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<p>A significant contrast exists between micro-blanking and macro-blanking, particularly in terms of the resulting part quality and metal deformation behavior—both of which are critical for product miniaturization. This study investigates the effects of blank holder force on the fracture length of the blanking surface via fine micro-blanking simulations of 100&#xa0;μm-thick Inconel 718 foils subjected to different pre-aging treatments. The results indicated that the empirical macro-scale formula for blank holder force was found to be inapplicable to pre-aging fine micro-blanking. The fracture length gradually decreases with the increase in blank holder force. The blank holder force required for an optimal micro-blanking surface—characterized by a full burnish length and the absence of a fracture zone—decreased with an increasing volume fraction of the precipitate phase. A modified empirical formula for the blank holder force has been developed, and the feasibility of this formula was validated through fine micro-blanking experiments on pre-aged Inconel 718 superalloy foils. This work provides practical guidance for the selection of forming force in pre-aging fine micro-blanking applications.</p>

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Effect of pre-aging treatment on blank holder force of fine micro-blanking for inconel 718 superalloy foils

  • 期刊论文

  • 发表日期：

    2026年6月27日

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  • Kaisheng Ji,
  • Yanxiong Liu,
  • Wenting Wei,
  • Mengfei Wu,
  • Chao Yang

摘要

A significant contrast exists between micro-blanking and macro-blanking, particularly in terms of the resulting part quality and metal deformation behavior—both of which are critical for product miniaturization. This study investigates the effects of blank holder force on the fracture length of the blanking surface via fine micro-blanking simulations of 100 μm-thick Inconel 718 foils subjected to different pre-aging treatments. The results indicated that the empirical macro-scale formula for blank holder force was found to be inapplicable to pre-aging fine micro-blanking. The fracture length gradually decreases with the increase in blank holder force. The blank holder force required for an optimal micro-blanking surface—characterized by a full burnish length and the absence of a fracture zone—decreased with an increasing volume fraction of the precipitate phase. A modified empirical formula for the blank holder force has been developed, and the feasibility of this formula was validated through fine micro-blanking experiments on pre-aged Inconel 718 superalloy foils. This work provides practical guidance for the selection of forming force in pre-aging fine micro-blanking applications.