| In the process of promoting the economic development of China,the manufacturing industry also consumes huge energy resources,causing certain pollution to the environment.In the whole manufacturing industry,CNC machine tool is used more widely and the quantity is more and more huge.The energy-saving and emission-reduction is particularly urgent and important.Energy needs to be saved in the production process to increase energy output per unit,and reduce carbon emissions and the negative impact on the environment.Therefore,the study of energy efficiency and carbon emissions in the processing cycle can help enterprises achieve win-win economic and environmental benefits,and has a high practical significance.Considering that energy modeling is the basis of energy efficiency optimization,the accuracy of energy efficiency will directly affect the accuracy and accuracy of energy efficiency analysis.In view of the numerical control milling process,starting from the energy consumption analysis,the energy consumption of machine tools under different processing conditions is analyzed by using the monitoring platform of machine tool processing energy consumption.A model of energy efficiency calculation is proposed through the combination of theory and experiment,and its correctness is verified.Finally,on the basis of cutting experimental data,the influence of cutting parameters on energy utilization efficiency is analyzed.At present,researches on energy utilization of machine tools are mostly from the angle of power consumption,ignoring the impact of materials on energy efficiency.In order to analyze the utilization of energy and material in the process of machine tool more comprehensively on the same scale,based on energy efficiency analysis,the boundary and energy structure of milling process are defined under the analysis of utilization of energy and materials in milling process with exergy theory.The energy transfer balance equation of milling process is established,and the unbalance state of input and output of energy in the system are analyzed.Based on the orthogonal experiment datas of a milling machine,the influence of cutting parameters on energy loss and energy efficiency are studied,and the differences between the average energy efficiency in the traditional energy efficiency analysis and the exergy efficiency are compared.Based on the research of energy consumption,carbon emissions on the characteristics of each stage of the milling process are analyzed.The relationships between the carbon emissions of three kinds of indirect carbon sources in the process and input materials,energy consumption,waste recycling and other factors are defined.A carbon emission model of three carbon sources is established,and the carbon emission per unit volume material is used as a carbon efficiency standard.The influence of milling parameters and material removal volume on carbon efficiency is analyzed.The research on multi-objective optimization of machining process focuses on the lowest processing cost,the shortest completion time and the highest uti lization ratio of equipment in the workshop.But the carbon emissions and the efficiency of energy utilization are not taken into consideration.Therefore,on the basis of the study in the milling process of energy consumption and carbon emission,the four milling elements are as decision variables,a comprehensive consideration of energy efficiency,carbon emissions and processing costs for cutting parameters multi-objective optimization method is proposed,and a multi-objective optimization function corresponding is established.Then,the nonlinear programming genetic algorithm and the constraint condition s are used to solve the multi-objective mathematical model.Taking a convex template part milling as an example,the processing schemes of energy loss per unit volume,cutting carbon emissions and processing costs before and after optimizing are discussed in details,and the validity and practicability of the established model and method are verified. |
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