Korean Journal of Computational Design and Engineering (한국CDE학회논문집)

Society for Computational Design and Engineering (한국CDE학회)
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CNC Torch Path Generation for Laser Cutting of Planar Shapes

2차원 자유형상의 레이저 절단을 위한 CNC 공구경로 생성

  • Published : 2007.06.30
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Abstract

In this paper, we propose a knowledge-based method for generating CNC torch path for laser cutting of the outlines of planar shapes. The proposed method consists of two main phases: laser cutting knowledge construction and CNC torch path generation using the knowledge. In the first phase, cutting experiments are conducted on various operating parameters, and then empirical data are stored and analyzed to make up the knowledge of laser cutting. With this knowledge, we can inquire what a kerf width is for specific operating parameters. In the second phase, using the knowledge of laser cutting, CNC torch path is generated for cutting the outlines of the given planar shapes. This phase is basically based on the offset generation of each outline by a sequence of arc splines, where the offset distance is the same as the half of the kerf width determined from the constructed knowledge. The proposed method based on laser cutting knowledge makes full use of arc interpolators in CNC torch path generation. The method can efficiently reduce the number of path segments while keeping the torch path within the desired accuracy.

Keywords

References

  1. EI Wakil, S. D., 'Processes and Design for Manufacturing', PWS Publishing Company, Boston, 1998
  2. Ready, J. F., 'Industrial Applications of Lasers', Academy Press, Tokyo, 1997
  3. Wilson, J. and Hawkes, J. F. B., 'Lasers Principles and Applications', Prentice Hall, 1987
  4. Geiger, M., Manufacturing Science-driving Force for Innovation, Proceedings of the 7th ICTP Conference, 17-30, 2002
  5. Wollermann-Windgasse, R. and Schinzel, C., Laser Technology in Manufacturing - State of the Art at the Beginning of the 21st Century, Proceedings of LANE 2001 Conference, 87-102, 2001
  6. Yilbas, B. S., 'Experimental Investigation into $CO_{2}$ Laser Cutting Parameters', Journal of Material Processing Technology, Vol. 58, pp. 323-330, 1996 https://doi.org/10.1016/0924-0136(95)02094-2
  7. Aloke, R., Girish, V., Scrutton, R. F. and Molian, P. A., 'A Model for Prediction of Dimensional Tolerances of Laser Cut Holes in Mild Steel Thin Plates', International Journal of Machine Tools & Manufacture, Vol. 37, No.8, pp. 1069-1078, 1997 https://doi.org/10.1016/S0890-6955(96)00090-9
  8. Yilbas, B. S., 'Laser Cutting Quality Assessment and Thermal Efficiency Analysis', Journal of Material Processing Technology, 155-156, pp. 2106-2115, 2004
  9. Ahn, D. G., Kim, M. S., Lee, S. H., Park, H. and Yoo, Y. T., 'Influence of Process Parameters on the Kerfwidth for the Case of Laser Cutting of CPS IN Sheet Using High Power CW Nd:YAG Laser', Journal of the Korean Society of Precision Engineering, Vol. 22, No.7, pp. 19-26, 2005
  10. Trumpf Group, http://www.trumpf.com
  11. 최병규 외, 'CAD/CAM 시스템과 CNC 절삭가공', 회중당, 1999
  12. Neter, J., Wasserman, W. and Kunter, M. H., 'Applied Linear Statistical Models: Regression, Analysis of Variance, and Experimental Designs', IRWIN Inc., USA, 1990
  13. Lee, I. K., Kim, M. S. and Elber, G, 'Planar Curve Offset Based on Circle Approximation', ComputerAided Design, Vol. 28, No.8, pp. 617-630, 1996 https://doi.org/10.1016/0010-4485(95)00078-X
  14. Elber, G., Lee, I. K. and Kim, M. S., 'Comparing offset Curve Approximation Methods', IEEE Computer Graphics and Applications, Vol. 17, No.3, pp. 62-71, 1997
  15. Bolton, K. M., 'Biarc Curves', Computer-Aided Design, Vol. 7, No.2, pp. 89-92, 1975 https://doi.org/10.1016/0010-4485(75)90086-X
  16. Yeung, M. K. and Walton, D. J., 'Curve Fitting with Arc Splines for NC Toolpath Generation', Computer-Aided Design, Vol. 26, No. 11, pp. 845-849, 1994 https://doi.org/10.1016/0010-4485(94)90099-X
  17. Piegl, L. A. and Tiller, w., 'Biarc Approximation of NURBS Curves', Computer-Aided Design, Vol. 34, No. 11, pp. 807-814, 2002 https://doi.org/10.1016/S0010-4485(01)00160-9
  18. Park, H., 'Error-bounded Biarc Approximation of Planar Curves', Computer-Aided Design, Vol. 36, No. 12, pp. 1241-1251, 2004 https://doi.org/10.1016/j.cad.2004.01.001
  19. Park, H., 'Optimal Single Biarc Fitting and Its Applications', Computer-Aided Design and Applications, Vol. 1, No. 1-4, pp. 187-195, 2004
  20. POSCO, http://www.posco.com
  21. Lee, K., 'Principles of CAD/CAM/CAE Systems', Addison-Wesley, Tokyo, 1999