EP3092088A1

EP3092088A1 - Lubrication using spray nozzles having multiple oil inlet openings

Info

Publication number: EP3092088A1
Application number: EP14806199.7A
Authority: EP
Inventors: Martin Boehm; Thomas BRAIDT; Gernot Dirisamer; Konrad Krimpelstaetter; Daniel Vipavc
Original assignee: Primetals Technologies Austria GmbH
Current assignee: Primetals Technologies Austria GmbH
Priority date: 2014-01-08
Filing date: 2014-11-18
Publication date: 2016-11-16
Anticipated expiration: 2034-11-18
Also published as: US10780475B2; TR201808864T4; RU2016132146A; EP3092088B1; RU2675413C2; CN106029245A; JP6321185B2; RU2016132146A3; WO2015104082A1; EP2893986A1; JP2017501889A; CN106029245B; US20160325327A1

Abstract

During the rolling of a metallic flat rolling stock (1) in a roll stand (2), lubricating oil (5) is sprayed onto the rolling stock (1) and/or at least one roll (3, 4) of the roll stand (2) by means of multiple spray nozzles (7) arranged beside one another. In each case, a mixing chamber (8) of a spray nozzle (7) is fed with a respective quantity of lubricating oil (5) via respective multiple oil inlet openings (9). The respective mixing chamber (8) is fed with compressed air (11) via respectively one air inlet opening (10). By means of the compressed air (11), the lubricating oil (5) is atomized in the respective mixing chamber (8) to form an aerosol and, via respectively at least one nozzle outlet (12), is sprayed onto the rolling stock (1) and/or the at least one roll (3, 4) of the roll stand (2).

Description

Description / Description

The present invention relates to a method for applying a lubricating oil to metallic flat rolled stock and / or at least one roll of a roll stand during rolling of the rolled stock in the roll stand by means of a plurality of juxtaposed spray nozzles,

wherein in each case a mixing chamber of a spray nozzle via a respective oil inlet opening a respective amount of lubricating oil is supplied,

wherein the respective mixing chamber is supplied with compressed air via in each case at least one air inlet opening,

- Wherein the lubricating oil is atomized by means of the compressed air in the respective mixing chamber to form an aerosol and sprayed on in each case at least one nozzle outlet of the respective spray nozzle on the rolling stock and / or the at least one roller of the rolling stand.

The present invention further relates to a device for applying a lubricating oil to flat metallic rolling stock and / or at least one roll of a rolling mill stand during rolling of the rolling stock in the rolling stand,

- wherein the device comprises a spray bar which extends parallel to a rotation axis of the at least one roller of the roll stand and on which a plurality of spray nozzles are arranged side by side,

- Wherein the spray nozzles each have a mixing chamber, which in each case via an oil inlet opening a respective amount

Lubricating oil is supplied,

- Wherein the respective mixing chamber in each case at least one

Air inlet has, via which the respective mixing chamber compressed air is supplied,

- Wherein the spray nozzles each have at least one nozzle outlet through which the atomized in the respective mixing chamber to an aerosol lubricating oil is sprayed onto the rolling stock and / or the at least one roller of the rolling stand. Such a method and apparatus are known. For example, reference is made to US 2010/0258380 AI or EP 2 465 619 AI.

The lubrication of the roll gap is of great importance in cold rolling for the stability and quality of the rolling. Usually, for lubrication of the roll gap a

Oil-water emulsion used. Recently, however, it has also become known, instead of an oil-water emulsion pure lubricating oil - for example in the form of base oil - aufzuspritzen on the rolling stock and / or the at least one roller.

When spraying, it is necessary to apply the lubricating oil evenly over the entire applied width. Over the length of the rolling stock, however, the amount of lubricating oil can vary. Depending on the rolling conditions such as width of the rolling stock, rolling speed, stitch loss, rolling force, etc., the amount of lubricating oil applied to the rolling stock and / or the at least one roll in a given roll stand can be between 35 ml / minute and 2000 ml / Minute vary. Relative to a single spray nozzle, the amount of lubricating oil can vary between 2 ml / minute and 60 ml / minute. So it is, based on a single spray nozzle, required, the amount of lubricating oil

reliably applied to the rolling stock and / or the at least one roll over a wide setting range (minimum to maximum ratio of about 1:30). Another problem is that the oil inlet openings can become clogged. If such a blockage occurs, part of the rolling stock and / or the roll gap will be insufficiently lubricated. This has a significant negative impact on the rolling process.

