Friction during extrusion of Aluminum alloy

[XiangYan]

Can anyone provide information on the quality of extruded parts tolerance from 6061 and 6063 Aluminum alloy. I would like to have very tight tolerance on the dimension and have a choice of these 2 alloys, which one would be a preferred material ?

Is there any information on the viscosity of the Aluminum alloy under extrusion condition, basically in the re-crystallization temperature (but not melt). I guess the viscosity plays a role in determine how the material fills into the tight corners.

 

[Navin A S]

The extrusion process itself will determine the final tolerance of the parts. Generally, the tighter the tolerances, the more challenging it is to achieve them. 6061 and 6063 aluminum alloys both have excellent extrudability and should be able to meet most requirements for tight tolerances. 6063 is slightly easier to extrude, so it might be a better choice if tight tolerances are required. The viscosity of the alloys will play an important role in the performance of the extrusion process. Generally, the higher the viscosity, the more difficult it will be to fill tight corners and achieve tight tolerances. The viscosity of the alloys depends on the temperature of the material during the extrusion process. Generally, the higher the temperature, the lower the viscosity. However, the temperature should not exceed the recrystallization temperature or the material will begin to flow like a liquid instead of an extrudable solid.