Thermal resistance network for solving temperature field in spindle system

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 rings caused by the high temperature, so the service performance of the rolling bearing can be improved.