Study of Casting Defects by Varying Molding Sand Properties &Temperature
Journal Title: International Journal of Engineering and Science Invention - Year 2017, Vol 6, Issue 11
Abstract
In this paper casting defects was studies due sand properties like permeability, grain size, moisture content and molten metal pouring temperature. Pure Aluminium metal has taken to study defects like porosity, shrinkage, and blow holes.In order to minimize these defects, process parameters were studied like Sand – Grain Fineness Number of sand, permeability, Pouring Temperature.Sieve shaker, Permeability meter, Muller machine, Scanning Electron Microscope was used to study the surface defects. Since permeability of sand is function of the degree of ramming, so it is very important to prepare the specimen according to standard conditions. A laboratory sand rammer was used along with a specimen tube to get standard ramming conditions. For this purpose three samples of aluminium product was casted from sand of different grain size. It has seen that casting defects like Blow holes was more when with Grain Fineness Number(GFN) was high &Permeability Number was low. If pouring temperature is much more than melting temperature of Aluminiumit creates more porosity but if pouring temperature is too nearby melting temperature then another defect like cold shut will occurs. Permeability of molding sand depends on number of factors like shape & size of sand grains, moisture content, amount of binder present and packing.Analysis is done using visually and with help of Optical imaging by LEICA DMLM & Using SEM by JEOL (JSM-6390LV).
Authors and Affiliations
Sudhir Kishore, Prakash Kumar
Keywords
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