摘要
An equation used to calculate electromagnetic pressure for confining and shaping a plate-form 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 MX ?The main results can be summarized as follows: ( i )
An equation used to calculate electromagnetic pressure for confining and shaping a plate-form melt with small or medium thickness is brought forward. The equation gives a precise relationship between electromagnetic pressure factorp and current frequencyf, melt thickness a and electromagnetic parameter μγ. The main results can be summarized as follows: (i) As thef, a and μγ are large enough, causing the ratio of melt thickness to current skin deptha/ δ to be larger than 2.2,p will be a constant (p = 1) and the electromagnetic pressure can be calculated withP m =B 2/2μ. (ii) As thef, a, and μγ are not large enough, and the ratioa/ δ is less than 2.2,p is no longer a constant but changes from 1 to 0 with the decrease ofa/δ. In this case, the value of electromagnetic pressure is determined not only by magnetic flux densityB but also by the current frequencyf, melt thickness a and electromagnetic parameter μγ.
