| Summary: | 碩士 === 萬能科技大學 === 電資研究所 === 107 === In this study, the effects of different cutting rates, turning coatings, and feed rates on machining are used when machining at low concentrations of cutting fluid. The tools used were uncoated, titanium nitride (TiN) and titanium aluminum nitride (TiAlN) coated ceramic tools, using the Taichung Seiki Vturn-P16 CNC lathe with 1mm, 1.5mm, 2mm and 2.5mm feeds. Feed rate of 0.1mm/rev, respectively, at a fixed cutting speed of 1,000 rpm and a fixed cutting speed of 78.5 m/min, turning the workpiece volume of each medium carbon steel round rod by 31,416 mm3, and using the MITUTOYO thick profile tester SV- The C3200 measures the surface roughness of the workpiece after turning to explore the effect of the tool coating on the turning performance and the cutting quality of the tool life.
The experimental results show that the tool life will decrease with the increase of the feed amount, but the surface roughness of the turned workpiece will decrease due to the increase of the feed amount. Both coatings can extend the tool life and reduce the surface roughness. The ceramic tool coated with aluminum-titanium-titanium plating has the most prolonged tool life and can maintain a low surface roughness for a long time because of the high hardness and oxidation resistance of the coating.
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