Cold rolling of aluminum strip is usually carried out on a four-high or six-high mill. The cold rolling process of aluminum strip is generally divided into rough rolling, intermediate rolling and finishing rolling. Rough rolling and intermediate rolling focus on increasing pressure, strengthening the production process, and shortening the production cycle. The viscosity of the rolling oil is greater than the finishing time; the finishing focuses on ensuring the surface roughness and shape of the product. Cold-rolled aluminum sheets and strips require finished or intermediate annealing, and have higher requirements on product surface quality, shape and surface brightness. In addition, aluminum is also easy to stick to the roll during cold rolling, resulting in a decrease in the quality of the rolled surface. Therefore, the cold rolling oil for aluminum strip with good performance should meet the following requirements: ①The viscosity is moderate and the lubricating effect is appropriate. ②Narrow distillation range, high flash point and good safety. ③It has good cooling property, which can reduce the temperature of the roll and the rolling piece and control the shape of the plate. ④No corrosion to rolls and equipment. ⑤ Low sulfur, low aromatics, no oil stains on the surface of the strip after rolling and annealing. ⑥ Non-stick roll, easy to filter. ⑦Convenient maintenance and management. ⑧ Non-toxic, low odor, in line with environmental protection requirements.
(1) If it is a cold rolled or hot rolled product, usually the hot rolled product surface is brighter.
(2) Electron microscope analysis can not be seen, crystal image can see the difference.
(3) Visual inspection can roughly judge, the simple method is to test the elongation.
Cold rolled aluminum: Aluminum ingot – smelted – rolled into strip by casting mill.