Width controlling apparatus and method for rolled strips

Claim 2

A width controlling apparatus for rolled strips, for use in a hot tandem rolling mill, comprising tensioning means for applying tension to a hot rolled strip passing between the forward rolling mill stands, looper means for maintaining the tension of the rolled strip substantially constant which is passing between the rearward rolling mill stands after its width has been controlled by said tensioning means, means for measuring the width of the rolled strip, first means for generating a signal representative of a predetermined strip width, second means for generating a deviation signal upon comparing a signal from said measuring means with the signal from said first means, and means for adding said deviation signal to said tensioning means as a compensation signal.

Claim 3

A width controlling apparatus for rolled strips, for use in a hot tandem rolling mill, comprising tensioning means for applying tension to a hot rolled strip passing between the rolling mill stands, means for measuring the width of the rolled strip, first means for generating a signal representative of a predetermined strip width, second means for generating a deviation signal upon comparing a signal from said strip width measuring means with the signal from said first means, means for simulating the desired tension to be applied to the rolled strip from various factors of said rolled strip and said deviation signal, and means for applying a signal from said simulating means to said tensioning means.

Claim 4

A width controlling apparatus for rolled strips, for use in a hot tandem rolling mill, comprising tensioning means for applying tension to a hot rolled strip passing between the rolling mill stands, means for measuring the width of the rolled strip, first means for generating a signal representative of a predetermined strip width, second means for generating a deviation signal upon comparing a signal from said strip width measuring means with the signal from said first means, means for simulating the desired tension to be applied to the rolled strip from various factors of said rolled strip and said deviation signal, and means for applying a signal from said simulating means to said tensioning means.

Claim 5

A strip width controlling apparatus for rolled strips in a hot tandem rolling mill having a plurality of mill stands, the control apparatus comprising: means disposed between at least a pair of adjacent mill stands for applying tension to a hot rolled strip passing therebetween; means for maintaining the tension of the rolled strips substantially constant after its strip width has been controlled by said tensioning means; means for measuring the width of the rolled strip, said measuring means being disposed downstream of said tensioning means; means for calculating a desired tension value by utilizing measurements of the strip width as an input, and tension control means for sending an output to said tensioning means by utilizing the desired tension value as an input.

Claim 6

A strip width controlling apparatus for rolled strips in a hot tandem rolling mill having a plurality of mill stands, the control apparatus comprising: means disposed between at least a pair of adjacent mill stands for applying tension to a hot rolled strip passing therebetween; means for maintaining the tension of the rolled strips substantially constant after its strip width has been controlled by said tensioning means; means for measuring the width of the rolled strip, said measuring means being disposed downstream of said tensioning means; means for calculating a desired tension value by utilizing measurements of the strip width as an input, and tension control means for sending an output to said tensioning means by utilizing the desired tension value as an input.

Claim 7

A strip width controlling apparatus for rolled strip in a hot tandem rolling mill, the control apparatus comprising: tensioning means for applying tension to a hot rolled strip passing between rolling mill stands of the hot tandem rolling mill; means for measuring the tension, means for measuring the width of the rolled strip; means for simulating a desired tension and a desired depression ratio by utilizing tension measurements and strip width measurements as an input; means for controlling roll speed of said rolled strip by utilizing the simulated tension and depression ratio as an input signal; and means for controlling the roll depression by utilizing the simulated signals of the tension and depression ratio as an input signal.

Claim 8

A strip width controlling apparatus for rolled strip in a hot tandem rolling mill, the control apparatus comprising: tensioning means for applying tension to a hot rolled strip passing between rolling mill stands of the hot tandem rolling mill; means for measuring the tension, means for measuring the width of the rolled strip; means for simulating a desired tension and a desired depression ratio by utilizing tension measurements and strip width measurements as an input; means for controlling roll speed of said rolled strip by utilizing the simulated tension and depression ratio as an input signal; and means for controlling the roll depression by utilizing the simulated signals of the tension and depression ratio as an input signal.

Claim 9

A width controlling apparatus according to claim 4, wherein the hot tandem rolling mill includes a pair of rolling mill stands, and wherein said means for measuring the width of the rolled strips is disposed downstream of the second of said pair of rolling mill stands.

Claim 10

A wiDth controlling apparatus according to claim 5, wherein said means for applying tension includes a tensioning roll disposed between said pair of rolling mill stands.

Claim 11

A width controlling apparatus according to claim 5, wherein a tensioning gauge is disposed between said pair of rolling mill stands.

Claim 12

A width controlling apparatus according to claim 4, wherein the hot tandem rolling mill has at least three rolling mill stands, and wherein said means for measuring the width of the rolled strip is disposed downstream of the last of said rolling mill stands, and wherein means are provided between at least the second and third roll mill stand for maintaining the strip width substantially constant.

Claim 13

A width controlling apparatus according to claim 8, wherein said means for applying tension includes a tensioning roller disposed between the first and second rolling mill stands.

Claim 14

A width controlling apparatus according to claim 8, wherein a tension gauge is disposed at least between the first and second rolling mill stands.

Claim 15

A width controlling arrangement according to claim 4, wherein means are provided downstream of a rolling mill stand for compensating for an insufficient strip width correction in said rolling mill stand.

Claim 16

A width controlling arrangement according to claim 11, wherein said compensating means includes at least one tensioning roller disposed between adjacent rolling mill stands.

Claim 17

A width controlling apparatus according to claim 4, wherein said means for measuring the width of the rolled strip is disposed upstream of a first rolling mill stand.

Claim 18

A width controlling apparatus according to claim 13, wherein said means for applying tension includes at least one tensioning roller disposed between at least a pair of adjacent rolling mill stands.

Claim 19

A width controlling apparatus according to claim 13, wherein at least one tensioning gauge is disposed between at least a pair of adjacent rolling mill stands.

Claim 20

A width controlling apparatus according to claim 4, wherein a pair of width measuring means are provided.

Claim 21

A width controlling arrangement according to claim 16, wherein at least one of said pair of width measuring means is disposed upstream of a first rolling mill stand.