Steel strip rolling method and steel plate manufacturing method
A technology of steel strips and side plates, which is applied in the manufacture of tools, metal rolling, metal rolling, etc., can solve the problems of productivity, production volume decline, and manufacturing cost increase, and achieve the effect of improving yield and productivity
Inactive Publication Date: 2013-06-05
NIPPON STEEL CORP
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
Therefore, the damaged work rolls need to be replaced, and the batch type tandem cold rolling mill cannot be operated during the replacement period.
As a result, productivity and throughput decrease, and manufacturing costs increase accordingly
Method used
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Embodiment Construction
[0022] Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. figure 1 It is a schematic diagram which shows the structure of the tandem cold rolling mill which concerns on embodiment of this invention.
[0023] Such as figure 1 As shown, the tandem cold rolling mill 1 of the present embodiment includes a rolling stand unit 10 including four rolling stands 30a to 30d for rolling an electrical steel sheet strip S. As shown in FIG. An unwinding reel 11 is arranged on the upstream side of the rolling stand 10 , and a winding reel 12 is arranged on the downstream side of the rolling stand 10 . A tension roll 20 a is disposed between the unwinding reel 11 and the rolling stand 10 , and a tension roll 20 e is disposed between the winding reel 12 and the rolling stand 10 . The tandem cold rolling mill 1 further includes a control unit 100 that controls the rolling stand unit 10 , the unwinding reel 11 and the winding reel 12...
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Abstract
A tandem cold rolling mill comprising multiple rolling stands is utilized, opening of a roll gap between upper and lower work rolls in said rolling stands by a preset specific amount is started before the time at which the tail end of a steel strip reaches each of the aforementioned rolling stands, and the aforementioned opening is ended at or before the time at which the aforementioned tail end arrives. When the aforementioned opening is started and ended, if the entrance-side tension of said rolling stand has been kept at or above a preset second threshold value before the start of the aforementioned opening in said rolling stand, a target value for the entrance-side plate speed for rolling by said rolling stand is calculated when the entrance-side tension of said rolling stand is at or above a first threshold value after the aforementioned opening is started, and the rolling speed of another rolling stand positioned on the immediate upstream side of said rolling stand is controlled such that the exit-side plate speed of the aforementioned other rolling stand will fall within a constant range with reference to the aforementioned target value. If the entrance-side tension of said rolling stand has not been kept at or above the second threshold value before the aforementioned opening is started at said rolling stand, the aforementioned opening is started at the point when a specific amount of time has elapsed after the entrance-side tension of said rolling stand is at or lower than the aforementioned second threshold value.
Description
technical field [0001] The present invention relates to a steel sheet strip rolling method and a steel sheet manufacturing method using a tandem cold rolling mill. Background technique [0002] Batch tandem cold rolling mills are sometimes used to roll electrical steel strip. During such rolling, tailing of the tail end of the electrical steel sheet strip occurs. The deformation resistance of the electromagnetic steel strip is large, and the ductility of the electromagnetic steel strip is extremely low. Therefore, when tailing occurs, the upper work roll and the lower work roll of the rolling stand are likely to collide with each other. When such a collision occurs, the upper work roll and the lower work roll are damaged, and other electrical steel sheet strips are damaged during subsequent rolling. Therefore, the roll gap between the upper work roll and the lower work roll of the rolling stand is opened based on monitoring by an operator or the like. [0003] However, s...
Claims
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IPC IPC(8): B21B37/72B21B3/02B21B37/18
CPCB21B37/72
Inventor 白石利幸小川茂胁坂岳显
Owner NIPPON STEEL CORP