The object of the present invention is to provide ways by which ensures the required adjustment range in a simple and reliable manner can be largely avoided and beyond blockages or at least their effects can be limited. The object is achieved by a method having the features of claim 1. Advantageous embodiments of the method are the subject of the dependent claims 2 to 14.

According to the invention, a method of the type mentioned in the introduction is configured such that in each case a mixing chamber of a spray nozzle is supplied with the respective amount of lubricating oil not only via a respective single oil inlet opening but via a plurality of oil inlet openings in each case. This makes it possible, for example, to supply the oil inlet openings independently of one another with a respective subset of lubricating oil. Thus, for example, in the case of a relatively small amount of lubricating oil, this amount can be supplied via only one or two of the oil inlet openings, while in the case of a relatively large amount of lubricating oil, this amount can be supplied over all or almost all oil inlet openings. Furthermore, blockages usually occur independently of each other. Even if a blockage of one of the oil inlet openings should occur, the spray nozzle in this case can continue to be supplied via the remaining oil inlet openings, the lubricating oil. In individual cases, it may indeed be possible that in the case of blockage of one of the oil inlet openings only a reduced adjustment range can be realized. However, a complete failure of the oil supply can be almost certainly avoided.

Preferably, the spray nozzles are cylindrical, so that they have a respective longitudinal axis. In this case, preferably, the nozzle outlets at one of the axial ends of the respective spray nozzle and the respective at least one air inlet opening at the other axial end of the respective

Spray nozzle arranged. This results in a structurally simple construction of the spray nozzles and a simple and stable Guide the compressed air in the spray nozzle, especially in the mixing chamber.

Relative to one of the spray nozzles, one of the oil inlet openings in the direction of the longitudinal axis is arranged at a defined axial position. Preferably, at least one further of the oil inlet openings in the direction of the longitudinal axis is arranged at the same axial position. As a result, the axial position for the oil inlet openings can be uniformly determined optimally.

Preferably, the oil inlet openings arranged at the defined axial position are arranged distributed uniformly around the longitudinal axis. As a result, a particularly good atomization of the lubricating oil can be achieved.

Preferably, the lubricating oil of the respective mixing chamber is fed flow controlled. This can affect the amount

Lubricating oil can be dosed particularly well.

In practice, it has proved to be advantageous if the compressed air supplied to the respective mixing chamber has a pressure which is between 0.1 bar and 10 bar. The pressure can be in particular between 1.0 bar and 6.0 bar.

Preferably, a pressure with which the compressed air is supplied to the respective mixing chamber, adjusted in dependence on the amount of lubricating oil supplied to the respective mixing chamber. As a result, the formation of the aerosol can be optimized. In particular, the pressure with which the compressed air is supplied to the respective mixing chamber can increase with the quantity of lubricating oil supplied to the respective mixing chamber.

In practice, it has furthermore proved to be advantageous if the at least one air inlet opening has a diameter which lies between 0.01 mm and 5 mm. Preferably, the diameter may be between 3 mm and 5 mm, in particular at least 4 mm. In practice, it has also proved to be advantageous if the oil inlet openings have a diameter which is between 0.1 mm and 1.0 mm. The diameter can be between 0.4 mm and 0.6 mm in particular.

Preferably, the nozzle outlets are each slit-shaped. As a result, in particular a relatively wide fan beam can be generated.

In practice, it has also proven to be advantageous if the nozzle exits of the rolling stock and / or the work roll, on which the lubricating oil is injected, have a distance which is between 100 mm and 400 mm. The distance may be between 150 mm and 300 mm in particular.

In practice, it has also proved to be advantageous if the spray nozzles from each other have a distance which is between 50 mm and 300 mm. The distance may in particular be between 100 mm and 200 mm.

