Theoretical and experimental research on generation mechanism of grinding wheel topography by laser dressing and 3D laser scanning

摘要

The grinding wheel surface topography has large influence on the precision grinding quality and production efficiency. Rosined bonded grinding wheel has very small chip pocket due to its inherent compactness and the very poor grinding activity confines its further application in the heavy duty grinding process. The recently developed laser dressing technology reveals the accessibility to obtaining desirable grinding wheel topography. However, the problem how to effectively control the laser dressing process remains unsolved. This paper presented the promising work on grinding wheel topography generation mechanism through the laser grooving and evaluation by 3D laser scanning technology. Firstly, from viewpoint of thermal induced material removal mechanism, a numerical method was presented to simulate the laser dressing process. The numerical simulations could reveal the relations between the laser parameters and the groove shape formation very well. The laser dressing process could be easily controlled by setting the appropriate value of the received energy of the unit grinding wheel surface. The desirable dressing results could be obtained through the suitable selections of laser beam power, laser facula, laser beam-scanning velocity and overlap coefficient, etc A series of tests were conducted including laser dressing, 3D laser beam scanning for measurement and evaluation and grinding difficult-to-cut material with the dressed grinding wheel for comparative studies. The topography of the grinding wheel surface could be characterized by the laser triangulation sensors and the special software, thus the laser dressing results could be evaluated in very short time, and the feedback would be beneficial to the optimization of the laser dressing process. The validation for the laser dressing also could be conducted through the analysis of the grinding temperature and grinding forces signals. The comparison of dressing results obtained in different laser dressing cases proved the feasibility of laser dressing resin bonded grinding wheel and highlighted the importance of choosing appropriate laser dressing parameters.