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Best practice to model a Flex-rigid PCB

Creator
Creator

I need to design a PCB that will have a rigid - flex - rigid form.


I believe that the right way to model it will be in the Sheet metal environment. So I can design it in the folded position and then make the flat manufacturing form.


My problem is I could not find a way how to change the thickness of the model in the flex regions as it will be in reality.
Any idea on the subject will be welcome.

 

I use SE ST10


Thanks,
Zohar

11 REPLIES 11

Re: Best practice to model a Flex-rigid PCB

Gears Phenom Gears Phenom
Gears Phenom

Hi @ZoharML_

 

 

in Sheet Metal you can have only one thickness for the whole part.

 

regards,

 

Arek

Re: Best practice to model a Flex-rigid PCB

Gears Phenom Gears Phenom
Gears Phenom

Hi @ZoharML_

 

I suggest using the Part or Surface environment to create this model.

 

 

Regards,

 

Arek

Re: Best practice to model a Flex-rigid PCB

Creator
Creator

If the PCB is modeled in as part (so it can have 2 thickness), how could the flat configuration be made?

 

Re: Best practice to model a Flex-rigid PCB

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor

Hi @ZoharML_

 

 

 

in part You can create a "Blank Body Flat" from any surfcae of that part..

 

20180806_1237.png

 

 

Hope this helps!

 

 

regards
Wolfgang

Re: Best practice to model a Flex-rigid PCB

Creator
Creator

Thanks Wolfgang,

 

Did not know about this function.

 

I'm almost there…

Normally in PCB the flex part is in the middle of the Rigid part so I don’t get a connected surfaces.

I made an offset surface, so I will have a connected set of surfaces, but I cannot select them in the Blank Body function.

 

Capture.JPG

 

Any easy way to pass this?

Re: Best practice to model a Flex-rigid PCB

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor

Hi @ZoharML_

 

 

OK, I would do it in the following way:

 

  • start with a PSM document and create a small tab (smaller thickness and later bending area)
  • change over to Part Mode and create the left and right areas of Your PCB
  • either now or before the last step You can create  a Bend in PSM mode 
    and
  • You now can create the flat pattern of this sheet metal part with different thickness values

See pictures:

 

20180806_1723.png20180806_1722.png

regards
Wolfgang

Re: Best practice to model a Flex-rigid PCB

Creator
Creator

Wolfgang,

I took your ideas and took them to the limits...

I can now model any Flex-rigid PCB that I can imagine!

 


 

The principle to model this is:

  1. Use a Part Sheet Metal part as the base in which all the layout of the card will be drawn.
  2. Tools -> Switch to is used to move to part environment to draw the area of the rigid PCB (with a larger thickness)
  3. Switch back to sheet metal to add all the bends to the flexs.
  4. Create the flat pattern of the PCB.

 

Limitations:

  • If the PCB has more than one flex in it, the bends must be added after you finished to draw all the layout (using tabs) and make the protrusions of the rigid areas. If you add bends before that the flatten will fail!

 

  • For the first flex you can use flange / counter flange and the flatten will not fail.

 

Have fun,

Zohar

 

bent.JPGflat.JPG

Re: Best practice to model a Flex-rigid PCB

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor

Hi @ZoharML_

 

 

 

well done!

Great Job!

 

 

regards
Wolfgang

Re: Best practice to model a Flex-rigid PCB

Gears Honored Contributor Gears Honored Contributor
Gears Honored Contributor

Hello @ZoharML_

 

It seems you have marked your own reply as 'Accpeted Solution'

You should really mark one of the other messages (could be multiple - all that helped you) as 'Solutions'.

In future, people wil not know which is the correct solution.

 

Thanks.