宋健,王忠堂,梁海成,等.镁合金壁板压弯成形曲率半径及回弹分析[J].精密成形工程,2025,17(1):51-59.
SONG Jian,WANG Zhongtang,LIANG Haicheng,et al.Curvature Radius and Springback of Magnesium Alloy Panel during Bending Forming[J].Journal of Netshape Forming Engineering,2025,17(1):51-59. |
| 镁合金壁板压弯成形曲率半径及回弹分析 |
| Curvature Radius and Springback of Magnesium Alloy Panel during Bending Forming |
| 投稿时间：2024-05-16 |
| DOI：10.3969/j.issn.1674-6457.2025.01.007 |
| 中文关键词: AZ31 镁合金 壁板 曲率半径 回弹量 |
| 英文关键词: AZ31 magnesium alloy panel curvature radius springback |
| 基金项目:辽宁省应用基础研究计划(2023JH2/101300214) |
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| 摘要点击次数: 56 |
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| 中文摘要: |
| 目的 对镁合金壁板变曲率压弯成形的回弹进行研究，分析壁板曲率半径和回弹量的变化规律，并建立壁板压弯成形几何模型，确定了材料性能参数、压弯成形工艺方案及成形工艺参数。方法 采用数值模拟和实验的研究方法，在压下高度为3、5、7 mm、成形温度为260 ℃条件下进行了筋高比为4∶3和5∶2的网格式壁板变曲率压弯实验。结果 分析了实验过程中的等效应力分布规律，随着压下高度的增大，等效应力最大值增大，当压下高度为5 mm和7 mm时，最大等效应力超过壁板在260 ℃、压下速度为1 mm/s条件下的抗拉强度。随着筋高比逐渐增大，最大等效应力增大。分析了压弯成形工艺参数对镁合金壁板压弯成形回弹量的影响规律，随着压下高度的增大，壁板回弹量增大。随着筋高比的增大，壁板回弹量减小。当壁板所受最大等效应力小于抗拉强度时，筋高比为4∶3壁板的回弹率为45%，筋高比为5∶2壁板的回弹率为30%，回弹率与压下高度无关，保持定值，当最大等效应力超过抗拉强度时，回弹率逐渐降低。分析了镁合金壁板曲率半径与压下高度之间的关系，随着压下高度的增大，壁板曲率半径减小。结论 壁板回弹量模拟值与实验值吻合较好，最大相对误差为6.91%。壁板曲率半径模拟结果与实验结果相吻合，最大相对误差为4.21%。材料性能参数如下:泊松比为0.35，摩擦因数为0.3，质量密度为1.77×10−9 kg/mm3，当成形温度为260 ℃时，弹性模量为29.6 GPa。2种壁板变曲率压弯最佳工艺方案为温度260 ℃，压下高度依次为3、5、7 mm。 |
| 英文摘要: |
| The work aims to study the springback of magnesium alloy panels in bending with variable curvature, analyze the change law of the curvature radius and springback amount of the panels, establish a geometric model of bending, and determine the material property parameters, as well as the process plan and parameters of bending. Using numerical simulation and experimental research methods, two kinds of mesh panels with rib height ratio of 4∶3 and 5∶2 were tested under the conditions of 3 mm, 5 mm and 7 mm in descending order at 260 ℃. The distribution law of the equivalent stress during the experiment was analyzed. The maximum equivalent stress increased with the increase of the pressure height. The maximum equivalent stress at the pressure height of 5 mm and 7 mm exceeded the tensile strength of the panel at the pressure speed of 1 mm/s at 260 ℃. The maximum equivalent stress increased with the increase of the ratio of reinforcement height. The influence of bending parameters on the springback of a magnesium alloy panel was analyzed. The springback of the panel increased with the increase of bending height. With the increase of the ratio of rib height, the rebound of the wall panel decreased. In addition, when the maximum equivalent stress was less than the tensile strength, the rebound rate of the wall panel was 45% when the ratio of reinforcement to height was 4∶3, and 30% when the ratio of reinforcement to height was 5∶2. The rebound rate was a certain value independent of the compressive height, and the rebound rate gradually decreased when the maximum equivalent stress exceeded the tensile strength. The relationship between the curvature radius of a magnesium alloy panel and the buckling height was analyzed. With the increase of buckling height, the buckling radius of magnesium alloy panel decreased. In conclusion, the simulated value of wall panel rebound is in good agreement with the experimental value, and the maximum relative error is 6.91%. The simulation results are in good agreement with the experimental results, and the maximum relative error is 4.21%. The material properties are Poisson ratio 0.35, friction coefficient 0.3, mass density 1.77×10−9 kg/mm3, elastic modulus 29.6 GPa at 260 ℃. For these two types of panels, the optimal bending process is that the temperature is 260 ℃ and the pressure is 3 mm, 5 mm, and 7 mm respectively. |
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