The numerical simulation result indicates that the variable blank-holder force can improve the formability of box deep drawing.

模拟结果表明，变压边力控制技术可以显著地改善矩形件的成形性能，增加矩形件的拉深极限。

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Using variable blank holder force can remarkably improve the forming performance, and the limiting drawing ratio would reach 5.0.

采用变压边力可以明显提高板材的冲压性能，极限拉深比将达到5.0。

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The equipment has simple structure, is economical and practical and with variable blank holder force. High-quality complex sheet parts can be produced with this equipment.

该装备具有结构简单、经济实用、可实现变压边力控制等特点，可获得高质量的复杂板料成形件。

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