Hot-rolling stand for a hot-rolling mill and for producing a flat metal product, hot-rolling mill and method for operating a hot-rolling mill
AssigneeSMS group GmbH
InventorsJens Kreikemeier, Gokhan Erarslan, Stephan Fischer, Joachim Hafer
Life of this patent
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Abstract
A hot-rolling stand (10) for a hot-rolling mill comprises an adjusting device (12), which is intended for receiving a pair of work rolls (17) and for positioning work rolls (18, 19; 20, 21) of the pair of work rolls (17) in relation to one another to define a roll gap. In order to create a hot-rolling stand (10) that can be adapted as flexibly as possible, the adjusting device (12) is designed to interchangeably accommodate, in the pair of work rolls (17), different roll diameter ranges by means of mutually complementary work rolls (18, 19; 20, 21).
Claims16
A hot-rolling stand (10) for a hot-rolling mill (1) and for producing a flat metal product, comprising:
- a pair of work rolls (17), including
- an upper work roll (19;
- 21) having an upper coupling sleeve (40;
- 41), and
- a lower work roll (18;
- 20) having a lower coupling sleeve (38;
- 39);
- an adjusting device (12) for accommodating the pair of work rolls (17) and for positioning the upper work roll (19;
- 21) and the lower work roll (18, 20) of the pair of work rolls (17) in relation to one another to define a roll gap;
- a drive motor (33);
- a pinion gearbox (35) having an input connected to the drive motor (33);
- an upper spindle (37) connecting an upper output of the pinion gearbox (35) to the upper work roll (19;
- 21), the upper spindle (37) having an upper spindle sleeve (43) that accommodates the upper coupling sleeve (40;
- 41);
- a lower spindle (36) connecting a lower output of the pinion gearbox (35) to the lower work roll (18;
- 20), the lower spindle (36) having a lower spindle sleeve (42) that accommodates the lower coupling sleeve (38;
- 39),
- wherein the adjusting device (12) is designed to interchangeably accommodate, in the pair of work rolls (17), different roll diameter ranges of mutually complementary work rolls (18, 19;
- 20, 21),
- wherein the upper spindle (37) and the lower spindle (36) are designed to support a deflection that results from the different roll diameter ranges of the mutually complementary work rolls (18, 19;
- 20, 21),
- wherein a deviation between the different roll diameter ranges amounts to ≥6%, and
- wherein a pass line variation when using the different roll diameter ranges amounts to less than +/−20 mm.
A method for operating a hot-rolling mill (1), comprising the following method steps:
- a) determining operating parameters of a production sequence, the operating parameters including a pass reduction and an operating mode, the production sequence being defined by end products being produced that differ in one or more of a material, a target dimension, or a desired degree of deformation;
- b) determining a currently selected roll diameter range of work rolls (18, 19;
- 20, 21) of a pair of work rolls (17) of at least one hot-rolling stand (10), the at least one hot-rolling stand (10) comprising
- an adjusting device (12) for accommodating a pair of work rolls (17) and for positioning work rolls (18, 19;
- 20, 21) of the pair of work rolls (17) in relation to one another to define a roll gap,
- wherein the adjusting device (12) is designed to interchangeably accommodate, in the pair of work rolls (17), different roll diameter ranges of mutually complementary work rolls (18, 19;
- 20, 21),
- wherein a deviation between the different roll diameter ranges amounts to ≥6%, and
- wherein a pass line variation when using the different roll diameter ranges amounts to less than +/−20 mm;
- c) checking whether the currently selected roll diameter range matches the operating parameters of the production sequence,
- wherein, if the currently selected roll diameter range does not match the operating parameters of the production sequence, a change of work rolls (18, 19;
- 20, 21) in pairs of the pair of work rolls (17) with a change of the roll diameter range of the work rolls (18, 19;
- 20, 21) is carried out at the at least one hot-rolling stand (10) and/or a change of the production sequence is carried out, and wherein subsequently the method is initiated again with step a), and
- wherein, if the currently selected roll diameter range does match the operating parameters of the production sequence, the rolling operation is carried out without any change.
Dependencies are inferred from the claim text.