Research On Exergy Efficiency Model And Coordinative Optimization Method Of Spindle System Of High-speed Dry Hobbing Machine Tool

Machine tool is a basic manufacturing equipment and its energy efficiency is an important academic hotspots in the field of green manufacturing.High-speed dry hobbing machine tool is the core supporting equipment of green high-speed dry hobbing technology,its machining accuracy and accuracy consistency are directly related to the thermal stability of the spindle system.The thermal stability of spindle system under high-speed dry hobbing process depends heavily on its thermal energy accumulation characteristics which determined by the cutting parameters and the operating parameters of the spindle auxiliary system.This results in high energy consumption and complex energy flow characteristics of spindle system.However,the current energy efficiency analysis method based on cutting specific energy focuses on the modeling and optimization of the electrical-mechanical energy conversion problems in the material removal process.Moreover,it can not uniformly quantify the electrical energy,mechanical energy and thermal energy with different qualities.Therefore,the current energy analysis method is difficult to reveal the conversion characteristics of electrical energy,mechanical energy and thermal energy,and difficult to apply to comprehensive energy efficiency analysis of spindle system where both material removal and thermal stability are taken into consideration,which restrict the green and precision development of high-speed dry hobbing machine tools.In view of this,supported by the projects of the National Natural Science Foundation of China,the Green Manufacturing System Integration Project of the Ministry of Industry and Information Technology,and the Chongqing Technology Innovation and Application Demonstration Project,by taking the spindle system of high-speed dry hobbing machine tool as the research object,the "quantity" and "quality" of electrical energy,mechanical energy and thermal energy during the operation of spindle system are unified based on the second law of thermodynamics,and the modeling and coordinative optimization of the exergy efficiency of spindle system are studied in depth.The main research contents are as follows:At First,the multi-energy flow characteristics and exergy efficiency model of spindle system of high-speed dry hobbing machine tool are studied.Based on the analysis of the energy flow characteristics of high-speed dry hobbing machine tool,the conversion characteristics of electrical energy,mechanical energy and thermal energy in the spindle system under the strong thermodynamic coupling effect condition are revealed,and the multi-energy flow models of electrical energy,mechanical energy and thermal energy of spindle system are established.By analyzing the difintion and connotation of comprehensive energy efficiency,the exergy efficiency model is developed with considering the energy consumption for material removal and thermal stability control as useful energy consumption.It lays a theoretical foundation for the following study of thermal energy control and coordinative optimization of exergy efficiency of spindle system of high-speed dry hobbing tool.Secondly,the study of thermal energy accumulation model and control method of spindle system of high-speed dry hobbing machine tool are carried out.For the thermal energy accumulation problem closely related to the thermal stability control of the spindle system,the mathematical model of thermal energy accumulation and its control parameters in the spindle system of high speed dry hobbing machine tool is established based on the analysis of thermal energy generation and dissipation characteristics.Moreover,the optimization method of temperature rise for the spindle system of high speed dry hobbing machine tool is proposed.Finally,the thermal energy accumulation control effect of spindle system of high speed dry hobbing machine tool is verified by introducing a case study.It provides a support for coordinative optimization of exergy efficiency of spindle system.Thirdly,the research on coordinative optimization of exergy efficiency of spindle system of high-speed dry hobbing machine tool is carried out.Considering the thermal stability control and energy efficiency improvement of spindle system simultaneously,a collaborative optimization model is build for maximizing the comprehensive exergy efficiency and minimizing the average temperature of the spindle system of high-speed dry hobbing machine tool.A multi-objective imperialist competition algorithm is proposed to solve the optimization method.The effectiveness of the proposed model is validated by a case study.Finally,based on the above research,an application system for coordinative optimization of exergy efficiency of spindle system of high-speed dry hobbing machine tool is developed based on MATLAB platform,and the developed system is validated by an application case.