Experimental study of polished flow field and processing of tapered confined jets for K9 optical elements
This paper proposes a processing method of conical constrained jet polishing,which constrains the originally perpendicular fine jet into an annular jet almost parallel to the surface of the workpiece.Numerical analysis of the polishing flow field is carried out using Fluent software,and the material removal function model is established ac-cording to Preston's equation.Taking K9 glass as the processing object,the processing experiment is carried out using the independently designed conical constrained jet polishing platform.The results show that the normal maxi-mum velocity of the conical constrained jet polishing method is 63.9%smaller than the tangential maximum veloci-ty,which reduces the impact damage of the jet in the direction perpendicular to the surface of the workpiece;after the conical constrained jet polishing,the surface roughness of the K9 glass shows a"V"distribution in the process-ing area with its arithmetic average roughness decreasing from 95.40 nm to 14.52 nm,and the surface quality has been significantly improved.The conical constrained jet polishing mainly relies on the shear force of the jet along the surface of the workpiece,which not only effectively reduces the normal impact force of the jet,but also reduces the dispersion of the jet beam by the constraint of the jet.The determined surface removal function indicates that deterministic polishing is expected to be realized;in addition,the annular jet outlet improves the efficiency of the jet polishing.
conical restraintimpact damagesurface roughnessK9 glassremoval function
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