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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 1    February 2001

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Effect of coupling between melt shape and
temperature field on electromagnetic shaping
SHEN Jun(沈  军)1, PEI Xin-feng(裴新风)2, HOU Jian-ping(侯建平)1,
LIJian-guo(李建国)1, FU Heng-zhi(傅恒志)1

1. State Key Laboratory of Solidification Processing, Northwestern Polytechnic University,
 Xi′an 710072, P.R.China;
2. Department of Computer Science and Engineering, Northwestern Polytechnic University,
 Xi′an 710072, P.R.China

Abstract:Based on the analyses of electromagnetic pressure on melt and heat induced in melt, the ratio of heat to pressure Q0/pm was defined. It was given that the relationship between Q0/pm and thickness a , electromagnetic parameter μγ of melt and electric current frequency f under electromagnetic confinement and shaping process. If the value of Q0/pm is big, any adjustment on melt shape will easily cause a variation of temperature in melt. In this situation, there appears a more sensitive interaction between shape and temperature field and a more narrow adjustment range for this process. Experiments on some thin plate samples with a crosssection of 6 mm×18 mm  have been done in two kinds of induction coils respectively. The results show that as the coil with a trumpet inside wall is used and the positions of melt top and S/L interface are properly selected, the melt periphery is nearly vertical and the temperature gradient ahead of S/L interface is high. On this condition, a more stable and wider coupling between shape and temperature field has been continuously maintained and samples with smooth surface and unidirectional crystals have been successfully obtained.

 

Key words:  electromagnetic shaping; temperature field; melt shape; coupling

ISSN 1672-7029
CN 43-1423/U

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