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Experimental and Analytical Investigation of the Effect of Additives on Green Sand Mold Properties Using Taguchi Method

Mst. Nazma Sultana, Md. Rafiquzzaman and Md. Al Amin

Department of Industrial Engineering and Management, Faculty of Mechanical Engineering, Khulna University of Engineering & Technology, Khulna 9203, Bangladesh


Abstract: In casting industry, quality of sand mold is one of the most important influential factors for achieving high quality cast products. In this study, an experimental and analytical investigation has been made to evaluate the influence of additives on green sand mold properties. Taguchi’s experimental design approach is adopted to achieve more robust results through reducing the number of experiments for changing parameters, and Analysis of Variance (ANOVA) technique is used to identify the significant factors and their percentage contribution for improved mechanical properties. The green sand properties considered are, moisture content, green compression strength (GCS), and permeability and the additives considered are water, bentonite and coal dust. Specimens with different percentages of additives were prepared based on standard procedures and subjected to basic molding sand testing including moisture content, permeability and green compression strength using standard methods and equipment. Experimental and analytical analysis results showed that water is the most influential factor for changing moisture content and bentonite is another most influential factor for affecting green compression strength and permeability. Coal dust has minor effect of changing sand mold properties rapidly. Normality, independence and constant variance assumptions are tested for concluding the decision that ANOVA analysis is realistic for this analysis.

Key words: Green sand, additives, permeability, green compression strength, moisture content, Taguchi method.
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