Numerical Simulation Of Abrasive Flow Polishing Technique Based On Monte Carlo Method

Abrasive flow polishing technology is an unconventional finishing process that improves surface quality and plays an important role in the military and civilian fields.In order to achieve the purpose of finishing,solid-liquid two-phase abrasive flow polishing technology is based on the fluid as the carrier to drive the abrasive particles to perform irregular movements on the channel or surface to be processed,so that the surface to be machined is subjected to random collision to complete the micro-cutting of the surface to be processed.Therefore,the study of the movement law of abrasive particles plays an important role in the research of abrasive flow polishing technology.In order to investigate the influence of abrasive grain movement on the abrasive grain flow finishing process during the grinding process of abrasive grain flow,this paper adopts the direct simulation Monte Carlo method to simulate the particle collision during the grinding process of abrasive grain flow.The numerical simulation analysis of the abrasive flow polishing was carried out with the variable diameter tube and the U-shaped tube as the research object in consideration of the collision of the abrasive particles and non-consideration of the collision of the abrasive particles.The dynamic pressure,the turbulent kinetic energy and the distribution of the abrasive particles in the flow field were obtained to analyze the impact of the collision of abrasive particle on the abrasive flow finishing effect.The influences of the above processing parameters on the polishing effect of the abrasive flow were analyzed by numerically simulating 90° elbow for different abrasive flow polishing parameters such as abrasive particle size,abrasive mass flow and inlet velocity.According to the results of numerical analysis,90° elbows and variable diameter tubes were used as test samples.The orthogonal test and comparative test analysis were carried out to obtain the surface roughness and surface topography under different polishing conditions.The mathematical model of the relationship between the surface roughness of the workpiece and polishing process parameters was established.Through the analysis of the test results,the surface roughness of the workpiece polished by the abrasive flow has been significantly reduced,and the workpiece surface has also become more smooth.Through numerical simulation and experimental research,the influence of the collision between the abrasive particles and the abrasive particles on the polishing effect of the abrasive flow during the grinding process of abrasive particles was studied.The influence rules of different processing parameters on the polishing effect of abrasive particles flow were investigated and verified.The validity of the numerical simulation of the process of abrasive grain flow polishing by the direct simulation Monte Carlo method was verified,and it provided some theoretical and technical support for the development of abrasive grain flow polishing technology.