Rolling of a rolled material

Abstract

The invention relates to a method and a rolling device for rolling a rolled material. The rolled material is guided through a roll gap between two working rollers of a reversing roll stand, alternatingly in two opposing rolling directions. A lubricant for lubricating a contact zone is introduced into the contact zone in which the rolled material is in contact with the working rollers, and a coolant is applied to the rolled material and/or the working rollers. In a mixture with a carrier gas, the lubricant is sprayed onto the working rollers and/or onto the rolled material exclusively on an outlet side of a pass. The coolant is applied to the working rollers and/or to the rolled material exclusively on an inlet side of a pass.

Claims

1. A method for rolling a rolled material, comprising: guiding the rolled material alternatingly in two mutually opposite rolling directions through a roll gap between two working rollers of a reversing roll stand; introducing a lubricant for lubricating the two working rollers; applying a coolant to at least one of the two working rollers and the rolled material; wherein the lubricant is dispensed in a mixture with a carrier gas, wherein the mixture is sprayed onto the two working rollers exclusively on a run-out side of a rolling pass, the run-out side being where the rolled material runs out of the roll gap; and wherein the coolant is dispensed onto the at least one of the two working rollers and the rolled material exclusively on a run-in side of the rolling pass, the run-in side being where the rolled material runs into the roll gap.

2. The method as claimed in claim 1, wherein the lubricant is a lubricating oil.

3. The method as claimed in claim 1, wherein water is used as the coolant.

4. The method as claimed in claim 1, wherein a cooling emulsion is used as the coolant.

5. The method as claimed in claim 4, wherein the coolant contains at least one emulsifier, which improves the adhesion of the lubricant to at least one of the two working rollers and the rolled material.

6. The method as claimed in claim 1, wherein the mixture of the lubricant and the carrier gas is sprayed the rolled material when the rolled material is being guided through the roll gap in both rolling directions.

7. A method for rolling a rolled material, comprising: guiding the rolled material alternatingly in a first and a second rolling direction through a roll gap between two working rollers of a reversing roll stand, the first rolling direction being opposite to the second rolling direction; introducing a lubricant for lubricating a contact zone into the contact zone in which the rolled material bears against the working rollers; applying a coolant to at least one of the working rollers and the rolled material; wherein the lubricant is dispensed in a mixture with a carrier gas, wherein the mixture is sprayed onto at least one of the working rollers and the rolled material exclusively on a run-out side of a rolling pass, the run-out side being where the rolled material runs out of the roll gap; wherein the coolant is dispensed onto the at least one of the working rollers and the rolled material exclusively on a run-in side of the rolling pass, the run-in side being where the rolled material runs into the roll gap; wherein the mixture of the lubricant and the carrier gas is sprayed onto at least one of the working rollers and the rolled material when the rolled material is being guided through the roll gap in the first rolling direction; and wherein the mixture of the lubricant and the carrier gas is not sprayed onto at least one of the working rollers and the rolled material when the rolled material is being guided through the roll gap in the second rolling direction.

8. A method for rolling a rolled material, comprising: guiding the rolled material alternatingly in two mutually opposite rolling directions through a roll gap between two working rollers of a reversing roll stand; introducing a lubricant for lubricating a contact zone into the contact zone in which the rolled material bears against the two working rollers; applying a coolant to at least one of the two working rollers and the rolled material; wherein the lubricant is dispensed in a mixture with a carrier gas, wherein the mixture is sprayed onto at least one of the two working rollers and the rolled material exclusively on a run-out side of a rolling pass, the run-out side being where the rolled material runs out of the roll gap; wherein the coolant is dispensed onto the at least one of the two working rollers and the rolled material exclusively on a run-in side of the rolling pass, the run-in side being where the rolled material runs into the roll gap; and wherein, when the rolled material is being guided through the roll gap for a first time, a rolled material head of the rolled material, which is a first region of the rolled material to be guided through the roll gap, is guided through the roll gap at a slower speed than the remaining region of the rolled material.

9. The method as claimed in claim 8, wherein, when the rolled material head is being guided through the roll gap for the first time, no coolant is dispensed onto the at least one of the two working rollers and onto the rolled material.

10. A rolling apparatus for rolling a rolled material, the rolling apparatus comprising: a reversing roll stand with two working rollers; at least one spraying bar on each side of the rolling stand configured to spray the mixture of the lubricant and the carrier gas onto the two working rollers; at least one cooling bar configured to dispense the coolant onto at least one of the two working rollers and onto the rolled material; and a controller is configured to control each spraying bar so that the mixture of the lubricant and the carrier gas is dispensed exclusively on the run-out side of the rolling pass; wherein the controller is configured to control each cooling bar so that the coolant is dispensed exclusively on the run-in side of the rolling pass.

11. The rolling apparatus as claimed in claim 10, wherein all the spraying bars are arranged on a same side of the reversing roll stand.

12. The rolling apparatus as claimed in claim 10, wherein the at least one spraying bar and the at least one cooling bar are arranged on at least one side of the reversing roll stand.

