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http://dx.doi.org/10.3795/KSME-A.2002.26.7.1340

Finite Element Analysis of the Effect of Centering Groove on Tip Test  

Kang, Seong-Hoon (한국과학기술원 기계공학과)
Im, Yong-Taek (한국과학기술원 기계공학과 전산재료성형설계연구실)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.26, no.7, 2002 , pp. 1340-1347 More about this Journal
Abstract
Finite element simulations are being widely used to increase the efficiency and effectiveness of design of bulk metal forming processes. In such simulations, proper consideration of friction condition is crucial in obtaining reliable results. For this purpose, tip test based on backward extrusion was proposed recently. In this lest, a cylindrical billet is positioned in a shallow groove of a counter punch for centering purpose and formation of a radial tip is induced on the extruded end of the workpiece. In this study, the effect of centering groove on tip test was investigated. The quantitative ratio of the shear friction factors between the punch and die was numerically determined depending on the shape of centering groove. Also, surface expansion and pressure distribution along the punch and die were considered in order to better understand the reason that friction condition at the punch compared to the one of die was more severe.
Keywords
Tip Test; Centering Groove; Finite Element Method; Shear Friction Factor; Surface Expansion Ratio; Bulk Metal Forming;
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