摘要
本研究針對中鋼公司所產AISI 1018、1022、10B21等盤元線材，應用田口法實驗，探討四個控制因子A(退火溫度)、B(氮氣流量)、C(充氮時間)、D(持溫時間)，對三項品質特性：拉伸強度、晶粒粗大層與脫碳層的影響，並進行盤元退火製程最佳化研究，以獲得最佳化參數組合。 研究結果顯示氮氣流量、充氮時間，對線材的拉伸強度影響顯著，最佳組合B3、C3，即氮氣流量大充氮時間長，而因子D(持溫時間)可做為調整因子，可用以調整線材的拉伸強度至所需的強度，因子A(退火溫度)的影響不顯著，可用以控制成本，而確認實驗亦驗證分析結果。 關鍵字 : 盤元線材，退火處理，田口法實驗。

Abstract This Study is aimed at the annealing treatment of low carbon steel wire coil, AISI 1018, 1022 and 10B21. It is investigated, by using Taguchi experimental method, the influence of four factors, A(annealing temperature), B(the flow rate of nitrogen), C(the filling time of nitrogen), and D(annealing temperature holding time) on three quality characteristic, tensile strength, the depth of grain-growing, and the depth of decarburization. The optimal annealing process is studied as well to gain the optimal parameters of annealing process. It is revealed experimentally that the flow rate of nitrogen and the filling time of nitrogen affect significantly the tensile strength of wire coil. The optimal combination is B3, C3, that is, large flow rate and long filling time of nitrogen. The factor D (annealing temperature holding time) is able to be taken as an adjustment factor, to adjust the tensile strength of wire coil up to the required strength. However, the factor A(annealing temperature) is not significant and used to control the cost. The confirmation experiments are also conducted to confirm the results. Keywords: wire coil, annealing treatment, Taguchi method.

目錄
摘要 ................................................................................................................................ 1
Abstract ........................................................................................................................... 2
誌謝 ................................................................................................................................ 3
目錄 ................................................................................................................................ 4
圖目錄 ............................................................................................................................. 6
表目錄 ............................................................................................................................. 7
符號表 ............................................................................................................................. 8
第一章 緒 論 ................................................................................................................. 9
1.1 前 言 ............................................................................................................... 9
1.2 盤元線材之伸線加工 ................................................................................... 9
1.2.1 盤元線材 ........................................................................................ 10
1.2.2 除鏽 ................................................................................................ 10
1.2.3 伸線 ................................................................................................ 10
1.2.4 退火 ................................................................................................ 13
1.2.5 酸洗 ................................................................................................ 13
1.2.6 粗抽與精抽 .................................................................................... 15
1.3 研究動機與目的 ........................................................................................... 19
1.4 論文架構 ..................................................................................................... 19
第二章 盤元退火處理................................................................................................. 35
2.1 製程退火 ...................................................................................................... 35
2.2 盤元線材退火 ............................................................................................. 35
2.3 盤元退火品質 ............................................................................................. 36
2.3.1 拉伸強度 ........................................................................................ 36
2.3.2 晶粒粗大層 .................................................................................... 36
5
2.3.3 脫碳層 ............................................................................................ 37
第三章 盤元退火實驗設計 ........................................................................................ 40
3.1 控制因子 ..................................................................................................... 40
3.2 實驗設計 ..................................................................................................... 40
3.3 退火品質特性 ............................................................................................. 40
3.4 實驗步驟與方法 ......................................................................................... 41
3.4.1 實驗步驟 ......................................................................................... 41
3.4.2 實驗方法 ......................................................................................... 42
3.5 退火實驗結果 ............................................................................................. 42
第四章 盤元線材退火品質分析 ................................................................................ 51
4.1 拉伸強度 ..................................................................................................... 51
4.2 晶粒粗大層 ................................................................................................. 51
4.3 脫碳層 ......................................................................................................... 52
4.4 最佳化分析 .................................................................................................. 53
4.5 確認實驗 ...................................................................................................... 53
第五章 結論 ................................................................................................................. 61
5.1 拉伸強度 ..................................................................................................... 61
5.2 晶粒粗大層 ................................................................................................. 62
5.3 脫碳層 ......................................................................................................... 62
5.4 退火品質最佳化 ........................................................................................... 62
參考文獻 ....................................................................................................................... 64
作者簡歷 ....................................................................................................................... 66

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