超音波振動對引伸加工效應之有限元素分析

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姓名

林建呈(Jian-Cheng Lin) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

超音波振動對引伸加工效應之有限元素分析
(The finite element analysis of deep drawing process by superimposing ultrasonic vibrations.)

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摘要(中)

本文應用有限元套裝軟體MARC分析超音波輔助引伸加工問題。為瞭解MARC軟體應用於引伸加工研究的預測性及適妥性，本文首先利用引伸加工實驗結果比較模擬結果的準確性，並於料片建立粗糙度模型，分別探討成品表面粗糙度狀況、成形所需之沖頭負載以及表面粗糙度狀況對成形力的影響。並於母模加載徑向超音波振動，進而探討超音波震動輔助引伸成形的影響。

摘要(英)

The paper employs MARC software to analyze the behavior of deep drawing assisted by ultrasonic vibration. To understand the abilities of MARC in the prediction and suitability of the behavior in deep drawing, compared with experimental results are applied firstly. Building the roughness model on the outside surface of blanks and discussed the finished situation of surface roughness, the required punch load and the influence of forming load by surface roughness condition. Investigating the influence of forming load by ultrasonic vibration-assisted forming with radial ultrasonic vibration on upper die.

關鍵字(中)

★ 超音波振動
★ 引伸
★ 粗糙度

關鍵字(英)

★ roughness
★ deep drawing
★ ultrasonic vibration

論文目次

摘要-----------------------------------------------i
Abstract------------------------------------------ii
致謝---------------------------------------------iii
目錄----------------------------------------------iv
圖目錄-------------------------------------------vii
表目錄---------------------------------------------x
第一章緒論----------------------------------------1
1.1 前言-------------------------------------------1
1.2 研究目的與動機---------------------------------2
1.3 文獻回顧---------------------------------------3
第二章基本理論-----------------------------------10
2.1 超音波振動降低摩擦力之機制--------------------10
2.2 介面摩擦降低粗糙度之機制----------------------11
2.3 Update Lagrangian Formulation(ULF)理論-------12
2.4　MARC接觸問題的處理---------------------------13
2.4.1 接觸之定義----------------------------------14
2.4.2 接觸之處理程序------------------------------15
2.5摩擦效應之處理---------------------------------16
2.6求解非線性代數方程式的方法---------------------17
第三章 MARC有限元素軟體介紹-----------------------26
3.1基本假設---------------------------------------26
3.2 MARC之架構與各部分功能的介紹------------------27
3.3 MARC應用於超音波引伸問題的設定與操作程序------28
3.3.1 前處理器------------------------------------28
3.3.2 分析器--------------------------------------29
3.3.3 後處理器------------------------------------30
3.4 收斂檢查--------------------------------------30
第四章結果與討論---------------------------------35
4.1 模型的建立與實驗驗證--------------------------35
4.2中心線平均粗糙度計算公式推導-------------------36
4.3粗糙度與接觸比的影響---------------------------38
4.3.1接觸比對成形力之影響-------------------------39
4.3.2粗糙度對成形力之影響-------------------------40
4.4 粗糙度改善率討論------------------------------40
4.4.1局部粗糙度討論 -------------------------------41
4.4.2接觸比對粗糙度的影響-------------------------41
4.4.3母材粗糙度對粗糙度改善率之影響---------------42
4.5超音波振動之參數設置---------------------------42
4.5.1超音波振動降低引伸成形力之影響---------------43
4.5.2等效模型對超音波振動之影響-------------------44
4.5.3超音波振動降低料片內應力效應-----------------45
4.5.4超音波振動對表面粗糙度之影響-----------------45
第五章結論與建議---------------------------------47
5.1結論-------------------------------------------47
5.2建議-------------------------------------------47
參考文獻------------------------------------------49

參考文獻

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指導教授

葉維磬(Wei-Ching Yeh)

審核日期

2011-7-23

推文