For extremely thin aluminum foil with a thickness less than 0.012mm (the thickness is related to the diameter of the work roll), due to the elasticity of the roll, it is very difficult to roll it with a single sheet. Therefore, the double rolling method is used, that is, the The method of adding lubricating oil between two aluminum foils and then rolling them together (also called stack rolling). Laminated rolling can not only roll out extremely thin aluminum foil that cannot be produced by single rolling, but also reduce the number of strip breaks and improve labor productivity. This process can be used to mass produce single-sided aluminum foil of 0.006mm to 0.03mm.
During the aluminum foil rolling process, the phenomenon that the thickness of the foil becomes thinner with the increase of the rolling degree is called the speed effect. The explanation of the speed effect mechanism still needs in-depth research. The reasons for the speed effect are generally believed to have the following three aspects:
The friction state between the work roll and the rolling material changes. As the rolling speed increases, the amount of lubricating oil brought in increases, thus causing the lubrication state between the roll and the rolling material to change. The friction coefficient decreases, the oil film becomes thicker, and the thickness of the aluminum foil becomes thinner.
Changes in the rolling mill itself. In a rolling mill using cylindrical bearings, as the rolling speed increases, the roll neck will float in the bearing, so that the two interacting loaded rolls will move closer to each other.
