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<p>A new scheme of electro-permanent magnetic (EPM) assisted punch (EPMAP) drawing is proposed to alleviate the problem of stress concentration at the fillet area of the punch. It’s easily cause cracking in deep drawing. This method embeds magnetic units inside the punch and utilizes magnetic attraction to increase contact area between the sheet metal and the punch during the forming process, namely improving the adhesion of the mold. The generated frictional force can reduce the forming force, ultimately reducing stress concentration in the fillet area of the punch and avoiding cracking. This paper analyzes the novel process from the aspects of strain and thinning rate of the workpiece, and finally conducts experiments on 55&#xa0;mm pre drawn DC06 slab. Under the traditional process, the workpiece continued to be drawn 5.2&#xa0;mm and broke due to excessive thinning rate. While under EPMAP, the workpiece was drawn 37.4&#xa0;mm without obvious defects, and the thinning rate only increased by 2% compared to the pre drawn parts.</p>

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An experimental and theoretical investigation on deep drawing assisted by electro-permanent magnetic punch

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Sicheng He,
  • Siji Qin,
  • Jipeng Pei,
  • Zhicheng Liu,
  • Jiacheng Zhang,
  • Yonggen Sun

摘要

A new scheme of electro-permanent magnetic (EPM) assisted punch (EPMAP) drawing is proposed to alleviate the problem of stress concentration at the fillet area of the punch. It’s easily cause cracking in deep drawing. This method embeds magnetic units inside the punch and utilizes magnetic attraction to increase contact area between the sheet metal and the punch during the forming process, namely improving the adhesion of the mold. The generated frictional force can reduce the forming force, ultimately reducing stress concentration in the fillet area of the punch and avoiding cracking. This paper analyzes the novel process from the aspects of strain and thinning rate of the workpiece, and finally conducts experiments on 55 mm pre drawn DC06 slab. Under the traditional process, the workpiece continued to be drawn 5.2 mm and broke due to excessive thinning rate. While under EPMAP, the workpiece was drawn 37.4 mm without obvious defects, and the thinning rate only increased by 2% compared to the pre drawn parts.