Bearing Journal Rebuild
Bearing Journal Rebuild
(OP)
Hello,
We have a shaft's journal damaged from a locked bearing and are looking at options to refurb it. I know there are some processes to deposit more material down and then turn to spec - can anyone provide some guidance/considerations for what to select? I know bending stresses, thermal growth and other conditions are important but wanted some thoughts on the general fundamentals of the processes themselves and if anyone's had success/failure with them. I only know that the shaft is carbon steel, nothing more specific on the type. 160 mm nominal diameter, 100 mm wide bearing. Feedback would be greatly appreciated.
We have a shaft's journal damaged from a locked bearing and are looking at options to refurb it. I know there are some processes to deposit more material down and then turn to spec - can anyone provide some guidance/considerations for what to select? I know bending stresses, thermal growth and other conditions are important but wanted some thoughts on the general fundamentals of the processes themselves and if anyone's had success/failure with them. I only know that the shaft is carbon steel, nothing more specific on the type. 160 mm nominal diameter, 100 mm wide bearing. Feedback would be greatly appreciated.





RE: Bearing Journal Rebuild
With so few details, I would default to HVOF tungsten carbide. It is expensive, but has worked very well for shaft repairs in a variety of applications?
Johnny Pellin
RE: Bearing Journal Rebuild
Thanks for the response. The link to the bearing is here Link Load is approximately up to 30,000 lbs., just 60 rpm. Cannot provide machine detail but service is continuous load, not shock-loading. Temperature variations less than 40 deg. F.
RE: Bearing Journal Rebuild
Johnny Pellin
RE: Bearing Journal Rebuild
Repair methods that don't monitor the runout on the rest of the shaft can cause BIG PROBLEMS.
In-place weld/grind repairs, even ones that create handsome accurate journals are especially vulnerable to missing the "big picture."
The API Recommended Practice RP 687 rotor repair is full of practical information about the processes and pitfalls of repairing shafts and rotors.
The advice on straightening is especially painful, but needs to be considered carefully.
RE: Bearing Journal Rebuild
I will say that this journal is part of a shaft on a precision machine, so you're especially right about the runout. Fortunately we have specs on the tolerances to go by. Do any of these treatments have sensitivity to the base material used or dissimilarity? I ask because again I'm not sure exactly what kind of steel we have. Maybe that resource has this information.
RE: Bearing Journal Rebuild
Johnny Pellin
RE: Bearing Journal Rebuild