METHOD FOR CONTROLLING STRIP TENSION IN PROCESS LINE

• Main Authors: OKAMOTO AKIFUMI, OKA AKIYUKI, YONEYAMA HIDEYUKI, SUMIYA EIJI
• Format: Patent
• Language: English
• Published: 30.03.1988
• Subjects: AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL; CHEMISTRY; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING

PURPOSE:To stabilize the tension of a strip and to prevent the generation of flaws and rupture, by detecting the load currents of motors for driving rolls in a specific section and operating speed controllers for both the rolls by a speed commander at the time of conveying the metallic strip by many rolls. CONSTITUTION:The load currents I2, I3 of the motors 6-2, 6-3 for driving the rolls 2, 3 are detected by current detectors 7-2, 7-3 in order to control the tension T2 of the strip 5 between the rolls 2 and 3 to a prescribed value independently regardless of the front and rear tensions T1 and T3 at the time of conveying the metallic strip 5 in an arrow direction by the plural rolls 1-4 and subjecting the strip to an annealing or other heat treatment. The detected values are added by a current adder 10. The speed command values to be applied to the speed controllers 9-2, 9-3 of the rolls 2, 3 are simultaneously increased or decreased in the same amt. by the value obtd. after the added value is multiplied by a constant to determine the magnitude of a drooping characteristic, by which the tension of the strip is controlled independently only in the specific section. Since the tensions of the strip in the respective sections is not affected by the mechanical loss of the rolls, the generation of the flaws and rupture in the strip is obviated.