摘要
压铸作为一种有色金属近净成形制备工艺,具有生产效率高、产品尺寸精确、表面质量好等特点,被广泛应用于汽车、电子及通讯等领域。然而,由于合金熔体高速高压充填型腔,压铸充型及凝固过程极其复杂。综述了国内外压铸过程数值模拟技术的研究进展,阐述了当前压铸充型及卷气缺陷预测采用的模型与求解算法,按照在压室及压铸型腔两个阶段分析了熔体温度场模拟仿真的影响因素,重点论述了界面传热系数对压铸熔体温度场模拟仿真的影响,对比了不同的缩孔缩松缺陷预测判据,分析了压铸模具热平衡及寿命预测模型与方法。针对大型结构件一体化压铸带来的模拟仿真时网格数量及计算规模庞大问题,阐述了网格划分的方法,并总结了仿真效率提升方法。最后指出了当前压铸过程数值模拟研究存在的不足及发展方向。
As a near-net forming process for non-ferrous metal alloys,high pressure die casting(HPDC)process has the advantages of high production efficiency,accurate product size and desirable surface quality,which is widely used in automotive,electronics and communication fields.However,due to the high speed and high pressure of the melt,the mold filling and solidification behaviors during the HPDC process are extremely complicated.The research progress in numerical simulation technology for die casting process at home and abroad were reviewed.The current model and algorithm for mold filling and predicting air entrapment defect in die castings were expounded.According to two stages of shot sleeve and die cavity,the influence factors on temperature field simulation of the melt were investigated,focusing on the interface heat transfer coefficient.Meanwhile,different prediction criteria for shrinkage and porosity defects were compared,and the models and methods of heat balance analysis and life prediction for die-casting moulds were analyzed.Aiming at the problem of large grid quantity and calculation scale during simulation on the integrated die-casting process of large structural parts,the methods of grid division were clarified,and the methods to improve simulation efficiency were summarized.Finally,the shortcomings existed in the current research on numerical simulation for die casting process were pointed out,and future development directions were prospected.
作者
郭俊伟
吴孟武
熊守美
张伟
郭志鹏
Guo Junwei;Wu Mengwu;Xiong Shoumei;Zhang Wei;Guo Zhipeng(Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan University of Technology;School of Materials Science and Engineering,Tsinghua University;Beijing Supreium Technologies Co.,Ltd.)
出处
《特种铸造及有色合金》
CAS
北大核心
2023年第10期1366-1375,共10页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(52275370)
湖北省重点研发计划资助项目(2022BAD100)
湖北隆中实验室开放基金资助项目(2022ZZ-04)。
关键词
压铸
数值模拟
充型
凝固
一体化压铸
Die Casting
Numerical Simulation
Filling
Solidification
Integrated Die-casting
