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由弹簧和橡胶作为弹性元件的压边装置， 其压边力在拉伸过程中由小变大，再由大变小，符合拉伸变形实际要求，较好地解决了起皱和拉裂的质量问题，具有推广价值。
By the spring and rubber as the elastic component of the blank holder, the blank holder force in the stretching process from small to large, and then from big to small, in line with the actual requirements of tensile deformation, the better solution to the wrinkling and cracking Quality problems, with promotional value.