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pshepherdson12-Amethyst
12-Amethyst
July 28, 2014
Solved

Closing a gap - default sheetmetal bend radius opening

  • July 28, 2014
  • 5 replies
  • 8723 views

Hi All,

can't figure this out..

I have a sheet metal tub, and the welder is complaining. I don't blame him, I am too!

I have a tub, with 4 folded up sides. The bend radius is nice & big, 1/4" radius, for cleanliness & wipe down regulations. But, since this is a bend radius, Creo applies the default bend calc to it, and I get a great opening where the two flanges radius to their vertical, upright positions. I need to add a chord flange, a little arc of material to the ends of the flange where radius is.

I can't seem to add a flange, then cut away want i don't want, because it cuts into the mating flange! I don't know how to add a bit to this flange, and a bit to the other flange, withough cuttting into each other. (I seem to have to 'unbend' then add a flange, then cut away the squareness, to leave my 'chord' portion.. But that cuts into the other side, so i can only modify one side, while mutilating the other..) And the 'extend' don't work, cuse I'm grabbing the teh same face edge in Creo's eyes.. Or something. (Extend never worked for us in Creo 2, or is very tempremental.. bug?!)

Any ideas on how to close this off? (Without pulling the 2D flat pattern into Acad & doing it there?)

see attached for the gap / hole I'm trying to close

thanks,

Paul

Add this to the Sheet Metal gripes: not being able to draw a flange the shape you want without first having to establish a 'basic' flange first & cuttting it from that..


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Best answer by dgschaefer

Add your large corner radii prior to the shell and then, also prior to the shell, add a round to the edge where the joint would be that's 2X 1X the wall thickness. Nowm,after the shell use a surface rip to remove the 1X radius round surfaces.

5 replies

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dgschaefer21-Topaz IIAnswer
21-Topaz II
July 28, 2014

Add your large corner radii prior to the shell and then, also prior to the shell, add a round to the edge where the joint would be that's 2X 1X the wall thickness. Nowm,after the shell use a surface rip to remove the 1X radius round surfaces.

T
TomD.inPDX17-Peridot
17-Peridot
July 28, 2014

You are on the right track, Paul. You do want the flange, but you want to add the flange to both edges (or all 4). This will create the v-notch you are wanting.

open_bend_relief.PNG

You can even add some overlap if your welder wants additional material (edge treatment).

open_bend_relief_overlap.PNG

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pshepherdson12-AmethystAuthor
12-Amethyst
July 29, 2014

Thanks guys,

But..

Doug, doing so, or as i understand it, removes the 2*mat thickness radius previously added [adding a surface rip]. Therefore, my edges don't meet, and the gap, although smaller is still there. Then, I have the added difficulty of trying to get my vertical edges to meet, as per normal. I can extend the edges, but I cannot extend less than the bend radii: 1/4" in this case. I can, however, extend both edges the 1/4" min Creo allows, but then I have two intersecting flanges..

Now, if I do a surface rip, and remove one entire side (bend & flange) I get want I want, but on one flange, and now I need to make a new flange to match... I can add a new flange, but it gives the standard, straight 'V' edge, and the opening is one sided, and still can't be closed... (See pic at bottom: left edge as I want, the right edge per Creo)

Antonius, that is what I'm getting, but i still have that huge opening that needs to be welded closed. I'm not after a 'V' notch with straight sides, but more of a curvy 'V' notch; each straight side of the 'V' should be a curve...

And my vertical edges should be as per normal, each inside edge mating, as per the original pic attached..

The welder wants to just run a bead , a filet, on the two mating edges, not plug a 1/8" opening..

flat intent.jpg

this pic show one edge of my flat, as i expect my notch to look like. but to do two, mating flanges like this...

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pshepherdson12-AmethystAuthor
12-Amethyst
July 29, 2014

Doung, you got it!!

You mentined 2x material thickness, that leaves a gap. But, dogin 1x material thinkness seesm to be it!!

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dgschaefer21-Topaz II
21-Topaz II
July 29, 2014

Sorry about that, I meant 1X. I corrected my post above for clarity. 😛

Glad I could help. Please mark the correct answer, it'll help folks in the future.

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pshepherdson12-AmethystAuthor
12-Amethyst
July 31, 2014

Yeah, that's what burned me. The start of my part was a flat plate. I had to redraw the whole part, starting with a solid. Once that was rebuilt, I then had to re-assembled it all back into the assemblies I had. lost 2 days in total..

T
TomD.inPDX17-Peridot
17-Peridot
July 31, 2014

But! ... how many mouse clicks did you save?

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pshepherdson12-AmethystAuthor
12-Amethyst
August 1, 2014

haha, saving mouse clicks... At least i had drawings to work from!!

Actaully, the number of mouse clicks dosen't (really) get to me, it's the @#$%^ constant use of the middle button all the time!! I remeber having 3 button on my mouse back in .. '94? 95?, but since 2001, the middle button has traditionally been a wheel, with little expected 'clicking' use! scrolling yes, clicking no. Why does PTC hold onto this?!

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