Modeling And Analysis Of Energy Characteristics And Equivalent Carbon Emissions Of CNC Centerless Grinding Machine

Reducing carbon emissions from industrial products during the manufacturing phase and achieving green manufacturing is one of the key issues which the manufacturing industry is facing.At present,many scholars have conducted some theoretical studies on the sustainability evaluation of manufacturing processes from the three aspects: the product life cycle,the overall management of the plant,and the operation scheduling of the workshop.However,there are few studies relating to assembly manufacturing units.In addition,machinery manufacturing equipment is not only an industrial machine,but also an industrial product.As the manufacturing industry places more emphasis on the low-carbon performance of products,factories need a unified standard to achieve a sustainable grading of machinery manufacturing equipment.In this thesis,the energy consumption prediction and carbon emission evaluation of numerically controlled centerless grinding,a high-energy and high-pollution processing method are studied.Based on the bond graph theory and the centerless grinding kinetics model,the energy consumption of the grinding process is divided into two parts: the no-load energy consumption of the machine tool and the energy consumption of the material removal.The energy consumption prediction model of the centerless grinding process is then established.Finally,an equivalent carbon emissions model for processing equipment sustainable processes is proposed.Based on bond graph theory,key map models is established for the basic components of the machine tool,and the energy transfer,storage,and dissipation laws are studied.According to the correlation of the grinding power,the subsystem of the CNC centerless grinding machine is divided into the functional subsystem and the switch subsystem.Taking MK1080 type CNC centerless grinding machine as an example,the key model of the functional subsystem is established based on the actual structure of the machine tool.Based on the definition of the generalized physical quantity of key maps,the calculation method of the partial resistive component coefficients in the functional subsystem key map model is given based on the related documents of the parts,the threedimensional model of the machine tool and the no-load test.Software 20-sim is used for dynamic performance simulation,and functional subsystem’s no-load power model is derived based on the results.This model can describe the energy characteristics of the machine during no-load operation.Based on the grinding force and the workpiece kinematics models,the load characteristics of the transmission system and the feed system are studied.Through experiments,coefficients in the material removal power model are determined,and an energy consumption prediction model for grinding process is established with the no-load power model.The energy consumption(E),resource utilization(R),and waste(W)are determined by the carbon emission factor method,and then an ERWC equivalent carbon emission model is established,evaluating comprehensively low-carbon nature of the centerless grinding process.This work can establish a foundation for the sustainability classification of a CNC centerless grinding machine.