Method and apparatus for coiling a metal strip
AssigneeKawasaki Steel Corporation
InventorsTaichi Kukizaki, Toshio Imazeki, Kiyoshi Ueda
Life of this patent
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Abstract
It is adapted such that, when coiling a thin metal strip at high speed, no shape defect owing to a center buckle occurs in the metal strip, thereby intending an improvement in yield. In a method of coiling a metal strip, adapted such that, before the coiling is finished, wrapper rolls 6 are pushed against an outer coiling face of a coil 5 to brake a rotation of the coil 5 and, by this, the rotation of the coil 5 is stopped in a short time at a coiling finish time, a pushing force of the wrapper roll 6 is made 10-20 kN/m.
Claims7
A method of coiling a metal strip, adapted such that, before the metal strip after a hot finish rolling is finished to be coiled on a mandrel, plural wrapper rolls are pushed against an outer coiling face of a coil to brake a rotation of the coil, thereby stopping the rotation of the coil,
- characterized in that a position of a step portion appearing in an outer coiling face of the coil owing to a step between a most tip portion of an inner coiling face of the coil and a surface of the mandrel is detected, and a pushing force of the wrapper roll is made 20 kN/m or lower only during a predetermined time before and after the step portion passes a position of the wrapper roll,
- the metal strip being coiled having a thickness of about 2.3 mm or less, and coiling on the mandrel being performed at a coiling speed of greater than about 700 m per minute.
Dependencies are inferred from the claim text.