Improvement of sheet metal formability by local work-hardening with punch indentation


To improve the formability in stamping, a blank was locally work-hardened by indentation with a punch. Local strength expressed as a product of flow stress and thickness is increased up to a certain punch stroke by indentation, because the influence on the local strength contributed by the flow stress increase is larger than that by the thickness reduction. The effects of the indentation ratio, the number of punches and blank materials on the deformation behaviour in stamping were evaluated. The formability was increased by indenting thinning portions of the blank. The approach is effective for a sheet metal having a high work-hardening exponent such as stainless steel.

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Correspondence to Yohei Abe.

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Abe, Y., Mori, Ki., Maeno, T. et al. Improvement of sheet metal formability by local work-hardening with punch indentation. Prod. Eng. Res. Devel. 13, 589–597 (2019).

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  • Stamping
  • Sheet metal
  • Punch indentation
  • Locally work-hardening