Bushing ID after Shrink Fit - Interference Fit
Bushing ID after Shrink Fit - Interference Fit
(OP)
Hello,
Looking for some help on calculating the ID of a bushing that has been shrink fitted into a larger bushing. I can't seem to find an equation for this. I have calculated the interference pressure, and the hoop stress'. Application is we have two manufactures of the parts that are shrink fitted together. We would like to tolerance the the interference fit and ID of the inner hub to allow for +/- .005" of the inner hub ID after the shrink fit into the outer hub.
Material Assumptions - Modulus of Elasticity = 30,000 ksi - Poisson's Ratio = .3
Outer Hub OD = 32"
Out Hub ID = 22"
Inner Hub OD = 22.050"
Inner Hub ID = 18"
Interference Pressure ~ 8693 psi
Outer Hub Hoop Stress ~ 24,276 psi
Inner Hub Compression Stress ~43,899 psi
So I am trying to calculate what the ID of the inner hub would be after the shrink fit operation assuming the above is true? We would like to get away from having to do a final machining of the bore after assembly if possible. I was able to find a few old threads on this website about calculation of area but they didn't really make any sense to me. Any help in the right direction would be appreciated.
Best Regards,
Looking for some help on calculating the ID of a bushing that has been shrink fitted into a larger bushing. I can't seem to find an equation for this. I have calculated the interference pressure, and the hoop stress'. Application is we have two manufactures of the parts that are shrink fitted together. We would like to tolerance the the interference fit and ID of the inner hub to allow for +/- .005" of the inner hub ID after the shrink fit into the outer hub.
Material Assumptions - Modulus of Elasticity = 30,000 ksi - Poisson's Ratio = .3
Outer Hub OD = 32"
Out Hub ID = 22"
Inner Hub OD = 22.050"
Inner Hub ID = 18"
Interference Pressure ~ 8693 psi
Outer Hub Hoop Stress ~ 24,276 psi
Inner Hub Compression Stress ~43,899 psi
So I am trying to calculate what the ID of the inner hub would be after the shrink fit operation assuming the above is true? We would like to get away from having to do a final machining of the bore after assembly if possible. I was able to find a few old threads on this website about calculation of area but they didn't really make any sense to me. Any help in the right direction would be appreciated.
Best Regards,





RE: Bushing ID after Shrink Fit - Interference Fit
Any mechanical engineering book such Shigley's or Norton has the explanation and formulations.
If the end result is +/- 0.005" then the OD tolerances of the inner hub and the ID tolerances of the outer hub must be much smaller than +/-0.005".
RE: Bushing ID after Shrink Fit - Interference Fit
RE: Bushing ID after Shrink Fit - Interference Fit
Now over to the experts who can calculate that reduction.
je suis charlie
RE: Bushing ID after Shrink Fit - Interference Fit
This has worked well enough for my applications in the past. If you need a really tight tolerance, you should be reaming bushings post-install anyhow.
YMMV
RE: Bushing ID after Shrink Fit - Interference Fit
If you require good a precise finished ID then boring the assembled ID may be the only solution.
Co-linearity/concentricity of the finished ID to 32" OD will require careful shepherding of all the ID and ODs as well.
If both materisls' E = 30,000 ksi Sounds like the "bushing" is made of steel as well. Is that OK for wear, or a manufacturig convenience?
RE: Bushing ID after Shrink Fit - Interference Fit
RE: Bushing ID after Shrink Fit - Interference Fit
http://www.roymech.co.uk/Useful_Tables/Mechanics/C...
or
http://www.tribology-abc.com/calculators/e3_8.htm
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Bushing ID after Shrink Fit - Interference Fit
RE: Bushing ID after Shrink Fit - Interference Fit
je suis charlie