Part thirteen: Orange peel, extrusion defect analysis and quality control method

Part thirteen: Orange peel, extrusion defect analysis and quality control method

Orange peel, extrusion defect analysis and quality control method

Orange peel is a certain kind of finish that may develop on painted and cast surfaces, even screen protectors. The texture resembles the surface of the skin of an orange, hence the name “Orange peel”   from Wikipedia

The surface of the extruded product has uneven wrinkles like orange peel, also known as surface wrinkles. It is caused by the coarse grains during the extrusion process. The coarser the grains, the more obvious the wrinkles.

In the straightening process of aluminum profiles, if the surface layer has the orange peel phenomenon, in fact, this is the surface metal cracks generated, as the stress on the surface metal of aluminum profiles is greater than the base metal, if the intensity is increased, even the base body will be directly broken.

The main causes of orange peel of aluminum extrusion

1. The billet structure is uneven and the homogenization treatment is not sufficient;

2. The extrusion conditions are unreasonable, and the grains of the finished product are coarse;

3. The work of stretching and straightening is overloaded;

4. Deformation in the extrusion process.

Solutions for orange peel of aluminum extrusion

1. Reasonably control the homogenization treatment process;

2. The extrusion shaping is as uniform as possible (control extrusion temperature, speed, etc.)

3. Control the straightening not overload;

4. Control the extrusion profiles straightness, strengthen repairing molds;

5. Equipped with the puller, avoid deformation in the extrusion process;

6. Control the stretch rate of the aluminum profile, in order to ensure the surface quality and straightness, and strictly control the bending during stretching;

7. Control the stretch rate of aluminum profile, in order to ensure the straightness and take into account the surface quality, cut stretching both ends and deformation parts more.

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