Research On Dynamic Change Law Of Material Removal Process In Ultrasonic Vibration Polishing

In recent years,the optical complex surface elements have been more and more widely used,but at the same time,the demand for processing precision and surface quality has been increased.Due to the brittleness of hard brittle materials is larger,When machining in the abrasive action is easily broken,so its processing mechanism is complex,and the mechanism of ductile brittle material processing domain is more complex,and the ultrasonic vibration polishing ductile processing conditions,there is no in-depth research,the new technology used in all kinds of hard brittle materials processing also has many problems unsolved.In this paper,The polishing pad of inside and outside of pores and create the removal model of ductile materials,analysis of the ultrasonic vibration polishing material removal than ordinary polishing material removal fast main reason.And based on the single star,star abrasive action to create a physical model,analyzed the brittle-plastic get rid of the critical condition of schema migration,this paper expounds the polishing speed reduction and polishing the reasons of the limit,and the experiment was made in the model;Finally,the ultrasonic vibration polishing parameters are optimized by orthogonal test.This paper has carried out some research work on the above problems,which are as follows:(1)Study hard ductile material removal mechanism:first of all,through the analysis of polishing pad,calculate the polishing pad pore and flat storage of abrasive particle number,the polishing pad pore and flat part of the research physical model is set up respectively;Then the sum of its sum is the removal rate model of hard ductile material.Final design experiments using Inconel718 nickel-based alloy material verify the rationality of the physical model,and compared with traditional polishing,get the ultrasonic vibration polishing material removal is faster than traditional polishing material removal of the main reasons.(2)To study the critical conditions of brittle-plastic removal schema migration and dynamic change law:first by Hertz elastic contact theory to get single diamond grits invasion depth of physical model,and compare to critical processing depth of the workpiece material,and the critical conditions for brittle-plastic removal schema migration;Then on the basis of single diamond grits role model to get more than grinding grain physical model,polishing is obtained by MATLAB analysis the influence law of variable parameters on the material of plastic form,and expounds the cause of polishing speed reduction and polishing limit;Finally,the results obtained by using alumina ceramic materials are verified,and the polishing speed and polishing accuracy of ultrasonic vibration polishing are much higher than that of ordinary polishing.(3)Using the orthogonal experiment to ultrasonic vibration polishing parameters optimization:first of all to build on their own polishing device using orthogonal experiment method experiments the influence of process parameters on the single process indicators,analyzes the influence law;Then,based on the theory of grey correlation analysis,the process parameter optimization problem of ultrasonic vibration polishing is solved.Finally,the optimal scheme is tested and verified.