基于有限元分析的铝合金等温挤压工艺设计

常规挤压条件下(推杆速度不变)，热挤压件的微观组织(例如亚晶粒)沿长度方向的分布是不均匀的，为了控制(或减少)这种不均匀性，工业界常采用等温挤压工艺，即挤压过程中根据所测的挤压件表面温度去调整推杆速度或对坯料进行梯度加热，研究了如何使用商用有限元软件去设计推杆速度曲线，并比较等温挤压工艺和常规挤压工艺在挤压载荷、温度以及亚晶粒尺寸分布等方面的不同。

Isothermal extrusion for aluminium alloy extrusion by finite element analysis

The distribution of microstructure (such as subgrain size) in the cross section of the extrudate is non - umiform under the normal extrusion conditions in which the ram velocity is constant. To reduce or eliminate such differences, isothermal extrusion technology was proposed. Two methods are used: adjusting the ram velocity according to the measured extrudate surface temperature or using tapered heated billet. The focus is to design the ram velocity by using commercial finite element program. Differences in terms of load, temperature and subgrain size histories are compared between the isothermal extrusion and the normal extrusion.