EP2303480B1 - Method and device for lubricating rollers and a rolled strip of a rolling stand - Google Patents

Description

The invention relates to a method for lubricating rolls, in particular of work rolls of a roll stand and rolled rolled and conveyed between these rolled strip, wherein a lubricant-gas mixture, a lubricant-water-gas mixture, a lubricant-water mixture and / or a grease-medium mixture is applied to the rollers or the rolled strip on the upstream side.

The rolling stand comprises a plurality of mutually supporting rollers, such as a work roll, which comes directly into contact with the rolling stock and in turn rolls on a usually larger support roll or an intermediate roll. Roll-gap lubrication systems are integrated in many hot rolling mills for rolling a metal strip. These are used to improve the surface quality of the work roll and the strip and now belong to the usual equipment of a rolling mill on which high-quality tapes are to be produced. The system in which water as a carrier medium is mixed together with oil and applied to the rolled strip or the working or backup roll is widely used.

In the cold rolling process, lubrication is common. In this case, lubricant is applied to the rolled strip and / or the work roll and / or injected into the roll gap. The mixture of oil and water takes place far away from the mill stand. In most cases, an emulsion is used, which is prepared in a complex process in a circulation system, cleaned and fed back to the lubrication system.

From the WO 03 002277 A1 are a method and apparatus for cooling and / or lubricating rollers, in particular of the work rolls, a rolling stand known in which water in the form of sprays as a cooling medium and oil, an oil-air mixture, an oil-water mixture, a Oil-water-air mixture or fat mixtures can be used as a lubricant. To improve the lubricating and cooling effect, a combined use of supercooling of the belt and roll surface and the roller lubrication on the scaffold inlet side is proposed, in which the two media - water and lubricant - the rolls or the strip fed separately and to different application sites of the roll surface be applied. Separate feeds to the spray bars are provided for water and the lubricant respectively.

It is the object of the invention to provide a simplified method of lubricating rolling of a metal strip which is useful in both cold and hot rolling.

According to the invention, this object is achieved by a method having the features of claim 1. During cold rolling, the aim of the new lubrication method is to produce the lubricant shortly before use or application, similar to hot rolling, and thus to avoid expensive preparation in a closed circuit. In order to operate the process economically, it also has the goal to minimize the amount of lubricant used. The same goal also exists when using the lubricating method according to the invention during hot rolling. When reducing the amount of lubricant at the same time the lubricating effect should be optimized and the lubrication effect be adjustable.

For example, oil-water dispersions, oil-water emulsions, oil-free water-miscible lubricants, oil-air mixtures or oil-water-air mixtures are used as lubricants. The media can be sprayed in 2-, 3-, or 4-fluid nozzles.

To reduce the amount of lubricant, it is particularly advantageous to atomize the lubricant with air. In a preferred embodiment, oil and water are mixed with air just before spraying. This way, even the smallest amounts of oil can be applied to the roll surfaces or the rolled strip. When hot rolling, mixing oil and water has the advantage, unlike using pure oil, that there is no risk of fire.

The advantage of the new lubrication process in the cold rolling process is that the oil concentration in the lubricant can be changed very quickly and flexibly. This allows the lubricant to be optimally adjusted to different materials to be rolled, to different belt speeds, to changing approvals and to the respective rolling stand. Furthermore, different oils and lubricating media for different applications can be provided.

Since the amounts of lubricant are so small that just the roll and / or belt surface is wetted, can be dispensed with a costly preparation. Here, the amount of oil used per meter spray bar length in the millimeter range per minute moves. The spent lubricant, together with the water from the cooling equipment and possibly other oil leaks, is sent to the water treatment plant and the oil is separated there.

Advantageous developments of the invention will become apparent from the dependent claims.

According to the invention, provision is made for water and at least one lubricant to be conveyed via separate supply lines to a mixer and mixed therein to form a water-lubricant dispersion or emulsion, the water-lubricant dispersion or emulsion being conveyed by means of a gas, in particular atomized by means of air, in atomizer nozzles and applied to the at least one work roll and / or the rolled strip.

Preferably, 3-fluid or 4-fluid mixing or atomizing nozzles are used, in which the water, the at least one lubricant and the air are mixed. It is understood that for the purposes of the invention, instead of air, another gas or gas mixture can be used.

