EP2195125B2 - Installation et procede de lubrification par atomisation pour cylindres de laminage - Google Patents

Installation et procede de lubrification par atomisation pour cylindres de laminage Download PDF

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Publication number
EP2195125B2
EP2195125B2 EP08837441.8A EP08837441A EP2195125B2 EP 2195125 B2 EP2195125 B2 EP 2195125B2 EP 08837441 A EP08837441 A EP 08837441A EP 2195125 B2 EP2195125 B2 EP 2195125B2
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EP
European Patent Office
Prior art keywords
oil
rolling
line according
lubrication
bar
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.)
Not-in-force
Application number
EP08837441.8A
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German (de)
English (en)
French (fr)
Other versions
EP2195125B1 (fr
EP2195125A1 (fr
Inventor
Bart Vervaet
Hugo Uijtdebroeks
Griet Lannoo
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 Asbl - Centrum
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Centre de Recherches Metallurgiques CRM ASBL
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Application filed by Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Publication of EP2195125A1 publication Critical patent/EP2195125A1/fr
Publication of EP2195125B1 publication Critical patent/EP2195125B1/fr
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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

Definitions

  • the present invention relates to a rolling line comprising a new lubrication system for the rolls or rolls of a hot or cold rolling line.
  • the invention also relates to the method implemented on the installation.
  • the document EP 1 512 469 A1 relates to an in-line lubrication plant for rolling rolls, preferably hot rolled, of a metal strip, preferably steel, by spraying or atomizing a lubricant (11) on a target comprising said rolls and / or said strip, preferably in the vicinity of the right-of-way, by means of one or more controllable air atomizers (10), each atomizer (10) comprising an inlet for the air (12) or the inert gas under pressure and a inlet for the oil (11) in an adapter followed by a mixing chamber (132 ') and an outlet nozzle for the atomized mixture.
  • an emulsion which is a suspension of oil droplets in water, with an oil concentration typically varying between 0.3 and 2%. It can be either a stable emulsion or an unstable emulsion prepared online.
  • the emulsion is applied directly to the work rolls by means of a spray device located after the squeegees in order to apply the oil to a dry surface.
  • a spray device located after the squeegees in order to apply the oil to a dry surface.
  • the interest of a good lubrication of the working rollers is not only limited to the problem of roller performance (surface degradation) but is also related to the forces and rolling torques to be applied and consequently to the required power consumption.
  • the need for efficient lubrication is further enhanced with the use of HSS type rollers characterized by a higher coefficient of friction than traditional rolls, with steeper steels and lower thickness, under increased production and in conditions of surface quality imposed by the more severe customers.
  • the coefficient of friction depends on many factors such as the application technology used, the amount of oil, the nature of the oil, the flow rate and the concentration of the oil emulsion , the surface temperature of the strip or rolls, the nature and condition of the rollers (roughness, degradation, scale, water film thickness, etc.), the rolling force and speed, the reduction, the grade and the surface condition of the product, etc.
  • the lubrication efficiency can be very different from one rolling train to another and from one cage to another in the same train.
  • the lubrication efficiency is a function of the lubricant supply technology, the nature of the lubricant (mineral, ester-based, etc.) and the amount thereof. . Satisfactory results are obtained by spraying oil in surface distributions ("plate-out") of 0.1 to 1 g / m 2 .
  • the device for spraying the oil emulsion is either a venturi, the suction of the oil being carried out by the depression created by moving water in the main tube, or a conventional flat sprinkler device for injecting a stable emulsion, for example a static mixer ("static tube mixer") where an oil injection is carried out in a tube zone where the shear (speed gradient) is increased by means of the presence of "obstacles".
  • static mixer static mixer
  • injectors whose number is selected according to the bandwidth to be lubricated (3 to 7 injectors for a band up to 2 meters wide).
  • the document EP-A-1,193,004 discloses a cold rolling lubrication process comprising the steps of: providing a rolling oil emulsion using a first oil supply device in the form of an emulsion supplied to a cylinder and a steel strip in a closed circuit mode and a second device for supplying the emulsion only on the front and rear surfaces of the steel strip.
  • the rolling oil is added to an emulsifier of the same type and concentration as those used for the first device, with an average particle size control so that they are larger than in the first device .
  • the emulsion produced by the second device not adhered to the band is recovered at the same time as the emulsion produced by the first device.
  • the document WO-A-03 / 002,277 discloses an installation for cooling and lubricating working rolls in a rolling stand, separately comprising a cooling water spray bar and a lubricating oil spray bar, an oil / air mixture, oil / water or oil / air / water, or fat.
  • WO-A-03/000 437 discloses an installation and a method of lubricating rolling rolls, wherein an oil-in-water emulsion in adjustable proportions is homogeneously prepared in a mixer and supplied to different spray areas whose distribution is variable in width. Each zone corresponds to a row of nozzles, each nozzle being controlled by at least one relay valve.
  • JP-A-2001 / 179,313 discloses a lubricant application device, either in the form of undiluted oil or emulsion, having a network structure for uniform adhesion of the lubricant to a working roller in a rolling mill stand.
