Detailed introduction bearing cold and heat installation steps

Bearing is commonly used in rotating machinery and equipment parts, bearing quality directly affect the normal and efficiency of the equipment operation, install bearing in use is due to improper operation will greatly affect the service life of the bearing, bearing, the method of installation installed common cold and heat, the two installation method of the correct operation method, steps you know? When installing bearings, ought to according to the type and size, select machinery, such as heating or hydraulic method. Outfit bearing should be carried out in a dry, dust-free area, and should be far away from equipment can produce metal debris and dust. When must be installed in a complex environment, should reduce the pollution. One hot, installation; Normally, for larger bearing installation, not by heating the bearing or bearing is impossible, because with the increase of the size, the greater the force needed for the installation. Heat installation needed between the bearing ring and the shaft or housing, the interference temperature mainly depends on the quantity and the diameter of the bearing fit place. Open type bearing heating temperature shall not exceed 120 ℃. Bearings with seals and dust cover is not recommended be heated to above 80 ℃ ( Shall ensure that the temperature does not exceed the seals and the allowed temperature grease) 。 Bearing heating, uniform heating, never can have local overheating. Second, the cylindrical hole bearing cold installation; Cooperate with not too tight little bearing installation, can be through a sleeve with hammering method, tapping the sleeve bearing is put into place. Should as far as possible even when knock the effect on the bearing ring, in order to prevent the bearing tilt or skewed. Most of the bearing pressure into the method for installation. If you would have a bearing inner and outer ring loaded on the shaft and bearing seat at the same time, must ensure that the same pressure effect on the outer ring, at the same time, and must be installed with the tool interface on the same plane. Three bearing, bearing induction heater with cone hole, its most circle in the form of an interference fit to install. Interference amount is made up of inner ring in cone diameter of axle, set set, or withdrawal of the axial forward distance on the decision. On the cone with the advance of the greater the distance, the radial internal clearance of bearing more xiaoke, by measuring the clearance reduction is or axial forward distance to determine the amount of interference. Small and medium-sized bearings can make use of the bearing installation tools or had better lock nut out inner ring to the proper position of the cone diameter of axle. In the use of set set of circumstances, can be used with the hook spanner or impact wrench locking sleeve nut. To return a sleeve bearing installation tools available or end plate pushes it into the bearing inner hole. Larger bearings need more force to install, so you should use the hydraulic nut. Four, bearing installation common errors include: 1, the hammer percussion bearing directly: install inner ring ( Or outer ring) Interference fit of the bearing and banned direct percussion hammer bearing inner ring ( Or outer ring) End face, it's so easy to guard the bad. Should use socket on inner ring ( Or outer ring) End face, with a hammer percussion sleeve to install. 2, the heating temperature is too high, some users with acetylene torch to heating of bearing inner hole, when the temperature exceeds 727 ℃, The phase transition temperature of bearing steel) When the inside of the bearing steel microstructure changes will occur. After the bearing cooling, bearing inner hole will not be able to restore to its original size, usually is bigger than the size of the before heating. 3, go outside: shell holes and bearing outside diameter with too loose, Commonly known as & other; Go outside & throughout; ) , due to shell the matching of the aperture and the choice of bearing outside diameter is too loose, sliding surface between them. Sliding friction will cause fever, heating and bearing damage. Shell holes and between the trace of sliding surface of bearing outside diameter 4, inner ring, shaft and bearing inner hole with too loose, Commonly known as & other; Go throughout inner ring &; ) Due to the matching of the shaft and the choice of inner hole is too loose, sliding between the shaft and the inner hole surface. Sliding friction will cause fever, bearing damage due to heat. Between shaft and hole surface sliding trace, inner ring end face and shoulder friction heat crack, when & other; Go throughout inner ring &; When the sliding friction between inner ring and the shaft will produce high temperature, due to the inner ring end face and shoulder interface is very small, its temperature will be higher. Make inner ring end face to produce hot crack and thermal crack extending unceasingly, makes the bearing inner ring fracture in use. Between shaft and hole surface adhesion after fever, because & other; Go throughout inner ring &; Produce sliding friction between the inner hole and shaft surface, caused by high temperature melt metal surface and adhesion.