Study On Multi-Scale Scaling Model Of Energy Efficiency In Complex Surface Milling And Its Process Optimization Method

Machinery manufacturing industry plays an important role in our national economy.However,at present,China's machinery manufacturing industry still has a series of problems such as high energy consumption,low efficiency and high pollution.Numerical control machine tool is an important energy consuming equipment in the process of machinery manufacturing.Based on this,this paper,relying on the project of national natural science foundation of China(No.:51875480)"multi-scale analysis of energy efficiency mechanism and multi-loop coupling optimization control of complex surface milling",conducts research on the optimization model and method of energy efficiency-oriented complex surface processing process elements.The main contents are as follows:(1)On the basis of analyzing the multi-scale energy efficiency of nc machining for complex surface,a multi-scale scaling model for nc machining for energy efficiency is proposed.Based on the multi-scale analysis of nc machining process energy efficiency,a multi-scale coupling optimization model for nc machining energy efficiency was proposed.On this basis,the mathematical model of energy consumption and energy efficiency optimization in nc machining process is established.Then,taking numerical control milling of complex curved parts as an example,parameter coupling optimization is carried out for micro workpiece,macro equipment and mesoscopic process respectively.This paper provides technical and theoretical support for the energy saving and emission reduction of nc machine tools in the actual machining process.(2)Based on the analysis of cutting layer parameters and machine tool energy consumption characteristics during nc machining,a method for optimizing machine tool energy consumption based on CNC milling layer parameters is proposed.By analyzing the relationship between cutting layer parameters,cutting parameters and tool geometry Angle in nc machining,a model based on parameter relationship is constructed.Then the response surface model of milling energy consumption and cutting layer parameters is obtained by fitting the experimental data with response surface center combination design method and multiple regression analysis.At last,variance analysis is carried out to verify the fitting degree of the model.(3)Facing the mesoscopic process layer,this paper analyzes the mapping law of tool geometry Angle and cutting parameter to energy efficiency in nc machining process of complex curved surface,and establishes the energy consumption model of nc machining process of complex curved surface considering tool geometry Angle and cutting parameter.On this basis,a multi-objective optimization model of complex surface cutting parameters and tool geometric angles for energy efficiency is established,and the model is solved by NSGA-II algorithm.Finally,the optimization effect is verified by case analysis.