臺灣博碩士論文加值系統

本論文以有限元素軟體ANSYS分析316L不�袗�線材之抽線製程參數，如摩擦係數、模半角、斷面縮減率、平行區長度、後張力等對製程之影響。結果顯示摩擦係數對抽線應力影響甚大，選用摩擦係數μ＝0.03，相當於使用金屬加乳狀物潤滑劑對線材表面精度及降低抽線應力將有相當大的改善；相同的模半角下，抽線應力隨著斷面縮減率的增加而上升，但模面壓力隨著斷面縮減率的增加而下降。適當的模半角約為6°；眼模具有適當平行區長度能有效降低模面壓力；但過長的平行區不僅耗費眼模材料，也不必要的增加了線材表面的摩擦。外加後張力在低於40％抽線應力下有助於模面壓力降低。此外本文也就三道次抽線與單道次抽線製程作比較，三道次抽線製程無論抽線應力、Von Mises剪應力、等效應變及模面壓力分佈，均比單道次抽線製程來的低，故可增加模具壽命，降低生產成本。

關鍵字:抽線, 有限元素法

The purpose of this thesis is to analyze the wire drawing process of 316L stainless steel wire by using the finite element method. Variations of para- meters include semi-die angle, reduction of area, bearing length and back tension. The results show that the coefficient of friction greatly affects the drawing stress. The coefficient of friction, μ＝0.03, which is equivalent to Metal + Emulsion lubricant is suitable for the wire drawing process. The drawing stress increases with the increment of reduction and the die pressure rises with the decrement of reduction. The suitable semi-die angle α is about at 6 degrees. The die with right bearing length can reduce the die pressure availably. The back tension stress superimposed on drawing stress can reduce the die pressure effectively. The results of a 3-pass multipass wire drawing process show that distributions of the Von Mises stress, effective strain and die pressure are lower than those of the single pass process.

keywore: wire drawing, finite element method

中文摘要 Ⅰ
英文摘要 Ⅱ
目錄 Ⅲ
圖目錄 Ⅵ
表目錄 XI
符號說明 XII
第一章 緒論 1
1-1前言 1
1-2文獻回顧 2
1-3研究動機 11
1-4 論文架構 12
第二章 抽線製程及塑性變形理論 14
2-1 抽線製程簡介 14
2-2 抽線的塑性變形理論 25
第三章 研究步驟與方法 28
3-1 有限元素軟體簡介 28
3-2 ANSYS有限元素軟體介紹 30
3-3 分析方法 36
第四章 分析結果說明 39
4-1 摩擦係數的影響 42
4-1-1 摩擦係數對抽線應力變化影響 44
4-1-2 摩擦係數對模面壓力的影響 44
4-1-3 摩擦係數對變形場的變化 45
4-1-4 對等效應變的影響 45
4-2 斷面縮減率的影響 48
4-2-1 斷面縮減率對Von Mises剪應力的影響 48
4-2-2 斷面縮減率對抽線應力的變化影響 48
4-2-3 斷面縮減率對模面壓力的變化影響 52
4-2-4 斷面縮減率對變形場的變化影響 55
4-2-5 斷面縮減率對等效應變的影響 58
4-3 模半角的影響 61
4-3-1 模半角對抽線應力的影響 61
4-3-2 模半角、斷面縮減率及摩擦係對抽線應力的影響 65
4-3-3 模半角對模面壓力的影響 66
4-3-4 不同模半角與斷面減率對模面壓力的影響 67
4-3-5 模半角對等效應變的影響 68
4-4 平行區長度（Bearing Length）的影響 71
4-4-1 平行區長度對抽線應力的影響 71
4-4-2 平行區長度對模面壓力的影響 71
4-4-3 平行區長度對等效應力的影響 75
4-5 後張力（Back Tension）的影響 76
4-5-1 後張力對抽線應力的影響 76
4-5-2 對模面壓力的影響 77
4-5-3 後張力對等效應力的影響 77
4-5-4 後張力對等效應變的影響 77
第五章 三道次抽線模擬結果 81
5-1三道抽線製程的應力分析 82
5-2三道抽線製程的後張力分析 82
5-3 Von Mises剪應力分佈比較 86
5-4模面壓力分析 88
5-5 等效應變分析 89
第六章 結論與建議 93
6-1 結論 93
6-2 建議 94
附錄 95
參考文獻 98

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