Abstract
In the present era, polystyrene foam is widely used in foundries for pattern making. Industries extensively use the steam molding routes for polystyrene foam pattern making. However, the molding method cannot produce complex geometries. Industries are using the machining route for pattern making to overcome these limitations. There is limited research carried out on expanded polystyrene foam machining. Patterns need smooth surfaces with minimum surface roughness to make good quality castings. Therefore, there is a need to predict the surface roughness and its affecting parameters for polystyrene foam machining. The present article discusses a new theory for foam machining. The preliminary experiments identified two cutting mechanisms, mechanism I (through bead cutting) and mechanism II (bead removal). A novel mathematical model for the surface roughness has been developed and experimentally validated. A close correlation between the predicted and experimental values of average surface roughness (Ra) is observed with an average error of 19.70%. The correlation analysis shows a 93.07% correlation between the predicted and experimental values. The proposed mathematical model has been segregated into two parts because of through bead cutting and bead removal. Observation shows, the model part due to bead removal contributes significantly more (approximately 90% for all experiments) to the surface roughness. Therefore, surface roughness can be improved by minimizing or avoiding bead removal.
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Abbreviations
- R a :
-
Average surface roughness
- A d :
-
Bead dislocation/removal area
- A b :
-
Distorted bead area
- d :
-
EPS foam bead diameter(mm)
- a :
-
Cord diameter of foam bead in cutting plane
- x :
-
Position of mean line with respect to the cutting line
- Ө :
-
Deflection of the foam bead before cutting
- f :
-
Effective feed(mm/teeth)
- F :
-
Linear feed(mm/min)
- N :
-
Spindle speed(rpm)
- Z :
-
Number of teeth
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Acknowledgements
The authors would like to acknowledge the support from the MHRD UAY 005 project. The authors would also like to thank the late Mr. Sunil Mohite, proprietor of JMT, Mumbai, for his guidance and Mr. Prashant Chaurasia, a research scholar at IIT Bombay, for his help.
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Funding is provided by MHRD under UAY-005.
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Gopal Gote: conceptualization, validation, and writing original draft, Pushkar Kamble: validation, Rajendra Hodgir: validation, Yash Mittal: conceptualization, validation, K. P. Karunakaran: conceptualization and ideation.
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Gote, G., Kamble, P., Hodgir, R. et al. Mathematical modeling of surface roughness in polystyrene foam machining. Int J Adv Manuf Technol 120, 7461–7475 (2022). https://doi.org/10.1007/s00170-022-09229-6
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DOI: https://doi.org/10.1007/s00170-022-09229-6