Research On Precision Machining Technology Of Solid-Liquid Two-Phase Abrasive Flow Containing Magnetic Particles

Abrasive flow precision machining technology,as a new type of precision machining technology,can process various complex shapes with its unique advantages.This paper presents a new type of machining method,a solid-liquid two-phase abrasive particle flow precision machining method with magnetic particles,based on the traditional abrasive particle precision machining method combined with the advantages of magnetorheological polishing.In order to improve the internal surface quality of the nozzle work piece,the use effect of the nozzle work piece is improved.This paper combines the advantages of abrasive particle flow precision machining technology and magnetorheological polishing technology,and the theory,numerical simulation,and experimental verification analysis were used to study the polishing process of the nozzle of the solid-liquid two-phase abrasive flow containing magnetic particles.First,the precision machining characteristics of abrasive particle flow with magnetic particles in a single-hole injector are discussed.Numerical analysis is performed using magnetic field strength,inlet pressure,kinematic viscosity,and abrasive particle size as processing parameters.The results show that the selected processing technology parameters have an important effect on improving the internal surface quality of the injector.Then,based on the numerical analysis data of the single-hole injector,the two best and worst process parameters were selected for the numerical analysis of the five-hole injector.It is confirmed that the abrasive particle flow precision machining technology with magnetic particles is also applicable to five-hole injectors.Finally,the same process parameters were used to carry out abrasive particle flow processing experiments with magnetic particles.According to the analysis of the test results,it can be known that the inner surface roughness of the small hole area of the nozzle of the injector,which is precisely processed by the solid-liquid two-phase abrasive particle flow containing magnetic particles,is reduced from 0.336 μm at the beginning to 0.074 μm.The optimal process parameter combination was obtained through range analysis and variance analysis of orthogonal test.Based on the regression equation,a regression equation for the roughness value of the small hole area of the injector after the polishing process of the solid-liquid two-phase abrasive flow containing magnetic particles is studied.The difference between the fitted result and the actual one is small,which proves that the regression equation is feasible.In this paper,through numerical analysis and experiments,it is determined that the solidliquid two-phase abrasive particle flow precision machining technology containing magnetic particles is effective for the precision machining of the injector.The solid-liquid two-phase abrasive flow precision processing technology of particles can provide theoretical and technical support for actual production and processing.