臺灣博碩士論文加值系統

本研究模擬一模二冲打頭機的成形方式，針對頭部大變形的扣件成形於萬能試驗機進行鍛造成形試驗，分別以不同的一冲擠壓衝程探討扁頭扣件成形時的力量反應及成形特性。實驗結果顯示，使用一模二冲打頭機鍛造頭部大變形扣件，於一冲成形時需將凸出模具的胚料完全擠壓成鼓脹形胚料，於二冲成形時方可完全擠壓成所需尺寸的圓形扁頭扣件。

This study is to investigate experimentally the forming characteristics of a large deformation head fastener by simulating the forming mode of one die-two blow heading machine. The forming tests are conducted on a tensile/compression machine. The force response and forming characteristics are investigated experimentally with distinct strokes of the first blow. It is revealed experimentally that, as using the forming mode of one die-two blow to upset forge a large deformation head fastener, the billet has to be completely compressed as barrel shape for the first blow, then, for the second blow, it is possible to completely upset a circular flat-head fastener.

摘要 I
Abstract II
誌謝 III
圖目錄 V
表目錄 VI
數學符號 VII
數學符號 VII
第一章 緒論 1
1.1 前言 1
第二章 冷鍛成形 8
2.1 鍛造 8
2.2 鍛造的特點 8
2.3 鍛造的目的 9
2.4 鍛造的種類 9
第三章 大變形冷鍛成形 12
3.1 一模二冲實驗 12
3.1.1實驗步驟 12
3.2 L = 40mm之胚料成形 13
3.3 L=45mm之胚料成形 15
第四章 結論 33
4.1 一模二冲鍛造成形 33
4.2 建議 33
參考文獻 35

[1]許源泉，「鍛造學-理論與實習」，三民書局，1990。
[2]柯忠和、江益璋，「鍛造」，全華科技圖書，2003。
[3]N. Asnafi, On tool stresses in cold heading of fasteners, Engineering Failure Analysis 6, pp. 321-335, 1999.
[4]C. MacCormack, J. Monaghan, Failure analysis of cold forging dies using FEM, Journal of Materials Processing Technology 117, pp. 209-215, 2001.
[5]G. Maccarini, C. Giardini, G. Pellegrini, and A. Bugini, The influence of die geometry on cold extrusion forging operations: FEM and experimental results, J. Mater. Process. Technol. 27, pp.227-238, 1991.
[6]S. I. Oh, W. T. Wu and J. P. Tang, Simulations of cold forging processes by the DEFORM system, Journal of Materials Processing Technology, 35, pp.357-370, 1992.
[7]Yuichi Nagao, Markus Knoerr and Taylan Altan, Improvement of tool life in cold forging of complex automotive parts, Journal of Materials Processing Technology, 46, pp.73-85, 1994.
[8]李宜哲，陳復國，鍛造模具破壞原因之探討，鍛造季刊，第三卷第四期，67 ~78 頁，1994 年11 月。
[9]N. Venkata Reddy, P. M. Dixit and G. K. Lal, Die Design for Axisaymmetric Extrusion, Journal of Materials Processing Technology, Vol.55, December, pp331-339, 1995.
[10]H. Ou and R. Balendra, Die-elasticity for precision forging of aerofoil sections using finite element simulation, J. of Mater. Process. Technol. 80-81, 144-148, 1998.
[11]劉祥年，超硬合金模具應用常見的幾個問題，機械月刊，第二十五卷第九期，405 ~415 頁，1999 年09 月。
[12]G. A. Lee and Y. T. Im, Finite-element investigation of the wear and elastic deformation of dies in metal forming, Journal of Materials Processing Technology, pp. 123-127, 1999.
[13]Victor Vazquez, Daniel Hanan and Taylan Altan, Tool life in cold Forging-an example of design improvement to increase service life, Journal of Materials Processing Technology, 98, pp. 90-96, 2000.
[14]Victor Vazquez and Taylan Altan, New concepts in die design physical and computer modeling applications, Journal of Materials Processing Technology, 98, pp212-223, 2000.
[15]C. W. Wu and R. Q. Hsu, A universal velocity field for the extrusion of non-axisymmetric rods with non-uniform velocity distribution in the extrusion direction, Journal of Material Processing Technology, Vol.97, pp. 180-185, 2000.
[16]Chun-Yin Wu and Yuan-Chuan Hsu, The influence of die shape on the flow deformation of extrusion forging, Journal of Materials Processing Technology, 124, pp67-76, 2002.
[17]Hae Yong Cho, Gyu Sik Min, Chang Yong Jo, and Myung Han Kim, Process design of the cold forging of a billet by forward and backward extrusion, Journal of Materials Processing Technology, 135, pp375-381, 2003.
[18]Y. G. An and H. Vegter, Analytical and experimental study of frictional behavior in through-thickness compression, Journal of Materials Processing Technology, 160, pp148-155, 2005.
[19]A. Putz Wagner and U. Engel, Improvement of tool life in cold forging by locally optimized surfaces, Journal of Materials Processing Technology 177, pp206-209, 2006.
[20]楊至誠、郭淵源，316不銹鋼螺絲成形之研究，2010精密機械與製造科技研討會，Vol. II, E08, 2010。