Optimization of Injection Molding Parameters for WC-Co Feedstocks
Keywords:Taguchi method, optimization, injection molding, green density
This study investigates the effect of injection molding parameters on the density of green body of cemented carbide (WC-Co) â€“ based powder injection molding (PIM) feedstock. Experiments were conducted with ball-milled WC-Co powder mixed with a palm stearin and polyethylene binder system. To minimize the test run while maintaining the quality standard of data measurement, design of experiment approach, particularly Taguchi Method with L18 orthogonal array was used in the present study. Several parameters were considered, namely, powder loading, injection temperature, holding pressure and injection rate, while density of the green body as the response factor. The results show the optimum combination of injection factor that produces the best green density value, which eventually will leads to higher density for sintered parts.
Xuanhui, Q., Jianxiang, G., Mingli, Q., Changming, L., 2005. Application of a Wax-based Binder in PIM of WC-TiC-Co Cemented Carbides. International Journal of Refractory Metals & Hard Materials. 23: 273â€“277.
Berginc, B., Kampus, Z., Sustarsic. 2007. Influence of Feedstock Characteristics and Process Parameters on Properties of MIM Parts Made of 316L. Powder Metallurgy. 50(2): 172â€“183.
Jamaludin, K. R., Muhamad, N., Rahman, M. N. A., Amin., S. Y. M., Murtadhahadi. 2008. Proceedings of International Conference of Mechanical and Manufacturing Engineering. Johor, Malaysia.
Nor, N. H. M., Muhamad, N., Ahmad., S., Ibrahim, M.H.I., Harun, M.R & Jamaludin, K.R. 2010. Parameter Optimization of Injection Molding Ti-6Al-4V Powder and Palm Stearin Binder System for Highest Green Density using Taguchi Method. Key Engineering Materials. 443: 69â€“74.
Amin., S. Y. M., Muhamad, N., Jamaludin, K.R., Fayyaz, A. & Heng, S.Y., 2012. Ball Milling of WC-Co as Injection Molding Feedstock. Applied Mechanics and Materials. 110â€“116: 1425â€“1430.
Phadke, M. S. 2008. Quality Engineering Using Robust Design. AT & T Bell Laboratories. Pearson Education.
Taguchi., G., Chowdhury, S. & Taguchi, S. 2000. Robust Engineering. McGraw-Hill.
Nutthita, C., Messer, P.F. & Davies, H.A. 2008. Application of Polyethylene Glycol and Polymethyl Methacrylate as a Binder for Powder Injection Moulding of Hardmetals. Chiang Mai Journal Science. 35(1): 188â€“195.
Jamaludin, K.R., Muhamad, N., Amin, S.Y.M., Rahman, M.N.A., Ismail, M.H., Murtadhahadi. 2008. Injection Moulding Parameter Optimization Using Taguchi Method for Highest Green Strength for Bimodal Powder Mixture with SS 316L in PEG and PMMA. Proceeding for World Powder Metallurgy & Partivulate Material Congress, Washington DC, USA.
How to Cite
Copyright of articles that appear in Jurnal Teknologi belongs exclusively to Penerbit Universiti Teknologi Malaysia (Penerbit UTM Press). This copyright covers the rights to reproduce the article, including reprints, electronic reproductions, or any other reproductions of similar nature.