The lubricating oil sprayed onto the rolling stock and / or the at least one roller by one of the spray nozzles is sprayed onto a respective portion of the rolling stock and / or the at least one roller. Preferably, the sub-regions assigned to the directly adjacent spray nozzles have a degree of coverage which lies between 0% and 50%. At a coverage of 0%, the subareas only adjoin one another without overlapping. With a degree of coverage of 50%, the center of one subarea lies at the edge of the other subarea and vice versa.

The object is further achieved by a device having the features of claim 15. Advantageous embodiments of the device are the subject of the dependent claims 16 to 24. According to the invention, the device is provided analogously to the method in that in each case a mixing chamber of a spray nozzle is supplied with the respective amount of lubricating oil not only via a single oil inlet opening in each case, but via a plurality of oil inlet openings in each case.

The advantageous embodiments of the device correspond to those of the method. Therefore, to avoid repetition, reference is made to the above comments on the method.

The above-described characteristics, features and advantages of this invention, as well as the manner in which these are achieved, will become clearer and more clearly understood in connection with the following description of the embodiments which will be described in conjunction with the drawings, in which:

1 shows a rolling stand and a flat rolling stock of the

Page,

2 shows the rolling mill and the rolling stock of FIG. 1 from above, FIG.

3 shows a spray nozzle in a sectional view,

4 shows a cross section through the spray nozzle of FIG. 3 along a line IV-IV of FIG. 3, FIG.

5 shows a cross-section corresponding to the representation of FIG. 4 through a further spray nozzle,

6 shows a volume-pressure diagram,

7 shows an embodiment of a nozzle outlet in a perspective view,

8 shows an embodiment of a nozzle outlet in a sectional view and

9 to 11 each show an arrangement of several spray nozzles.

According to FIGS. 1 and 2, a metallic flat rolling stock 1 m is rolled to a rolling stand 2. The rolling stock 1 is conveyed during rolling in a transporting direction x. The rolling mill 2 has at least work rolls 3. Often, the roll stand 2 additionally support rollers 4 and optionally also other, not shown in the FIG rollers.

When the rolling stock 1 is rolled in the roll stand 2, a lubricating oil 5 is applied to the rolling stock 1 and / or at least one of the rolls 3, 4 of the roll stand 2, as shown in FIGS. As shown in FIG 1 lubricating oil 5 is applied to the top of the rolled stock 1 and the upper work roll 3. However, as far as the upper side of the rolling stock 1 is concerned, it is sufficient that lubricating oil 5 is applied to the upper side of the rolling stock 1 or to the upper working roll 3. Furthermore, as an alternative or in addition to applying the lubricating oil 5 to the upper side of the rolling stock 1 and / or on the upper working roll 3, lubricating oil 5 could be applied to another roll 4 arranged above the rolling stock 1, for example onto the upper support roll 4 or (in FIG Trap of a six-high stand) on the upper intermediate roll.

A device for applying the lubricating oil 5 to the upper side of the rolling stock 1 and / or at least one roller 3, 4 arranged above the rolling stock 1 has, as shown in FIGS. 1 and 2, a spray bar 6. The spray bar 6 extends parallel to a respective axis of rotation 3 'of the work rolls 3. On the spray bar 6 several spray nozzles 7 are arranged side by side. The spray nozzles 7 are usually constructed equal to each other. The structure of one of the spray nozzles 7 will be explained in more detail below in connection with FIGS. 3 and 4.

Furthermore, lubricating oil 5 is generally also applied to the underside of the rolling stock 1 and / or to at least one lower roll 3, 4. This is not shown in FIGS 1 and 2 for reasons of clarity. In an analogous manner for applying the lubricating oil 5 on the upper side of the rolling stock 1 and / or on the upper work roll 3 and / or on another above the rolling stock 1 arranged roller 4, the application of the lubricating oil 5 also with respect to the underside of the rolling stock 1 as needed (Direct) on the lower side of the rolling stock 1 and / or on the lower work roll 3 and / or on another below the Walzguts 1 arranged roll 4 take place. Furthermore, at least one spray bar 6 is arranged below the rolling stock 1 in this case. According to FIG. 3, the spray nozzles 7 each have a mixing chamber 8. Furthermore, the spray nozzles 7 each have a plurality of oil inlet openings 9. Minimal are two oil inlet openings

