Cause analysis of aluminum profile surface damage

1. Ingot surface attached with debris or ingot component segregation.Ingot surface existing number of segregation to content and ingot casting and homogenizing treatment or homogenization treatment effect is bad, the presence of a number of hard metal particles inside ingot casting, metal in the process of extrusion through the work zone, the segregation to objects or hard metal particles adhere to the work surface with or cause damage to work with, eventually cause scratch on the surface of a material;

(2) mold cavity or work with sundries, mold work with low hardness, so that the work with the surface of the extrusion injury and scratch aluminum profile;

(3) there are exposed metal or graphite strip on the discharge track or bed with hard inclusions, when it and profile contact to aluminum profile surface scratch;