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 large r than 2.2, the electromagnetic pressure acting on melt can be simply expre ssed as P-m = 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 rati o a/delta less than 2.2, the melt shape and electromagnetic pressure for co nfining and shaping are determined not only by magnetic flux density B but also by melt thickness a, electromagnetic parameter mu gamma and current fr equency f. In this paper, an equation used to calculate electromagnetic pre ssure acting on "thin plate-form melt" is brought forward. The equation giv es a precise relationship between electromagnetic pressure factor p and mel t thickness a, electromagnetic parameter mu gamma and current frequency f.