The Grinding Performance Experimental Research Of Pulsed Fiber Laser Dressing Bronze-bonded Diamond Grinding Wheels

Bronze-bonded diamond grinding wheel has a good grinding performance, but it is hard to dress because of its high hardness. Laser dressing grinding wheel technology is a kind of extremely potential advanced dressing technology. However, because of the limitation of laser, the insufficient research of laser dressing and the lack of an effective dressing evaluation method, laser dressing technology has not entered the real industrial applications. In this thesis, tangential dressing, radial dressing and grinding experiment of bronze-bonded diamond grinding wheels using a pulsed fiber laser have been carried out, and the laser dressing effect is evaluated through the study of grinding properties of grinding wheel.A set of laser dressing system and grinding experiment platform is set up, which includes a set of fiber laser, the light path transmission device, the laser controller, the two-dimensional mobile platform and the grinding experiment platform.The grinding experimental study of fiber laser tangential dressing bronze-bonded diamond grinding wheels is carried out. After dressing, grinding wheel's circular run-out reaches about 15 ?m, the precision of profiling is high, but after grinding, the surface topography of grinding wheel and the surface quality of the workpiece are bad. Therefore, it could be concluded that the method of fiber laser tangential dressing bronze-bonded diamond grinding wheels profiles well, but sharpens hard.On the basis of laser tangential profiling, fiber laser radial sharpening and grinding experiment are carried out. The different laser parameters (laser average power, overlapping rate and the number of scanning laser cycle), which affect the surface topography of the grinding wheel and surface quality of workpiece, are studied. The optimum parameters of the laser radial sharpening are obtained:laser pulse overlapping rate and scanning line overlapping rate are 70%, the average power is 15W, the number of scanning laser cycle is 5. At the same time, the result could be inferred that the abrasive blade height is the essential influencing factor of sharpening, and the best abrasive blade height is one-third of abrasive particle size.Grinding contrast and wear resistance research are carried out. The grinding surface quality of laser dressing grinding wheel is better than that of mechanical method. The 100# bronze diamond grinding wheel grinding surface roughness is 0.878 ?m. Early in the grinding process of laser dressing grinding wheel, grinding wheel wear is mainly falling off wear and broken wear, which wear fast. In the normal wear stage, the main wear form is abrasion wear, the abrasive blade height changed little, the workpiece surface quality is stable and the grinding ratio is very large. But in the last process of grinding, falling off wear is more serious, the workpiece surface quality is badly and the grinding ratio is very small. The experimental results show that the pulsed fiber laser dressing Bronze-bonded diamond grinding wheel has a good grinding performance.