Desirable hardness differential
Desirable hardness differential
(OP)
I have a pin (300mm diameter) running in a bush 25mm thick.
rate of rotation is around 10rpm. Load is around 300-400 tonne. Yes heavy. The wear rate is currently an issue, pin is around 600HB. Question is what is the optimal hardness of the bush?.
At the moment i favor a hardness differential of 10-15%. But i lack any trial data to back this up.
rate of rotation is around 10rpm. Load is around 300-400 tonne. Yes heavy. The wear rate is currently an issue, pin is around 600HB. Question is what is the optimal hardness of the bush?.
At the moment i favor a hardness differential of 10-15%. But i lack any trial data to back this up.





RE: Desirable hardness differential
RE: Desirable hardness differential
I think hardness is the last thing I'd look at. Once the geometry is optimized or at least improved, Material choices can easily make 10 X difference in wear rates. Dissimilar is almost always best. Even After material is optimized, Lubrication beats hardness at least 10X.
RE: Desirable hardness differential
RE: Desirable hardness differential
RE: Desirable hardness differential
The different steel structures (martensite vs austenite) and the excellent work hardening characteristics (of the bush) often serve to make the comnbination of hardened steel against manganese steel work well.
RE: Desirable hardness differential
Here is a bearing that I've seen used in similar situations with good success. There used to be more information on the site but it still may be available as a booklet if you contact them. Like everything else they were gobbled up.
http://www.ermcompp.com/where-use-maxam.htm