Stand or fall of FAG bearing lubricating oil analysis - bearing abnormal phenomenon

A: FAG bearing grease rheological: 1. When the grease is not affected by external force, can maintain a certain shape as solid, namely will not automatically when still lost. 2. Under high shear stress under the condition of ( Cutting speed a lot) , the flow of the grease like Newtonian fluid, the viscosity can maintain a constant, not change along with the change of shear velocity. 3. When the external force is weak, produce elastic deformation; Remove the external forces and to restore to its original position and shape, present a solid elastic properties. 4. When applied force is large enough, grease occur deformation and flow, and therefore can no longer be automatically restored to its original position and shape, so the grease in mechanical moving parts start torque is bigger than liquid lubricants. 2: FAG bearing grease defects: 1. Grease is semi-solid, room temperature does not flow, so the friction parts in fatliquoring or grease is difficult to change, FAG bearings cleaning is not very convenient. 2. Stir the resistance is bigger, therefore calorific value larger, cooling effect is poor. But should pay attention to some here, which have close relationship with lubrication method. Such as lubricating oil by complete immersion ( Or half immersed) Type of lubricating oil bath, with the power of small fat rather than oil consumption. Such as the British journal of friction and lubrication in 1973 6: with a diameter of 100 FAG rolling bearings, the speed of 1500 r/min, with grease lubrication, such instances are also a lot of domestic energy consumption, such as refractory plant of chongqing iron and steel company of refractory tunnel kiln of induced draft fan motor for power than using N68 lubricating oil, grease, FAG bearing temperature lowered 4 ~ 6 ° C. 3. Base oil is the carrier of additives and base oil failure additives will not play a role. 4. Due to mechanical action, FAG bearing configuration to fill in the lubricating base will gradually lose its lubrication performance. Therefore, the need to continuously add grease and updated. Of lubricant added time interval is FAG bearing formation, such as the size and speed and different, according to the running time of general interval to add grease. Large metal noise reason 1: abnormal load, countermeasures: correction, the bearing clearance, adjustment and load, fixed shell over the shoulder position. Reason 2: bad installation, countermeasures: machining precision of the axis, a hood, improvement of installation accuracy, installation method. Reason 3: lack of lubricant or doesn't fit, countermeasures: added lubricant, select the appropriate lubricant. Reason 4: rotating parts there is contact, countermeasures: modify the sealing contact part of the curved road. Rules reason 1: noise caused by foreign body rolling surface indentation, rust or scars, countermeasures: change the bearing, cleaning related parts, to improve the sealing device, use a clean lubricant. Reason 2: ( After carburizing steel) Surface deformation, countermeasures: change the FAG bearing, pay attention to their use. Reason 3: the raceway surface stripping, countermeasures: change the FAG bearings. Random noise reason 1: the clearance is too large, countermeasures: research cooperation and bearing clearance, load changes. Reason 2: foreign invasion, countermeasures: to study the change FAG bearing, cleaning related parts, to improve the sealing device, the use of clean lubricant. Reason 3: spherical injury, stripping, countermeasures: change the FAG bearings. Abnormal temperature rise reason 1: too much lubricant, countermeasures: reduce the lubricant, right amount used, select a hard grease. Reason 2: lack of lubricant or doesn't fit, countermeasures: added lubricant, select the appropriate lubricant. Reason 3: abnormal load, countermeasures: change to cooperate, the FAG bearing clearance, adjust the preload, modify the shell over the shoulder position. Reason 4: bad installation, countermeasures: improve the machining precision and installation accuracy of shaft and the shell, installation method. Reason 5: cooperate with the creep, seal friction is too large, countermeasures: change the FAG bearing, research cooperation, modify the shaft and the shell, change the sealing form. 1: (vibration reasons After carburizing steel) Surface deformation, countermeasures: note that FAG bearing replacement operation. Reason 2: stripping, countermeasures: change the bearing. Reason 3: bad installation, countermeasures: modify the axis, a hood over the shoulder Angle, pad side of the straight Angle. Reason 4: foreign invasion, countermeasures: change the FAG bearing, cleaning all parts, to improve the sealing device, etc.