  • the patent US-A-3,933,660 proposes a lubricating reducing oil for hot rolling of copper and its alloys comprising 1000 parts by weight of water, 6 to 200 parts by weight of anionic surface activator of carboxylic acid, sulfate or phosphate type and 0.8 to 200 parts by weight of at least one compound containing a hydroxyl group of alcohol type, alkylene glycol or ether glycol.
  • Rolling oil provides copper and its alloys with lubrication, the ability to remove an oxide film and the ability to prevent the formation of oxide film by spraying between the rolling roll and the hot rolling strip.
  • JP-A-2003 / 129,079 discloses a lubricating composition for the plastic working of a metal comprising a carboxylate, a metal acid phosphate or a metal alkylphosphonate.
  • the document JP-A-55 151 093 discloses a lubricating process in cold rolling a strip coated with a polar organic compound wherein an oil emulsion and a composition comprising a polar organic compound such as stearic acid are sprayed.
  • the excess oil emulsion is removed by wringing after formation of an oil layer adsorbed on the surface of the strip.
  • WO-A-2005/071 050 discloses a self-emulsifying lubricant for metal working obtained by maleation of vegetable or animal triglyceride oil.
  • the present invention aims to provide a solution that overcomes the disadvantages of the state of the art and in particular those related to the use of oil / water emulsions.
  • the invention aims to obtain a high homogeneity of cylinder lubrication, adaptable and controllable both upward and downward.
  • the invention also aims a precise and economical use of lubricant, very low flow, for the same efficiency.
  • the invention also aims to achieve an installation that does not require an electricity supply at the cage, or the heating of the oil.
  • Another object of the invention is easy maintenance, in particular by preventing the obstruction of the pipes and the nozzles.
  • the invention also aims to eliminate the risk of fire and the reduction of pollution by the lubricant.
  • the invention has the additional object of providing sprinklers directly mounted on a common air collector, in the form of a compact system, which feeds them and also serves as mechanical support.
  • Another object of the invention is to provide an installation comprising either a common pump with several nozzles per zone, or several dosing pumps for several nozzles, with a single pump per nozzle.
  • the object of the invention is the use of an oil without pressure in the nozzle, which is of adjustable flow rate.
  • a first object of the present invention relates to a rolling line of a metal strip comprising an in-line lubrication system for rolling rolls, preferably hot, preferably steel, by spraying or atomizing a lubricant on a target comprising said cylinders and / or said band, preferably in the vicinity of the right-of-way, by means of a ramp of controllable air atomizers, arranged parallel to said cylinders and supplied with air or inert gas under pressure, characterized in that each atomizer comprises an inlet for air or inert gas under pressure and a pure oil inlet without pressure in an adapter followed by a mixing chamber, and an outlet nozzle for the atomized mixture.
  • Another object of the present invention relates to a method of in-line lubrication of rolling rolls, preferably hot rolling, of a metal strip, preferably steel, by spraying or atomizing a lubricant by means of the aforementioned installation, characterized in that a cloud of fine droplets of pure oil under air pressure is generated at the outlet of the atomizers of the ramp, with a maximum oil flow of 200 ml. / min, the oil entering without pressure in the atomizer, the air pressure being less than 0.5 bar.
  • the figure 1 is a perspective representation (with its detail view) of an air atomizer ramp for spraying pure oil on rolling rolls, according to the present invention.
  • the figure 2 schematically represents a detail view in section of an atomizer of the ramp of the figure 1 .
  • the figure 3 schematically represents a general view of the lubrication system according to a first preferred embodiment of the invention.
  • the figure 4 represents a real example of atomization pattern obtained with the installation according to the present invention.
  • the figure 5 schematically represents a general view of the lubrication system according to a second preferred embodiment of the invention.
  • the figure 6 schematically represents a modular distribution valve (MDV) as used in the installation of the figure 5 .
  • MDV modular distribution valve
  • the figure 7 graphically represents the evolution of the total rolling force over time in a static pipe installation, respectively using rolling oil and rapeseed oil as lubricant and for different "flat-out" values.
  • the figure 8 graphically represents the evolution of the total rolling force over time in an installation according to the figure 5 , with use of rapeseed oil.
  • the present invention is based on the principle of air atomization to spray very small amounts of pure oil on the working cylinders. Due to the very low concentration of pure oil used, a flat-out distribution of 0 to 0.6 g / m 2 can be achieved.
  • the spray is formed by the intimate mixture of oil and air from two separate pipes, the air and the oil being "mixed" just after the exit of the small oil inlet tube. To obtain a perfect spray pattern, the air pressure and the oil flow rate were perfectly adjusted to the type of application considered, so as to avoid the formation of fog.
  • the oil is not under pressure, that is to say that it has a pressure as low as possible, but is supplied to the nozzles in a very small amount by a (micro) pump, in combination or not with a distributor.
  • the oil flows through a small tube and the risk of obstruction of the nozzle is non-existent because its orifice has an opening whose size is of the order of a millimeter. No oil heating is required because the spray pattern and the size of the droplets are controlled only by the pressure of the air.
  • the lubricating device comprises a ramp 2 of air atomizers 3 arranged parallel to the rolling cylinder 1.
