cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Showing results for 
Search instead for 
Did you mean: 

Community Tip - You can Bookmark boards, posts or articles that you'd like to access again easily! X

Sweep with 2 trajectories

wfalco
15-Moonstone

Sweep with 2 trajectories

All,

 

I am looking to recreate a part in Creo from another CAD tool. I don't use sweeps too much. I would like 1 sketch to sweep around - end points connected respectively to 2 trajectories. The sketch is basically 2 radii with a wall thickness being swept around. It is a plastic part.

 

What is the best tool for doing this? Swept Blend? Blend? Other?

 

Thanks,

 

WayneF

 

Screenshot 2022-10-07 104014.png

Screenshot 2022-10-07 105155.png

1 ACCEPTED SOLUTION

Accepted Solutions
wfalco
15-Moonstone
(To:wfalco)

Screenshot 2022-10-13 080917.png

 

What I tried and it worked fine was to create 2 cross sections and one path section to create a boundary blend in the corners. I mirrored to all corners, joined all with extruded surfaces, thickened to solid and added perimeter lip and cuts. I then was able to do what my original intent was - created a surface from the inside surface, close it, merge and finally solidify.

 

I got the idea of using the boundary blend from a few users here in the community. Thank you!

View solution in original post

13 REPLIES 13
tbraxton
21-Topaz II
(To:wfalco)

There are multiple ways to do this. It depends on your modeling workflow. Are you using surfaces to make the cavity surface or building the solid from the start? Your workflow will determine which tools are appropriate.

 

The obvious option is a sweep with multiple trajectories from your description but looking at your pictures would guide me to use rounds in the corners of the geometry shown rather than sweep around them. You can see isoparm lines in your images that are indicative of suboptimal modeling. 

 

These isoparms should probably not exist in t model and should be avoided.

tbraxton_0-1665155394422.png

 

========================================
Involute Development, LLC
Consulting Engineers
Specialists in Creo Parametric
wfalco
15-Moonstone
(To:tbraxton)

TB

 

I am not sure what the best method is. I guess I was going to go with solid from the start?

 

The sweep you mention is a simple sweep? Can multiple trajectories be used? Not a blend or swept blend? I did use simple sweep first but it did not come out right. You may have triggered an idea though, in mentioning using radii? 

 

I do agree about the suboptimal modeling. This is one reason I am redoing this.

 

Much thanks. I will follow up.

 

Wayne

tbraxton
21-Topaz II
(To:wfalco)

Creo 7 model enclosed for reference.

 

I would use the master model merge method for this product to develop the outer surfaces in the master first. 

 

For a molded part I would model the cavity surface first and then offset it to get the core side. You can solidify using merge features once the cavity and core quilts are built.. The one caveat is to check that you can offset the cavity geometry to the thickness needed as you go along.

 

This is a simple approach to make a shape very close to your reference. I think your sweep trajectories may complicate this (in the corners), but the approach is still valid. I have simplified the trajectories relative to your images, but you can mimic this method to get what you need.

 

If you can deviate from the reference model to correct suboptimal geometry it will be pretty straightforward. If you cannot deviate, then you will need to do something additional in the corners.

 

Two sweeps (constant section two trajectories) and a boundary blend for the corner with C1 continuity across boundaries.

tbraxton_0-1665157875105.png

 

========================================
Involute Development, LLC
Consulting Engineers
Specialists in Creo Parametric
tbraxton
21-Topaz II
(To:wfalco)

This is what the corners should look like when it is built using best practices with C1 continuity on all 4 boundaries of the corner.

 

tbraxton_1-1665159073197.png

 

========================================
Involute Development, LLC
Consulting Engineers
Specialists in Creo Parametric
wfalco
15-Moonstone
(To:tbraxton)

Thanks! Very nice. Sadly I am on 6.0. 

 

The only reason I am even rebuilding the model is that I wanted to copy the inside surfaces and cap off so I can simulate potting material for thermal analysis use. But those surfaces are not working in the quilt. I am able to merge all my surfaces but am unable to solidify. It is due to the suboptimal geometry I am pretty sure.

tbraxton
21-Topaz II
(To:wfalco)

Can you post the model you need to use to create the potting volume? If so, someone may be able to extract a useable quilt from that model. What format is the reference model available in?

========================================
Involute Development, LLC
Consulting Engineers
Specialists in Creo Parametric
wfalco
15-Moonstone
(To:tbraxton)

The file is in Creo 6.0. It was imported. I have attached a zip.

tbraxton
21-Topaz II
(To:wfalco)

Is the potted volume only filling the negative space of the shell as seen here? This is a solid as if you poured it into the shell when it is level. You may run into meshing issues with this as there are some anomalies in the geometry.

tbraxton_0-1665167263982.png

 

========================================
Involute Development, LLC
Consulting Engineers
Specialists in Creo Parametric
wfalco
15-Moonstone
(To:tbraxton)

Yes. Nice! I will take a look.

wfalco
15-Moonstone
(To:tbraxton)

Sorry, been away for a bit.

 

Just what I needed! I removed a small sliver that I did not need. But the surface is the main thing. Thank you so much!

 

Now....it don't think this technically resolves the original post, but it gets me to where I need to be.

kdirth
20-Turquoise
(To:wfalco)

I only have 7.0, so here is a screen shot of my tree and result.  No need for sweep.

kdirth_0-1665168127565.png

  • Sketched perimeter
  • fill for top
  • extrude surface for sides up to perimeter side end point
  • mirror
  • extrude and mirror ends
  • Project sketch to trim sides and ends
  • tangent boundary blends for corner and mirror
  • merge

There is always more to learn in Creo.
wfalco
15-Moonstone
(To:kdirth)

hmmmmm. cool. Thank you. I will see what I can do.

wfalco
15-Moonstone
(To:wfalco)

Screenshot 2022-10-13 080917.png

 

What I tried and it worked fine was to create 2 cross sections and one path section to create a boundary blend in the corners. I mirrored to all corners, joined all with extruded surfaces, thickened to solid and added perimeter lip and cuts. I then was able to do what my original intent was - created a surface from the inside surface, close it, merge and finally solidify.

 

I got the idea of using the boundary blend from a few users here in the community. Thank you!

Top Tags