Research On Optimal Design Of Water Cooling System For Motorized Spindle

Machine tool errors mainly include geometric errors and thermal errors,with thermal errors accounting for over 70% of machine tool errors.Thermal errors of motorized spindles are the main source of thermal errors in machine tools.The temperature rise and thermal deformation caused by the heating of motorized spindles can seriously reduce the accuracy of motorized spindles.This article takes the AMS-120 high-speed motorized spindle as the research object,analyzes the thermal characteristics of the motorized spindle,proposes a cooling scheme for the water cooling system of the motorized spindle,establishes a temperature flow rate control model,conducts finite element simulation of the cooling process of the motorized spindle,optimizes the cooling parameters,and finally verifies the cooling effect of the water cooling system of the motorized spindle through cooling comparison experiments.The specific research content includes:1.A water cooling system design scheme for motorized spindle cooling has been proposed.Taking the motorized spindle as the cooling research object,based on the principles of heat transfer and CFD theory,the overall design of the motorized spindle water cooling system is carried out.A cooling method for the motorized spindle is proposed,and the mechanical structure and temperature control function of the water cooling system are designed to achieve differential cooling of different temperature fields of the motorized spindle.2.Studied the heating mechanism of the motorized spindle.Analyzed the heat source composition and heat transfer process of the motorized spindle,calculated the thermal load and heat transfer parameters of the motorized spindle,proposed a new temperature flow rate control equation based on previous research,and calculated the optimal refrigeration parameters under certain operating conditions,improving the calculation accuracy of the refrigeration parameters.3.A water cooling simulation model for the motorized spindle was established,and the simulation model was preprocessed.A simulation scheme was designed based on the comparative experimental method.The cooling process of the motorized spindle was simulated using Ansys Fluent,and the temperature change cloud map,deformation cloud map,and various experimental data of the motorized spindle before and after cooling were obtained.In the water cooling simulation experiment of the motorized spindle,temperature data and deformation data of key parts and structures were collected.By analyzing various cloud images and data before and after cooling,the cooling effects of different comparative experimental groups were obtained,and the optimal cooling parameters were verified to achieve the best cooling effect.4.Experimental verification.In order to further verify the cooling effect of the water cooling system,a cooling comparative experiment was conducted on the motorized spindle using the developed water cooling system.The experimental results showed that the error between the simulation experiment and the cooling experiment was within 7%,and the degree of agreement between the two was high,verifying the accuracy of the simulation results.By analyzing the data,it was found that before and after cooling,the maximum temperature of the stator of the motorized spindle motor decreased by about 60%,and the shaft shape variable decreased by about 70%.The motorized spindle cooling system achieved good cooling effect.