Method and device for controlling a roll gap
AssigneeABB AB
InventorLars Jonsson
Life of this patent
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Abstract
The invention relates to a method and a device for controlling a roll gap when rolling a strip (1) in a rolling mill including at least two rolls (3a-b,4a-b), and at least two roll gap actuators (6,7) that independently control the size of the roll gap. The device is adapted to receive information on the amount of wedge shape (POSactOS,POSactDS) in the strip thickness profile across the strip width, and to control said actuators, based on said information on the amount of wedge shape in the strip thickness profile, such that the relative reduction of the strip on both sides of the rolling mill become essentially the same.
Claims23
A method for controlling a roll gap when rolling a strip (1) having lateral edges in a rolling mill including at least two rolls (3a-b,4a-b), and at least two roll gap actuators (6,7) positioned to be adjacent the respective lateral edges of the strip (1) and which independently control size of the roll gap, wherein the method comprises the steps of:
- receiving information on amount of wedge shape (H, POSactOS, POSactDS) in strip thickness profile across strip width,
- determining relative reduction of the strip (1) by the formulas
- Δh/H or Δh/h, where
- Δh=H−h, with H denoting thickness of the strip (1) before entering the roll pap and h denoting thickness of the strip after passing through the roll gap, and
- based thereon, controlling said actuators (6, 7) such that the relative reduction (Δh) of the strip (1) at both edges of the strip (1) is substantially identical.
A method for controlling a roll gap when rolling a strip (1) having lateral edges in a rolling mill and including at least two rolls (3a-b,4a-b), and at least two roll gap actuators (6,7) positioned to be adjacent the respective lateral edges of the strip (10) and which independently control size of the roll gap, wherein
- the method comprises:
- receiving information on amount of wedge shape (H, POSactOS, POSactDS) in strip thickness profile across strip width, and based thereon, and
- controlling said actuators such that relative reduction of the strip at both edges of the strip (1) is substantially identical, and
- said information on the amount of wedge shape in the strip thickness profile includes actual positions (POSactOS, POSactDS) of said roll gap actuators.
A device for controlling a roll gap when rolling a strip (1) having lateral edges in a rolling mill having two sides and including at least two rolls (3a-b,4a-b), and at least two roll gap actuators (6,7) positioned to be adjacent the respective lateral edges of the strip (1) and which independently control size of the roll gap, wherein the device is adapted to
- receive information on amount of wedge shape (H, POSactOS, POSactDS) in strip thickness profile across strip width,
- determine relative reduction of the strip (1) by the formulas
- Δh/H or Δh/h, where
- Δh=H−h, with H denoting thickness of the strip (1) before entering the roll gap and h denoting thickness of the strip after passing through the roll gap, and
- control said actuators (6,7), based on said information on the amount of wedge shape in the strip thickness profile, such that relative reduction (Ah) of the strip (1) at both edges of the strip (1) is substantially identical.
A device for controlling a roll gap when rolling a strip (1) having two sides in a rolling mill and including at least two rolls (3a-b,4a-b), and at least two roll gap actuators (6,7) positioned to be adjacent the respective lateral edges of the strip (1) and which independently control size of the roll gap, wherein the device is adapted to receive information on amount of wedge shape (H, POSactOS, POSactDS) in strip, thickness profile across strip width, and control said actuators, based on said information on the amount of wedge shape in the strip thickness profile, such that relative reduction of the strip (1) at both edges of the strip (1) is substantially identical, and said information on the amount of wedge shape includes actual positions (POSactOS, POSactDS) of said roll gap actuators.
A device for controlling a roll gap when rolling a strip (1) having lateral edges in a rolling mill, comprising
- two main rolls (3a, 3b) positioned to apply pressure to the strip (1), and
- two support rolls (4a, 4b) each positioned against a respective one of said main rolls (3a, 3b) on a side of the respective main roll (3a, 3b) opposite the strip (1),
- at least two roll gap actuators (6,7) arranged to contact one (4a) of said two support rolls (4a, 4b) adjacent the respective lateral edges of the strip (1) and independently control size of the roll gap,
- wherein the device is adapted to receive information on amount of wedge shape (H, POSactOS, POSactDS) in strip thickness profile across strip width, and control said actuators (6, 7), based on said information on the amount of wedge shape in the strip thickness profile, such that relative reduction of the strip at both edges of the strip (1) is substantially identical.
Dependencies are inferred from the claim text.