| 摘要 |
<p>PURPOSE:To perform good and stable sheet thickness control over the total rolling speed range for rolling a steel strip by use of a rolling mill by performing proportional-plus-integral control in high speed rolling time and performing control by the Smith compensation method in low speed rolling time. CONSTITUTION:A proportional-plus-integral control circuit 14 and Smith compensation method control circuit 22 are installed in parallel to each other in a sheet thickness controller provided with a sheet thickness gage 12 as a sensor and a decision circuit 26 deciding that a roll peripheral speed signal V sent from a speed controller 24 whether exceeds or not a reference rolling speed V0 is also installed. When the circuit 26 decides that V>=V0, a switch circuit 28a is turned on by an output from the circuit 26 to perform proportional-plus- integral control by the circuit 14; when the circuit 26 decides that V<V0, a switch circuit 28 is turned on to perform the Smith method of control by the circuit 22.</p> |
