ã€China Aluminum Industry Network】formed a bubble profile on the surface of the profile; there was partial or continuous separation of the surface metal and the base metal of the profile. Appears as a round or partially continuous bulge.
the reason:
1, due to the size of the extrusion cylinder after long-term use. The gas in the barrel was not removed during extrusion. The surface of the deformed metal flows out along the elastic zone at the front end and causes air bubbles;
2. There is a groove in the surface of the ingot or there are pores in the ingot structure. The ingot is packed with gas when it is thick. The gas enters the metal surface during extrusion;
3. During the extrusion, the ingot or mold contains moisture and oil. Because water and oil are heated and evaporated into gas. In the high-temperature and high-pressure metal flow is formed on the surface of the coiled profile material gas;
4, the device exhaust device does not work properly; metal fill too fast, causing extrusion exhaust is not good
Solution:
1. Reasonably select and equip extrusion tools for timely inspection and replacement;
2. Strengthen the quality management of ingots. Strictly control the surface quality and gas content of the ingot;
3, ensure the normal operation of the equipment's exhaust system:
4, scissors, squeeze tube and mold should be as little as possible with or without oil;
5. Reasonably control the extrusion speed and exhaust as required.
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