Experimental Study On Truing And Dressing Bronze-bonded Diamond Grinding Wheel With Laser And Its High Speed Grinding Capability

With excellent grinding performance, Bronze-bonded Diamond Grinding wheels have a wide application prospect in the field of precision, ultra-precision, high efficiency grinding, grinding automation and difficult processing material forming. Because of the ultrahigh hardness of super-abrasive wheels, 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 super-abrasive wheels. Laser truing and dressing method based on thermal interaction without force interaction, was thought to be a promising method. With high peak power, low duty ratio, short pulse duration, high repetition frequency and controllable feature, the acoustic-optic Q-switched pulsed laser is considered to be suitable for truing and dressing super-abrasive wheels.Experimental study on truing and dressing super-abrasive wheels with laser was taken out. Acousto-optic Q-switched YAG pulsed laser machine, developed by our team, was employed to dress bronze bonded diamond wheels in orthogonal direction, utilizing the closed loop of the control system to control the output of the laser pulse. According to numerical model result, with proper laser parameter (power density/average power/pulse repetition frequency/focus-off parameter) and technics parameter (moving speed and rotation speed of grinding wheel), bronze and diamond was wiped off selectively. Experimental study on carborundum truing and dressing method was also taken out to compare with the laser truing and dressing method. In addition to microcosmic appearance of the wheel trued and dressed with laser and carborundum, the truing and dressing effect affected by laser parameter was obtained.As a new method, laser truing and dressing needs to be checked by the grinding capability of the wheel, and the grinding capability is also helpful for optimizing the laser parameter. With the high grinding platform, high speed grinding experiment was taken out in the national engineering research center for high efficiency grinding. Change trend of the wheel grinding force,grinding temperature and the roughness of the workpiece surface along with laser dressing parameters was obtained. Compared with the carborundum truing and dressing method, it was established that, when grinding alumina, grinding force and grinding temperature is smaller dressed by laser with suitable parameters.