Fabrication of micro-punch array by plasma printing for micro-embossing into copper substrates

Tomomi Shiratori*, Tatsuhiko Aizawa, Yasuo Saito, Kuniaki Dohda

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Copper substrates were wrought to have micro-grooves for packaging by micro-stamping with use of a AISI316 stainless steel micro-punch array. The micro-texture of this arrayed punch was first tailored and compiled into CAD data. A screen film was prepared to have the tailored micro-pattern in correspondence to the CAD data. A negative pattern to this screen was printed directly onto the AISI316 die substrate. This substrate was plasma nitrided at 673 K for 14.4 ks. The unprinted die surfaces were selectively nitrogen super-saturated to have sufficiently high corrosion toughness and hardness; other surfaces were masked by the prints. The two-dimensional micro-pattern on the screen was transformed into a three-dimensional nitrogen supersaturated micro-texture embedded in the AISI316 die. The printed surfaces were selectively sand-blasted to fabricate the micro-textured punch array for micro-embossing. A uniaxial compression testing machine was utilized to describe the micro-embossing behavior in copper substrates and to investigate how the micro-texture on the die was transcribed to the copper. The micro-punch array in this study consisted of three closed loop heads with a width of 75 μm and a height of 120 μm after plasma nitriding and sand-blasting. Since the nitrogen supersaturated heads had sufficient hardness against the blasting media, the printed parts of AISI316 die were removed. The micro-embossing process was described by comparison of the geometric configurations between the multi-punch array and the embossed copper plate.

Original languageEnglish (US)
Article number2640
JournalMaterials
Volume12
Issue number16
DOIs
StatePublished - Aug 1 2019

Keywords

  • AISI316
  • Copper substrate
  • Micro-embossing
  • Micro-punch array
  • Micro-textures
  • Packaging
  • Plasma printing
  • Screen printing

ASJC Scopus subject areas

  • Materials Science(all)

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