calculating required tonnage
calculating required tonnage
(OP)
Not sure if this is the right forum for this question...if there's a better place, let me know.
For an aluminum "Z" extrusion, how does one calculate the required tonnage for a cut-off,
given the shear strength of the alloy and the cross-section.
We are assuming the best method is to lay the "Z" to some angle to minimize the material thickness.
And yes, we'd be cutting off all at once, no side-shear.
For an aluminum "Z" extrusion, how does one calculate the required tonnage for a cut-off,
given the shear strength of the alloy and the cross-section.
We are assuming the best method is to lay the "Z" to some angle to minimize the material thickness.
And yes, we'd be cutting off all at once, no side-shear.





RE: calculating required tonnage
RE: calculating required tonnage
This sounds like a question for the Manufacturing and Plant Engineering forum.
Can you shear an aluminium extrusion? Aluminium extrusions tend to be made from heat treated, brittle material.
If you are preparing to spend a couple of hundred thousand dollars on a new machine and process, you should contact a consultant who actually works on this stuff.
RE: calculating required tonnage
rb1957, yes, that is what we're attempting to do....what are the terms in Fsu*A ?
drawoh, yes, aluminum extrusions can be sheared if the net shape is either completely surrounded with a minumum clearance, say .010 per side or less depending on the consistancy of the product dimensions/squareness....OR a suitable pressure pad that is very close to the profile is provided as the shear die cuts the extrusion off. In either case, the shear die should be the near same profile as the part. I envision this being done with a wire-EDM and having an lead-in opening that is tapered to allow easier part entry.
Quantities involved should justify tooling costs.
per your suggestion, I'll repost this to the Manufacturing and Plant Engineering forum.
RE: calculating required tonnage
Ted
RE: calculating required tonnage
BTW, how does one start a new thread and make reference to an old one ?
RE: calculating required tonnage
RE: calculating required tonnage
to get a clean cut you'd need to support the lower faces (something like a W shape) and the "blade" should contact all the upper faces at the same time (something like a M shape).
RE: calculating required tonnage
You can copy/paste the thread ID at the top of the page, the forum software will translate it accordingly:
(thread 404-236506 without the space after the d in thread.)
thread404-236506: calculating required tonnage
Just ask people to post replies here
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RE: calculating required tonnage
Imagine a border .010 (for example) around the outside of the profile,...that would be the die opening and, the opening that will be in the "punch" as well.....maybe I didn't elaborate enough, but that's what I was trying to explain in the response to drawoh.
Years ago, we made some cut-off dies for pre-formed stainless steel material that was used for the tops of display cases and some were dies that made miter cut at the same time. The approach to the problem of distortion was similar to what we'd like to do with aluminum parts. The thing we didn't get into was how to figure tonnage for a cross-section. The cut-off for the SS parts was for a die built for someone else to run in their facility, so they were the ones doing the sizing of the die set and press tonnage.
Thanks again to all.
RE: calculating required tonnage
Go to this page: htt
They have a Tonnage Calculator Online. It looks like you'd need a 25 tons press for your job.
Good luck!
Tudor Agapescu
www.argusengineering.net
RE: calculating required tonnage
Keith Cress
kcress - http://www.flaminsystems.com