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tbraxton
22-Sapphire II
tbraxton22-Sapphire II
22-Sapphire II
December 10, 2023
Question

Cellular array rib creation

  • December 10, 2023
  • 4 replies
  • 8135 views

Creo 7

I am looking for an automated way to create a cellular array of ribs and have run into what seems to be a limitation with trajectory rib functionality. The first pic below illustrates an example of what I want to create but I am not able to use the projection of the patterned hex curves in the sketch for a trajectory rib without manually selecting each hex.

 

I am able to generate a pattern of cells that "should" be available for use when defining a sketch for trajectory ribs. So far, I am not able to select the cell array with a pick box or intent reference selection. Am I missing something with sketcher selection or in the projection tool within sketcher?

 

Is there a better way to approach this from a modeling standpoint if I want it to be more automated? Using a fill pattern, I can generate the array from a single sketched hexagon and a few feature relations. It would be nice to leverage that and generate the ribs based on this pattern.

 

I need a way to select all of the cells using "all curves in feature" or similar when defining the sketch for the trajectory rib for this approach to work.

 

 

tbraxton_0-1702238180254.png

tbraxton_1-1702238389751.png

 

4 replies

M
16-Pearl
Michael16-Pearl
16-Pearl
December 10, 2023
You could do this with creo lattices. Requires AMX though. It does this and more.

tbraxton
22-Sapphire II
tbraxton22-Sapphire IIAuthor
22-Sapphire II
December 10, 2023

I have a superficial knowledge of AMX capability and while it may create the cells quickly, the ROI is not likely good for just this problem. Assuming the cells were created using AMX features, can those features be parametrically modified without an AMX license, e.g.  change the wall thickness of the cell?

 

 

I am looking for methods to automate this using core Creo modeling (without extensions other than advanced assembly). The parts in question run 10 million pcs/year and are not made with AM. The model in the first pic was built using a method not involving trajectory ribs and is "automated" but CPU resource intensive due to pattern regeneration times. We have methods of dealing with this limitation but are exploring alternatives.

tbraxton
22-Sapphire II
tbraxton22-Sapphire IIAuthor
22-Sapphire II
December 11, 2023

Creo 7 test case model for reference. I am trying to use the cell array to generate trajectory ribs in the shell.

 

tbraxton_0-1702299153170.png

 

A
aputman13-Aquamarine
13-Aquamarine
December 11, 2023

The way I would do this would be based on the method of patterning in this video.  It's a patterning of quilts versus features, which significantly reduces the regen time.  You will need a larger bottom "plate" to solidify against but that is easily removed after pattern is created. 

https://www.youtube.com/watch?v=6d2eIY6CLY4

aputman_0-1702308453111.png

 

 

A
aputman13-Aquamarine
13-Aquamarine
December 11, 2023

Most of the rounds can be added as well, using this method.  I would share the file back to you but I'm using CREO 8.

aputman_1-1702309461087.png

 

M
MartinHanak24-Ruby III
24-Ruby III
December 11, 2023

Hi,

I didn't think much, I just tried it. 

MartinHanak_0-1702316233118.png

 

tbraxton
22-Sapphire II
tbraxton22-Sapphire IIAuthor
22-Sapphire II
December 11, 2023

@MartinHanak thanks for the model. What you had to do to pattern this was exactly why I submitted this query. It requires the manual selection of patterned curves to be used in a sketch for a trajectory rib.  I am looking for a way to select all curves in the array for use in the sketch which may not be possible currently.

 

From PTC documentation on sketch for trajectory rib:

Sketch one or more lines, splines, or arcs to define the rib feature trajectory. The sketch can contain any number of open, closed, and self-intersecting curves.

 

 

tbraxton_0-1702319670274.png

 

M
MartinHanak24-Ruby III
24-Ruby III
December 12, 2023
@tbraxton wrote:

@MartinHanak thanks for the model. What you had to do to pattern this was exactly why I submitted this query. It requires the manual selection of patterned curves to be used in a sketch for a trajectory rib.  I am looking for a way to select all curves in the array for use in the sketch which may not be possible currently.

 

From PTC documentation on sketch for trajectory rib:

Sketch one or more lines, splines, or arcs to define the rib feature trajectory. The sketch can contain any number of open, closed, and self-intersecting curves.

 

 

tbraxton_0-1702319670274.png

 

Hi,

this is my last reply ... during testing I found that following sketch created inside Trajectory Rib definition is not valid. This means that it is useless to try to put all the hexagons into one sketch.

MartinHanak_0-1702404778932.png

 

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