The influencing of the factors are obtained. At last, the methods of raising the bulging coefficient are given.
得出了各种因素对胀形系数的影响趋势，最后给出了提高胀形系数的方法。
The strain yield locus of the stress yield criterion was advanced and the strain ellipse method for calculating the limit bulging coefficient was given.
提出应力屈服条件的应变屈服轨迹，给出了复合胀形极限成形系数的解法；
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