Patent ID: 8720244
Filing Date: 2014-05-13
Classification: B21B

Abstract:
1. A method of supplying lubrication oil for supplying an emulsion of a lubrication oil and heated water mixed together to an inlet side of a rolling stand in cold rolling of a metal sheet, comprising storing two or more types of lubrication oils of different compositions in separate tanks, wherein said two or more types of lubrication oils comprise one lubrication oil for mild steel and one lubrication oil for high tensile strength steel, selecting one of said stored lubrication oils in accordance with a friction coefficient between the rolled metal sheet and work rolls, and supplying an emulsion comprised of said selected lubrication oil and heated water mixed together to an inlet side of the rolling stand to achieve a target friction coefficient by a method comprising first adjusting a supply rate of said emulsion, and, if adjusting said supply rate is not sufficient, further adjusting a concentration of said emulsion.