Aluminum alloy scratches, scratches, and bruises are surface damage caused when aluminum profiles flow out of die holes and come into contact with tools, equipment, etc. in subsequent processes. There are mainly the following reasons:
1. The profile is artificially dragged on the swing bed to cause scratches;
2. During the transportation process, the profiles are rubbed or squeezed to cause damage;
3. There are sundries in the mold cavity or the working belt, and the hardness of the mold working belt is low, so that the surface of the working belt is injured during extrusion and scratches the profile;
4. There is bare metal on the discharge track or swing bed or there are hard inclusions in the graphite strip, which will scratch the surface of the profile when it comes into contact with the profile;
5. When the fork bar sends the profile from the discharge track to the swing bed, the profile is bruised due to excessive speed.
Common solutions:
1. Strengthen the control over the quality of ingots;
2. Arrange the profiles reasonably in the material frame and try to avoid mutual friction;
3. Improve the quality of mold repair, regularly nitriding the mold and strictly implementing the nitriding process;
4. Handle with care during production, and try to avoid random dragging or flipping of profiles;
5. Use soft felt to isolate the profile from the auxiliary device to minimize the contact damage between the profile and the auxiliary device.
Solution provided by HWALU