Creation of Compound Radii Fillet
Creation of Compound Radii Fillet
(OP)
I am currently in the process of modeling an unshrouded axial wheel airfoil to be used for die creation. The customer requires a compound fillet between the hub of the wheel and the airfoil.
The larger of the radii must have its center located at a set distance from the 'platform' or inner flowpath of the part, and it is to be tangent to the airfoil. The smaller of the radii is then blended with the larger at the flowpath.
I've been able to recreate this profile in sketch mode, but I have been unable to use this profile to create the fillet I need.
Below is the profile I would like to use for my blend.
Any help would be greatly appreciated. Thank you.
http://fi les.engine ering.com/ getfile.as px?folder= f9b870be-9 901-4fbb-b 7a5-986184 abaecb& ;file=UG_H elp.JPG986 184abaecb& amp;file=U G_Help.JPG
The larger of the radii must have its center located at a set distance from the 'platform' or inner flowpath of the part, and it is to be tangent to the airfoil. The smaller of the radii is then blended with the larger at the flowpath.
I've been able to recreate this profile in sketch mode, but I have been unable to use this profile to create the fillet I need.
Below is the profile I would like to use for my blend.
Any help would be greatly appreciated. Thank you.
http://fi





RE: Creation of Compound Radii Fillet
Tim Flater
Senior Designer
Enkei America, Inc.
www.enkei.com
Some people are like slinkies....they don't really have a purpose, but they still bring a smile to your face when you push them down the stairs.
RE: Creation of Compound Radii Fillet
--
Bill
RE: Creation of Compound Radii Fillet
The three fillet types I have available to me are: edge, face and soft. I'll go back to trying to use one of these to get the job done.
I also forgot to mention, I am running NX4.0 with only basic licensing.
RE: Creation of Compound Radii Fillet
Another option would be to create a "helper" surface to which a Face Blend with the most surface area (not the largest value) is tangent, do not Attach this Face Blend to the airfoil yet. Then create a second Face Blend tangent to the first Face Blend and the second surface of the airfoil, again only let the Face Blend Trim, not attach. Finally, Sew all the surfaces except the helper surface then use Patch and see if you can Patch the Face Blends into the solid airfoil.
Tim Flater
Senior Designer
Enkei America, Inc.
www.enkei.com
Some people are like slinkies....they don't really have a purpose, but they still bring a smile to your face when you push them down the stairs.
RE: Creation of Compound Radii Fillet
Thicken the hub (any reasonable value)
Unite the AF to the thicken
Blend with large fillet
Trim resuling body with original hub sheet
Unite body to wheel model
Instance the body with blend
Apply small blend using instance option
This also works with variable blends for either or both blends that comprise the compound.
Hope this helps
RE: Creation of Compound Radii Fillet
I am currently at the end of the process which you described TurbBldDsgnr, but unfortunately the small blend is now giving me issues due to the a small part of the geometry of the larger blend.
I'll let you know how this turns out.
RE: Creation of Compound Radii Fillet
Cheers
Hudson
RE: Creation of Compound Radii Fillet
Tim Flater
Senior Designer
Enkei America, Inc.
www.enkei.com
Some people are like slinkies....they don't really have a purpose, but they still bring a smile to your face when you push them down the stairs.
RE: Creation of Compound Radii Fillet
You might try a conic blend. The problem is that it is very near impossible to replicate the same results as the compound, but you can get close. I have used sheet blends and the patch method suggested by nkwheelguy. Main problem is discontinuities that can cause issues for analysis/Mfg CAM. An AF typically has a radial edge somewhere. If that occurs at the extreme LE or TE it can attribute to the blending problems due to a very complex set of vertex generated where the two face edges meet. You might try using the stop short blend option to end blend before problem area. You could then try various freeform methods to close the gap.
One more possibility is extract some V parameter curves on the AF face and sub-divide the AF face using them. At minimum, this may help you trouble shoot the blend issue. Isolate the LE and TE first.
RE: Creation of Compound Radii Fillet
Cheers
Hudson,
RE: Creation of Compound Radii Fillet
It's been a little hectic here lately, so I may not get back to this immediately.
[IMG]http
[IMG]http
RE: Creation of Compound Radii Fillet
To be honest your images aren't screaming at me what your problem is.
Cheers
Hudson
RE: Creation of Compound Radii Fillet
Tim Flater
Senior Designer
Enkei America, Inc.
www.enkei.com
Some people are like slinkies....they don't really have a purpose, but they still bring a smile to your face when you push them down the stairs.