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J
JV_90872694-Participant
4-Participant
October 25, 2024
Solved

How to create a variable section sweep that follows trajectories

  • October 25, 2024
  • 1 reply
  • 1378 views

Creo: 10.0.0.0 education version

 

Hello everyone,

 

i am trying to create a sweep in the shape shown here:

sketches.PNG

I tried using the sweep blend feature but this results in weird interpolations between the segments. I know that by just sweeping from one section to another the interpolation is linear, but i want some sort of spline as shown in the sketches. Here is the image showing the interpolation.

sweep_blend.PNG

 

Using the blend feature to control the sketch with trajectories doesn't work properly. I do not know why the trajectories are ignored here, but when i change the sketch to an ellipse at leas one trajectory is followed.

sweep.PNG

sweep_ell_sketch.PNG

Maybe someone can help me with this, since i am out of ideas what parameters i need to change in these features to get my desired result.

 

 

Best answer by tbraxton

This will work using the core Creo surfacing features (I assume you do not have ISDX module). It is not the only way to do this but is what I would suggest based on your post.

 

You have a network of 3D curves available. Assuming they are all connected and have continuity required to support your surface build then I would recommend using 4-sided boundary blends to create one half of the shape and then mirror the surfaces (quilt). It looks like you can build six four sided boundary blend surfaces and then merge them to get one half of the desired shape. With boundary blends you will have control over the constraints (i.e. tangency) of the boundaries as long as the curves used to build it have connections of equal or higher continuity to the required surface connection across the boundary.

 

Make sure the curves are normal to the mirror plane so you will get tangency when mirroring.

 

If you need G2 or better connections, then you would be better served by using ISDX (style) features to create the curves and surfaces.

 

To Create a Boundary Blend

 

Create 6 4 sided "patches" as shown below and merge them together. Then mirror the quilt and merge. You then have the sides, create a fill surface on the top plane and then solidify the quilt. 

 

tbraxton_1-1729857796530.png

 

 

1 reply

tbraxton
22-Sapphire II
tbraxton22-Sapphire IIAnswer
22-Sapphire II
October 25, 2024

This will work using the core Creo surfacing features (I assume you do not have ISDX module). It is not the only way to do this but is what I would suggest based on your post.

 

You have a network of 3D curves available. Assuming they are all connected and have continuity required to support your surface build then I would recommend using 4-sided boundary blends to create one half of the shape and then mirror the surfaces (quilt). It looks like you can build six four sided boundary blend surfaces and then merge them to get one half of the desired shape. With boundary blends you will have control over the constraints (i.e. tangency) of the boundaries as long as the curves used to build it have connections of equal or higher continuity to the required surface connection across the boundary.

 

Make sure the curves are normal to the mirror plane so you will get tangency when mirroring.

 

If you need G2 or better connections, then you would be better served by using ISDX (style) features to create the curves and surfaces.

 

To Create a Boundary Blend

 

Create 6 4 sided "patches" as shown below and merge them together. Then mirror the quilt and merge. You then have the sides, create a fill surface on the top plane and then solidify the quilt. 

 

tbraxton_1-1729857796530.png

 

 

    J
    JV_90872694-ParticipantAuthor
    4-Participant
    October 25, 2024

    Thank you very much for this detailed response, after watching some quick tutorial on the boundary blend feature i was able to solve this problem as you described. It even worked without creating the6 surfaces separately. I needed to make sure that the trajectories intersect the wing profile sketches, otherwise the boundary blend feature wont work. After that i filled the top and bottom sketch with the surface fill tool and merged all three surfaces. Then i used the solidify tool so get a solid. Thank you very much 🙂

     

    solved.PNG

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