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 Aa 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.
摘要
本文通过实验和数值分析的方法, 研究了TC4 钛合金在热冲压条件下的回弹。首先, 建立了拉 弯条件下V 形件回弹角Δα的分析模型。该模型考虑了压边力、摩擦、材料性能、板料厚度和中性层 偏移等因素。然后, 采用V 形冲压模具, 通过试验和有限元模拟研究了不同工艺参数对零件回弹的影 响。在热冲压试验中, 钛合金板在室温下成形出现严重断裂的现象。当板料初始温度为750~900 °C 时, 钛合金具有较好的成形性, 但成形件的回弹角较大, 且随着温度的升高而减小。当板料初始温度 从750 °C 升高到900 °C 时, 回弹角Δα从0.5°减小到0.25°, 减小了50%, 回弹角Δβ从1.5°减小到 0.8°, 减小了46.7%。由于板料弹性恢复的增大, 应力的复杂分布和成形区的长度及应力变化, 导致 钛合金板料的回弹角随着凸模半径的增大而逐渐增大。与仿真结果相比, 分析模型能较好地预测回弹 角Δα的变化。
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Projects(U1564202, 51705018) supported by the National Natural Science Foundation of China; Project supported by the Beijing Laboratory of Modern Transportation Metal Materials and Processing Technology and the Beijing Key Laboratory of Metal Forming Lightweight, China
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The overarching research goals were developed by YANG Xiao-ming, WANG Yao-qi, WANG Bao-yu and ZHOU Jing, and YANG Xiao-ming and DANG Li-ming provided the experimental data, and analyzed the experimental data. YANG Xiao-ming and ZHOU Jing established the predicted model and simulation model. The initial draft of the manuscript was written by YANG Xiao-ming. All authors replied to reviewers & apos; comments and revised the final version.
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YANG Xiao-ming, DANG Li-ming, WANG Yao-qi, ZHOU Jing and WANG Bao-yu declare that they have no conflict of interest.
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Yang, Xm., Dang, Lm., Wang, Yq. et al. Springback prediction of TC4 titanium alloy V-bending under hot stamping condition. J. Cent. South Univ. 27, 2578–2591 (2020). https://doi.org/10.1007/s11771-020-4483-y
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DOI: https://doi.org/10.1007/s11771-020-4483-y