The Effect Of Nanoparticle Content And Flow Rate Ratio On Coaxial Electrostatic Atomization Cutting Performance

In order to solve the problems of high pollution and high cost in traditional cutting,micro lubrication has become a green cooling and lubrication method instead of traditional pouring.However,its cooling and lubrication performance is insufficient and the atomization dispersion is large,which is easy to be inhaled by the human body and poses great health hazards.Compared to traditional cutting lubrication and micro lubrication methods,nanofluid coaxial electrostatic atomization cutting has better lubrication and cooling performance,which can effectively reduce cutting temperature and cutting force,improve machining quality and efficiency.In addition,this method also has advantages such as environmental protection,energy conservation,and safety,and is suitable for various mechanical processing fields.Therefore,this study explores the effects of nanoparticle content and external to internal flow rate ratio on the cooling and lubrication performance of coaxial electrostatic atomization,and provides theoretical support for the further development of coaxial electrostatic atomization machining.The specific research work is as follows:(1)Coaxial electrostatic atomization cutting atomization,charging,and electrowetting experiments under nanoparticle content and external to internal flow rate ratiosThe coaxial electrostatic atomization cutting atomization experiment was conducted using LB2000 as the external fluid and deionized water and deionized water based as the internal fluid.The atomization voltage range of different combinations of external and internal fluids at different flow rates was obtained.The common cone jet voltage was-6.5k V,and the atomization dispersion effect was optimal when the nanoparticle content was0.5vol.% or the external and internal flow rate was 4/8 ml/h.Experiments were conducted on the charging and wetting properties of coaxial electrostatic atomization under different nanoparticle content and external and internal fluid flow conditions.The maximum atomization current was obtained when the nanoparticle content was 0.3vol.% or the external to internal flow ratio was 4/8 ml/h.The atomization stability is best when there is no nanoparticle content or the ratio of external to internal flow is 9/3 ml/h.When the content of nanoparticles is 0.5vol.% or the ratio of external to internal flow is 9/3 ml/h,the electrowetting performance is the best.(2)Friction performance of coaxial electrostatic atomization under nanoparticle content and external to internal flow rate ratiosUsing YG8 hard alloy/45 steel as friction pairs,friction performance tests were conducted on a coaxial electrostatic atomization cutting test platform under different nanoparticle content and external to internal flow rate ratios.The friction coefficient,wear amount,wear scar width and depth were measured to characterize the anti friction and wear performance.The surface morphology and element distribution of the hard alloy and grinding disc were observed to explore the friction and wear mechanism,The optimal nanoparticle content for obtaining friction reduction and wear resistance performance is0.1vol.% and the ratio of external to internal flow is 9/3ml/h.The friction and wear mechanisms are mainly adhesive wear,abrasive wear,and plastic deformation.(3)Heat transfer performance of coaxial electrostatic atomization under nanoparticle content and external to internal flow rate ratiosA heat transfer experiment was conducted on a coaxial electrostatic atomization heat transfer test platform for hard alloys with different nano particle contents and external to internal flow rate ratios.The heat transfer mechanism was explored by observing the heat transfer test process,and the heat transfer coefficient was calculated to characterize the heat transfer performance.The optimal cooling performance was obtained with a nano particle content of 0.3 vol.% and an external to internal flow rate ratio of 4/8ml/h.(4)Cutting performance of coaxial electrostatic atomization of nanofluids under nanoparticle content and external to internal flow rate ratiosA coaxial electrostatic atomization cutting experimental platform was established on a CNC machine tool,and aluminum alloy milling experiments,orthogonal optimization experiments,and validation experiments were conducted.The effects of nanoparticle content,external to internal flow rate ratio,and cutting speed on cutting force and cutting temperature were studied through methods such as signal-to-noise ratio,grey correlation degree,and variance.The results show that the suitable cutting parameters for reducing cutting force in aluminum alloy milling experiments are 0.1vol.% nanoparticle content and a flow rate ratio of 6/6ml/h;The suitable parameters for reducing cutting temperature are the content of nanoparticles at 0.3 vol.% and the ratio of external to internal flow rate at 6/6ml/h.In the orthogonal experiment,the cutting speed has the greatest impact on the single index of cutting force.The optimal parameter combination for reducing cutting force was optimized as follows: nanofluid volume fraction of 0.3vol.%,external to internal flow rate ratio of 4/8 ml/h,and cutting speed of 353m/min.The volume fraction of nanofluids has the greatest impact on the single index of cutting temperature.The optimal parameter combination for reducing cutting temperature was optimized as follows: nanofluid volume fraction of 0.3vol.%,external to internal flow rate ratio of 6/6ml/h,and cutting speed of196m/min.In the confirmatory experiment,the volume fraction of nanofluids has the most significant impact on multiple indicators(,followed by cutting speed and the ratio of external to internal flow rate.The optimal parameter combination was optimized as follows:nanofluid volume fraction of 0.3vol.%,ratio of external to internal flow rate of 4/8 ml/h,and cutting speed of 353m/min.