Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第10卷    第z1期    总第100期    1999年10月

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文章编号:1004-0609(1999)s1-0172-05
作用于中小尺寸板状熔体表面电磁压力的分析
沈  军    李建国     傅恒志  苏俊义

(西北工业大学凝固技术国家重点实验室, 西安 710072
西安交通大学, 西安 710049
)

摘 要:     推导了一个适用于中小尺寸板状熔体表面电磁压力的计算公式。该式给出了电磁压力系数 p与板厚a、电流频率f、以及材料的电磁参数μγ之间的准确关系。主要结果如下: (1) 当f,a,以及μγ足够大, 使得板的厚度a与电流集肤厚度δ的比a/δ>2. 2时, 电磁压力系数是一个常数( p=1), 电磁压力可由公式 pm=B2/2μ计算。 (2) 但若fa,以及μγ比较小,使a/δ<2.2,则电磁压力必须由系数 p进行修正。也就是说,电磁压力不仅由熔体表面的磁感应强度 B 决定而且也由板的厚度a,电流频率f,以及材料的电磁参数μγ决定。

 

关键字: 电磁约束成形    电磁压力     磁感应强度

ANALYSIS FOR ELECTROMAGNETIC PRESSURE ON THIN PLATELIKE MELT
Shen Jun, Li Jianguo and Fu Hengzhi  Su Junyi

State Key Laboratory of Solidification Processing, Northwestern Polytechnic University, Xi'an 710072, P. R. China
Xi'an Jiaotong University, Xi'an 710049, P. R. China

Abstract:An equation used to calculate electromagnetic pressure for confining and shaping a platelike melt with small or medium thickness is brought forward. The equation gives a precise relationship between electromagnetic pressure factor p and current frequency f, melt thickness a and electromagnetic parameter μγ. The main results can be summarized as follows: (1) As the f , a, and μγ are large enough, causing the ratio of melt thickness to current skining depth a/δ to be larger than 2.2, the p will be a constant( p=1) and the electromagnetic pressure can be calculated with pm=B2/2μ. (2) As the f, a, and μγ are not large enough, and the ratio a/δ is less than 2.2, the factor p is no longer a constant but changes from 1 to 0 with the decrease of a/δ. In this case, the value of electromagnetic pressure is determined not only by magnetic flux density B but also by the current frequency f, melt thickness a and electromagnetic parameter μγ.

 

Key words: electromagnetic confinement and shaping; electromagnetic pressure; magnetic flux density

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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