When the aluminum profile extrusion machine is pressurized, air will remain inside the aluminum profile, causing bubbles to appear inside and on the surface of the aluminum profile, resulting in defects that cannot be completely solved and turning the aluminum profile into waste. To avoid air entering the aluminum profile, it is important to identify the cause of the air being introduced. The following are the main factors that cause residual air inside the four extruded aluminum profiles.
1. The long rod hot shear caused residual air. The shear surface formed during the thermal shear of the column rod is absolutely not perfect or vertical. Simple long rod hot shearing of industrial aluminum profiles can cause severe bending of the column bars, resulting in elliptical cross sections and extremely large rounded corners at one end of the aluminum profile. Even with the latest type of long rod hot shear, the edge angle of the sheared column always produces chamfers, which are the best places for air residue.
2. Upsetting resulted in residual air. Only when the diameter of the cylinder containing aluminum ingots is larger than the diameter of the rod can the rod be placed inside the cylinder containing aluminum ingots. After applying pressure to the column inside the aluminum ingot cylinder, which causes the column to expand to the diameter of the ingot cylinder, the gas carried must be discharged. If the gas is not discharged, it will remain in the aluminum ingot and eventually become bubbles.
3. Due to the connection of two aluminum rods, air residue was caused. Because the surface of the two short rods is basically flat, the probability of carrying air in is very small. The quality of sawing directly affects the amount of air carried between two short rods. At present, there is a high-tech that can prevent two short rods from connecting and eliminate the possibility of air entering.
4. When extruding aluminum profiles, it is necessary to avoid the entry of air to avoid the occurrence of residual air, which can lead to various defects during post processing.
