Aluminum alloy scratches, scratches, and bruises are surface damage caused when aluminum profiles flow out of the die hole and come into contact with tools, equipment, etc. in the subsequent process. There are mainly the following reasons:
- Manually drag the profile on the swing bed to cause abrasions;
- The profiles are rubbed or squeezed to cause damage during transportation;
- There are debris on the mold cavity or working belt, and the hardness of the working belt of the mold is low, so that the surface of the working belt is injured during extrusion and the profile is scratched;
- There are bare metal or graphite strips on the discharge track or swing bed with hard inclusions, which will scratch the surface of the profile when it comes in contact with the profile;
- When the fork rod sends the profile from the discharge rail to the swing bed, the profile is injured due to the excessive speed.
Common solutions:
- Strengthen the control of the quality of ingots;
- Place the profiles reasonably in the material frame and try to avoid mutual friction;
- Improve the quality of mold repair, regularly nitriding the mold and strictly implement the nitriding process;
- Handle with care during production, try to avoid dragging or turning the profile at will;
- Use soft felt to isolate the profile from the auxiliary device to minimize the contact damage between the profile and the auxiliary device.
Link to this article：Causes and solutions of aluminum alloy scratches, scratches and bruises
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