Machining Process Program Evaluation And Parameter Optimization Based On The Carbon Emission Assessment

Rapid development of manufacturing industry brings a lot of convenience to human production and daily life.However,it produces some serious environmental problems simultaneously.Therefore,low carbon manufacturing mode has been the necessary need of the development of modern manufacturing industry.Machining process planning of mechanical products is an important factor which affects carbon emissions in the process of machining process,however,in the planning stage,owing to the diversity of carbon emission sources and the uncertainty of processing information of parts,researches on evaluating and optimizing the machining process program basing on carbon emissions at this stage will effectively enhance energy saving and emission reduction capacity of manufacturing enterprises.Combining the concept of life cycle assessment(LCA)with process planning method,the process of machining process planning including pre-evaluation,decision making and optimization was established.Meanwhile,the method of carbon emission evaluation and parameter optimization of machining process were respectively studied based on it,specific content is as follows:(1)Carbon emission pre-evaluation method of machining process program was established combining with the LCA method,contraposing the problem of carbon emission quantification.Since most of the existing researches focus on the actual manufacturing process,rated power value or field measurement data of the machine tool is often taken as the power data of the quantitative model.Owing to the energy consumption characteristic curve of equipment is dynamically changing according to the transformation of machine tool running status,the accuracy of quantitative method which adopting rated power value remains to be improved.Therefore,carbon emission pre-evaluation method of machining process program combining with the life cycle assessment method is mainly studied in this paper.Furthermore,the system boundary of carbon emissions in machining system is analyzed and the main source of carbon emissions and its main forms was studied.In view of the fact that the existing carbon emission quantification model is not practical enough,the new improved model basing on the carbon emission factor and machine tool specific energy consumption was proposed.Afterwards,flange plate CA6140 was taken as an example to introduce the optimization process of pre-evaluation,decision making and parameter optimization for its machining process program,besides,the research results was analyzed.(2)Aiming at the problem of low-carbon optimization of cutting parameters of processing program,the parametric carbon emission quantification model for machine tools was established by combining the method of specific energy consumption with the method of unit process energy consumption.Previous studies have shown that power modeling method mainly includes unit process modeling,cutting force modeling and specific energy consumption.It's hard to coordinate precision and implementing condition in terms of single method.In this paper,carbon emission function model taking four milling factors as variables of milling process was established considering the effect of spindle speed on material removal power by combining the method of specific energy consumption with the method of unit process energy consumption.Lastly,the optimal combination of machining parameters was solved by using genetic algorithm method,achieving the multi-objective optimization of the carbon emission and machining time.(3)In view of the relative lack of carbon emission evaluation and optimization software for machining process,the carbon footprint assessment system for machining process was developed.Basing on the theoretical evaluation model above,the design requirements of software was analyzed,besides,system architecture was constructed and the content and function of each module was well organized.The software was developed and programmed based on ASP.NET by using Visual Studio 2010.Meanwhile,gearbox was taken as an example to introduce the use flow of the software.