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G
GT20141-Visitor
1-Visitor
February 14, 2014
Question

Incorrect Flat pattern output when using flange in sheetmetal

  • February 14, 2014
  • 2 replies
  • 4001 views

Hi all new to the Forum hope you can help me with this problem

i have for years used the the flange command in sheet metal to create sheet metal mitred flanges.

I have always just sent the flat patterns to the fabricator as dxf file and let them deal with the profiles of the flatpatterns in most cases proe/creo will add relief to the flanges which will curve the profile and for years this was ok but now the fabricator wants all relief to be straight on the mitre flanges i cant for the life of me get creo to give me an output without curves on the mitres

Any help on this would really be appreciated please see attached pics and file which will explain exactly what i am looking for

Thanks in Advance G


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2 replies

L
LndoVnBtchmrk12-Amethyst
12-Amethyst
February 18, 2014

I tried to figure this out within the flange feature, but had no luck. I'm not sure how to acomplish what you're looking for other than unbending the part and cutting out those curved mitres. It's not an elegant solution, but it works.

T
TomD.inPDX17-Peridot
17-Peridot
February 19, 2014

Welcome to the forum, Graham.

The "problem" is the gap definition. You have a zero gap on the side and the top and to do this right, it has to have the transition through that bend.

To do what you are asking for means you would have a small gap on the top flanges (the 45 miter) and no gap on the vertial edges.

So as Andrew said, "unbend" the part and miter the edge and then "bend back".

There might be more methods but from what I know today, it requires more than a single step.

miter_flange.PNG

G
GT20141-VisitorAuthor
1-Visitor
February 19, 2014

Guys thank you for the replies

I was really hoping that this was a simple box i havent ticked or a setting that i havent added. But unfortunatley unbending and cutting the mitre out and then bending back looses all the time that i saved using the flange command in the first place.

Because this material ranges from 1-3mm the curves that creo create are only a hinderance to the fabricator who punches and laser cuts these parts so a requirement for the 0 bend allowance and straight edges is a must in manufacture time.

They K factor that is currently in use is 0.3 but the fabricator calculates the developed length and width by adding the inside bend dimensions.

the flange in the project is 50mm the inside lenght is 300mm and width 100mm

the bend dimensions on the flat pattern thus should measure the the same however they measure 100.71 and 50.36 respectivley, this leads me to belive that the incorrect flat pattern is used to achieve what the fabricator requires so i am going to change the k factor try and achive the correct bend dimensions i shall return to the forum later and let you guys know if this makes any differnce to flat result.

Again many thanks for your answers to this frustrating problem.

J
JamesBurcham1-Visitor
1-Visitor
February 19, 2014

You could also add a small flat portion to your flange. This doesn't help with the time portion of you problem, but would eliminate the curves when flat. As mentioned before, there isn't a quick 1-button way to eliminate this problem.

bend.png

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