基于蠕变理论与有限元仿真的轨道交通车辆铝合金冲压件滞后回弹研究
张学广1何广忠1方斌1崔琪1邢丰琪2王震2
Time-dependent Springback of Rail Transit Vehicle Al Stamping Parts Based on Creep Theory and FE Simulation
ZHANG XueguangHE GuangzhongFANG BinCUI QiXING FengqiWANG Zhen
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作者信息:1.中车长春轨道客车股份有限公司工程技术中心， 130062， 长春
2.中车长春轨道客车股份有限公司零部件分公司， 130062， 长春
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Affiliation:Engineering Technology Center, CRRC Changchun Railway Vehicles Co., Ltd., 130062, Changchun, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.02.007
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中图分类号/CLCN:U270.4+1; O343
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栏目/Col:研究报告
摘要:
滞后回弹是影响冲压件形状精度的关键因素。针对复杂工况下冲压件滞后回弹的预测与验证问题，提出了一种基于蠕变理论与有限元仿真方法。以轨道交通车辆司机室补强板为例，采用单轴拉伸试验测定了不同应力状态下5083O铝合金材料的蠕变行为，并选用幂函数本构模型进行蠕变参数拟合；采用数值模拟手段分别建立了冲压成形、卸载回弹及滞后回弹的仿真模型，得到了不同阶段的应力演变及形状误差数据；开展了冲压件的成形试验，利用非接触式光学测量设备获取了冲压件静置2周后的滞后回弹量，并与理论结果和仿真结果进行对比。结果表明，仿真结果和试验结果中滞后回弹分布趋势一致，最大误差仅为0069 mm；冲压件的最大滞后回弹量为032 mm，在实际生产中通过局部手工修磨即可满足焊装要求。
Abstracts:
Time-dependent springback is a critical factor affecting the shape accuracy of stamping parts. Aiming at the time-dependent springback prediction and validation of stamping parts under complex working conditions，a method based on creep theory and FE simulation is proposed. Taking railway vehicle reinforcing plate as the research object，the uniaxial tensile test is conducted to obtain the creep behaviors of AL 5083-O under different stress conditions; then, the power function constitutive model is used to fit the creep parameters; finally, simulation models of stamp forming, instantaneous springback and time-dependent are built respectively by means of numerical simulation. As a result, the stress evolution and shape error data in different stages are obtained. On this basis, the forming experiment is implemented. and the noncontact optical measuring equipment is used to measure the time-dependent springback in two weeks, the data are compared with simulation and theoretical results, This research shows that the time-dependent springback distribution trend is consistent with the simulation and the experiment, the maximum error between them is only 0.069 mm. The maximum timedependent springback is 0.32 mm, that could meet the welding requirements with manual grinding in actual production process.
引文 / Ref:
张学广, 何广忠, 方斌, 等. 基于蠕变理论与有限元仿真的轨道交通车辆铝合金冲压件滞后回弹研究. 城市轨道交通研究, 2022, 25(2): 26.
ZHANG Xueguang, HE Guangzhong, FANG Bin, et al. Time-dependent springback of rail transit vehicle Al stamping parts based on creep theory and FE simulation. Urban Mass Transit, 2022, 25(2): 26.
ZHANG Xueguang, HE Guangzhong, FANG Bin, et al. Time-dependent springback of rail transit vehicle Al stamping parts based on creep theory and FE simulation. Urban Mass Transit, 2022, 25(2): 26.
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