METHOD OF CORRECTING WARPING OF TWO-LAYER CLAD METAL PLATE

摘要

PCT No. PCT/JP85/00658 Sec. 371 Date Jul. 2, 1986 Sec. 102(e) Date Jul. 2, 1986 PCT Filed Nov. 28, 1985 PCT Pub. No. WO86/03435 PCT Pub. Date Jun. 19, 1986.A method for preventing the camber of a two-layered clad metal sheet having a base layer and a covering layer of different metals which exhibit different amounts of thermal contraction. The method comprises developing a temperature difference DELTA T expressed by the following formula between the base layer and the covering layer during a hot levelling, by providing a greater cooling effect before or during levelling to the layer which exhibits the greater thermal contraction than to the layer which exhibits the smaller thermal contraction: DELTA T=f ( DELTA alpha , alpha , a, To) where, DELTA alpha : the difference in thermal expansion coefficient between both metals a: the clad ratio (ratio of covering layer thickness to total sheet thickness) To: hot leveller inlet temperature ( DEG C.) alpha : mean thermal expansion coefficient of both metals. Since the layer which exhibits a greater thermal contraction is forcibly cooled before or during a hot levelling adequately and by a required amount, the clad metal sheet does not exhibit any substantial camber after cooled down to the room temperature.