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Aluminum foil rolling

Views: 1     Author: Site Editor     Publish Time: 2022-06-24      Origin: Site

Aluminum foil rolling

Particularity of aluminum foil rolling

In the production of double foil, the rolling of aluminum foil is divided into three processes: rough rolling, medium rolling and finish rolling. From the perspective of process, it can be roughly divided from the thickness of the rolled outlet. The general division method is that the rough rolling is when the outlet thickness is greater than or equal to 0.05mm, the medium rolling is when the outlet thickness is between 0.013 ~ 0.05, and the finish rolling is when the outlet thickness is less than 0.013mm for single sheet finished products and double rolled finished products. Rough rolling is similar to the rolling characteristics of aluminum plate and strip. The thickness control mainly depends on rolling force and post tension. The thickness of rough rolling processing rate is very small. Its rolling characteristics are completely different from the rolling of aluminum plate and strip. It has the particularity of aluminum foil rolling. Its characteristics mainly include the following aspects:

(1) Aluminum strip rolling. The thinning of aluminum strip mainly depends on the rolling force. Therefore, the automatic control mode of plate thickness takes the constant roll gap as the main control mode of AGC. Even if the rolling force changes, the roll gap can be adjusted at any time to maintain a certain value, and the strip with the same thickness can be obtained. When aluminum foil is rolled to medium finish rolling, because the thickness of aluminum foil is very thin, it is easier to increase the rolling force to make the roll produce elastic deformation than the rolled material produce plastic deformation. The elastic flattening of the roll cannot be ignored. The elastic flattening of the roll determines that the rolling force has not played the same role as the rolled plate in aluminum foil rolling. Aluminum foil rolling is generally non roll gap rolling under constant pressure, Adjusting the thickness of aluminum foil mainly depends on the adjusted tension and rolling speed.

(2) Lap rolling. For the extremely thin aluminum foil with a thickness less than 0.012mm (the thickness is related to the buy medical aluminum foil - YuanfarAluminumdiameter of the work roll), it is very difficult to use the single sheet rolling method due to the elastic flattening of the roll. Therefore, the double rolling method is adopted, that is, adding lubricating oil between the two aluminum foils, and then rolling together (also known as stacking rolling). Stacking rolling can not only produce 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 produce 0.006mm ~ 0.03mm single-sided smooth aluminum foil in batch.

(3) Velocity effect. In the process of aluminum foil rolling, the phenomenon that the thickness of foil becomes thinner with the increase of rolling schedule is called speed effect. The explanation of the mechanism of velocity effect needs to be further studied. The reasons for the velocity effect are generally considered as follows:

1) The friction state between the work roll and the rolled material changes. With the increase of rolling speed, the amount of lubricating oil increases, so that the lubrication state between the roll and the rolled material changes. As the friction coefficient decreases, the oil film becomes thicker and the thickness of aluminum foil becomes thinner.

2) Change of rolling mill itself. For rolling mills with cylindrical bearings, with the increase of rolling speed, the roll neck will float in the bearing, so that the two interacting loaded rolls will move closer to each other.

3) The material is softened during rolling deformation. The rolling speed of the high-speed aluminum foil mill is very high. With the increase of the rolling speed, the temperature in the rolling deformation zone increases. According to the calculation, the metal temperature in the deformation zone can rise to 200 ℃, which is equivalent to an intermediate recovery annealing, thus causing the processing softening of the rolled materials.

Principles for formulating aluminum foil rolling process

① Determination of the total processing rate the total processing rate refers to the total deformation degree of the foil from recrystallization annealing to rolling out the finished product. Generally speaking, the total processing rate of series 1 can reach more than 99%, and some series 8 products can reach this value, but the total processing rate of aluminum alloy foil is generally below 90%.

② Determination of pass processing rate determination of pass processing rate is the core of rolling process. For pure aluminum series products, the pass processing rate can reach 65%. For the first pass after billet annealing, excessive processing rate should not be used, generally about 50%.

Rolling thickness

The thickness measurement methods of aluminum foil rolling mainly include eddy current thickness measurement, isotope ray thickness measurement and X-ray thickness measurement. X-ray thickness measurement is the most common method used in aluminum foil production, especially in high-speed aluminum foil rolling mill. Thickness control methods for aluminum foil rolling: rolling force control, tension control, rolling speed control, tension / speed, speed / tension control.

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