Thermal Characterisation and Cooling Optimisation Modeling of Motorised Spindles Baesd on Thermal Network Heat Transfer Models

As an essential equipment for high-speed precision machining, the motorised spindle is usually widely used in CNC machine tools and machining centres. However, due to its compact structure, the heat dissipation ability is lacking, which makes the internal temperature of the motorised spindle rise and produce thermal expansion. To further improve the heat dissipation ability of the spindle, it is necessary to further study the thermal characteristics of the spindle and the coolant flow prediction algorithm based on simulation data. This paper mainly establishes the thermal network heat transfer model and coolant heat transfer model of the motorised spindle, carries out the flow-heat-solid coupling simulation of the thermal characteristics of the motorised spindle, and solves the temperature value of each node, and collects the temperature and thermal deformation data under different rotational speeds of the motorised spindle, and compares with the results obtained from the simulation, the temperature error is no more than 15%, the mistake in thermal deformation is no more than 7%. A coolant flow optimisation model is established, and the particle swarm algorithm is obtained to be more suitable for predicting cooling flow in closed-loop feedback control.