Comparison of Drawability between Warm Forming and Cold Forming of Aluminum 6xxx Alloys
Comparison of Drawability between Warm Forming and Cold Forming of Aluminum 6xxx Alloys
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6xxx铝合金温成形与冷成形的拉深性能比较
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
V. Tunga
中科院分区：
文献类型：
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作者：
Hyunok Kim;R. Hahnlen;T. Feister;V. Tunga
汽车工业对轻量化的多种铝合金（5xxx， 6xxx和7xxx）有很大的兴趣和材料应用。然而，该行业在利用铝合金和需要标准方法方面经历了相当长的开发时间。本文比较了5xxx、6xxx、7xxx铝合金在冷成形和热成形过程中的拉伸性能。建立了热成形试验单元，实时监测和控制铝毛坯在加热、零件转移和冲压过程中的加热和成形温度，进行热成形试验。采用300吨伺服压力机进行冷成形试验，获得最大拉伸度。采用十字形模具对铝的冷成形和热成形拉伸性能进行了比较。不同铝6xxx合金的拉伸性能不同。确定了不同铝合金的热成形工艺窗口。本文还比较了Barlat 2000先进材料屈服函数模型和Hill 48传统模型对成形过程的有限元预测结果。与Hill 48模型相比，Barlat 2000模型对冷成型和热成型实验结果的相关性都优于Hill 48模型。
The automotive industry has significant interests and material applications involving multiple aluminum alloys (5xxx, 6xxx, and 7xxx) for light weighting. However, the industry experiences a rather lengthy development time for utilizing aluminum alloys and the need for standard approaches. This paper compares the drawability of various aluminum 5xxx, 6xxx, and 7xxx alloys among cold forming and warm forming processes. A warm forming (WF) test cell was established to conduct warm forming tests with real-time monitoring and controlling the heating and forming temperatures of aluminum blanks during heating, part transferring and stamping. For cold forming trials, a 300-Ton servo press was used for obtaining the maximum drawability. A cross-form die was used to compare the aluminum drawability between cold and warm forming processes. Increased drawability varied with different aluminum 6xxx alloys. The warm-forming process window was determined for different aluminum alloys. This paper also compares finite element (FE) prediction results of the forming process between advanced material yield function model, Barlat 2000, and a conventional model, Hill 48. The Barlat 2000 model gave a superior correlation to both cold and warm forming experimental results compared with the Hill 48 model.