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The relationship between melt shape, electromagnetic pressure and magnetic field is studied for electromagnetic confinement and shaping of plate-form part. The results of experimental observation and theoretical inference can be summarized as follows. As the melt thickness a is large enough, causing the ratio of plate thickness to current theoretic skin depth α/δ larger than 2.2, the electromagnetic pressure acting on melt can be simply expressed as Pm =_(2μ)~(B2), and the melt shape would be known only by measuring the distribution of magnetic flux density. As α is small and makes the ratio α/δless than 2.2, the melt shape and electromagnetic pressure for confining and shaping are determined not only by magnetic flux density B but also by melt thickness a, electromagnetic parameter pry and current frequency f. In this paper, an equation used to calculate electromagnetic pressure acting on “thin plate-form melt” is brought forward. The equation gives a precise relationship between electromagnetic pressure factor p and melt thickness α, electromagnetic parameter μγ and current frequency f.
The relationship between melt shape, electromagnetic pressure and magnetic field is studied for electromagnetic confinement and shaping of plate-form part. The results of experimental observation and theoretical inference can be summarized as follows. As the melt thickness a is large enough, causing the ratio of plate thickness to current theoretic skin depth α / δ larger than 2.2, the electromagnetic pressure acting on melt can be simply expressed as Pm = _ (2μ) ~ (B2), and the melt shape would be known only by measuring the As α is small and makes the ratio α / δless than 2.2, the melt shape and electromagnetic pressure for confining and shaping are determined not only by magnetic flux density B but also by melt thickness a, electromagnetic parameter pry and current frequency f. In this paper, an equation used to calculate electromagnetic pressure acting on “thin plate-form melt ” is brought forward. The equation gives a precise relationship b etween electromagnetic pressure factor p and melt thickness α, electromagnetic parameter μγ and current frequency f.