Influence Of Nanoparticle Type On Coaxial Electrostatic Atomization And Processing Characteristics Of Nanofluid

MQL cutting technology is a green cutting method,but it has the problems of insufficient cooling performance and affecting the quality of the processing environment.Nanofluid coaxial electrostatic atomization cutting combines nanofluid micro-lubrication and coaxial electrostatic atomization,which can provide an effective way to solve the above problems.The physical and chemical properties and molecular structure of nanoparticles have an important influence on the atomization and machining performance of nanofluid coaxial electrostatic atomization.Therefore,this thesis proposes to carry out research on the influence of nanoparticle types on the atomization and machining performance of nanofluid coaxial electrostatic atomization cutting.The specific research work is as follows:1.Analysis of atomization and charging characteristics of nanofluid coaxial electrostatic atomization cuttingUsing LB2000,graphite oil-based,graphene oil-based and carbon nanotube oil-based as the outer fluid,deionized water,graphite water-based,carbon nanotube water-based and graphene oxide water-based as the inner fluid,the atomization test was carried out.The voltage range of applicable atomization forms under different combinations of outer and inner fluids is obtained,and it is found that the common voltage of applicable atomization forms is-6.5k V;within this voltage range,the atomization currents under different combinations of outer and inner fluids are measured,and the nanometer Effect of particle type on atomization morphology and stability.The effect of adding nanoparticles to the outer/inner fluid on the long cone angle of the cone jet depends on the combined effect of the charging properties and the physical properties of the inner and outer fluids(viscosity,surface tension,interfacial tension,etc.).In general,the addition of different nanoparticles to the outer and inner fluids can improve the dispersion effect at the end of the cone jet.2.Nanofluid coaxial electrostatic atomization cutting droplet velocity and composite droplet electrowetting performanceOn the coaxial electrostatic atomization cutting droplet velocity test platform and electrowetting contact angle measurement platform,the droplet velocity and electrowetting contact angle were tested by high-speed camera and horizontal video microscope respectively.Effect of particle type on droplet velocity and electrowetting performance of nanofluidic composite droplets.The electrowetting performance of composite droplets was the best when graphene was added to the outer fluid;the electrowetting performance of composite droplets was best when graphite was added to the inner fluid.Graphene oil-based/graphene oxide water-based has the best composite droplet electrowetting performance.3.Droplet transport and processing characteristics of nanofluid coaxial electrostatic atomization cutting under different particle typesFirstly,a droplet transport model was built,and the finite element simulation of the droplet transport process of coaxial electrostatic atomization cutting was carried out to study the influence of different particle types on the droplet transport state.It was found that no matter adding nanoparticles to the outer fluid or the inner fluid,or adding nanoparticles to the outer and inner fluids at the same time,the droplet velocity will increase,and the droplet transport efficiency P and the droplet transport volume will both decrease.On this basis,the coaxial electrostatic atomization cutting test platform was built,and the aluminum alloy milling experiment was carried out to study the effect of nanoparticle types on the cutting force and cutting temperature of nanofluid coaxial electrostatic atomization cutting.The results show that the outer fluid is suitable for adding graphene to reduce the cutting force and cutting temperature;the inner fluid is suitable for adding graphite to reduce the cutting force and cutting temperature.The outer fluid is LB2000,and the inner fluid is graphite water-based,which is the best fluid combination for coaxial electrostatic atomization cutting.