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標題: | 電暈引弧火花放電與細線微焊接之研究 The Study of Corona Induced Discharge and Microwelding of Fine Wires |
作者: | Jin-Yi Lin 林進益 |
指導教授: | 廖運炫(Yunn-Shiuan Liao) |
關鍵字: | 微接合,微銲接,電暈,火花放電,電暈引弧放電法, micro joining :micro welding :corona :spark discharge :corona induced discharge method, |
出版年 : | 2010 |
學位: | 博士 |
摘要: | 近年來由於微產品(Micro products)需求量極大,帶動了很多微技術的蓬勃發展,大量應用在如電子、醫療、光學、汽車,航太等各領域。其中有關微接合方面的研究,由於深具挑戰,因此吸引頗多學者專家投入。在微焊接領域中,研究主題大多集中在雷射,超音波及電弧焊等三種技術上,目前尚無法滿足所有微焊需求,於是本論文希望可以尋求其他解決方案。開始先提出一種創新的兩段式放電法,之後成功地實踐在一套自製的實驗平台上,可使電暈起弧(Corona ignited)再引弧火花放電(Induced spark discharge)。為了證實新放電法具備可用性,選擇進行類似於熱電偶(Thermocouples) 細導線的對接,目前完成探討的項目有;提出雙向放電的焊接法、算出理論焊接電流為47mA。另外以有限元素分析軟體進行焊接溫度場模擬,結果與理論電流值相吻合,理論值得到支持論點,可加速選定焊接參數。實際焊接時改裝微焊機台眼模成功對接0.25mm黃銅線,經修正換算獲得實際能量效率為78%。另外為了驗證新焊接方法用在微細焊接上的效果,使用電子顯微鏡尋找製品的微裂縫及孔洞、並進行拉伸強度和微硬度試驗,結果顯示新焊接法的確可獲得良好的焊接品質。本製程最大的特色是設備簡單、造價低廉且操作容易;本研究所提出之數項新方法與探討皆具備了獨特性及創造性,不但為微焊接技術提供一個新選擇,也在微放電加工的應用上,開啟一項有潛力的研究方向。 Micro technologies have been vigorously developed recently on the demand of micro products, which have been widely used in many fields, such as electronic, medical, optical, automotive and aerospace applications. Among which, micro joining is so challenging that lots of researches have involved with. In the field of micro joining, most studies are focused on laser, ultrasonic and arc welding technologies, none of which can satisfy all demands of micro welding. This study presents an innovative two-step discharging technology, performing on a self-made experimental platform, which can ignite the discharge of corona, then followed by spark discharge. In order to make sure if this technology is feasible, thin wire joining experiments, similar the joining of thin conductive wires of thermocouples, have performed. The achievements of the experiments includes presenting a welding technology of double discharging, figuring out theoretical joining current to be 47 mA and energy efficiency to be 78%, modifying the die on the micro welding machine to butt-weld a brass wire of 0.25 mm, etc. In order to testify the effect on micro welding, an electronic microscopy is used to check micro cracks and porosities, and tensile and hardness tests are also provided. The results confirm the excellent quality of the welding. The features of this technology include simple equipped, low cost, and easy to maneuver. A finite element analysis software is also introduced in this study to simulate the welding temperature field, generating energy modified values, which can be used to speed up welding process and improve quality. The technologies and discusses presented in this research are unique and creative, offering choice for the field of micro technology and hopefully opening new tract for applications of micro discharge. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/46935 |
全文授權: | 有償授權 |
顯示於系所單位: | 機械工程學系 |
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