Calculate temperature rise from turning a screw spindle in a nut

[SC83]

Hi,

Does someone know how I can calculate the temperature rise from turning a screw spindle in a nut (thus no ball screw)?
The spindle is of stainless steel, the nut of brass. I don't use any lubrication.

Thanks.

 

[miningman]

Would this be with 2 thou , 10 thou or 30 thou clearance??

 

[EdStainless]

With what axial loads?
And any misalignment?

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[miningman]

plus of course we would need to know what grade of stainless steel and is this exercise taking place in a location where global warming is known to exist.

 

[Tmoose]

What force is will the screw be exerting? How many revolutions, what rpm, mass of nut, is the nut affixed firmly to a component of considerable size ?
Is the desired temperature rise of the nut, or the screw, or the interface ?

 

[Artisi]

Think the OP might get the message relayed so eloquently.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[Tmoose]

14 down, just 6 to go.

 

[rb1957]

"the temperature rise from turning a screw spindle in a nut" ... either
1) "not much" and wouldn't endure for much time, or
2) dependent on friction ... work due by torque = strain energy added to bolt + lost work (like heat).

another day in paradise, or is paradise one day closer ?

 

[EngineerTex]

It is likely to be so low and so dependent on things that you can't easily quantify that you would have to determine it experimentally. For example, if the nut is cut such that it causes strain in the threaded shaft, i.e., making it bow back and forth, this could easily generate as much or more heat as the nut on the shaft.

Generally speaking, though, the heat generated will be expressed as: Energy = Torque' * Theta, where Theta is the angular distance turned and Torque' is the torque due solely to the friction between the nut and the shaft. However, I think that you're going to have an extremely difficult time separating out the torque due to the friction from the torque due to moving the load.

So... what is the application? Anything interesting?

Engineering is not the science behind building. It is the science behind not building.

 

[rb1957]

it'd be easier to figure out the useful work done (the strain energy) and then say the difference (to the applied work) is heat energy ... presumably shared (equally?) between the nut and the bolt.

another day in paradise, or is paradise one day closer ?

 

[racookpe1978]

Well, I can raise the temperature of a stuck or rusty nut by unscrewing it, so the rise in a 1/2 nut turned quickly (less than 25 seconds) is "measureable" by hand at maybe 10 deg F. But I'm putting out more energy than that just by the muscle energy standing there.

 

[hydtools]

Here is some reading material.

https://brucesherwood.net/wp-content/uploads/2017/06/Friction1984.pdf

Ted

 

[Tmoose]

Steven_ has not logged in since Jan 13, the day of his (original) post.