Optimization of factors effecting Green Compression Strength and Shear Strength of Moulding sand using Box Banhken Technique

Abstract

In sand casting process, the mould strength plays a major role as it has to withstand the stresses developed by the molten metal. The strength of the moulding sand depends on various parameters like grain size, moisture content, clay content, type of binder etc. In the present work the effect of various process parameters like grain size, moisture content, clay content and binder content on green compression strength and shear strength of the molding sand are investigated by using Box Banhken Model of Response Surface Method. Four factor three levels are used and total 27 experiments are performed. The coefficients are calculated by using regression analysis and the model is constructed. The adequacy of the developed model is checked using Analysis of Variance (ANOVA) technique. By using the mathematical model the main and interaction effect of various process parameters on green compression strength and shear strength of moulding sand is studied. Contour plots are drawn to identify
the dominating parameters. Grey Relational Analysis (GRA) is performed to find the optimalcombination of moulding sand parameters.