| Summary: | 碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 103 === In this study, a horizontal machining was employed to compositely electrolytic-abrasive polish the inner surface of Cr-Mo alloy steel, where a carbon-fiber-type non-directional conductive polymer (ESD 410C) as a tool electrode and alumina (Al2O3) as abrasives with sodium sulfate as the electrolyte. Effects of grit size (1, 3, 5 µm), load (0.05, 0.15, 0.25 N), and current (0 ~ 300 mA) on the surface roughness of workpiece were investigated.
Experimental results of abrasive polishing with non-feeding condition showed that the surface roughness Rmax and Ra were 0.135 μm and 0.036 μm under the load of 0.25 N and the grit size of 1 µm for 6 minutes. In electrolysis condition, the inner surface roughness Rmax and Ra were 0.193 μm and 0.068 μm under the current of 200 mA and the load of 0.25 N for 10 minutes. In Electrochemical abrasive polishing process, the inner surface roughness Rmax and Ra were 0.119 μm and 0.036 μm under a current of 200 mA and the grit size of 1 μm for 5 minutes.
A two-stage electrochemical abrasive polishing process was conducted. In the first stage, the workpiece was polished under the load of 0.25 N, the grit size of 1 µm, and a current of 200 mA for 4 minutes. In the second stage, the grit size 1µm was changed to 0.3 µm for 3 minutes, and the surface roughness Rmax and Ra were achieved to 0.144 μm and 0.046 μm.
Finally, an electrochemical abrasive polishing process with a tool feed was conducted. The inner surface roughness Rmax and Ra could achieve 0.129 µm and 0.037 µm after three strokes (60 minutes) under the load of 0.25 N, the grit size of 1 µm, and a current of 200 mA.
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