The Performance Study Of The Steel Impact Wear

Firstly, using numerical techniques, the effect of oil starvation on thermalelastohydrodynamic lubrication (EHL) in simple sliding point contact with surfaceirregularity is inwestigated. The oil is a Newtonian flow model and a Ree-Eyring flowmodel. The results show that, under starved condition, the existence of the groove onsurface2sharpens the pressure and temperature rise at the leading and trailing edgesof it. And the risings in pressure and temperature are aggravated by the increasingdegree of oil starvation. Under a starved oil supply condition, the existence of thesurface irregularity is more harmful and tends to came lubrication failure.Then, experiments were carried out to study the surface damage of several kindsof steel plates impacted reciprocatingly by a steel ball. The force was imposed by theelectromagnets and the time relay. Under a constant frequency, a steel ball was hit theplates of45#steel,40Cr, tempered45#steel and45#steel with a weld layer,respectively. Three contact conditions are employed: dry contact and lubricatedcontacts with two oils of different viscosity. By changing the load and impactingtimes, the surface damage and wear was explored. It was found that, the surface for allmaterials was damaged greatly, plastic deformation existed in each stage. The depthand volume of the dent increased with the impacting times and the load. Lubricationcan effectively reduce the surface damage, and change the pressure distribution form.Using higher viscosity oil PB1300may cause oil starvation in the center of dentUnder dry contact condition, superfine powder is found inside the dent. Themicrocrack occurs inside the lubricated dent. The degrees of the superfine powder andthe microcrack increase with the impacting times and the load.