- 學位論文
乾銑削鋁合金薄件時表面粗糙度及曲線輪廓度之探討
An Investigation on Surface Roughness and Contour of Curved Line of Aluminum Alloy in Milling Thin-Walled Part by a Dry Cutting Process
摘要
本研究利用乾銑削6061-T6鋁合金薄件時，分別探討對表面粗糙度及曲線輪廓度之影響特性。利用田口穩健製程設計探討表面粗糙度與曲線輪廓度之單一品質特性最佳參數組合，以L16(45)直交表規劃參數組合執行實驗，選用切削速度、每刃進給量、軸向深度、預留量與刀刃數為製程參數，分別進行濕銑削及乾銑削實驗，為減少時效變形影響，將工件加工後放置三天後再量測。實驗結果進行田口望小分析與變異數分析分別求得各品質特性之最佳參數組合。接著利用灰關聯生成正規化後，設定辨識係數計算灰關聯係數，並透過模糊理論求得衡量指標(MPCI)，利用此指標進行田口望大分析找出濕銑削與乾銑削切削在同時考量表面粗糙度和曲線輪廓度的多重品質特性最佳參數組合。研究結果顯示單一品質特性最佳化後濕銑削表面粗糙度平均值0.1337µm及曲線輪廓度3µm；乾銑削表面粗糙度平均值0.1822µm與曲線輪廓度1µm，因為乾銑削無切削液沖刷鋁屑進而黏屑導致粗糙度較高，但最佳化後切削速度較高能有效降低變形量。多重品質特性最佳化後濕銑削表面粗糙度平均值0.2618µm，曲線輪廓度為5µm；而乾銑削表面粗糙度平均值為0.1861µm，曲線輪廓度為5µm。乾銑削比濕式銑削可得到更好的表面粗糙度改善值約29%，但曲線輪廓度兩種環境之實驗結果皆為5µm，得知在不影響加工品質要求下，可採用乾銑削減少切削液使用來達到節省成本與綠色切削之目的。
並列摘要
In this study, when dry milling 6061-T6 aluminum alloy thin parts, the characteristics of the influence on the surface roughness and contour of curved line were discussed. Using Taguchi's robust process design to explore the best parameter combination of single quality characteristics of surface roughness and contour of curved line, the experiment was carried out with L16(45) orthogonal arrays planning parameter combination, and the cutting speed, feed per edge, axial depth, pre the allowance and the number of cutting edges are process parameters. Wet milling and dry milling experiments were performed separately. In order to reduce the effect of aging deformation, the workpiece was measured after being placed for three days after processing. The results of the experiment were analyzed by Taguchi Minori analysis and variance analysis to obtain the best parameter combination for each quality characteristic. Then use the gray correlation to generate the normalization of the experimental results, then set the identification coefficient to calculate the gray correlation coefficient, and obtain the measurement index (MPCI) through fuzzy theory, and use this index to conduct Taguchi analysis to find out the wet milling and dry milling cutting in It also considers the best parameter combination of multiple quality characteristics of surface roughness and curve profile. The research results show that after optimization of single quality characteristics, the average value of wet-milling surface roughness is 0.1337µm and the curve profile is 3µm; the average value of dry milling surface roughness is 0.1822µm and curve profile is 1µm. Sticky chips result in higher roughness, but the optimized cutting speed can effectively reduce the amount of deformation. After optimizing multiple quality characteristics, the average surface roughness of wet milling is 0.2618µm, and the profile of the curve is 5µm; while the average surface roughness of dry milling is 0.1861µm, and the profile of the curve is 5µm. Dry milling can obtain a better surface roughness improvement value of about 29% than wet milling, but the experimental results of curve profile in both environments are 5µm. It is known that under the same processing quality, the use of cutting fluid can be reduced to achieve The purpose of cost saving and green cutting.
參考文獻
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