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研究生:李長征
研究生(外文):Li, chang-cheng
論文名稱:多種鎳基超合金放電加工特性與表面完整性研究
論文名稱(外文):Machining characteristics and surface intergrity of Ni-base alloy using electrical discharge machining
指導教授:王則眾王則眾引用關係
學位類別:碩士
校院名稱:國防大學中正理工學院
系所名稱:兵器系統工程研究所
學門:軍警國防安全學門
學類:軍事學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:96
中文關鍵詞:放電加工鎳基超合金田口氏實驗計畫法灰色理論再鑄層
外文關鍵詞:EDMNi-bsae superalloysTaguchi MathodGrey theoryrecast layer
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研究初始採用田口式實驗計畫法,規劃雕模放電機加工鎳基超合金參數,探討單一加工特性品質,諸如材料移除率、電極消耗率及表面粗糙度等最佳加工參數組合。本研究先後採用三種加工參數改良方式:第一,以田口方法為主的分析法,獲得單一品質最佳加工參數組合,第二,以灰色理論為主,獲致多重品質加工最適參數組合,第三,建立一非線性迴歸加工參數關係式,以得到加工特性與加工參數間之經驗公式,所獲得實驗結果分析可提供日後業界相關設計及製造鎳基超合金之參考。最後,探討鎳基超合金經放電加工後之表面再鑄層(RCL)特性,在此階段研究中,由掃瞄式電子顯微鏡(SEM)觀測發現某些放電條件下,鎳基超合金之表面再鑄層具有樹枝狀生長方位之微觀組織,並深入探討放電再鑄層組織之產生機制與造成之原因。
In order to understand the Ni-base superalloys cutting process by electrical discharge machining, Taguchi method was obtained to efficiently determine the optimum conditions for gaining higher material removal rate, lower electrode wear rate, and finer surface respectively. The grey theory was superior to Taguchi’s in dealing with the multiple quality evaluation since the latter one was adopted usually in dealing with the single quality evaluation. Thus, an integrated consideration from both methods was proposed herein to inherit benefits from both ones to accelerate the optimization process. Three kinds of methods to obtain the better composition of signal and multiple parameter: (1) Taguchi base calculation to find the optimum single machining characteristics for EDM; (2) grey theory provides the optimum multi-objective machining characteristics; (3) with non-linear regression calculation link to EDM machining function for parameter condition were altogether shown in this paper. These three steps could satisfy the need for industry manufacturing. Finally, the experiment was conducted to understand the surface transformation and characteristic of recast layer (RCL) in Ni based alloys after EDM.
目錄
誌謝 ii
摘要 iii
ABSTRACT iii
目錄 iv
表目錄 viii
圖目錄 ix
符號說明 xii
1. 緒論 1
1.1 研究動機 1
1.2 研究目的 2
1.3 文獻回顧 3
1.3.1 鎳基超合金之應用與發展 4
1.3.2 鎳基超合金之加工 5
2. 基本原理 8
2.1 鎳基超合金材料 8
2.2 放電加工原理 9
2.2.1 放電加工過程 11
2.2.2 放電加工參數 14
2.2.3 放電加工特性 15
2.2.4 放電加工之優缺點 16
2.3 田口式品質工程 17
2.3.1 直交表 18
2.3.2 參數設計與種類 19
2.3.3 變異數及貢獻度分析 22
2.4 灰關聯度分析法 24
2.4.1 灰關聯生成 24
2.4.2 屬性權重之決定---熵測度(Entropy measurement) 25
2.4.3 灰色關聯度之計算 26
2.5 灰關聯度分析結合田口方法與非線性回歸分析 28
3. 實驗設備與方法 29
3.1 實驗設備 29
3.2 實驗方法 34
3.2.1 實驗規劃 34
3.2.2 鎳基合金及電極材料 38
3.3 實驗步驟 40
3.3.1 放電加工實驗 41
4. 結果與討論 43
4.1 田口實驗計畫法與變異數分析 43
4.1.1 ANOVA分析 46
4.1.2 參數最佳化組合 46
4.1.3 增益值及改善率分析 47
4.2 加工參數與特性間之關係 50
4.2.1 加工參數與材料移除率間之關係 50
4.2.2 加工參數及電極消耗率間之關係 53
4.2.3 加工參數及相對電極消耗率間之關係 56
4.2.4 加工參數及表面粗糙度間之關係 59
4.2.5 單一品質之第一階段與第二階段之比較 61
4.3 多重品質特性 64
4.3.1 灰關聯計算 64
4.3.2 關聯度計算(結合田口實驗計畫法) 66
4.4 非線性迴歸 70
4.5 表面完整性觀察 73
4.5.1放電表面及再鑄層微硬度觀察 73
4.5.2 再鑄層(RCL)顯微組織觀察 76
5. 結論 80
參考文獻 82
附錄………………………………………………… 87
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