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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 蔡曜陽(Yao-Yang Tsai) | |
dc.contributor.author | Ming-Chih Hung | en |
dc.contributor.author | 洪銘志 | zh_TW |
dc.date.accessioned | 2021-06-15T06:20:46Z | - |
dc.date.available | 2010-08-12 | |
dc.date.copyright | 2010-08-12 | |
dc.date.issued | 2010 | |
dc.date.submitted | 2010-08-09 | |
dc.identifier.citation | 1.金屬中心,“2009第三季我國模具產業回顧與展望,”2009.
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/47824 | - |
dc.description.abstract | 在過去半個多世紀以來,放電加工(Electrical Discharge Machining, EDM)克服了傳統切削難以進行成型的材料,在模具製造業是十分重要的一環。然而,在電能與熱能的作用之下,放電加工後的表面常常會產生再鑄層和放電坑,使表面受到影響。本研究欲將金屬粉末放電與電流變拋光做結合,使放電加工成為一種從粗加工到精加工可以一氣呵成的製程,而複合化的關鍵在於加工液的選擇和間隙的操作使用。首先於固定間隙、不同電場下,觀察加工液中粉末的動態;接著透過間隙的調控,了解加工液的電流變效應最大間隙、放電最大間隙,並探討高速旋轉下的抗離心強度。最後進行SKD11的表面拋光,選用載液黏度、粉末種類、電極尺寸、電壓大小、間隙寬度、粉末混合比例等多種參數,對高硬度的SKD11進行拋光,探討加工前後的效益。
以純電流變液而言,實驗結果指出,在電壓300V的情況下,間隙大於300μm時的電流變效應不夠強,經過一小時的拋光也幾乎沒有表面粗糙度的改善;間隙100μm和300μm之間,為純粹的電流變拋光;間隙50μm到100μm之間,電流變效應伴隨放電現象,工件表面上出現微小放電點,但整體而言有變亮和變平的趨勢。而對於添加金屬粉末於電流變液而言,建議使用低黏度載液,以3:1的比例混入澱粉和鎳粉,在電流變鏈狀結構的輔助下,在50μm可以有均勻的粉末放電行為,而在120~150μm則又可進行純電流變拋光。 | zh_TW |
dc.description.abstract | In the past half century, EDM(Electrical Discharge Machining)has overcome
the difficulty of shaping hard-cutting materials, which traditional cutting methods could not accomplish. Hence, it plays a vital role in manufacturing. However, owing to electrical and thermal effect, craters and recast layers often appear on surfaces after machining. In this study, we try to combine powder-EDM and electro-rheological fluid, making EDM to become a much more mature machining, and the key points are dielectric selection and gap controlling. First, behaviors of different powders between a fixed gap are observerd by various voltage. Second, the ER effect critical gap and discharging maximum gap are obtained by controlling gap sizes. Furthermore, critical rotation speed is also discussed. Last, many factors are chosed to proceed SKD11 surface polishing, such as viscosity, powder species and mixed ratios, electrode sizes, voltage values, gap depths. Experiment underwent under 300V. The result shows that ER effect isn’t strong enough when the gap is larger than 300μm, even though the machining time is 1hr, there’s almost no Ra improvement. When the gap is between 100μm and 300μm, it presents an pure ER polishing effect. When the gap is between 50μm and 100μm, ER effect accompanies with discharge, micro discharging points occured on workpiece, but the surface is still lighter and smoother. In all, low viscosity working fluid and mixed ratio 1:1 of starch and Ni are recommanded, the powder EDM could be carried out uniformly when gap is 50μm, and polishing process could be conducted while gap between 120μm and 150μm. | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T06:20:46Z (GMT). No. of bitstreams: 1 ntu-99-R97522712-1.pdf: 5822589 bytes, checksum: 07decd44ae11dd9fc9d2496719760174 (MD5) Previous issue date: 2010 | en |
dc.description.tableofcontents | 致 謝 I
摘 要 III Abstract IV 目 錄 V 圖目錄 VIII 表目錄 XII 第一章 緒論......1 1.1 研究背景......1 1.2 文獻回顧......5 1.2.1 粉末放電......6 1.2.2 電流變液基本特性研究......11 1.2.3 電流變液研磨拋光文獻......14 1.3 研究動機與目的......18 1.4 論文大綱......19 第二章 相關技術理論介紹......20 2.1 放電加工......20 2.1.1 放電加工原理與機制......20 2.1.2 放電加工參數與加工特性......23 2.2 電流變效應......26 2.2.1 電流變效應原理與機制......26 2.2.2 電流變參數與特性......29 第三章 實驗方法與流程......31 3.1 實驗目的......31 3.2 實驗規劃......32 3.3 實驗流程......34 3.4 實驗材料......35 3.4.1 電極材料......35 3.4.2 工件材料......36 3.4.3 載液......36 3.4.4 粉末種類......38 3.5 實驗設備......41 3.5.1 實驗基本設備......41 3.5.2 觀察及量測設備......46 第四章 實驗結果與討論......50 4.1 加工液在電場中的粉末動態觀察......50 4.1.1 純矽油......53 4.1.2 澱粉於#50矽油中......54 4.1.3 氧化鋁於#50矽油中......55 4.1.4 澱粉與氧化鋁(1:1)於#50矽油中......56 4.1.5 鎳粉於#50矽油中......57 4.1.6 澱粉與鎳粉(1:1)於#50矽油中......58 4.1.7 氧化鋁與鎳粉(1:1)於#50矽油中......59 4.2 加工液之操作範圍探討......60 4.2.1 電流變效應最大間隙......62 4.2.2 放電最大間隙......74 4.2.3 抗離心強度......80 4.2.4 電流變鏈狀結構特性......84 4.3 加工前後比較......91 4.3.1 電場大小對於加工的表面粗糙度改善率......92 4.3.2 單種粉末加工液對SKD11加工前後......102 4.3.3 混合粉末加工液對SKD11加工前後......109 第五章 結論與未來展望......116 5.1 結論......116 5.2 未來展望......117 參考文獻......119 | |
dc.language.iso | zh-TW | |
dc.title | 結合鎳粉放電加工與電流變拋光之製程研發 | zh_TW |
dc.title | Development of Ni Powder EDM Combined with Electro-rheological Polishing Process | en |
dc.type | Thesis | |
dc.date.schoolyear | 98-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 廖運炫,石昭明,盧銘詮 | |
dc.subject.keyword | 電流變液,粉末放電,表面改善率, | zh_TW |
dc.subject.keyword | Electro-rheological fluid,powder-mixed dielectric discharge,surface improvement rate, | en |
dc.relation.page | 122 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2010-08-10 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
顯示於系所單位: | 機械工程學系 |
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