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Talking about "What should be paid attention to when NSK bearing device"
**Talking About "What to Pay Attention to When Installing NSK Bearings"**
Home > Bearing Knowledge > Talking About "What to Pay Attention to When Installing NSK Bearings"
Source: Bearing Network | Time: June 24, 2013
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When working with NSK bearings, proper installation and maintenance are essential to ensure their performance and longevity. Whether you're replacing a bearing or installing a new one, following the right procedures is crucial. Here are some key points to consider when handling NSK bearings.
First, when removing a large number of NSK bearings, it's important to use hot oil at a temperature between 90-100°C to melt the old grease. Avoid using sharp objects to dig out the old oil—instead, rinse the bearing for a few minutes. Then, clean it with kerosene and finish with gasoline. After cleaning, make sure to dry the bearing on a clean cloth or paper to prevent any moisture from remaining.
Before installing an NSK bearing, it’s vital to check the dimensions, shape accuracy, and surface finish of the shaft and housing. These factors directly affect how well the bearing will fit and function. Additionally, always inspect the bearing packaging before opening it. Soak the bearing in gasoline or similar solvents and gently rotate it to remove any old lubricant and ensure the raceway surfaces are clean.
The installation area should be cleaned thoroughly using a solution of gasoline, kerosene, toluene, or xylene. Wipe the surface with a clean cloth and apply a thin layer of lubricant to make the installation process smoother and more efficient.
Keep in mind that sealed NSK bearings should not be disassembled using this method. The seal must remain intact, as removing it can compromise the bearing’s protection against contaminants.
Any imperfections on the shaft or housing bore, such as burrs, rust, or dirt, can cause installation difficulties and even damage the bearing during operation. These particles can act like abrasives, leading to wear or scratches on the bearing’s outer surface. Therefore, it's essential to carefully inspect and clean these areas before installation. Use tools like oil stones to remove burrs, fine sandpaper to smooth rough spots, and wipe away any foreign particles.
There are several methods for installing NSK bearings depending on their size and type:
1. **Using a Copper Rod**: This is a common method for smaller to medium-sized bearings. If the inner ring is tightly fitted while the outer ring is loose, place the copper rod against the inner ring and tap it gently with a hammer. This distributes the force evenly and helps seat the bearing properly on the shaft. For larger bearings, tap around the inner ring evenly to avoid uneven pressure.
2. **Using a Sleeve**: Similar to the copper rod method, a sleeve made of soft metal (such as copper or low-carbon steel) can be used to press the bearing onto the shaft or into the housing. This method ensures even distribution of force and reduces the risk of damaging the bearing. The sleeve should be sized appropriately based on whether the bearing is being mounted on a shaft or in a housing.
3. **Using a Press**: For heavy-duty or large bearings, a hydraulic press is often the best option. The force should be applied directly to the end face of the bearing that has interference fit. Applying pressure to the wrong part may cause damage to the bearing’s outer surface.
4. **Heating Method**: For bearings with a tight fit, heating the bearing using a fuel tank or induction heater can help expand it slightly, making installation easier. The temperature should generally be kept below 100°C, ideally between 80-90°C. Excessive heat can lead to annealing of the bearing rings and rolling elements, reducing hardness and wear resistance, which ultimately shortens the bearing's lifespan.
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This article was originally published on China Bearing Network.
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