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Development of a simple closed-loop type algorithm for determination of variable blank holder force trajectory and its applications to square cup deep drawing 北山, 哲士 濱野, 智史 山崎, 光悦 90339698 Kitayama, Satoshi Hamano, Satoshi 70110608 Yamazaki, Koetsu In deep drawing, a low blank holder force (BHF) can cause wrinkling, while a high BHF can lead to tearing. In this study, a variable blank holder force (VBHF) approach to deep drawing is employed, and a simple closed-loop type algorithm is developed for the VBHF trajectory. The proposed algorithm is divided into two phases. The objective of the first phase is to check wrinkling and tearing. In this phase, a low BHF is used as the initial BHF, which is then increased to prevent wrinkling while controlling tearing. This phase of the algorithm is terminated when tearing occurs. In numerical simulation, the distance between the die and the blank holder is used to measure wrinkling, and the minimum thickness of the blank is used to determine the tearing. In the second phase of the algorithm, the deviations in thickness of the part are iteratively examined, without neglecting the occurrence of wrinkling. One of the advantages of using VBHF instead of constant BHF is that it reduces the forming energy. The validity of the proposed algorithm is examined comparing numerical simulation and experimental results. Finally, the proposed algorithm is also applied to obtain the segmented VBHF trajectory. © 2010 Satoshi Kitayama et al. 金沢大学理工研究域機械工学系 Hindawi Publishing Corporation 2010-01-01 2017-10-03 eng journal article VoR https://doi.org/10.24517/00010071 http://hdl.handle.net/2297/25760 https://kanazawa-u.repo.nii.ac.jp/records/10084 10.24517/00010071 http://www.hindawi.com/journals/ame/2010/497350.html http://www.scopus.com/inward/record.url?eid=2-s2.0-78349282655&partnerID=40&md5=9c82c201a40726b3c95c6e4d981255d0 https://doi.org/10.1155/2010/497350 1687-8132 Advances in Mechanical Engineering 2010 497350 https://kanazawa-u.repo.nii.ac.jp/record/10084/files/TE-PR-KITAYAMA-S-497350.pdf application/pdf 2.5 MB 2017-10-03