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Numerical simulation and experiment for on-line truing and dressing of bronze-bonded diamond grinding wheels with laser

CHEN Gen-yu1,2,CHEN Chong1,2,BU Chun2,JIA Tian-yang2(1.State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China;2.Laser Research Institute,Hunan University,Changsha 410082,China)  
Based on both numerical simulation and experimental investigation,much research work has been done on on-line truing and dressing bronze-bonded diamond grinding wheel by acoustic-optic Q-switched YAG pulsed laser.A 3-D mathematical simulation model and a heat transfer model of single pulsed laser ablating the diamond abrasive was established by means of finite element method,where the process of diamond graphitization was taken into account.The removal depth of the diamond abrasive in different laser parameters(such as focal position,pulse width and laser power) was measured,and the relationship between them was analysed,which helped us to select optimal parameters.The results show that: the laser power,pulse width and the focal position are the direct effects of the removal depth of the diamond abrasive;it will increase along with the increase of laser power,and decrease along with the increase of pulse width and the focal position.The on-line grinding wheel dressing was achieved with closed-loop control,CCD and laser triangulation displacement measuring instrument which were used in control of Q-switch and the on-line monitoring of the circular run-out of the grinding wheel.After laser truing and dressing,the accuracy was further improved,the circular run-out error was reduced,and the surface topography was improved too.
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