The Research On Accuracy And Grinding Performance Of Truing And Dressing Of Bronze-bonded CBN Grinding Wheels By Q-switched YAG Pulsed Laser

With excellent grinding performance, bronze-bonded CBN grinding wheel has a wide application prospect in the field of precision , ultra-precision, high efficiency grinding, grinding automation and difficult processing material forming. Because of the hardness of CBN is only lower than the diamond, the conventional mechanical truing and dressing methods based on force interaction are nearly impossible to meet the requirement for grinding process, which really affects the grinding performance of bronze-bonded CBN grinding wheel. The laser truing and dressing technology has unique advantages for the truing and dressing of super-abrasive wheel, and has been widely recognized that it was a very promising method.Through typical experiment research and theoretical derivation, a method which can reducing the option range of laser and parameters effectively is obtained for different types wheels, under the premise of guaranteeing the accuracy and efficiency.The bronze-bonded CBN grinding wheel is trued and dressed with self-made 200W acoustic-optic Q-switched Nd: YAG laser, combining mechanical method. The surface circular run of bronze-bonded CBN grinding wheel reduces from 400μm to 28μm, by the method of truing and dressing in high power and high pulse energy laser, and truing and dressing by silicon carbide wheel secondly, and truing and dressing in low power and low pulse energy laser lastly. The morphology of wheel surface after laser truing and dressing is analyzed by means of stereo microscope. And researches the grinding performance through scratching aluminum and measuring grinding force experiments. The results prove that: after trued and dressed by this method, the surface circular run is low, and the morphology is good. The CBN abrasives have ideal height, good grinding performance and are evenly distributed at the same time. All performance are better compared with the wheels trued and dressed by mechanical method.The bronze-bonded CBN grinding wheel is ablated in different angles with self-made 200W acoustic-optic Q-switched Nd: YAG laser. And researches the influence of angles for the efficiency of the laser truing and dressing. The results prove that: the efficiency is highest when the angle is between 30 degree and 40 degree. True and dress bronze-bonded CBN grinding wheel in 30 degree with self-made 200W acoustic-optic Q-switched Nd: YAG laser, and analyze the morphology of wheel surface. The morphology of wheel surface is good. And compared with the wheel trued and dressed by laser in 0 degree the difference is that there is some bond against CBN abrasives looked like hills. That will improve the holding force of CBN abrasives and the grinding performance.