DanBangert
Mechanical
I have a cam driven clamping system which has a roller and pin follower. I've been successfully using a thin walled (0.04" wall thickness) friction reducing bushing pressed into the ID of the roller to keep things moving. The bushing is a composite structure with a mild steel backing, a sintered bronze coating and a layer of Pb/Tfe. Increasing performance demands has increased bearing contact pressure over 38,000 psi. At this pressure the base metal used in the bushing (AISI1008 according to the manufacturer) is being cold worked, causing it to thin out, extrude and fail. Maximum loads are virtually static applications.
My pin and rollers are pretty exotic materials, both have yield strengths in excess of 200,000 psi. I need an alternative method to reduce the friction between the pin and roller at these extreme pressures. Geometric constrains prohibit increasing the sizes to reduce the contact pressure. At these pressures friction welding is always problem. Any suggestions for coating systems or special thin wall "bearings or bushings"? thanks for any assistance Dan
My pin and rollers are pretty exotic materials, both have yield strengths in excess of 200,000 psi. I need an alternative method to reduce the friction between the pin and roller at these extreme pressures. Geometric constrains prohibit increasing the sizes to reduce the contact pressure. At these pressures friction welding is always problem. Any suggestions for coating systems or special thin wall "bearings or bushings"? thanks for any assistance Dan
