Tapered roller bearing the early damage you met? What are the reasons?

Small make up recently on the Internet to see a net friend asked the question: 'a few days ago just bought tapered roller bearings, today found bearing damaged, but found when I set down the outer ring, cage are in good condition no damage, this is the way it is? 'The Chinese bearing small make up to see this kind of phenomenon, I think about it, have seen a similar situation, that is a company in tapered roller bearing life after problems found through experiment. Less than 200 hours after operation was bearing, bearing is damaged, then disassemble set is also found that the bearing outer ring and cage after all in good condition no damage, but the roller working surface around the circle near the little head have varying degrees of flake ( As shown in figure 1) , as well as inner ring raceway near the small end face oil groove along the circumferential direction is also a ground printing ( As shown in figure 2) 。 Tapered roller bearing this early damage reason is what? China bearing network to tell you the cause of the premature failure of the tapered roller bearing mainly has the following points: ( 1) The set of bearing ring roller hardness and the hardness of mismatch, the hardness of inner ring is slightly higher than that of roller's hardness, make its enhanced the inner ring raceway left side pressure into the ability of roller. ( 2) Tapered roller bearing under the condition of zero load for line contact between the roller and raceway contact, because of the inner ring raceway grinding to keep edge, thus causing them to contact by a line contact between the roller and to approximate point contact. When the roller bearing is therefore large shear stress, stress concentration is produced. When the shear stress exceeds the fatigue limit of material, to produce fatigue crack. As the role of cyclic load, fatigue crack extension along grain boundary flake form, leading to early fatigue failure of the bearing. ( 3) Tapered roller bearing inner ring raceway grinding to keep edge is due to the inner ring raceway grinding process, raceway and improper grinding wheel clamping position adjustment, or choose the narrow end grinding width. Known from the analysis of the above, the tapered roller bearing failure, is due to the bearing inner ring in the process of grinding inner ring raceway of left side. Therefore, inner ring raceway in the grinding process, must assure properly selected and inner ring raceway grinding wheel width and grinding wheel clamping position accurately, avoid the production of inner ring raceway left side, as to avoid the early failure of the bearing.