铸造模拟关键热参数的反求优化及应用研究
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摘要
铸造过程数值模拟技术已经得到广泛应用,想要获得准确的模拟结果,就需要输入准确的条件参数。然而,通过实验直接测量条件参数却比较困难,部分条件参数甚至无法直接测量获得。应用DOE设计方法进行重力砂铸凝固模型热物性参数敏感性实验,以实验实测温度曲线作为反算优化的初始输入条件,按热物性参数敏感性由高到低依次用ProCAST铸造模拟软件对数值模型的材料热属性、边界散热参数、界面传热系数等热物性关键参数进行反算优化,并将优化获得的热参数进行凝固模拟验证。结果表明,反算优化后的热参数可以准确匹配实测结果,达到无需直接测量而优化条件参数的目的。
The technology of numerical simulation of casting process has been widely used. In order to obtain accurate simulation results, it is necessary to input accurate conditional parameters. However, it is difficult to measure the conditional parameters directly through experiments, and some of the conditional parameters can not even be obtained by direct measurement. The thermal physical parameter sensitivity test of the gravity sand casting solidification model was carried out by using DOE design method. Taking the experimental measured temperature curve as the initial input condition of the inverse calculation optimization. According to the sensitivity of thermal physical parameters from high to low, the key parameters of thermal properties such as material thermal properties, boundary heat dissipation parameters, interface heat transfer coefficient and so on were optimized by ProCAST casting simulation software, and the thermal parameters obtained by the optimization were simulated and verified. The results show that, the optimized thermal parameters can match the measured results accurately, and the parameters can be optimized without direct measurement.
The technology of numerical simulation of casting process has been widely used. In order to obtain accurate simulation results, it is necessary to input accurate conditional parameters. However, it is difficult to measure the conditional parameters directly through experiments, and some of the conditional parameters can not even be obtained by direct measurement. The thermal physical parameter sensitivity test of the gravity sand casting solidification model was carried out by using DOE design method. Taking the experimental measured temperature curve as the initial input condition of the inverse calculation optimization. According to the sensitivity of thermal physical parameters from high to low, the key parameters of thermal properties such as material thermal properties, boundary heat dissipation parameters, interface heat transfer coefficient and so on were optimized by ProCAST casting simulation software, and the thermal parameters obtained by the optimization were simulated and verified. The results show that, the optimized thermal parameters can match the measured results accurately, and the parameters can be optimized without direct measurement.
引文
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[12]郭志鹏,熊守美,曺尚铉,等.合金材料以及工艺参数对压铸过程中铸件/铸型界面换热系数的影响[J].金属学报,2008,44(4):433-439.
[2]Beck J V,Blackwell B,Haji-Sheikh A.Comparison of some inverse heat conduction methods using experimental data[J].International Journal of Heat and Mass Transfer,1996,39(17):3649-3657.
[3]郭志鹏,熊守美,曹尚炫,等.热传导反算模型的建立及其在求解界面热流过程中的应用[J].金属学报,2007,43(6):607-611.
[4]殷亚军,涂志新,田桥,等.基于反热传导法的消失模铸件/铸型界面传热系数研究[J].特种铸造及有色合金,2018,38(4):391-394.
[5]随大山.铸造凝固过程热传导方向问题参数辨识技术研[D].上海:上海交通大学,2008.
[6]胡汉起.金属凝固原理[M].北京:机械工业出版社,2007.
[7]孔祥谦.有限单元法在传热学中的应用[M].北京:科学出版社,1998.
[8]巫江,宋宏春,李小联,等.基于DOE的注塑成型周期工艺参数优化[J].机械工程师,2011,33(1):86-88.
[9]段家现.基于CAE的电池后盖注塑成型工艺优化[J].塑料,2015,44(5):39-42.
[10]马幼平,许云华.金属凝固原理及技术[M].北京:冶金工业出版社,2008.
[11]闫新飞,李少雨,马文治,等.砂型铸造用型砂热物性参数的研究[J].铸造,2015,64(11):1113-1115.
[12]郭志鹏,熊守美,曺尚铉,等.合金材料以及工艺参数对压铸过程中铸件/铸型界面换热系数的影响[J].金属学报,2008,44(4):433-439.