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Abstract

‘Dhokra’ or ‘Dokra’ casting is a sophisticated cast metal craft tradition of the Indian subcontinent. It has been practiced by the countryfolk now since the Copper Age. It is a lost wax casting process in the hot clay mold. The technology is such sophisticated that it can produce up to 400 μm thin-walled hollow cast products with complicated and intricate shapes using Brass, Bronze, Copper, and other copper alloys. The investigation was for engraving Brass (2% lead) which is used by Dhokra artisans nowadays. In a field visit during dimensional analysis, one discrepancy was identified. The metal thicknesses of hollow castings are thicker than the thickness of the wax pattern. This cast metal dilation phenomenon is unusual. Shrinkage of metals compared to the pattern dimension is familiar in the casting world. The same abnormalities in the repeated investigation at different sites were observed. All the studies and experiments were organized to explain the reason hidden behind the phenomenon.
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Bibliography

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[2] Mukherjee, D. (2016). A comparative study of dokra metal craft technology and harappan metal craft technology. Heritage: Journal of Multidisciplinary Studies in Archaeology. 4, 757-768.
[3] Roy, S., Pramanick, A.K. & Datta, P.K. (2020). Precise filling time calculation of thin walled investment casting in hot mold. Journal of the Brazilian Society of Mechanical Sciences and Engineering. 42(10), 1-11. https://doi.org/10.1007/s40430-020-02634-6.
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Authors and Affiliations

S. Roy
1
ORCID: ORCID
A.K. Pramanick
1
P.K. Datta
1
ORCID: ORCID

  1. Dept. of Metallurgical and Material Engineering, Jadavpur University, Kolkata-700032, India
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Abstract

Dokra casting is famous for its Artistic value to the world but it is also sophisticated engineering. The technique is almost 4500 years old. It is practiced by the tribal artisans of India. It is a clay moulded wax-based thin-walled investment casting technique where liquid metal was poured into the red hot mould. Dimensional accuracy is always preferable for consumers of any product. Distortion is one of the barriers to achieving the accurate dimension for this type of casting especially for the bending parts. The cause and nature of the distortion for this type of casting must be analyzed to design a product with nominal tolerance and dimensional accuracy.
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Bibliography

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[21] Mandal, B. & Datta, P. K. (2010). Understanding alloy design principles and cast metal technology in hot molds for medieval Bengal. Indian Journal of History of Science, 101-140.
[22] Roy, S., Pramanick, A.K. & Datta, P.K. (2021). Quality analysis of tribal casting products by topsis for different gating system. IOP Conference Series: Materials Science and Engineering. 1080(1), 012014, 1-5. DOI: 10.1088/1757-899X/1080/1/012014.
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[29] Roy, S., Pramanick, A.K. & Datta, P.K. (2023). Negative shrinkage of thin-walled investment brass castings. Archives of Foundry Engineering. 23(1), 17-24. DOI: 10.24425/afe.2023.144275.
[30] Roy, S., Pramanick, A.K. & Datta, P.K. (2020). Precise filling time calculation of thin-walled investment casting in hot mold. Journal of the Brazilian Society of Mechanical Science and Engineering. 42(10), 552, 1-11. https://doi.org/10.1007/s40430-020-02634-6.

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Authors and Affiliations

R. Mandal
1
S. Roy
2
ORCID: ORCID
S. Sarkar
1
T. Mandal
3
A.K. Pramanick
2
G. Majumdar
1

  1. Mechanical Engineering Department, Jadavpur University, India
  2. Metallurgical and Material Engineering Department, Jadavpur University, India
  3. Metallurgy and Materials Engineering, IIEST Shibpur, India

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