COLD ROLLING METHOD FOR DECREASING EDGE DROP

摘要

PURPOSE:To obtain a good sheet thickness profile with decreased edge drops in >=3 stands of cold tandem rolling by tapering both or one ends of the work rolls of rolling rolls of the 1st and 2nd stages from the inlet side thereof. CONSTITUTION:The work rolls tapered at both or one ends are incorporated into the rolling rolls of at least the 1st and 2nd stages from the inlet side of >=3 stands of the cold tandem rolling rolls. More specifically, each of the work rolls has an initial crown in the central part and has the convergent tapers consisting of the rotating surface having part of a sine curve or the curve approximate thereto from the position inner by the distance of 10-20 times the thickness of the base sheet to the inside of the width of the strip at both ends. Such work rolls are incorporated vertically symmetrically into the rolling mill. The work rolls having such taper on one side are incorporated vertically point symmetrically into the mill. The drafts in the 1st and 2nd stages are set at about 15-35%, by which the edge drops are decreased to about one-third the edge drops of the conventional material.