Non-lubricated Large Bushing in Mining - Material and Design
Non-lubricated Large Bushing in Mining - Material and Design
(OP)
I am looking for a way to improve our pin connections used in large mining equipment. The pins diameters range from 3-10" with bearing pressure reaching 7500 psi. The velocities are very low with small osciallation. And of course the bushing/pin will see dirt and impact loads, and no p/m will ever be done (hence non-lubricated). Traditionally, manganese steel bushing with 4340 pins have been used with poor results. Is there better choice of materials? I also could use a good sources of design information (rule of thumb for hardness difference, design methodology, ect).
Thanks,
Ken
Thanks,
Ken





RE: Non-lubricated Large Bushing in Mining - Material and Design
Here is the one that I've always used. I don't know about the available diameters. They do go to 3". I would give them a call to see what is available.
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RE: Non-lubricated Large Bushing in Mining - Material and Design
What do Caterpillar and Komatsu do?
Boosting hardness can help some with pure abrasion, but running similar metals unlubricated can bring on BIG galling problems.
I have to think incorporating less-similar materials, , with highly finished round holes and shafts, EP dry lube at assembly, and rudimentary sealing (even at the expense of projected bearing area) would reap huge benefits.
RE: Non-lubricated Large Bushing in Mining - Material and Design
RE: Non-lubricated Large Bushing in Mining - Material and Design
help like the aisi 8660 for the pins
would be a better choice. They are coating
a lot of shaper cutting tools to make them last
longer. I wonder if that would help in
this case.