Cause Analysis on Wear Hollow on Screw Hole of Bearing Stand

Wear hollow was found on some screw holes of bearing stand of vibrating screen. By means of field investigation, material testing, abrasive dust collection, wear quantity calculation and so on, the cause of wear hollow was analyzed. The results showed that the kind of destruction was belonged to fretting wear. By reason of it was ignored that the identity of bolt spiral direction and acceptance force direction in design. Bolt was rotated gradually on condition that high frequency vibration, little relative movement came about between bearing stand and bolt, which was from adhesive wear at the initial stage to abrasive wear at the later stage. So wear hollow was the result of fretting damage owing to bearing stand was extruded and rubbed repeatedly by solid foreign matter.