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In this paper, several approximate methods are put forword to calculate the limited burring factor through analyzing stress and strain at the edge of the round-hole in the burring process.

这种极限变形程度可用极限翻边系数来描述，即在翻边过程中，翻边系数(K =d0 /Dm，式中d0 、Dm 分别为板料原始孔径和翻边后竖边中径图 1)，不能小于极限翻边系数。目前，在冲压理论中，有关极限翻边系数的理论探讨还很少[1，2 ，3] 。

The process factors are not independent of the gate design, and must be considered in the gate design effort.

工艺因素在浇口设计中不是独立的，而必须考虑浇口的设计效果。