Basing on the theory of single forming, the mathematical model of progressiveforming of open-seam pipes is established.
在板料单次折弯成形理论的基础上，建立了直缝管筒逐步折弯成形的数学模型。
2
It has been recommended a technology and die of bending ring with analysis of its forming process, using in that of bending ring in progressiveforming die.
介绍一种卷圆工艺和模具，并对模具弯曲成形过程进行了分析，指出该方法可以用于级进模上成形。
3
A description has been made on a structure and principle of progressive die used on a general press for shear, upsetting and automatic feed used for forming small axial parts.