9 available. However, there may be more than two oil inlet openings 9. Via the oil inlet openings 9, a respective amount V of lubricating oil 5 is supplied to the respective mixing chamber 8 per unit of time. Furthermore, the mixing chambers 8 each have at least one air inlet opening 10. Via the respective air inlet opening 10 of the respective mixing chamber 8 compressed air 11 is supplied. Within the respective mixing chamber 8, the supplied lubricating oil 5 is atomized by means of the compressed air 11 to form an aerosol. The atomized lubricating oil 5 is sprayed on in each case at least one nozzle outlet 12 of the respective spray nozzle 7 on the rolling stock 1 and / or the corresponding roll 3, 4 of the roll stand 2.

As shown in FIG. 3, the spray nozzles 7 are preferably cylindrical. They thus have a respective longitudinal axis 13. The nozzle outlets 12 are preferably arranged at one of the axial ends of the respective spray nozzle 7. The respective at least one air inlet opening

10 is arranged in this case at the respective other axial end of the respective spray nozzle 7.

Relative to one of the spray nozzles 7, one of the oil inlet openings 9, viewed in the direction of the longitudinal axis 13, is arranged at a defined axial position z. At least one further of the oil inlet openings 9 is preferably arranged at the same axial position z in the direction of the longitudinal axis 13. Often, even all oil inlet openings 9 of the respective spray nozzle 7 are arranged at this axial position z.

As shown in FIG. 3, the at least one air inlet opening 10 preferably has a diameter d 1. which is between 0.01 mm and 5 mm. Preferably, the diameter dl of the air inlet openings 10 is between 3 mm and 5 mm. In particular, the diameter dl of the air inlet openings 10 may be at least 4 mm. The oil inlet openings 9, however, also have a diameter d2. The diameter d2 of the oil inlet openings 9 is preferably between 0.1 mm and 1.0 mm. In particular, the diameter d2 of the oil inlet openings 9 is usually between 0, 4 mm and 0, 6 mm.

As can be seen particularly clearly from FIG. 4 for the case of two oil inlet openings 9 and from FIG. 5 for the case of three oil inlet openings 9, the oil inlet openings are preferably distributed uniformly around the longitudinal axis 13. In relation to the longitudinal axis 13, the oil inlet openings 9 thus preferably form an angle of 180 ° and in the case of three oil inlet openings 9 in each case an angle of 120 ° in the case of two oil inlet openings 9. Generally - ie in the case of n oil inlet openings 9 - each two oil inlet openings 9 thus preferably form with the longitudinal axis 13 an angle of 360 ° / n.

As shown by way of example in FIG 2 for one of the spray nozzles 7, the lubricating oil 5 of the respective mixing chamber 8 is preferably supplied flow-controlled. For this purpose, as shown in FIG 2, a conveyor 14 and a flow regulator 15 are present. The flow regulator 15 is supplied with a set volume flow V * and an actual volume flow V conveyed from the delivery device 14 to the respective mixing chamber 8. Based on the nominal volume flow V * and the

Actual volume flow V, the flow controller 15 determines a control signal for the conveyor 14, so that the

Actual volume flow V to the target volume flow V * is approximated - as equalized - is. Due to the promotion of the volumetric flow, a pressure builds up in the feed line carrying the lubricating oil 5. This pressure is not regulated in the context of the present invention. It usually sets between 1.5 bar and 20 bar, in particular between 2.0 bar and 15 bar. A pressure p which the compressed air 11 supplied to the respective mixing chamber 8 has is preferably between 0.1 bar (= 10 hPa) and 10 bar (= 1000 hPa). In particular, the pressure p can be between 1.0 bar (= 100 hPa) and 6.0 bar (= 600 hPa). It is possible that the pressure p constantly has the corresponding value. Preferably, however, the pressure p is set as a function of the amount of lubricating oil 5-that is, one of the volume flows V, V *. 6 shows an example of a corresponding representation. In FIG. 6, the amount of lubricating oil 5 applied to the right, which is supplied to the mixing chamber 8 per unit of time, is applied to the right. Upwards, in FIG. 6, the assigned pressure p of the compressed air

11 applied. According to the illustration in FIG. 6, it is possible, in particular, for the pressure p to increase with the amount of lubricating oil 5 which is supplied to the respective mixing chamber 8 per unit of time. The relationship dp / dV> 0 or dp / dV *> 0 therefore preferably applies. The nozzle outlets 12 can be designed as required.

