Strategy for Weight Reduction of Aluminium Plate

PM2.5 · Oct 1, 2020

What is a good strategy for weight reduction of an aluminium plate, 25mm thick x 750mm dia.
Have to make the plate shown in the image lighter and I believe machining diamond shapes out of it is a good way forward. Could anyone point me in the right direction for good engineering practices?
It's sitting on a Weiss indexer and doesn't have much weight on top of it.

mhajicek · Oct 1, 2020

https://www.atg-europe.com/wp-conte...of-mass-and-cost-efficient-grid-stiffened.pdf

Mike1974 · Oct 1, 2020

You could machine any shape you want into/out of the plate. Don't think it much matters, but I would put a generous corner radius in any holes/slots etc to reduce stress risers (if that would matter for your application).

Milland · Oct 1, 2020

Consider warpage if that matters, with many aluminum sheets, rolling stresses can remain such that cutting large amounts of material from one side (even with a grid remaining) can still allow the plate to warp. If you don't need a flat surface on one side, balanced pockets cut in both sides will minimize this risk, at the cost of extra setup and machining.

Finegrain · Oct 1, 2020

Whatever shape you settle on, please, for pity's sake, do not design it with small (1-2mm) radius corners. That adds greatly to the machining cost for marginal additional weight savings.

Regards.

Mike

vmipacman · Oct 2, 2020

I think triangles are the most efficient. Circular holes aren’t. IMO

D Nelson · Oct 3, 2020

ISO Grid

Sent from my iPhone using Tapatalk Pro

Rick Finsta · Oct 7, 2020

Yup, ISO Grid.

Still gotta watch for flatness/warpage.

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Strategy for Weight Reduction of Aluminium Plate

PM2.5

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