Particle size distribution characteristics of electrostatic minimum quantity lubrication and grinding surface quality evaluation

A new method of gas assisted electrostatic atomization minimum quantity lubrication is proposed to solve the problems of low effective utilization rate and threat to the environment and human health due to the low degree of particle size refinement and easy flying of micro droplets atomized by high pressure gas. The contrast test of atomization performance under different working conditions is carried out, and the surface quality of nickel base alloy grinding is evaluated. The atomization test results show that the atomization performance of charged liquid is significantly improved, and the percentage concentration of suspended inhalable small droplets (PM₁₀) is reduced while the average size and distribution span of droplets are reduced. And the higher the voltage is, the lower the mass concentration of PM₁₀ is. When the voltage reaches 35 kV, the atomization effect is the optimal, the average volume particle size and distribution span are reduced by 27.343% and 41.456% respectively, and the mass concentration of PM₁₀ is reduced by 5.065 percentage points. The results of grinding test show that the surface quality of the electrostatic minimum quantity lubrication is better than that of the minimum quantity lubrication by pneumatic atomization, and when the voltage is 35 kV, the surface roughness R_a and R_Sm are 0.377 μm and 0.084 mm, the surface quality of dry grinding workpiece is very poor, there are a lot of adhesion and peeling phenomenon, even a large area of surface material tearing, so dry grinding is not suitable for high temperature nickel base alloy processing.