Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Study on the Effect of Thermal Property of Metals in Ultrasonic-Assisted Laser Machining

초음파 원용 레이저 가공에서 재료의 열적 물성이 표면상태에 미치는 영향에 관한 연구

  • Lee, Hu Seung (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Gun Woo (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Park, Jong Eun (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Yang, Min Yang (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Cho, Sung Hak (Div. of Nano-Convergence Manufacturing Systems Research, Korea Institute of Machinery and Materials) ;
  • Park, Jong Kweon (Dev. of Ultra-Precision Machines and Systems Advanced Manufacturing System Research, Korea Institute of Machinery and Materials)
  • 이후승 (한국과학기술원 기계공학과) ;
  • 김건우 (한국과학기술원 기계공학과) ;
  • 박종은 (한국과학기술원 기계공학과) ;
  • 양민양 (한국과학기술원 기계공학과) ;
  • 조성학 (한국기계연구원 나노공정연구실) ;
  • 박종권 (한국기계연구원 초정밀시스템연구실)
  • Received : 2014.11.06
  • Accepted : 2015.06.10
  • Published : 2015.08.01
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Abstract

The laser machining process has been proposed as an advanced process for the selective fabrication of electrodes without a mask. In this study, we adapt laser machining to metals that have different thermal properties. Based on the results, the metals exhibit a different surface morphology, heat-affected zone (HAZ), and a recast layer around the machined surface according to their thermal conductivity, boiling point, and thermal diffusivity. Then, we apply ultrasonic-assisted laser machining to remove the recast layer. The ultrasonic-assisted laser machining exhibits a better surface quality in metals with higher diffusivity than those having lower diffusivity.

레이저 가공 공정은 마스크 없이 전극을 가공할 수 있다는 장점 때문에 우수한 공정들 중의 하나로 제안되고 있다. 본 논문에서는, 서로 다른 열적 물성을 가지는 금속들에 레이저 가공을 수행하였다. 이 금속들은 서로 다른 표면형상, 열영향부, 그리고 재융착층을 나타내었고 이는 열전도도, 끓는점, 그리고 열확산계수에 의존하였다. 또한 재융착층을 제거하기 위하여 초음파 원용 레이저 가공을 적용, 높은 열확산계수를 가지는 재료에서 그 초음파 가진에 의한 표면 품질의 향상을 발견하였다.

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References

  1. Pyatenko, A., Wang, H., Koshizaki, N. and Tsuji, T., 2013, "Mechanism of Pulse Laser Interaction with Colloidal Nanoparticles," Laser Photonics Rev., Vol. 7, No. 4, pp. 596-604. https://doi.org/10.1002/lpor.201300013
  2. Chang, J. J., Warner, B. E., Dragon, E. P. and Martinez, M. W., 1998, "Precision Micromachining with Pulsed Green Lasers," J. Laser. Appl., Vol.10, No.6, pp. 285-291. https://doi.org/10.2351/1.521863
  3. Knowles, M. R. H., Rutterford, G., Karnakis, D. and Ferguson, A., 2007, "Micro-machining of Metals, Ceramics and Polymers Using Nanosecond Llasers," Int. J. Adv. Manuf. Technol., Vol.33, No.1, pp. 95-102. https://doi.org/10.1007/s00170-007-0967-2
  4. Kang, B., Kim, G. W., Yang, M., Cho, S.-H. and Park, J.-K., 2012, "A Sstudy on the Eeffect of Uultrasonic Vibration in Nnanosecond Laser Machining," Optics and Lasers in Engineering, Vol.50, No.12, pp. 1817-1822. https://doi.org/10.1016/j.optlaseng.2012.06.013
  5. Tolunay, M. N., Dawson, P. R. and Wang, K. K., 1983, "Heating and Bonding Mechanisms in Ultrasonic Welding of Thermoplastics," Polymer Engineering & Science, Vol. 23, No. 13, pp.726-733. https://doi.org/10.1002/pen.760231307