Control system of tandem cold rolling mill
AssigneeToshiba Mitsubishi-Electric Industrial Systems Corporation
InventorTomoyuki Tezuka
Life of this patent
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Abstract
In thickness control processing, transfer processing of an entry thickness He(N) is performed (step S1). In the transfer processing, data of the entry thickness He(N) is transferred from a position P11 to a position P12 at the same speed as the speed of a material to be rolled M. Subsequently, an amount of change in a thickness ΔH(N) is calculated (step S2). The amount of the change in the thickness ΔH(N) is calculated based on data of a delivery thickness Hd(N) and data of a transferred thickness Hc(N) transferred to the position P12 at a timing when the data of the delivery thickness Hd(N) is measured. Then, a target entry thickness He(N)_tgt is calculated (step S3). Subsequently, a manipulated amount of rolling speed VR(N−2) and VR(N−k) are calculated (step S4).
Claims8
A control system of a tandem cold rolling mill comprising at least three or more stands in which a light reduction rolling is performed in a final stand of the at least three or more stands, comprising:
- an entry thickness gauge configured to measure an entry thickness indicating a thickness of a material to be rolled in an entry side of the final stand;
- a delivery thickness gauge configured to measure a delivery thickness indicating a thickness in a delivery side of the final stand;
- and
- a control device configured to execute thickness control of the material to be rolled by the at least three or more stands,
- wherein, in the thickness control, the control device is configured to:
- based on entry speed indicating speed of the material to be rolled in the entry side of the final stand and delivery speed indicating the speed in the delivery side of the final stand, transfer the measured data of the entry thickness from an installation location of the entry thickness gauge to the installation location of the delivery thickness gauge at the same speed as speed of the material to be rolled;
- based on the measured data of the delivery thickness and transfer data indicating the measured data of the entry thickness that is transferred to the installation location of the delivery thickness gauge at a timing when the said measured data of the delivery thickness is measured, calculate an amount of change in a thickness in the final stand;
- based on the amount of change in the thickness and a target delivery thickness indicating a target value of the thickness in the delivery side of the final stand, calculate a target entry thickness indicating a target value of the thickness in the entry side of the final stand;
- and
- calculate a manipulated amount of the rolling speed of a stand located two or more stands upstream of the final stand such that the measured data of the entry thickness coincides with the target entry thickness.
Dependencies are inferred from the claim text.