摘要
根据挤压铸造的凝固特点,采用高阶导热偏微分方程有限差分计算模型(FDM格式)进行温度场数值模拟,使用动态孤立多熔池判定法确定熔池位置,采用FEM进行熔池中心位置压力计算。若熔池中心位置的压力已经降至0,封闭在硬壳内的液态金属将在没有压力作用的情况下凝固,并按照重力补缩方式进行补缩。采用孤立熔池等效液面下降法来预测收缩缺陷的形成,模拟结果与实验结果基本吻合。
According to the solidification characteristics in squeeze casting process and the partial differential equations of high thermal conductivity, the calculation model （FDM format） wass used for temperature field numerical simulation; dynamic isolated multi-molten pool judgment method wass used to determine the position of the pool; and FEM wass used to calculate the pressure of pool center. If the pressure of molten pool center downs to 0, liquid metal, closed in the scale, will solidify in the condition of no pressure and with feeding shrinkage in accordance with gravity feeding method. The equivalent liquid surface descending method of isolated molten pool was used to predict the formation of shrinkage defect, the simulation results were very closed to the experimental result.
出处
《铸造技术》
CAS
北大核心
2013年第1期57-60,共4页
Foundry Technology
基金
国家自然科学基金(51204147
51274175
50975263)
科技部国际科技合作项目(2011DFA50520)
山西省回国留学人员科研资助(2011-重点6)
作者简介
葛鸿浩（1969-），浙江台州人，硕士生．研究方向：挤压铸造技术．E-mail：zyh388@sina．com
