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"Topology belongs to more than one bend" Error

12 REPLIES 12
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Message 1 of 13
sltyler
3267 Views, 12 Replies

"Topology belongs to more than one bend" Error

Hi all,

 

I'm getting an error when trying to flat pattern some sheet metal: !Definition1: Could not build this FlatPattern > !Topology belongs to more than one bend.

 

I created the part as a standard part, extruded it to 14 gauge mild steel thickness (0.0747") and I'm using a bend radius of 0.1"-- which corresponds to our press brake. Everything looks great, but when I convert to sheet metal and attempt to create a flat pattern, I get that error.

 

I should mention, I'm using Modify>Bend Part for my bends. Any help is appreciated!

I'll attach the part,

12 REPLIES 12
Message 2 of 13
chad38
in reply to: sltyler

Did you try using "fold" instead of bend part?

HP Z420 Workstation
Intel Xeon CPU E5-1603 0 @ 2.80 GHz 2.80 GHz
12.0 GB RAM
Windows 7 Professional 64 Bit
3D Connexion Space Pilot
Solid Edge ST9 MP1

Inventor Professional 2015
Autocad 2015
SolidWorks 2015
Message 3 of 13
sltyler
in reply to: chad38

I haven't used that operation before, but I will give it a go and report back. Thanks

Message 4 of 13
sltyler
in reply to: sltyler

Hmm, Inventor isn't allowing me to select the bend line. Any thoughts?
Message 5 of 13
sltyler
in reply to: sltyler

Ah, got it, the line didn't terminate at the face edges.
Message 6 of 13
chad38
in reply to: sltyler

Even still, if possible the best way to do this would be to model it as a formed sheet metal part and then flatten it.

 

I'm not sure why you need to flatten the part since you built it as an already flat part in the first place, couldn't you just use that flat you started with?

HP Z420 Workstation
Intel Xeon CPU E5-1603 0 @ 2.80 GHz 2.80 GHz
12.0 GB RAM
Windows 7 Professional 64 Bit
3D Connexion Space Pilot
Solid Edge ST9 MP1

Inventor Professional 2015
Autocad 2015
SolidWorks 2015
Message 7 of 13
sltyler
in reply to: chad38

The original sketch doesn't account for bend deduction, so I model it in Inventor and then export as a .dxf to get the proper flat pattern.
Message 8 of 13
chad38
in reply to: sltyler

Oh, well the "fold" command will fold the part, but your flat pattern will be the same size as what you put in.

HP Z420 Workstation
Intel Xeon CPU E5-1603 0 @ 2.80 GHz 2.80 GHz
12.0 GB RAM
Windows 7 Professional 64 Bit
3D Connexion Space Pilot
Solid Edge ST9 MP1

Inventor Professional 2015
Autocad 2015
SolidWorks 2015
Message 9 of 13
chad38
in reply to: sltyler

I edited the last 2 bends to get it to work.

HP Z420 Workstation
Intel Xeon CPU E5-1603 0 @ 2.80 GHz 2.80 GHz
12.0 GB RAM
Windows 7 Professional 64 Bit
3D Connexion Space Pilot
Solid Edge ST9 MP1

Inventor Professional 2015
Autocad 2015
SolidWorks 2015
Message 10 of 13
sltyler
in reply to: chad38

Interesting. It looks like the bend reliefs are coming out oval. in the flat pattern. Does that seem unusual? Thanks for all the help, by the way! I still have lots to learn with Inventor, so all of this information is valuable to me.
Message 11 of 13
JDMather
in reply to: sltyler


@sltyler wrote:
Interesting. It looks like the bend reliefs are coming out oval. in the flat pattern. Does that seem unusual?
...

You can set them to whatever (standard) shape you need, but I would start over on this part and model it as a folded sheet metal part.  I certainly wouldn't use Bend Part feature as that is not a sheet metal feature.


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Message 12 of 13
chad38
in reply to: sltyler

No, it seems right that the corner reliefs, which were originally drawn as circles, would elongate since it's then factoring the bend. BTW, the model I had sent before, though it flattened, it didn't have the same width as it used to. I made the reliefs wider in this one. That fixed the problem all the way.

 

Also, I agree with JDMather that you should model this as an already folded part and then flatten it.

HP Z420 Workstation
Intel Xeon CPU E5-1603 0 @ 2.80 GHz 2.80 GHz
12.0 GB RAM
Windows 7 Professional 64 Bit
3D Connexion Space Pilot
Solid Edge ST9 MP1

Inventor Professional 2015
Autocad 2015
SolidWorks 2015
Message 13 of 13
sltyler
in reply to: chad38

Alright, looks like I have some work ahead of me then. Thanks for the help guys.

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