Preferably, the at least one lubricant is first mixed with the water in an inflow line to form a mixture, and then the mixture in the interior of the 3-material or 4-substance mixing nozzle is mixed with the gas. Alternatively, the water, the at least one lubricant and the gas in the interior of the 3-material or 4-component mixing nozzle are mixed.

Preferably, the lubricant-gas mixture, the lubricant-water-gas mixture, the lubricant-water mixture and / or the fat-medium mixture is distributed over the entire width of at least one of the work rolls and / or the rolled strip.

Likewise, it proves to be advantageous if the amount of water, the at least one lubricant, the gas, the lubricant-gas mixture, the lubricant-water-gas mixture, the lubricant-water mixture and / or the grease-media mixture is distributed by means of control valves over the width of at least one of the work rolls and / or the rolled strip.

In another embodiment of the method it is provided that the amount and / or pressure of the at least one lubricant, the water, the lubricant-water mixture, the lubricant-gas mixture and / or the grease-media mixture by means of the control valves and / or in flow meters, pressure regulators and / or in mixing blocks over the width of at least one of the work rolls and / or the rolled strip is controlled.

Likewise, it can be provided that the at least one lubricant, water and gas are mixed in a 3-material nozzle, wherein the amount of the lubricant is regulated in sections over the width of at least one of the work rolls and / or the rolled strip and that pressure and / or Volume of gas and water are regulated.

Alternatively, the mixing operation is realized by mixing the at least one lubricant and the gas in a mixing block and then adding water to 2-component mixing nozzles. In this case, the water can be mixed outside each of an inner nozzle tube of the 2-component mixing nozzles.

In a further advantageous embodiment of the method, the at least one lubricant is mixed with the gas, in particular in a mixing block, and sprayed by means of nozzles on at least one of the rollers and / or the rolled strip, while the side of the nozzle water is sprayed.

Preferably, the supply of the at least one lubricant is controlled in zones over the width by means of a flatness control.

The invention also relates to a device for lubricating at least one roll and / or a rolled strip rolled between the rolls in a roll stand.

According to the invention, the device is characterized in that the device comprises at least one mixing block and / or multicomponent mixing devices, in particular atomizing nozzles, for mixing water, gas, at least one lubricant, in particular an oil, to a lubricant-gas mixture, a lubricant water Gas mixture, a lubricant-water mixture, and the device comprises control devices, in particular control valves, for determining the amount of aufzusprühenden on the at least one roller and / or the rolled strip by means of spray devices mixture.

Advantageously, the control devices are arranged in zones over the width of the at least one roller or the rolled strip. This can also provide flow meter and pressure regulator.

The multi-component mixing devices are designed either as internal or external mixers. Preferably, they comprise a turbulence plate or venturi.

Advantageously, it can be provided that water spray bars are provided above and / or below spray devices for spraying a lubricant-containing mixture onto the at least one roller and / or the rolled plate. This has a fire protection effect in the case of hot rolling. Flammable oil or grease is shielded by a water spray curtain and can not heat up and cause a fire.

In addition, the device can be advantageously with a control device for controlling the flatness of the rolled strip under evaluation of signals a flatness measuring device, in particular a flatness measuring roll, equip.

The flatness measuring device preferably comprises a measuring roller which generates signals corresponding to the flatness of the rolled strip and forwards them to the spraying devices for adjusting the quantities or concentrations of the at least one lubricant. By using the flatness measuring device, the flatness of the rolled strip can also be considered in a higher order by evaluating the signals of the flatness measuring roller, and measures can be taken for correction, for example by changing the lubricant quantities or concentrations.

Preferably, the spray devices can be arranged in two rows substantially parallel to the axis of the roller, in particular offset from one another, in order to ensure sufficient lubrication of the roller surface or the rolled strip even in the event of failure of individual spray nozzles.

The invention also relates to a rolling stand in which a device described above for lubricating a roll and / or the rolled strip is used.

