In the production of double foil, the rolling of aluminum foil is divided into roughing, rolling, finishing three processes, from the process point of view, can be roughly divided from the rolling exit thickness, the general division is the exit thickness greater than or equal to 0.05mm for roughing, the exit thickness of 0.013 ~ 0.05 for the middle of the rolled, the exit thickness of less than 0.013mm of the finished product of the single sheet and the finished product of the double combined rolled for the finished product of the finishing process. Rough rolling and aluminum sheet and strip rolling characteristics are similar, the thickness of the control mainly depends on the rolling force and post-tension, roughing processing rate thickness is very small, its rolling characteristics have been completely different from the rolling of aluminum sheet and strip, with the special characteristics of aluminum foil rolling, its characteristics are mainly the following aspects:
(1) aluminum sheet and strip rolling. To make aluminum sheet and strip thin mainly rely on the rolling force, so the automatic control of plate thickness is a constant roll gap for the main body of the AGC control mode, even if the rolling force changes, adjust the roll gap at any time so that the roll gap to maintain a certain value can also be obtained with a consistent thickness of the sheet and strip. The aluminum foil rolling to the fine rolling, due to the thickness of aluminum foil is very thin, rolling, increase the rolling force, so that the roll to produce elastic deformation than the material to be rolled to produce plastic deformation is easier, the elasticity of the roll flattening can not be ignored, the elasticity of the roll flattening decision of the roller in the rolling of aluminum foil, the rolling force has been less than the rolled sheet like the role of rolling aluminum foil rolling is generally in the constant pressure conditions of the roll without the roller seam, to adjust the thickness of the aluminum foil Mainly rely on adjusting the rear tension and rolling speed.
(2) Stacked rolling. For the thickness of less than 0.012mm (thickness size and the diameter of the work rolls) of very thin aluminum foil, due to the elasticity of the rolls flattened, with a single rolling method is very difficult, so the use of double rolling method, that is, the middle of the two foils plus lubricant, and then rolled together for the rolling method (also known as the stacked rolling). Stacked rolling can not only roll out a single rolling can not produce very thin aluminum foil, but also reduce the number of broken tape, improve labor productivity, the use of this process can be mass-produced 0.006mm ~ 0.03mm of single-sided light aluminum foil.
(3) Speed effect. Aluminum foil rolling process, the foil thickness with the rolling system of the phenomenon of thinning the gradient is called the speed effect. For the explanation of the mechanism of the speed effect has yet to be in-depth study, the reasons for the speed effect is generally believed to be the following three aspects:
(1), the work roll and rolling material friction between the state of change, with the increase in rolling speed, the amount of lubricating oil to increase the lubricating oil, so that the lubrication between the roll and rolling material changes. The coefficient of friction decreases, the oil film becomes thicker, and the thickness of the aluminum foil is then thinned.
(2), changes in the mill itself. The use of cylindrical bearings of the mill, with the rise in rolling speed, the roll neck will float in the bearings, thus making the two interacting with the loaded rolls will move in the direction of each other against each other.
(3), the material is rolled deformation when the processing of softening. High-speed aluminum foil rolling mill rolling speed is very high, with the increase in rolling speed, rolling deformation area of the temperature to open high, according to the calculation of the deformation area of the metal temperature can rise to 200 ℃, equivalent to an intermediate recovery annealing, thus causing the softening phenomenon of the rolled material processing.
