| High-speed motorized spindle is the core component of high-speed machine tool.Compared with the traditional spindle,motorized spindle has obvious advantages in speed,precision and transmission performance.In the cutting process,due to the large internal heat of the spindle,the heat can not be distributed timely and effectively,a large amount of heat will be gathered together,which will cause serious thermal deformation of the spindle and affect the machining accuracy of high-speed machine tools.Therefore,it is of great significance to analyze the internal heating and heat transfer mechanism of high-speed motorized spindle and to study its cooling system.In order to solve the practical production problems of Dalian Inna Industrial Technology Co.,Ltd.,this paper analyzes the internal heating,heat transfer mechanism and heat dissipation of 98.2001 motorized spindle produced by Dalian Ina Industrial Technology Co.,Ltd.The cooling performance of two kinds of cooling water jacket that can be used is compared and analyzed,and a kind of cooling water jacket suitable for this type of motorized spindle is selected.At the same time,the optimum design of the cooling water jacket provides reference for the development of the next generation motorized spindle.Firstly,the structure,parameters and cooling system of the motorized spindle are analyzed,and the heat and heat transfer from the internal motor and bearing of the spindle are calculated,and the heat transferred from the internal heat source to the inner surface of the cooling water jacket is deduced.At the same time,combined with the actual cooling situation,the fluid-solid-thermal coupling simulation analysis is carried out based on the Fluent software,and the steady-state temperature distribution of the two kinds of cooling water jacket is obtained.Secondly,the infrared imaging experiment platform is built to test the cooling contrast,and the simulation results are verified.On this basis,the cooling efficiency and cooling ability of the two kinds of cooling water jacket are compared by taking the average temperature of the outer wall of the water jacket,the average temperature of the inner wall of the heating jacket and the cooling time under the same heating quantity as the evaluation parameters of the cooling performance of the two kinds of cooling water jackets.At the same time,the temperature distribution of each water jacket surface in the thermal steady state is compared and analyzed.It is found that the cooling efficiency and cooling ability of spiral water jacket are better,and it is suitable for motorized spindle with high calorific value and high cooling performance,while the overall temperature distribution of circulating water jacket is more uniform.The utility model is suitable for electric spindles with high precision requirement for heating stability.Finally,the structure,applicability and machining difficulty of the two kinds of cooling water jacket are analyzed comprehensively.According to the characteristics of heating and heat transfer of the motorized spindle,several cooling schemes are put forward,and a bi-directional double helix water jacket is provided based on the optimization of the spiral cooling water jacket at the same time.For the next generation of spindle research and development and cooling system related scientific research content to provide reference. |
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