Lubrication using spray nozzles having multiple oil inlet openings

Patent metadata

Field	Value
Publication number	US-10780475-B2
Application number	US-201415109067-A
Country	US
Kind code	B2
Filing date	Nov 18, 2014
Priority date	Jan 8, 2014
Publication date	Sep 22, 2020
Grant date	Sep 22, 2020

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 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 ). Compressed air ( 11 ) atomizes the lubricating oil ( 5 ) 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 ).

First claim

The invention claimed is:

1. A method for applying a lubricating oil during rolling of a flat metal rolling stock in a roll stand comprising:
rolling the flat metal rolling stock in the roll stand wherein the roll stand includes at least one roll which rolls the rolling stock;
spraying the lubricating oil onto the rolling stock rolling past the roll stand and/or onto the at least one roll of the roll stand by a plurality of spray nozzles arranged in a series across the rolling stock, the spraying comprises:
feeding into a mixing chamber of each spray nozzle from a respective supply line a respective quantity of the lubricating oil via a respective oil inlet opening connected directly to the respective supply line that feeds the lubricating oil into the mixing chamber;
feeding the respective mixing chamber of each spray nozzle with compressed air via at least one air inlet opening into the mixing chamber for atomizing the lubricating oil in the respective mixing chamber by means of the compressed air to form an aerosol in the mixing chamber;
controlling flow of volume of the lubricating oil that is fed to the mixing chamber of each of the plurality of spray nozzles without directly controlling pressure of the lubricating oil in the respective supply line;
setting a pressure at which the compressed air is fed to the mixing chambers as a function of the volume of lubricating oil that is fed to the mixing chamber;
spraying the aerosol comprised of the lubricating oil onto the rolling stock rolling past the roll stand and/or onto the at least one roll of the roll stand via at least one nozzle outlet of each spray nozzle from the mixing chamber;
wherein the spray nozzles are cylindrical such that they each have a respective longitudinal axis, each nozzle outlet is at one axial end of the respective spray nozzle, the at least one air inlet opening is at an opposite axial end of the respective spray nozzle; and
for each one of the spray nozzles, one of the oil inlet openings thereof is at a defined axial position in the direction of the longitudinal axis, and at least one other of the oil inlet openings is arranged at the same axial position in the direction of the longitudinal axis.

2. The method as claimed in claim 1 , wherein the oil inlet openings of each of the spray nozzles are arranged at the defined axial position on the respective spray nozzle and the oil inlet openings are evenly distributed around the longitudinal axis on the respective spray nozzle.

3. The method as claimed claim 1 , further comprising:
feeding the compressed air to the respective mixing chamber at a pressure between 0.1 bar and 10 bar.

4. The method as claimed in claim 1 , further comprising increasing the pressure at which the compressed air is fed to the respective mixing chamber in line with the quantity of lubricating oil fed to the respective mixing chamber.

5. The method as claimed in claim 1 , wherein the at least one air inlet opening has a diameter between 0.01 mm and 5 mm.

6. The method as claimed in claim 1 , wherein each oil inlet opening has a diameter between 0.1 mm and 1.0 mm.

7. The method as claimed in claim 1 , wherein each nozzle outlet is embodied as slit-shaped.

8. The method as claimed in claim 1 , wherein the nozzle outlets are spaced away from the rolling stock and/or from the at least one roll onto which the lubricating oil is sprayed by the nozzle outlets, at a distance away between 100 mm and 400 mm.

9. The method as claimed in claim 1 , wherein the spray nozzles are spaced apart from one another across the rolling stock by a distance between 50 mm and 300 mm.

10. The method as claimed in claim 1 , further comprising spraying the lubricating oil onto the rolling stock and/or the at least one roll by each spray nozzle onto a respective subarea of the rolling stock and/or of the at least one roll, such that subareas for immediately adjacent spray nozzles have a degree of overlap that lies between 0% and 50%.

11. A device for applying a lubricating oil to flat metal rolling stock which passes a roll stand and/or to at least one roll of the roll stand during rolling of the rolling stock in the roll stand, the device comprising:
a roll stand configured to move the rolling stock through the roll stand;
a spray bar which extends across the rolling stock and parallel to an axis of rotation of the at least one roll of the roll stand;
a plurality of spray nozzles arranged adjacent to one another and along the spray bar, each spray nozzle includes a mixing chamber and a respective oil inlet opening directly connected to a respective supply line to feed lubricating oil into the mixing chamber;
at least one air inlet opening into each mixing chamber via which compressed air is fed to the respective mixing chamber for atomizing the lubricating oil to form an aerosol in the mixing chamber;
each of the spray nozzles has at least one nozzle outlet from the mixing chamber via which the lubricating oil atomized in the respective mixing chamber is sprayed onto the rolling stock and/or the at least one roll of the roll stand;
the spray nozzles are cylindrical such that they each have a respective longitudinal axis;
the at least one nozzle outlet is at one axial end of the respective spray nozzles;
the at least one air inlet opening to each mixing chamber is at another axial end of the respective spray nozzle;
one of the oil inlet openings of each of the spray nozzles is arranged at a defined axial position along the direction of the longitudinal axis, and at least one other of the oil inlet openings is at the same defined axial position, viewed along the direction of the longitudinal axis; and
a conveying device; and
a flow controller;
wherein the flow controller determines a control signal for the conveying device based on a set point volume flow of the lubricating oil and an actual volume flow of the lubricating oil to the mixing chambers to control volume flow of the lubricating oil to the mixing chambers without directly controlling a pressure of the lubricating oil in the supply lines.

12. The device as claimed in claim 11 , wherein the oil inlet openings arranged at the defined axial position are uniformly distributed around the longitudinal axis.

13. The device as claimed in claim 11 , wherein the at least one air inlet opening has a diameter between 0.01 mm and 5 mm.

14. The device as claimed in claim 11 , wherein the oil inlet openings have a diameter between 0.1 mm and 1.0 mm.

15. The device as claimed in claim 11 , wherein the nozzle outlets are slit shaped.

16. The device as claimed in claim 11 , wherein the nozzle outlets are spaced away from the rolling stock and/or from the at least one roll onto which the lubricating oil is sprayed by the nozzle outlets at a distance between 100 mm and 400 mm.

17. The device as claimed in claim 11 , wherein the spray nozzles are spaced apart from one another across the rolling stock by a distance between 50 mm and 300 mm.

18. The device as claimed in claim 11 , wherein the at least one nozzle outlet of each spray nozzle is configured to spray the lubricating oil onto a respective subarea, and the immediately adjacent subareas have a degree of overlap that lies between 0% and 50%.

Assignees

• Primetals Technologies Austria GmbH

Inventors

• Boehm Martin
• Braidt Thomas
• Dirisamer Gernot
• Krimpelstaetter Konrad
• Vipavc Daniel

Classifications

• B21B45/02 Primary

  for lubricating, cooling, or cleaning {(in particular in combination with forging or pressing devices B21B15/005, control of flatness or profile using lubricating or cooling B21B37/44)} · CPC title

• B21B45/0233

  Spray nozzles, Nozzle headers; Spray systems · CPC title

• B05B7/0846

  with jets being only jets constituted by a liquid or a mixture containing a liquid · CPC title

• B05B7/0483

  with gas and liquid jets intersecting in the mixing chamber · CPC title

• B05B7/0876

  to form parallel jets constituted by a liquid or a mixture containing a liquid (B05B7/0884, B05B7/0892 take precedence) · CPC title