Question

Problem #5/20 marks For a boundary-lubricated bearing, select an appropriate bearing material when nominal pressure 3.6 MPa, sliding velocity 0.262 m/s and operating temperature range (80°C 100°C) 1. Estimate the service life of a boundary-lubricated bushing made of sintered bronze having rotary motion, when the expected maximum wear is 0.2 mm in a clean environment with sliding velocity 15 mm/s and nominal pressure 2 MPa. 2.

Answer 1

Solutions:

1. Cast Iron.

2. For finding sliding time or the service life is,

t=w/(k*p*v)

where, w =0.2 mm

k = Specific wear (depends on type of load and lubrication)= 30*10^-6 (table attached).

p= 2 N/mm²

v = 15 mm/s

t = 222.22 hours