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The most common ten quality defects of aluminum coil
Jan 19, 2019

The aluminum coil is a metal product for the flying shear after the casting mill has been subjected to calendering and drawing. Aluminum coils are widely used in electronics, packaging, construction, machinery, etc. There are many aluminum coil production enterprises in China, and the production process has caught up with developed countries. However, in the manufacture of aluminum coils, it is inevitable that some quality defects will be encountered. What are the common quality defects of aluminum coils?




1. Composite layer shedding: irregular defects formed by the aluminum-clad layer of the composite material leaving the substrate and falling off.


2, embossing: due to strip wrinkles, broken strips and other reasons caused by irregular chromatic aberration of the roll surface during the rolling process is printed on the surface of the strip chromatic aberration phenomenon.


3. Wave: The general term for various unevenness phenomena caused by uneven deformation of plates and strips. The waves generated by the plates and the edges are called the side waves, the waves generated in the middle are called the middle waves, and the waves between the middle and the sides that are neither in the middle nor on the sides are called two-ribbed waves, which are small in size and usually The circular waves are called broken waves.


4. Warping: After rolling or shearing, the edge of the strip is lifted.


5, side bending: the longitudinal side of the plate, the belt presents a non-flat state of bending to a side.


6, collapsed volume: the core is severely deformed, the shape of the roll is not round.


7. Mis-layer: Irregularly displaced between the end face layer and the layer, resulting in uneven end faces.


8. Tower shape: The belt layer and the layer are swayed to one side to form a tower-like offset.


9. Loose rolls: Looseness between layers and layers during coiling and unwinding, which affects the entire volume in severe cases.


10. Bird's nest: A local "V" type defect is produced on the end face of the coil. This defect is generated during or after unwinding of the coil, and some are generated after a certain period of time.