WO2014135316A1 - Dispositif et procédé de refroidissement - Google Patents

Dispositif et procédé de refroidissement Download PDF

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Publication number
WO2014135316A1
WO2014135316A1 PCT/EP2014/051942 EP2014051942W WO2014135316A1 WO 2014135316 A1 WO2014135316 A1 WO 2014135316A1 EP 2014051942 W EP2014051942 W EP 2014051942W WO 2014135316 A1 WO2014135316 A1 WO 2014135316A1
Authority
WO
WIPO (PCT)
Prior art keywords
coolant
liquid
gas supply
work roll
nozzle
Prior art date
Application number
PCT/EP2014/051942
Other languages
English (en)
Inventor
Peter Christoforou
Original Assignee
Siemens Plc
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 Siemens Plc filed Critical Siemens Plc
Priority to EP14703047.2A priority Critical patent/EP2964405A1/fr
Priority to BR112015020789A priority patent/BR112015020789A2/pt
Priority to CN201480012462.3A priority patent/CN105121045A/zh
Publication of WO2014135316A1 publication Critical patent/WO2014135316A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
    • B21B37/32—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control by cooling, heating or lubricating the rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/18—Roll crown; roll profile
    • B21B2267/19—Thermal crown

Definitions

  • the objective of the invention is to provide for a simpler and more reliable method of controlling the cooling when using cryogenic coolants.
  • the effect of operating conditions on the work roll profile may be controlled in comparison with reference data to allow the cooling power to be adjusted as necessary.
  • the data comprises rolled strip flatness measurements.
  • the method comprises deriving data relating to the work roll profile using feedback from a strip flatness sensor and flatness control system in a controller; and thereafter controlling the gas supply to the coolant.
  • the method further comprises controlling a mark-space ratio of a control mechanism of the gas supply to adjust the cooling according to the cooling requirement.
  • the coolant supply is divided into zones, each zone having multiple nozzles and a common gas supply, whereby all nozzles in each zone provide coolant to the workroll in the same manner.
  • Using a common gas supply to a plurality of nozzles in a zone ensures that the coolant supplied from all the nozzles in that zone is in the form of an atomised spray, or remains as liquid coolant, rather than some nozzles in a zone supplying liquid and other nozzles in the same zone supplying an atomised spray. This gives better profile control.
  • the coolant supply is divided into zones, each zone having multiple nozzles and two or more gas supplies, whereby, within a zone coolant from at least one nozzle is atomized.
  • a cooling device for one or more work rolls of a rolling mill comprises a nozzle to receive a cryogenic coolant; a fluid outlet from the nozzle for supplying the cryogenic coolant to a surface of the work roll; a gas supply; and a controller for controlling supply of gas from the gas supply to the cryogenic coolant, whereby the device is adapted to supply a liquid directly to the surface of the work roll, or to spray an atomised liquid at the surface of the work roll.
  • the device further comprises at least one sensor for providing feedback to the controller of the effect of the cooling power at the surface of the work roll.
  • the senor comprises a strip flatness measuring device.
  • the cryogenic coolant comprises liquid nitrogen.
  • Figure 1 illustrates a conventional spray nozzle to supply coolant to the surface of a work roll
  • Figure 2 illustrates an arrangement in which a multiple nozzle header may be used with a cryogenic valve and source of cryogenic liquid
  • Figure 4 illustrates a second example of a cooling device according to the present invention
  • Figure 5 shows how the temperature of a rotating steel work roll changes with time using the cooling device of Fig.3;
  • Figure 6 illustrates the cooling device of Fig.3 and 4 in situ with work rolls of a rolling mill.
  • Fig.1 illustrates a conventional spray system for cooling a work roll in an aluminium rolling mill, e.g. using either kerosene or cryogenic liquid as the coolant.
  • a steel work roll 1 is mounted on an axis 2 for rotation in anti-clock wise direction 3 or clockwise direction 4.
  • a flow of liquid from a supply header 5 which receives the liquid via pipes and valves (not shown), passes through a valve 10 and into a spray nozzle header 9 and then through nozzles 6 which produce jets 7 which spray the liquid onto a surface 8 of the work roll.
  • the supply header 5 usually supplies all of the zones across the width of the roll and there is at least one valve 10, zone header 9 and nozzle 6 for each cooling zone.
  • the jets 7 may be flat jet type, or cone type, or column jets.
  • the valve 10 may be either a proportional type valve such as the valve described in US4081141 which adjusts the flow over a range of values, or the valve could be an on-off type valve.
  • proportional type flow control valves One problem with proportional type flow control valves is that as the flow is reduced the pressure on the outlet side of the valve is also reduced. The change in pressure alters the spray pattern 7 and this causes problems with controlling the cooling particularly at low flows where the spray pattern 7 may not contact the roll surface 8 properly.
