Pushing Up A Taper 1

[Daparojo252]

I am looking for some help.

I have a internal tapered sleeve that needs to be pushed up a solid tapered shaft (similar to old propellor methods). I need to push it up by 1mm.
I am presuming that the thickness of the sleeve in the middle is 8mm, and the length is 115mm. The angle is 5.9 degrees inclusive. It will be steel/steel - no lubrication so the friction could be taken as 0.15
The Sleeve is 115mm Long, Taper Small End ID 64.50mm, Taper Large End 79.40mm.


What I am looking for is to calculate the axial force required to move it 1mm into position. Can anyone help?

 

[EdStainless]

If both parts were lathe turned then the friction will closer to 1, or higher.
Is this tight? are you going to have to yield the sleeve to do this?

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P.E. Metallurgy

 

[Daparojo252]

0.15 friction is used for static friction on steel/steel, 0.18 if lubricated - this has been taken as standard. The application is dry hence 0.15

We wouldn't yield the sleeve material.

 

[EdStainless]

What is the applied force from? If there are no machine marks resisting the movement and there is clearance why isn't this just slide into place?
If these pieces both have lathe turning marks on them you will have to deform metal to move them, that is what I was getting at.

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P.E. Metallurgy

 

[dgallup]

I take this to be a cone on a cone and the 1 mm travel is from the point the parts solidly mate, is that correct? There are online press fit calculators that I think would get you in the ball park. Just assume the interference that you will get with the 1 mm travel.

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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

 

[hydtools]

You know the geometry of the taper. Therefore, you know the 'stretch', increase in diameter due to pushing the axial displacement 1mm. Maybe equally divide the strain between the sleeve and hub. Calculate the strain, then the stress and interference pressure. Then calculate the force required to cause that stress plus the force to overcome the friction.

Ted

 

[tbuelna]

Make your life easy and use oil injection.

 

[GregLocock]

"0.15 friction is used for static friction on steel/steel, 0.18 if lubricated:"

Think about that.

Cheers

Greg Locock


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