Research On Optimal Design Technology Of Centrifugal Pump For MRF

MRF technology is an advanced high-definition optical polishing technology,which has the advantages of high processing accuracy,high processing efficiency,and few processing defects.In recent years,MRF technology is expanding to superhard materials and soft crystal polishing applications.It is necessary to use MRF fluid with a wide range of viscosity adjustments,which poses a higher challenge to the MRF fluid circulation system.The centrifugal pump in the circulating system of the existing MRF machine tool has the problems of low pumping efficiency,poor pumping flow stability,and low pumping viscosity stability when pumping high viscosity and lower viscosity MRF liquid.Therefore,in order to improve the performance of the centrifugal pump for MRF,it is urgent to explore the efficient and stable pumping mechanism and uniform stirring mechanism of the centrifugal pump for MRF,and to improve its main performance through structural optimization.Based on the analysis of the basic principle and main performance of the centrifugal pump for MRF,the evaluation method of the main performance(pumping efficiency,pumping flow stability,pumping viscosity stability)of the special centrifugal pump is proposed according to the previous work.The research on the mechanism and law of the main performance of the centrifugal pump for MRF and the performance evaluation of various centrifugal pumps for MRF provide the basis.The simulation method of the main performance of the centrifugal pump for MRF based on Pumplinx software was established,and the simulation analysis of the pumping efficiency and pumping flow stability of the immersive type centrifugal pumps for MRF was carried out.Compared with the experimental results,the maximum error of simulated pumping efficiency and simulated pumping flow stability is less than 17.4%.The influence mechanism and law of the centrifugal pump flow path curvature,flow path length,agitation speed and agitation flow pattern on the main performance of the centrifugal pump for MRF were studied,which provided the main optimization direction for the centrifugal pump for MRF.From the perspective of the optimization of the flow passage structure,stirring structure and temperature control structure,designed new split type and integral type centrifugal pumps for MFR respectively.Among them,the split type centrifugal pump for MFR utilizes the principle of the connector to separate the storage tank from the centrifugal pump body,while the integral type centrifugal pump for MFR adopts an integrated structure design in which the liquid tank is placed above the centrifugal pump body.The main performance test experimental platform was carried out to evaluate the performance of immersive type centrifugal pumps for MRF,split type centrifugal pumps for MRF and integral type centrifugal pumps for MRF Compared with the immersive type centrifugal pumps for MRF,the pumping efficiency,pumping flow stability and pumping viscosity stability of the developed centrifugal pumps have been improved to varying degrees.Among them,the overall performance of the integral type centrifugal pumps for MRF is the best.The development of new centrifugal pumps provide technical support for obtaining a stable removal function for magnetorheological polishing,higher removal efficiency,and high polished surface quality.