13. The rolling apparatus as claimed in claim 10, wherein: the at least one spraying bar is at least two spraying bars; and on at least one side of the reversing roll stand, a first one of the at least one spraying bars is arranged above a rolled material plane, in which the rolled material is guided, and a second one of the at least one spraying bars is arranged below the rolled material plane.

14. The rolling apparatus as claimed in claim 10, wherein, on at least one side of the reversing roll stand, at least one cooling bar is arranged above a rolled material plane, in which the rolled material is guided, and at least one cooling bar is arranged below the rolled material plane.

15. A rolling apparatus for rolling a rolled material, the rolling apparatus comprising: a reversing roll stand with an upper working roller and a lower working roller, the upper working roller and the lower working roller defining a roll gap and having a first side from which the rolled material is rolled into and out of the reversing roll stand, and a second side opposite the first side; two upper spraying bars configured to spray a mixture of a lubricant and a carrier gas onto at least the upper working roller, one of the two upper spraying bars being on the first side and the other of the two upper spraying bars being on the second side; two lower spraying bars configured to spray the mixture of the lubricant and the carrier gas onto at least the lower working roller, one of the two lower spraying bars being on the first side and the other of the two lower spraying bars being on the second side; two upper cooling bars configured to dispense a coolant onto at least one of the upper working roller and the rolled material, one of the two upper cooling bars being on the first side and the other of the two upper cooling bars being on the second side; two lower cooling bars configured to dispense a coolant onto at least one of the lower working roller and the rolled material, one of the two lower cooling bars being on the first side and the other of the two lower cooling bars being on the second side; and a controller is configured to control each spraying bar so that the mixture of the lubricant and the carrier gas is dispensed exclusively on a run-out side of a rolling pass, the run-out side being where the rolled material runs out of the roll gap; wherein the controller is configured to control each cooling bar so that the coolant is dispensed exclusively on a run-in side of the rolling pass, the run-in side being where the rolled material runs into the roll gap.

16. The rolling apparatus as claimed in claim 15, wherein the rolling apparatus is configured to perform a method for rolling a rolled material, the method comprising: guiding the rolled material alternatingly in two mutually opposite rolling directions through the roll gap; spraying the mixture of the lubricant and the carrier gas onto at least the upper working roller and the lower working roller; and dispensing the coolant onto at least one of the upper working, the lower working roller, and the rolled material.

17. The rolling apparatus as claimed in claim 15, wherein, when the rolled material is being guided through the roll gap for a first time, a rolled material head of the rolled material, which is a first region of the rolled material to be guided through the roll gap, is guided through the roll gap at a slower speed than the remaining region of the rolled material.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The above-described properties, features and advantages of this invention, and the manner in which these are achieved, will become clearer and more clearly comprehensible in conjunction with the following description of exemplary embodiments, which will be discussed in more detail in conjunction with the drawings, in which:

(2) FIG. 1 schematically shows a side view of a first exemplary embodiment of a rolling apparatus according to the invention, and

(3) FIG. 2 schematically shows a side view of a second exemplary embodiment of a rolling apparatus according to the invention.

(4) Mutually corresponding parts are provided with the same reference designations in the figures.

DETAILED DESCRIPTION

(5) FIG. 1 schematically shows a side view of a first exemplary embodiment of a rolling apparatus 1 according to the invention for rolling a rolled material 2. The rolled material 2 is a metallic rolled strip, for example a steel strip, the thickness of which is reduced by the rolling. The rolling apparatus 1 comprises a reversing roll stand 3, two spraying bars 5, 6, four cooling bars 9 to 12 and a control unit 27.

(6) The reversing roll stand 3 has two working rollers 23, 24 which are arranged one above the other and two back-up rollers 25, 26, wherein one back-up roller 25 is arranged above the two working rollers 23, 24 and the other back-up roller 26 is arranged below the two working rollers 23, 24. The two working rollers 23, 24 are spaced apart from one another by a roll gap 17.

(7) In order to roll the rolled material 2, the working rollers 23, 24 are set in rotation and the rolled material 2 is guided by the rotating working rollers 23, 24 alternatingly in two mutually opposite rolling directions through the roll gap 17. FIG. 1 shows a rolling pass in which the rolled material 2 is guided from left to right through the roll gap 17, such that the left-hand side of the reversing roll stand 3 is the run-in side of the rolling pass and the right-hand side of the reversing roll stand 3 is the run-out side of the rolling pass. In the subsequent rolling pass, the rolled material 2 is guided from right to left through the roll gap 17, such that the right-hand side of the reversing roll stand 3 is the run-in side of the rolling pass and the left-hand side of the reversing roll stand 3 is the run-out side of the rolling pass.

