How to check the fault of the running bearing and how to deal with it



Today, we will discuss how to check the rolling sound, vibration, temperature and lubrication status of imported bearings during operation so as to find and solve problems in time to avoid unnecessary economic losses.

Today is mainly to check the rolling sound, vibration and temperature of the imported bearings. We will explain this in more detail in future articles.

The first is to identify and check according to the sound of the rolling of the imported bearings. We can use the sounder to check the size and sound quality of the rolling sound of the imported bearings in operation. Because the imported bearings emit abnormal noises and irregular sounds even if they are slightly peeled off, they can be distinguished by the sounder, which can prevent them in advance.

Secondly, the vibration of the imported bearing in the work to identify and inspect, the vibration of the imported bearing is very sensitive to the damage of the bearing. For example, peeling, indentation, rust, cracks, abrasion, etc. are reflected in the vibration measurement of the imported bearing. Therefore, the vibration can be measured by using a special imported bearing vibration measuring device (frequency analyzer, etc.). It is not possible to deduce the specific circumstances of the anomaly. The measured values ​​vary depending on the conditions of use of the bearing or the mounting position of the sensor. Therefore, it is necessary to analyze and compare the measured values ​​of each machine in advance to determine the judgment standard.

Finally, it is checked according to the temperature of the imported bearing. The temperature of the imported bearing is generally estimated based on the temperature of the outdoor surface of the imported bearing. If the oil hole can directly measure the temperature of the bearing outer ring, it is more suitable.

Usually, the temperature of the imported bearing rises slowly as the operation starts, and reaches a steady state after 1-2 hours. The normal temperature of the imported bearings varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are suitable, the bearing temperature will rise sharply and abnormal temperature will occur. At this time, it is necessary to stop the operation and take necessary precautions. Based on a large amount of test data, Table 4-1 lists the average value of the outer ring temperature when the bearings are working in various machines for reference. Since the temperature is affected by lubrication, speed, load, and environment, the values ​​in the table only indicate the approximate temperature range. The thermal sensor can be used to monitor the working temperature of the bearing at any time, and automatically alarm the household when the temperature exceeds the specified value or stop the occurrence of the burning shaft accident.
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What are the main properties of spindle bearing oil, and what is the role?



Spindle bearing oil is a special lubricant for spindle bearings of precision machine tools and similar equipment. It plays an important role in ensuring the working accuracy and performance of the spindle and prolonging its service life. It is also called bearing oil.

Its main performance:

1. Suitable viscosity and good viscosity temperature characteristics

In order to make the machine tool spindle temperature not too high, the machine tool will be thermally deformed, affecting the machining accuracy or making the bearing poorly lubricated. The lubricating oil of the appropriate temperature should be selected according to the spindle bearing structure, the rotating speed and the bearing clearance, and it is required to have good viscosity-temperature characteristics. To prevent the change in viscosity due to excessive changes in the operating temperature of the spindle and the ambient temperature, which affects the lubrication performance.

2. Good lubricity

In order to maintain a uniform oil film between the main shaft and the bearing contact surface, and the impact film is not damaged when the spindle starts or stops moving, maintaining good lubrication performance reduces friction and friction heat, reduces spindle temperature rise, and ensures The effect of processing accuracy requires good lubrication performance.

3. Good oxidation resistance

When the machine tool spindle adopts the circulating lubrication method, the spindle bearing oil is required to be used for a long time without deterioration, so it is required to have good oxidation resistance.

4. Good rust resistance

Since the oil is inevitably mixed into the condensed water in the air or the machine coolant during the operation of the spindle lubrication system, the oil is required to have good rust resistance.
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