To reveal the temperature field in spindle system

the conduction and convection thermal resistance model including spindle

bearings

sleeve

bearing cap was constructed. The heat balance equations for hot nodes were analyzed and solved to gain the temperature field in spindle system with Newton-Raphson method.The influences of the bearing preload

spindle rotational speed and lubricant viscosity

on the key node temperature were also discussed. The results of numerical simulation and experiments demonstrate that under some conditions

the spindle system temperature distributes quite differently. The higher the bearing preload and the spindle speed

the higher temperature gets in the bearing; the greater the initial bearing contact angle

the lower the temperature.The influence of lubricant for the temperature distribution in bearings at high speed is more evident. Setting the initial bearing clearance and adjusting bearing preload facilitate controlling the spindle system temperature field.It can effectively avoid the failure of inside and outside ringscaused by the high temperature

so the service performance of the rolling bearing can be improved.