Preferably, the nozzle outlets 12 are formed according to the illustration in Figures 7 and 8 respectively slit-shaped. In particular, the spray nozzles 7 can each have two such nozzle outlets

12 have. By means of such nozzle outlets 12, a relatively wide, fan-like, uniform jet can be effected in a particularly simple manner.

As shown in FIG. 9, the nozzle outlets 12 are at a distance al from the surface to which the lubricating oil 5 is sprayed. The surface may alternatively be an area of the rolled stock 1 or a surface of one of the rolls 3, 4. The distance al is preferably between 100 mm and 400 mm. In particular, it can be between 150 mm and 300 mm. Furthermore, the spray nozzles 7, as shown in FIG 9, a distance a2 from each other. The distance a2 extends parallel to the axes of rotation 3 'of the work rolls 3. The distance a2 is preferably between 50 mm and 300 mm. In particular, it can be between 100 mm and 200 mm. Of each one of the spray nozzles 7, the lubricating oil 5 is sprayed as shown in FIG 9 only on a respective portion 16 of the rolling stock 1 and / or the corresponding roller 3, 4. By means of the spray bar 6 - so the

Injection nozzles 7 in their entirety, on the other hand, the lubricating oil 5 is uniformly applied to the rolling stock 1 and / or the corresponding roll 3, 4 at least across the width b 1 of the rolling stock 1 - often even across the full width b 2 of the corresponding roll 3, 4. brought. In order to ensure such a uniform application, the distances al of the nozzle outlets 12 from the rolling stock 1 and from the corresponding rollers 3, 4 and the distances a2 of the spray nozzles 7 from each other depending on the respective spray pattern each set one of the spray nozzles 7.

Depending on the circumstances of the individual case, the adjustment can be made in such a way that the partial regions 16 assigned to the directly adjacent spray nozzles 7 have a degree of coverage which is 50%. In this case, the partial area 16 of a specific spray nozzle 7 as shown in FIG. 9 extends to the middle of the two partial areas 16 immediately adjacent to this partial area 16. Thus, with respect to a specific partial area 16, there is a left-hand section and a right-hand section. On the right section 7 of the right adjacent spray nozzle 7 lubricating oil 5 applied. In an analogous manner 7 lubricating oil 5 is applied to the left portion of the left adjacent spray nozzle. On the other hand, there is no section of the partial region 16 to which lubricating oil 5 is applied exclusively by the spray nozzle 7 assigned to the partial region 16.

Alternatively, depending on the circumstances of the individual case, the setting can be made such that the partial regions 16 assigned to the directly adjacent spray nozzles 7 have an overlapping degree which is 0%. In this case, the portion 16 of a particular spray nozzle 7 as shown in FIG 10 extends only to the edge of the two directly adjacent to this portion 16 portions 16. Die Subregions 16 adjoin each other in this case without overlapping. There is therefore, with respect to a specific portion 16, no section on which also of the right or left adjacent spray nozzle 7 lubricating oil 5 is applied.

In most cases, however, the setting will be selected such that the immediately adjacent spray nozzles 7 are assigned

Subregions 16 have a degree of coverage that lies between these two extreme values. Thus, with regard to a specific subarea 16, there is a left section and a right section. On the right section 7 lubricating oil 5 is also applied by the right adjacent spray nozzle. In an analogous manner 7 lubricating oil 5 is applied to the left portion of the left adjacent spray nozzle. In contrast to the embodiment according to FIG. 9, a middle section of the partial region 16, onto which lubricating oil 5 is applied exclusively by the assigned spray nozzle 7, exists between these two sections. For example, the setting can be selected such that the immediately adjacent spray nozzles 7 associated partial areas 16 have a degree of coverage, which is between 15% and 40%, in particular between 20% and 30%. FIG. 11 shows purely by way of example such a setting in which the degree of overlap is approximately 25%.

