Surface of Aluminum Profiles: Causes of Scratches, Abrasions, and Dings

1. Dross adhering to the ingot surface

2. The casting composition exhibits segregation, with a significant amount of segregates floating to the surface.

3. When ingots are not uniformly treated or the uniform treatment effect is poor, there are a certain number of hard metal particles within the ingots. During the extrusion process, as the metal flows through the working zone.

These segregated floatables or hard metal particles adhere to the workstrip surface or cause damage to it, resulting in scratches on the profile surface.

4. Debris on the mold cavity or work belt, lower hardness of the work belt, causing surface injury and scratching of the profile during extrusion.

5. There are exposed metal or graphite rods with harder inclusions on the feeding track or trolley. When they come into contact with the profile, they cause scratches on the surface of the profile.

6. The material was damaged upon impact due to the excessive speed of the fork rod transferring it from the discharge track to the staging bed.

7. Scratches caused by manual dragging of profiles on beds.

8. Damage occurs during transportation due to friction or pressure between the profiles.

Solution:

1. Strict control over the quality of ingot chemical composition.

Enhance the quality of mold repairs.

3. Enhance die-making precision and regularly nitride the dies, strictly adhering to the nitriding process parameters.

4. Use soft felt and plastic strips to isolate the profiles from accessories. Minimize contact damage between the profiles and accessories as much as possible.

5. Handle materials with care during production, avoiding unnecessary dragging or flipping.

6. Arrange the profiles in the material box logically to minimize friction between them.