| 摘要 |
<p>PURPOSE: To control the temp. of a sheet to the target coiling temp. by small quantity of calculation with high accuracy even when sheet passing velocity is rapidly changed at the time of coiling a rolled sheet with a coiler. CONSTITUTION: In this method for controlling coiling temp. in hot rolling, at the time of making the rolled sheet to which finish rolling is applied in a hot rolling process enter cooling equipment and cooling it down to a prescribed coiling temp. by injecting cooling water on the rolled sheet, the injecting quantity (injection distance) of cooling water to every virtual sheared sheet which is set onto the rolled sheet is estimated based on measured temp. on the outlet side of a finishing mill and preset sheet passing speed and water is injected onto the virtual sheared sheet. The quantity of injection (completing position of water injection) 6 to the virtual sheared sheet whose sheet passing speed is linearly accelerating like the B is simply set to a value which is the quantity of water injection before acceleration multiplied by acceleration rate. Error 7 due to difference between the quantity 6 of water injection and the target quantity 5 of water injection is reduced in the inclination and magnitude, so the quantity of water injection for compensating the error is strictly calculated because a periodΔt which is calculated by allowable errorΔT is lengthened.</p> |
