不同温度加载模式AZ31镁合金型材张力绕弯成形数值模拟

发布时间：2018-01-22 04:30

本文关键词： 镁合金型材张力绕弯数值模拟温度场　出处：《材料导报》2017年18期 　论文类型：期刊论文

【摘要】：采用三维弹塑性热力耦合有限元法实现了薄壁U形AZ31镁合金型材的温热张力绕弯成形的数值模拟,分析了4种温度加载模式下型材温热张力绕弯成形过程的温度场和应力场的变化。从模具预热、绕弯前温度场均匀化处理、随动热源的添加等方面实现了型材绕弯过程中温度场稳定性的提高。结果表明,绕弯前型材均匀化10s为最佳时间,随动热源的添加及模具的预热均减小了绕弯过程中型材与外界的热交换。分析了不同温度加载模式下型材内外侧等效应力及温度场的变化。模拟结果可以对AZ31镁合金型材张力绕弯成形工艺的优化提供参考。
[Abstract]:Three-dimensional elastoplastic thermo-mechanical coupled finite element method is used to simulate the thermal tension bending forming of thin-walled U-shaped AZ31 magnesium alloy profiles. The changes of temperature field and stress field in the forming process of the profile under four different temperature loading modes were analyzed. The temperature field was homogenized before bending by preheating the die. The stability of the temperature field in the bending process of the profile is improved by adding the following heat source. The results show that the optimum time is 10s for the profile before bending. The addition of the following heat source and the preheating of the die can reduce the heat exchange between the profile and the outside during the bending process. The changes of the equivalent stress and temperature field inside and outside the profile under different temperature loading modes are analyzed. The simulation results can be used to simulate the AZ. The optimization of tensile bending forming process of 31 mg alloy profile is provided as a reference.
【作者单位】：昆明理工大学材料科学与工程学院;中国科学院金属研究所;
【基金】：国家自然科学基金(51305188) 材料成形与模具技术国家重点实验室开放课题研究基金(P2015-12)
【分类号】：TG306
【正文快照】： 0引言材料的轻量化在现代工业结构设计及工程制造行业,尤其在交通运输、航空航天等领域备受关注,轻量化结构可以减少能耗,环保节能[1]。轻量化结构主要包括两方面:第一,选用密度较小的材料,镁合金是轻量化材料的优先选择,其密度比钢材低约78%,其中变形镁合金具有组织性能好的

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