論文

査読有り 国際誌
2019年6月

Finite Element Analysis of Shape Accuracy of Billet Cold-Forged with Stepwise Ram Motion

Mechanical Engineering Journal
  • R. Matsumoto
  • ,
  • T. Kagechika
  • ,
  • H. Utsunomiya

6
3
開始ページ
18-00523
終了ページ
33
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1299/mej.18-00523
出版者・発行元
JSME

Influence of stepwise ram motion, one of practical ram motion controls of servo press, on shape and dimensional accuracies of forged billet was investigated in cold cup forging process by the finite element analysis. In the process with stepwise ram motion, the billet inserted in the container was forged by the punch with upper ram of press, and the punch was operated with repetition of advance and pause modes. Following four stages were analyzed; (i) forging, (ii) removal of the punch from the forged billet, (iii) ejection of the forged billet from the container by the knockout punch and (iv) air cooling of the forged billet. In the analysis, the shape and dimensional changes of the inner wall of the billet during the four stages were investigated with several stepwise ram motions under the same forging duration. It is found that repetition of the punch advance with short stroke reduces heterogeneity of the temperature and stress distributions, so that the shape and dimensional accuracies of the inner wall of the forged billet were improved. The results of the finite element analysis were confirmed to be qualitatively agreed with the results of forging experiment on a link-type servo press.

リンク情報
DOI
https://doi.org/10.1299/mej.18-00523
ID情報
  • DOI : 10.1299/mej.18-00523

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