以等延伸为前提,按内应力作功等于屈曲起浪应变能的临界条件,导出了规定良好板形区的方程式。联解该方程、轧制力方程和弹跳方程,即可同时求得板形良好的规程变量P_i、 h_i与S_(oi)。 Taking equal extension as the prerequisite, according to the critical stress of internal stress equal to the strain energy of buckling, the formula of well-shaped area is deduced. By solving the equation, the rolling force equation and the bounce equation, we can get the good shape variables P_i, h_i and S_ (oi) simultaneously.