore, thanks to the efficient low pressure cooling technology developed by the Applicant, the reduction of electric pump energy by using WPC contributes to a lower environmental impact.
  • a direct result of the efficient strip cooling is an increased rolling speed and a decreased occurrence of temperature-related heat defects. This is especially the case for cold rolling mills which are usually producing at the limits of their capabilities.
  • a second result is a lower temperature in the roll bite to obtain enhanced lubrication properties (higher viscosity) to lower the rolling forces.
  • FIG. 3 schematically shows the effect of water being sprayed at the sides of the strip consisting in possible fallbacks draining off oil, dirt, etc. onto the strip.
  • the present invention aims at providing an efficient strip cooling at the cold rolling mill which additionally provides width-control in the cooling header.
  • the invention also aims at providing a solution to avoid the presence of (excessive) coolant and dirt on the strip surface, resulting in a cooling which is out-of-control regarding the width-aspect cooling, by reducing or preventing the above-mentioned side-sprays.
  • a first aspect of the present invention is related to a device for cooling a flat or long metallurgical product of a given width in a cold rolling mill, comprising a header provided with a means for supplying a liquid coolant, a header table comprising a plurality of nozzles arranged according to a well-defined two-dimensional pattern for creating low pressure coolant jets towards a bottom surface of the product, a means for locating said header table at short distance of the product, so as to create a homogeneous highly turbulent liquid coolant cushion at low pressure on the surface of the product in front of the header table, in the volume restricted by the product and the header table, wherein the device further comprises means for preventing coolant jets to be generated outside of the product according to the width thereof and/or for preventing such coolant jets from splashing and from falling back onto a top surface of the product.
  • the device is further limited by one or a suitable combination of the following characteristics:
  • a second aspect of the present invention relates to a method for cooling a flat or long metallurgical product in a cold rolling mill, by using the cooling device as described above, comprising the following steps:
  • the liquid coolant is an emulsion consisting essentially of water comprising an amount of oil between 0.05% and 4%, and preferably less than 1%.
  • FIG. 1 schematically shows the implementation of a WPC strip cooling system at the cold rolling mill according to the present invention.
  • Two stands (n, n+1) have been represented on FIG. 1 .
  • Each stand has two work rolls 2, and on its strip entry side, a strip lubrication system 5 provided with neat oil and a roll cooling and lubrication system by emulsion 6.
  • a roll cooling emulsion system 7 At the exit side of stand n is a roll cooling emulsion system 7, a wiping roll 3 and a tension roll 4.
  • the WPC strip cooling device 8 is also located at the exit side of the first stand n.
  • the cooling system should enable higher rolling speeds without running into temperature-related strip defects. Inevitably the necessary pump energy decreases in comparison with more conventional cooling techniques because the turbulent cooling techniques operate here at low pressure.
  • the water cushion is determined by the coolant flow and the evacuation speed of the coolant liquid. This clearly indicates that each application requires a detailed study of coolant flow and coolant performance strongly influenced by the size and geometry of the cooling headers. Also, the scope of the present invention is not restricted by the detailed engineering characteristics presented below.
  • the mill was used in the two-high configuration with a work roll 2 having a diameter of 397 mm and a Ra-roughness of 1 micron.
  • the material grade (temper 61 C) had an initial strip thickness of 1.82 mm.
  • the material width was 100 mm.
  • An entry roll cooling 13 is provided to the work rolls 2. Temperature at the entry side and the exit side of the work rolls 2 are measured by pyrometers 12. All relevant process parameters are automatically logged.
  • the specifications of the mill enable the simulation of rolling process in production mills. Coolant emulsion is applied by a recirculation system (capacity of 4000 I). Extra lubricant was applied with Direct-Application unit (DA) 11.
  • DA Direct-Application unit
  • the header 8 is provided with sideway-oriented nozzles 15 so as to partially or fully prevent that the upwards water jets next to the strip finally fall down back on the top surface (as represented on FIG. 3 in the absence of sideways-oriented nozzles).
  • This very simple solution prevents water accumulation on the strip top surface.
  • Sideways-oriented nozzles 15 are positioned either only at the side of the header 8 or can start from the middle of the header 8 to provide even better water evacuation.
  • the WPC header 8 is composed of a number of compartments or sections 21 (A, B, C, etc.), which can be each and independently “switched on or off', i.e. fed with water or not, using individual external or internal valves. This allows to easily adapt cooling to the width of the strip 1 ( FIG. 4B ).
  • a parallel moving side-plate 16 is provided on each side of the strip product 1 so that to reject back the upwards sprayed water.
  • the moving plates are following the strip width and are positioned between the WPC header 8 and the strip product 1 ( FIG. 4C ). As a result, the water jets will not hit the other parts of the mill and will not fall back on the top surface of the strip product.
  • water edge-masking plates 17 are located behind the strip product 1 and oriented/inclined so that the upwards water jets next to the sides of the strip product 1 are rejected backwards or outwards, the water being not hitting other parts of the mill and not falling back on the top surface of the strip product ( FIG. 4D ).
  • a number of orifices 18 are machined in the WPC header 8 for faster evacuation of coolant and thus for more efficient cooling ( FIG. 5 ).
  • upstanding edges 14 are provided on the sides of the table in order to create the homogeneous water pillow cushion 19 so that the water evacuation through the front and back of the WPC header 8 is delayed ( FIG. 6A ). So, a homogeneous turbulent cushion is ensured along the width of the strip. Additionally, thanks to the presence of a water pillow cushion 19, an ultrasonic cleaning mechanism 20 may be advantageously implemented inside the WPC header 8 ( FIG. 6B ).
  • a row of high pressure flat jet nozzles may be integrated in the WPC header for strip cleaning, while the low pressure WPC nozzles are used for strip cooling.
  • the high pressure nozzles are also used as a wiper so that the water can be directly and quickly evacuated.
  • the WPC nozzle pattern header 8 will be fed in a central compartment 29 by a primary coolant supply 22, while, on each side, up to three cooling zones 30 can be activated using suitable valves 25 interposed in a secondary coolant supply, a right secondary supply 23 and a left secondary supply 24.
  • the valves 25 will be chosen in order to satisfy the requirements of pressure, flow rate, controllability, durability and accessibility. Also the valves 25 need to be very compact so they can fit within the header enclosure.
  • the cooling zones 30 are inclined of an angle ranging from 0° to 30° about the moving direction of the strip.
  • FIG. 8 depicts an embodiment for a work roll cooling device 26 that is integrated in a very compact manner with the above strip cooling device 8.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
EP17189898.4A 2017-09-07 2017-09-07 Kompakte intensivkühlungsvorrichtung für band in kaltwalzwerk Withdrawn EP3453465A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17189898.4A EP3453465A1 (de) 2017-09-07 2017-09-07 Kompakte intensivkühlungsvorrichtung für band in kaltwalzwerk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17189898.4A EP3453465A1 (de) 2017-09-07 2017-09-07 Kompakte intensivkühlungsvorrichtung für band in kaltwalzwerk

