다울빛 이주여성 연합회

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Bella2021.06.25 16:36
Click here for more details about FAG NU2352EX.M1 bearing

For convenience, boundary friction and mixed friction are collectively referred to as non-liquid friction hereinafter. The sliding bearing is in the most ideal state of liquid friction. Because the friction resistance at this time is small, the friction factor is close to the equivalent friction factor of the rolling bearing. In addition, the bearing oil film can completely eliminate wear and tear, and at the same time has good vibration absorption, cushioning and other advantages. But when the sliding bearing is in the boundary friction state, if the boundary oil film is destroyed, the friction and wear between the metals (the first is the abrasive wear) will increase sharply. At the same time, the local temperature caused by metal-to-metal friction increases sharply. The increase in temperature leads to rapid expansion of the metal surface, which in turn intensifies the friction between metals. When the local high temperature generated by friction reaches the melting point of the material, adhesion will occur between the main shaft and the bearing, that is, shaft holding.

The material of the plain grinding sliding bearing is tin bronze. When the shaft is held slightly, there are black burn marks on the surface of the main shaft. The sliding bearing is a copper-based alloy material, which is relatively soft. In addition to black burn marks, pits will also be formed on the burned surface. In this case, you should first analyze the cause of the shaft holding, eliminate the fault, repair the surface of the main shaft and the sliding bearing, and re-scrape and assemble. The main shaft and sliding bearings can still be used. Severe holding of the shaft will cause the main shaft to crack, in which case the main shaft should be replaced.
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