研究生: |
黃松全 Sung-Chuan Huang |
---|---|
論文名稱: |
具變異式圓弧角模具於孔凸緣成形加工之研究 A Study on hole-flanging process using dies with variational corner radius |
指導教授: |
吳翼貽
Ye-Ee Wu |
口試委員: |
黃佑民
You-Min Huang 向四海 Su-Hai Hsiang |
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: | 2008 |
畢業學年度: | 96 |
語文別: | 中文 |
論文頁數: | 82 |
中文關鍵詞: | 孔凸緣 、近緣 、變異式圓弧角 |
外文關鍵詞: | hole-flanging, near-edge, variational corner radius |
相關次數: | 點閱:178 下載:2 |
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本論文主要是在對近緣(near-edge)的孔凸緣加工行為進行研究,當一個胚料在靠近料緣處施以孔凸緣加工時,其在孔圓周上所產生的凸緣現象與一般的孔凸緣加工是有所不同的,而本論文中所提出的以具變異式圓弧角的模具來加工的方式正可解決這樣的問題。
本論文係以具變異式圓弧角之模具配合薄殼理論來對孔凸緣加工的凸緣成形高度進行模擬分析,文中共設計了九種不同變異程度的圓弧角模具,其圓弧角之半徑係以由小漸增至大的方式來設計,其中最小的圓弧角半徑值皆為3mm,而其最大的圓弧角半徑值則分別為4mm、5mm、6mm........12mm。利用電腦以這些具不同變異度圓弧角的模具,針對冲壓業界常使用的材料SPCC進行模擬分析,並對模擬所得之數據進行迴歸分析,藉以求得模具圓弧角與凸緣高度的相關性,依此來建立模具圓弧角與凸緣高度之關係式,利用此關係式對業界生產的近緣件產品所產生的孔凸緣高度不均的問題工件進行模具修正,成功地將凸緣高低落差從0.67mm降低至0.16mm,大大減少了76%,此關係式可作為冲壓業者模具設計之重要參考依據。
Large flange height difference along the hole circumference is a common phenomenon occurred in near-edge hole-flanging process. A die with variational corner radius was proposed in this study to solve this problem in practice. A commercially available computer program adopting membrane shell theory and software "PAM-STAMP" was utilized to simulate the flange height behaviour along the hole circumference. Dies with even or variational corner radius were adopted in simulation works.
Simulation results showed that the flange height difference for a die with variational corner radius is 0.16mm in compare with 0.67mm obtained from die with even corner radius. Based on the simulation results, an empirical equation was established between flange height and corner radius of die. Using this emperical equation, a die with variational corner radius was constructed and was put into practice to verity our proposed idea.
Results obtained from this test die do fulfill our expectation. The flange height difference of the work piece produced by the test die is 0.16mm, which is much lower than that 0.67mm produced by original die with even corner radius. In compare with the simulation results, the agreement is very good.
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