DEVELOPMENT OF AN EXPERIMENTAL TECHNIQUE TO MODEL DEFLECTIONS IN SURFACE GRINDING

摘要

Deflections in surface grinding can lead to geometrical inaccuracies in the components being ground and can also limit production rates in the grinding process. This paper develops and tests an experimental technique to indirectly measure the deflections in the surface grinding process by comparing the actual mass removed during a grinding pass to the mass that would have been removed if there were no deflections. The relationships between the spindle power, normal force and grinding deflections are then derived. The experimental technique was applied to both a Brown & Sharpe 824 Micromaster conventional surface grinding machine, as well as a Blohm Planomat 408 CNC creep-feed grinding machine in the Grinding Research Laboratory at Dalhousie University. For the Brown & Sharpe surface grinder, the experimental results show a linear relationship between the spindle power and the grinding deflections, which agree well with the literature. For the Blohm Planomat grinding machine, however, the relationship between the spindle power and the deflections is nonlinear. Further investigation revealed that this nonlinearity is primarily due to the presence of backlash in the spindle lead screw.