  • An additional problem with cryogenic coolants is that the pressure drop across a proportional valve tends to create a lot of gas which changes the cooling effect. For this reason most systems use on-off valves because the spray pattern when the spray is switched on is more consistent.
  • a common method of controlling the cooling using on-off valves is to pulse the sprays and to control the mark-space ratio as described in GB2156255.
  • An alternative method is to have several valves within each zone where each valve supplies a different sized nozzle as described in GB2012198. Different combinations of nozzles can therefore be selected to adjust the total cooling flow.
  • Valves which are used in the water or kerosene based cooling systems are unsuitable for use with cryogenic liquids because the valves need to be able to operate with cryogenic fluids at very low temperatures and achieve a high number of cycles.
  • the fatigue life of materials at very low temperatures results in the valves failing in a relatively short space of time.
  • US20080048047 describes a method of controlling the flow rate of a cryogenic liquid through a cryogenic nozzle in which a throttling gas at a pressure greater than or equal to the pressure of the cryogenic liquid is used to control the cryogenic liquid flow rate.
  • a throttling gas at a pressure greater than or equal to the pressure of the cryogenic liquid is used to control the cryogenic liquid flow rate.
  • An increase in gas pressure reduces the mass flow rate of the liquid.
  • the liquid flow rate from nozzles near the centre of the tube may be greater than the liquid flow rate from nozzles at the ends.
  • the Leidenfrost effect causes the atomised liquid droplets coming into contact with a much hotter surface to form a layer of vaporised gas between the surface and the droplets, reducing the cooling effect of the liquid droplets.
  • a jet of cryogenic liquid is sufficiently powerful to pass through the vaporised gas layer.
  • FIG.4 A second embodiment of the present invention is illustrated in Fig.4.
  • the coolant comprising cryogenic liquid 20 from a cryogenic header 21 passes through an orifice 22 in an atomising nozzle 23.
  • the orifice 22 produces a conventional liquid spray pattern on the work roll surface 8, such as a column type jet or a cone type jet.
  • the gas supply is switched on and gas 24 passes through inlets 29 to exits 30 leading into the orifice 22, so that the gas comes into contact with the liquid 20 which has passed through a first part of the orifice 22 to reach that point 30.
  • Fig.6 illustrates use of atomising nozzles of the present invention, such as the embodiments of Figs.3 and 4, in a rolling mill.
  • a metal strip 50 to be rolled passes through the nip of work rolls 8, which have corresponding back-up rolls 52.
  • the rolled strip then passes over guide rolls 53.
  • a cooling system comprising atomising nozzles 23 is supplied with cryogenic liquid from a store 54 controlled by a valve 56 set on a constant setting, via cryogenic header 21 and pipes 22. The cooling may be provide both above and below the strip 50.
  • a gas store 57 supplies gas 24 to the nozzles 23 through individual control valves 58 under control of controller 59 via control line 63.
  • the cooling device of the present invention not only controls whether liquid, or atomised spray, or even only control gas at sufficiently high pressure, reaches the work roll, but also allows liquid droplet size to be controlled, so that finer cooling control is possible than in prior art systems.
  • the pressure of the gas supply which interacts with the cryogenic liquid By adjusting the pressure of the gas supply which interacts with the cryogenic liquid, the size of droplets formed during atomising may be varied. The smaller the droplets so formed, the less the cooling power at the work roll surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

L'invention concerne un procédé de commande d'un profil d'une surface d'un ou de plusieurs cylindres de travail (8) d'un laminoir comprenant la fourniture d'un liquide de refroidissement cryogénique (20) à une buse (23) selon un débit sensiblement constant; et la commande (58) d'une fourniture de gaz (57) pour la fourniture de gaz (24) au liquide de refroidissement cryogénique. Si le pouvoir réfrigérant fourni par le liquide de refroidissement à la surface du cylindre de travail (8) est supérieur au pouvoir de refroidissement requis, la fourniture de gaz du liquide de refroidissement est commandée de sorte que le liquide de refroidissement (20) soit atomisé (27) par le gaz avant d'être pulvérisé depuis la buse sur la surface du cylindre de travail. Si le pouvoir réfrigérant fourni par le liquide de refroidissement à la surface du cylindre de travail est inférieur au pouvoir de refroidissement requis, la fourniture de gaz est commandée de sorte que le liquide de refroidissement (20) soit fourni depuis la buse sous la forme d'un liquide (26) à la surface des cylindres de travail.
PCT/EP2014/051942 2013-03-05 2014-01-31 Dispositif et procédé de refroidissement WO2014135316A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP14703047.2A EP2964405A1 (fr) 2013-03-05 2014-01-31 Dispositif et procédé de refroidissement
BR112015020789A BR112015020789A2 (pt) 2013-03-05 2014-01-31 método para controlar perfil de superfície de um ou mais cilindros de trabalho de laminador e dispositivo de resfriamento para um ou mais cilindros de trabalho de laminador
CN201480012462.3A CN105121045A (zh) 2013-03-05 2014-01-31 冷却设备和方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1303863.3 2013-03-05
GB1303863.3A GB2511512B (en) 2013-03-05 2013-03-05 Cooling device & method

