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J
Jeroen1-Visitor
1-Visitor
February 13, 2013
Question

Sheetmetal file corrupted?

  • February 13, 2013
  • 1 reply
  • 2291 views

I have a sheet metal part that used to unbend without problems.

A few days later, I have the same file without changes made to it, and it doesn't unbend anymore.

I get the error message " innapropriate edge selected " if I try to unbend it again.

I tried many things, including deleting some of the latest features, and creating the sheet metal part again. Nothing works.

Recreating the whole part from scratch again will be very much work, because it is completely parameter/relation driven.

At the same time as the first part, I created a second part witch has the first part inside it (merge/inheritance) , and has the unbend feature already created. This part still unbends, even when I delete the unbend feature, and add the unbend feature again.

If I try to recreate this file in the exact same way (new file --> merge/inheritance --> create driving surface) it works up until the unbend feature. This will now also fail with the same message (innapropriate edge).

My computer/creo might have crashed between when it used to work and now, I don't remember.

Is there a way to resolve this kind of problems? ( let creo or a tool check for problems inside the file?)

I looked everywhere inside the file, there is no message or hint anywhere that indicates anything wrong.


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1 reply

J
Jeroen1-VisitorAuthor
1-Visitor
February 13, 2013

UPDATE: After 3 hours searching, trying, getting angry and cursing everything on my desk I found something that looks like a solution, but if I may quote Mr. Spock: it's illogical.

SITUATION: I have a sheet metal part that has some intelligence included. It is a plate that follows the form of the surface it is placed on. The 'mother surface' can be a cylinder, a cone or an eccentric cone. In some cases, the unbending works like a charm, in most cases I cannot place the unbend feature because I cannot select a fixed geometry. Here I get the error "innapropriate edge".

SOLUTION: If I change the parameters to make the "mother surface" very easy, like a cylinder, I can create the unbend feature. I have to do this in a second part, with the merge/inheritance function because the main part must always be in the bent situation. Once created, I can change the parameters to whatever I want, the unbend feature will keep on working without a problem. Sizes and forms that previously failed, are now not a problem anymore.

REMARK: I think Creo has a bug somewhere in the unbend feature. In my opinion, the unbend has to possible in all cases, from the first time, not only with a detour...

INFO: the version I'm currently working with: Creo Parametric 2.0 M030

T
TomD.inPDX17-Peridot
17-Peridot
February 13, 2013

This must be your saddle challenge

When you created your eccentric cone, was it done in sheetmetal or did you convert it after the fact?

J
Jeroen1-VisitorAuthor
1-Visitor
February 18, 2013

Yes it is the saddle challenge... I'll be a saddle-master soon...

Because I don't know in advance the type of vessel the saddle is on (conical, eccentric cone, cylinder), I created the internal surface of the vessel with a blend. This is in my opinion the only way to create all 3 surfaces controlled with parameters and relations. (there are in reality some more parameters to take into account, like a slope and a shift of the axis for the eccentric cone, that I didn't mention because that will bring us too far).

This surface is offseted to create the outer surface of the vessel (this is also the inner surface of the saddle plate).

This final surface is trimmed to get the final form of the saddle plate. The trim definitions are depending on parameters and on other items of the saddle.

After this, the surface is thickened and converted to sheet metal.

Because of the option for an eccentric cone, it is not possible to create a sheetmetal part from the beginning.

But nevertheless, it is strange that I can alter all parameters and dimensions without any problems, IF the unbend feature is already there. And if I want to unbend the part AFTER I played with the parameters, the unbend is not possible anymore...

saddle.jpg

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