Method of emulsion concentration optimization for cold continuous rolling mill set

A method of emulsion concentration optimization for a cold continuous rolling mill set, comprising the following steps:

• (a) acquiring apparatus characteristic parameters of a cold continuous rolling mill set;
• (b) acquiring critical rolling process parameters of a strip material;
• (c) acquiring process parameters involved in the process of emulsion concentration optimization;
• (d) setting an initial set value of an emulsion concentration comprehensive optimization target function for a cold continuous rolling mill set for achieving vibration suppression:
• F0=1.0×1010;
• the executing order of steps (a) to (d) is not limited;
• (e) calculating a bite angle α, of each stand;
• (f) calculating a vibration determination index reference value ξ0i of each stand;
• (g) setting an emulsion concentration Ci of each stand;
• (h) calculating the outlet temperature Ti of a strip steel of each stand;
• (i) calculating the dynamic viscosity η0i of an emulsion in a roll gap of each stand;
• (j) calculating an oil film thickness ξi in the roll gap of each stand;
• (k) calculating the emulsion concentration comprehensive optimization target function F(X);
• (l) determining whether the inequation F(X)<F0 is established, if yes, then setting Ciy=Ci, F0=F(X) and turning to step (m);
• if no, directly turning to step (m);
• (m) determining whether the emulsion concentration Ci exceeds the range of a feasible region, if yes, turning to step (n);
• if no, turning to step (g), wherein the feasible region refers to a region from 0 to the maximum emulsion concentration allowed by the cold continuous rolling mill set;
• (n) outputting the optimal emulsion concentration set value Ciy, wherein Ciy is the value of Ci when the calculated value of F(X) is minimum in the feasible region;
• and
• (o) adjusting and controlling the emulsion concentration of each stand according to the optimal emulsion concentration set value Ciy in the step (n) by a control system of the cold continuous rolling mill set;
• and
• in each formula, i represents the stand ordinal number of the cold continuous rolling mill set.