Part three: Layering, Aluminum extrusion defect analysis and quality control method

Part three: Layering, Aluminum extrusion defect analysis and quality control method

Layering, Aluminum extrusion defect analysis and quality control method

Layering causes and solutions

Layering

This is a skin layering defect formed by the inflow of ingot skin flowing into the product along the interface between the mold and the front end elastic region when the metal flow is relatively uniform.

On the lateral low-profile test piece, there is a defect that there is no layer at the edge portion of the cross section.

Main causes:

1. There is dust on the ingot surface or a large segregation aggregate of the ingot, without the skin removing and the metal tumor is easy to form a layering;

2. The mill finish has burrs or dirt, oil stains, chips and other dirt, not cleaned before extrusion;

3. The position of the die hole is unreasonable, close to the edge of the extrusion container;

4. The extrusion tool is seriously worn or there is dirt in the sleeve of the container, it is not clean and not replaced in time;

5. The diameter difference of the dummy block is too large;

6. The temperature of the extrusion container is much higher than the temperature of the ingot. 

Solutions for layering:

1. Design the mold reasonably and inspect and replace the unqualified tools in time;

2. Unqualified ingots are not used for the log heating furnace;

3. After cutting the residual material, it should be cleaned and not allowed to be with the lubricating oil;

4. Keep the lining of the extrusion container in good condition or clean the lining on time.

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