EP2813298A1 - Verfahren und Vorrichtung zur verbesserten Streifenkühlung im Kaltwalzwerk - Google Patents

Verfahren und Vorrichtung zur verbesserten Streifenkühlung im Kaltwalzwerk Download PDF

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Publication number
EP2813298A1
EP2813298A1 EP13171182.2A EP13171182A EP2813298A1 EP 2813298 A1 EP2813298 A1 EP 2813298A1 EP 13171182 A EP13171182 A EP 13171182A EP 2813298 A1 EP2813298 A1 EP 2813298A1
Authority
EP
European Patent Office
Prior art keywords
product
cooling
strip
cold rolling
cooling device
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Withdrawn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
EP13171182.2A
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English (en)
French (fr)
Inventor
Bart Vervaet
Hugo Uijtdebroeks
Leonardus Jacobs
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 EP13171182.2A priority Critical patent/EP2813298A1/de
Priority to PCT/EP2014/057519 priority patent/WO2014167138A1/en
Publication of EP2813298A1 publication Critical patent/EP2813298A1/de
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems

Definitions

  • the present invention relates to an enhanced metal strip cooling method, and particularly to the so-called water pillow cooling (WPC) technology, to be applied in the cold rolling mill.
  • WPC water pillow cooling
  • the invention also relates to the device for carrying out the method.
  • WPC water pillow cooling
  • HTRC high turbulence roll cooling
  • strip cooling is extensively used in various hot rolling conditions in order to obtain well-defined metallurgical properties (e.g. harder grade steels), up to now intensive strip cooling was not considered critical in cold rolling operations.
  • strip cooling only consists in applying roll coolant further flowing on the strip or in using an additional row of nozzles spraying on the strip. The necessity to improve cooling performance in order to suppress temperature related defects is however recognized.
  • heat scratch As mentioned above, there are a few surface defects in cold rolling that can directly be related to high roll and/or strip temperature. More precisely, by far the most well-known is heat scratch. Other defects are related to the application of the coolant. An example of these defects is chatter, which can be due to coolant disturbance of the oil film layer and thereby of the coefficient of friction in the roll bite. Heat scratches (also called heat streaks) are surface defects that often occur in cold rolling with high reductions, so it is often found in tinplate rolling. Heat scratches are formed when the lubrication film breaks down.
  • the present invention aims at providing an efficient strip cooling at the cold rolling mill which, associated to efficient roll cooling, results in an increased rolling speed together with a decreased occurrence of temperature related heat defects.
  • the invention also aims at obtaining a lower temperature in the roll bite to obtain enhanced lubrication properties (or higher viscosity) and reduced scattering defects.
  • the invention also aims, thanks to using an efficient low pressure cooling technology developed by the Applicant, at reducing electric pump energy and further at contributing to lower environmental impact.
  • a first aspect of the present invention is related to a device for cooling a flat or long metallurgical product in a cold rolling mill, by creating a highly turbulent liquid coolant cushion at low pressure, comprising a header made of one or more compartments, each compartment being provided with a means for supplying the liquid coolant and with an internal surface to be located at a short distance of the product, said internal surface comprising a plurality of nozzles or bore holes arranged according to a well-defined two-dimensional pattern.
  • the device for cooling a flat or long metallurgical product in a cold rolling mill is further limited by one or a suitable combination of the following characteristics:
  • a second aspect of the present invention relates to a cold rolling mill, comprising at least a rolling stand with a pair of work rolls and a product cooling device according to the invention, wherein the product cooling device is located at the entry or exit side of the work rolls.
  • the cold rolling mill is further limited by one or a suitable combination of the following characteristics:
  • a third aspect of the invention relates to a method for cooling a flat or long metallurgical product in a cold rolling mill, by using the cooling device of the invention, comprising the following steps:
  • the gap between the cooling device and the product, the pressure of the liquid coolant and the specific flow rate are adjusted so that the temperature of the product on the exit side of the work rolls of the rolling stands does not exceed 170°C.
  • FIG. 1 schematically represents the principle of WPC strip cooling applied to the cold rolling mill.
  • FIG. 2A schematically represents a design of WPC strip cooling header according to the present invention.
  • FIG. 2B shows a static test using a transparent strip.
  • FIG. 3A schematically represents flow patterns versus specific flow rates.
  • FIG. 3B represents the flow rates obtained with the WPC strip prototype header (lower view).
  • FIG. 4 is an example of schematic layout for the experimental setup according to the invention.
  • FIG. 5A represents the impact of the WPC strip cooling on the rolling force and the strip temperature out and FIG. 5B represents the corresponding influence on the strip surface quality (lower views).
  • FIG. 6 represents an example of impact of cooling flow rate on the exit thickness.
  • FIG. 7 is a compared calculation of the friction coefficient with and without strip cooling.
  • 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 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 should decrease because the turbulent cooling techniques operate at low pressure. This has been simulated in the experimental tests described below to determine the optimum parameters.
  • the Applicant has constructed a WPC strip cooling prototype ( FIG. 2A ) that has been tested in a cold rolling pilot line.
  • This prototype header 8 is designed with similar dimensions as it would be implemented in a corresponding industrial cold rolling mill (but only with a much smaller width).
  • the strip cooling unit 8 that was designed for the pilot line experiments is internally divided in three chambers 9. Each chamber 9 can be "switched on” or “switched off” (i.e. fed or not with coolant) during use, thanks to its main feeding pipe 10.
  • the surface of the header 8 facing the strip 1 is provided by a specific pattern of nozzles 11. These nozzles 11 that are used in the unit are designed to be easily changed, according to different sizes. For example, nozzle diameters of 2, 3 and 4 mm were used during the test.
  • the flow rate control was achieved with a pump-unit, at a maximum flow rate of 350 l/min. Offline tests were performed on the Applicant cooling simulation platform, which comprises a static transparent plate 18 ( FIG. 2B ).
  • cooling pattern of the different cooling sprays was monitored with their specific flow ( FIG. 3A ) to see the WPC coverage pattern.
  • Different nozzles sizes and pressures were selected in order to meet the industrial available flow rates ( FIG. 3B ). According to the specific flow and experience from other WPC implementations, it was stated that a sufficient cooling should be reached during the cold rolling pilot line tests performed on the industrial multi-mill.
  • the mill was used in the two-high configuration with a work roll 2 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 16 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 15. 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) 14.
  • DA Direct-Application unit
  • the second pass was under focus since this pass is especially known to be critical for heat scratches.
  • the first pass was rolled without lubrication and entry/exit cooling in order to put some temperature in the strip.
  • the only lubrication was obtained from the oil on the strip from the pickling line.
  • the thickness of the strip after first pass was 1 mm.
  • the coil was then rewound.
  • the second pass was rolled with DA-lubrication and entry roll cooling was used in order to simulate real rolling conditions. Reductions of the second pass varied between 45% and 60%. Entry and exit tension-force were typically 20 and 12 kN, respectively.
  • the oil loses very quickly its lubricating properties above this critical temperature.
  • the scratches that were observed during some of the experiments were also made when the strip exit temperature was above 170°C. It is remarkable that the COF as a function of the measured strip temperature has a better defined line for the experiments where the strip cooling unit was used. Probably, this is related to the fact that using the strip cooling unit gives a very well defined entry strip temperature. If the strip cooling unit is not used, the strip entry temperature depends on the time between pass 1 and 2 which is obviously variable in an experimental surrounding.
  • the oil present in the emulsion increases the plate-out of the strip surface due to the turbulence of the emulsion at the strip surface. 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.
EP13171182.2A 2013-04-12 2013-06-10 Verfahren und Vorrichtung zur verbesserten Streifenkühlung im Kaltwalzwerk Withdrawn EP2813298A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13171182.2A EP2813298A1 (de) 2013-06-10 2013-06-10 Verfahren und Vorrichtung zur verbesserten Streifenkühlung im Kaltwalzwerk
PCT/EP2014/057519 WO2014167138A1 (en) 2013-04-12 2014-04-14 Method and device for enhanced strip cooling in the cold rolling mill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13171182.2A EP2813298A1 (de) 2013-06-10 2013-06-10 Verfahren und Vorrichtung zur verbesserten Streifenkühlung im Kaltwalzwerk

