How To Quench Aluminium Extrusion Profile?
What is the definition of quenching in aluminium extrusion? Improve your understanding of this technique with this review of the process, including examples.
What Does it Mean to Quench Aluminium?
Quenching is a rapid way of bringing the extrusion profile back to room temperature after extruding to prevent the cooling process from dramatically changing the profile's microstructure.
How Is Quenching Executed?
Forced air convection and softened industrial water can be used to carry out the quenching process. Water is an effective medium when the goal is to have the profile to reach maximum hardness. However, using water can lead the profile to crack or become distorted. If extreme hardness isn't necessary, then other options such as high pressure spray, mist cooling, air-mist cooling or air cooling may be used in the quenching process instead.
The Impact of the Quench Rate
With a slower quench rate, the thermodynamic forces have more of an opportunity to change the microstructure. Sometimes, this outcome is preferred, which is why different mode are used to perform quenching. Air cooling, for example, has a quenching rate that's much lower than water cooling. Quenching in a liquid medium requires stirring the liquid around the piece of profile to reduce steam from the surface.
Pockets of steam counter the quench by air cooling until they evaporate.
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