Cold Rolling of Aluminum Alloy
Cold rolling is often carried out at room temperature. The aluminum alloy can be cold-rolled to obtain thinner sheets and strips with precise dimensions, smooth surface. It can also gained work hardened sheets and strips with specific mechanical properties. Cold rolling mainly uses a belt-type production process. This requires cold rolling using a four-roll reversing mill or a four-roller irreversible rolling mill. The rolling mill is equipped with a hydraulic pressure reduction, a hydraulic bending roll, an automatic thickness control system or an automatic thickness control system for measuring roll gaps and a shape control device. These micro-computers control, record, and store various parameters to obtain dimensionally accurate, flat-plate strips, such as 0.18 mm strip tolerances of ±5 microns.
Small factories also have block methods for producing plates. The cold deformation rate of aluminum after annealing can reach more than 90%. The multi-phase hard aluminum alloy is cold work hardened and requires intermediate annealing. The cold deformation rate after the intermediate annealing is 60 to 70%. Hot rolling is lubricated with an emulsion. Cold rolling has evolved from emulsions to full oil lubrication. A multi-stage cooling system with separate nozzles is used to reduce friction between the aluminum sheets and the rolls. Cool the rolls, control the roll type, remove aluminum powder and other impurities to obtain good surface quality and shape.