磨料噴射技術應用於精微拋光之研究

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姓名

官君宇(Chun-Yu Kuan) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

磨料噴射技術應用於精微拋光之研究
(A Study on Micro Polishing by Abrasive Jet Technology)

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摘要(中)

本研究主要建構出一自動磨料噴射精微拋光系統，並以放電加工後SKD61模具鋼表面作為改善對象，探討磨料噴射精微拋光法對放電表面拋光改善效果。
研究主要分為兩大部分，首先自行組裝自動磨料噴射精微拋光系統，探討磨料噴射精微拋光法的加工特性與系統各參數加工極限，再利用田口實驗計畫法進行實驗規劃，以獲得磨料噴射精微拋光法各參數對表面粗糙度改善率與材料移除量的影響與最佳水準所在。接著由所獲得之最佳參數組合依續探討改變加工時間、加工路徑、初始放電面、添加劑種類、磨料種類與粒徑等加工參數，以追求磨料噴射精微拋光法對放電表面拋光至鏡面改善效果。
實驗結果發現以自行開發之自動磨料噴射精微拋光系統配合田口實驗所獲得之最佳參數組合，可將表面粗糙度1.03μm Ra (7.74μm Rmax)的放電加工面降至0.13μm Ra (0.90μm Rmax)，改善率達87%，且表面呈現近似鏡面反射效果。另外研究亦探討研磨後之工件表面材料特性，發現利用混合SiC 磨粒進行噴射拋光加後之工件具有SiC嵌入表面效應，由EDS 定量分析結果，其表面SiC含量有明顯增加，且表面微硬度亦會增加。

摘要(英)

This research mainly constructs out an automatic abrasive jet system for micro polishing machining, and takes EDMed SKD61 surface as target of improving. The EDMed surface are investigated to improve the surface polishing effect by abrasive jet micro polishing machining (AJMPM) after processing.
The study is divided into two major parts. First, the machining characteristic of AJMPM and the limit of system parameters will be discussed. Then, making use of Taguchi Method to obtain the optimization of manufacturing process parameters for surface roughness improvement and material removal weight on AJMPM. Second, the best combination of parameters is used to continue discussing the different of machining time, machining path, initial surface roughness, kinds of additive, abrasive mesh and kinds of abrasive in turn. Expecting that the EDMed surface can be improved like a mirror after AJMPM.
From the experimental results find that using the best combination of parameters by Taguchi Method on automatic abrasive jet micro polishing system developed by myself, the surface roughness value can drop from 1.03 μmRa to 0.13 μmRa and 7.74 μmRmax to 0.90 μmRmax, the improvement rate up to 87% and the surface is similar to a reflection mirror. Furthermore, studies are also investigated the surface characteristic of workpiece after machining. From EDS quantitative analysis result reveal that using the SiC abrasive after AJMPM, the SiC content on workpiece surface is going to increase obviously and micro hardness of surface will also increase owing to the surface insertion effect (SiC particles).

關鍵字(中)

★ 田口品質工程
★ 表面粗糙度
★ 磨料噴射
★ 拋光
★ 放電加工

關鍵字(英)

★ abrasive jet machining(AJM)
★ polishing
★ electrical discharge machining(EDM)
★ Taguchi Method
★ surface roughness

論文目次

中文摘要i
英文摘要ii
謝誌iii
目錄iv
圖目錄vii
表目錄xi
第一章緒論1
1-1 研究背景1
1-2 研究動機與目的 2
1-3 研究方法5
1-4 論文架構5
第二章文獻回顧7
2.1 放電製程改善探討7
2.2 表面拋光改善探討8
2.3 磨料噴射加工法探討9
2.4 田口實驗計畫法探討11
第三章實驗原理與設備13
3-1 放電加工法基本原理13
3-1-1放電加工材料去除機制14
3-2 磨料噴射加工法基本原理17
3-2-1 磨料噴射加工材料移除機制18
3-3 田口品質工程基本原理19
3-3-1 變異數分析(ANOVA)及F檢定（F-test）23
3.4 實驗設備26
3-4-1 加工設備26
3-4-2 量測觀察設備 29
3-5 實驗材料31
3-5-1 實驗前置準備 32
3-6 實驗流程圖33
第四章自動磨料噴射精微拋光系統之建構34
4-1 系統設計與建構 34
4-2系統性能與加工特性分析37
4-2-1 系統入出口壓力差異37
4-2-2 乾式與濕式加工對表面粗糙度之影響40
4-2-3 磨料噴射精微拋光法應用於不同工件材質加工特性分析 42
4-2-4 不同加工高度對加工面積之影響44
4-3 結論 46
第五章磨料噴射精微拋光法應用於放電表面之改善 47
5-1 實驗條件與實驗規劃47
5-1-1 研究內容49
5-2 結果與討論50
5-2-1 田口品質工程分析最佳參數組合50
5-2-2 ANOVA分析56
5-2-3 驗證實驗58
5-2-4 磨料噴射加工參數對各品質特性之差異比較60
5-3 結論 69
第六章自動磨料噴射精微拋光效果之探討70
6-1 加工時間對表面精微拋光之影響70
6-2 加工路徑對表面精微拋光之影響73
6-3 初始放電面對表面精微拋光之影響76
6-4 添加劑種類對表面精微拋光之影響81
6-5 磨料粒徑對表面精微拋光之影響86
6-6 磨料種類對表面精微拋光之影響89
6-7 表面特性探討93
6-7-1 加工表面成分分析93
6-7-2 微硬度試驗94
6-7-3 腐蝕試驗與再鑄層觀察97
6-7-4 磨料噴射加工法表面鏡面拋光結果 98
6-8 結論 101
第七章總結論 102
參考文獻 103
英文文獻 103
中文文獻 108
個人簡歷 109

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指導教授

顏炳華(Biing-Hwa Yan)

審核日期

2006-7-16

推文