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Warped aluminum plate
865 1 Sep 20.2019, 17:08:32

I know this is not a mechanical forum, but seems like there are quite a few machinists here, so I will just post it here.
I've just ordered a few 7075T6 plates from McMaster, and so far the thick plates turned out fine.
However, one thin plate, a 0.09" plate, came pretty badly warped to a point that it won't sit flat without external force.
So my questions:
1. How should I elastically plastically flatten it (I need to machine it, then it will be the lid of a machined enclosure, I don't want it to warp in front of my customer)?
2. On the plate, it says "ALCLAD 7075-T6 AMS 4049 KAIS", so it's an aluminum clad, right? Then what could be the core it clads onto?
3. I take the "KAIS" as Kaiser, if that's true, should I blacklist Kaiser (sounds stupid though considering its prevalence in US of A)?
Thanks for your input.

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A****min

Sep 21.2019, 10:58:37

Unless you are buying precision flat stock some curl can be expected in most sheet stock. Unless it is specified for flatness you are more or less on your own.

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