Reason Analysis on Operating Side Bearing Burning for Work Roll on Aluminum Foil Mill(1)

2017/5/23 11:27:48

From 1550 aluminum foil mill work roll operation side bearing assembly drawing, you can see that the two columns of short cylindrical roller bearing bear radial load, axial load of single row four-point contact ball bearing, because of the bearing outer ring and leave enough space between the seat holes, make the bearing does not bear radial load, all adopt oil mist lubrication of the bearing.

The effect of the axial force

Usually four high rolling mill bearing two roll shaft line of the two work roll shaft with a plane in the plane don't overlap (except the reversible rolling mill), export direction of work roll shift distance, 1550 aluminum foil mill for 3 mm, this is through the arch window to ensure that the position relations. Operating side work by roll, the bending bearing plunger, axial damper and the frame of constraint, ideally, work roll on the axial force is small, which is about 0.5% ~ 1% of rolling force. Is generally thought that: the thickness of the rolled piece (cross section), the work roll and backup roll wear and work roll and backup roll matching tolerance and circular runout out-of-tolerance lead to roll rotation axis is not parallel, between work roll and backup roll bearing and the housing in the thermal equilibrium state clearance is too large when rolling is a major factor in the production of axial force. When roll crossing Angle of 0.05 °, the maximum axial force caused by up to 5% of the rolling force, serious more than maximum load bearing capacity, bearing damage.

underlubrication

Generally high temperature aluminum foil rolling mill for high-speed rolling, when produce heat, oil mist lubrication can evenly lubrication to the friction pair, combined with the specific heat is small, compressed air flow rate is high, easy to take away the friction heat, low fuel consumption, there is still a sealing function, and usually the aluminum foil rolling mill with oil mist lubrication. Oil mist lubrication bad, can cause bearing huge heat generated by the high speed rotates, ball bearing heat expansion, resulting in a decrease of the bearing clearance, to squeeze the bearing inner and outer ring, led to increasing ball bearing wear, enough bearing lubrication, fail to take bearing the heat generated by the high speed rotates, the final cause bearing lock, even cause fire rolling mill.