Why don't your bearing always durable aging? Please note the following points

Bearing as an important part of a mining machinery is short, its use life being more and more attention. But in daily use, we can clearly see that under the same working conditions, bearing appearance model of differences, practical life is quite different. Why is this? Be careful the following! 01 with tight when bearing inner ring force into the shaft neck, light person will lead to severe wear at the bottom of the raceway of circular trajectory, the person that weigh in slide, there will be split on the outer ring and ball or peeling. Why ball with slide clearance is too small, increase torque, friction increases, bearing high operating temperature through, exacerbated bearing wear and fatigue failure. Avoid to restore bearing radial clearance, decrease interference. Bearing assembly quality inspection method has two kinds: visual observation: after the motor end cover bearing chamber with bearing, turn the end cover by hand, if the bearing rotation, sensitive, no vibration and swing up and down phenomenon, as a qualified. Feeler gauge method: put the bearing motor end cover assembly on the base check mouth, with 0. 3 mm thick feeler to check bearing radial clearance of the week, when benefits maximum clearance position just above the median ( Horizontal motor) , it is assembled correctly, reliable, otherwise, the device is bad. Should be appropriate to adjust the end cover position, repackaging, until qualified. 02 smooth bad reason is a serious shortage of smooth thin and fat or oil aging. Due to the high speed motor friction heat production, high bearing temperature through oxidation discoloration, show the bearing ball, insist on the rack, inner ring and shaft neck place such as brown or blue. Avoid way: on the basis of the running time of the motor, the environment temperature, load conditions, four elements such as smooth fat is good or bad, and its oil and oil change time. General situation, motor running 6000 ~ 10000 h should fill oil once; 10000 ~ 20000 h operation should be oil change, oil change quantity for the bearing chamber volume 1/2 ~ 2/3, and should adopt high quality smooth lithium base grease. 03 device if not for the device on, not only the bearing slide usu mark, uneven and ball bearing wear trace, also produce skewed, with a feeler check bearing radial clearance on either side of the range, and large difference. Reason may be directly with the iron hammer percussion bearing outer ring; Belt is pulled ( Gear wheels) Too tight; The driving wheel and driven wheel centerline is not parallel. When the deviation is greater than 1/1000, will form the bearing through the high running temperature, slide and ball bearing severe wear, shaft bending and end cover bolt clamping surface and bolt axis is not perpendicular. Correct installation method with flat end face lubrication, and the thickness of the bearing inner ring is equal to the steel pipe socket, put in a clean journal bearing pressure on the correct position. Pressure is fashionable force should be average, not too hard. Then according to the motor rotation speed check shaft end radial deflection of allowed value. 04 intense vibration when there was something wrong with motor who can make the bearing vibration. Why be dead heat deformation; Motor bearing aging; Shaft bending deformation; Loose end cover check mouth tighten bolts for vibration; Life not consolidate the bearing vibration. Avoid to be small, with 1052 for silicon steel sheet and silicone varnish appearance and opened the gap; Change is the new bearing; Be straightening out rotor shaft bending local; With 180 ° symmetric method; Tighten the cover through bolts; Reinforce the root, tighten the anchor bolts. 05 material fatigue due to metal materials and fatigue, bearing raceway and ball looks irregular fragments if mixed in smooth grease, it will make noise increases, its ball sliding condition, cause bearing radial clearance increases, and the deflection of shaft end allowed radial value increases 2 ~ 3 times. Bearing fatigue level resolution elements include: motor load, speed, air gap, end cover type, the material toughness, smooth quality of fat, fat smooth add quantity. Avoid method based on the motor running records, when light load current work for more than 60% of the rating, running to 2000 ~ 25000 h, medium load working current for rating of 60% ~ 80% to 15000 ~ 20000 h operation, heavy work load current rating of 80% ~ 100% to 10000 ~ 15000 h after operation, all should consider bearing data of normal tired, change is the new bearing. 06 pollution corrosion at this point, the raceway and the ball on the appearance of red, brown punctate, corrosion, compared with the new bearing noise work noise increases. Why assembly place is clean, such as presence of moisture, acid, alkali, and toxic gases; Hand tools and pollution; Use the smooth refers to the inferior quality. Avoid to bearing assembly shall insist on the environment, tools and hand clean; Clean the bearing thoroughly; A change in quality smooth lithium base grease.