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Control method for preventing center mark in skin pass mill of continuous annealing line
Control method for preventing center mark in skin pass mill of continuous annealing line
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机译：连续退火线光整机防止中心痕的控制方法
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摘要
PURPOSE: A method for interlockingly feedback controlling workpiece threading speed and roll force when increasing or decreasing speed or during low speed operation in temper rolling process to prevent center mark generated by welding part and material defects formed by yield strength increase of front and rear parts of workpiece is provided. CONSTITUTION: The control method is characterized in that a business computer(21) provides workpiece information such as workpiece steel type, thickness and target elongation, a supervisory control computer(25) calculates roll force according to the workpiece information provided from the business computer(21) and entry side speed of skin pass mill inputted after being sensed and measured at pulse generator(22) attached to the entry side of skin pass mill, proper roll force values are calculated in realtime and inputted into roll force controller(27) to prevent center mark and prevent material defect of front and rear parts of the workpiece when the entry side speed of the skin pass mill measured by the supervisory control computer(25) is feedback inputted, and a hydraulic cylinder(28) for screw down is controlled by the roll force controller(27) according to the inputted proper roll force values so that the inputted proper roll force values are applied to lower back up rolls of the skin pass mill.
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