铸型界面换热系数的测定方法研究  

Study on Determination Method of Heat Transfer Coefficients in Mould Interface

作　　者：郝炜[1] 康健[2] 马敏团[1] 黄引平[1] 赵孟舟[1] 雍艺龙[1] 

机构地区：[1]中国船舶重工集团公司第十二研究所 [2]中国船舶重工集团公司

出　　处：《热加工工艺》2007年第21期11-15,共5页Hot Working Technology

摘　　要：为有效提高数值模拟的准确性,通过实测反求法对材料界面换热进行了测定,提出界面间换热是随温度变化的函数值。按照实验方案,在保证测量仪器,仪表精度的基础之上,采用特制热电偶进行了温度场数据的采集工作。通过实测温度场数据、数值模拟与凝固过程中界面换热系数的反向求解相结合的方法,得出铸件/铸型界面间的换热随温度变化的函数值。通过应用ProCAST软件反求模块进行逆运算,确定了现有某铸铁材料与树脂砂铸型材料间的界面换热值。计算结果表明,整个凝固过程中热电偶处的温度模拟结果与实验结果的最大相对误差在±10℃内,数值模拟精度得到了有效的提高,说明了此界面换热测定方法的可行性。In order to improve the accuracy of the numerical simulation effectively,a continuous interfacial heat transfer coefficients （IHTC） model of the variable parameter with the change of temperature was proposed by the methods of actual-measurement and inverse computing. Following the experimental-scheme, using the specific electric thermo-couple, guaranteeing the accuracy of the measuring apparatus, the date of temperature field was gathered. The value of a function between the interfacial heat transfer and the temperature was figured out by manner of the measured data, the finite-element method （FEM）numerical simulation and the inverse computing of the interfacial heat transfer. Using the inverse module of ProCAST software to calculate the IHTC, the interface heat exchange value between a certain cast iron material and resin bonded sand casting material was determined. The results show that the predicted temperature is well agreed with the macrostructure of the cross section of the casting, the maximum deviation is by ＋ 10℃ with respect to the measured temperatures, so the method of actual t an inverse computing is feasible .

关 键 词：实测反求法 数值模拟 界面换热系数 

分 类 号：TG244.3[金属学及工艺—铸造]