Main cause of surface damage of aluminum profile
① The ingot surface is attached with debris or ingot composition segregation. When there are a large number of segregation surfaces on the ingot surface and 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 the extrusion process, these segregation surfaces or hard metal particles are attached to the working belt surface or cause damage to the working belt, and finally cause scratches to the profile surface;
(2) There are sundries in the mold cavity or working belt, and the hardness of the mold working belt is low, so that the surface of the working belt is injured when extrusion and scratched profiles;
③ There are hard inclusions in bare metal or graphite strips on the discharge track or swing bed, which cause scratches on the surface of profiles when they contact with profiles;
(4) When the fork bar sends the profile from the discharge track to the swing bed, the profile is hurt because of the too fast speed;
⑤ Scratches caused by artificially dragging profiles on the swing bed;
In the process of transportation between the profiles friction or extrusion caused by damage
solution
① Strengthen the quality control of ingot;
(2) Improve the quality of mold repair, mold regular nitriding and strictly implement the nitriding process;
(3) Use soft felt to isolate the profile from the auxiliary tools to minimize the contact damage between the profile and the auxiliary tools;
(4) Production should be handled lightly, as far as possible to avoid dragging or turning profiles;
⑤ Reasonable placement of profiles in the material frame to avoid mutual friction as far as possible.
