In the production process of aluminum strips, quality problems are prone to occur due to equipment or personnel operating errors. The common quality problems in the aluminum industry are summarized as follows. I hope that the production department can pay attention to this problem.
Oil pollution is a common quality problem: oil pollution refers to the excessive oil on the surface of the aluminum tip after rolling. And there is excess oil other than the rolling oil film, which is visible to the naked eye during the process of slitting production and finished product inspection. With oil. These oils are mainly caused by throwing, splashing, dripping on the surface of the box at the roll neck or above and below the exit of the rolling mill, abnormalities in the roller cleaning device of the rolling mill, and oil dripping from the thickness measuring head of the rolling mill, and they are often dirty and complex.
This kind of oil pollution will bring greater harm to the surface of the aluminum coil:
First, because most of the finished aluminum coils are used as decoration or packaging materials, they must have a clean surface;
The second is that its thickness is thin, it is easy to form bubbles in the subsequent annealing, and because of the large amount of oil, too much residue is formed there, which affects the use.
The number of grease defects is a very important indicator for evaluating the quality of aluminum foil.
Solution:
Strictly inspect the production equipment before production. If there is too much oil in the equipment, clean it in time and find the cause. At the same time, clean the surface of the produced product. If the product that cannot be cleaned is scrapped, the product with oil is prohibited from entering the warehouse. And into the market.
Scratches are frequent visitors to quality problems: scratches, scrapes, and bruises are intermittent or continuous single groove-like scars on the surface of the aluminum sheet. Generally, it is produced when a sharp object slides relative to the surface of the foil after contacting it.
The main reasons:
There are sharp defects on the surface of rolls and guide rolls, or hard debris sticking to them;
The mechanical guide rollers and guide paths for shearing, winding, and slitting have sharp defects or sundries.
Scratch: Bundles (or groups) of scars distributed on the surface of the box material due to relative sliding or misalignment between the edges and surfaces, or the surface and the surface contact.