ntn bearing heat knowledge and ntn bearing noise

1, ntn bearing heat knowledge
ntn bearing the core component, the spindle cell component usually μm-level precision, such as the beating is generally 1 ~ 3μm, spindle stiffness generally 100-300N/μm, therefore, spindle precision of the various parts and their deformation is small. However, the high-speed operation, the bearings much heat, resulting in a high bearing temperature rise and cause thermal deformation. The error caused by thermal deformation is much larger than the precision error and deformation.
Moreover, the thermal deformation of the bearing preload directly change the status, influence the stiffness characteristics of imported bearings and electric spindle of the machining accuracy, serious, or even lead to bearing thermal occlusion to spindle damage. Spindle reduces heat problems in the practical application of reliability. Therefore, the thermal analysis of the bearing and control the thermal characteristics of bearing spindle machining to improve the stability and reliability are extremely important. High-speed precision angular contact ball bearing spindle unit is the most widely used class bearings, bearing this paper to study such objects,
Imports of high-speed precision spindle bearing system made a more meaningful analysis and calculation of thermal characteristics.
Second, ntn bearing noise
Ntn roller bearings in the work operation to allow a slight noise, if noise is too large or unusual noise or crash, then showed that the bearing failure.
ntn roller bearings noise more complex reasons, one is bearing inner and outer rings with surface wear. Because of this wear and tear, damage the bearing and the shell, the bearings and shaft with the relationship, leading to axis deviation from the correct location in the shaft at high speed when the abnormal noise generated. When the bearing fatigue time, the surface of metal peeled off, it would generate abnormal noise bearing radial clearance increases. In addition, the lack of bearing lubrication, the formation of dry friction, and bearing such will have broken an unusual sound. ntn bearing wear Songkuang imports after the cage loose damage, also have abnormal sound.

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