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US 2018/0141095 A1Published application
Method for the stepped rolling of a metal strip
AssigneeGiebel Kaltwalzwerk GmbH
InventorStephan SCHARFENORTH
Life of this patent
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Abstract
A method for the stepped rolling of a metal strip unwinds the metal strip by a feed reel device and winds-up the metal strip by a winding reel device. The metal strip is guided through a roller gap formed between two working rollers during the rolling process, and the roller gap is changed in a controlled manner during the rolling process, whereby a thickness of the metal strip is changed in steps in the longitudinal direction during the rolling process. Tension applied to the metal strip is controlled such that the rolling force applied to the metal strip by the working rollers is constant during the rolling process.
Claims8
1:
- Method for stepped rolling of a metal strip (4), wherein the metal strip (4) is unwound from the decoiler apparatus (5) and wound up by a coiler apparatus (6), wherein the metal strip (4) is guided through a roll gap (3) formed between two working rolls (1, 2), during the rolling process, and the roll gap (3) is changed in targeted manner during the rolling process, wherein for this purpose, a strip thickness of the metal strip (4) is changed in stepped manner, in the longitudinal direction (7), during the rolling process, wherein
- a strip tension applied to the metal strip (4) is controlled, in targeted manner, in such a manner that the rolling force (W) applied to the metal strip (4) by the working rolls (1, 2) is constant during the rolling process.
2:
- Method according to claim 1, wherein
- the approximately constant rolling force (W) changes during the rolling process only to the extent that the elastic deformation of the working rolls (1, 2) is constant or approximately constant during the rolling process.
3:
- Method according to claim 1,
- wherein
- a forward strip tension (σ1) applied to the coiler apparatus and/or a reverse strip tension (σ0) applied by the decoiler apparatus (5) is controlled during the rolling process.
4:
- Method according to claim 1,
- wherein
- the geometry of transitions, particularly their gradient and the radii of transition points (12, 13, 14, 15) is influenced between the strip thickness of the metal strip (4), which is changed in steps, by means of targeted strip tension control and targeted control of the speed of rotation and setting speed of the working rolls (1, 2).
5:
- Method according to claim 3,
- wherein
- for reduction of the strip thickness, the roll gap (3) is reduced, and the forward strip tension (σ1) and the reverse strip tension (σ0) are increased.
6:
- Method according to claim 3,
- wherein
- for increasing the strip thickness, the roll gap (3) is increased in size, and the forward strip tension (σ1) and the reverse strip tension (σ0) are lowered.
7:
- Method according to claim 1,
- wherein
- the setting speed of the working rolls (1, 2) and/or the speed of rotation of the working rolls (1, 2), of the decoiler apparatus (5) and/or of the coiler apparatus (6) are controlled in accordance with precalculated speed data.
8:
- Apparatus for carrying out a method according to claim 1, comprising at least two working rolls (1, 2), which form a roll gap (3), a decoiler apparatus (5), a coiler apparatus (6), and setting means and control means (9), by means of which setting of the working rolls (1, 2), the speed of rotation of the working rolls (1, 2), and the speed of rotation of the decoiler apparatus (5) and/or the coiler apparatus (6) can be adjusted and/or controlled.