| 研究生: |
王陳鴻 Chen-Hong Wang |
|---|---|
| 論文名稱: |
加工液中添加Al-Cr混合粉末對工具鋼放電加工特性之影響 |
| 指導教授: |
顏炳華
Biing-Hwa Yan |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 機械工程學系 Department of Mechanical Engineering |
| 畢業學年度: | 88 |
| 語文別: | 中文 |
| 論文頁數: | 131 |
| 中文關鍵詞: | 放電加工 、表面改質 、材料去除率 、表面粗糙度 |
| 相關次數: | 點閱:22 下載:0 |
| 分享至: |
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由於田口方法能在最短的時間、最低的成本與最少的實驗次數下完成參數的最適化,因此實驗中搭配田口實驗計劃法來設計實驗,針對材料去除率、電極消耗率與表面粗糙度三個加工特性來分析,藉此找出最佳放電參數與粉末混合參數的組合。在以田口實驗計劃法所得之最佳放電參數與粉末混合參數,進行混合粉末放電加工特性研究,實驗中針對影響放電加工特性較顯著的參數做進一步的研究分析,最後將表面機械性質與加工表面改質的機制做深入的評估與探討。
實驗結果顯示,經田口法分析後,欲獲得最佳的表面粗糙度,應以正極性加工,搭配較小的電流與脈衝時間,並選擇較小的粉末粒徑為佳。在煤油中添加鋁粉及鉻粉進行放電加工,會由於導電性粉末降低了加工液的絕緣程度,使之增大極間間隙,有助於加工的穩定,因此可提高材料去除速度;再加上導電性粉末所造成的放電能量分散效果,因此可以改善表面粗糙度。較小的粉末粒徑,會由於粒子數較多與重量較輕,而增加其在加工液中的懸浮性,並提高極間架橋的機會,以促進放電分散的進行,如此可獲得較佳的表面粗度。經腐蝕與微硬度測試後發現,由於鉻粉在放電的高溫中擴散滲入工件表面,因此可提升加工表面的耐蝕能力與增加表面硬度。
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