When extruding aluminum profiles, air must be avoided to avoid the presence of residual air, resulting in various defects in the post-processing.
1. Improper oil application results in product bubbles.
Solution: apply oil correctly and use less oil. Strengthen the training of staff's pre-job operation technology;
2. The overpressure is too thin, which causes the metal in the shunt hole to be pulled out during shearing, leaving a gap in the shunt hole of the mold.
Solution: according to the tonnage of the extruder, set aside a reasonable residual thickness, according to the single weight of the profile, the number of raw materials and other process parameters to determine the reasonable length of aluminum rod;
3. Design the flat die welding room for the extrusion die, and the diverging die's diverging hole is too large, resulting in the bubble flowing into the cavity.
Solution: reduce the size of flat die welding chamber, and reduce the split die hole, more than 5MM from the single side of the extrusion barrel.