摘要
本文通过分析水平轴离心铸造长／径比小于5的圆筒型铸件的凝固过程，建立了表征铸件凝固过程和二维传热模型．并采用交替陷式差分的方法对离心铸造45#碳钢单材质套筒凝固过程温度场进行了数值计算。结果表明：套筒凝固过程表现为沿径向从靠近模具的铸件外表面层向内表面层、轴向从靠近端盖的铸件层向套筒长度中心部位顺序凝固的特点，模具初温对铸件的凝固速度也有重要的影响。提出减少套筒内表面形成的型腔对外界冷空气的卷吸作用。或在铸件金属浇注完毕后浇注一层低熔点保护渣对保持套筒的这种顺序凝固的特点、以加强最后凝固的内层金属液对外层的补缩作用有一定效果。
The solidification process of horizontal centrifugal casting sleeve is analysed with a two-dimmensional heat transfer model,and the IAD (Interative Alternate Differential) method is used to calculate the temperature profile duriop the solidifying process.The calcula-tion indicates that the solidification proceeds from the mold inner-surface toward the geometric center of the cast sleeve.The initial temperature of mold plays a significant role in the sleeve solidification rate.To benefit from the orderly sequence of solidification so as to insure the quality of sleeves,it is important to diminish the amount of cold air be rolled into the sleeve cavity and to cover the molten metal with lower melting point slag after the mold is filled.
出处
《化工冶金》
CSCD
北大核心
1995年第3期205-211,共7页
关键词
离心铸造
凝固
传热
温度场
数值计算
套筒
Centrifugal cast, Solidification, Heat transfer, Iterative alternate differential,Temperature field, Numerical computation
