Electromagnetic Confinement and Shaping for Plate-Form Part

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 a/(delta) larger than 2,2, the electromagnetic pressure acting on melt can be simply expressed as Pm = B^2/2(mu), and the melt shape would be known only by measuring the distribution of magnetic flux density. As a is small and makes the ratio a/(delta) less 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 o, electromagnetic parameter (mu)(gamma) 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 a, electromagnetic parameter (mu)(gamma) and current frequency f.