Aluminum alloy scratches, abrasions, and dents are surface damages that occur when aluminum profiles flow out of the die hole and come into contact with tools, equipment, etc., in subsequent processes. The main causes are as follows:
1. Scratches caused by manually dragging the profiles on the lay-up bed;
2. Damage caused by friction or extrusion between profiles during transportation;
3. Foreign objects in the mold cavity or work belt, or low hardness of the mold work belt, causing the surface of the work belt to injure and scratch the profiles during extrusion;
4. Exposed metal or hard inclusions inside graphite strips on the discharge track or lay-up bed, causing scratches on the profile surface when in contact with the profiles;
5. When the fork rod transfers the profiles from the discharge track to the lay-up bed, collisions occur due to excessive speed.
Common solutions:
1. Strengthen the control of ingot casting quality;
2. Arrange profiles reasonably in the material frame, and try to avoid mutual friction;
3. Improve mold maintenance quality, regularly nitride the molds and strictly follow the nitriding process;
4. Handle carefully during production, and try to avoid dragging or flipping the profiles casually;
5. Use soft felt to isolate the profiles from auxiliary tools, minimizing contact damage between the profiles and the tools.
