铝合金微通道扁管热挤压成形数值模拟

发布时间：2018-06-05 18:33

本文选题：微通道扁管 + 铝合金　；参考：《塑性工程学报》2017年05期

【摘要】：铝合金微通道扁管热挤压成形中温度变化对成形质量有重要的影响。通过Gleeble热压缩试验,研究了AA3102铝合金的流变应力关系,并基于带线性软化项的修正的Voce硬化模型建立了该合金的本构关系。基于此模型,利用Qform-Extrusion软件平台建立了微通道扁管挤压成形的有限元模型,并通过与现场生产试验对比验证了模型的准确性。利用验证的有限元模型,以峰值挤压力和模孔出口处产品温度为目标变量,进行了仿真模拟正交试验研究。研究结果表明,峰值挤压力随着坯料温度梯度的增大而增大,模孔出口处扁管峰值温度随着挤压速度的增大而增大,调整挤压速度可以减小扁管温差。
[Abstract]:The change of temperature has an important effect on the forming quality during hot extrusion of aluminum alloy microchannel flat tube. The rheological stress relationship of AA3102 aluminum alloy was studied by Gleeble thermal compression test. The constitutive relation of AA3102 aluminum alloy was established based on the modified Voce hardening model with linear softening term. Based on this model, the finite element model of micro-channel flat tube extrusion forming is established by using Qform-Extrusion software platform, and the accuracy of the model is verified by comparing with the field production test. Using the verified finite element model and taking the peak extrusion pressure and the product temperature at the exit of the die hole as the target variables, the orthogonal simulation experiments were carried out. The results show that the peak extrusion pressure increases with the increase of the temperature gradient of the blank and the peak temperature of the flat tube at the exit of the die hole increases with the increase of the extrusion speed. The temperature difference of the flat tube can be reduced by adjusting the extrusion speed.
【作者单位】：上海交通大学机械动力与工程学院;上海市高效冷却系统工程中心;江苏杭钢精密铝业有限公司;
【基金】：国家自然科学基金资助项目(51575346) 上海市科委标准专项资助项目(16DZ0502701) 上海市自然基金资助项目(15ZR1424100)
【分类号】：TG379

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