Rolling installation for and rolling method of continuous cast strip
AssigneeHitachi, Ltd.
InventorTomoaki Kimura
Life of this patent
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Abstract
A rolling installation comprises a continuous casting machine, and a light thickness-reduction rolling mill, a width-reduction rolling mill and a thickness-reduction rolling mill which are arranged downstream of the continuous casting machine. The light thickness-reduction rolling mill is driven with a power lower than that required for thickness-reduction rolling by the light thickness-reduction rolling mill. The power deficiency is supplied to the light thickness-reduction rolling mill by the thickness-reduction rolling mill through the cast strip. As a result, a longitudinal tension is applied to the cast strip passing through the width-reduction rolling mill, thereby preventing the cast strip from being buckled and deformed at the width-reduction rolling.
Claims12
A method of rolling a continuous cast strip to reduce its width, comprising the steps of:
- forming the continuous cast strip by a continuous casting machine;
- before cutting the cast strip, delivering the cast strip to a width-reduction rolling mill through a looper arranged between the continuous casting machine and the width-reduction rolling mill, including forming a loop amount of the cast strip with said looper;
- and
- rolling the cast strip to reduce its width while applying a longitudinal tension to the cast strip as it passes through the width-reduction rolling mill by applying a braking force to hold the cast strip on the upstream side of the width-reduction rolling mill and by exerting a driving force on the cast strip on the downstream side of the width-reduction rolling mill.
A casting/rolling apparatus for casting and rolling a continuous cast strip to reduce its width without cutting the cast strip, comprising:
- a continuous casting machine for forming the continuous cast strip;
- a width-reduction rolling mill arranged downstream of said continuous casting machine receiving the continuous cast strip from said continuous casting machine;
- a looper arranged between the continuous casting machine and said width-reduction rolling mill;
- and
- tension applying means for applying a longitudinal tension to the cast strip as it passes through said width-reduction rolling mill, said tension applying means including pressing roll pairs arranged respectively on an upstream side and a downstream side of said width-reduction rolling mill, means for driving said pressing roll pairs, and means for controlling said driving means sot hat said downstream pressing roll pair applies a driving force on said cast strip to move it through said width-reduction rolling mill and said upstream pressing roll pair exerts a braking force for slowing the movement of said cast strip whereby a difference int he braking and holding forces causes the longitudinal tension in said cast strip.
A method of rolling a continuous cast strip to reduce its width, comprising the steps of:
- forming the continuous cast strip by a continuous casting machine;
- delivering the cast strip to a width-reduction rolling mill without cutting the cast strip through a looper;
- detecting a loop amount of the cast strip formed by the looper;
- rolling the cast strip to reduce its width while applying a longitudinal tension to the cast strip as it passes through the width-reduction rolling mill by applying a braking force with a pair of upstream rolls to hold the cast strip on the upstream side of the width-reduction rolling mill and by exerting a driving force with a pair of downstream rolls on the cast strip on the downstream side of the width=reduction rolling mill, and further controlling the speed of the downstream pair of rolls in accordance with the detected loop amount to maintain the loop amount at a predetermined value.
A casting/rolling apparatus for casting and rolling a continuous cast strip to reduce its width without cutting the cast strip, comprising:
- a continuous casting machine for forming the continuous cast strip;
- a width-reduction rolling mill arranged downstream of said continuous casting machine receiving the continuous cast strip from said continuous casting machine;
- a looper for forming a loop amount of the cast strip arranged between the continuous casting machine and the width-reduction rolling mill having means for detecting a loop amount and outputting a detected value;
- tension applying means for applying a longitudinal tension to the cast strip as it passes through said width-reduction rolling mill, said tension applying means including pressing roll pairs arranged respectively on an upstream side and a downstream side of said width-reduction rolling mill, means for driving said pressing roll pairs, and means receiving said detected value for controlling said driving means so that said downstream pressing roll pair applies a driving force on said cast strip to move it through said width-reduction rolling mill to maintain the loop amount at a predetermined amount and said upstream pressing roll pair exerts a braking force for slowing the movement of said cast strip whereby a difference int he braking and holding forces causes the longitudinal tension in said cast strip.
Dependencies are inferred from the claim text.