Method of strip elongation control in continuous annealing furnaces
AssigneeSelas Corporation of America
InventorsEugene A. Cook, Robert J. Mieloo
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Abstract
Strip elongation in a continuous annealing furnace is controlled by passing the strip around a first driven roll, then through a portion of the furnace, then around a second driven roll, wherein the elongation of the strip is sensed. One method is to sense the amount by which the peripheral speed of the second roll exceeds the peripheral speed of the first roll. Roll speeds are monitored by precision resolvers. Another method is to utilize a strip width measurement to determine elongation. Mechanisms are used for profiling tension throughout the furnace length.
Claims18
A method of controlling elongation of a strip of metal in at least a portion of a continuous annealing furnace, comprising the steps of:
- a) passing a strip of metal around a first driven roll upstream of said portion of the furnace, thence through said portion of the furnace, thence around a second driven roll downstream of said portion of the furnace, the strip undergoing frictional contact with both rolls, and
- a.sup.1) sensing the elongation of the strip by measuring the peripheral speed of the first and second rolls, and
- b) controlling the strip elongation in response to the sensed elongation by adjusting the amount by which the peripheral speed of the second roll exceeds the peripheral speed of the first roll.
A method of controlling elongation of a strip of metal in at least a portion of a continuous annealing furnace comprising the steps of:
- a) passing a strip of metal around a first driven roll upstream of said portion of the furnace, then through said portion of the furnace, thence around a second driven roll downstream of said portion of the furnace, the strip undergoing frictional contact with both rolls, and
- a.sup.1) sensing the elongation of the strip by measuring the difference in width of the strip between the first and second rolls,
- b) controlling strip elongation in response to the sensed elongation by adjusting the amount by which the peripheral speed of the second roll exceeds the peripheral speed of the first roll.
A method of controlling elongation of a strip of metal in at least a portion of a continuous annealing furnace, comprising the steps of:
- a) passing a strip of metal around a first driven roll upstream of said portion of the furnace, thence through said portion of the furnace, thence around a second driven roll downstream of said portion of the furnace, the strip undergoing frictional contact with both rolls, and
- a.sup.1) sensing the elongation of the strip, and
- b) controlling strip elongation which does not require load cells by adjusting the amount by which the peripheral speed of the second roll exceeds the peripheral speed of the first roll in response to the sensed elongation.
A method of controlling elongation of a strip of metal in at least a portion of a continuous annealing furnace, comprising the steps of:
- a) passing a strip of metal around a first driven roll upstream of said portion of the furnace, thence through said portion of the furnace, thence around a second driven roll downstream of said portion of the furnace, the strip undergoing frictional contact with both rolls, and
- a.sup.1) sensing the elongation of the strip by measuring the peripheral speed of the first and second rolls or by measuring the difference in width of the strip between the first and second rolls, and
- b) controlling strip elongation in response to the sensed elongation by adjusting the amount by which the peripheral speed of the second roll exceeds the peripheral speed of the first roll.
Dependencies are inferred from the claim text.