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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。
Aluminum alloy microchannel flat tube hot extrusion forming temperature has an important impact on the quality of forming. The flow stress relationship of AA3102 aluminum alloy was studied by Gleeble hot compression test. The constitutive relation was established based on the modified Voce hardening model with linear softening term. Based on this model, a finite element model of micro-channel flat tube extrusion was established by using Qform-Extrusion software platform. The accuracy of the model was verified by comparison with the field production test. Using the validated finite element model and the peak pressure and the product temperature at the outlet of the die hole as the target variables, the simulation simulation orthogonal experiment was carried out. The results show that the peak compressive force increases with the increase of the temperature gradient of the billet, and the peak temperature of the flat tube at the outlet of the die hole increases with the increase of the extrusion speed. Adjusting the extrusion speed can reduce the temperature difference of the flat tube .