The current stage is the multi-stage of bearing damage, so it's crucial for us to identify and assess the condition of the bearing. Today, I'll explain how to detect bearing damage by analyzing vibration and temperature in NSK bearings.
First, let's talk about vibration. Bearing vibration is a highly sensitive indicator of early-stage damage. Issues like pitting, scoring, rust, cracks, wear, or misalignment can all be detected through vibration analysis. To measure this, we use specialized equipment such as frequency analyzers or vibration meters. However, the frequency values alone cannot always indicate the exact type of fault—each machine has its own baseline. Therefore, it's important to establish a reference standard by comparing measurements from similar machines under normal conditions.
Second, temperature monitoring is equally important. The temperature of a bearing is usually measured externally, but if possible, measuring the outer ring directly via an oil hole provides more accurate results. Normally, the bearing temperature rises gradually during operation and stabilizes after 1–2 hours. The normal operating temperature depends on factors like machine design, speed, load, and lubrication. If the temperature increases rapidly or exceeds expected levels, it could signal a problem such as poor lubrication, misalignment, or internal damage. In such cases, it's essential to stop the machine and investigate immediately.
Thermal sensors are often used to continuously monitor bearing temperatures. These systems can automatically trigger alarms or shut down the machine if the temperature goes beyond safe limits, preventing serious failures like seized shafts. High temperatures not only indicate abnormal conditions but also degrade the lubricant, reducing the bearing’s lifespan. Prolonged exposure to temperatures above 125°C can significantly shorten the life of imported bearings. Common causes of overheating include insufficient or excessive lubrication, contaminated grease, overloading, internal damage, improper clearance, or friction from oil seals.
Therefore, continuous temperature monitoring is vital. Whether using a thermometer like an SKF digital device or installing a dedicated temperature sensor, regular checks help detect anomalies early. Even small temperature changes under consistent operating conditions can signal developing issues.
In summary, vibration and temperature monitoring are two of the most effective methods for identifying bearing damage. By combining these techniques with routine inspections, you can prevent unexpected failures and extend the life of your machinery.
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