Rolling mill and rolling method
Disclosed is a rolling mill, in particular a rolling mill having more than one mill stand, comprising at least two rolls ( 30 ) which are mounted in a roll bearing in a mill stand to absorb rolling forces, further comprising means ( 40 ) for moving at least one roll relative to the mill stand as well as means ( 50 ) for determining the roll pass, the determining means having a pass reference ( 54 ) and a spatial reference ( 56 ) as well as means ( 58 ) for measuring the relative position between the pass reference and the spatial reference. In order to create a rolling mill that provides as accurate information as possible about the roll pass, the pass reference and/or the spatial reference is/are arranged peripherally in relation to the power flow occurring between the roll and the mill stand.
1. A rolling mill comprising:
a roll stand,
a first roll mounted in the roll stand in a first roll bearing,
a second roll mounted in the roll stand in a second roll bearing, said roll stand absorbing rolling forces via said first and second roll bearings and said first and second rolls,
a displacement device configured to displace at least the first roll with reference to the roll stand,
a spatial reference support attached independent of the roll stand or attached to the roll stand, and
a determining device for determining the roll pass,
wherein the determining device comprises:
a pass reference,
a locally fixed spatial reference locally fixed to the spatial reference support, and
a measuring device for measuring the relative position between the pass reference and the locally fixed spatial reference with contact, and
wherein the pass reference is disposed at a distance from the first roll bearing of less than one bearing diameter of the first roll bearing.
2. The rolling mill according to claim 1 , wherein the pass reference and/or the locally fixed spatial reference is/are disposed peripheral to the force flow, with reference to a force flow that occurs between the roll and the roll stand.
3. The rolling mill according to claim 2 , wherein the locally fixed spatial reference is disposed outside of a force introduction region in which the rolling forces are introduced into the roll stand.
4. The rolling mill according to claim 3 , further comprising a plurality of determining devices for determining the roll pass,
wherein each determining device comprises a respective spatial reference,
wherein each spatial reference is disposed outside of a force introduction region in which the rolling forces are introduced into the roll stand.
5. The rolling mill according to claim 2 , wherein the locally fixed spatial reference is disposed on the roll stand in a vicinity of a neutral region of the roll stand, between two force introduction regions in which the rolling forces are introduced into the roll stand.
6. The rolling mill according to claim 2 , wherein the pass reference is disposed on a projection free of rolling forces.
7. The rolling mill according to claim 1 , wherein at least one of the first and second rolls is mounted in a bearing body and the pass reference is disposed on the bearing body.
8. The rolling mill according to claim 7 , wherein the bearing body has a rocker having a bearing side that serves as the bearing body, wherein the displacement device acts on the bearing side, wherein the rocker has a guide side, and wherein the pass reference is provided on the side of the bearing side facing away from the guide side.
9. The rolling mill according to claim 1 , wherein the measurement device comprises a distance measurement device that measures the distance between the pass reference and the locally fixed spatial reference.
10. The rolling mill according to claim 1 , wherein the locally fixed spatial reference is disposed separate from the roll stand.
11. The rolling mill according to claim 1 , further comprising an off-line calibration device that allows a measurement of the roll pass directly on at least one roll.
12. The rolling mill according to claim 11 , further comprising a regulation circuit for regulating the roll pass, which regulation circuit comprises the determining device, and further comprising an input device for measurement results of the off-line calibration device as a guide variable of the regulation circuit, as a correction variable for the setting variable of the regulation circuit and/or as a correction variable for the determining device or the displacement device.
13. The rolling mill according to claim 1 , wherein the spatial reference support is not movably attached.
14. The rolling mill according to claim 1 , wherein the measuring device comprises a measurement foot;
wherein the measurement foot comprises a measurement tip; and
wherein the measurement foot is disposed either on the pass reference or on the locally fixed spatial reference such that the measurement tip sits on a related counter-piece of the pass reference or of the locally fixed spatial reference.
15. A method for positioning rolls, the method comprising steps of:
providing a rolling mill comprising:
a roll stand,
a first roll mounted in the roll stand in a first roll bearing,
a second roll mounted in the roll stand in a second roll bearing,
a displacement device configured to displace at least the first roll with reference to the roll stand,
a spatial reference support attached independent of the roll stand or attached to the roll stand, and
a determining device for determining a roll pass,
wherein the determining device comprises:
a pass reference,
a locally fixed spatial reference locally fixed to the spatial reference support, and
a measuring device for measuring the relative position between the pass reference and the locally fixed spatial reference with contact, and
wherein the pass reference is disposed at a distance from the first roll bearing of less than one bearing diameter of the first roll bearing;
calibrating the determining device off-line;
determining a roll pass via the determining device measuring the relative position between the pass reference and the locally fixed spatial reference with contact;
positioning on-line the first roll and the second roll to a desired roll pass, taking into consideration the roll pass determined via the determining device; and
absorbing rolling forces of the first and second rolls via the first and second roll bearings and via the roll stand.
16. Rolling method according to claim 15 , wherein the position of the rolls is measured directly for off-line calibration.
17. Rolling method according to claim 15 , wherein positioning of the rolls takes place within a regulation circuit, taking measurement results of the determining device into consideration.