In the process of aluminum sheet and strip manufacturing, quality problems are prone to occur due to equipment or personnel operating errors. Here, the aluminum industry summarizes the common quality problems as follows. It is hoped that the manufacturing department will pay attention to this problem. Oil pollution is a common quality problem: oil pollution refers to the surface of the aluminum tip after rolling with too much oil, and with excess oil other than the rolling oil film, the surface visible to the naked eye during the process of slitting manufacturing and finished product inspection with oil. These oils are mainly caused by throwing, splashing, and dripping on the box surface at the roll neck or the top and bottom of the rolling mill outlet, abnormality of the roll cleaner of the rolling mill, and oil dripping from the thickness measuring head of the rolling mill, etc., and are often dirty and complicated. This kind of oil pollution will bring harm to the surface of the aluminum coil: firstly, because most of the finished aluminum coils are used as decoration or packaging materials, they must have a clean surface; secondly, their thickness is thin, and it is easy to form bubbles during subsequent annealing, and because of the oil If the amount is too large, too much residue will be formed there, which will affect the use. The number of oil defects is a very important indicator for evaluating the quality of aluminum foil.
Solution: Strictly check the manufacturing equipment before manufacturing. If you find that there is too much oil in the equipment, you should clean it in time and find the cause. At the same time, clean the surface of the manufactured products. If the products that cannot be cleaned are scrapped, the products with oil stains It is forbidden to enter the warehouse and enter the market.
Scratches are frequent customers of quality problems: scratches, abrasions, and bumps are intermittent or continuous, single groove-shaped scars on the surface of the aluminum plate. Generally, it is produced when the sharp object slides relative to the surface of the foil.
The main reason: there are defects on the surface of rolls and guide rollers, or mechanical guide rollers with hard debris for shearing, winding, and slitting, and the guide paths have defects or debris. Scratches: The scars distributed in bundles (or groups) on the surface of the box material due to the relative sliding or dislocation between the edges and the surfaces of the objects, or the contact between the surfaces and the surfaces.