1200 positioning of cold rolling mill bearing abnormal damage problem summary

1200 abnormal location of cold rolling mill bearing damage problem summary - 2018 11 - 02 lei duan ( Rolling mill bearing) Foreword: in 1200 the six roller cold rolling plant positioning machine backup roll bearing of 351080 / HCP53 rolling element and cage periodic damage lock, the use of bearing and assembly work to bring inconvenience, and seriously often cause host four row cylindrical bearing damaged, causing great economic losses. Aiming at this problem, bearing manufacturers and technical personnel through to the bearing after testing, the indicators in the exclusion of bearing under the premise of their own reasons for the plant's bearing assembly site for tracking all the time, and the scene to participate in the installation, disassembly and maintenance, by tracking found following a series of related problems: one, bearing structure form 2, 1, supporting roller bearing damage form operation side lock nut damage occurred in a column, the corresponding side no frequent damage phenomenon, early damage phenomenon is roller large end face more wear and tear, high temperature corresponding to the inner ring. 2 late, damage phenomenon, roller large end face and the corresponding inner ring guard high temperature glue, cage damage fracture. 3, septum ring and the outer end face circumferential direction exists serious sliding wear and tear, and the baffle the chamfering worn metal burr and finely metal impurity. End of 4, main bearing guard and rolling element abnormal wear and tear. Three, four roll system assembly structure, the phenomenon analysis by looking at the above damage phenomenon and assembly structure stress analysis, concludes that the bearing by the lock nut side roller, abnormal under axial load leads to end with the corresponding inner ring roller rim abnormal transverse load, sliding friction, the friction caused tasikmalaya, roller cage damaged, eventually cause a complete set of bearing damage. Appeal image bearing wear, retaining ring in the outer ring end face wear and tear, can determine the positioning bearing gap existing in axial compression, then adjust gland 1 seam allowance, mat 1 slice were measured, the data is as follows: 1, remove the gaskets, separate the gland 1 for installation, when the pressure lid after living pressure by locating bearing outer ring end face, with a feeler gauge measuring clearance between gland 1 and 2, the measurement value is: 3. 2mm. Then measured have used rubber adjusting shim ( Flattening almost no adjustment of elastic gasket) Thickness: 3. 9 mm again to unused adjusting shim thickness measurement, the measurement value is: 4. 2 and 4 mm. 3mm。 By measuring the bearing end cover 1 after completion of the assembly, due to the gasket thickness can not be crushed to the thickness of the ideal, 3. 15 - 3. 2) Within the scope of led to about zero. 6 mm axial clearance. 2 and 2, the same way to measure gland main bearing axial clearance, found there is also a gland between 2 and bearing about 0. The axial clearance of 6 mm. Further analysis of the effects of the axial clearance of bearing operation: 1, 2 and gland main bearing axial clearance, is bound to cause gland 2 the center line of the cross, tilted relative roll and roller box. 2, after the center line of the cross, resulting in 351080 relative to the rolling element bearing outer race and inner ring tilt, when the axial force near the lock nut ( When axial force to drive side direction role) After a list of rolling body, an axial overload and beating, lead to bearing damage. After 3, the same inside and outside the circle of sloping, bearing at high speed, cause keep beating, cage and wear and tear, vibration roller, caused cage craze, rolling body tasikmalaya, cause bearing burning to death. 4, lead to the main bearing penal swimming deflection during operation, cause abnormal capillary and guard ends roller wear. Five, the corrective adjustment bearing assemblies: 1, the existing random matching rubber gaskets, gasket replacement for adjustable rigidity. 2, every time assembly must be measured depth, according to the measured data matching adjustment, make sure that the main bearing and axial pressure on reasonable locating bearing. 3, regular adjustment of 351080 A/B bearing surface of bearing, wear on both sides of the synchronization. Every circle in the bearing measurements, the wear serious inform replace bearing manufacturer, guarantee the bearing axial clearance is reasonable.