NSK bearing vibration and temperature judgment damage degree

The current stage involves multiple phases of bearing degradation, making it crucial for us to identify and assess the damage accurately. Today, I’ll explain how to evaluate NSK bearing damage using vibration and temperature monitoring. First, let’s talk about **bearing vibration**. Vibration is one of the most sensitive indicators of early-stage bearing issues. Problems like flaking, dents, rust, cracks, or wear can all be detected through vibration analysis. To measure this, we use specialized equipment such as frequency analyzers or vibration meters. However, the frequency readings alone may not directly indicate the type of fault—this depends on the specific condition of the bearing. The measured values can vary based on factors like operating conditions and sensor placement. That’s why it’s essential to establish a baseline by analyzing and comparing data from each machine beforehand. This helps in setting accurate thresholds for identifying abnormal behavior. Next, **bearing temperature** is another critical parameter. Normally, the temperature outside the bearing is used as an estimate. If possible, measuring the outer ring temperature directly through the oil hole is more precise. As the bearing starts running, the temperature usually rises gradually and stabilizes after 1–2 hours. The normal operating temperature varies depending on the machine's heat capacity, cooling system, speed, and load. If the lubrication or installation is improper, the temperature might spike suddenly, leading to overheating. In such cases, immediate action is necessary to prevent further damage. Thermal sensors are commonly used to monitor bearing temperature in real-time. These systems can trigger alarms or even shut down the machine if the temperature exceeds safe limits, helping to avoid serious failures like seized shafts. High temperatures are often a sign of underlying problems. They can also degrade the lubricant, reducing its effectiveness. Prolonged operation above 125°C can significantly shorten the bearing’s lifespan. Common causes of overheating include insufficient or excessive lubrication, contaminated grease, overloading, mechanical damage, incorrect clearance, or friction from faulty seals. Therefore, continuous temperature monitoring is vital. Whether you’re measuring the bearing directly or checking other critical components, any unusual change in temperature could signal a developing issue. Regular temperature checks can be done using tools like the SKF digital thermometer, which provides accurate readings in Celsius or Fahrenheit. Given the importance of bearings in machinery, any failure can lead to costly downtime. It’s wise to install temperature sensors specifically for these components. After lubrication or relubrication, a slight temperature increase is normal and should last only a day or two. But persistent or sudden spikes must be investigated promptly to prevent major breakdowns.

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