The Experimental Studies Of Dressing Of Bronze-bonded Diamond Grinding Wheels Using Flat-top Laser Beam

The profiling and sharpening of bronze-bonded super abrasive grinding wheels remain a worldwide difficult problem despite their more and more applications in the fields of precision grinding, ultra-precision grinding and difficult-to-cut material grinding over the years and significant advantages on grinding performances. However, the traditional dressing method is difficult to effectively repair and maintain. Laser profiling and sharpening method in this area has many advantages, such as, small heat-affected zone, dressing small loss, easy to realize automation, finishing high efficiency and a broad prospects.(1)The fiber laser dressing experimental system with no dark spots and beam element to reshape the diffraction of focused is desi gned. And the funct ions and features of vari ous p arts of the s yst em are described and anal yz ed i n det ails and depth s.(2)The three parameters to control the great influence on the shaping accuracy: the laser power density, scanning speed, the rotating speed of the laser profiling of bronze bonded diamond grinding wheels by fiber laser. The laser profiling experiments were carried out based on the optimized processing parameters by the bronze-bonded super abrasive grinding wheels of dull. And the surface morphology and round plastic surgery before and afte r shaping the run out error were analyzed. The results showed that the contour accuracy of bronze bonded diamond grinding wheels after laser surgery can basically meet the requirements of the coarse-grained grinding wheel. Then analyzed the surface morphology, the circular run-out error,the shaping efficiency and the degree of graphitization of diamond grits, profiled by Flat-top laser and the Gaussian laser. The results indicated that the method of profiling’ efficiency by Flat-top laser is higher.(3)In order to study the effect of the key processing parameters that including the laser power density, laser spot overlap ratio, laser scanning track line overlap ratio, and number of laser scanning cycles to laser sharpening of bronze-bonded diamond grinding wheels, experiments of laser ablation were carried out on bronze-bonded wheels. The laser sharpening experiments were carried out based on the optimized processing parameters by the bronze-bonded super abrasive grinding wheels after profiling. The results showed that the surface topography of grinding wheel is good, and the abrasive prominent is highly appropriated, so the let chip space is enough. Immediately following analyzed the surface morphology and the degree of graphitization of diamond grits. The results indicated that Flat-top laser is better than the Gaussian laser in terms of sharpening of bronze-bonded diamond grinding wheels.(4)The two bronze-bonded diamond grinding wheels after laser sharpening and Mechanical sharpening are both used to grind the YG8 cemented carbide. To sum up, the Laser profiling and sharpening of bronze bonded diamond grinding wheel has better dressing effect and the grinding performance through compar ing the surface morphology and roughness of work piece, the surface morphology of grinding wheels before and after grinding.