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How to extend the service life of NSK bearings

Release time :2017-12-12read :248

The theoretical life of NSK bearings in centrifugal pumps is 20,000 to 80,000 hours, but the actual life depends on many factors - failure of premature NSK bearings can result in costly equipment downtime and sometimes even lead to More serious consequences. NKE (Austria) company's NSK bearings provide some simple but practical tips to optimize the performance of NSK bearings. 
Satisfactory service life of NSK Bearings began in the right NSK bearings choice. From the very beginning, NSK Bearings designers to extend the service life of NSK Bearings and equipment performance by choosing the right NSK bearings for different applications. This process to consider many factors, such as load, hardness, NSK bearings life prediction, operating environment and so on. 
Proper storage 
, in principle, all NSK bearings prior to installation should be kept in their original packaging. They need to be left in a clean, moisture-free, relatively constant-temperature environment. Rolling NSK bearings should be kept away from dust, water and corrosive chemicals. Shaking and vibration may permanently damage the mechanical properties of NSK bearings, so handling and storage process must avoid vibration. 
Basically, all NSK bearings must be kept horizontally because some of the heavier NSK bearings may be deformed due to their own weight after standing for a long period of time. 
Pre-greased (or sealed) NSK bearings require special care, because the grease after a long period of storage density will change. This is the first time NSK bearings used, there will be a certain degree of rotation noise. Therefore, the shelf time of this NSK bearings should be based on the principle of first in, first out to control. 
clean
Clean rolling bearings NSK is very important. NSK bearings ring rotating surface and the rolling element surface roughness is usually 1 / 10μm, so the smooth surface of the damage caused by pollutants are very sensitive. The lubricating layer between the rotating surfaces is usually 0.2 to 1 μm. Particulate contaminants larger than the particle size of the lubricant are subject to over-rolling by the rolling elements to create localized pressure in the NSK bearing steel, which eventually leads to permanent material fatigue. In addition to this, the dust particle size of the external environment up to 10 μm, NSK bearings will also cause damage. Therefore, clean and dust-free environment for NSK Bearings storage and installation is crucial. 
Fully prepared to install 
  NSK Bearings should be carefully installed and disassembled using the appropriate tools. Industry experts estimate that 16% of premature failure of NSK bearings is due to incorrect installation. For a large number of installations (for example in a production plant) the installation is usually strictly controlled and the installation can also be carried out with suitable NSK bearings. 
  However, the environment is varied in the maintenance or replacement work. Therefore, in order to ensure the longest life NSK Bearings, a comprehensive preparation for the installation of NSK bearings is necessary. 
  First of all, the relevant documents, such as drawings, maintenance manuals, product specifications, etc. need careful study. Next, all NSK bearings, such as shafts, spacer rings, caps, washers, etc. must be absolutely clean and free from contamination. The status of the adjacent components should also be carefully examined. 
  Careful installation and removal 
  according to the different application and size and type NSK Bearings import, select the appropriate mounting method (mechanical or hydraulic) and tools. Here are some basic principles of NSK bearings installation: 
  1. Do not exert force on the rolling element installation, which can easily lead to the rolling element and the raceway contact surface of the local overload, resulting in premature failure NSK Bearings. 
  2. Do not use any hard tools (such as hammers, screwdrivers, etc.) knocked directly on the surface of NSK bearings, which will lead to NSK Bearings ring fracture or fragmentation.