[China Aluminum Industry Net] When the aluminum extrusion press pressurizes, it will leave air inside the aluminum profile, resulting in air bubbles inside and outside the aluminum profile, resulting in defects that cannot be completely resolved, making the aluminum profile a waste material. . In order to avoid air entering the aluminum profile, it is necessary to find out the reason why the air is brought in. The following author introduces the main factors of the air inside the four extruded aluminum profiles.
1. The long rod heat shear causes air residue. The shear plane formed when the rod is hot sheared is not perfect and vertical. Industrial aluminum profiles that are simply subjected to long bar heat shear can cause the bar to bend very much, resulting in an elliptical cross-section of the aluminum profile and a very large fillet being cut. Even with the newer long bar heat shear, the edge angle of the sheared bar is always rounded, and these roundings are a good place for air remnants.
2. Upsetting leads to air remnants. Only when the diameter of the cylinder containing the aluminum ingot is larger than the diameter of the cylinder, the cylinder can be put into the cylinder containing the aluminum ingot. After applying pressure to the rod inside the aluminum ingot, causing the rod to expand to the diameter of the ingot, the gas must be discharged. The gas is not discharged, but it will become bubbles later in the aluminum ingot.
3, due to the two aluminum rods connected to lead to air residues. Because the surface of the two short rods is essentially flat, the probability of carrying air is very small. The quality of sawing directly interferes with the amount of air carried between the two short rods. There is currently a high technology that prevents the two short rods from coming into contact with one another and eliminates the possibility of air ingress.
4. When extruding aluminum profiles, it is necessary to avoid the entry of air, so as to avoid the situation of residual air, and various defects occur in the post-processing.
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