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

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Integrated NURBS Surface Interpolator Considering Both Rough and Finish Cuts

황삭 및 정삭을 고려한 통합형 NURBS 곡면 인터폴레이터

  • 구태훈 (단국대학교 대학원 기계공학과) ;
  • 지성철 (단국대학교 기계공학과)
  • Published : 2003.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

Three-axis CNC surface machining entails a series of processes including rough cutting, intermediate cutting and finish cutting for a reference surface defined in CAD/CAM. This study is targeting development of an integrated NURBS surface interpolator that can incorporate rough, intermediate and finish cutting processes. In each process, volume to be removed and cutting condition are different according to the shape of a part to be machined and the reference surface. Accordingly, the proposed NURBS surface interpolator controls motion in real-time optimized for the machining conditions of each process. In this paper, a newly defined set of G-codes is proposed such that NURBS surface machining through CNC is feasible with minimal information on the surface composition. To verify the usefulness of the proposed interpolator, through computer simulations on NURBS surface machining, total machining time, size of required NC data and cutting force variations are compared with the existing method.

Keywords

References

  1. Vickers, G. W. and Bradley, C., 1992, 'Curved Surface Machining through Circular Arc Interpolation,' Computers in Industry, Vol. 19, pp. 329-337 https://doi.org/10.1016/0166-3615(92)90070-4
  2. Piegl, L. and Tiller, W., 1995, The NURBS Book, 2nd Edition, Springer
  3. Lee, S. G. and Yang, S. H., 2001, 'CNC Tool Path Planning for Free-Form Sculptured Surface with a New Tool Path Internal Algorithm,' Journal of the KSPE, Vol. 18, No. 6, pp. 43-49
  4. Seong, W., Choi, C. H., and Song, O., 1999, 'A Toolpath Generation for CNC Machining of Free-form Surfaces,' Journal of the KSPE, Vol. 16, No. 4, pp. 129-137
  5. Suresh, K. and Yang, D. C. H., 1994, 'Constant Scallop-height Machining of Free-form Surfaces,' ASME Journal of Engineering for Industry, Vol. 116, pp. 253-259 https://doi.org/10.1115/1.2901938
  6. Lo, C. C., 2000, 'CNC Machine Tool Surface Interpolator for Ball-End Milling of Free-Form Surfaces,' International Journal of Machine Tools and Manufacture, Vol. 40, pp. 307-326 https://doi.org/10.1016/S0890-6955(99)00071-1
  7. Park, H. D. and Yang, M. Y., 1989, 'A Study on the Prediction of Cutting Force in Ball-End Milling Process,' Transactions of the KSME, Vol. 13, No. 3, pp. 433-442
  8. Smith, S. and Tlusty, J., 1991, 'An Overview of Modeling and Simulation of the Milling Process,' ASME Journal of Engineering for Industry, Vol. 113, pp. 169-175 https://doi.org/10.1115/1.2899674
  9. Kloypayan, J. and Lee, Y. S., 2002, 'Material Engagement Analysis of Different Endmills for Adaptive Feedrate Control in Milling Processes,' Computers in Industry, Vol. 47, pp. 55-76 https://doi.org/10.1016/S0166-3615(01)00136-1
  10. Jee, S. and Koo, T., 2002, 'NURBS Surface Interpolator for Constant Cutting Forces in Ball-End Milling,' Transactions of the KSME, A, Vol. 26, No. 9, pp. 1888-1896 https://doi.org/10.3795/KSME-A.2002.26.9.1888
  11. Farouki, R. T., Manjunathaiah, J., Nicholas, D., Yuan, G.-F. and Jee, S., 1998, 'Variable-Feedrate CNC Interpolators for Constant Material Removal Rates Along Pythagorean-hodograph Curves,' Computer-Aided Design, Vol. 30, pp. 631-640 https://doi.org/10.1016/S0010-4485(98)00020-7
  12. Lin, R. S. and Koren, Y., 1996, 'Efficient Tool-Path Planning for Machining Free-Form Surfaces,' ASME Journal of Engineering for Industry, Vol. 118, pp. 20-28 https://doi.org/10.1115/1.2803642
  13. Lo, C. C. and Lin, R. S., 2001, 'An Improved Method for Scheduling the Tool Paths for Three-axis Surface Machining,' International Journal of Machine Tools and Manufacture, Vol. 41, pp. 133-147 https://doi.org/10.1016/S0890-6955(00)00050-X