單點增量引伸法以多步驟模式探討AA-1050鋁材圓杯成形之研究

Study on Single Point Incremental Forming of AA-1050 Circular Cup by Using Multi-stage Process

邱冠樺(Kuan-Hua Chiu)

指導教授 ： 蔡哲雄

國立臺北科技大學/機電學院/製造科技研究所/碩士(2012年)

摘要

本文主要是探討單點增量引伸法於鋁合金板材(AA1050)成形之技術，針對圓杯之成形性及成形之極限進行實驗研究；過去的文獻對高傾角的極限之研究，多以深寬比較小的情況為主，本文實驗之例子係以較大之深寬比1：2之圓杯，以多步驟成形的模式來成形傾角較高之成品，探討其圓杯底部之倒圓角限制及表面品質之改善。本文實驗所使用的機台為三軸CNC銑床，主軸裝置成形用的衝頭，在CNC床台上將鋁合金板材固定在自製的夾治具後，執行CNC加工程式，驅動工具頭旋轉及以一定的軌跡使板金成形。成形之刀頭路徑是透過 CAD/CAM軟體產生之步階式刀具路徑。實驗結果顯示本文方法可推測其成形性以及改善成品之幾何誤差和底部的表面品質。

關鍵字

單點增量引伸 ； 多步驟成形法 ； 步階式刀具路徑 ； 成形極限

並列摘要

The paper aims to investigate the aluminum sheet metal (AA1050) forming on the formability and the process limit of circular cup by using single point incremental forming (SPIF) process. The literatures of the previous investigation on high-inclined angle part are mostly in low depth-width ratio, while the paper aims to form a circular cup with a depth-width ratio 1:2 by using multi-stage process to investigate the rounding limit and improve the quality of the cup. In this paper, all experiments were performed on a CNC milling machine in which the experimental sheet metal was appropriately fixed in a special designed clamping fixture mounted on the machine table and the punch tool was installed on the machine spindle. After that, forming operation can be executed by the NC commands generated from the designed tool paths data. The experimental results show that the forming limit can be predicted and the quality of the cup bottom can be improved by using present method.

並列關鍵字

SPIF ； Multi-stage Forming Approach ； Step-type Tool Path ； Process Limit

參考文獻

[12] 黃俊明、吳運明、詹永裕，Unigraphics II模型設計基礎篇，知城數位科技股份有限公司，2002。

[1] J. Verbert, B. Belkassem, C. Henrard, A.M. Habraken, J. Gu, H. Sol, B. Lauwers, J.R. Duflou, "Multi-Step Toolpath Approach to Overcome Forming Limitations in Single Point Incremental Forming," Int J Mater Form, Vol. 1, Suppl. 1, 2008, pp. 1203–1206.

[2] I. Cerro, E. Maidagan, J. Arana, A. Rivero, P.P. Rodr’ıguez, "Theoretical and Experimental Analysis of the Dieless Incremental Sheet Forming Process," Journal of Materials Processing Technology, Vol. 177, 2006, pp. 404–408.

[3] J.R. Duflou, J. Verbert, B. Belkassem, J. Gu, H. Sol, C. Henrard, A.M. Habraken, "Process Window Enhancement for Single Point Incremental Forming through Multi-step Toolpaths," CIRP Annals - Manufacturing Technology, Vol. 57, 2008, pp. 253–256.

[4] S. Matsubara, "A computer numerically controlled dieless incremental forming of a sheet metal," Journal of Engineering Manufacture, Vol. 215, 2001, pp. 959-966.