Some common problems when using the bearing installation

   1. The use of bearings should note the following:
A, to keep the bearing and its surrounding environment clean, even if the invisible tiny dust into the bearing, will increase the bearing wear, vibration and noise.
B, the use of the installation to be careful, do not allow strong stamping, do not allow the hammer directly hit the bearing, does not allow the transfer of pressure through the rolling body.
C, the use of appropriate and accurate installation tools, try to use special tools, try to avoid the use of cloth and short fibers and the like.
D, to prevent the corrosion of the bearing, directly by hand to take the bearings, to fully wash away the sweat on hand, and coated with high-quality mineral oil and then operate in the rainy season and summer, especially pay attention to rust.
   2. Roller bearing installation is a common problem
  2.1 on the installation of the surface and installation requirements?
Yes. If the bearing has iron, burrs, dust and other foreign objects into the bearing will run in the noise and vibration, and even damage the raceway and rolling body. Therefore, before installing the bearings, you must ensure that the installation surface and installation environment are clean.
  2.2 Should the bearings be cleaned before installation?
Bearing surface coated with anti-rust oil, you must use clean gasoline or kerosene carefully cleaned, and then coated with clean high-quality or high-speed high-temperature grease can be installed to use. The effect of cleanliness on bearing life and vibration noise is very large. But we have to remind you that: all closed bearings do not need to clean refueling.
  2.3 How to choose grease?
Lubrication has a very important bearing on the operation and life of the bearing. Here you will briefly introduce the general principles of choice of grease. Greases are made from base oils, thickeners and additives. The grease properties of different grades and grades of the same type vary greatly and the permissible rotary limits are different and must be noted when selecting them. The performance of the grease is mainly determined by the base oil. Generally low viscosity base oil for low temperature, high speed; high viscosity for high temperature, high load. The thickener also relates to the lubricating properties, and the water resistance of the thickener determines the water resistance of the grease. In principle, brands of different grease can not be mixed, and even the same thickener grease, but also because of different additives to bring a bad impact.
  2.4 in the lubrication of bearings, the more oil the better?
Lubrication of bearings, the more oil the better, this is a common concept of error. Bearing and bearing the room too much grease will cause excessive agitation of grease, resulting in a very high temperature.
  2.5 how to install and disassemble?
Do not directly hammer the bearing end and non-stressed surface of the installation, should be briquettes, sleeves or other installation tools to make the bearing even force. If the installation surface coated with lubricating oil, will make the installation more smoothly. Such as with a larger interference, the bearing should be placed in mineral oil heated to 90 ~ 100 ℃ immediately after installation. In the event of difficulty in demolition, it is recommended that you use the removal tool to pull out the same time to the inner ring carefully pouring hot oil, heat will make the bearing inner ring expansion, so that it easier to fall off.
  2.6 bearing the radial clearance of the smaller the better?
Not all bearings require the smallest working clearance, you must choose the appropriate clearance according to the conditions. In the national standard 4604-93, the radial clearance of the rolling bearing is divided into five groups - 2 groups, 0 group, 3 groups, 4 groups and 5 groups. The clearance value is from small to large, and the group 0 is the standard clearance. The basic radial clearance group is suitable for general operating conditions, conventional temperature and commonly used interference fit; in high temperature, high speed, low noise, low friction and other special conditions of the bearings should use large radial clearance; Precision spindle, machine tool spindle bearings should use a smaller radial clearance; for roller bearings can maintain a small amount of work clearance. In addition, the separation of the bearings do not matter the clearance; Finally, the bearing installed after the work of the clearance, than the original clearance before the installation of small, because the bearing to bear a certain load rotation, as well as bearing with the load and the resulting Elastic deformation.