均質化處理對自行車用6061鋁合金擠製成形性之影響研究

邱鴻春(Hong-Chun Chiu)

指導教授 ： 歐炳隆

國立中央大學/工學院/機械工程學系/碩士(2006年)

摘要

本論文主要以6061 (Al-1.06Mg-0.52Si) 鋁合金為實驗材料，探討不同之均質化處理條件，對於6061鋁合金擠型管件加工成自行車手把之成型性與機械強度之影響。達到強度佳、品質穩定具市場競爭力之產品。
實驗分為四部份，第一部份是擠錠做不同溫度之均質化處理及不同之冷卻方式，然後做光學顯微鏡(OM)及微差掃描分析儀(DSC)之觀察；第二部份是熱擠型後不同之冷卻方式，然後做OM及DSC之觀察；第三部份是後段固定之工業製程，包括表面皮膜處理、精抽厚薄管、縮管、彎管成型、固溶處理及人工頂時效處理(T6)；最後做側向彎曲試驗及硬度值量測試驗比較，得到最佳化之成型性與機械強度。
由實驗結果得知，6061鋁合金經480x10H-FC之均質化處理，以預熱450℃擠型後，車手把成型性最差，於精抽時會產生破裂現象；經520℃x3H與550℃x2H之均質化處理，都有不錯之加工成型性，其中又以520℃x3H與550℃x2H之均質化處理，擠型後淬水效果最佳。
機械強度是以550℃x2H-WQ之均質化處理，擠型淬水最佳。所得到之6061鋁合金擠型管，再經車手把成型製程後做T6熱處理，側彎試驗時，變形量最少、硬度值量測最高。

關鍵字

均質化處理 ； 6061鋁合金 ； 擠型

並列摘要

In this thesis, the primary experiment material is AA6061 (Al-1.06Mg-0.52Si), probing different homogenizated parameter, as to that the effect of shaping and mechanical strength by 6061 aluminium alloy extrusion tube fittings process into the bicycle hand bar to reach high strength ,steady quality, and market competitive products.
The experiment is divided into four parts, the first part is to process billet in different homogenizated treatment and cooling ways, then we use the Optics Microscope (OM ) to observate and analyse with Differential Scanning Calorimetry (DSC ); the second part is cooling by different ways after extrusion, we use OM and DSC to analyse ;the third part is the industrial manufacture process with regular back segment, including the saponification of surface is dealt with, different thickness tube of precisely smoke, shrinking tube, bending tube, solid solution, T6 artificial aging. Finally, doing side direction bending test and hardness value amount to compare with the result, and getting the best shaping quality and mechanical strength.
Learning by the experimental result, 6061 aluminium alloy passes the homogenization of 480x10H-FC, driver make shaping of pre-heating after the 450℃extrusion is worst. Driver make shaping would occur phenomenon of breaking when smoke precisely. Through the homogenization of 520℃x3H and 550℃ x2H, they all have good shaping, among them, 520℃x3H and 550℃x2H are the best treatment to quench water result after the extrusion.
The mechanical strength is by the homogenization of 550℃x2H-WQ. It is the best that the extrusion quenches water. The driver of 6061 aluminum alloy does back shaping T6 heat treatment, when it is tested that the side is curved. At least , the value of hardness of deformation amount is examined highest.

並列關鍵字

extrusion ； 6061 aluminum alloy ； homogenization

參考文獻

[4] D.Apelian, S.Shivkumar, G.Sigworth, ” Fundamental Aspects of Heat Treatment of Cast Al-Si-Mg Alloys”, AFS Transactions, pp.727-741

[5] D.W.Pashley, M.H.Jacobs, J.T.Vietz, ”The Basci Processes Affecting Two-step Aging in an Al-Mg-Si Alloy”, Philosophical Magazine, vol.16, pp. 51-76, 1967

[6] G.Thomas, ”The Aging Characteristics of Aluminium Alloys”, Journal of the Institute of Metals, vol.90, pp.57-63, 1961

[14] Yoshio Baba, Akira Takashima, “Influence of Composition on the Two-Stage Aging of Al-Mg-Si Alloys”, Trans JIM, vol.10, pp.196-204, 1969

[15] S.B.Kang, L.Zhen, H.W.Kim, S.T.Lee, “Effect of cold rolling and aging treatment on mechanical property and precipitation behavior in a Al-Mg-Si alloy.,”Materials Science Forum vols.217-222, pp.827-832,1996