Plate thickness control device of tandem cold mill

Abstract

The invention provides a plate thickness control device for a tandem cold mill. Even when a plate thickness gauge is not arranged on an inlet side of a final frame, thickness variation of the inlet side of the final frame can be suppressed, so as to seek accuracy improvement of thickness of a product. The plate thickness control device of the tandem cold mill includes a mass flow plate thickness calculating unit (41) and a second plate thickness control unit (42). The mass flow plate thickness calculating unit (41) calculates mass flow plate thickness of the inlet side of the nth frame (5) based on a measured value of outlet side plate thickness measured by the outlet side plate thickness gauge (10), a measured value of outlet side plate speed measured by an outlet side plate speedometer (9), and a measured value of inlet side plate speed measured by an inlet side plate speedometer (8). The second plate thickness control unit (42) controls rolling load in the (n-1)th frame (4) so thatmass flow plate thickness calculated by the mass flow plate thickness calculating unit (41) and a target value of the inlet side plate thickness of the nth frame (5) are the consistent.

Description

technical field

[0001] The present invention relates to a thickness control device for a tandem cold rolling mill, and more particularly to a thickness control device for a tandem cold rolling mill for controlling a rolled material to a desired thickness in relation to a process of rolling a metal or the like. Background technique

[0002] In recent years, the precision required for the plate thickness of the rolled piece has been continuously improved. Especially in the case of electrical steel sheets, since the steel sheets are laminated when manufacturing electric motors or transformers, high-precision thickness control is required.

[0003] Generally, a tandem cold rolling mill is provided with a plurality of plate thickness gauges, a plate speed gauge, and a tension gauge, and the plate thickness is controlled so that the plate thickness becomes a specified product plate thickness. Various board thickness control devices have been developed heretofore.

[0004] For ex...

Examples

Embodiment approach 1

[0042]

[0043] figure 1 It is a figure for demonstrating the structure of the tandem cold rolling strip thickness control system concerning Embodiment 1 of this invention. The tandem cold rolling mill according to Embodiment 1 includes a plurality of rolling stands. figure 1 A tandem cold rolling mill with 5 rolling stands is described in .

[0044] The 5 rolling stands are the first stand 1, the second stand 2, the third stand 3, the fourth stand 4 and the fifth stand 5 from the upstream side. The five rolling stands are opposite to each other. piece 6 to direction 7 ( figure 1 rolling from left to right).

[0045] Each stand has work rolls, speed control and reduction control. Specifically, the i-th stand (i is a natural number, and i≦n, n=5) has: a pair of i-th work rolls (11-15) for rolling the rolling stock 6; an i-th speed control device (21-25) for controlling the peripheral speed; and an i-th reduction control device (31-35) for controlling the roll gap of the ...

Embodiment approach 2

[0073]

[0074] Below, refer to image 3 , Embodiment 2 of the present invention will be described. image 3 It is a figure for demonstrating the structure of the continuous cold rolling strip thickness control system concerning Embodiment 2 of this invention. image 3 The system configuration shown is the same as that of figure 1 same.

[0075] The system according to Embodiment 2 is the same as that of Embodiment 1, but differs in that it calculates the thickness of the exit side of the third stand 3 and controls it to a target thickness. Hereinafter, only operations different from Embodiment 1 will be described.

[0076]

[0077] The thickness calculation unit 43 at the entrance side of the stand receives the actual rolling load measurement value measured by the fourth reduction control device 34 (n-1th reduction control device), and is controlled by the fourth speed control device 24 (n-1th speed control device). device) measured the work roll peripheral speed of t...

technical field

[0001] The present invention relates to a thickness control device for a tandem cold rolling mill, and more particularly to a thickness control device for a tandem cold rolling mill for controlling a rolled material to a desired thickness in relation to a process of rolling a metal or the like. Background technique

[0002] In recent years, the precision required for the plate thickness of the rolled piece has been continuously improved. Especially in the case of electrical steel sheets, since the steel sheets are laminated when manufacturing electric motors or transformers, high-precision thickness control is required.

[0003] Generally, a tandem cold rolling mill is provided with a plurality of plate thickness gauges, a plate speed gauge, and a tension gauge, and the plate thickness is controlled so that the plate thickness becomes a specified product plate thickness. Various board thickness control devices have been developed heretofore.

[0004] For ex...

Examples

Embodiment approach 1

[0042]

[0043] figure 1 It is a figure for demonstrating the structure of the tandem cold rolling strip thickness control system concerning Embodiment 1 of this invention. The tandem cold rolling mill according to Embodiment 1 includes a plurality of rolling stands. figure 1 A tandem cold rolling mill with 5 rolling stands is described in .

[0044] The 5 rolling stands are the first stand 1, the second stand 2, the third stand 3, the fourth stand 4 and the fifth stand 5 from the upstream side. The five rolling stands are opposite to each other. piece 6 to direction 7 ( figure 1 rolling from left to right).

[0045] Each stand has work rolls, speed control and reduction control. Specifically, the i-th stand (i is a natural number, and i≦n, n=5) has: a pair of i-th work rolls (11-15) for rolling the rolling stock 6; an i-th speed control device (21-25) for controlling the peripheral speed; and an i-th reduction control device (31-35) for controlling the roll gap of the ...

Embodiment approach 2

[0073]

[0074] Below, refer to image 3 , Embodiment 2 of the present invention will be described. image 3 It is a figure for demonstrating the structure of the continuous cold rolling strip thickness control system concerning Embodiment 2 of this invention. image 3 The system configuration shown is the same as that of figure 1 same.

[0075] The system according to Embodiment 2 is the same as that of Embodiment 1, but differs in that it calculates the thickness of the exit side of the third stand 3 and controls it to a target thickness. Hereinafter, only operations different from Embodiment 1 will be described.

[0076]

[0077] The thickness calculation unit 43 at the entrance side of the stand receives the actual rolling load measurement value measured by the fourth reduction control device 34 (n-1th reduction control device), and is controlled by the fourth speed control device 24 (n-1th speed control device). device) measured the work roll peripheral speed of t...

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