Fig. 1

eine Walzvorrichtung mit einem Öl-Wasser-Luft-Schmiersystem mit einem über der Breite variabler Schmiermittelversorgung, bei dem das Schmiermittel auf die obere Arbeitswalze gesprüht wird,

Fig. 2

eine Walzvorrichtung mit einem Öl-Wasser-Luft-Schmiersystem, bei dem das Schmiermittel in gleicher Menge über die Breite auf die obere Arbeitswalze aufgesprüht wird,

Fig. 3

eine Walzvorrichtung mit einem Öl-Wasser-Luft-Schmiersystem mit einem über der Breite variabler Schmiermittelversorgung, bei dem das Schmiermittel auf die Unterseite des Walzbandes gesprüht wird,

Fig. 4

eine Walzvorrichtung mit einem Öl-Wasser-Luft-Schmiersystem mit einer Mehrzahl von 3-Stoff-Mischdüsen mit Gas-Flüssigkeit-Zerstäubern, bei dem das Schmiermittel auf die obere Arbeitswalze gesprüht wird,

Fig. 5

eine Ausführungsform einer 3- oder 4-Stoff-Mischdüse zum Vermischen von Wasser, Schmiermittel und Gas, wie sie beispielsweise in der Walzvorrichtung gemäß Fig. 3 eingesetzt sind,

Fig. 6

eine zweireihige Anordnung von Mischdüsen zum Aufbringen von Schmiermittel auf eine Walze oder ein Walzband,

Fig. 7

eine Walzvorrichtung mit einem Öl-Wasser-Luft-Schmiersystem mit einer Mehrzahl von 3-Stoff-Mischdüsen mit Gas-Flüssigkeit-Zerstäubern und mit den 3-Stoff-Mischdüsen jeweils zugeordneten Regelventilen zum Regeln der Schmiermittelmenge, wobei dem das Schmiermittel auf die obere Arbeitswalze gesprüht wird,

Fig. 8

eine Walzvorrichtung mit einem Öl-Wasser-Luft-Schmiersystem, wobei Schmiermittel und Gas in einem Mischblock gemischt werden und Wasser in einer Mehrzahl von 2-Stoff-Mischdüsen zugesetzt wird und das Schmiermittel auf die obere Arbeitswalze gesprüht wird,

Fig. 9

den Mischblock gemäß Fig. 8 in Verbindung mit einer 2-Stoff-Mischdüse im Längsschnitt, wobei sich die Medien außerhalb der Mischdüse vermischen,

Fig. 10

eine 3-Stoff-Mischdüse zur Vermischung von Wasser, Schmiermittel und Gas mit einer Mischung der flüssigen Medien vor dem Eintritt in den Medienraum im Längsschnitt,

Fig. 11

eine weitere 3-Stoffdüse zur Vermischung von Wasser, Schmiermittel und Gas mit einer Mischung der flüssigen Medien vor dem Eintritt in den Medienraum im Längsschnitt, wobei sich sämtliche Medien in dem Medienraum vermischen,

Fig. 12

eine Walzvorrichtung mit einem Öl-Gas-Schmiersystem, wobei Schmiermittel und Gas in einem Mischblock gemischt werden, das Schmiermittel auf beide Arbeitswalzen gesprüht wird und gleichzeitig Wassersprühbalken als Brandschutzvorrichtungen vorgesehen sind, und

Fig. 13

die Walzvorrichtung gemäß Fig. 7, wobei zusätzlich eine Planheitsmessrolle und eine Planheitsregeleinrichtung vorhanden sind.

The invention will be explained in more detail in exemplary embodiments. Show it:

Fig. 1

a rolling device having an oil-water-air lubrication system with a width-variable lubricant supply, wherein the lubricant is sprayed onto the upper work roll;

Fig. 2

a rolling device with an oil-water-air lubrication system, in which the lubricant is sprayed in the same amount across the width of the upper work roll,

Fig. 3

a rolling device having an oil-water-air lubrication system with a width-variable lubricant supply, wherein the lubricant is sprayed onto the underside of the rolled strip,

Fig. 4

a rolling device having an oil-water-air lubrication system with a plurality of 3-fluid mixing nozzles with gas-liquid atomizers, in which the lubricant is sprayed onto the upper work roll,

Fig. 5

an embodiment of a 3- or 4-component mixing nozzle for mixing water, lubricant and gas, as used for example in the rolling apparatus according to Fig. 3 are used

Fig. 6

a double-row arrangement of mixing nozzles for applying lubricant to a roll or a rolled strip,

