Thermal Characteristic Analysis And Cooling System Optimization Design Of The High-speed Motorized Spindle

The high-speed motorized spindle is a complex electromechanical dynamic coupling system,which integrates transmission,execution,and control functions.It can realize high-speed and high-efficiency operation,promote the development of the manufacturing industry,and become an essential core component of high-end CNC machine tools.Due to the compact spatial structure of the motorized spindle,when the speed and transmission efficiency are increased,the internal heat of the spindle cannot be timely distributed to the external environment,resulting in thermal deformation.At present,the heating problem of the motorized spindle has become the bottleneck to improving the machining accuracy of the spindle.It is of vital significance to analyze the thermal characteristics of high-speed motorized spindle systems and study the related cooling system.This paper will focus on the practical problems of the C01.10 high-speed motorized spindle of Ningbo Tian-Kong Five-axis Technology Co.,LTD carrying out relevant research work.First of all,the technical index of this motorized spindle is proposed,and its key structure is selected and designed.On this basis,the internal heat generation and heat transfer mechanism are analyzed according to the theory of electrical machinery,bearing friction heat generation,and heat transfer principle,which provides a theoretical basis for subsequent analysis.Secondly,three-dimensional modeling and finite element analysis software were used to complete the fluid-thermo-solid coupling simulation analysis of the motorized spindle.The temperature field distribution,thermal deformation rule,and reliability of the T-shaped cooling system of this motorized spindle at the same speed and under different cooling conditions were analyzed.The cooling experiment platform was built to conduct the thermal characteristics experiment of multiple groups of the motorized spindle.The temperature rise and thermal deformation data of the spindle under different working conditions were collected to verify the accuracy of the simulation analysis,and the heating law of this motorized spindle system and the cooling effect of the cooling system were further explored,providing key points for the subsequent optimization design of the cooling system.Finally,to improve the shortcomings,the common cooling structure,section shape,and specific size of the main shaft are studied and analyzed,and the optimization design of a new type of variable speed double helix cooling system is completed.Employing finite element analysis,the temperature field distribution and thermal deformation cloud map of the motorized spindle of the variable speed double helix cooling system were obtained,and the cooling effect of the original T-shaped cooling system was compared and analyzed.The cooling power check of the new cooling system was completed to verify the reliability and superiority of the cooling system designed in this paper.At the same time,it can provide experience for the next generation of motorized spindle cooling system research and development.