Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Analysis on Specific Cutting Resistance Variation by Tool Angles Based on a Concept of Representative Stres

겉보기 응력 개념에 기반한 공구각에 따른 비절삭저항 변화 분석

  • Jeon, Eun-Chae (Dept. of Nanomanufacturing Technology, Korea Institute of Machinery and Materials, KIMM) ;
  • Choi, Hwan-Jin (Dept. of Nanomanufacturing Technology, Korea Institute of Machinery and Materials, KIMM) ;
  • Lee, Kyu-Min (Dept. of Nanomanufacturing Technology, Korea Institute of Machinery and Materials, KIMM) ;
  • Lee, Yun-Hee (Div. of Industrial Metrology, Korea Institute of Standards and Science, KRISS) ;
  • Je, Tae-Jin (Dept. of Nanomanufacturing Technology, Korea Institute of Machinery and Materials, KIMM) ;
  • Kim, Jeong-Hwan (Dept. of Nanomanufacturing Technology, Korea Institute of Machinery and Materials, KIMM) ;
  • Choi, Doo-Sun (Dept. of Nanomanufacturing Technology, Korea Institute of Machinery and Materials, KIMM)
  • Received : 2014.01.03
  • Accepted : 2014.03.11
  • Published : 2014.04.30
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Abstract

In the past, prism patterns have been linear triangular shapeswith a $90^{\circ}$ angle; however, new micro prism patterns having acute angles or obtuse angles have recently been the subject of demandin the display, lighting and photovoltaic industries. Micro-cutting experiments for micro-prism patterns having $60^{\circ}$, $90^{\circ}$, and $120^{\circ}$ angles on an electroplated Ni mold were performed and it was found in this study that the specific cutting resistance increased with a decrease in the tool angles (prism pattern angles). The cause of this variation had been thought to be the increase of the ploughing force due to tip rounding and the friction force due to the edge effect. However, the depth of the cut was large enough that it was possible to neglect these effects. Therefore, this study introduced the concept of representative stress of indentation. The measured stress was varied according to the indentation depth eventhoughthetestedspecimenswereidentical ; the varied stress was termed the representative stress. According to indentation theory, the strain that the Ni mold experienced increased with a decrease in the tool angle. Based on the stress-strain relationship, higher strain means higher stress and higher specific cutting resistance. Therefore, the specific cutting resistance was higher at smaller tool angles that had higher strain and stress.

Keywords

References

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