Publications (1)

Publication Number Publication Date
WO2014135316A1 true WO2014135316A1 (fr) 2014-09-12

Family

ID=48142397

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/051942 WO2014135316A1 (fr) 2013-03-05 2014-01-31 Dispositif et procédé de refroidissement

Country Status (5)

Country Link
EP (1) EP2964405A1 (fr)
CN (1) CN105121045A (fr)
BR (1) BR112015020789A2 (fr)
GB (1) GB2511512B (fr)
WO (1) WO2014135316A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017186433A1 (fr) * 2016-04-27 2017-11-02 Sms Group Gmbh Procédé et dispositif de refroidissment d'un outil

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104384204B (zh) * 2014-10-21 2016-05-11 北京科技大学 一种基于动态分段冷却技术的热轧铝板凸度控制方法
CN109702017A (zh) * 2018-12-11 2019-05-03 中南大学 一种深冷气体与低含量润滑油复合润滑降低轧辊磨损的装置与工艺
CN110743917A (zh) * 2019-11-25 2020-02-04 武汉北凯科技有限公司 轧机液氮冷却系统
KR102390012B1 (ko) * 2020-06-09 2022-04-28 제일산기 주식회사 고온 브리켓 철의 냉각장치

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2156255A (en) * 1984-03-23 1985-10-09 Davy Mckee Rolling mill
US20080048047A1 (en) * 2006-08-28 2008-02-28 Air Products And Chemicals, Inc. Cryogenic Nozzle
WO2009032700A1 (fr) * 2007-08-28 2009-03-12 Air Products And Chemicals, Inc. Procédé et appareil de décharge d'un spray cryogénique non linéaire sur la largeur d'une cage de laminoir
EP2489446A1 (fr) * 2011-02-17 2012-08-22 Linde Aktiengesellschaft En-tête de buse

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55117508A (en) * 1979-03-02 1980-09-09 Sumitomo Metal Ind Ltd Cooling method for rolling roll
JPH04279260A (ja) * 1991-03-06 1992-10-05 Sumitomo Metal Ind Ltd 連続鋳造におけるロール冷却ノズル
CN201008815Y (zh) * 2007-03-13 2008-01-23 威远县兴宇化工环保研究所 自吸式高效雾化喷嘴
BE1017806A3 (fr) * 2007-10-08 2009-07-07 Ct Rech Metallurgiques Asbl Installation et procede de lubrification par atomisation pour cylindres de laminage.
EP2465619A1 (fr) * 2010-12-16 2012-06-20 Siemens VAI Metals Technologies GmbH Procédé et dispositif d'application d'un lubrifiant lors du laminage d'un produit de laminage métallique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2156255A (en) * 1984-03-23 1985-10-09 Davy Mckee Rolling mill
US20080048047A1 (en) * 2006-08-28 2008-02-28 Air Products And Chemicals, Inc. Cryogenic Nozzle
WO2009032700A1 (fr) * 2007-08-28 2009-03-12 Air Products And Chemicals, Inc. Procédé et appareil de décharge d'un spray cryogénique non linéaire sur la largeur d'une cage de laminoir
EP2489446A1 (fr) * 2011-02-17 2012-08-22 Linde Aktiengesellschaft En-tête de buse

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017186433A1 (fr) * 2016-04-27 2017-11-02 Sms Group Gmbh Procédé et dispositif de refroidissment d'un outil

Also Published As

Publication number Publication date
GB2511512A (en) 2014-09-10
EP2964405A1 (fr) 2016-01-13
BR112015020789A2 (pt) 2017-07-18
GB2511512B (en) 2015-06-10
CN105121045A (zh) 2015-12-02
GB201303863D0 (en) 2013-04-17

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