Publications (1)

Publication Number Publication Date
EP3453465A1 true EP3453465A1 (de) 2019-03-13

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EP17189898.4A Withdrawn EP3453465A1 (de) 2017-09-07 2017-09-07 Kompakte intensivkühlungsvorrichtung für band in kaltwalzwerk

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3967789A1 (de) * 2020-09-11 2022-03-16 Centre de Recherches Métallurgiques ASBL - Centrum voor Research in de Metallurgie VZW Ultraschnelles beizverfahren und anlage dafür

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6068107A (ja) * 1983-09-24 1985-04-18 Kawasaki Steel Corp 熱間鋼板の冷却方法および装置
EP0542640A1 (de) * 1991-10-24 1993-05-19 United Engineering, Inc. Verfahren und Vorrichtung zum Kühlen von Walzwerkswalzen
US5701775A (en) * 1992-02-24 1997-12-30 Alcan International Limited Process and apparatus for applying and removing liquid coolant to control temperature of continuously moving metal strip
JP2005021984A (ja) * 2003-06-13 2005-01-27 Jfe Steel Kk 厚鋼板の制御冷却方法及び装置
WO2008104037A1 (fr) 2007-02-09 2008-09-04 Centre De Recherches Metallurgiques Asbl-Centrum Voor De Research In De Metallurgie Vzw Dispositf et procede de refroidissement de cylindres de laminage en regime hautement turbulent
JP2011131248A (ja) * 2009-12-25 2011-07-07 Jfe Steel Corp 熱延鋼帯の下面冷却装置
US20120235331A1 (en) * 2011-03-18 2012-09-20 Rejean Lemay Method and apparatus for removing coolant liquid from moving metal strip
WO2014167138A1 (en) 2013-04-12 2014-10-16 Centre de Recherches Métallurgiques asbl - Centrum voor Research in de Metallurgie vzw Method and device for enhanced strip cooling in the cold rolling mill

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6068107A (ja) * 1983-09-24 1985-04-18 Kawasaki Steel Corp 熱間鋼板の冷却方法および装置
EP0542640A1 (de) * 1991-10-24 1993-05-19 United Engineering, Inc. Verfahren und Vorrichtung zum Kühlen von Walzwerkswalzen
US5701775A (en) * 1992-02-24 1997-12-30 Alcan International Limited Process and apparatus for applying and removing liquid coolant to control temperature of continuously moving metal strip
JP2005021984A (ja) * 2003-06-13 2005-01-27 Jfe Steel Kk 厚鋼板の制御冷却方法及び装置
WO2008104037A1 (fr) 2007-02-09 2008-09-04 Centre De Recherches Metallurgiques Asbl-Centrum Voor De Research In De Metallurgie Vzw Dispositf et procede de refroidissement de cylindres de laminage en regime hautement turbulent
US20100089112A1 (en) 2007-02-09 2010-04-15 Centre De Recherches Metallurgiques Asbl Device and Method for Cooling Rollers Used for Rolling in a Highly Turbulent Environment
JP2011131248A (ja) * 2009-12-25 2011-07-07 Jfe Steel Corp 熱延鋼帯の下面冷却装置
US20120235331A1 (en) * 2011-03-18 2012-09-20 Rejean Lemay Method and apparatus for removing coolant liquid from moving metal strip
WO2014167138A1 (en) 2013-04-12 2014-10-16 Centre de Recherches Métallurgiques asbl - Centrum voor Research in de Metallurgie vzw Method and device for enhanced strip cooling in the cold rolling mill

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3967789A1 (de) * 2020-09-11 2022-03-16 Centre de Recherches Métallurgiques ASBL - Centrum voor Research in de Metallurgie VZW Ultraschnelles beizverfahren und anlage dafür
WO2022053515A1 (en) * 2020-09-11 2022-03-17 Centre De Recherche Metallurgiques Asbl -Centrum Voor Research In De Metallurgie Vzw Ultrafast pickling method and installation therefor

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