- 學位論文
細槽放電加工鎳基合金Rene 108之特性探討
An Investigation on the Characteristics for EDM Rene 108 Alloy by Fine Groove
摘要
本研究目的為細槽放電加工鎳基合金Rene108時探討再鑄層厚度與槽寬變化量之特性。以0.8 mm寬之電解銅電極，工件加工深度為5 mm。實驗的第一部分為使用田口法L_8 (2^7 )直交表規劃實驗參數，包括電壓與極性、高壓電流、低壓峰值電流、放電波幅、放電休止幅、伺服干擾、伺服穩定等，對再鑄層厚度與槽寬變化量之特性進行因子篩選。利用篩選後的因子進行第二部分以田口法L_9 (3^4 )直交表規劃實驗參數，進行最佳化單一品質特性探討。結果顯示影響再鑄層厚度之重要因子順序為低壓峰值電流、伺服干擾、放電休止幅及電壓與極性；影響槽寬變化量之重要因子順序為放電休止幅、放電波幅、電壓與極性及伺服干擾，將以上影響品質特性之重要因子進行確認因子探討。結果顯示再鑄層厚度之重要因子為低壓峰值電流、放電休止幅；槽寬變化量之重要因子為電壓與極性、放電波幅，故電壓與極性、放電休止幅為主要影響槽寬之因子。最佳化參數組合之再鑄層厚度驗證實驗結果顯示為0.006 mm，比對第9組直交表中最佳值0.009 mm改善了50%；最佳化參數組合之槽寬變化量驗證實驗結果為0.994 mm，比較第8組直交表中最佳值0.992 mm，改善了2.01%。本研究有助於鎳基合金Rene108放電加工參數調整依據並了解如何改善再鑄層厚度及槽寬品質。 關鍵詞：鎳基合金Rene108、放電加工、再鑄層厚度、槽寬變化量
並列摘要
The purpose of this research is to study the characteristics of the thickness of the recast layer and the groove width change of the nickel-based alloy Rene108 during the EDM of fine groove. The electrolytic copper electrode with a width of 0.8 mm, and the processing depth is 5 mm. The first part uses Taguchi method L_8 (2^7 ) orthogonal table to plan the experimental parameters, and the factors include voltage-voltage polarity, high-peak current, low-peak current, pulse on time, pulse off time, servo interference and servo stability. The factors are screened separately for the characteristics of the thickness and groove width of the recast layer. The second part is to use the screened factors to plan the experimental parameters of the orthogonal table ,and using the Taguchi method L_9 (3^4 ) orthogonal table to analyze the optimal quality characteristics. The results show that the important factors affecting the thickness of the recast layer are low-peak current, server interference, pulse off time, voltage and voltage polarity in sequence; the important factors affecting the groove width change are pulse off time, pulse on time, voltage-voltage polarity and servo interference. The experimental result of the recast layer thickness of the optimized parameter combination is 0.006 mm, which is 50% higher than the best value of 0.009 mm in the ninth orthogonal table; the experimental result of the groove width change of the optimized parameter combination is 0.994 mm, which is in line with the eighth group. Compared with the best value 0.992 mm, it is an increase of 2.01%. This study refers to adjusting the EDM parameters of nickel-based alloy Rene108 and understand to improve the thickness of the recast layer and the groove width change. Keywords：Nickel-based Rene108, Electric Discharge Machining, Recast Layer Thickness, Groove Width Change