Fig. 7

a rolling device having an oil-water-air lubrication system with a plurality of 3-fluid mixing nozzles with gas-liquid atomizers and with the 3-fluid mixing nozzles respectively associated control valves for controlling the amount of lubricant, wherein the lubricant on the upper work roll is sprayed,

Fig. 8

a rolling apparatus having an oil-water-air lubrication system wherein lubricant and gas are mixed in a mixing block and water is added in a plurality of 2-component mixing nozzles and the lubricant is sprayed onto the upper work roll;

Fig. 9

according to the mixing block Fig. 8 in combination with a 2-material mixing nozzle in longitudinal section, with the media mixing outside the mixing nozzle,

Fig. 10

a 3-substance mixing nozzle for mixing water, lubricant and gas with a mixture of the liquid media before entering the media space in longitudinal section,

Fig. 11

a further 3-material nozzle for mixing water, lubricant and gas with a mixture of the liquid media before entering the media space in a longitudinal section, wherein all media mix in the media room,

Fig. 12

a rolling device with an oil-gas lubrication system, wherein lubricant and gas are mixed in a mixing block, the lubricant is sprayed on both work rolls and at the same time water spray bars are provided as fire protection devices, and

Fig. 13

the rolling device according to Fig. 7 , wherein additionally a flatness measuring roll and a flatness control device are present.

A rolling device 1 ( Fig. 1 ) comprises two work rolls 2, 3, which are supported between two support rolls 4, 5 and a rolled strip 6 (FIG. Fig. 3 ) roll. In this case, a lubricant, in particular a first and a second oil, or other oils and water are first supplied via separate supply lines 7, 8 and 9. First the two oils are mixed together. Alternatively, only one or the other oil is used. The desired amounts of water and the two oils are adjusted by means of metering pumps 10, 11 and pumped to a mixer 12. Behind the mixer 12, this results in a dispersion or emulsion of the merged liquids. The distance between the mixer 12 and downstream in the flow direction control valves 13 is preferably very small, or constitute a unit to avoid segregation. The control valves 13 are distributed over the entire width of the upper work roll 2. If longer piping is unavoidable, turbulence plates (mixers) are provided in the line at regular intervals. The pipe cross section is preferably chosen as small as possible in order to realize the highest possible flow velocity and thus a short transport time. In order to be able to adjust the amount of lubricant applied across the width of the work roll 2 and also dependent on the width of the processed rolled strip 6, the control valves 13 deliver lubricants downstream of the width of the rolled strip 6 to spray nozzles 14 arranged downstream of the flow direction and designed as 2-substance mixing nozzles. In the atomizer 14 is Added to the lubricant-water mixture air, which is supplied via a line 15 with a pressure regulator 16 for adjusting the air pressure. The adjustment of the amounts of lubricant or oil as well as of the quantities of water takes place either via a computer model and / or via a control device which takes into account the different lubricating properties as a function of the strip material to be rolled, the speed, the decrease, the temperatures and other parameters. The controls of the control valves 13 and the quantities pumped by the metering pumps 10, 11 are matched. The control device determines the lubricant concentrations or the types of lubricant and also performs a profile and flatness control of the rolled strip 6 by. Unevenness of the rolled strip 6 is then compensated by a suitable supply of the lubricant amounts or by changing other parameters. If necessary, the rolling force level can be influenced by changing the oil quantity, the type of oil, the oil concentration in the water or / and the oil mixing ratio.

In a simplified embodiment of the rolling device 1 ( Fig. 2 ) No control valves 13 are present. In this case, the flow rate of the atomizing nozzles 14 is set manually or results from the setting of the metering pump. In a further embodiment ( Fig. 3 ), the lubricant-water-air mixture is applied directly to the underside of the rolled strip 6. Also in this case, the control valves 13 are provided.

In a further embodiment ( Fig. 4 ) Water, the lubricant, such as oil, and air are first supplied via separate lines 7, 9, 15 and then applied via 3-nozzle nozzles designed as spray nozzles 14 and 17 on the upper work roll 2, wherein the mixing and atomizing the Fluids form a unit in the spray nozzles 17. In this case too, however, it is possible to provide control devices which individually supply the respective fluid to the individual atomizing nozzles 17 or to a group of atomizing nozzles regulate. Preferably, all the individual control devices are integrated into a control system which determines the volume and the mixing ratio of the fluids which are discharged from the atomizer nozzles 17 onto the work roll 2 or the rolled sheet 6. It is understood that in all versions ( Fig. 1 to 4 ) analogous embodiments for supplying a lubricant-water-air mixture to the lower work roll 3 or on the upper side of the rolled strip 6 are provided or can be provided.

