The backing bearings ( Jimmy's bearing)

Due to market the appearance quality of cold rolled products, thickness tolerance, war plane degree request progress from time to time, especially the plate and strip request more strict. Send the mill equipment from two roll to roll ( Eight roller, twelve roller, 18 roller, roller, 20 36 roll) Carried out so that can be rolled out the thickness is thinner, tolerance smaller and looks better quality products. Put forward higher request to bearing especially backup roll bearing. And backing bearings is recognized worldwide as the preferred more mill of backup roll bearing, this requests the backing bearings with high precision. Features: it was not acceptable larger radial load when running accuracy level is superior to the p4 level when bearing outside diameter using thecountry. Do not directly as the roll surface, can repair device features: does inner ring and the shaft for the loose fit when every 3 to 7 for a group, to gear to the shaft does each group set way bearing has a sizable number, device not upset when bearing inner ring when the maximum thickness of symbol device when all bearing inner ring must be in the same position assembly precision: the accuracy of bearing its own request is very high, especially eliminate radial clearance after the inner to the outer diameter of cross section height ( T value) Especially important, on each axis, control the adjacent bearing T value are 0. Less than 002 mm, entire group control in 0. Within 005 mm ( Figure B - 3) 。 Smooth, smooth effect is good or bad, directly about bearing use lifespan. Smooth and smooth effect is good or bad in addition to the agent's own performance and smooth way, smooth structure design is the main factor of bearing, the number of the oil hole, size, location, directly affect the smooth effect, backing bearings design should be confirmed before the smooth agent performance and smooth way. Backing bearings three smooth way when rolling emulsion is the most economical way to smooth, smooth without sealed backing bearings use the more smooth way, demand of large flow smooth emulsion reached quickly after bearing the internal cooling effect. When circulating oil smooth smooth main backing bearings with a lip seal, smooth flow of bearing internal heat can be taken away, and then to smooth the oil base station cooling cycle. Can use high viscosity smooth agent, make the bearing life relatively smooth and emulsion has great progress. Have the backing of oil and gas main smooth with smooth lip seal bearing, application of clean dry contraction breathed air will smooth the oil bearing, bearing internal pressure, smooth agent adhesion to the bearing surface, and to avoid the invasion of alien invaders, its smooth capital is high, but the ideal smooth effect. Maintenance and repair: as the backing bearing assembly on how the backup roll mill, roll the spread of different location must stress, this creates a bearing level of wear and tear, backing bearings after using 2 cycles, it should be on supporting roller bearing of the bearing and bearing lower support roller bearing stop position swaps, each cycle to the rotation of the inner ring stop 90 °, so can make the persistence of the bearing wear as much as possible. Due to mill rolling material request is higher, after a certain period, due to the bearing wear, all aspects of accuracy is reduced, when cannot satisfy rolling material request, need to bearing stop regrinding, restore precision. , ring and rolling body has no obvious pitting and spalling trend before, only need grinding outer ring ( Because of special heat treatment process, outer ring is grinding times adhere to the hardness of differences with the original) Appearance can restore bearing accuracy. On outer ring, rolling body loss, severe spalling and inner ring pitting or peeling off the whole rent backing bearings, new system needs to stop parts and regrouping, stop to repair. DMD in multi-roll mill backing bearing manufacture and repair category has a rich technical experience, detailed technical data, please consult the dmo department.