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CNC milling causes residual stresses in metals. So, after CNC milling of a metal part, say aluminium, do all manufacturers (I'm not referring to any specific manufacturer, just generally) heat treat such parts parts after milling?

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  • $\begingroup$ Thank you for trying to help me. I wanted to know whether aluminium parts are heat treated after CNC milling to a desired shape to relieve the part of residual stresses caused by milling. $\endgroup$ – Ron Oct 4 at 16:37
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    $\begingroup$ It is unusual to heat-treat any metal to remove machining stresses . It is common to heat-treat metals after machining for reasons other than removing machining stress. $\endgroup$ – blacksmith37 Oct 4 at 17:38
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    $\begingroup$ it is common to pre-anneal metal pieces before machining to release stresses locked into the microstructure during the initial forming processes. these stresses can be more significant than machining stresses. $\endgroup$ – niels nielsen Oct 4 at 19:21
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    $\begingroup$ The answer to your headline question is "No." What gave you the impression that it might "always" be the case? $\endgroup$ – Jonathan R Swift Oct 5 at 15:43

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