Grain size effect on multi-stage micro deep drawing of micro cup with domed bottom

Wen Ting Li, Mingwang Fu, Ji Lai Wang, Bao Meng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)


A two-stage micro deep drawing system was designed and developed to manufacture a micro cup with domed bottom. The copper blank was annealed at three different conditions to obtain different grain sizes in such a way to study the grain size effect on the deformation behavior and thickness variation of the micro part. To investigate the instantaneous effect and deformation behavior, finite element simulation was used to simulate the whole drawing process. It revealed that the fracture in the place with the thinnest thickness in the micro part drawn from a circle blank with residual stress induced in blanking can be easily happen and the deformation load in the first-stage decreases more than that in the second-stage with the increase of grain size. Moreover, the micro part with a larger grain size has more nonuniform thickness and severer thinning around the punch corner. The surface roughness at the bottom of micro part increases with the grain size. The surface roughness at the wall of it, however, decreases with the deformation stage mainly due to the ironing effect. The research promotes the understanding of grain size effect on multi-stage micro deep drawing and facilitates the development of microforming process.
Original languageEnglish
Pages (from-to)765-773
Number of pages9
JournalInternational Journal of Precision Engineering and Manufacturing
Issue number6
Publication statusPublished - 1 Jun 2016


  • Deformation behavior
  • Deformation defect
  • Grain size effect
  • Multi-stage micro deep drawing
  • Thickness variation

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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