Journal of the Japan Society for Technology of Plasticity
Online ISSN : 1882-0166
Print ISSN : 0038-1586
ISSN-L : 0038-1586
Influence of Prehole Punching Condition on Formability in Hole Expansion Utilizing Simplified Opposed-Dies Shearing Process
Kohzoh KATOHKazuyoshi KONDOSatoru NAKAMURATohru KAKITATokiyasu YOGOH
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2015 Volume 56 Issue 656 Pages 798-802


This study was aimed at developing a new prehole shearing process to promote excellent formability of the subsequent hole- expansion process for manufacturing automobile wheel disks made of high-tensile-stress steel. A “simplified opposed-dies shearing process” was newly proposed for forming a prehole for the hole-expansion process, since the original opposed-dies shearing process requires relatively complicated tool sets regardless of its excellent properties for hole expansion. As a result of the series of experiments with the simplified opposed-dies shearing process as the prehole forming process for the hole expansion process, the simplified opposed-dies shearing process was found to show an improvement of 0.3 in the expansion ratio over that in the case of the conventional shearing process.

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© 2015 The Japan Society for Technology of Plasticity
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