In summary, the present invention thus relates to the following facts:

By means of several juxtaposed spray nozzles 7 lubricating oil 5 is sprayed when rolling a metallic flat rolled stock 1 in a rolling stand 2 on the rolling stock 1 and / or at least one roller 3, 4 of the roll stand 2. In each case a mixing chamber 8 of a spray nozzle 7, a respective amount of lubricating oil 5 is supplied via a plurality of oil inlet openings 9. The respective mixing chamber 8 is supplied via at least one air inlet opening 10 compressed air 11. The lubricating oil 5 is atomized by means of the compressed air 11 in the respective mixing chamber 8 to form an aerosol and over each at least one nozzle outlet 12 sprayed onto the rolling stock 1 and / or the at least one roller 3, 4 of the roll stand 2.

The present invention has many advantages. In particular, a large adjustment range of the delivered volume flow V of lubricating oil 5 can be realized in a simple manner. Furthermore, due to the presence of several oil inlet openings 9, the reliability of the spray nozzles 7 is significantly increased. Furthermore, the spray pattern of the spray nozzles 7 corresponding to the respective partial region 16 can be maintained almost constant over the entire control range of the delivered volume flow V. The total amount of lubricating oil 5 required can be minimized. Nevertheless, results over the entire effective width of an oil film with a very uniform thickness.

Although the invention has been further illustrated and described in detail by the preferred embodiment, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

LIST OF REFERENCE NUMBERS

1 rolling stock

2 rolling stand

3 work rolls

3 'rotation axes

4 back-up rolls

5 lubricating oil

6 spray bars

7 spray nozzles

8 mixing chamber

9 oil inlets

10 air inlet opening

11 compressed air

12 nozzle outlets

13 longitudinal axis

14 conveyor

15 flow regulator

16 subareas al, a2 distances

bl, b2 widths

dl, d2 diameter

p pressure

V, V * Volume flows x Transport direction z Axial position

Claims

Claims / Patent Claims

1. A method for applying a lubricating oil (5) when rolling a metallic flat rolled stock (1) in a roll stand (2), - wherein the lubricating oil (5) by means of a plurality of juxtaposed spray nozzles (7) on the rolling stock (1) and / or at least one roller (3, 4) of the roll stand (2) is sprayed on,

- In each case a mixing chamber (8) of a spray nozzle (7) via a plurality of oil inlet openings (9) a respective amount of lubricating oil (5) is supplied,

- wherein the respective mixing chamber (8) via at least one air inlet opening (10) compressed air (11) is supplied,

- wherein the lubricating oil (5) by means of the compressed air (11) in the j eweiligen mixing chamber (8) atomized to an aerosol and j eweils at least one nozzle outlet (12) on the rolling stock (1) and / or the at least one roller (3 , 4) of the roll stand (2) is sprayed.

2. The method according to claim 1,

characterized ,

in that the spray nozzles (7) are of cylindrical design, so that they have a respective longitudinal axis (13), that the nozzle outlets (12) are arranged at one of the axial ends of the respective spray nozzle (7) and that in each case at least one air inlet opening (10). is arranged at the other axial end of the respective spray nozzle (7).

3. The method according to claim 2,

characterized ,

that, relative to one of the spray nozzles (7), one of the oil inlet openings (9) is arranged at a defined axial position (z) in the direction of the longitudinal axis (13) and at least one further of the oil inlet openings (9) is arranged in the direction of the longitudinal axis (13 ) is arranged at the same axial position (z).

4. The method according to claim 3,

characterized ,

the oil inlet openings (9) arranged at the defined axial position (z) are arranged distributed uniformly around the longitudinal axis (13).

5. The method according to any one of the above claims,

characterized ,

the lubricating oil (5) is fed to the respective mixing chamber (8) in a flow-controlled manner.

