Research On Carbon Emission Assessment And Parameter Optimization In Machining Process

At present,environmental issues caused by excessive greenhouse gas emissions have attracted widespread attention from countries around the world.In recent years,with the rapid development of China’s economy,a large amount of energy and resources have been consumed and simultaneously generated a large amount of carbon emissions.The manufacturing industry,as a major contributor to carbon emissions,is one of the main sources of environmental problems.Mechanical processing is an essential part of the manufacturing industry,consuming a large amount of energy,resources,and generating corresponding waste.Its environmental impact has increasingly attracted the attention of academia and industry.To achieve low-carbon processing,calculating and evaluating carbon emissions during mechanical processing,as well as optimizing processing parameters,have become key issues in current research.This article focuses on the research of carbon emissions in the mechanical processing process,establishes a carbon emission model for the mechanical processing process,and realizes the calculation of carbon emissions.Using the theory of extension,a carbon emission evaluation system for mechanical processing has been established to further evaluate carbon emissions.The optimization of CNC turning parameters was carried out with the goal of reducing carbon emissions and saving processing costs.Finally,a carbon emission calculation and evaluation system for machining processes was developed.The main research content of this article is as follows:(1)A carbon emission model for mechanical processing has been established.In response to the wide range of carbon emissions in the mechanical processing process,the input and output characteristics are analyzed to determine the boundary of the carbon emission system.A carbon emission model for the mechanical processing process is proposed,which divides carbon emissions into energy carbon emissions,material carbon emissions,and waste carbon emissions for calculation.Taking the experiment of CNC turning outer circles as an example,the carbon emissions under different machining parameters were calculated,and the composition rules of carbon emissions under different machining parameters were obtained.(2)A carbon emission assessment method for machining processes is proposed based on the theory of extension.An extension analysis was conducted on carbon emissions during mechanical processing,and a matter element model of carbon emissions during mechanical processing was established based on primitive theory.Based on the extension structure of carbon emissions during mechanical processing,evaluation indicators for carbon emissions were determined.Using the extension optimization evaluation method,a carbon emission evaluation system for mechanical processing processes was established,and the material elements,classical domains,and nodal domains to be evaluated were determined.The CRITIC weight method was used to determine the indicator weights,and the correlation function was used to calculate the correlation degree.Finally,the evaluation level of carbon emissions was obtained.Taking the CNC turning experiment as an example,the carbon emissions under different machining parameters were evaluated,and the results showed that the carbon emissions evaluation results can scientifically and reasonably reflect the carbon emissions level of the machining process.(3)A multi-objective optimization method for CNC turning machining parameters under low-carbon and low-cost conditions has been proposed.A carbon emission model and processing cost model for CNC turning machining have been established with the optimization goal of reducing carbon emissions and saving processing costs.Taking into account the constraints of machine tool equipment and machining parameters,a multi-objective optimization model for machining parameters was established by selecting spindle speed,feed rate,and cutting depth as optimization variables.The NSGA-II algorithm was used to solve the optimization model to obtain the Pareto optimal solution set.Finally,the decision ranking of the solution set was carried out using the entropy weight TOPSIS method to obtain the optimal machining parameters.(4)Designed and developed a carbon emission calculation and evaluation system for machining processes.According to the design purpose of the system,a system architecture was constructed,which was divided into four modules:user management,carbon emission calculation,carbon emission assessment,and carbon emission information query.The functions of each module were designed.The system was developed using We Chat developer tools,achieving functions such as carbon emission calculation and evaluation during mechanical processing.The system’s usage process was introduced using CNC turning as an example.