Force fitting a sleeve onto shaft when designed to be a shrink fit.

[BuonGiorno]

If a hollow tapered shaft and a sleeve is designed to be fitted, by thermally expanding the sleeve and cold shrink fitting the hollow shaft with dry ice, can the item be assembled or dissembled by pressure alone?
I have been told that such assemblies can be disassembled without temperature controls, if enough pressure is applied. (That pressure for a shrink fit is 3 to 5 times greater than a press fit. ) Alternatively, I have also been told to never apply pressure to a shrink fit design without temperature controls, because it can cause galling and cause the assembly to lock up.
Please advise.
Thanks...

 

[SWComposites]

Disassembled, probably with enough force applied, if you don’t care about damaging the parts.
Assembled, no.

 

[TugboatEng]

Press fit is for location, shrink fit is for power transmission. It's two completely different subjects.

You can simplify your process. Take an inside micrometer, set it 0.005" over your shaft diameter, and heat your part until your micrometer passes through. There is no need for dry ice. In most cases there is no need for the micrometer. Mounting temperature is usually around 150°F over ambient. Your field techs can judge this by spitting on the part . I use the mic. There should be no need for dry ice on the shaft. Liquid nitrogen is used when installing body fit bolts in couplings because it's faster to shrink the bolt than expand the coupling.

 

[dgeesaman]

It all depends how much the shrink fit is and what temperatures your materials can tolerate.

Some materials can grab and seize, making a press operation destructive.

Is the 'hollow tapered shaft' a cylindrical bore with a taper surface for the shrink fit? If so, what is the taper angle? How thick is the wall? (Hollow shafts can be shrink fitted but it very much affects the internal forces).

I think you might have received good advice, but it might be limited to your typical application. When we generalists read them it reads as nonsense.