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研究生:柯盛夫
研究生(外文):Therm-Hoo Ke
論文名稱:板件彎曲成形回彈機制之研究
論文名稱(外文):A study of springback mechanism in the sheet-metal bending process
指導教授:陳復國陳復國引用關係
指導教授(外文):Fuh-Kuo Chen
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:機械工程學研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:158
中文關鍵詞:有限元素法回彈V形彎曲L形彎曲彎曲裕度回彈機制
外文關鍵詞:L-bendingV-Die bendingFEMspringback
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板金彎曲成形主要缺陷為回彈與組裝精度之問題。以有限元素法軟體針對V形與L形彎曲製程進行分析,以瞭解回彈產之機制與影響回彈之製程參數。在回彈改善方面,模擬現有改善回彈方法之成效性,並對現有改善法之回彈機制作個完整的分析。由回彈機制分析可瞭解到改善回彈的關鍵所在,並提出反向彎曲法(Inverse bending method)作為改善法,進行模擬分析與實驗驗證,結果證實反向彎曲法的確有改善回彈之作用。由模擬分析提供反向彎曲法之設計原理,可作為反向彎曲模具之設計準則。在精度研究方面,以彎曲裕度公式為基礎,並考慮長度變化量,對中性軸位置常數作修正,以期得能夠更精準的預估板材長度。而預估板材長度可作為工業界之應用。
The main defects on bending of the sheet-metal forming are springback and accuracy of forming on shape fixation.Analyzing V-die bending and L-bending by using the software of the finite element method to understand the mechanism of bending and the parameters of affecting springback.On the part of reducing springback,research the availability of reducing springback methods on bibliographies and complete the analysis of springback mechanism for them.From the analysis of springback mechanism,we provide a new method on reducing springback-Inverse bending method,and confirm it is feasible.So, the design principle of inverse bending method can be as the reference on die of inverse bending method. On the part of accuracy of forming,based the bend allowance and length of change,modify the neutral axis offset to get more accuracy sheet-metal length before forming which is contributive for the industry.
目錄------------------------------------------------Ⅲ
圖目錄----------------------------------------------Ⅶ
表目錄----------------------------------------------XV

第一章 緒論----------------------------------------01
1.1 板材彎曲加工之簡介--------------------------01
1.2 研究動機與目的------------------------------04
1.3 文獻回顧------------------------------------10
1.4 研究方法與步驟------------------------------21
1.5 論文總覽------------------------------------23

第二章 材料機械性質試驗----------------------------25
2.1 板材特性與合金元素含量之檢定----------------26
2.2 拉伸試驗------------------------------------30
2.2.1 材料機械性質---------------------------31
2.2.2 實驗結果-------------------------------32

第三章 彎曲之特徵與機制分析------------------------36
3.1 材料參數之設定------------------------------37
3.2 V形彎曲之參數與變形機制分析-----------------38
3.2.1 V形彎曲模擬模型------------------------38
3.2.2 V形彎曲之回彈機制分析------------------44
3.2.3 製程參數對回彈之影響-------------------50
3.3 L形彎曲之參數與變形機制分析-----------------56
3.3.1 L形彎曲模擬模型------------------------56
3.3.2 L形彎曲之回彈機制分析------------------60
3.3.3 製程參數對回彈之影響-------------------68
3.5 討論----------------------------------------75

第四章 現有改善法與反向彎曲法之研究----------------76
4.1 現有回彈改善法之歸納與分析------------------76
4.1.1 現有回彈改善法之歸納-------------------76
4.1.2 過量角度變形法之回彈機制分析-----------77
4.1.3 過量變形法之回彈機制分析---------------80
4.1.4 二次-彎曲法之回彈機制分析--------------84
4.2 反向彎曲法之分析----------------------------89
4.2.1反向彎曲法之原理------------------------89
4.2.2 V形彎曲之反向彎曲法模擬----------------91
4.2.3 L形彎曲之反向彎曲法模擬---------------100
4.3 討論---------------------------------------109

第五章 長度變化量與板材長度預測之研究-------------111
5.1 彎曲裕度公式之分析-------------------------111
5.2 V形彎曲之長度變化量機制分析----------------112
5.3 V形彎曲的板材展開長度預估之分析------------120
5.4 L形彎曲之長度變化量機制分析----------------121
5.5 L形彎曲的板材展開長度預估之分析------------130
5.6 討論---------------------------------------131

第六章 彎曲成形有限元素法分析之實驗驗證-----------132
5.1 實驗設備與程序-----------------------------132
5.1.1 實驗設備------------------------------132
5.1.2 V形彎曲實驗程序-----------------------137
5.1.3 L形彎曲實驗程序-----------------------138
5.2 實驗驗證-----------------------------------140
5.2.1 V形彎曲實驗結果-----------------------140
5.2.2 L形彎曲實驗結果-----------------------142
5.2.3 V形彎曲之反向彎曲法實驗驗證-----------147
5.2.4 L形彎曲之反向彎曲法實驗驗證-----------148
5.3 討論---------------------------------------150

第七章 結論---------------------------------------151
參考文獻-------------------------------------------155
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