Sheet Metal Corner Treatments

[mmoooorree]

Using NX 9 Sheet Metal Application. The Closed Corner Tool list 6 different Corner Treatments.
Open/Closed/Circular Cutout/U Cutout/V Cutout/Rectangular Cutout. When would you use a particular Cutout and Why…?
Some corners look almost the same….
Haven’t been able to find any information.
Thank You

 

[JNieman]

Tooling considerations may sometimes dictate what geometry allows, if you're allowing use of standard COTS tooling in an NC punch press.

If you're not planning on welding the corner, you may want it as-closed as possible despite any minor tearing or stress on tooling.

If you're fully welding the unit, you may wish to minimize gap but still leave a minor amount.

If you don't care about the opening at all, and can leave as big of a gap as is practical... well you have several choices.

It's mostly design choices based upon manufacturing efficiency, material stress considerations, and forming tool wear/stress.

Maybe some other reasons that slip my mind.

 

[berkshire]

If you are designing for an in house fabrication facility, go down to the shop floor, and get hold of the sheet metal shop foreman. Ask to see what tools he has in stock, from his point of view, it will be better, if you draw to tools he already has.
Putting a corner cut that requires a tool he has to buy, especially for a short run job, will not win you any friends.
B.E.

You are judged not by what you know, but by what you can do.

 

[drawoh]

mmoooorree,

If your sheet metal part is mounted in an aircraft or on a moving vehicle, the punched out corners are stress raisers, and you need to worry about fatigue. You need to relieve the corners somehow. If you are designing a static box, you may want to close the corners down as much as possible. I interpret your table as a set of punched corner options. What do you need to accomplish?

--
JHG

 

[KENAT]

Different features have different drivers in different applications.

Sometimes stress concentration as drawoh mentions, sometimes manufacturability, sometimes aesthetics...

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
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