臺灣博碩士論文加值系統

Sizing Press側壓裁寬製程是以鍛錘鍛壓鋼胚來取代傳統的立軋輥裁寬，改變了以往鋼胚在裁寬時的相對連續變形狀態，使鋼胚在裁寬時的變形變為週期性的進行，雖然這會造成胚邊變形的不連續性，但因其不會受到咬入角的限制而影響裁減量，所以可提高每一道次的裁減量，有效的提高裁寬效率，減少軋製道次。而將有限元素法應用於軋製過程的理論研究及製程分析上不但可以節省實驗費用，而且因其高速性和可靠性可以對軋製過程中不易進行實驗研究的問題進行深入的探討，並進行相當準確的預測。本研究主要就是利用熱軋現場實際的製程參數搭配Gleeble動態冶金模擬試驗機所得出之材料流變曲線，運用ABAQUS建立並修正Sizing Press側壓裁寬熱加工模型來探討Sizing Press側壓裁寬後之外觀輪廓，觀察鋼胚前端的挫曲現象，並探討應力應變之分布，依據最大剪應力準則來探討使用Sizing Press 裁寬製程是否能有效減少邊緣缺陷的產生，進一步可找出最佳製程條件參數，增加生產效率，以消除軋製缺陷為最終目標。

Sizing press is a slab reduction process, which is using die reduction to replace traditional horizontal rolling reduction. It changes the relative continuous deformation of slab during reduction, to let deformation of slab during reduction become periodic deformation. Although this will result in discontinuity of deformation on slab edge, however, angle of bite will not be an issue to reduction. Therefore, we can raise reduction of each step, increase reduction efficiency and hence reduce steps.

Using finite element method in theoretical research of reduction process can not only save experimental cost but also study the critical issue which is not reachable during real process due to its reliability and high speed. In this study, we mainly use realistic parameters of CSC to obtain flow curve of materials by Gleeble 1500. Then we use ABAQUS to built models of sizing press process and discuss contours after reduction. Also, we examine the buckling in the front end of slab and discuss the distribution of stress/strain.

According to maximum shear criterion, we discuss whether sizing press process can efficiently reduce edge defects and further find the optimum parameters for the process, and hence increase yield rate.

摘要 I
英文摘要 Ⅱ
致謝 Ⅲ
目錄 Ⅳ
表目錄 Ⅶ
圖目錄 Ⅷ
第一章 緒論 1
1-1 前言 1
1-2 文獻回顧 4
1-2-1 有限元素法應用於金屬成形之相關研究 4
1-2-2 軋延製程之相關研究 7
1-2-3 Sizing Press側壓裁寬製程相關研究 8
1-2-4 軋延缺陷及塑性挫曲之相關研究 11
1-3 研究動機與目的 16
第二章 塑性加工理論與Sizing Press側壓裁寬製程介紹 18
2-1 塑性加工理論 18
2-1-1 塑性力學基礎 19
2-1-2 塑性變形之應力-應變之關係 22
2-1-3 材料降伏準則之比較 24
2-2 Sizing Press側壓裁寬製程介紹 25
2-2-1 Sizing Press側壓裁寬流程 25
2-2-2 Sizing Press側壓裁寬機之幾何關係 27
2-2-3 軋延量的計算 28
2-3 金屬成形有限元素基本理論 28
2-3-1 顯式積分法 30
2-3-2 隱式積分法 31
第三章 研究方法與實驗步驟 33
3-1 研究步驟 33
3-2 研究流程圖 35
3-3 實驗設備 36
3-3-1 Gleeble 1500動態模擬試驗機 36
3-3-2 Gleeble鍛粗試片 38
3-4 實驗方法 40
3-5 實驗規劃 41
第四章 數值模擬軟體及分析方法 42
4-1 數值模擬軟體 42
4-2 數值模擬的方法與假設 42
4-2-1 Sizing Press裁寬側壓機之數值模擬 43
第五章 結果與討論 51
5-1 Gleeble鍛粗試驗 51
5-1-1 Gleeble鍛粗試驗之外觀結果 51
5-1-2 SAE1016低碳鋼之高溫流變曲線 54
5-2 考慮塑性挫曲之Sizing Press裁寬壓力機模型 57
5-2-1 不同寬度不同裁減量裁減後鋼胚外型輪廓的探討 57
5-3 加入壓制輥之Sizing Press裁寬壓力機模型 64
5-3-1 壓制輥之基本介紹 64
5-3-2 依力量歷程來控制上壓制輥 65
5-4 加入壓制輥後不同咬入深度對鋼胚裁寬後之影響 68
5-4-1 不同咬入深度對鋼胚裁寬後外型輪廓之影響 68
5-4-2 不同咬入深度對鋼胚裁寬後應力應變分佈之影響 75
5-5 加入壓制輥後不同裁減量對鋼胚裁寬後之影響 80
5-5-1 不同裁減量對鋼胚裁寬後外型輪廓之影響 80
5-5-2 不同裁減量對鋼胚裁寬後應力應變分佈之影響 85
5-6 經Sizing Press裁寬以及一次平軋後鋼胚變形行為之探討 89
5-6-1 經Sizing Press裁寬及平軋後鋼胚外型輪廓之變化 89
5-6-2 經Sizing Press裁寬及平軋後鋼胚應力應變之分佈 94
第六章 結論與未來研究方向 98
6-1 結論 98
6-2 未來研究方向 101
參考文獻 102
作者簡介 107

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