Method of automatic width control of hot rolled strips
AssigneeHitachi, Ltd.
InventorsYasuo Morooka, Shinya Tanifuji
Life of this patent
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Abstract
This invention relates generically to an automatic strip width control method in a hot rolling mill. More specifically, the present invention relates to a method for controlling a strip width to a predetermined width in a rolling mill equipped with edging rolls which seeks the deviation of strip width by estimating the temperature of a roll material under the edging rolls and controls the roll gap of the edging mill by means of the deviation of strip width thus estimated in order to control the width of the strip to a predetermined level on the basis of the technical conception that there is a certain relation between the temperature of the roll material and the deviation of strip width.
Claims17
A method of automatic width control of hot rolled strip comprising guessing the temperature of a strip under edging rolls, adjusting the roll position of said edging rolls based on the relation between the strip temperature and the deviation of the strip width, and controlling the strip width to be a certain determined width.
A method of automatic width control of hot rolled strip equipped with edging rolls, wherein the strip temperature is detected by a strip temperature detector that is provided on the inlet side of said edging rolls, the strip temperature under the edging rolls is guessed by taking into consideration the time lag after which the point of measuring the strip temperature reaches the edging rolls as determined by the rolling speed, the deviation of strip width is found from a linear approximation that states a certain definite relation between the strip temperature and the deviation of the strip width, and the roll position of the edging rolls is adjusted responsive to said deviation of strip width to control the strip width to be a certain determined width.
Dependencies are inferred from the claim text.