Springback prediction of TC4 titanium alloy V-bending under hot stamping condition
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Springback prediction of TC4 titanium alloy V-bending under hot stamping condition YANG Xiao-ming(杨晓明)1, DANG Li-ming(党利明)1, WANG Yao-qi(王耀琦)2, ZHOU Jing(周靖)1, 3, WANG Bao-yu(王宝雨)1, 3 1. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Metal Forming Technology Department, AVIC Manufacturing Technology Institute, Beijing 100024, China; 3. Beijing Key Laboratory of Metal Lightweight Forming Manufacturing, Beijing 100083, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: In this paper, the springback of TC4 titanium alloy under hot stamping condition was studied by means of experiment and numerical analysis. Firstly, an analytical model was established to predict the V-shaped springback angle Δα under the stretch-bending conditions. The model took into account of blank holder force, friction, property of the material, thickness of the sheet and the neutral layer shift. Then, the influence of several process parameters on springback was studied by experiment and finite element simulation using a V-shaped stamping tool. In the hot stamping tests, the titanium alloy sheet fractured seriously at room temperature. The titanium alloy has good formability when the initial temperature of the sheet is 750–900 °C. However, the springback angle of formed parts is large and decreases with increasing temperature. The springback angle Δα decreased by 50% from 0.5° to 0.25°, and the angle Δβ decreased by 46.7% from 1.5° to 0.8° when the initial temperature of sheet increased from 750 °C to 900°C. The springback angle of titanium alloy sheet increases gradually with the increase of the punch radius, because of the increase of elastic recovery, the complex distribution of stress, the length of forming region and the decreasing degree of stress. Compared with the simulation results, the analytical model can better predict the springback angle Δα. Key words: titanium alloy; hot stamping; springback; FE modelling; analytical model Cite this article as: YANG Xiao-ming, DANG Li-ming, WANG Yao-qi, ZHOU Jing, WANG Bao-yu. Springback prediction of TC4 titanium alloy V-bending under hot stamping condition [J]. Journal of Central South University, 2020, 27(9): 2578−2591. DOI: https://doi.org/10.1007/s11771-020-4483-y.
1 Introduction Springback of the sheet is the most serious and difficult problem in stamping process, because the shape of stamping parts after springback is related to the whole forming history. Titanium alloy has been extensively used for aerospace and aviation applications because of an attractive combination of
properties such as high specific strength, excellent fracture toughness and good heat/corrosion resistance [1]. TC4 titanium alloy is by far the most popular one among titanium alloys [2]. However, the alloy is difficult to form into a complex part at room temperature due to its poor formability [3]. And the part has poor dimensional precision due to springback. Traditional forming methods of titanium a
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