Abstract:

This paper proposed a new strategy to optimize the variable BHF. The optimization strategy was based on the analysis of BHF formability window and integrated into FEM code to obtain time or/and spatial optimal BHF that applied on binders. And then a stepped rectangular box of 60 mm drawing height with segmented binders was adopted to validate the optimization strategy. Firstly, constant BHF FEM simulations through careful experimental design were conducted to discover the drawing limit height under maximum constant BHF. Secondly, FEM simulation combining the new BHF optimization strategy was carried out and the optimal profile of variable BHF was determined for both step box and cylinder cup during the whole punch stroke. The result shows this stepped box can be formed successfully using 5754-0 aluminum alloy sheet, while the maximum drawing height under constant BHF is 45mm.

Key words: blank holder force, forming limit, sheet metal forming;aluminum alloy

摘要：

提出了一种可随位置和行程同步优化压边力的新型控制策略，并将其用于不等深铝合金阶梯盒零件的冲压，在零件成形过程中按照优化策略在不同压边圈位置随冲压行程施加最优压边力，使其冲压深度从恒定压边力下的45mm提高到60mm。在多点变压边力压机上的实验验证了这种优化策略的有效性，从而提高了可控压边力技术的鲁棒性和实用性。

关键词: 压边力, 成形极限, 板料成形, 铝合金