立式离心铸造液态金属中气泡的运动规律  

Movement of Gas Bubble in Vertical Centrifugal Casting Liquid Metal

作　　者：刘爱辉[1,2] 隋艳伟[3,2] 李邦盛[2] 郭景杰[2] 傅恒志[2] 

机构地区：[1]淮阴工学院机械工程系 [2]哈尔滨工业大学材料科学与工程学院 [3]中国矿业大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2010年第12期1130-1134,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金重点资助项目(50434030)

摘　　要：研究了对立式离心力场下液态金属中,气泡的临界运动直径以及气泡的运动规律,建立了气泡的临界运动直径和运动速度方程,并进行了试验验证。结果表明,在立式离心力场下,临界运动直径随着旋转角速度和离心半径的增加而减小;气泡的运动分解为上浮运动和向心运动,无论是竖直上浮方向还是水平向心方向,气泡开始运动后速度均增大,加速度减小,当阻力和动力相等时,加速度为0,此时运动速度最大,之后速度逐渐减小;气泡的合成速度随着旋转角速度和离心半径的增加而增大,旋转角速度和离心半径越大,气泡运动越快,气孔缺陷的形成越困难。试验结果与理论分析结果相符合。By means of quantitative analysis, critical moving diameter and migration law of the gas bubble in the liquid metal were described theoretically in vertical centrifugal field, and equation of the critical moving diameter and movement velocity on the gas bubble was established and verified through the experiment. The results reveal that in vertical centrifugal field, the critical moving diameter is decreased with increasing in centrifugal angular velocity and radius. Movement velocity of the gas bubble is divided into the rising velocity and the centripetal velocity. With the gas bubble moving, both rising velocity and centripetal velocity are increased with the decrease of acceleration. When the resistance force is equal to the power, the acceleration is zero and the movement velocity reaches maximum value, then it is gradually reduced. The resultant movement velocity of the gas bubble is increased with increasing in the centrifugal angular velocity and radius. The higher the centrifugal angular velocity and radius, the more intensive the migration of gas bubble, so the porosity is more difficult to form. Finally, the experimental result is well in agreement with theoretical analysis.

关 键 词：离心铸造 液态金属 气泡 临界直径 运动规律 

分 类 号：TG249.4[金属学及工艺—铸造]