surfacing problem of bonnet vent

[SiW979]

we have a body panel which is many years old and only consists of unparameterized solids and features. One of our users has been tasked with adding 2 extra vents to the panel slightly smaller than the others, in fact if you unblank everything, you can see the rough outline and also my attempt at modelling one. Now my effort (top vent) looks OK (if your blind and happen to be galloping past on a horse), but it was a very rough attempt and I know that there will be better methods/tools to use other than the ones I have that I probably can't visualize how to use, so if your a surfacing ace (unlike me), then please could you perhaps give me some pointers.

Many thanks in advance.

Best regards

Simon NX4.0.4.2 MP10 - TCEng 9.1.3.6.c - (NX6.0.3.6 MP2 native)

http://www.jcb.com

Life shouldn't be measured by the number of breaths you take, but by the number of times when it's taken away...

 

[JohnRBaker]

I can't open the file in either NX 4.0 or NX 6.0.

John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Industry Sector
Cypress, CA

http://www.siemens.com/plm

http://www.plmworld.org/museum/

To an Engineer, the glass is twice as big as it needs to be.

 

[SiW979]

John

It won't let me attatch the file even compressed down to 4.6 MB is there another way to compress it further?

Best regards

Simon NX4.0.4.2 MP10 - TCEng 9.1.3.6.c - (NX6.0.3.6 MP2 native)

http://www.jcb.com

Life shouldn't be measured by the number of breaths you take, but by the number of times when it's taken away...

 

[SiW979]

Here is a parasolid of the part, however, you won't be able to see the features that I have used to create the top vent.

Best regards

Simon NX4.0.4.2 MP10 - TCEng 9.1.3.6.c - (NX6.0.3.6 MP2 native)

http://www.jcb.com

Life shouldn't be measured by the number of breaths you take, but by the number of times when it's taken away...

 

[hudson888]

What is it that you want? Design advice or how to do something specific. I'm presuming that this is a sheet metal outer panel, and that you're able to provide the draw line and approximate position of the addition slots, and some criteria for their length and width. Personally I'd change the shape a little to improve appearance and the underlying surface isn't giving you a lot of help through that corner but it can be done.

One thing I would be careful about are minimum bend radii for forming. I know that top slot probably looks better with a 4mm radius, but all the others have at least 6mm. While at the same time you're forming the metal more sharply at the top due to the increased angle of incidence between slot die draw and surface, so I think you may run into some formability problems if this part is to be made the way that I think it is.

Best Regards

Hudson

www.jamb.com.au

Nil Desperandum illegitimi non carborundum

 

[SiW979]

Hudson

It is made from plastic, not metal. I was looking for tips on different tools in NX. I'm struggling to get to grips with styled blend, bloody thing is so T
temperamental, also I used an extrude for the little inner flange where I should have perhaps used silhouette flange but it wasn't allowing me to.

Best regards

Simon NX4.0.4.2 MP10 - TCEng 9.1.3.6.c - (NX6.0.3.6 MP2 native)

http://www.jcb.com

Life shouldn't be measured by the number of breaths you take, but by the number of times when it's taken away...

 

[JohnRBaker]

Simon,

If you have a webkey ID, go to the GTAC site and upload the part file to the 'scratch' area and I'll download it from there.

John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Industry Sector
Cypress, CA

http://www.siemens.com/plm

http://www.plmworld.org/museum/

To an Engineer, the glass is twice as big as it needs to be.

 

[hudson888]

Simon,

After interrogating the model I can guarantee you that you don't need to bother with styled blends for the job. Why because you're colleagues who made the lower blends below have used pure radii. It would seem like overkill at this late date to be caught up in the effort to use a different tool. However it did fool me for that very reason! I would expect plastic to have led in blends rather than radii, a 6mm radius is a typical minimum for forming sheet metal.

If you just want to learn about styled blends that I'll offer some comments. I don't like that they don't produce discrete faces when crossing surface boundaries. I would prefer to see separate faces with good mapping of the internals spanning between the opposite curves. However whenever you build from curves on surfaces in NX there is extra work to be done. It is often the case that a better bend highlight is achieved when the shape can be "led in" by setting back the tangent from the apex of the corner. This is what the styled blend does either by calculating an offset itself or using curves that you have provided. I'm inclined to create a construction surface first in order to quickly establish the offset and then after extracting the curves carefully rebuild the individual faces. This is usually done along the long sides first and the corners are usually put in last, often with an extra control method to tweak the highlight mid corner.

Best Regards

Hudson

www.jamb.com.au

Nil Desperandum illegitimi non carborundum

 

[mmauldin]

How about a retro dragster scoop?

 

[hudson888]

Needs a set of chromed pipes to suit! Probably better suited to one of these tractor pull versions.



Best Regards

Hudson

www.jamb.com.au

Nil Desperandum illegitimi non carborundum

 

[almakuch]

I could try to attempt to model something to the parameter-stripped model if you can send me the prt file