METHOD FOR COLD-ROLLING ELECTRICAL STEEL SHEET

PURPOSE:To execute cold-rolling to an electromagnetic steel sheet into profile having good cross section in the sheet by adjusting angle of tapered part at one side of working roll and overlapping length of the tapered part and sheet end part according to (Si+Al) content in the electrical steel sheet to be rolled. CONSTITUTION:At each one side of barrel part in the upper and lower working rolls 1a, 1b, the linear tapered part 2 is formed so as to be point symmetry between both rolls and both rolls are made shiftable in the arrow mark roll axes direction. By using this rolling mill, the cold-rolling is executed to the electrical steel sheet 3. In the above rolling method, the angle of the above tapered part 2 and the overlapping length of the tapered part 2 and sheet end part in the sheet width direction are adjusted according to (Si+Al) content in the above steel sheet 3 to be rolled. By this method, without developing breakage of the sheet, crack of the sheet end part, edge drop, etc., the electrical steel sheet 3 is rolled to obtain the profile of good cross section in the sheet.