Pump with thrust ball bearing wear failure for example

Thrust ball bearing wear failure is one of the common failure, for example, a certain type of hydraulic pump in use process, within the pump thrust ball bearing, the serious wear failure under specific thrust ball bearing wear failure forms, the bearing network ( Hereinafter referred to as:) Made the detailed introduction. Thrust ball bearing 1, pump with thrust ball bearing wear failure morphology by axial circle, the thrust ball bearing seat, cage, and 11 of steel ball. The worn shaft ring raceway, local visible rough pits, frayed and squeezing effect of raceway 'climbing' phenomenon in a part of the edge of a raised ( As shown in figure 1, figure 2) ； Seat the overall damage is lighter, raceway are golden relatively smooth surface, local visible small pit and rolling groove ( See figure 3) 。 11 steel ball in the high temperature change color black, 3 ball grain crushing ( The red arrow) , 8 ball relatively intact in varying degrees of wear or extrusion damage, individual ball stuck in the hole can't turn the cage round hole wear and edges bulge ( See figure 4) 。 Figure 1 axis wear ring raceway overall appearance figure 2 axis ring raceway amplifier appearance figure 3 ring raceway amplifier appearance figure 4 2, steel ball steel ball and cage appearance injury of fracture characteristics of the broken 3 ball fracture characteristics are basically the same, fracture macroscopic surface is blue-black, worn surface; Micro is given priority to with toughening nest characteristics, local visible along the crystal + toughening nest mixed characteristics, the overload fracture characteristics ( See figure 5) 。 Macro morphology microstructure figure 5 ball fracture macroscopic and microscopic figure 3 fault bearing, thrust ball bearing wear failure results axial circle, seat and ball are not seen fatigue spalling, shows that the early stage of bearing fault performance should be wear and tear, access to the early stage of the data, found that the bearing fault is similar morphology, past bearing shaft ring wear, most steel ball surface have a large area of wear and black phenomenon, binding in cage pocket hole can not rotate. Appear the phenomenon, should be a bearing in the process of failure, the wear of the large number of scrap metal pinching in cage pocket hole, hindered the ball rotation, until the card dead, ultimate bearing axial ring and ball cage components have serious sliding wear. The thrust bearing in the pump assembly seat diameter when using no positioning, mainly by 6 spring pre-tightening force produced by pressure outer end face positioning, bearing in the process of work to carry alternating axial eccentric load, will inevitably be bearing race radial run-out, radial deviation, with the increment of seat radial movement, the contact Angle will be significantly reduced, serious when can make the ball appear 'climbing' state, resulting in the 'climbing' status are available from shaft circle or seat channel abnormal contact traces in judgment. If the bearing installation, axial circle in positioning, form the initial eccentricity, combined with the working process under the action of alternating axial eccentric load, bearing race again certain radial run-out, the combination, will make the seat radial movement quantity increased obviously, this will lead to bearing operation instability, trajectory deviation from normal work, resulting in work early wear on the surface of bearing parts. The failure bearing axial ring channel edge wear, wear and compression, the edges of the channel section convex appear typical 'climbing' phenomenon, and shaft washer, seat ring and ball are not seen fatigue spalling, shows that the early stage of bearing fault performance should be wear and tear, the produce of wear and tear shall be the working process of the bearing in the unstable operation, steel ball and raceway contact position deviation from normal work path.