Features of cold rolling techniques

(1)Different levels of processing hardening during rolling;

(2)Necessary cooling technique and lubrication;

(3)Tension rolling leading to rolling transformation.

The advantages of cold rolling strips

(1)Precise specifications and uniform thickness

(2)Obtaining the ultrathin material (≤0．001mm)

(3)Excellent surface quality, no pitting, ferric scales and other defects existed in hot rolled coils;

(4)Good mechanical properties;

(5)High-speed rolling and tandem rolling, high production rate.

Basic requirements on lubrication of cold rolling process

(1)Appropriate oiliness;

(2)Excellent cooling effect;

(3)Easy to be washed and cleaned;

(4)Stable physicochemical property;

(5)Good annealing property;

(6)Excellent anti-rusting property;

(7)No harmful;

(8)Low cost, broad oil resources.

Factors affecting rolling forces

(1)Uneven chemical composition and structures of steel;

(2)Effect of rolling speed variation on CR coils thickness

(3)Thermal expansion of rollers, abrasion of rollers, eccentric operation of rollers;

(4)Variation of tension strength, rolling speed and friction coefficient.