Study On Electrical Discharge Dressing (EDD) Metal-bond Diamond Grinding Wheel

Electrical discharge dressing(EDD)is an effective approach for dressing metallic bond grinding wheel.Currently,the generation mechanism of wheel topography is not sufficiently expounded.Research relevant to EDD-shaped grinding wheel is limited,which confines the development and application of complex surface components.This paper aims to investigate the micro-topography generation mechanism of metal-bond diamond grinding wheel during EDD process.The influence of dressing parameters on wheel surface generation was elaborated.V-tip metal-bond diamond grinding wheel was selected as dressing objective,and its EDD technology and process were investigated.1.EDD platform was set up,and EDD experiments for metallic bond diamond grinding wheel were conducted.Dressed wheel surface observation was conducted with scan electron microscopy(SEM),white light interferometer(WLI),Raman spectrometer and energy dispersive spectrometer(EDS).On the basis of spark energy distribution,the discharge removing mechanism was investigated.Wheel topography generated with different dressing parameters was verified with grinding experiment.The results showed that concentrated discharge phenomenon exists in EDD process,which protrudes grains and weakens anchoring force of grain;2.EDD experiments of metallic bond diamond grinding wheel were conducted with different dressing parameters,including current,voltage pulse-width,wheel rotation speed and wheel tangential step length.The dressed wheel was evaluated with observation of SEM and WLI,and wheel topography dressed with varied dressing parameters was verified with grinding experiment.It could be indicated that chip space and grain protrusion height were both influenced by dressing current or dressing voltage pulse-width,pullout strength of grains and cavities quantity were respectively affected by wheel dressing speed and wheel tangential step length.The influence mechanism of dressing parameters on wheel topography and EDD efficiency was clarified;3.EDD shaped grinding wheel process and setup were researched.The influence of discharge parameters on wheel surface and dressing efficiency was discussed.Based on optimization of dressing parameters,V-tip metallic bond diamond grinding wheel was successfully dressed with EDD method.As a result,compared with non-dressed tip(angle is 47.986±0.408o,and radius is 74.8±4.4?m),angle and radius of the dressed tip are respectively 45.334±0.208o and 29.5±0.6?m.In this paper,the EDD mechanism of metal-bond diamond grinding wheel was investigated.The generation mechanism of wheel topography during EDD process was clarified.These could provide theoretical basis and process reference for EDD shaped metallic bond diamond grinding wheel.