Analysis On Rheological Characters Of GER Polishing Fluid And Experimentations On GER Fluid-assisted Polishing

The giant electrorheological polishing fluid is a suspension consists of nanoparticleswith high permittivity,abrasive particles and silicone oil.Within the external electric field,thegiant electrorheological polishing fluid will show giant electrorheological effect,and thesolid particles inside it will combine into a chain-like structure alone the electric field line’sdirection due to the influenve of polarization force.This will lead to a remarkableimprovement of the viscosity and yield stress of the giant electrorheological polishing fluid.The giant electrorheological polishing technology just takes use of this unique character topolish the surfaces of workpieces without touching them.This polishing methord isappropriate to all workpieces no matter it is conductive or non-conductive.The observation of micro structure of the giant electrorheological polishing fluid ishelpful for us to understand better the movement and chain formation situation of the solidparticles inside the giant electrorheological polishing fluid with the influence of the externalelectric field.Meanwhile,it is also helpful understanding the microscopic mechanism of giantelectrorheological effect.Through the inspection we can know that compared withelectrorheological effect,the chain-like structures which is generated by giantelectrorheological effect are more sturdier and more closer.That is just the reason why theyield stress of giant electrorheological polishing fluid can be ten times higher than that ofelectrorheological polishing fluid’s.The rheological properties of giant electrorheological polishing fluid are importantinfluential factors to the giant electrorheological polishing technology.And the two mainfactors which can measure rheological properties of giant electrorheological polishing fluidare the viscosity and yield stress of the giant electrorheological polishing fluid withinexternal electric field.In this thesis,we use a self-made equipment to do researches of giantelectrorheological polishing fluid’s viscosity and yield stress,in order to find out how thistwo rheological properties related to abrasive’s species、abrasive’s size、abrasive’s denseness and many other factors.According to the conclusions we have gotten,it will offer adequatetheoretical evidence for the latter giant electrorheological polishing experimentations.Different from the acicular electrode used in the traditional electrorheological polishingexperimentations,our self-made five axes polishing machine has an integrated tool electrodewhich is also removable.With the help of the software Matlab,we can know the front electricfield appearance of the integrated tool electrode.We can also know the effective polishingarea through experimentations well.All the conclusions above show that the integrated toolelectrode is useful and it can be used in the latter giant electrorheological polishingexperimentations.In this thesis,we take use of the five axes polishing machine to do a series ofexperimentations on optical glass in order to probe how the following factors such as: kindsof abrasive、density of the giant electrorheological polishing fluid、the size of abrasive aswell as the voltage value、the gap between the workpiece and the integrated tool electrode、time of the whole polishing process and the speed of the motor affect the surface roughnessof workpiece to be polished.We find out all the discipline of how those factors affect thesurface roughness of workpiece,and get better polishing parameters which uesd in thepolishing experimentations on optical glass and finally get a satisfied experimental result.