In order to achieve the high productivity in a continuous tandem cold mill, the control system of forward slip ratio has been developed by the use of a supply device of rolling lubricant, which works in quick response to the lubricant flow and concentration.
In the calculation model of this control system, the method which modifies BLAND & FORD'S equation with a slide factor for calculation of friction coefficients is used to estimate negative values of forward slip ratio in addition to positive values. As for the supply device of rolling lubricant, emulsion stability and particle size distribution of lubricant obtained by a static mixer are equivalent to those by a convenient device. A high-speed and stable rolling without chattering can be realized by controlling the supply amount of rolling lubricant in the present control system of forward slip ratio.
