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Modeling an overmold

Question asked by Brendan Zarechian on Jan 25, 2010
Latest reply on Feb 5, 2010 by Brendan Zarechian

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Hello,

I am trying to model an overmolded part, where I have the models for the first shot and second shot tool design, but I don't have the second shot modeled with the cavity of the first shot in it. In essence I would like to subtract the first shot part from the second shot to create this cavity in the second shot. I need this done because I want to do a moldflow on it for a core shift analysis, but I need the second shot to have the cavity in which the first shot lays.

Sorry if this sounds confusing, I'm trying to word it as best I can, But my basic question is, can you subtract a model's geometry from another model?

Thanks,

Brendan

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Phil Marra Jan 25, 2010 3:51 PM

Assemble the two parts in an assy. Then edit the overmold while in assy mode and using "cavity" command select your substraite and it should remove the 1 st part from the over mold

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Brendan Zarechian @ Phil Marra on Feb 5, 2010 1:53 PM

Thank you Phil,

1st try worked like a charm!

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Jeremiah Feist Jan 25, 2010 3:53 PM

you can either do it in an assembly of the 2 (or More) parts -> edit overmold in context, insert -> feature -> indent

or you can insert the under-mold (first shot) into the overmold part and use the combine feature.

Jeremy

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1-4EQZK9 Jan 26, 2010 6:49 AM

Brendan,

If I have enough time in my presentation at SWW, I'll be talking a bit about overmolds and how to do them. They are best done in the master part (master model) and yes, you can use the Combine feature to subtract solid bodies. There are many successful techniques for creating co-molds and probably the best is to create a surface body that is comprised of an extruded area to represent the boundary of the co-molded area and then knitted with an offset of the original surface (say .04 inch.) This surface body is then used in a split part feature to subtract the two from each other.

Regards

Mark

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Matt Lombard Jan 26, 2010 10:59 AM

In my book on surfacing, I describe three different methods for creating overmold geometry:

1) detailed moldable geometry

2) schematic model showing different materials as bodies, but without detailed interior features

3) "looks like" model where you simply split a face and color it

For the first one I modeled the toothbrush as a single part, then used Split to split away the overmolded areas, and used ribs and other features to build back the underlying structure.

In the second one I modeled the toothbrush again as a single part, split out faces for the overmolded areas, copied the faces of the overmold, thickened them and used them to cut away part of the base body.

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6 Replies

Phil Marra Jan 25, 2010 3:51 PM
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Assemble the two parts in an assy. Then edit the overmold while in assy mode and using "cavity" command select your substraite and it should remove the 1 st part from the over mold
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- Brendan Zarechian @ Phil Marra on Feb 5, 2010 1:53 PM
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  Thank you Phil,
  
  1st try worked like a charm!
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Jeremiah Feist Jan 25, 2010 3:53 PM
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you can either do it in an assembly of the 2 (or More) parts -> edit overmold in context, insert -> feature -> indent

or you can insert the under-mold (first shot) into the overmold part and use the combine feature.

Jeremy
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1-4EQZK9 Jan 26, 2010 6:49 AM
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Brendan,

If I have enough time in my presentation at SWW, I'll be talking a bit about overmolds and how to do them. They are best done in the master part (master model) and yes, you can use the Combine feature to subtract solid bodies. There are many successful techniques for creating co-molds and probably the best is to create a surface body that is comprised of an extruded area to represent the boundary of the co-molded area and then knitted with an offset of the original surface (say .04 inch.) This surface body is then used in a split part feature to subtract the two from each other.

Regards

Mark
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Brian Place Jan 26, 2010 7:38 AM
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http://pareldesign.blogspot.com/2007_07_01_archive.html
Here is a good example
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Matt Lombard Jan 26, 2010 10:59 AM
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In my book on surfacing, I describe three different methods for creating overmold geometry:

1) detailed moldable geometry

2) schematic model showing different materials as bodies, but without detailed interior features

3) "looks like" model where you simply split a face and color it

For the first one I modeled the toothbrush as a single part, then used Split to split away the overmolded areas, and used ribs and other features to build back the underlying structure.

In the second one I modeled the toothbrush again as a single part, split out faces for the overmolded areas, copied the faces of the overmold, thickened them and used them to cut away part of the base body.
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Modeling an overmold

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