An atomizing nozzle 17 ( Fig. 5 ) is designed as an internal mixer-pressure mixing nozzle with an inner space 18, fed in the one hand via a supply line 19 water and two lubricants and mixed as needed by means of eg turbulence sheets 36 or pipe constriction 37. The mixing process of the liquids takes place shortly before the atomization. Mixer and nozzle are here a unit. Via two lines 20, 21, the lubricant is first introduced into the supply line 19 immediately before its exit into the interior 18. A gas, in particular air, enters the interior 18 via another feed line 22 and is swirled there with the mixture of water and the two lubricants. Subsequently, the mixture leaves a conical nozzle opening 23 and impinges on the surface of a roll or rolled strip 6. Since the lubricant (for example, oil) or a plurality of lubricants is the most important component, it is within the meaning of the invention also possible to regulate only the amount of oil individually per spray nozzle 17 and the other components in groups, so for example over a larger portion of the width of a Roller and / or rolled strip 6, to regulate. The application of the lubricant or lubricants can be done without the use of water using only compressed air. In this case, a 2-fluid nozzle is used.

Especially when cold rolling, it is important that the lubricating film acts completely over the entire bandwidth of the rolled strip 6. If the oil film collapses, so create unwanted scratches on the surface. In order to ensure a redundancy of the lubricating effect, preferably two or more rows 24, 25 (FIG. Fig. 6 ) of atomizing nozzles 17 with respect to a roller, for example the work roll 2, or with respect to the rolled strip, in which the atomizing nozzles 17 are preferably offset from one another. Alternatively, a 1-row nozzle bar can be used, the nozzles have a large spray angle, so that a double overlap arises. That is, if a nozzle fails, the adjacent nozzles will cover that area.

Similar to the in Fig. 1 and 3 illustrated embodiments are in further embodiments of the invention control devices 26 ( Fig. 7 ), with which the inflow of the lubricant is controlled individually per atomizer nozzle 14 over the entire bandwidth. By modifying the amount of water and air, the overall effect of lubrication can be additionally influenced. During hot rolling, at least one of the work rolls 2, 3 is supplied with lubricant; During cold rolling, the rolled strip 6 is preferably supplied with the lubricant.

According to another variant ( Fig. 8 ), lubricant and air are brought together in a mixing block 27. The air carries the lubricant to the atomizing nozzles 14. Each of the nozzles 14 is fed individually. The water is introduced separately into the nozzles 14.

In the mixing block 27 ( Fig. 9 ) From the lines 7 and 15, first the lubricant and air are brought together. Then, the mixture is combined via a line 28 of a 2-material nozzle 29 with the water supplied from the line 8. The 2-material nozzle 29 is designed as an external mixer. This means that the lubricant-air mixture and the water meet only at a nozzle outlet 30. The mixing is made possible by spraying two hollow cones formed by the fluids. The advantage of this 2-material nozzle 29 is that saponification is excluded, since lubricant and water come into contact only at the nozzle outlet 30 with each other. The supply of water can be switched off to create a pure lubricant-air lubrication.

In a 2-fluid nozzle 31 ( Fig. 10 ), which is designed as an internal mixer with an interior 32, water and oil are first introduced together into the interior 32 via a feed line 33 and separately the air. In the oil-water supply line 33 turbulence plates 34 or a venturi are mounted to ensure a mixing of the media.

A 3-material nozzle 35 ( Fig. 11 ) also has an inner space 32, in the separately, the media oil, water and air via lines 7, 8 and 15 are supplied. The liquid media are thus mixed only in the interior 32, atomized and atomized by the air.

If you want to use an oil-air mixture without having to add this additional water, so the hot rolling is provided by a fire by the oil-air mixture outwardly shielding water curtain by means of water spray bar 38, 39 (if necessary) Fig. 12 ) is produced. In addition, shielding walls 40, 41 are provided around the oil-air mist generated by the atomizing nozzles 14. The oil-air mist can be sucked to the outside. The shielding walls 40, 41 as well as the nozzle bars 14 are made pivotable to improve the shielding and to place the nozzles close to the roll. A comparable suction is also provided for the lubricant application on the rolled strip (during cold rolling).

