Design And Simulation Of Magnetorheological Polishing Fluid Collector Based On Airflow Seal

The inverted magnetorheological polishing device has the characteristics of convenient clamping,high processing efficiency and strong applicability,and is widely used in the processing of large-aperture optical components.In the process of magnetorheological polishing,the polishing liquid is in a reciprocating state,and the polishing magnetorheological polishing liquid is absorbed into the recovery device after the collector is detached from the surface of the polishing wheel.The traditional collection method is to form an arc-shaped magnetic seal ring on the lower end of the collector or separate the polishing liquid adhered to the wheel surface by using a scraper.This collection method will cause serious wear on the surface of the polishing wheel,which will not only reduce the surface accuracy of the polishing wheel,but also introduce processing errors.At present,although the research on magnetorheological polishing technology at home and abroad has made some remarkable progress,there is little research on how to reduce the friction and wear of the polishing wheel surface during the collection process.Therefore,this paper proposes and designs a new magnetorheological polishing fluid collector to reduce wheel wear.The collection process of the new collector was simulated by using the fluid simulation software FLUENT,and the collection performance of the new collector was studied.The main research contents are as follows :Firstly,a new magnetorheological polishing fluid collector was designed and the size of the collector cavity was determined.On this basis,the main structure and airflow parameters affecting the collection effect of the new collector were selected.The orthogonal test design and control variables were used to simulate the new collector,and the optimal structure and airflow parameters were obtained.Secondly,the cavity models of two common traditional magnetic seal collectors are established,and the magnetic seal collectors are compared and analyzed.By comparing the average outlet mass flow rate of the two magnetic seal collectors,the optimal magnetic seal collector cavity model is selected.The optimal magnetic seal collector model is compared with the optimal new collector model designed in this paper,and the feasibility and collection effect of the new air flow seal collector are explored.Finally,the erosion wear of the polishing wheel surface and the collector wall surface when collecting with the new collector was studied.Five erosion wear models provided by FLUENT simulation software were used for simulation.After comprehensive analysis,the Generic model was selected as the erosion wear calculation model of magnetorheological polishing fluid.Based on this,the main erosion wear positions of the polishing wheel surface and the collector wall surface were predicted.The effects of different magnetorheological polishing fluid abrasive particles and nozzle airflow velocity parameters on the erosion wear of the new polishing fluid collector were studied.