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版權所有 翻印必究 指導老師 : 戴子堯 博士 學 生 : 郭怡彣 日 期 : 2011. 05. 23 2011/05/23 STUT 太陽能材料與模組實驗室 1 版權所有 翻印必究 Outline • 1. Introduction • 2. Experimental set-up and working procedure • 3. Results and discussions • 4. Conclusions 2011/05/23 STUT 太陽能材料與模組實驗室 2 版權所有 翻印必究 1. Introduction • The objective of this paper is to study the effect of using different chemicals on material removal rate, with varied stand off distances and chemical concentration in abrasive water jet machining. • The use of such chemicals on the taperness of drilled holes is also studied. 2011/05/23 STUT 太陽能材料與模組實驗室 3 版權所有 翻印必究 2. Experimental set-up and working procedure 2011/05/23 STUT 太陽能材料與模組實驗室 4 版權所有 翻印必究 3. Results and discussions • A series of experiments were conducted taking abrasive particle as Silicon carbide of 180 grit size which are of irregular spherical in shape, on a glass as a specimen, of thickness 4 mm. • The working pressure used here is of 60–80 N/ . 2011/05/23 STUT 太陽能材料與模組實驗室 5 版權所有 翻印必究 • The results are discussed to analyze the effect of stand off distance (S-O-D) and chemical concentration on material removal and taperness. • Analysis was made on: (1) S-O-D versus MRR, S-O-D versus taperness. (2) Chemical concentration versus MRR, chemical concentration versus taperness. 2011/05/23 STUT 太陽能材料與模組實驗室 6 版權所有 翻印必究 2011/05/23 STUT 太陽能材料與模組實驗室 7 版權所有 翻印必究 2011/05/23 STUT 太陽能材料與模組實驗室 8 版權所有 翻印必究 2011/05/23 STUT 太陽能材料與模組實驗室 9 版權所有 翻印必究 2011/05/23 STUT 太陽能材料與模組實驗室 10 版權所有 翻印必究 4. Conclusions • Based on the experiments conducted and observations made, following conclusions are drawn: • (1) The material removal increases with the increase in S-O-D, up to certain limit and further increase in the S-O-D beyond the limit results in decrease of the material removal. • (2) The material removal was found to be more in presence of chemically active liquids such as acetone and phosphoric acid rather than plain water in the slurry. 2011/05/23 STUT 太陽能材料與模組實驗室 11 版權所有 翻印必究 • (3) The material removal was identified to be the highest in the case of a slurry mixed with polymer (polyacrylamide) rather than other two chemical environments used in the experiments. • (4) The slurry with a polymer combination shows a continuous increase in material removal with a variation in the chemical concentration. • (5) The chemical concentration was observed to be having an influence over the taper of the holes produced. The hole taper in case of polymer combination showed almost nil taper. 2011/05/23 STUT 太陽能材料與模組實驗室 12 版權所有 翻印必究 Thank you for your attention 2011/05/23 STUT 太陽能材料與模組實驗室 13