For influencing the superficial structure (flatness, uniform stress state) of the rolled strip 6 is in another embodiment of the invention a flatness measuring roller 42 ( Fig. 13 ) or another non-contact (optical) flatness measurement for determining unevenness of the rolled strip 6, which transmits signals via a signal line 43 to an (not shown here) evaluation device. In this signals for the regulation or control of the atomizing nozzles 14 and control valves 13 for dispensing adapted amounts of lubricant to the work roll 2 are generated over the bandwidth. The amount of lubricant delivered per zone or the lubricant concentration can influence the band flatness of parabolic or higher order. It is understood that a corresponding regulation with respect to the lower work roll 3 can also be applied. Likewise, the atomizing nozzles 14 may also spray the lubricant directly onto the rolled strip 6 to affect the band flatness and tape tension distribution over the belt width.

LIST OF REFERENCE NUMBERS

1 rolling device 2 Stripper 3 Stripper 4 supporting roll 5 supporting roll 6 rolled strip 7 supply 8th supply 9 supply 10 metering 11 metering 12 mixer 13 control valves 14 Atomizing nozzles (multi-substance nozzles) 15 management 16 pressure regulator 17 Atomizing nozzles (multi-substance nozzles) 18 inner space 19 supply 20 management 21 management 22 supply 23 nozzle orifice 24 line 25 line 26 control equipment 27 mixing block 28 management 29 More-component nozzle 30 nozzle exit 31 More-component nozzle 32 inner space 33 supply 34 turbulence plate 35 More-component nozzle 36 turbulence plate 37 pipe constriction 38 spray 39 spray 40 wall 41 wall 42 Flatness roll 43 signal line

Claims (18)

