METHOD FOR CONTROLLING SHEET TEMPERATURE

• Main Authors: HOSODA KOJI, UEDA ICHIRO, HONJO MOTOI
• Format: Patent
• Language: English
• Published: 09.07.1992
• Subjects: CHEMISTRY; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS

PURPOSE:To decrease off-target sheet temps. and to improve the yield and quality of products by changing a transporting speed by the difference between a determined furnace temp. set value and the furnace temp. set value during the passage of a preceding strip to redetermine the furnace temp. set value at the time of welding the different strips and subjecting the strips to continuous annealing. CONSTITUTION:The information on the respective specification of the different strips and the target strip temp. in the outlet of a heating furnace is first taken into an arithmetic controller at the time of welding these strips to connect the strips, passing the strips in the heating furnace and subjecting the strips to the continuous annealing. The speed table previously formed in accordance with the strip specification and the target sheet temp. is retrieved and the set value of the strip transporting speed in the central part of the heating furnace is determined. The furnace temp. set value is computed from this set value. The transporting speed of the strips is changed and the furnace temp. set value is redetermined when the difference between the computed furnace temp. set value and the furnace temp. set value during the passage of the preceding strip exceeds the prescribed value. The change rate of the set value of the furnace temp. is suppressed to a lower amt. and the response of the control is speeded up. The off-target strip temps. are thus decreased and the yield and quality of the products are improved.