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Analysis of size effect on flow-induced defect in micro-scaled forming process

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Abstract

In microforming process, flow-induced defects caused by the irrational material flow in forming process have a significant effect on the quality of micro-formed part. In design of micropart and microforming process, this type of defects needs to be analyzed and the formation mechanism identified, such that the defects can be predicted and avoided via the rational design of micro-formed parts and microforming process. To address this issue, the size effect affected flow, and deformation behaviors need to be investigated. To explore how the size effects affect the flow-induced defects, experimental studies on the influence of a few significant parameters including geometry and grain sizes on the degree of flow-induced defects in microforming process of pure copper were conducted in this research. The flow-induced defects in microforming of a designed part are investigated, and the microstructure and flow pattern in micro-scaled extrusion of the parts with complicated shape are also studied. Based on the experimental results, the formation of folding defects is mainly affected by geometry size. The folding defect-free deformation occurs in the cases with coarse grains such that the parts with coarse grains do not have flow-induced defects, but some grains are broken and become potential insecurity factor. Furthermore, the relationship between grain and geometry sizes under which the flow-induced defects and grain broken can be successfully and simultaneously avoided is identified.

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References

  1. Geiger M, Kleiner M, Eckstein R, Tiesler N, Engel U (2001) Microforming. CIRP Annal-Manuf Technol 50:445–462

    Article  Google Scholar 

  2. Engel U, Eckstein R (2002) Microforming—from basic research to its realization. J Mater Process Technol 125:35–44

    Article  Google Scholar 

  3. Fu MW, Luo ZJ (1995) The simulation of the viscoplastic forming process by the finite-element method. J Mater Process Technol 55:442–447

    Article  Google Scholar 

  4. Fu MW, Shang BZ (1995) Stress analysis of the precision forging die for a bevel gear and its optimal design using the boundary-element method. J Mater Process Technol 53:511–520

    Article  Google Scholar 

  5. Vollertsen F, Biermann D, Hansen HN, Jawahir IS, Kuzman K (2009) Size effects in manufacturing of metallic components. CIRP Annal-Manuf Technol 58:566–587

    Article  Google Scholar 

  6. Chan WL, Fu MW, Lu J, Liu JG (2010) Modeling of grain size effect on micro deformation behavior in micro-forming of pure copper. Mater Sci Eng A 527:6638–6648

    Article  Google Scholar 

  7. Chan WL, Fu MW (2012) Studies of the interactive effect of specimen and grain sizes on the plastic deformation behavior in microforming. Int J Adv Manuf Technol

  8. Wang CJ, Shan DB, Zhou J, Guo B, Sun LN (2007) Size effects of the cavity dimension on the microforming ability during coining process. J Mater Process Technol 187:256–259

    Article  Google Scholar 

  9. Ike H (2003) Surface deformation vs. bulk plastic deformation—a key for microscopic control of surfaces in metal forming. J Mater Process Technol 138:250–255

    Article  Google Scholar 

  10. Diehl A, Engel U, Geiger M (2010) Influence of microstructure on the mechanical properties and the forming behaviour of very thin metal foils. Int J Adv Manuf Tech 47:53–61

    Article  Google Scholar 

  11. Chan WL, Fu MW (2011) Experimental studies and numerical modeling of the specimen and grain size effects on the flow stress of sheet metal in microforming. Mater Sci Eng A 528:7674–7683

    Article  Google Scholar 

  12. Messner A, Engel U, Kals R, Vollertsen F (1994) Size Effect in the Fe-simulation of micro-forming Pprocesses. J Mater Process Technol 45:371–376

    Article  Google Scholar 

  13. Shan DB, Wang CJ, Guo B, Wang XW (2009) Effect of thickness and grain size on material behavior in micro-bending. T Nonferr Metal Soc 19:S507–S510

    Article  Google Scholar 

  14. Siopis MS, Kinsey BL (2010) Experimental Investigation of grain and specimen size effects during electrical-assisted forming. J Manuf Sci E-T Asme: 132

  15. Geiger M, Messner A, Engel U (1997) Production of microparts—size effects in bulk metal forming, similarity theory. Prod Eng 4:55–58

    Google Scholar 

  16. Fu MW, Chan WL (2013) A review on the state-of-the-art microforming technologies. Int J Adv Manuf Tech 67:2411–2437

    Article  Google Scholar 

  17. Chan WL, Fu MW, Yang B (2012) Experimental studies of the size effect affected microscale plastic deformation in micro upsetting process. Mater Sci Eng A 534:374–383

    Article  Google Scholar 

  18. Chan WL, Fu MW, Lu J (2011) Experimental and simulation study of deformation behavior in micro-compound extrusion process. Mater Des 32:525–534

    Article  Google Scholar 

  19. Balendra R, Qin Y (2000) Identification and classification of flow-dependent defects in the injection forging of solid billets. J Mater Process Technol 106:199–203

    Article  Google Scholar 

  20. Arentoft M, Wanheim T (1997) The basis for a design support system to prevent defects in forging. J Mater Process Technol 69:227–232

    Article  Google Scholar 

  21. Lee DJ, Kim DJ, Kim BM (2003) New processes to prevent a flow defect in the combined forward–backward cold extrusion of a piston-pin. J Mater Process Technol 139:422–427

    Article  Google Scholar 

  22. Chan WL, Fu MW, Lu J (2010) FE Simulation-based folding defect prediction and avoidance in forging of axially symmetrical flanged components. J Manuf Sci E-T Asme: 132

  23. Wang JL, Fu MW, Ran JQ (2013) Analysis and avoidance of flow-induced defects in meso-forming process: simulation and experiment. Int J Adv Manuf Technol: 1-14

  24. Petrov P, Perfilov V, Stebunov S (2006) Prevention of lap formation in near net shape isothermal forging technology of part of irregular shape made of aluminium alloy A92618. J Mater Process Technol 177:218–223

    Article  Google Scholar 

  25. Fu MW, Luo ZJ (1992) The prediction of macro-defects during the isothermal forging process by the rigid viscoplastic finite-element method. J Mater Process Technol 32:599–608

    Article  Google Scholar 

  26. Rosochowski A, Presz W, Olejnik L, Richert M (2007) Micro-extrusion of ultra-fine grained aluminium. Int J Adv Manuf Technol 33:137–146

    Article  Google Scholar 

  27. Parasiz SA, Krishnan N, Li M, Cao J, Kinsey B (2006) Investigation of deformation size effects during microextrusion. J Manuf Sci Eng 129:690–697

    Article  Google Scholar 

  28. Chan WL, Fu MW, Yang B (2011) Study of size effect in micro-extrusion process of pure copper. Mater Des 32:3772–3782

    Article  Google Scholar 

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Authors and Affiliations

  1. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong

    J. L. Wang, M. W. Fu & J. Q. Ran

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  1. J. L. Wang
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  2. M. W. Fu
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  3. J. Q. Ran
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Correspondence to M. W. Fu.

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Wang, J.L., Fu, M.W. & Ran, J.Q. Analysis of size effect on flow-induced defect in micro-scaled forming process. Int J Adv Manuf Technol 73, 1475–1484 (2014). https://doi.org/10.1007/s00170-014-5947-8

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  • DOI: https://doi.org/10.1007/s00170-014-5947-8

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