Tool path generation for the five-axis CNC multi-stage incremental forming

  • Hu Zhu
  • Jialiang Li


Because the intermediate-stage forming surface and the intermediate-stage forming tool path of the complex shape model are difficult to generate, the existing multi-stage CNC incremental forming takes the regular rotary body model or the square model as the research objects, and all adopt the three-axis CNC incremental forming mode. In this paper, a method for generating the intermediate-stage surface by using a longitude line that can reflect the personality of the surface and the five-axis CNC multi-stage incremental forming tool path was proposed. Firstly, the vertexes of the triangular facets of the STL model are used to generate the longitude lines which can reflect the characteristic of the surface, then the longitude lines are offset according to the multi-stage forming strategy and the characteristics of each surface associated with the longitude lines so that the intermediate-stage longitude lines could be generated, and then the intermediate-stage surfaces are built using the intermediate-stage longitude lines. Finally, the cutter location points of each intermediate stage are obtained by cutting the intermediate-stage surfaces, and the postures of the five-axis CNC pressing tool are determined according to the normal vector of the cutter location points. The case studies show that the proposed method can well generate the five-axis CNC multi-stage incremental forming path for the complex shape sheet metal part. The results of the numerical simulation analysis and forming experiments show that the proposed method is applicable.


Sheet metal forming CNC incremental forming Multi-stage incremental forming Five-axis CNC incremental forming Tool path 


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The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (no. 51175351).


  1. 1.
    Tisza M (2012) General overview of sheet incremental forming. Mater Des 55(1):113–120Google Scholar
  2. 2.
    Leacock AG (2012) The future of sheet metal forming research. Mater Manuf Process 27(4):366–369. CrossRefGoogle Scholar
  3. 3.
    Ham M, Jeswiet J (2007) Forming limit curves in single point incremental forming. Ann CIRP 56(1):277–280. CrossRefGoogle Scholar
  4. 4.
    Cao T, Lu B, Xu D, Zhang H, Chen J, Long H, Cao J (2014) An efficient method for thickness prediction in multi-pass incremental sheet forming. Int J Adv Manuf Technol 77(1–4):469–483Google Scholar
  5. 5.
    Skjoedt M, Bay N, Endelt B, Ingarao G (2008) Multi-stage strategies for single point incremental forming of a cup. Int J of Mater Form 1(1):1199–1202. CrossRefGoogle Scholar
  6. 6.
    Malhotra R, Bhattacharya A, Kumar A, Reddy NV, Cao J (2011) A new methodology for multi-pass single point incremental forming with mixed toolpaths. Ann CIRP 60(1):323–326. CrossRefGoogle Scholar
  7. 7.
    Li J, Yang F, Zhou Z (2015) Thickness distribution of multi-stage incremental forming with different forming stages and angle intervals. J Centr South Univ 22(3):842–848CrossRefGoogle Scholar
  8. 8.
    Kim TJ, Yang DY (2000) Improvement of formability for the incremental sheet metal forming process. Int J Mech Sci 42(7):1271–1286. CrossRefzbMATHGoogle Scholar
  9. 9.
    Xu D, Malhotra R, Reddy NV, Chen J, Cao J (2012) Analytical prediction of stepped feature generation in multi-pass single point incremental forming. J Manuf Process 14(4):487–494. CrossRefGoogle Scholar
  10. 10.
    Liu Z, Daniel WJT, Li Y, Liu S, Meehan PA (2014) Multi-pass deformation design for incremental sheet forming: analytical modeling, finite element analysis and experimental validation. J Mater Process Technol 214(3):620–634. CrossRefGoogle Scholar
  11. 11.
    Liu Z, Li Y, Meehan PA (2014) Tool path strategies and deformation analysis in multi-pass incremental sheet forming process. Int J Adv Manuf Technol 75(1):395–409. CrossRefGoogle Scholar
  12. 12.
    Skjoedt M, Silva MB, Martins PAF, Bay N (2010) Strategies and limits in multi-stage single-point incremental forming. J Strain Anal 45(1):33–44. CrossRefGoogle Scholar
  13. 13.
    Li J, Geng P, Shen J (2013) Numerical simulation and experimental investigation of multistage incremental sheet forming. Int J Adv Manuf Technol 68(9):2637–2644CrossRefGoogle Scholar
  14. 14.
    Mo J, Han F (2008) State of the arts and latest research on incremental sheet NC forming technology. Chin Mech Eng 19(4):491–497Google Scholar
  15. 15.
    Hu Z, Nan L (2013) A new STL model based approach for tool path generation in CNC incremental forming. Int J Adv Manuf Technol 69(1–4):277–290Google Scholar
  16. 16.
    Taubin G (1995) Estimating the tensor of curvature of a surface from a polyhedral approximation. Proceedings of the Fifth International Conference on Computer Vision, Los Alamitos: 902–907Google Scholar
  17. 17.
    Shi F (2001) Computer aided geometric design & NURBS. Higher Education Press, BeijingGoogle Scholar
  18. 18.
    Sun Y, Xu J, Fei R, Guo Q (2014) High-performance multi axis precision machining technology and method of complex curved surface. Science Press, BeijingGoogle Scholar
  19. 19.
    Makhanov SS, Anotaipaiboon W (2013) Advanced numerical methods to optimize cutting operations of five axis milling machines. Machinery Industry Press, BeijingGoogle Scholar
  20. 20.
    Zhu H, Li N, Liu ZJ (2012) The effect of pressing direction on the five-axis CNC incremental forming quality. Int J Mater Form 5(3):227–233. CrossRefGoogle Scholar

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© Springer-Verlag London Ltd., part of Springer Nature 2017

Authors and Affiliations

  1. 1.College of Mechanical and Electrical EngineeringShenyang Aerospace UniversityShenyangChina

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