| 研究生: |
游育儒 Yu, Yu-ru |
|---|---|
| 論文名稱: |
銅合金於連續沖模引伸過程分析 A Study on Drawing Processes of Progressive Die for Copper Alloy |
| 指導教授: |
許來興
Hsu, Lai-Hsing |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 機械工程學系碩士在職專班 Department of Mechanical Engineering (on the job class) |
| 論文出版年: | 2007 |
| 畢業學年度: | 95 |
| 語文別: | 中文 |
| 論文頁數: | 114 |
| 中文關鍵詞: | 黃銅 、連續沖模 、引伸 |
| 外文關鍵詞: | Copper Alloy, Progressive Die, Drawing |
| 相關次數: | 點閱:202 下載:3 |
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本文對銅合金C2680 厚度0.8mm材料進行拉伸實驗以及可成形性試驗,以獲取真實材料的機械性質以及成形極限圖,將實驗所得之成形極限圖與K、n、R值代入有限元素分析軟體中,與實際開發的成品喇叭端子之連續沖模料帶作比較。
在模擬上,本文分別使用兩個方式進行模擬,第一個方式為一個接一個沖頭的順序,模擬材料單獨受力時的厚度應變情形,第二個方式是使用接近實際生產時,多沖頭同時加工的情形,材料受到其他道次引伸時的差異,並針對兩個方式的模擬結果與實際料帶厚度比對。得到成形厚度的趨勢接近,但第一個模擬方法在第五道次即出現破裂情形,第二個模擬方法在第四道次即出現破裂情形,造成後續引伸時厚度極速變薄,無法逼近實際值,探究模擬條件,模具形狀參數值的取得誤差最大,為探討各模具參數對成形性的影響,規劃田口實驗做觀察。
最後針對第一道次成形使用田口實驗設計方法進行模擬,得到沖壓行程對成形厚度的影響最大為(63%),其次是模肩r角(21%)及摩擦係數(4%),其他因子影響並不大。
The study reported in this thesis investigated the mechanical properties, the simulation and experiments of forming process of sheet metal of copper alloy (i.e. C2680) with 0.8 mm thickness. Employing tensile testing and forming testing machines, the data of tensile strength and plastic deformation performance (including n value, K value, R value, forming limit diagram-FLD) can be obtained. Those properties are then used to simulate the drawing process of a terminal, connecting component for speakers, by a metal forming analysis software. The analysis results including strain and thickness are compared to the actual data of drawing process of the component using an existing progressive die.
Based on the selected progressive die, two methods are used to simulate the draw forming of the specific component. The first method is progressively punching the shape from the flat strip of copper sheet one by one individual step until the shape of final drawing step is reached. The other method is similar to the real production process with multi-punch that involves the first step to the final step of drawing process. The results of these two simulations are compared with the real strip punched by the progressive die. Although the trend of thickness reduction between simulations and real strip is similar, there are still significant discrepancies of thickness reduction rates. That because there are unreasonable simulation results at fourth and following steps. Since the geometric shape and dimensions of selected progressive die are not uniform, such as the draw radii at drawing steps, the simulation conditions may have differences from the specific die. On the other hand, there are several factors that influence the results of draw forming. The details of the influence factors are worth to be conducted.
To understand the factors that influence the results of draw forming, Taguchi method is used to design a simulation plan to estimate how much contribution of each factor. The analysis results of first step of drawing process concluded that punching stroke contributes 63% to the thickness reduction of strip; draw radii contributes 21%; and friction coefficient contributes 4%; the other factors are very little.
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