Bearings inside an oven
Bearings inside an oven
(OP)
Hi,
Does anyone has used bearings inside a Industrial
oven.(Inside baking chamber)
We tried to use high temperature bearings in an oven but bearing seized after 3-4 weeks of operation.
Can anyone shed more light on this........
Does anyone has used bearings inside a Industrial
oven.(Inside baking chamber)
We tried to use high temperature bearings in an oven but bearing seized after 3-4 weeks of operation.
Can anyone shed more light on this........





RE: Bearings inside an oven
Temperature in the oven.
Temperature rating of the bearings
Bearing part number / style
Bearing lubrication method. Greased?
Shielded? Sealed?
Bearing Speed
Some idea of expected bearing load in relation to bearing load rating.
Pictures would be nice.
Disclaimer: I'm not sure this is something anyone can solve, and I'm certainly no expert.
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(2B)+(2B)' ?
RE: Bearings inside an oven
The usual solutions include either:
- extending the shafts so the bearings are outside the oven, or
- bringing a more moderate outside environment inside the oven, just around the bearings.
The next thing I'd try is something like NASCAR brake ducts to bring outside air to the bearings and to take away the heated air from their vicinity. If they're insulated well enough, they should not interfere with the oven's control loop.
Mike Halloran
Pembroke Pines, FL, USA
RE: Bearings inside an oven
Is this a rolling element bearing?
Graphalloy makes some high temperature bearings.
I have used rolling element bearings without seals and a constant flow of grease for some moderate elevated temperatures. But, this cannot allow a pile of combustible crud inside the oven...
RE: Bearings inside an oven
Superconducting guys think −243.2 °C is "high temperature"
During the summer my wife thinks 78°F is "like an oven."
RE: Bearings inside an oven
I assume if it does not have grease or if lubed a dry coat of some sort. Tell us more!
RE: Bearings inside an oven
RE: Bearings inside an oven
RE: Bearings inside an oven
if you use a bearing inside an oven, the temperature (normally) does not allow the usage of any kind of grease. So you have to use a solid lubricant like graphite (already mentioned) or a kind of bearing which avoids adhesion or cold welding between raceway and rolling elements in dry running conditions.
It's not necessary to go to a all-ceramic bearing. To reach the described effect it's enough, if one component is made of ceramic. Either rolling elements or rings. This kind of bearing is called a hybrid bearing.
High nitrogen steels like Crondur 30 are resistant up to 450degC, super-alloys like Inconel 718 are resistant up to 800 degC.
There are only two things you have to keep in mind:
1. the load capacity will decrease. In dry running conditions it will be 1.56% of the value you will find in a catalogue.
2. the raw material quality for ceramic components is very important. If there are particles in the raw material (bad, but cheap quality), the end product will fail.
Hope this helps a little bit. To help more, we need more information like temperature, loads (radial and thrust)...
Greetings
Tobias
RE: Bearings inside an oven
The "neighbour" post. No grease, no rolling friction.
Gunnar Englund
www.gke.org
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