Re: [CAD_CAM_EDM_DRO] Re: sourcing motion control parts - steel vs aluminum

Stress relieving is an annealing process that normalizes a weldment. When materials are welded, heated to high temperatures unevenly they distort and contain stresses in different areas. This includes stamped and cold formed parts as well. Annealing involves placing the weldment in an oven and taking it up to temperature to allow the molecules to flow evenly then the part is cooled slowly allowing the molecules in the steel to properly align themselves evenly throughout the weldment therby alleviating all stresses produced by welding. It's the opposite of heat treating which carbon steels are taken to a specific temperatures depending on the rockwell desired and as the molecules flow the part is quenched in oil or water thereby abrubtly halting the flow of the molecules. Not allowing the molecules to re-align themselves and making the part brittle/hard. A note on stress relieving for general purpose welments: Don't waste your money.

Ron






Patrick J <patrick@...> wrote:

How do you stress relieve?

----- Original Message -----
> I have always purchased A513/A500 tubing and A36
> plate. Some of it comes in clean and arrow straight,
> some comes in dog legged and nasty. T-slot looks good
> on big budget projects, but is pretty pricey. The
> process I have been involved with for custom machines
> is;
> Cut pieced and weld up frame.
> Stress relieve.
> Grind flat.
> Then machine features.
> My experience is that even with the cost of stress
> relieving and grinding you will end up with a cheaper
> frame at 4' x 4' An added bonus is the frame will be
> heavier and as a result of the weight/mass be more
> stable than a lighter machine.
> Rob.


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