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研究生:劉承毅
研究生(外文):Chengyi Liu
論文名稱:改善矽油介電液的放電方法研究
論文名稱(外文):Impooving the Disvantages of Silicone Oil Dielectric in EDM
指導教授:王阿成
指導教授(外文):A Cheng Wang
學位類別:碩士
校院名稱:健行科技大學
系所名稱:機械工程系碩士班
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2017
畢業學年度:106
語文別:中文
論文頁數:57
中文關鍵詞:矽油表面改質半圓形電極
外文關鍵詞:Silicone oilmaterial removal rateelectrode consumption rate
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在工件表面的改性可以實現更高的性能,如耐磨性,增加機械強度和表面平整度,例如,在工件表面上塗覆一層碳化矽(SiC)將可增強耐磨性。而放電加工是表面改質的一種方法,大部分是在介電液裡添粉末,但是粉末放電會有團聚現象及沉澱於底部等問題,會使粉末失去功能,因此,近年開始有人使用矽油作為介電液,原因是矽油不會有粉末團聚或沉澱等問題產生,但矽油黏滯係數較高,容易導致加工時流動性不佳、不穩定、及產生加工屑的堆積現象。所以,本研究設計一個氣壓式往復機構,在加工過程中,氣壓缸會左右推動加工液,並藉由往復運動來增加循環及流動性,達到改善加工堆積的問題。另外,因電極的外形在進行放電時,對加工液的循環效果會有影響,因此,我們使用線切割將紅銅的圓棒電極切割成半圓形電極,然後寬度為棒狀電極直徑的0.5及0.6及0.7倍,並且透過旋轉進行放電加工,來探討半圓形電極的加工特性。
實驗結果顯示雖然往復機構可以增加流動性,但因為矽油黏度太高而材料移除率不高,且在加工過程會讓放電無法順利穩定進行。半圓形電極在加工時可以使介電液的循環較為順暢,加工的材料移除率也比一般電極高20倍,顯示半圓形旋轉電極對於高黏滯性的介電液會有很好的加工效果。
The modification of workpiece surface can achieve higher performances such as wear resistance, increase the mechanical strength, and surface flatness. For example, coating a layer of silicon carbide (sic) on the workpiece surface will enhance wear resistance. The electrical discharge machining is also one of surface modification method, most of the powder mixed in the dielectric liquid. However, the disadvantage of powder discharge will be the phenomenon of agglomeration, and sedimentation at the bottom issue to loss the powder function. Therefore, the solution of above mention issues is to use silicone oil as a dielectric liquid in recent years. The advantage of silicone oil as the liquid dielectric liquid will be no powder agglomeration or precipitation and other issues. But the side effect of silicone oil is higher viscosity coefficient resulting in poor mobility of liquidity, machining instability, and chips accumulation during processing. In this study, a pneumatic reciprocating mechanism was been designed, the pneumatic cylinder will push the dielectric liquid around in the process, and by reciprocating motion to increase the circulation and mobility, and to improve the processing of the accumulation of the problem. In addition, the circulation effect of the dielectric liquid is affected since the shape of the electrode is subjected to the discharge. Therefore, the workpiece of red copper rod electrode was cut into a semicircular electrode by wire cutting; and considering different width sizes of the bar electrode are 0.5, 0.6 and 0.7 times. Then, the semi-circular electrode processing characteristics are investigated through the rotation of the discharge processing.
The experimental results show that the reciprocating mechanism can obviously increase the mobility. However, some issues of EDM with rod electrode had happened which included lower material removal rate, and unstable discharging process due to higher silicone oil viscosity. In the other way, semi-circular electrode in the processing can make the dielectric liquid circulation is more smoothly, the processing of the material removal rate is also higher than the average electrode 20 times. The results showed the semi-circular rotary electrode for high viscosity dielectric fluid will be excellent to improve the machining performance.
