Miniature bearing fault diagnosis of practical technology

As mentioned before, for a single, ring rolling roller channel frequency, for shaft rotating frequency, rotational frequency of/to keep the frame, The revolution of the rolling element frequency) ，/。 To the rotation of body to maintain frame frequency ( Roller rotation frequency) 。 Following a brief introduction of the vibration machine in FIG. 3 8, corrugated, in the manufacturing process of bearing inner ball number Z = 8, inside the circle, as the inner ring of corrugated peak number of n2 - respectively 1, n2, nz + 1, the external ring radial vibration influence as follows a wave of k + 1 is the peak of the ball on the top of the chart discussed in the with wave after the m - When a wave. When the wave crest is n2, outer ring in figure 3 - radial Within eight laps ripple rate caused by outer ring radial movement, but the ball with nZ1 wave vibration mechanism of the wave number ( n＝1，Z＝8) Surface contact, the outer ring has the most too displacement in upward direction. In another case, when the figure the most at the top of the ball in contact with the wave trough, wave number for nZ, outer ring, no radial displacement; When nZ1 wave Numbers, outer circle have the largest displacement in the downward direction. This can explain the wave number is equal to the causes of vibration nZ1. Of course, must show, table 3 - 2 the conclusion is that under the condition of fully ideal, namely the ripple is evenly distributed, and the shape of corrugated approximate sine curve. And in actual corrugated is not the case, it may delay there will be other frequency components. Figure 3 - 9 is used in the machine tool with two of the ultra-precision pretightening centripetal ball bearings due to raceway waviness when axis swing track. The axis trajectory figure in roll or revolute. Some outside, not only bearing fluid and dynamic body of waviness will cause bearing, according to the dynamic bearing internal and external coordination with the face, neck, and the bearing hole of waviness on precision bearing can also cause a similar vibration, because the cause of deformation after the bearing assembly. ( 2) As shown in figure 3 - caused by eccentric bearing vibration 10, when bearing clearance is too large or roll eccentricity will cause the bearing vibration, the vibration frequency of C ( k＝1，2，…) , f axis rotation frequency.