Collapsibility Studies of MJM Acrylate Patterns for Investment Casting

Abstract:

Direct rapid investment casting (IC) is among the favorable and economical casting process due to its flexibility in fabricating any geometrical part features within a shorter lead time. Polymer based materials used in rapid prototyping (RP) technologies are exhibiting significant cost reduction for low volume production and are potentially replacing conventional wax materials as sacrificial patterns in IC process. This paper reports on the collapsibility characteristics of acrylate patterns during the burnout process for IC molds. The acrylate based patterns were fabricated by a Multijet Modelling (MJM) process with hollow internal structure. The MJM patterns were then Slurry procedure were introduced for producing toughest ceramic mould to prevent cracking occurrence. Results showed that the acrylate patterns start to decomposed gradually from the ceramic mold at 350°C and at 600°C, a total clean burnout without any residues and ash content was attained. This study shows that acrylate patterns built from RP technologies are suitable for fabricating ceramic molds and are highly potential in substituting conventional wax for IC process.

• Periodical: Applied Mechanics and Materials (Volume 330)
• Pages: 839-842
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.330.839
• Online since: June 2013
• Authors: O.M.F. Marwah., S. Sharif, M. Ibrahim, M.H. Idris
• Keywords: Investment Casting, Multijet Modeling, Rapid Casting, Rapid Prototyping (RP)

References

[1] Gouldsen, C. and Blake, P.:Investment casting using FDM ABS rapid prototype patterns, www.stratasys.com (1998).

[2] Norouzi, Y. and S. Rahmati: A novel lattice structure for SL investment casting patterns. Rapid Prototyping Journal, Vol.15 ,255-263, (2009).

DOI: 10.1108/13552540910979776

[3] Yao, W. L. and M. C. Leu, Analysis of shell cracking in investment casting with laser stereolithography patterns, Rapid Prototyping Journal 5(Compendex), pp.12-20, (1999).

DOI: 10.1108/13552549910251837

[4] Omar M.F.M., S.Sharif, M. Ibrahim, H.Hehsan.,M.N.M. Busari and Hafsa M.N. Evaluation of Direct Rapid Prototyping Pattern For Investment Casting, Advanced Materials Research Vols. 463-464, pp.226-233 (2012).

DOI: 10.4028/www.scientific.net/amr.463-464.226

[5] Harun, W. S. W., S. Sharif and H. Idris: Characteristic studies of collapsibility of ABS patterns produced from FDM for investment casting, Suite 1C, Joseph's Well, Hanover Walk, Leeds, LS3 1AB, United Kingdom , Maney Publishing, (2009).

DOI: 10.1179/143307509x441513

[6] Lee, C. W., C. K. Chua: Rapid investment casting Direct and indirect approaches via fused deposition modelling, International Journal of Advanced Manufacturing Technology , p.23, 93-101,(2004).

DOI: 10.1007/s00170-003-1694-y

[7] Norouzi, Y., S. Rahmati: A novel lattice structure for SL investment casting patterns, Rapid Prototyping Journal 15 , pp.255-263.(2009).

DOI: 10.1108/13552540910979776

[8] Marwah O.M.F., Sharif S. and Ibrahim M.:Direct Fabrication of IC Sacrificial Patterns via Rapid Prototyping Approaches, International Journal of Automation Technology 6 (5), pp.570-575, (2012).

DOI: 10.20965/ijat.2012.p0570