Mechanism Analysis of Overloading Contact Test

Abstract:

Taking the roller system of the heavy equipment telescopic boom as the research object, the overloading contact tests of the rolller system and the supporting plate was conducted to investigate the wear mechanism of friction specimens, in order to improve the wear resistance and the life span of the mechanical parts. By using scanning metallography, SEM and EDS techniques, the surface morphologies, chemical composition and plastic deformation of the worn test specimens were analyzed. The results show that under heavyduty conditions and with the increase of wear times, the wear mechanism of the supporting plate is both abrasive and adhesive. However, the wear of the roller is less serious than that of the supporting plate because of its higher hardness. The wear mechanism of the roller is both abrasive and mild adhesive. A study of the worn roller layer microstructure indicates that lamellar pearlite has dislocation movement and microstructure damage in the local area, which shows that the plastic deformation of the roller has happened under overloading contact.