Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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An Ultra-precision Lathe for Large-area Micro-structured Roll Molds

대면적 미세패턴 롤 금형 가공용 초정밀 롤 선반 개발

  • Oh, Jeong Seok (Advanced Manufacturing Systems Research Division, Korea Institute of Machinery & Materials) ;
  • Song, Chang Kyu (Advanced Manufacturing Systems Research Division, Korea Institute of Machinery & Materials) ;
  • Hwang, Jooho (Advanced Manufacturing Systems Research Division, Korea Institute of Machinery & Materials) ;
  • Shim, Jong Youp (Advanced Manufacturing Systems Research Division, Korea Institute of Machinery & Materials) ;
  • Park, Chun Hong (Advanced Manufacturing Systems Research Division, Korea Institute of Machinery & Materials)
  • 오정석 (한국기계연구원 첨단생산장비연구본부) ;
  • 송창규 (한국기계연구원 첨단생산장비연구본부) ;
  • 황주호 (한국기계연구원 첨단생산장비연구본부) ;
  • 심종엽 (한국기계연구원 첨단생산장비연구본부) ;
  • 박천홍 (한국기계연구원 첨단생산장비연구본부)
  • Received : 2013.10.02
  • Accepted : 2013.11.08
  • Published : 2013.12.01
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Abstract

We report an ultra-precision lathe designed to machine micron-scale features on a large-area roll mold. The lathe can machine rolls up to 600 mm in diameter and 2,500 mm in length. All axes use hydrostatic oil bearings to exploit the high-precision, stiffness, and damping characteristics. The headstock spindle and rotary tooling table are driven by frameless direct drive motors, while coreless linear motors are used for the two linear axes. Finite element method modeling reveals that the effects of structural deformation on the machining accuracy are less than $1{\mu}m$. The results of thermal testing show that the maximum temperature rise at the spindle outer surface is approximately $0.5^{\circ}C$. Finally, performance evaluations of the error motion, micro-positioning capability, and fine-pitch machining demonstrate that the lathe is capable of producing optical-quality surfaces with micron-scale patterns with feature sizes as small as $20{\mu}m$ on a large-area roll mold.

Keywords

References

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