What should I do if the surface of the extruded aluminum profile is blistered and skinned?

Convex bubbles appear on the surface of extruded aluminum profiles or aluminum profile products, which are common at the head and tail. The complete ones are called bubbles, and the broken ones are called skin. 1. Reasons for bubbles and peeling of extruded aluminum products: 　　1. Extrusion cylinder and squeeze pad are worn out, the squeeze cylinder and squeeze pad are not properly matched, and the diameter difference of the gasket used exceeds the allowable value; 　　2 , Extrusion cylinder and extrusion pad are too dirty, sticky with oil, moisture and graphite, etc.; 　　3, the lubricant contains water; 　　4, the surface of the ingot has too many shovel grooves, too deep or there are pores, sand holes, and structure on the surface of the ingot Loose and oily, etc.; 　　5. The inside of the cylinder was not cleaned up when changing the alloy; 　　6, the temperature of the extrusion barrel and the temperature of the extruded ingot were too high; 　　7, the temperature of the ingot, the size exceeded the allowable negative deviation; , Filling is too fast, the temperature of the ingot is uneven, causing non-drum filling, so the exhaust in the cylinder is not complete, or the operation is improper, and the exhaust process is not performed; 　　 9. The die hole design is unreasonable, or the residual material is improperly cut, and the flow is divided The residual material in the hole and the guide hole is partly taken out, and the gas in the gap enters the surface during extrusion. 2. Elimination method 1. Reasonably design the matching size of the extrusion cylinder and the extrusion gasket, and check the tool size frequently to ensure that it meets the requirements. If the extrusion cylinder has a big belly, it should be repaired in time, and the extrusion pad should not be out of tolerance; Keep the surface of the ingot clean, smooth and dry; 　　3. When changing the alloy, thoroughly clean the barrel; 　　4. Check equipment and instruments frequently to prevent excessive temperature and speed; 　　5. Strictly implement process regulations and various systems; 　　6, Reasonably design and manufacture tools and molds, and design the diversion holes and diversion holes with an internal slope of 1°-3°; 　　7. Strict operation, correct cutting of residual materials and complete exhaust.
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