Publications (1)

Publication Number Publication Date
EP2813298A1 true EP2813298A1 (de) 2014-12-17

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EP13171182.2A Withdrawn EP2813298A1 (de) 2013-04-12 2013-06-10 Verfahren und Vorrichtung zur verbesserten Streifenkühlung im Kaltwalzwerk

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EP (1) EP2813298A1 (de)
WO (1) WO2014167138A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113245379A (zh) * 2021-05-10 2021-08-13 江苏申源集团有限公司 加工易切削抗高温粘结性不锈钢的多道温度处理扎制设备

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106909723B (zh) * 2017-02-16 2020-03-31 燕山大学 冷轧过程乳化液流量与轧制速度关系曲线优化设定方法
EP3453465A1 (de) 2017-09-07 2019-03-13 Centre de Recherches Métallurgiques ASBL - Centrum voor Research in de Metallurgie VZW Kompakte intensivkühlungsvorrichtung für band in kaltwalzwerk
DE102018219276A1 (de) 2018-03-12 2019-09-12 Sms Group Gmbh Kühlgruppe einer Laminarkühlvorrichtung
CA3091392A1 (en) * 2018-06-13 2019-12-19 Novelis Inc. Hybrid rolling mill

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5944607U (ja) * 1982-09-16 1984-03-24 川崎製鉄株式会社 冷間圧延材の通板ガイド
US5697169A (en) * 1996-11-12 1997-12-16 Busch Co. Apparatus for cooling strip and associated method
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
DE102007055475A1 (de) * 2007-06-27 2009-01-08 Sms Demag Ag Kühlvorrichtung zum Kühlen eines Metallbandes

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Publication number Priority date Publication date Assignee Title
JPS58167012A (ja) * 1982-03-29 1983-10-03 Nippon Kokan Kk <Nkk> 冷間圧延設備における形状制御装置
DE69322379T2 (de) * 1992-02-24 1999-04-29 Alcan Int Ltd Verfahren zum aufbringen und entfernen von kühlflüssigkeit zur temperaturkontrolle eines kontinuierlich bewegten metallbandes
CN103889605B (zh) * 2011-08-30 2017-01-18 首要金属科技奥地利有限责任公司 可逆式轧机和用于可逆式轧机的运行方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5944607U (ja) * 1982-09-16 1984-03-24 川崎製鉄株式会社 冷間圧延材の通板ガイド
US5697169A (en) * 1996-11-12 1997-12-16 Busch Co. Apparatus for cooling strip and associated method
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
DE102007055475A1 (de) * 2007-06-27 2009-01-08 Sms Demag Ag Kühlvorrichtung zum Kühlen eines Metallbandes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113245379A (zh) * 2021-05-10 2021-08-13 江苏申源集团有限公司 加工易切削抗高温粘结性不锈钢的多道温度处理扎制设备

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