Abstract
In progressive slot piercing with a small pitch, the bridge portions between the slots are prone to twisting. The prevention of this issue is difficult even when the blank holding force is increased. In this paper, we applied two-stage piercing to solve this problem. After the first progressive slot piercing, one side of the bridge portion was marginally sheared (i.e., shaved). The twisting defect of the bridge portion was improved by optimally selecting of the cut-off width in the second stage. The results were dependent upon the side sheared in the second stage. The experimental results were subjected to finite element analysis.
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