Causes and solutions of surface damage of aluminum shell

Reasons for surface damage of aluminum shell:

① There are impurities or segregation on the surface of ingot. When there are a lot of segregation floating objects on the surface of the ingot, but the ingot is not homogenized or the homogenization effect is not good, there are a certain number of hard metal particles in the ingot. When the metal flows through the working belt during extrusion, these segregation floating objects or hard metal particles adhere to the surface of the working belt or cause damage to the working belt, and finally cause Scratch on the surface of the profile;

② There are impurities in the mold cavity or the working belt, and the hardness of the die working belt is low, so that the surface of the working belt is injured and the profile is scratched during extrusion;

③ There are bare metal or graphite strip on the discharge track or swing bed, and there are hard inclusions in it, which will scratch the profile surface when it contacts with the profile;

④ When the fork bar transfers the profile from the discharge track to the swing bed, the profile is damaged due to the high speed;

Solution to surface damage of aluminum shell:

① Strengthen the quality control of ingot;

② Improve the quality of die repair, regular nitriding and strictly implement the nitriding process;

③ The soft felt is used to isolate the profile from the assistive device to minimize the contact damage between the profile and the accessory;

④ In production, handle with care and avoid dragging or turning the profile at will.