目錄
中文摘要…………………………………………………………………………………….i
英文摘要………………………………………………………………………………ii
誌謝 iv
表目錄 vii
圖目錄 viii
符號說明 x
第一章 緒論 1
1.1 前言 1
1.2 研究動機與目的 2
1.3 文獻回顧 3
1.4 論文架構 6
第二章 放電加工基本原理 7
2.1 放電加工介紹 7
2.2 放電加工原理【9】 8
2.2.1. 陽極與陰極的能量分配比率因IP、τon而變化【9】 11
2.2.2. 熱傳導率性質與融點之積(λ˙θm)的大小 【9】 12
2.2.3. 介電液分解生成的碳對陽極部的附著與其保護作用的影響【9】 13
2.3 放電加工參數對放電其影響【9】 14
2.4 放電加工特性【7】 17
第三章 實驗設備與方法 18
3.1 實驗設備 18
3.2 實驗材料準備 27
3.3 矽油介電液加工原理. 33
3.4 實驗流程……………………………………………………………………33
第四章 結果與討論 36
4.1 使用往復機構對放電的影響 36
4.1.1 有無使用往復機構作來觀察材料移除率的差異性……………...…36
4.1.2 使用往復機構時對電極消耗率的差異性觀察…………………...…38
4.1.3 有無使用往復機構的放電波形圖…………………………………...39
4.2 使用往復機構探討電流對脈寬的響 40
4.2.1 探討在矽油放電時不同電流與脈寬的影響………..…..……..…….40
4.2.2 使用矽油介電液來觀察不同電流與脈寬的電極消耗率 41
4.2.3 在矽油放電下不同脈寬與電流對擴孔的影響……………….……..42
4.3 改善矽油放電的方法………….…………………………………….……43
4.3.1 提高轉速對材料移除率的影響...........................................................44
4.3.2 提高轉速對電極消耗率的影響…………………………………...…45
4.4 半圓形電極對放電的影響…………………………………………………46
4.4.1 半圓形電極與900轉一般電極的材料移除率……………………...46
4.4.2 提高半圓形電極的轉速並觀察對放電的影響…………….………..47
4.4.3不同寬度的半圓形電極對放電的影響…………………………………..48
4.5 不同條件下矽油放電的Z軸高度變化探討…………………………..…49
4.5.1 有無往復運動的Z軸的變化..………………………..……….……49
4.5.2 半圓形電極的Z軸高度變化………………………………………..50
第五章 結論 51
5.1 結論 51
5.2 未來展望 53
參考文獻 54
簡 歷 57
1.井上潔,放電加工,黃錦鐘譯,高立圖書有限公司,台北,民國八十七年。
2.王陳鴻,「加工液中添加Al-Cr混和粉末對工具鋼放電加工特性之影響」,國立中央大學,碩士論文,民國89年。
3.林宏彥,「絕緣液中添加鋁粉對線切割放電加工之影響」,國立中央大學,碩士論文,民國93年。
4.洪銘志,「結合鎳粉放電加工與電流變拋光之製程研發」,國立台灣大學,碩士論文,民國99年。
5.袁倫清,「粉末冶金材料的放電堆積現象研究」,清雲科技大學,碩士論文,民國96年。
6.莊嘉文,「粉末運動行為對粉末放電加工特性的影響」,國立台灣大學,碩士論文,民國94年。
7.陳柏勳,「粉末放電加工液對側向放電的加工研究」,清雲科技大學,碩士論文,民國101年。
8.黃韋強、于劍平、陳毅謙、柏立文,「側向放電加工參數對加工表面特性影響之研究」,精密機械與製造技術研討會,A44-01–A44-08頁,2007.5。
9.楊善欽,「側向電極設計與其研究」,清雲科技大學,碩士論文,民國98年。
10.侯詠升,「鉬金屬放電被覆加工之研究」,國立中央大學,碩士論文民國102年。
11.王淳聖,「膠體介電液在放電加工中的特性研究」,健行科技大學,碩士論文,102年。
12.黃品堯,「以矽油為介電液的放電加工特性研究」,健行科技大學,碩士論文,106年。
13.E. Martınez, B. Casas, “Diamond coatings on electrical-discharge machined hardmetals”, Diamond and Related Materials, 12 ,pp. 762–767, March-July 2003.
