研究生: |
林益煒 Yi-wei Lin |
---|---|
論文名稱: |
AZ31鎂合金板材之熱間擠製加工製程及其機械性質之研究 Study on Hot Extrusion Process and Mechanical Property of AZ31 Magnesium Alloy Sheet |
指導教授: |
向四海
Su - Hai Hsiang |
口試委員: |
徐瑞坤
none 黃佑民 none |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 機械工程系 Department of Mechanical Engineering |
論文出版年: | 2005 |
畢業學年度: | 93 |
語文別: | 中文 |
論文頁數: | 97 |
中文關鍵詞: | 擠製 、鎂合金板材 、變速法 |
外文關鍵詞: | Magnesium Alloy Sheet, Multi Speed Method,MSM, Extrusion |
相關次數: | 點閱:243 下載:0 |
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本文主要是研究AZ31鎂合金在三組不同之錐度模(模具半角為20°、30°與40°)下,進行板材熱間擠製加工之成形性及探討製程參數對板材之機械性質的影響。本文中所探討之製程參數包含材料加熱溫度、盛錠筒溫度、擠製初速度與潤滑劑等四項。首先,運用田口式直交表規劃製程參數之組合,以進行擠製比為35.9的板材在錐度模之熱間擠製加工,全部之實驗次數共計二十七次實驗。
此外,AZ31鎂合金板材於錐度模之擠製加工成形性也會在所謂變速之方法(Multi Speed Method,MSM)中被探討。鎂合金為六方緊密堆積的組織結構,由於其滑移系統之滑移面相當有限,若採用固定速度進行擠製加工,其實驗所得之板材皆有缺陷產生,無法獲得良好之板材;然而採用變速之方法進行擠製加工時,即可得到表面良好之健全板材,變速法中調變擠製初速度的時機點之變化,亦會直接影響板材擠製加工的成功與否。
對於擠製成形板材之抗拉強度,以田口法之品質計量法及製程參數之最佳化分析,可以獲得AZ31鎂合金板材在三組錐度模之熱間擠製加工時之最佳製程參數組合。並探討分析材料加熱溫度、擠製初速度與潤滑劑等三項製程參數,對於板材擠製加工成形性及其機械性質之影響。最後觀察成品之金相顯微組織,探討板材在擠製加工中之顯微組織的變化,希望掌握板材擠製加工的各項製程參數與其機械性質的相關性,以期提供鎂合金加工產業界之參考。
In this research, three converging dies (semi angles of die are 20°, 30°, and 40°) are used to investigate the influence of process parameters to the mechanical properties in the hot extrusion of AZ31 magnesium alloy sheets. The process parameters considered in this study are the heating temperature of billet, the temperature of container, the initial speed of extrusion and the lubricant. Orthogonal arrays (L27) is used to arrange the experimental procedures of magnesium alloy sheet extrusion under extrusion ratio 35.9.
In addition, the formability of AZ31 magnesium alloy sheet under converging dies will be investigated by using Multi Speed Method (MSM). Since the microstructure of magnesium alloy is Hexagonal Closed-Packed (HCP), there is only a sliding face in the bottom of the structure. Therefore, if we use fixed speed method to extrude the sheet, it is difficult to deform under room temperature, in contrast, when using Multi Speed Method sound sheet can be yielded. Incidentally, the timing of adjusting initial speed of extrusion also affects the formability in hot extrusion process.
For the purpose of investigating the tensile strength of extruded sheet, the quality measurement and optimal condition analysis of Taguchi Method are used to obtain the optimal conditions of hot extrusion process in AZ31 magnesium alloy sheet. Moreover, the material temperature, the initial speed of extrusion and the lubricant are changed to observe the effect on formability of extrusion process and mechanical property of extruded sheet. Finally, using the Optical Microscope (OM) to observe the variance of microstructure of extruded parts to clarify the relationship between process parameters and mechanical properties of the products.
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