摘要
以7004铝合金空心型材为研究对象,根据初始设计方案利用三维建模软件UG建立分流组合模的几何模型,运用基于ALE算法的HyperXtrude虚拟试模软件对铝型材挤压成形过程进行数值模拟,分析了挤压模具的力学行为,并通过实验验证了仿真结果的准确性。以挤压速度、棒料加热温度、挤压筒预热温度、模具预热温度为研究对象,探索各挤压工艺参数对模具力学行为的影响,以达到降低模具受力,进而提高模具寿命的目的。结果表明:随着挤压速度的升高、棒料加热温度的降低以及挤压筒预热温度的降低,模具的最大等效应力逐渐升高;模具预热温度对模具的最大等效应力影响较小。最终,在改进后的挤压工艺参数组合下,上模的最大等效应力为998.4 MPa,下模的最大等效应力为582.7 MPa,均低于H13模具钢的屈服强度,通过挤压实验证明了改进后挤压工艺参数的合理性,可为同类型的铝型材挤压成形提供参考。
For 7004 aluminum alloy hollow profile, the geometric model of shunt combined die was established by 3D modeling software UG according to the initial design scheme, and the extrusion process of aluminum profile was numerically simulated by the HyperXtrude virtual test software based on ALE algorithm. Then, the mechanical behavior of extrusion die was analyzed, and the accuracy of the simulation results was verified by experiments. Furthermore, for extrusion speed, bar heating temperature, extrusion cylinder preheating temperature and die preheating temperature, the influences of the each extrusion process parameter on the mechanical behavior of die were explored, so as to achieve the purpose of reducing the force of die and improving the life of die. The results show that with the increasing of extrusion speed, the decreasing of bar heating temperature and the decreasing of extrusion cylinder preheating temperature, the maximum equivalent stress of die gradually increases, and the die preheating temperature has little effect on the maximum equivalent stress of die. Finally, under the improved combination of extrusion process parameters, the maximum equivalent stress of upper die is 998.4 MPa, and the maximum equivalent stress of lower die is 582.7 MPa, which are both lower than the yield strength of H13 die steel. In addition, the rationality of the improved extrusion process parameters are proved by extrusion experiments, which can provide a reference for the extrusion of the same type of aluminum profile.
作者
刘国勇
郝鹏鹏
万里
Liu Guoyong;Hao Pengpeng;Wan Li(School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China;Xi'an Aerospace Precision Electromechanical Research Institute,Xi'an 710100,China;Guangdong Fenglv Aluminum Co.,Ltd.,Foshan 528133,China)
出处
《锻压技术》
CAS
CSCD
北大核心
2022年第11期179-186,共8页
Forging & Stamping Technology
基金
广东省重点领域研发计划项目(2020B010186002)。
关键词
7004铝合金
挤压模具
挤压工艺参数
力学行为
最大等效应力
7004 aluminum alloy
extrusion die
extrusion process parameters
mechanical behavior
maximum equivalent stress
