[China Aluminum Network] Bubbles or peeling: Convex bubbles appear on the surface of the product, which are commonly found in the head and tail. Completely called bubbles, cracked skin is called leather.
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First, the extrusion product bubble, from the skin causes 1. Extruded cylinder, extrusion pad wear is poor, extrusion cylinder and squeeze pad size is not properly matched, the use of gasket diameter difference exceeds the allowable value;
2. The squeeze tube and the pressing pad are too dirty, with oil, moisture, graphite, etc.;
3. Lubricating oil contains water;
4. There are too many troughs on the surface of the ingot, too deep, or there are pores, blisters on the surface of the ingot, loose structure, oil stains, etc.;
5. When replacing the alloy, the inside of the barrel is not clean;
6. Extrusion barrel temperature and extrusion ingot temperature are too high;
7. Ingot temperature, size exceeds allowable negative deviation;
8. The ingot is too long, the filling is too fast, the temperature of the ingot is uneven, and the non-drum filling is caused, so the exhaust in the cylinder is incomplete, or the operation is not proper, and the exhaust process is not performed;
9. The design of the die hole is unreasonable, or the residual material is improperly cut. The residue in the diverging hole and the diversion hole is partially taken out, and the gas in the void enters the surface during the extrusion.
Second, eliminate methods 1. Reasonably design the size of the extrusion cylinder and the extrusion gasket, often check the size of the tool to ensure compliance with the requirements, extrusion tubules must be promptly repaired belly, extrusion pad can not be poor;
2. Tools, ingot surface kept clean, smooth and dry;
3. When replacing the alloy, thoroughly clean the cylinder;
4. Check the equipment and equipment frequently to prevent overheating and excessive speed;
5. Strictly implement the process regulations and various systems;
6. Reasonably design and manufacture tooling, diverting holes and diverting holes are designed to be inclined within 1°-3°;
7. Strict operation, correct cutting of the residual material and complete exhaust.
