三維面對稱擠製加工問題之有限元素分析

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林欽宏(Qin-Hong Lin ) 查詢紙本館藏

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機械工程研究所

論文名稱

三維面對稱擠製加工問題之有限元素分析

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摘要(中)

本文主要利用有限元素軟體MARC模擬三維面對稱擠製問題，並將模擬結果與張[30]實驗、變分上界限法 (VUB)及傳統上界限法(UB)互做比較，以驗證有限元素法應用於複雜斷面擠製問題的適妥性。
本文於模擬擠製過程中，藉由改變胚料導角及摩擦因子等參數，以探討加工參數改變時，對擠製變形行為及成形所需之擠製力的影響。結果顯示各理論計值在定性上均與實驗有一致的結果，但定量上則與實驗有明顯差異。若以各理論比較時，有限元素解能較VUB及UB解對加工參數改變所產生的效應有較佳的預測。
探究加工參數改變造成理論與實驗在定量上產生的差異，其原因可能為實驗時，胚料導角面刮除胚料與模接觸面的潤滑油造成潤滑劑原有潤滑效果失效所致，故實際的摩擦因子應較環壓試驗所測得值為高。

關鍵字(中)

★ 擠製
★ 有限元素
★ 面對稱

關鍵字(英)

論文目次

摘要Ⅰ
目錄Ⅱ
圖表說明IV
符號說明IX
第一章緒論
1-1 前言......................................1
1-2 文獻回顧..................................2
1-3 研究動機與目的............................7
1-4 本論文主要架構............................8
第二章面對稱擠製問題
2-1 理論分析基本假設..........................9
2-2 模具幾何尺寸..............................9
2-3 胚料材料性質與幾何尺寸....................11
2-2 摩擦條件..................................11
第三章基本理論
3-1 剛塑有限元素之理論推導....................12
3-2 Update Lagrangian Formulation(ULF)介紹....18
3-3 接觸問題之處理............................18
3-1-1 接觸之定義..........................19
3-1-2 接觸面摩擦效應之處理................20
3-4 收斂檢查..................................21
第四章 MARC有限元素軟體的應用
4-1 MARC程式編輯..............................22
4-2 模擬擠製模式的建立........................24
4-2-1 模具外型的建立......................24
4-2-2 網格的建立與元素的選取..............24
4-3 輸入邊界條件
4-3-1 邊界設定............................25
4-3-2 材料設定............................25
4-3-3 可變形體與剛體設定..................26
4-3-4 製程控制............................26
4-4 MARC模擬設定
4-4-1 模式的設定..........................27
4-4-2 接觸之處理程序......................28
4-5 圖形輸出..................................29
第五章結果與討論
5-1 胚料導角對解的影響........................31
5-1-1 變形場解............................32
5-1-2 近似應變分布解......................33
5-1-3 擠製力解............................36
5-2 摩擦對解的影響............................37
5-2-1 變形場解............................37
5-2-2 近似應變分佈解......................38
5-2-3 擠製力解............................38
5-3 胚料導角效應的修正........................39
第六章結論與建議
6-1 結論......................................40
6-2 建議......................................41
參考文獻......................................80
附錄..........................................84

參考文獻

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指導教授

葉維磬(WEI-CHING YEH)

審核日期

2001-7-17

推文