NX 9 Part edges not aligned (Tried aligning facet edges)

[gopisandy]

HI Everyone,

This is my first post and I am new to NX. I am try to extrude a surface on a part and eventually export it to fluent.

I have attached the file and images of the part before and after the extrude.

The issue I have is that the edges are not aligned after I extrude. To be specific, I select no Boolean operation on the extrude.
But when I do unite the extrude with the part, the faces are aligned. But I need the extrude to be a different solid for analysis purposes.

I have tried preferences>visualization>align facet edges/refinement..etc. It is still not working.
It shows two different edges on fluent just like on NX 9. And the distance between the edges is zero on both !!

I use a parasolid of the model for fluent.

Any help/advise is appreciated.

Cheer and thanks!!

http://files.engineering.com/getfil...64-44ea-9cf2-6a89affc6101&file=no_extrude.jpg

http://files.engineering.com/getfil...4574-b1d4-3e57d2134dd4&file=extrude_unite.jpg

http://files.engineering.com/getfil...b641-af3b60995a2e&file=extrude_unite_zoom.jpg

http://files.engineering.com/getfil...-98ff-e218c6bf0a04&file=extrude_none_zoom.jpg

http://files.engineering.com/getfil...d-e1b3-4318-a86c-14331a035aaa&file=model1.prt

 

[jerry1423]

Open my NX file and see the way I did it.
By simply pulling the top face you will get what you need.

 

[gopisandy]

Hi Jerry,

Thanks for the advise. I can see it works but it is still part of the cone. Can I anyway make it a separate solid/entity? I had the same issue with extrude. With unite boolean I have similar result.

I would like to have the cone as 1st and the extrusion as 2nd solid.

Thanks!!

 

[cowski]

Extrude the "rib" solid so that it interferes with the cone; then use the "trim body" command to trim it back to the outer cone surface.

www.nxjournaling.com

 

[gopisandy]

Hey cowski,

I did try that before. It looks good as long as the rib and the cone are combined. As soon as I trim it, it becomes the same as before with the edges not aligned. This is pretty weird.

I have also tried revolving a thin surface over the original part. It just doesn't align.

Thanks

 

[cowski]

If you trim the rib to the cone surface, they will match perfectly (within modeling tolerance). Perhaps what you are seeing is just a display setting. Each part is faceted (for display purposes) individually; therefore the edge facets may not align, even though the actual part edges do.

www.nxjournaling.com

 

[gopisandy]

Even I think so. When I try to measure it, the distance between the edges is zero. Same thing in FLUENT. But it still considers them as separate edges.

But if that is the case, I dont know why it changes when i make it a part (unite) of the main solid. It looks better with aligned edges. I trying to understand why it chooses to do so visually in either case. why no do it always in the same way irrespective of the boolean operation.

 

[gopisandy]

Any suggestions ? I don't know if it just a visual rendering issue or something that I am doing wrong.

 

[cowski]

After zooming in, update the display (right click -> update display) and see if they align. If they do, it is just a display issue.

www.nxjournaling.com