About 16% of the case in all-aligning roller bearings premature failure due to installation caused by improper or incorrect installation. A variety of different applications may require mechanical, to properly heat or hydraulic means and efficiently mounted bearings. Select the appropriate application installation method will help you to extend the the fag bearing life and reduce premature bearing failure and potential damage caused by the cost of application.
1, improper assembly
Assembling or disassembling the drive shaft bearings, bushings, basically mechanical percussion. This method to install self-aligning roller bearings, if uneven force, excessive force, inappropriate or improper assembly point in the center of the force, in the bearing housing and drive shaft bearings are easy to make incorrect position, causing the bearings installed after already must potential quality problems. Improper assembly at the same time, resulting in the transmission system on the lower bearing Shouli Bu force large bearing easily damaged in advance.
2, improper lubrication
During use, improper lubrication of the main manifestations and their causes:
The drive shaft (or sleeve) and there is relative movement of the upper bearing of the lower seal, ① grease Joined not sufficient. Mills use no plansifter specification requirements on time, according to the amount of added grease, no open plansifter Spherical the exhaust plug cover roller bearings, plus people grease with a grease gun, only to supplement it very little grease, inadequate bearing lubrication. ② grease added too much. This is mainly for grease plus more bearing possible misconceptions. Adding an excess of grease within the bearing cavity and bearing will cause cooling difficulties, bearing temperature rise accelerated, premature bearing failure. The ③ grease caused by dry friction between the outer ring and cage bearing ball bearing. This mainly occurs in the plansifter the upper bearing. The continuous operation of the process, would not achieve the sealing grease on the bearing cavity along the drive shaft (or sleeve) flows downward, causing the bearing cavity without grease and dry friction, exacerbated by the premature failure of the bearing.
3, pollution
That contaminants (foreign) invasion Spherical roller bearings the cavity or grease, causing premature failure of bearing deterioration of the operating environment, can not be effectively run. The bearings are precision parts, if the bearings or grease contamination, the bearings will not be able to run effectively. Plansifter drive shaft bearing in the production and assembly process, the assembly environment, assembly bearings or likely to cause varying degrees of bearings and grease to bearings plus people grease, pollution, on the other hand, plansifter during operation poor sealing of the various components (top grid, the material base plate, sieve the door and sieve box sealed well), out powder leakage, dusting flour particles, dust and other contaminants invaded bearing cavity, likely to cause the bearing operating environment by pollution, the bearing can not be effectively run, and premature failure.
4 fatigue
As its ultra-design production run, plansifter turning circle, machinery and equipment overload on the need to increase and the use of, or improper maintenance, self-aligning roller bearings will be affected, leading to premature bearing fatigue and premature failure. If its drive shaft bearing two mounting holes in the manufacture of high-side plansifter process heart concentricity difference between the larger, self-aligning bearing adjustment amount can not compensate for the deviation, the plansifter during operation, on, the two bearings may be in abnormal overload state. Also in the installation, commissioning plansifter process, did not find the drive shaft plumb position, resulting in lower bearing is not normal overload state run. Furthermore, general mills running to be super its design capacity, and to improve economic efficiency, to recover the cost of investment, but caused milling equipment overload. Plansifter no exception, in order to increase production, improve the screening management efficiency, resulting in plansifter overload operation, the upper and lower bearings in overload running state. These situations will cause the plansifter bearing premature fatigue failure in advance.
5, other reasons
Other causes self-aligning roller bearings proportion bearings poor quality and poor quality of the housing bore machining, bearings and grease contamination, bearing the overload fatigue and other reasons (bearing bore quality, accounting plansifter drive shaft bearing premature failure The premature failure about 5% of the total.



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