大型铸钢件热物性参数确定及在凝固模拟中的应用  

Determination and Application of Thermophysical Properties of Heavy Steel Casting for Solidification Simulation

作　　者：李文胜[1] 刘艳[2] 周守航[2] 韩庆礼[2] 张西鹏[2] 石立文 康进武[1] 沈厚发[1] 柳百成[1] 

机构地区：[1]清华大学机械工程系先进成形制造教育部重点实验室,北京100084 [2]中冶京诚工程技术有限公司技术研究院,北京100176 [3]中冶京诚(营口)装备技术有限公司,辽宁营口115000

出　　处：《铸造技术》2010年第11期1393-1395,共3页Foundry Technology

基　　金：国家科技支撑计划课题(2007BAF02B02);国家科技重大专项课题(2009ZX04014-082)

摘　　要：为确定大型铸钢件砂型热物性参数,对17.5t铸钢试件进行了测温实验;将确定后的热物性参数应用于300t快锻机下横梁铸件凝固过程的模拟。结果表明,400℃时,砂型导热系数最小;温度大于600℃时,砂型比热随温度升高而增大的速度减小。优化设计下横梁铸件冷铁及补贴有利于补缩,可防止缩孔缩松。Temperature measurements have been carried out on a 17.5 ton experimental steel casting to determine the thermophysical properties of sand mold for heavy steel castings. The determined thermophysical data are used in the solidification simulation to predict shrinkage porosity in a 300 ton lower cross-head casting of rapid forging press. Results demonstrate that the thermal conductivity of sand mold is the minimum at 400 ℃, while the increase of the specific heat with temperature slows down after 600 ℃. Furthermore, the optimization of chill and padding design leads to desirable feeding which eliminates the shrinkage cavity and porosity of the lower cross-head casting.

关 键 词：大型铸钢件 凝固 数值模拟 热物性参数 

分 类 号：TG260[金属学及工艺—铸造]