The Research Of Plasma During Laser Dressing Of Bronze-bonded Diamond Wheel By A Fiber Laser

Bronze-bonded diamond wheel is one of the super-abrasive grinding wheelswith unusually excellent grinding performance, which excellent performance,however, is limited because of difficult truing and dressing especially in thedressing process. Until now, more and more scientists and researchers focus onthe truing and dressing of super-abrasive grinding wheel research, which existunsolved problems. Laser dressing based on thermal effect caused by theinteraction between materials and laser is a new and very promising method ofdressing with the advantages of wide suitability and selective removal, but thereare still many difficult problems to be solved. In this thesis, the plasmaproduced in the process of dressing bronze-bonded diamond wheel by laser arestudied, with bronze-bonded diamond wheel being experimental objects andpulse laser being the dressing tool.Firstly, the fiber laser dressing experimental system is designed, and thedesign principle of the system and the functions and features of various parts ofthe system are described and analyzed in details and depths, then the use andoperation of the system is introduced briefly.Secondly, the ICP-AES is elaborated and multichannel spectroscopy dataacquisition system is set up, which can be used to carry out ICP-AES methodand capture laser-induced plasma spectroscopy signals during the process oflaser dressing experiment.Again, in the constructed experiment platform,plasma characteristics ofbronze diamond grinding wheel dressed by laser are studied by using ICP-AES,including: plasma spatial resolution, relationship between spectral line intensityand laser parameters(laser average power and pulse frequency), spatialdistribution of plasma temperature and the relationship between temperature andlaser parameters, plasma Electron density spatial resolution and the relationshipbetween electron density and laser parameters, the spatial distribution ofplasma-induced inverse absorption coefficient.Finally, adding side-blown argon in the dressing process, the impact ofpressure on the plasma characteristics is deeply studied. Mainly including: theeffects of gas pressure on morphology of plasma space expansion, spectral line strength, plasma temperature and electron density. The results indicate thatside-blowing gas significantly inhibited plasma in the laser dressing process ofbronze diamond grinding wheel. Morphology analysis of the grinding wheelsurface after dressing showed that morphology after adding side-blown gas issignificantly superior to that without it.