How to Control Aluminum Foil Roll Thickness

Aluminum foil rolling is a special and typical rolling technology. It is the process of aluminum foil rolling from the raw material to medium and fine rolling. Considering that the thickness of aluminum foil roll is relatively small, the rolling pressure needs to be increased accordingly to ensure that the roll can generate enough elastic deformation stress to cause plastic deformation of the rolled material during the rolling process.

The thickness difference of aluminum foil sheets refers to the thickness difference in the rolling direction and the thickness difference in the width direction of the aluminum foil, which is commonly known as the longitudinal thickness difference and the transverse thickness difference.

It is one of the important indicators of aluminum foil. Minimizing the aluminum foil thickness difference is a requirement for high-speed rolling of aluminum foil rolling mills. The size of the aluminum foil thickness difference directly reflects the rolling technology level, equipment level and control level of the aluminum foil manufacturers.

In order to control the thickness of the aluminum foil during the rolling process, the actual thickness of the aluminum foil during rolling must be measured accurately and quickly, and the thickness deviation can be controlled and corrected in a timely manner based on the measurement results to obtain the minimum thickness of the aluminum foil.

There are many factors that can cause deviations in the thickness of the product during the production process of aluminum foil, including: thickness deviation caused by the previous process, mechanical and hydraulic frame elasticity, roll eccentricity, thermal expansion and wear of the roll system, and roll bearing clearance. Other factors are calculation error, response time, reduction amount, deformation rate, work hardening, changes in rolling speed and tension,etc.

The final result of the above various influencing factors is that the rolling force changes during the rolling process, and the change in rolling force causes a change in the elastic deformation of the stand. Changes in the elastic deformation of the machine base directly affect the roll gap value, causing changes in the thickness of the rolled aluminum foil.

During the rolling process, if the roll gap can be adjusted in time so that the roll gap adjustment can partially or completely offset the elastic deformation of the stand caused by changes in rolling force, the thickness deviation of the rolled piece can be reduced or even completely eliminated.

Modern aluminum rolling mills are equipped with automatic thickness control systems. The principle is to control the equivalent stiffness of the rolling mill stand through a hydraulic pressure system to control the roll gap and ultimately control the thickness of the aluminum foil.

It is generally easy to associate the cause of abnormal thickness deviation with the thickness control system itself. In fact, the effectiveness of the thickness control system is not only related to itself, but also depends on the each system of the rolling mill like the thickness quality of the blank.

The thickness control of aluminum foil rolling mill is one of the most important control contents in the rolling mill production process. It is also a relatively complex control technology and involves various factors. In addition to ensuring the manufacturing and installation accuracy of the equipment and selecting high-level thickness control systems and X-ray thickness gauges, strengthening daily management to ensure the integrity of the equipment and the quality of incoming materials is crucial to ensuring the consistency and stability of thickness control.

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