Multi-objective optimization in wire-electrical discharge machining of polycrystalline diamond
碩士 === 國立臺灣科技大學 === 機械工程系 === 105 === This work is to evaluate the machining performance in multiple objectives when cutting of polycrystalline dick using wire electrode discharging method. The 2 μm polycrystalline with 8-15% cobalt having weak conductivity (1.8×10-4 (Ωm)-1) and necessitated a besp...
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ndltd-TW-105NTUS54890282017-10-31T04:58:51Z http://ndltd.ncl.edu.tw/handle/52855159860947690343 Multi-objective optimization in wire-electrical discharge machining of polycrystalline diamond 多晶鑽石在線放電加工之綜合指標優化研究 Hung Chang 張弘 碩士 國立臺灣科技大學 機械工程系 105 This work is to evaluate the machining performance in multiple objectives when cutting of polycrystalline dick using wire electrode discharging method. The 2 μm polycrystalline with 8-15% cobalt having weak conductivity (1.8×10-4 (Ωm)-1) and necessitated a bespoke feature to couple with preferable parameter sets for discharging actions. In this experiment, the influences of open voltage (80-180 V), ignition intensity (0.4-0.9 A), pulse on-time (0.1-0.3 µs), pulse off-time (10-20 µs) on the material removal rate, surface roughness, surface asperity and edge radius was resolved with statistical methods (ANOVA) in an orthogonal array (Taguchi L18). The developed empirical model suggests the preferable parameter sets for the multi-objective optimization while equal weightings are given to each objective. The results suggest the high pulse on-time (0.3 µs) produce higher material removal rate (22.9 mg/min) and the lower pulse on-time (0.1 µs) produce lower surface roughness (Ra 1.42 µm) whilst the lower open voltage (80 V) leads to lower surface asperity (0.63µm) and small edge radius (32.6 µm) on the machined surface. When compared the experimental results to the modelling values, the least error for material removal rate, surface roughness and surface asperity are 10.3%、3.04%、26.09% respectively under the preferable parameters of open voltage (126 V), ignition intensity (0.9 A), pulse on-time (0.1 µs), and pulse off-time of (20 µs). Chun-Liang Kuo 郭俊良 2017 學位論文 ; thesis 54 zh-TW |
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碩士 === 國立臺灣科技大學 === 機械工程系 === 105 === This work is to evaluate the machining performance in multiple objectives when cutting of polycrystalline dick using wire electrode discharging method. The 2 μm polycrystalline with 8-15% cobalt having weak conductivity (1.8×10-4 (Ωm)-1) and necessitated a bespoke feature to couple with preferable parameter sets for discharging actions. In this experiment, the influences of open voltage (80-180 V), ignition intensity (0.4-0.9 A), pulse on-time (0.1-0.3 µs), pulse off-time (10-20 µs) on the material removal rate, surface roughness, surface asperity and edge radius was resolved with statistical methods (ANOVA) in an orthogonal array (Taguchi L18). The developed empirical model suggests the preferable parameter sets for the multi-objective optimization while equal weightings are given to each objective. The results suggest the high pulse on-time (0.3 µs) produce higher material removal rate (22.9 mg/min) and the lower pulse on-time (0.1 µs) produce lower surface roughness (Ra 1.42 µm) whilst the lower open voltage (80 V) leads to lower surface asperity (0.63µm) and small edge radius (32.6 µm) on the machined surface. When compared the experimental results to the modelling values, the least error for material removal rate, surface roughness and surface asperity are 10.3%、3.04%、26.09% respectively under the preferable parameters of open voltage (126 V), ignition intensity (0.9 A), pulse on-time (0.1 µs), and pulse off-time of (20 µs).
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Chun-Liang Kuo |
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Chun-Liang Kuo Hung Chang 張弘 |
author |
Hung Chang 張弘 |
spellingShingle |
Hung Chang 張弘 Multi-objective optimization in wire-electrical discharge machining of polycrystalline diamond |
author_sort |
Hung Chang |
title |
Multi-objective optimization in wire-electrical discharge machining of polycrystalline diamond |
title_short |
Multi-objective optimization in wire-electrical discharge machining of polycrystalline diamond |
title_full |
Multi-objective optimization in wire-electrical discharge machining of polycrystalline diamond |
title_fullStr |
Multi-objective optimization in wire-electrical discharge machining of polycrystalline diamond |
title_full_unstemmed |
Multi-objective optimization in wire-electrical discharge machining of polycrystalline diamond |
title_sort |
multi-objective optimization in wire-electrical discharge machining of polycrystalline diamond |
publishDate |
2017 |
url |
http://ndltd.ncl.edu.tw/handle/52855159860947690343 |
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