- #1
cherish
- 20
- 3
Assemble "shrink fit" with a big shaft ∅203 mm?
Dear all,
Just a short question that is it possible to contract the shaft in liquid nitrogen and heat up the hub around 300°C so that we can assemble them together quickly? We are delivering a prototype to our customer with a tight requirement on interference fit from drawing of them as in attachments.
At the first time we calculated the contraction of steel per degree of linear expansion/contraction and think that it's ok and we just freezed the shaft and then got stuck about 1/3 (100 mm fit), after trying to disassemble but couldn't then we cut out the hub to keep the shaft for reason of material in stock :(
Now is the last chance and we intend to freeze shaft and heat up hub as above but do we really need to freeze the shaft like this, or the contraction of steel will not work in this type of shaft because we did not have suitable tools for measuring accurately in a very quick time..
Thanks very much for any advices
Dear all,
Just a short question that is it possible to contract the shaft in liquid nitrogen and heat up the hub around 300°C so that we can assemble them together quickly? We are delivering a prototype to our customer with a tight requirement on interference fit from drawing of them as in attachments.
At the first time we calculated the contraction of steel per degree of linear expansion/contraction and think that it's ok and we just freezed the shaft and then got stuck about 1/3 (100 mm fit), after trying to disassemble but couldn't then we cut out the hub to keep the shaft for reason of material in stock :(
Now is the last chance and we intend to freeze shaft and heat up hub as above but do we really need to freeze the shaft like this, or the contraction of steel will not work in this type of shaft because we did not have suitable tools for measuring accurately in a very quick time..
Thanks very much for any advices