14.C. Fenggou, Y. Dayong, “The study of high efficiency and intelligent optimization system in EDM sinking process”, Journal of Materials Processing Technology , 149, pp. 83–87, June 2004.
15.I. Puertas, C. J. Luis, “A study on the machining parameters optimisation of electrical discharge machining”, Journal of Materials Processing Technology, 143–144, pp. 521–526, December 2003.
16.H. K. Kansal, S. Singh, P. Kumar, “Effect of Silicon Powder Mixed EDM on Machining Rate of AISI D2 Die Steel”, Journal of Manufacturing Processes, 9 , pp. 13-22, 2007.
17.H. Ramasawmya, L. Blunt,“Effect of EDM process parameters on 3D surface topography”, Journal of Materials Processing Technology, 148 , pp. 155–164, May 2004.
18.I. Puertas, C. J. Luis, L. Álvarez, “Analysis of the influence of EDM parameters on surface quality, MRR and EW of WC–Co”, Journal of Materials Processing Technology 153–154, pp. 1026–1032, November 2004.
19.I. Puertas, C. J. Luis, G. Villa, “Spacing roughness parameters study on the EDM of silicon carbide”, Journal of Materials Processing Technology, 164–165, pp. 1590–1596, May 2005.
20.M.Weck and J. M. Deher, “Analysis and Adaptive Control of EDM Sinking Process Using the Ignition Delay Time and Fall Time as Parameter”, Annals of the CIRP, 41, pp. 243-246, 1992.
21.N.Mohri, M. Suzuki, M. Furuya, A. Kobayashi, ”Electrode wear process in electrical discharge machining”, Annals of the CIRP, 44, pp. 165-168, 1995.
22.O.Ali; C. Can, “An experimental investigation of tool wear in electric discharge machining”, International Journal of Advanced Manufacturing Technology, 27, pp. 488-500, Mar2006.
23.P. M. George, B. K. Raghunath, L. M. Manochac, Ashish M. Warrier, “EDM machining of carbon–carbon composite—a Taguchi approach”, Journal of Materials Processing Technology, 145, pp. 66–71, January 2004.
24.P. Narender Singh, K. Raghukandan , B. C. Pai, “Optimization by Grey relational analysis of EDM parameters on machining Al–10%SiCP composites”, Journal of Materials Processing Technology, 155–156, pp. 1658–1661, November 2004.
25.S. H. Lee, X. P. Li, “Study of the effect of machining parameters on the machining characteristics in electrical discharge machining of tungsten carbide”, Journal of Materials Processing Technology, 115, pp. 344-358, September 2001.
26.Sanjeev Kumar, Uma Batra, “Surface modification of die steel materials by EDM method using tungsten powder-mixed dielectric”, Journal of Materials Processing Technology, 14, pp. 35–40, January 2012.
27.S Singh, S. Maheshwari, P. C. Pandey, “Some investigations into the electric discharge machining of hardened tool steel using different electrode materials”, Journal of Materials Processing Technology, 149, pp. 272–277, June 2004.
28.Y. Y Tsai, T Masuzawa, “An index to evaluate the wear resistance of the electrode in micro-EDM”, Journal of Materials Processing Technology, 149, pp. 304–309, June 2004.
29.Z.L. Wang, Y. Fang, P.N.Wu, W.S.Zhao, K.Cheng, “Surface modification process by electrical discharge machining with a Ti powder green compact electrode”, Journal of Materials Processing Technology, 129, pp. 139–142, October 2002.
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