| Summary: | 碩士 === 國立臺灣海洋大學 === 機械與機電工程學系 === 102 === The purpose of this thesis is to study of the effect of the multi-notch type changeable-stiffness fixture on the precision of aluminum alloy A6061-T6, in order to understand the effect of the tool fixture stiffness on the precision of the turning process. The experiments are divided into the flexible and the vibration assisted flexible turning two parts. Comparing the surface roughness of the two parts of experiments with traditional turning’s, and comparing the flexible turning with the vibration assisted flexible turning.
According to the actual depth of cut regression analysis , cutting speed and feed have no influence on actual depth of cut and change of the ratio of the depth of cut in the flexible and the vibration assisted flexible turning. In the same of setting depth of cut situation, actual depth of cut decreases as tooltip displacement increases and the change of the ratio of the depth of cut increases as tooltip displacement increases.
According to both the surface roughness regression analysis and the actual depth of cut regression analysis, the values of surface roughness of the flexible and the vibration assisted flexible turning tend to be better than the traditional turning under lower cutting speed, lower feed, higher actual depth and higher tooltip displacement of cut conditions. The best improvement rate of surface roughness of the vibration assisted flexible turning relative to traditional turning occurs at cutting speed of 50 m/min, feed 0.03 mm/rev, for tooltip displacement of 4.25 μm, surface roughness improvement rate is 35.2% under actual depth of cut of 0.039 mm. And the best improvement rate of surface roughness of the flexible turning relative to traditional turning occurs at cutting speed of 50 m/min, feed 0.03 mm/rev, for tooltip displacement of 4.25 μm, surface roughness improvement rate is 34.2% under actual depth of cut of 0.041 mm.
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