Part seven: adverse bonding defects, aluminum extrusion defect analysis and quality control method
Adverse bonding defects, aluminum extrusion defect analysis and quality control method
The phenomenon that the hollow product extruded by the porthole mold is delaminated or not fully bonded at the bonding joint is called adverse bonding defects.
Adverse bonding defects causes
1. The extrusion coefficient is small, the extrusion temperature is low and the extrusion speed is fast;
2. Extrusion billets or tools are not clean;
3. The extrusion mold with oil;
4. The mold design is improper, the hydrostatic pressure is not enough or uneven, and the design of the porthole is unreasonable;
5. There is oil on the billets surface
Solutions for adverse bonding defects
1. Appropriately increase the extrusion coefficient, adjust extrusion temperature and extrusion speed;
2. Reasonable design and manufacture for the molds;
3. The extrusion container and the dummy block should be not oiled and kept clean;
4. Billets with a clean surface.
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