Research on Real Surface Stability of Cone Bit Sliding Bearing Under Repeated Contact Condition

The cone bit is the most principal rock breaking tool in drilling engineering. statistical analysis of field data shows that early damage and failure sliding bearing one main reasons affect service life performance real process. Aiming at complex working environment with heavy load, high temperature mixed lubrication, paper establishes a multilevel line contact model rough surface carries out finite element modeling from perspective mechanics. Then Von Mises stress, Residual normal deformation Inelastic dissipated energy are obtained under different cycles loading-unloading. results show increase loading-unloading, part edge area enters into elastic shakedown asperities central occur irreversible plastic deformation, which has significant influence on stability bit.