多孔性鈦基電極對鋁合金放電加工之研究

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姓名

張育銘(Yu-ming Jhang) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

多孔性鈦基電極對鋁合金放電加工之研究
(A Study on Electrical Discharge Machining Al Alloys by Porous Titanium Electrodes)

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摘要(中)

一般放電加工大多使用實心電極來加工，燒結多孔電極之使用較不普遍。本實驗係藉由三種不同鈦基電極(含實心與多孔)，調整電流大小與衝擊係數對鋁合金做放電加工實驗，探討鋁合金經由不同電極、電流、衝擊係數放電加工後的加工特性、表面與斷面元素分析、斷面硬度等特性。希望在各種參數變化下，以期使材料能快速移除，並在加工過程中使工件表面合金化，產生改質層。
實驗結果得知，使用TiN電極的材料移除率、電極消耗率與表面粗糙度皆最大，Ti(25%TiN)電極皆次之，Ti(6Al4V)電極則最低。經由EDS半定量分析，TiN電極加工後之工件表面與斷面Ti元素含量最多，Ti(25%TiN)電極次之，Ti(6Al4V)電極則最低。另外由XRD繞射儀分析，此三種電極加工後之工件表面皆有碳化鋁(AlC)與碳化鈦(TiC)化合物成分。最後做斷面微硬度量測，比較多孔與實心電極對工件表面改質的效果。可得知多孔鈦基電極加工鋁合金較有表面改質效果，工件表面與橫斷面有較多的Ti元素含量，且可改善鋁合金表面的微硬度特性。

摘要(英)

Most of the general discharge machining process using solid electrodes. The use of sintered porous electrode is less. The experimental by three different titanium-based electrodes (including solid and porous). Adjust the current size and the impact factor of aluminum alloy EDM experiment. Discuss aluminum through the different electrodes, electric current and impact factor after EDM processing characteristics, Surface with cross-section elemental analysis, Cross-section hardness and other characteristics. We hope that changes various parameters to have quickly remove material. And in the processing process, to the surface alloying, produces a modified layer.
The results indicate that using TiN electrode caused material removal rate, electrode wear rate and surface roughness are the largest, Ti (25% TiN) electrodes are the second, Ti (6Al4V) electrode is the lowest. By EDS analysis, With the TiN electrode EDM workpiece surface and the workpiece cross-section of Ti element content are the largest, Ti (25% TiN) electrodes are the second, Ti (6Al4V) electrode is the lowest. Analyzed by the XRD diffraction, The three kinds of electrode EDM workpiece surface have aluminum carbide (AlC) and titanium carbide (TiC) compound ingredients. Finally, Do the cross-section micro-hardness measurements. Compare porous and solid electrodes on the surface modification effect. Porous titanium-based electrodes that can be processed aluminum alloy are more surface modification effects. Surface and cross-sectional have more elements of Ti content. Aluminum surface can improve the characteristics of the micro-hardness.

關鍵字(中)

★ 表面改質
★ 放電加工
★ 多孔電極

關鍵字(英)

★ Surface Modification
★ Porous electrode
★ Electrical discharge machining

論文目次

摘要 i
Abstract ii
誌謝 iii
目錄 iv
圖目錄 vii
表目錄 x
第一章緒論 1
1-1放電加工簡史及其發展 1
1-2研究背景 3
1-3文獻回顧 5
1-4研究方法 7
第二章放電加工原理 8
2-1放電加工之原理 8
2-2放電加工材料去除機制 10
2-3放電加工參數設定及其影響 13
2-4放電加工之特性 18
第三章實驗設備與方法 21
3-1 實驗設備 21
3-1-1 放電加工機 21
3-1-2 超音波洗淨機 22
3-1-3 精密電子天平 23
3-1-4 表面粗糙度儀 23
3-1-5 CNC線切割放電加工機 24
3-1-6 掃描式電子顯微鏡暨EDS系統 24
3-1-7 X光繞射儀 25
3-2 實驗材料 26
3-2-1 工件材料 26
3-2-2工件材料的準備 27
3-2-3 電極材料 28
3-2-4 放電加工液 29
3-3 實驗方法 30
3-4 電極材料代號定義 31
3-5 實驗流程 32
第四章實驗結果與討論 33
4-1 多孔性TiN電極對鋁合金放電加工之探討 33
4-1-1材料移除率與電極消耗率 33
4-1-2表面粗糙度與表面型態 34
4-1-3表面元素分析 37
4-2 比較不同電極對鋁合金之加工特性 41
4-2-1材料移除率與電極消耗率 41
4-2-2表面粗糙度與表面型態 45
4-3 不同電極對鋁合金表面性質之影響 51
4-3-1表面元素分析 51
4-3-2表面X-Ray相分析 60
4-3-3斷面元素分佈 63
4-3-4微硬度分佈 65
第五章結論 66
參考文獻 67
個人簡歷 71

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指導教授

顏炳華(Biing-hwa Yan)

審核日期

2011-7-14

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