Method and device for rolling stock and use of a cooling lubricant

Patent metadata

Field	Value
Publication number	US-9700924-B2
Application number	US-201214369444-A
Country	US
Kind code	B2
Filing date	Dec 14, 2012
Priority date	Dec 29, 2011
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A method for rolling rolling stock, wherein a water-based cooling lubricant is applied to the rolling stock and/or to at least one roller which forms a roll gap, at least one water-soluble and tribologically active additive being added to the water-based cooling lubricant prior to application to the rolling stock and/or to the at least one roller.

First claim

The invention claimed is:

1. A method for rolling of rolling stock ( 1 ), comprising the steps of: applying a water-based cooling lubricant to the rolling stock ( 1 ) and/or to at least one roll of a pair of rolls ( 20 , 22 , 30 , 32 ) forming a roll gap ( 200 , 300 ); adding at least one water-soluble, tribologically active additive to the water-based cooling lubricant before the water-based cooling lubricant is applied to the rolling stock and/or to the at least one roll; collecting excess cooling lubricant after application to the rolling stock ( 1 ) and/or to the at least one roll ( 20 , 22 , 30 , 32 ) whereupon the excess cooling lubricant is used again for application to the rolling stock ( 1 ) and/or to the at least one roll ( 20 , 22 , 30 , 32 ); continuously filtering the excess cooling lubricant after the excess cooling lubricant has been applied but before the excess cooling lubricant is reapplied so as to filter material abraded from the rolls in a section of a particle spectrum in which a largest lengthwise dimension of a single particle is less than 5 μm; determining with a sensor an accumulation of the water-soluble additive on the rolling stock ( 1 ) and/or on the at least one roll ( 20 , 22 , 30 , 32 ) resulting from evaporation of a portion of the water-based lubricant; and adding additional of the water-soluble additive to the filtered excess-cooling lubricant based on the accumulation of the water-soluble additive on the rolling stock and/or on the at least one roll before the excess-cooling lubricant is used again for application to the rolling stock and/or to the at least-one roll.

2. A method according to claim 1 , wherein the at least one water-soluble, tribologically active additive is selected to suit an individual rolling situation.

3. A method according to claim 1 , wherein the water-based cooling lubricant together with the water-soluble, tribologically active additive is applied to the rolling stock ( 1 ) and/or to the rolls ( 20 , 22 , 30 , 32 ) forming the roll gap ( 200 , 300 ) as a function of a rolling situation.

4. A method according to claim 1 , wherein, before the filtered cooling lubricant is applied again to the rolling stock ( 1 ) and/or to the roll ( 20 , 33 , 30 , 32 ), the at least one water-soluble, tribologically active additive is re-added to reestablish a desired additive concentration in the cooling lubricant.

5. A method according to claim 1 , wherein the accumulation of the additive on the rolling stock ( 1 ) and/or on the at least one roll ( 20 , 22 , 30 , 32 ) is determined via an evaluation of measured rolling process data under inclusion of a suitable tribological rolling gap model, and the addition of the water-soluble, tribologically active additive is controlled so that a desired additive accumulation is achieved.

6. A method according to claim 1 , wherein an additive accumulation on the rolling stock ( 1 ) leaving the roll gap ( 200 , 300 ) is determined based on an additive layer remaining on the rolling stock ( 1 ), and the addition of the water-soluble, tribologically active additive is controlled accordingly in an open-loop or closed-loop manner.

7. A method according to claim 1 , wherein a metered addition of the water-soluble, tribologically active additive is controlled in an open-loop or closed-loop manner based on a continuous measurement of abraded roll particles in the collected cooling lubricant.

8. A method according to claim 1 , wherein an amount of water-soluble, tribologically active additive added to the cooling lubricant applied to a top of the rolling stock ( 1 ) and/or to an upper roll ( 20 ) is different from an amount added to the cooling lubricant applied to a bottom of the rolling stock ( 1 ) and/or to a lower roll ( 22 ).

9. A method according to claim 1 , wherein an amount of water-soluble, tribologically active additive added is varied over time.

10. A method according to claim 1 , wherein at least one additional water-soluble additive is metered into the cooling lubricant.

11. A device for rolling of rolling stock ( 1 ), comprising: rolls ( 20 , 22 , 30 , 32 ) that form a roll gap ( 200 , 300 ); apparatus arranged to apply a water-based cooling lubricant to the rolling stock ( 1 ) and/or to at least one of the rolls ( 20 , 22 , 30 , 32 ) forming the roll gap a device for adding a water-soluble, tribologically active additive to the water-based cooling lubricant; at least one filter device ( 8 ) for continuous filtration of collected cooling lubricant, the filter device being configured to filter material abraded from the rolls in a section of a particle spectrum in which a largest lengthwise dimension of a single particle is less than 5 μm; and, a device arranged to determine an accumulation of the water-soluble additive on the rolling stock and/or on at least one of the rolls resulting from evaporation of a portion of the water-based lubricant; wherein the device for adding the water-soluble additive adds additional of the water-soluble additive to the filtered excess-cooling lubricant based on the accumulation of the water-soluble additive on the rolling stock and/or on the at least one roll before the excess-cooling lubricant is used again for application to the rolling stock and/or to the at least one roll.

12. A device according to claim 11 , further comprising a metering device ( 6 ) for adding the water-soluble, tribologically active additive to the cooling lubricant under open-loop or closed-loop control.

13. A method according to claim 2 , wherein the additive is selected to suit a material of the rolling stock and/or desired tribological conditions in the roll gap.

14. A method according to claim 3 , wherein the water-based cooling lubricant together with the water-soluble, tribologically active additive is applied by adjusting application conditions.

15. A method according to claim 14 , wherein the water-based cooling lubricant together with the water-soluble, tribologically active additive is applied by changing entrance temperature, application pressure, manner of application, and location of application.

16. A method according to claim 4 , wherein the at least one water-soluble, tribologically active additive is re-added based on a determination of a depletion of the additive.

17. A method according to claim 16 , wherein the depletion is determined by a continuous measurement of relative permittivity and/or specific electrical conductivity of the cooling lubricant.

18. A method according to claim 7 , wherein the metered addition of the water-soluble, tribologically active additive is controlled using a database for comparison, which database contains data on the roll material, roughness of the rolls, type of roll, the rolling stock, an alloy, a reduction-per-pass plan, and a suitable tribological process model.

19. A method according to claim 10 , wherein the at least one additional water-soluble additive is metered into the cooling lubricant to balance an action of the cooling lubricant between a washing effect and a lubricating effect.

20. A method according to claim 10 , wherein the at least one additional water-soluble additive is metered into the cooling lubricant as a function of a desired surface appearance.

Assignees

• Sms Siemag Ag
• Sms Group Gmbh

Inventors

• Kohlrausch Arnt
• Pawelski Hartmut
• Jepsen Olaf Norman

Classifications

• B21B45/0206

  Coolants · CPC title

• B21B27/10

  externally · CPC title

• B21B2027/103

  cooling externally · CPC title

• B21B45/0242 Primary

  Lubricants · CPC title