Full round between three surface

[tatarchukov]

How I can create in UG full round between 3 surface ? It possible? Now i use for this I-DEAS v11(three surface fillet feature) or CATIA v13 (threetangent filet feature).

 

[ewh]

What version of NX?

 

[Xwheelguy]

This works up to NX2, but I'm not sure if it's changed in any newer versions of NX. You have to apply the radius one half at a time. You will need to have a curve or edge that is exactly on or sketched or projected to the middle of the surface that will "disappear" when the full radius is applied. Then you will want to select Face Blend and set the Radius Method to Tangency Controlled. Select the faces just like you would for a normal Face Blend. After that, click the far right icon at the top of the Face Blend dialog (Tangency Control) and then select the curve or edge. After that, set your Trim & Attach options and apply the blend if it succeeds. Repeat for the opposite side. When finished, you will have a 3 faced blend. The key is to get the Tangent Control line or edge in the correct place.

Keep in mind, the steps may have changed for NX3 or beyond.

Tim Flater
Senior Designer
Enkei America, Inc.

http://www.enkei.com

 

[tatarchukov]

I use this metod (two step with face blend feature ) with v15. But this not work with complex surfaces. The first problem - design correct midsurface (or curve on middle surface). The second problem - face blend consist two surface connected betwen by tangent (NOT CURVATURE). This not good work for design blades fan for aviation engine. May be in NX 4 this problem solve?
P.S. Sorry my bad english

 

[Xwheelguy]

Nope, it's still not available. Been griping to them for almost 10 years now.

If you want a curvature continous 3 surface blend, then use associative bridge curves or associative splines to build the wireframe of the blend, then make a through curve mesh free form feature or use Shape Studio's Studio Surface.

As far as I know, I don't believe either of the blends you listed above in your first post have curvature capabilities, do they? If so, then why is one called tri-tangent?

Tim Flater
Senior Designer
Enkei America, Inc.

http://www.enkei.com

 

[cbrn]

Hi,

1- the problem of drawing the correct midsurface-parting curve may be solved by using an isoparametric curve with u (or v) equal to 0.5.

2- I'm used with hydraulic turbomachinery, so maybe this problem affects only flow of compressible fluids, but in our field the LE curvature continuity is never a "must": are you absolutely sure that a D2 discontinuity would affect LE performance, as far as D0 and D1 continuities are guaranteed?

3- Anyway, for this particular task I would prefer the method described by nkwheelguy: much more control, and it allows LE shapes different from the single-radius round (ex: parabolic, ogival, etc...)

Regards

 

[tatarchukov]

But PROE, CATIA, I-DEAS (and Solid Works !!!!) have this feature (fillet with 3 surfaces )! Now I use ug v17 and nx3.