Experimental Study And Grinding Mechanism On Mixed Vegetable Oil Based Electrostatic Atomization And MQL

Sustainable manufacturing and cleaner production are the developing trends and requirements of today's manufacturing industry."China Manufacturing 2025" is the requirement of improving the quality and level of China's manufacturing industry in a new international and domestic environment.In the course of mechanical processing,the traditional cooling and lubrication methods generally use flood lubrication,but its large amount,serious pollution and other shortcomings prompted the emergence of minimum quantity lubrication technology.Although the pneumatic minimum quantity lubrication technology can reduce the amount of cutting fluid,there is splash and drift phenomenon in atomized droplets,which are harmful to the health of the operators.The electrostatic atomization minimum quantity lubrication technology is a low energy consumption,clean,environmentally friendly processing technology because it can achieve controllable atomization droplets transport.In view of the above analyses,this paper focuses on the lubrication mechanism of the mixed vegetable oil based minimum quantity lubrication grinding and the atomization mechanism of the liquid in the electrostatic field,specific research contents are as follows:1.In this paper,the research status of minimum quantity lubrication and electrostatic atomization at home and abroad was reviewed.The research direction of this paper was obtained in combination with "China Manufacturing 2025".2.The machining mechanism of minimum quantity lubrication grinding and the mechanism of abrasive particle cutting were studied.The evaluation parameters of lubrication performance,such as specific grinding force,specific grinding energy and workpiece surface roughness,were analyzed.3.The lubricating mechanism of castor oil mixed with other vegetable oils(soybean oil,maize oil,palm oil etc)as minimum quantity lubrication grinding fluid was studied by using nickel based alloy as the research object.By analyzing the physical and chemical properties(viscosity,molecular structure,etc)of vegetable oil and using the method of cross-correlation function characterization,the best mixed vegetable oil with the best lubrication performance was obtained.4.The effects of different volume ratios of castor/soybean oil on the minimum quantity lubricity were studied.By comparing the grinding force,surface roughness(Ra,RSm,tp)and fractal dimension,the lubrication performance of different volume ratio was evaluated.The optimum ratio of castor oil and soybean oil was obtained.5.The mechanism of charge,motion and fragmentation of liquid in high voltage electrostatic field and the influence law of atomization were studied.An electrostatic atomizing nozzle model was established by using Fluent software,and the flow field of the nozzle was simulated and analyzed.6.Droplet atomization in high voltage electrostatic field was studied,and relationship between droplet cone angle,particle size and jet parameters was obtained.The droplet size and spray cone angle at the exit of the nozzle were experimentally verified by high-speed camera and optical microscope.Based on above,the lubrication performance of minimum quantity lubrication grinding in high voltage electrostatic field was studied,by changing the voltage amplitude,the air pressure and the distance parameter from the nozzle to the target,the law of electrostatic atomization in minimum quantity lubrication grinding was obtained.