8 Replies Latest reply on Apr 24, 2015 8:18 PM by Jared Conway

Pull-out force for a Morse taper

Ashley Howard Apr 10, 2015 3:55 AM

Hi, I am trying to determine the pull-out force required for a morse taper junction, where the trunnion has been mated with the bore and then inserted by a controlled distance so that the walls interfere by a certain distance as shown in the picture. I then used the contact set to show that the walls act as a shrink fit but am trying to figure out how to calculate the force required to disassemble the taper. Any help on this would be very much appreciated.

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Re: Pull-out force for a Morse taper

James Riddell Apr 10, 2015 5:56 AM (in response to Ashley Howard)

Have you tried a non-penetrating contact set with friction between the two surfaces?
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Re: Pull-out force for a Morse taper

Ashley Howard Apr 10, 2015 6:35 AM (in response to Ashley Howard)

I have set the contact to shrink fit with friction and ran the simulation which provided the contact pressure distribution along the two surfaces. I was wondering how I can obtain the axial force value that is required to separate the components?
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- Re: Pull-out force for a Morse taper
  
  Mike Pogue Apr 10, 2015 9:55 AM (in response to Ashley Howard)
  
  It's the average surface pressure * the contact area * the friction coefficient. The errors here are going to be very large--probably 30-50%
  
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Re: Pull-out force for a Morse taper

Ashley Howard Apr 10, 2015 4:23 PM (in response to Ashley Howard)

Is there a feature on Solidworks that provides the axial force required to eliminate the interference between the two parts?
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- Re: Pull-out force for a Morse taper
  
  Mike Pogue Apr 10, 2015 5:05 PM (in response to Ashley Howard)
  
  I'm not sure I understand the question. But the axial force to overcome the static friction is defined as above. If SW had some built in feature toward this end, that's how it would work.
  
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Re: Pull-out force for a Morse taper

Roland Schwarz Apr 11, 2015 6:23 PM (in response to Ashley Howard)

Have you checked Machinery's Handbook?
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- Re: Pull-out force for a Morse taper
  
  Mike Pogue Apr 12, 2015 6:55 PM (in response to Roland Schwarz)
  
  Lots of info on self-holding tapers. I can't find any extraction force, though.
  
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Re: Pull-out force for a Morse taper

Jared Conway Apr 24, 2015 8:18 PM (in response to Ashley Howard)

can you describe the actual physical process you are trying to model?

to me shrink fit doesn't really make sense
i'd also suggest using 2d simulation
and to get a force, you can apply a 0 displacement and the result will be the force to hold it in place
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