6. The method according to any one of the above claims,

characterized ,

the compressed air (11) fed to the respective mixing chamber (8) has a pressure (p) which is between 0.1 bar and 10 bar, in particular between 1.0 bar and 6.0 bar.

7. Method according to one of the above claims,

characterized ,

in that a pressure (p) with which the compressed air (11) is supplied to the respective mixing chamber (8) is adjusted as a function of the quantity of lubricating oil (5) supplied to the respective mixing chamber (8).

8. The method according to claim 7,

characterized ,

the pressure (p) with which the compressed air (11) is supplied to the respective mixing chamber (8) is equal to that of the respective one

Mixing chamber (8) supplied amount of lubricating oil increases.

9. Method according to one of the above claims,

characterized ,

the at least one air inlet opening (10) has a diameter (d1) which lies between 0.01 mm and 5 mm, preferably between 3 mm and 5 mm, in particular at least 4 mm.

10. The method according to any one of the above claims,

characterized ,

the oil inlet openings (9) have a diameter (d2) which lies between 0.1 mm and 1.0 mm, in particular between 0.4 mm and 0.6 mm.

11. The method according to any one of the above claims,

characterized ,

the nozzle outlets (12) are each slit-shaped.

12. The method according to any one of the above claims,

characterized ,

the nozzle outlets (12) of the rolling stock (1) and / or the at least one roll (3, 4), on which the lubricating oil (5) is sprayed, have a spacing (a1) which lies between 100 mm and 400 mm , in particular between 150 mm and 300 mm.

13. The method according to any one of the above claims,

characterized ,

the spray nozzles (7) have a distance (a2) from one another which is between 50 mm and 300 mm, in particular between 100 mm and 200 mm.

14. Method according to one of the above claims,

characterized ,

in that the lubricating oil (5) injected by one of the spray nozzles (7) onto the rolling stock (1) and / or the at least one roller (3, 4) strikes a respective portion (16) of the rolling stock (1) and / or the at least one a roller (3, 4) is sprayed on and that the immediately adjacent spray nozzles (7) associated sub-areas (16) have a degree of coverage, which is between 0% and 50%.

15. Apparatus for applying a lubricating oil (5) to metallic flat rolled stock (1) and / or at least one roll (3, 4) of a rolling stand (2) during rolling of the rolled stock (1) in the rolling stand (2), - wherein the device comprises a spray bar (6) which extends parallel to a rotation axis (3 ') of the at least one roller (3, 4) of the roll stand (2) and on which a plurality of spray nozzles (7) are arranged side by side,

- wherein the spray nozzles (7) each have a mixing chamber (8) which is supplied via a plurality of oil inlet openings (9) a respective amount of lubricating oil (5),

- wherein the respective mixing chamber (8) in each case at least one air inlet opening (10) via which the respective mixing chamber (8) compressed air (11) is supplied,

- wherein the spray nozzles (7) each have at least one nozzle outlet (12) via which in the respective mixing chamber (8) to an aerosol atomized lubricating oil (5) on the rolling stock (1) and / or the at least one roller (3, 4) of the roll stand (2) is sprayed.

16. The device according to claim 15,

characterized ,

17. Device according to claim 16,

characterized ,

18. Device according to claim 17,

characterized ,

that at the defined axial position (z) arranged Oil inlet openings (9) are arranged around the longitudinal axis (13) arranged around evenly distributed view.

19. Device according to one of claims 15 to 18,

characterized ,

20. Device according to one of claims 15 to 19,

characterized ,

21. Device according to one of claims 15 to 20,

characterized ,

the nozzle outlets (12) are each slit-shaped.

22. Device according to one of claims 15 to 21,

characterized ,

23. Device according to one of claims 15 to 22,

characterized ,

24. Device according to one of claims 15 to 23,

characterized ,

in that of each one of the spray nozzles (7) sprayed on the rolling stock (1) and / or the at least one roller (3, 4) Lubricating oil (5) on a respective portion (16) of the rolling stock (1) and / or the at least one roller (3, 4) is sprayed and that the immediately adjacent spray nozzles (7) associated subregions (16) have a degree of coverage, the between 0% and 50%.