Grain Fineness Number of Various River Sands for Metal Casting

Abstract

The Grain Fineness Number (GFN) is the quantitative indication of the grain size distribution of the sand Sample by carrying out sand sieve analysis. The current manuscript aims to determine the value of GFN of various river sands. I.e. to determine the suitability of sand with the physical requirements of sand moulding. Calculating the grain fineness number gives an estimate of the average grain size of the sand sample. The grain size distribution influences the properties of sand as follow refractoriness, green strength, dry strength, hot Strength, permeability, compatibility. Permeability is the gas evolution capability of the moulding sand. A sand contained a wide range of particle size will have low permeability as compared to that containing grains of average fineness. Sand that is too fine or too coarse can affect the quality of casting produced. Different sands have different GFN values and they are used for variety of castings. According to ASTM (American society for testing and materials) the standard values are in between 35 to 90 GFN and it is suitable for both medium and heavy meatal casting. If the grain fineness number is in between 35 to 90 then the sand is suitable for moulding. It is evident from the results that samples 1, 2 and 3 river sands selected from Nagavali, Godavari, Krishna rivers respectively are suitable for sand moulding whose values of GFN are between 35-90. On the other side sample4, beach sand is possessing GFN of less than 30, hence not suitable for moulding.

Cite as

B. Padmini, B. Likitha, B. Venkata Kamesh, B. Deepika, N Jagadeesh, & D Santhosh Kumar. (2021). Grain Fineness Number of Various River Sands for Metal Casting. Research and Reviews: Journal of Mechanics and Machines, 3(1), 1–5. http://doi.org/10.5281/zenodo.4817506