  • the atomizers 3 are arranged along this ramp 2, perpendicular thereto, preferably equidistant from each other .
  • the distance between the ramp and the roll is 100-200 mm.
  • the figure 2 shows the detail of an atomizer 3, made of stainless steel.
  • This comprises a pressurized air inlet 4, an unpressurized oil inlet 5, these two inlets being located at a specially designed adapter 6 followed by a mixing chamber 6 'where oil and air, and a nozzle 7 for the output of the atomized mixture.
  • the adapter 6 located after the air collector 4 thus allows the air transport and the oil supply through the inlet 5. It also plays a role of attachment of the nozzle (support).
  • a dozen atomizers 3 for a ramp 2 allowing a treatment width of 2 m, with for example a minimum oil flow rate of 50 ml / minute and a maximum of 150 ml / minute.
  • the preferred values of oil flow will be determined for each specific rolling mill as a function of the rotational speed of the rolls (up to 20 m / s). It is preferable to use natural oil (and therefore no "carrier” medium) at a pressure as low as possible (ideally 0 bar), with a viscosity in the range of 20-50 mPa.s.
  • the system will be adjusted to obtain a "platform-out" of the order of 0.4 g / m 2 , which optimizes the force and the rolling torque. Pressure air can not exceed 0.4-0.45 bar, otherwise the formation of fog.
  • the orifice of the nozzles must not be very small, it is typically 1.5 mm ⁇ , hence the risk of obstruction is low, as already mentioned.
  • the figure 3 shows a general view of a lubrication installation according to this first embodiment of the invention, comprising a ramp of controllable atomizers, as described on the figure 2 .
  • Each of the atomizers 3 of the ramp 2 is controlled at a distributor 9 having as many metering micropumps as atomizers on the ramp.
  • Each micropump of the distributor 9 is fed by an oil tank 11 and controlled individually, via an oil flow controller (12), by a PC 10 (eg 15 outputs, 0-40 Hz).
  • the ramp 2 is supplied by a pressurized air line 13.
  • the air pressure value is communicated to the PC for regulation by a pressure gauge 14.
  • the speed of the cylinder 1 is also communicated to the PC by a measuring device 15.
  • additional On / Off valve (not shown) can be installed on the oil line supplying the distributor 9, just before it, for reasons of ease of use of the installation.
  • the example of atomization drawing shown on the figure 4 has an extension of 18 cm, at a distance of 20 cm from the jets.
  • the extension is 13.5 cm if the nozzles are 15 cm (oil flow 6 ml / min and air pressure 0.3 bar with an air flow of 10 l / min per nozzle) .
  • the ramp 2 of air atomizers is supplied with oil from the tank 11 in parallel lines provided with metering pumps 16 and each terminating, through an inlet 17, to a distribution valve modular 8 (MDV, for modular divider valve , see figure 6 ) at one end of the ramp 2 and whose multiple outputs 18 feed the atomizers 3 located on the ramp 2.
  • MDV distribution valve modular 8
  • An additional On / Off valve can be installed on the parallel lines of oil supplying the distributor 8 , just before this one, for reasons of ease of use of the installation.
  • FIG. figure 6 An example of an MDV 8 distributor, with six outlets 11, marketed by Lubriquip Inc., Cleveland, Ohio (USA), is shown on FIG. figure 6 .
  • a sequential feeding cycle of the different exit doors 18 is ensured by the movement of the pistons 19.
  • the use of several valves makes it possible to divide the cylinder to be lubricated in 2 or 3 zones, for example A, B, C.
  • the supply air 13 is provided at one end of the ramp 2 (0.3 bar).
  • a dosing pump and an MDV distributor are used to feed each atomizer 3 of the zone.
  • the oil coming from the central tank 11 is conveyed to a metering pump 16.
  • the minimum pressure depends on the pressure drop of the valve MDV. Generally a pressure of 2 bar is necessary, but, if necessary, the pressure can be increased to 10-15 bar.
  • the oil will be filtered, to the extent that impurities arriving in the MDV valves are likely to disrupt the operation.
  • Comparative roller lubrication comparative tests using two different types of lubricants were carried out.
  • the two technologies used are respectively emulsified using the principle of the static tube, according to the state of the art and that using the pure oil according to the present invention.
  • the static tube has 4 jets located at a distance of 20-25 cm from the rollers to be lubricated.
  • the speed of the rollers is between 0.3 and 0.5 m / s and the reduction rate is 50%. Spraying on the rollers creates a watering area that is 15 cm wide.
  • a theoretical "flat-out" of 0.6 g / m 2 corresponds to a flow rate of 5 ml / min (ie 1.25 ml / min per nozzle) at a speed of 0.3 m / s and at a flow rate of 8 ml / min at a speed of 0.5 m / s.
  • a theoretical "flat-out" of 4.2 g / m 2 corresponds to a flow rate of 32 ml / min (ie 8 ml / min per nozzle) at a speed of 0.3 m / s.
  • a theoretical "flat-out" of 2.5 g / m 2 corresponds to a flow rate of 32 ml / min (ie 8 ml / min per nozzle) at a speed of 0.5 m / s.
  • the figure 7 shows the variation of the rolling force 21 as a function of time (and the moving average over 250 periods, 22), for each type of oil and, as the case may be, at different "plate-out" values (of 0, 6 to 4.2 g / m 2 ).
  • the speed of the rollers 23 is also shown.
  • the oil distributor was used with a dosing pump and 8 outlets (8 sprinklers).
  • the total flow to the distributor was 60 ml / min (7.5 ml / nozzle), which corresponds to a theoretical "out-of-the-box" of 0.4 g / m 2 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Metal Rolling (AREA)
EP08837441.8A 2007-10-08 2008-10-07 Installation et procede de lubrification par atomisation pour cylindres de laminage Not-in-force EP2195125B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2007/0486A BE1017806A3 (fr) 2007-10-08 2007-10-08 Installation et procede de lubrification par atomisation pour cylindres de laminage.
PCT/BE2008/000077 WO2009046505A1 (fr) 2007-10-08 2008-10-07 Installation et procede de lubrification par atomisation pour cylindres de laminage

