Opt, M X, Filtergram Figure 24 Opt, M X, Filtergram Because large spherical particles are the product of localized metal-to-metal contact and high frictional temperatures between rolling contact surfaces, their presence is often considered a supplementary or supporting symptom for assessing wear severity levels.
Wear Particle Oil and wear particle anlysis The copper alloy appeared yellow or reddish brown, while most other free metals appeared silver white. These indentations have irregular circumferences that correspond to the sizes of the solid particles that form them Figure 2, top. The case study covers a long condition-monitoring period, from to Removal of these particles usually causes a slight surface frosting without visible pitting or spalling.
Accordingly, the presence of chunky fatigue wear particles should be used as an important indicator of a bearing fatigue failure event.
The first is obviously its inability to differentiate between large wear particles and nonwear particles. Large spherical ferrous particles greater than 10 micron in rolling element bearings are believed not to be generated in the bearing fatigue cracks.
The material detached from these surfaces can be over-rolled into small plate-like particles platelets by passing through a region of rolling contact. In addition, the concentrations of microspall wear particles in both oil and grease samples are usually low compared to those of rubbing wear Figure 5.
Opt, M X, Filtergram Microspall fatigue wear particles are similar to rubbing wear particles in appearance. The case study covers a long condition-monitoring period, from to Figures 10 and 11 show individual laminar fatigue wear particles ranging between 50 micron and micron Figure 10 and micron and micron Figure In addition, the concentrations of microspall wear particles in both oil and grease samples are usually low compared to those of rubbing wear Figure 5.
There are a few test methods that can be used to determine the particle count in a sample. If your goal is to identify all possibilities of ingression hard and soft particles like those mentioned in the previous paragraph request the optical particle count method. Feel assured that we got your back.
Laminar particles are free metal particles, ranging from 50 micron to several hundreds of microns in their major dimensions with smooth flat surfaces and irregular contour. These large spherical particles can range from 50 micron to micron and often show signs of overheating and melting Figure Opt, M X, Filtergram Laminar Fatigue Particles Laminar particles are the most characteristic fatigue wear particles generated in rolling element bearings.
Particle counting has two major drawbacks when using it for wear debris detection. I appreciate that they do this without even asking me.
Despite these limitations, particle counting has proven to be highly effective at determining the onset of component wear. Laminar particles frequently have holes and folds along them, as shown in Figure 9.
The microspall particles that are generated this way are relatively small, ranging between 10 micron and 30 micron in their major dimension; however, their major dimension is sometimes as large as 50 micron. It was feasible to use atomic emissive spectrum and ferrography to monitor the working condition of the converter trunnion bearing.
Oil analysis was used to monitor the wear on this bearing. A bearing with deep spalling is usually recognized as a fatigue failure. This enables them to enter bearing interfaces and dent bearing surfaces, as illustrated in Figure 1.
Because of the correlation between fatigue wear deterioration and wear particle characteristics, several Rolling Fatigue Wear Severity Atlas Charts Chart 1 are included in this chapter. Vibration and oil analysis are two techniques used to monitor the condition of rotary machines. The subsurface cracking typically nucleates at material defects or inclusions in bearing steels.
Samples were taken before the oil was changed.
At its terminal point, surface fatigue causes significant surface spalling - large craters often several hundreds of microns across, which are easily visible to the naked eye. The microspall particles that are generated this way are relatively small, ranging between 10 micron and 30 micron in their major dimension; however, their major dimension is sometimes as large as 50 micron.
Opt, M X, Filtergram Laminar Fatigue Particles Laminar particles are the most characteristic fatigue wear particles generated in rolling element bearings. Many problems can be quickly and easily identified by monitoring the number and size-distribution of particles in an oil sample.
The risk for particle-induced surface fatigue is greatest when solid particles are roughly the same size as bearing dynamic clearances clearance size particles and are harder than bearing surfaces and not too friable.
Results The drive-side bearing on the No.
Click here to see table. It includes several photographs of damaged components, as well as photographs of wear particles before and after the bearing failure.OIL AND PARTICLE ANALYSIS. Technology Training that works Oil and Particle Analysis • Vibration analysis is an effective PM technique.
• Oil and Particle Analysis is maturing into another. Varnish Potential Analysis Varnish is an insoluble film that coats the internal components of machinery and can devastate production. Varnish deposits are sub-micron in nature and cannot accurately be measured using standard oil analysis tests.
Trico’s used oil analysis and lubricant analysis provides a variety of physical and chemical tests to assess oil/lubricant condition and its ability to perform, as required by the machine’s application.
Oil Analysis + Wear Particle What Size Particles Do the Most Harm? For many people, the key test to determine if there are damaging particles in the oil is to flied between their fingers or look at an oil.
Wear particle analysis is a powerful technique for non-intrusive examination of oil-wetted parts of a machine. The particles contained in the lubricant carry detailed and important information about the condition of the machine.
Ferrography is a wear particle analysis utilizing diagnostic and predictive techniques to evaluate the on-line condition of interacting lubricated or fluid powered parts or components.Download