• Title/Summary/Keyword: Ultrahigh-speed air turbine spindle

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Development of the Micro Tool Dynamometer for Micro Machining (미세가공을 위한 마이크로 공구동력계 개발)

  • Kwon D.H.;Hwang I.O.;Kang M.C.;Kim J.H.;Kim J.S.;Ahn J.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.217-218
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    • 2006
  • This paper presents an investigation on the characteristics for new micro tool dynamometer by using the ultrahigh-speed air turbine spindle. Recently, the ultrahigh-speed micro flat endmilling has been investigated actively due to request of accuracy improvement and productivity of die and mould manufacturing. To perform efficient ultrahigh-speed micro flat endmilling, evaluation of ultrahigh-speed machinability must be studied preferentially and it can be identified by investigation of cutting force. The cutting forces in ultrahigh-speed micro flat endmilling can be measured by micro tool dynamometer. But general dynamometer has low natural frequency and so is improper for measuring very high frequency cutting forces in ultrahigh-speed micro flat endmilling. In this study, the micro tool dynamometer which has very high natural frequency is newly designed.

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A Study on the Machining Characteristics for Micro Endmilling by using Ultrahigh-Speed Air Turbine Spindle (초고속 스핀들에 의한 마이크로 엔드밀링의 가공특성에 관한 연구)

  • Kwon D.H.;Kang I.S.;Kim J.H.;Kang M.C.;Kim J.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.598-603
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    • 2005
  • Recently, the advanced industries using micro parts are rapidly growing. The appearance of ultra-precision feed mechanism and the development of control system make it possible to process parts in sub millimeter scale by mechanical methods. Micro endmilling is one of the prominent technology that has wide spectrum of application field ranging from macro parts to micro products. So, micro stairs have been trying to cut by using high revolution air turbine spindle and micro-endmill, and studying for magnitude of cutting force. This investigation deals removal characteristics of burr generated by micro endmilling process. Also, decreasing of burr is significant problem in making smooth and precise parts in micro endmilling. In micro endmilling, the material removal rate(MRR) and cutting forces are very small. This paper presents an investigation on the machining characteristics for micro stairs by using ultrahigh-speed air turbine spindle in machining.

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The Characteristics of Damaged Layer According to Depth of Cut in Micro Endmilling (마이크로 엔드밀링에서 가공깊이에 따른 가공변질층의 특성)

  • Lee, Jong-Hwan;Kwon, Dong-Hee;Park, Jin-Hyo;Kim, Byung-Min;Jung, Yoong-Ho;Kang, Myung-Chang;Lee, Seong-Yong;Kim, Jeong-Suk
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.5
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    • pp.77-83
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    • 2007
  • The study on damaged layer is necessary for machinability improvement in micro machining. The damaged layer in metal cutting is derived from plastic deformation and transformation of metal structure. The damaged layer affects micro mold life and micro machine parts. In this study, the damaged layer of micro machined surface of copper is evaluated according to various machining condition. The damaged layer structure and metallurgical characteristics are measured by optical microscope, and evaluated by cutting forces and surface roughness. The scale of this damaged layer depends on cutting process parameters and machining environments. By experimental results, depth of damaged layer was increased with increasing of cutting depth, also the damaged layer is less occurred in down-milling compared to up-milling during micro endmilling operation.