4 Replies Latest reply on Nov 26, 2012 2:59 PM by April Dunham

Stud Press Fit Force

April Dunham Nov 19, 2012 10:48 AM

I've been encountering problems with SolidWorks Simulation. Whenever I try to press a pin into a block with a hole (there is interference), the simulation does not want to run and only fails. It doesn't tell me the problem or why it continues to fail. There is a knurl on the pin so I am not sure if the points on the knurl creates a problem for solidworks. I have tried to fillet the points to create less of an issue with points.

To avoid this issue, I have tried to just take the block and put an internal pressure where it will deform the block's inner diameter to match the outter diameter of the pin. However, when I run the same simulation over and over again at different pressures, the diameter of the inside remains the same, even at significant differences in pressures.

Please give some suggestions that may fix this issue. Thanks

Re: Stud Press Fit Force

Justin Strempke Nov 19, 2012 11:43 AM (in response to April Dunham)

April, I have a couple questions for you. Are you (1) using the Shrink Fit option, and (2) are you trying to find stresses relating to the knurl or is it an option to suppress it alltogether and use a plain cylinder?

I personally have never had great luck with the distance deformation option, it never seems to hit the mark!
Like Show 0 Likes(0)

Actions
- Re: Stud Press Fit Force
  
  April Dunham Nov 19, 2012 12:55 PM (in response to Justin Strempke)
  
  1) No, I have not used the Shrink Fit option.
  
  2) We are trying to find the force it would take to push the pin with the knurling into the hole. Both the knurl and the block would deform a bit so using it as a plain cylinder would not work. After it deforms, I also want to see how much I can torque the pin before spinning loose. Deformation would be a factor in torquing.
  
  Do you know if there is a way to measure the inner diameter instead of just using the sketch option and drawing a circle along the the model?
  
  Like Show 0 Likes(0)
  
  Actions
Re: Stud Press Fit Force

Roland Schwarz Nov 19, 2012 3:43 PM (in response to April Dunham)

This is a fairly complex problem for FEA. However, you may be able to find a formula to give you an approximate value. There are a few calculators available on the interweb.

http://www.tribology-abc.com/calculators/e3_8.htm

http://www.meadinfo.org/2009/07/press-fit-pressure-calculator-optimize.html
Like Show 0 Likes(0)

Actions
- Re: Stud Press Fit Force
  
  April Dunham Nov 26, 2012 2:59 PM (in response to Roland Schwarz)
  
  Here is a photo. Currently, I am trying to get the program to run at all where the diameters are equal and the pin is only a cylinder. The pin is steel and the block is Aluminum 6061-T6
  
  Like Show 0 Likes(0)
  
  Actions

Go to original post