(8) The spraying bars 5, 6 are arranged on one side of the reversing roll stand 3, wherein one spraying bar 5 is arranged above a rolled material plane 19, in which the rolled material 2 is guided, and the other spraying bar 6 is arranged below the rolled material plane 19. Each spraying bar 5, 6 is configured to spray a mixture 20 (aerosol) of a lubricant 21, for example a lubricating oil, and a carrier gas onto the surface of a working roller 23, 24. To produce the mixture 20, each spraying bar 5, 6 has an atomization device (not illustrated in any more detail) to which the lubricant 21 and the carrier gas are supplied and which atomizes the lubricant 21 in the carrier gas. To dispense the mixture 20, each spraying bar 5, 6 has spray nozzles (likewise not illustrated in any more detail) which are configured to spray the mixture 20 onto the surface of a working roller 23, 24.

(9) The cooling bars 9 to 12 are arranged on both sides of the reversing roll stand 3, wherein, on each side of the reversing roll stand 3, a cooling bar 9, 11 is arranged above the rolled material plane 19 and a cooling bar 10, 12 is arranged below the rolled material plane 19. Each cooling bar 9 to 12 is configured to dispense a coolant 22 onto a surface of a working roller 23, 24 or/and a surface of the rolled material 2. To this end, each cooling bar 9 to 12 has, for example, spray nozzles (not illustrated in any more detail) by means of which the coolant 21 can be dispensed. The coolant 22 is for example water or a cooling emulsion containing water and a rolling oil, wherein the oil content of the cooling emulsion is less than ten percent by volume. The coolant 22 may also contain at least one emulsifier, which improves the adhesion of the lubricant 21 to the working rollers 23, 24 or/and to the rolled material 2.

(10) The spraying bars 5, 6 and the cooling bars 9 to 12 can be controlled by the control unit 27. The control unit 27 is configured to control the spraying bars 5, 6 and the cooling bars 9 to 12 in such a way that the mixture 20 is sprayed onto the working rollers 23, 24 exclusively on the run-out side of a rolling pass and the coolant 22 is dispensed onto the working rollers 23, 24 or/and onto the rolled material 2 exclusively on the run-in side of a rolling pass. Since the spraying bars 5, 6 are arranged only on one side of the reversing roll stand 3 in the exemplary embodiment shown in FIG. 1, it is thus the case in this exemplary embodiment that the mixture 20 is only sprayed onto the working rollers 23, 24 at most in every second rolling pass.

(11) Preferably, during the first rolling pass, a rolled material head of the rolled material 2, which is the first region of the rolled material 2 to be guided through the roll gap 17, is also guided through the roll gap 17 at a slower speed than the remaining region of the rolled material 2, and when the rolled material head is being guided through the roll gap 17 for the first time, no coolant 22 is dispensed onto the working rollers 23, 24 or/and onto the rolled material 2.

(12) FIG. 2 schematically shows a side view of a second exemplary embodiment of a rolling apparatus 1 according to the invention for rolling a rolled material 2. This exemplary embodiment differs from the first exemplary embodiment shown in FIG. 1 merely by the number and arrangement of spraying bars 5 to 8. In the second exemplary embodiment, on each side of the reversing roll stand 3, a spraying bar 5, 7 and a cooling bar 9, 11 are arranged above the rolled material plane 19 and a spraying bar 6, 8 and a cooling bar 10, 12 are arranged below the rolled material plane 19.

(13) In analogy to the first exemplary embodiment, the control unit 27 is configured to control the spraying bars 5 to 8 and the cooling bars 9 to 12 in such a way that the mixture 20 is sprayed onto the working rollers 23, 24 exclusively on a run-out side of a rolling pass and the coolant 22 is dispensed onto the working rollers 23, 24 or/and onto the rolled material 2 exclusively on a run-in side of a rolling pass. Since spraying bars 5 to 8 are arranged on both sides of the reversing roll stand 3 in the exemplary embodiment shown in FIG. 2, in contrast to the exemplary embodiment shown in FIG. 1, the mixture 20 can be sprayed onto the working rollers 23, 24 in each rolling pass. Like FIG. 1, FIG. 2 shows a rolling pass in which the rolled material 2 is guided from left to right through the roll gap 17, such that the run-in side of the rolling pass is the left-hand side of the reversing roll stand 3 and the run-out side of the rolling pass is the right-hand side of the reversing roll stand 3. Accordingly, during this rolling pass, the working rollers 23, 24 are sprayed with the mixture 20 only by the spraying bars 5, 6 arranged to the right of the reversing roll stand 3 and the coolant 22 is dispensed onto the working rollers 23, 24 and/or the rolled material 2 only by the cooling bars 11, 12 arranged to the left of the reversing roll stand 3.

(14) Although the invention has been illustrated and described in more detail on the basis of preferred exemplary embodiments, the invention is not restricted by the examples disclosed, and other variations can be derived therefrom by a person skilled in the art without departing from the scope of protection of the invention.

LIST OF REFERENCE DESIGNATIONS

(15) 1 Rolling apparatus 2 Rolled material 3 Reversing roll stand 5 to 8 Spraying bars 9 to 12 Cooling bars 17 Roll gap 19 Rolled material plane 20 Mixture 21 Lubricant 22 Coolant 23, 24 Working roller 25, 26 Back-up roller 27 Control unit