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<p>This research paper introduces a new technology called dual-action forming (DAF) to eliminate springback and improve the bottom flatness of advanced high-strength steel (AHSS) sheets grade DP780 and DP980 in U-bending parts for the products with short-bottom plates. The DAF process consists of four steps: (1) clamping the sheet between a punch and a counter punch, (2) U-bending with a constant clamping force, (3) applying a corner bottoming force for gripping the sheet at the corner and reduce the local tensile stress and bending moment at the bent corner, and (4) applying an additional bending force at the bottom plate using the counter punch preventing material flow-in, thereby achieving a flat bottom and near-zero springback through further reduction and reversal of the bending moment. Experimental and FE simulation results using the Yoshida-Uemori model identified optimal force combinations 50 kN corner bottoming and 20 kN counter-punch force that reduced springback from 8.87° to 0.54°. The findings demonstrate that DAF effectively eliminates dimensional inaccuracies while maintaining superior bottom flatness, offering a robust alternative to traditional die-shape compensation.</p>

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Dual-Action Forming for Springback Control for the U-Shaped Products With Short-Bottom Plates of Advanced High-Strength Steel Sheets

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Komgrit Lawanwong,
  • Rittichai Phaoniam,
  • Pichai Janmanee,
  • Takashi Katahira,
  • Ryutaro Hino,
  • Fusahito Yoshida

摘要

This research paper introduces a new technology called dual-action forming (DAF) to eliminate springback and improve the bottom flatness of advanced high-strength steel (AHSS) sheets grade DP780 and DP980 in U-bending parts for the products with short-bottom plates. The DAF process consists of four steps: (1) clamping the sheet between a punch and a counter punch, (2) U-bending with a constant clamping force, (3) applying a corner bottoming force for gripping the sheet at the corner and reduce the local tensile stress and bending moment at the bent corner, and (4) applying an additional bending force at the bottom plate using the counter punch preventing material flow-in, thereby achieving a flat bottom and near-zero springback through further reduction and reversal of the bending moment. Experimental and FE simulation results using the Yoshida-Uemori model identified optimal force combinations 50 kN corner bottoming and 20 kN counter-punch force that reduced springback from 8.87° to 0.54°. The findings demonstrate that DAF effectively eliminates dimensional inaccuracies while maintaining superior bottom flatness, offering a robust alternative to traditional die-shape compensation.