| Investigation of Forming Stabilities Criteria in Hot Backward Extrusion of Ti-6Al-4V |
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Jong-Taek Yeom, Nho-Kwang Park, You-Hwan Lee, Tae-Jin Shin, Sang-Mu Hwang, Sung-Suk Hong, In-Ok Shim, Chong-Soo Lee |
1KIMM
2Pohang University of Science And Technology
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| Ti-6Al-4V합금의 열간 후방압출에 대한 성형 안정성 평가모델의 고찰 |
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염종택, 박노광, 이유환, 신태진, 황상무, 홍성석, 심인옥, 이종수 |
1한국기계연구원
2포항공대
3국방과학연구소 |
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| Abstract |
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The metal forming behavior of Ti-6Al-4V tube during hot backward extrusion was investigated with various forming stabilities or instabilities criteria. that is, Ziegler's instability criterion, dynamic materials model(DMM) stability criteria and Rao's instability criterion. These approaches also were coupled to the internal variables generated from FE simulation. In order to validate the reliabilities of three criteria, hot backward extrusions for Ti-6Al-4V tube making were carried out with different backward extrusion designs. The useful model for predicting the forming defects was suggested through the comparison between experimental observations and simulation results. |
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