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Interference fit coefficient of friction Question
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Posted by: mmc205

11/15/2004, 07:38:05

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I'm creating an interference fit calculator based off of Lame's Equation for thick walled cylinders, and I've derived it for my situation, but I can't seem to find good information or a good case study about the coefficient of friction in a interference fit.  Is it just the coefficient between the two materials, or are their other mechanisms at work.  Also, would the force to insert be the same as the retention force?  From experience, it seems retention is always higher than insertion force.






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Re: Interference fit coefficient of friction
Re: Interference fit coefficient of friction -- mmc205 Post Reply Top of thread Forum
Posted by: Cragyon
Bart
11/17/2004, 17:13:18

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Check out the following links on engineers edge /friction_menu.shtml

 







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Re: Interference fit coefficient of friction
Re: Interference fit coefficient of friction -- mmc205 Post Reply Top of thread Forum
Posted by: gumbo

11/15/2004, 21:56:52

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Generally I just use the coeficient of friction values for the two materials but it is obviously dependent on surface finish as well.  The insertion force will actually be the dynamic coefficient of friction once movement has started; whereas, the retention force will be based on the static coefficient.  Note that in our applications we almost always utilize heat differentials to assemble press fits rather than try to press them together. 






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Re: Interference fit coefficient of friction
Re: Re: Interference fit coefficient of friction -- gumbo Post Reply Top of thread Forum
Posted by: mmc205

11/16/2004, 07:23:43

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For my application, surface finishes will be 32uinch or better, however the parts will be gold electroplated, so I'm guessing i should use friction values for gold, while using the properties for the base material for all of the stress calculations.  Thanks for the info






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