Study on the Surface Quality of Finished by Abrasive Jet with Grinding Wheel as Restraint

The surface quality, such as microscopic topography and tribological characteristics finished surface by abrasive jet with grinding wheel as restraint were evaluated and analyzed. Experiments were performed with plane grinder M7120 and workpiece material 40Cr steel. The machined surface morphology was studied using Scanning Electron Microscope (SEM) and microcosmic geometry parameters were measured with TALYSURF5 instrument respectively. According to the metrical results, the surface topographical characteristics were evaluated with power spectral density (PSD) about machined surface before and after finishing. The results show that longitudinal geometry parameter values of finished surface were diminished comparing with ground surface,and the mean ripple distance was decreased and, ripple and peak density were increased. The tribological characteristics of finished surface were also investigated with pin on disk wear tester of MG-2000 tester. The experimental results show that the friction coefficient and wear amounts of finishing machining surface were obviously decreased comparing with ground surface. As a result, life and precision consistency of finished workpiece were improved and the experimental result of tribological characteristics was agreement with PSD analysis.