金属电磁铸造无量纲判据数学模型及实验研究  

Establishment and Application of Electromagnetic Dimensionless Number (EMDN) in Electromagnetic Casting

作　　者：王辉[1] 金俊泽[1] 郑贤淑[1] 李廷举[1] 郭志芳[1] 

机构地区：[1]大连理工大学铸造工程研究中心,辽宁大连116023

出　　处：《稀有金属材料与工程》2005年第5期691-695,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(重大项目 59995442);国家自然科学基金资助项目(50270417)

摘　　要：提出了电磁无模成形无量纲数的概念,并从电磁无模成形的基本原理出发推导建立了该无量纲数的数学模型,为判断不同金属实现电磁铸造无模电磁成形的难易程度以及估算金属实现无模电磁成形所必需的电磁参数提供了有用的数学工具。In order to estimate the feasibility to Electromagnetic Casting (EMC) to different metals, the mathematical model of the Electromagnetic Dimensionless Number (EMDN) and its expression have been presented. By the theoretical analysis of the EMDN, it can be concluded that the distinct feasibility of EMC to different metals under the given experimental parameters results from the different physical properties. By discussion of the EMDN application in copper, aluminum, steel and Sn-3%Pb alloy, it can be noticed that: 1) copper, steel and Sn-3%Pb require a higher magnetic intensity than aluminum does to attain EMC; 2) copper, steel and Sn-3%Pb need an approximately equal magnetic intensity about 0.08T similar to 0.1T to achieve EMC and aluminum only needs 0.04T. Experiments were carried out by use of Sn-3%Pb alloy and aluminum and the experimental results agree well with the calculated results, and the veracity of the EMDN has been proved then. Theoretical equation of the EMDN model and the prerequisite to attaining the EMC of a metal is given as follows: xi={2B(0)(2) (.) (1 - e(-root pi f sigma mu) (.t))(2)/rho gt(2) root pi f sigma mu(3) > 10 t <= delta, 2B(0)(2)(1 - 1 / e)(2)/rho g mu t > 10 t > delta.

关 键 词：电磁无模成形 电磁铸造 电磁无量纲数 电磁力 

分 类 号：TG249.9[金属学及工艺—铸造]