Aluminum foil rolling is different from general strips, which is characterized by negative roll gap rolling. Generally, there is a certain amount of roll gap during strip rolling. When rolling aluminum foil, the two work rolls are completely pressed against each other, and the parts other than the foil are also in contact with each other. The rolling process depends on the elastic deformation of the work rolls, which are applied by the rack. The rolling force is greater than the deformation resistance of the metal, so the influence of the rolling force on the thickness of the foil is significantly reduced, and the rolling speed and uncoiling tension become the main means of thickness control. Usually, the work roll starts to press when the material thickness is 0.1～0.2mm. Because the aluminum foil is very thin, the mechanical properties are obviously reduced, and it is extremely sensitive to the uneven deformation of the cross section, and it is also very sensitive to the metallurgical quality of the material, and the belt is easily broken. At present, the general development trend of the global aluminum foil industry is to provide users with aluminum foil of higher quality, wider format, smaller thickness and safer. To
Basic composition
The aluminum foil rolling mill is mainly composed of several parts such as uncoiler, coiler, work stand, transmission system and auxiliary equipment. Among them, the working stand includes the frame, roll, roll bearing, rolling line adjustment device, etc. The auxiliary equipment includes coil feeding and unloading system, inlet and outlet device, sleeve conveying, process lubrication, oil mist lubrication, hydraulic and pneumatic system, Smoke exhaust system, CO2 fire extinguishing system, DC motor cooling, roll changing system, etc. The control system of the aluminum foil rolling mill is the key to aluminum foil production. A well-equipped aluminum foil rolling mill must be equipped with a perfect electric drive system, including a thickness control system and a flatness control system.
The size of aluminum foil rolling mills is usually divided according to the width of the roll surface. Those with a width less than or equal to 1200mm are called small rolling mills, those with a width of 1200mm to less than 1800mm are called medium rolling mills, and those with a width equal to or greater than 1800mm are called large or wide rolling mills. This article takes the 1800 rolling mill as an example to elaborate. The metallurgical quality and shape of high-speed cast-rolled strips are better than conventional cast-rolling methods, and rolling aluminum foil with them is one of the important development trends. High-speed rolling mill refers to a rolling mill with a speed equal to or greater than 1200m/min. The maximum rolling speed of the current roughing mill is 2500m/min. When selecting the rolling mill speed, the rough and intermediate rolling mills should not exceed 1800m/min, and the finishing mill should not exceed 1200m/min, or even 1000m/min.