1. Method of lubricating rolls, particularly working rolls (2, 3), of a roll stand and a strip (6) to be rolled which is rolled and conveyed through between these, in which a lubricant/gas mixture, a lubricant/water/gas mixture, a lubricant/water mixture and/or a grease/medium mixture is or are applied to the rolls (2, 3) or the strip (6) to be rolled, characterised in that the mixture is provided by means of at least one mixing device (14, 17, 27, 29, 31, 35) in the region in front of the roll stand, that water and at least one lubricant are conveyed by way of separate feed lines (7, 8, 9) to a mixer (12) and are mixed in this to form a water/lubricant dispersion or emulsion and that the water/lubricant dispersion or emulsion is atomised by means of a gas, particularly by means of air, in atomiser nozzles (14, 17) and applied to the at least one working roll (2, 3) and/or the strip (6) to be rolled.
2. Method according to claim 1, characterised in that the water, the at least one lubricant and a gas, particularly air, are mixed in multi-media mixing or atomiser nozzles (14, 17, 27, 31) and that preferably the mixer for the different liquids and the nozzle (17, 31) in practical terms form a unit or that preferably the at least one lubricant is initially mixed with the water in an inflow line to form a mixture and that the mixture is subsequently mixed in the interior space of the multi-mixing nozzle (35) with the gas or that preferably the water, the at least one lubricant and the gas are mixed in the interior space (32) of the 3-medium or 4-medium mixing nozzle.
3. Method according to one of claims 1 and 2, characterised in that the lubricant/gas mixture, the lubricant/water/gas mixture, the lubricant/water mixture and/or the grease/medium mixture is or are distributed over the entire width of at least one of the working rolls (2, 3) and/or the strip (6) to be rolled.
4. Method according to any one of claims 1 to 3, characterised in that the quantity of water, the at least one lubricant, the gas, the lubricant/gas mixture, the lubricant/water/gas mixture, the lubricant/water mixture and/or the grease/medium mixture is or are distributed by means of regulating valves (13) over the width of at least one of the working rolls (2, 3) and/or the strip (6) to be rolled and that preferably the quantity and/or the pressure of the at least one lubricant, the water, the lubricant/water mixture, the lubricant/gas mixture and/or the grease/medium mixture is or are regulated by means of the regulating valves (13) and/or in throughflow meters, pressure regulators (16) and/or mixing blocks (27) over the width of at least one of the working rolls (2, 3) and/or the strip (6) to be rolled.
5. Method according to any one of claims 1 to 4, characterised in that the at least one lubricant, water and gas are mixed in a 3-medium nozzle (35), wherein the quantity of the lubricant is regulated section-by-section over the width of at least one of the working rolls (2, 3) and/or of the strip (6) to be rolled and that the pressure and/or volume of the gas and the water is or are regulated.
6. Method according to any one of claims 1 to 5, characterised in that the at least one lubricant and the gas are mixed in a mixing block (27) and that subsequently water is added in 2-medium mixing nozzles (29) and that preferably the water is admixed in each instance outside an inner nozzle tube of the 2-medium mixing nozzles (29).
7. Method according to any one of claims 1 to 6, characterised in that the at least one lubricant is mixed with the gas, particularly in a mixing block (27), and sprayed by means of nozzles (14, 17) onto at least one of the rolls (2, 3) and/or the strip (6) to be rolled, whereas water is sprayed on laterally of the nozzles.
8. Method according to any one of the preceding claims, characterised in that the gas serves as transport means for the lubricant from the mixing block (27) through the line (28) to the nozzle (29) and only there is mixed and atomised inside or outside the nozzle (29, 14) and is sprayed by means of nozzles (14, 17, 29) onto at least one of the rolls (2, 3) and/or the strip (6) to be rolled.
9. Method according to any one of claims 1 to 8, characterised in that the feed of the at least one lubricant is regulated zonally over the width by means of a planarity regulating means (42, 43) and that preferably through changing the lubricant quantity, lubricant kind, lubricant concentration in water and/or lubricant kind and mixing ratio the level of rolling force is changed in a short time or it is possible to flexibly adapt to changed rolling conditions (speed, reduction, etc.).
10. Device for lubricating at least one roll (2, 3) and/or a rolling strip (6), which is rolled between the rolls (2, 3), in a roll stand, characterised in that the device comprises at least one mixing block (27) and/or multi-media mixing devices, particularly atomiser nozzles (14, 17, 29, 31, 35), for mixing water, gas, at least one lubricant, particularly an oil, to form a lubricant/gas mixture, a lubricant/water/gas mixture, a lubricant/water mixture and that the device comprises regulating devices, particularly regulating valves, for determining the quantity of the mixture to be sprayed by means of spray devices (14, 17) onto the at least one roll (2, 3) and/or the strip (6) to be rolled.
11. Device according to claim 10, characterised in that the regulating devices are arranged zonally over the width of the at least one roll (2, 3) or of the strip (6) to be rolled.
12. Device according to claim 10 or 11, characterised in that it comprises throughflow meters and pressure regulators (16).
13. Device according to any one of claims 10 to 12, characterised in that the multi-media mixing devices (29, 31, 35) are constructed as internal or external mixers and that preferably the multi-media mixing devices comprise a turbulence plate (34, 36) or a venturi nozzle or tube narrowing (37).
14. Device according to any one of claims 10 to 13, characterised in that the water spray bars (38, 39) are provided above and/or below spray devices for spraying a mixture, which contains lubricant, onto the at least one roll and/or the roll plate.
15. Device according to any one of claims 10 to 14, characterised in that walls for lateral screening of a lubricant air mist generated by the spray devices (14) are present and that preferably a suction means for the medium mist is present and that with particular preference the screen is pivotable up to the rolls (2, 3) or the strip (6).
16. Device according to any one of claims 10 to 15, characterised in that it comprises a regulating device for regulating the planarity of the strip (6), which is to be rolled, through evaluation of signals of a planarity measuring device and that preferably the planarity measuring device comprises a measuring roller (42) or contactless measuring device, which generates signals corresponding with the planarity of the strip to be rolled and passes them on to the spray devices (14) for setting the quantities or concentrations of the at least one lubricant.
17. Device according to any one of claims 10 to 16, characterised in that the spray devices (14, 17) are arranged, particularly offset relative to one another, substantially parallel to the axis of a working roll (2, 3) or that the spray devices (14, 17) are executed in a single row and the nozzles thereof have a large spray angle so that doubled overlapping of the adjacent jets is given.
18. Roll stand with a device according to any one of claims 10 to 17, characterised in that the nozzle bars are constructed to be pivotable so that the spacing between nozzle outlet and roll or strip can be set to be minimal or optimal.

Images