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Effect of delay time on part strength in selective laser sintering

Abstract

Selective laser sintering (SLS) is one of the most popular layered manufacturing processes used for making functional prototypes of polymers and metals. It is a powder-based process in which layers of powder are spread and laser is used to sinter selected areas of preheated powder. In the present work, experimental investigations have been made to understand effect of delay time on SLS prototypes. Delay time is the time difference for laser exposure between any two adjacent points on successive scanning lines on a layer. Tensile specimens of polyamide material as per the ASTM standard are fabricated on SLS machine keeping delay time range constant for the entire specimen. Specimens are fabricated for different ranges of delay time and tested on universal testing machine for tensile strength. An optimum value of delay time range is obtained experimentally. As delay time depends on part build orientation, an algorithm has been developed and implemented to find out optimum part build orientation for improving tensile strength. The obtained results from developed code are validated experimentally for tensile specimen. Case study for a typical 3D part is also presented to demonstrate the capabilities of developed algorithm.

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References

  1. Pham DT, Dimov SS (2001) Rapid manufacturing: the technologies and applications of rapid prototyping and rapid tooling. Springer, London

    Google Scholar 

  2. Tang Y, Loh HT, Fuh JYH, Wong YS, Lee HS (2005) An algorithm for disintegrating large and complex rapid prototyping objects in a CAD environment. Int J Adv Manuf Technol 25:895–901 doi:10.1007/s00170-003-1913-6

    Article  Google Scholar 

  3. Chen YH, Ng CT, Wang YZ (1999) Generation of an STL File from 3D measurement data with user-controlled data reduction. Int J Adv Manuf Technol 15:127–131 doi:10.1007/s001700050049

    Article  Google Scholar 

  4. Wang RJ, Wang L, Zhao L, Liu Z (2007) Influence of process parameters on part shrinkage in SLS. Int J Adv Manuf Technol 33:498–504 doi:10.1007/s00170-006-0490-x

    Article  Google Scholar 

  5. Chua CK, Leong KF, Lim CS (2003) Rapid prototyping: principles and applications, 2nd edn. World Scientific, Singapore

    Google Scholar 

  6. Venuvinod PK, Ma W (2004) Rapid prototyping: laser based and other technologies. Kluwer, Boston

    Google Scholar 

  7. Pandey PM, Reddy NV, Dhande SG (2003) Slicing procedures in layered manufacturing: a review. Rapid Prototyping J 9(5):274–288 doi:10.1108/13552540310502185

    Article  Google Scholar 

  8. Kruth JP, Wang X, Laoui T, Froyen L (2003) Lasers and materials in selective laser sintering. Assembly Autom 23(4):357–371 doi:10.1108/01445150310698652

    Article  Google Scholar 

  9. Jain PK, Senthilkumaran K, Pandey PM, Rao PVM (2006) Advances in materials for powder based rapid prototyping. Proceedings of International Conference on Recent Advances in Materials and Processing. PSG College of Technology, Coimbatore, India, December 15–16

  10. Pham DT, Dimov SS, Lacan F (1999) Selective laser sintering: applications and technological capabilities. J Eng Manuf 213:435–449

    Article  Google Scholar 

  11. Wang XC, Laoui T, Bonse J, Kruth JP, Lauwers B, Froyen L (2002) Direct selective laser sintering of hard metal powders: experimental study and simulation. Int J Adv Manuf Technol 19:351–357 doi:10.1007/s001700200024

    Article  Google Scholar 

  12. Gibson I, Shi D (1997) Material properties and fabrication parameters in selective laser sintering process. Rapid Prototyping J 3(4):129–136 doi:10.1108/13552549710191836

    Article  Google Scholar 

  13. Thompson DC, Crawford RH (1997) Computational quality measures for evaluation of part orientation in free form fabrication. J Manuf Syst 16(4):273–289

    Article  Google Scholar 

  14. Williams JD, Deckard CR (1998) Advances in modelling the effects of selected parameters on the SLS process. Rapid Prototyping J 4(2):90–100 doi:10.1108/13552549810210257

    Article  Google Scholar 

  15. Yang J, Bin H, Zhang X, Liu Z (2003) Fractal scanning path generation and control system for selective laser sintering. Int J Mach Tool Des Res 43:293–300

    Article  Google Scholar 

  16. Ning Y, Wong YS, Fuh JYH (2005) Effect and control of hatch length on material properties in the direct metal laser sintering process. J Eng Manuf 219:15–25

    Article  Google Scholar 

  17. Caulfield B, McHugh PE, Lohfeld S (2007) Dependence of mechanical properties of polyamide components on build parameters in the SLS process. J Mater Process Technol 182:477–488 doi:10.1016/j.jmatprotec.2006.09.007

    Article  Google Scholar 

  18. Jain PK, Pandey PM, Rao PVM (2007) Experimental investigations into the effect of delay time on part strength in selective laser sintering. Proceedings of International Conference on Manufacturing Automation. National University of Singapore, Singapore, May 28–30, pp 501–516

  19. Raghunath N, Pandey PM (2006) Improving accuracy through shrinkage modelling by using Taguchi method in selective laser sintering. Int J Mach Tools Manuf 47:985–995 doi:10.1016/j.ijmachtools.2006.07.001

    Article  Google Scholar 

  20. Bacchewar PB, Singhal SK, Pandey PM (2007) Statistical modelling and optimization of surface roughness in selective laser sintering process. J Eng Manuf B 221:35–52

    Article  Google Scholar 

  21. Ajoku U, Saleh N, Hopkinson N, Hague R, Erasenthiran P (2006) Investigating mechanical anisotropy and end-of-vector effect in laser-sintered nylon parts. J Eng Manuf B 220:1077–1086

    Article  Google Scholar 

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Correspondence to Pulak M. Pandey.

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Jain, P.K., Pandey, P.M. & Rao, P.V.M. Effect of delay time on part strength in selective laser sintering. Int J Adv Manuf Technol 43, 117 (2009). https://doi.org/10.1007/s00170-008-1682-3

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  • DOI: https://doi.org/10.1007/s00170-008-1682-3

Keywords

  • Selective laser sintering
  • Scan length
  • Delay time
  • Part strength
  • Part build orientation