Efficient and Precise Grinding of Sapphire Glass Based on Dry Electrical Discharge Dressed Coarse Diamond Grinding Wheel

Abstract

In this paper, in view of low grinding efficiency and poor ground surface quality of sapphire glass, the coarse diamond grinding wheel dressed by dry impulse electrical discharge was proposed to perform efficient and precise grinding machining of sapphire glass. The dry electrical discharge dressing technology was employed to obtain high grain protrusion and sharp micro-grain cutting edges. The influences of grinding process parameters such as wheel speed, depth of cut and feed speed on the ground surface quality, grinding force and grinding force ratio on sapphire glass were investigated, and the relationship between grinding force and ground surface quality was also revealed. The experimental results show that the grain protrusion height on the surface of a coarse diamond grinding wheel dressed by dry electrical discharge can reach 168.5 µm. The minimum line roughness Ra and surface roughness Sa of ground sapphire glass surface were 0.194 µm and 0.736 µm, respectively. In order to achieve highly efficient ground quality of sapphire glass, the depth of cut was controlled within 7 µm, and the wheel speed and feed speed were 3000–5000 r/min and 10–20 mm/min, respectively. The influences of feed speed and wheel speed on grinding force ratio were more significant, but the influence of depth of cut was little.

Investigation of the Effect of Process Parameters on Bone Grinding Performance Based on On-Line Measurement of Temperature and Force Sensors

“…Bone drilling and cutting are also widely applied in surgery, especially in trauma, dentistry, and plastic surgery. As is well known in the machining process, the process parameters have great impact on the process quality [23,24]. There are many publications of bone drilling and cutting focusing on the optimization of the process parameters [6,7,[25][26][27][28][29][30][31][32].…”

Research on the grinding performance of grinding wheel in the initial grinding stage after electric spark dressing of grinding wheel

“…The experiment found that the surface abrasive particles of the diamond grinding wheel after dry pulse discharge dressing were more prominent, and the prominent height was up to 168.5 µm. The dressed wheel can realize e cient grinding of hard and brittle materials [14] . The removal of diamond grinding wheel by copper and iron electrodes through dry discharge were studied and the results showed that the removal of binder by copper electrode was more than that by iron electrode, but the copper electrode was easy to cause abrasive particles to fall off, and the iron electrode had better removal effect on the graphitization of grinding wheel [15] .…”