3D cutting machine of EPS foam for manufacturing free-formed concrete mold

Junghwan Seo, Daehie Hong

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We used a construction method using a CNC milling machine, where free-formed molds were made by cutting EPS (Expanded PolyStyrene) foam with the CNC machine, to build free-formed buildings. CNC milling is off-the-shelf technology that can easily cut EPS foam; however its production cost is too high and the time to manufacture an EPS mold is too long. This paper proposes a novel cutting machine with a fast and cost effective mechanism to manufacture EPS concrete molds. Our machine comprises a cutter and Cartesian coordinate type moving mechanism, where the cutter cuts EPS foam using a hotwire in the shape of '?' and is capable of adjusting its cutting angle in real-time while keeping its cutting width. We proved through cutting experiments on the CNC machine that cutting time was greatly shortened compared to the conventional method and that the resulting concrete mold satisfied manufacturing precision.

Original languageEnglish
Pages (from-to)35-39
Number of pages5
JournalJournal of the Korean Society for Precision Engineering
Issue number1
Publication statusPublished - 2017 Jan 1


  • CNC milling machine (CNC)
  • Cutting machine
  • EPS concrete mold (EPS)
  • Free-Formed building
  • Hotwire.

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Mechanical Engineering
  • Safety, Risk, Reliability and Quality


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