Publications (3)

Publication Number Publication Date
EP2195125A1 EP2195125A1 (fr) 2010-06-16
EP2195125B1 EP2195125B1 (fr) 2014-12-03
EP2195125B2 true EP2195125B2 (fr) 2018-10-31

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EP08837441.8A Not-in-force EP2195125B2 (fr) 2007-10-08 2008-10-07 Installation et procede de lubrification par atomisation pour cylindres de laminage

Country Status (8)

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US (1) US8544608B2 (pt)
EP (1) EP2195125B2 (pt)
JP (1) JP5442619B2 (pt)
KR (1) KR101490354B1 (pt)
CN (1) CN101821026A (pt)
BE (1) BE1017806A3 (pt)
BR (1) BRPI0816606B1 (pt)
WO (1) WO2009046505A1 (pt)

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Also Published As

Publication number Publication date
US20100258380A1 (en) 2010-10-14
BRPI0816606A2 (pt) 2018-07-10
EP2195125B1 (fr) 2014-12-03
BE1017806A3 (fr) 2009-07-07
JP2010540255A (ja) 2010-12-24
EP2195125A1 (fr) 2010-06-16
KR101490354B1 (ko) 2015-02-05
JP5442619B2 (ja) 2014-03-12
WO2009046505A1 (fr) 2009-04-16
BRPI0816606B1 (pt) 2019-08-27
CN101821026A (zh) 2010-09-01
US8544608B2 (en) 2013-10-01
KR20100072203A (ko) 2010-06-30

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