The process of casting the national emblem
A computer graphic sketch was made and based on that a clay model was created. Once approved by the competent authorities, the FPR Model was made. Then with the lost-wax process, the wax mold and bronze cast were done.
The process of lost wax casting
To cast the clay into the bronze, a mold is made from the model, and the inside of this negative mold is brushed with melted wax to the desired thickness of the final bronze. After the removal of the mold, the resultant wax shell is filled with a heat-resistant mixture.
Wax tubes, which provide ducts for pouring bronze during casting and vents for the gases produced in the process, are fitted to the outside of the wax shell. Metal pins are hammered through the shell into the core to secure it. Next, the prepared wax shell is completely covered in layers of heat-resistant fiber-reinforced plastic, and the whole is inverted and placed in an oven.
During heating, the plaster dries and the wax runs out through the ducts created by the wax tubes. The plaster mold is then packed in sand, and molten bronze is poured through the ducts, filling the space left by the wax. When cool, the outer plaster and core are removed, and the bronze may receive finishing touches.
Finally, the statue is polished and breezed and ready with a clear coat of protective polish and no paint to showcase the rich metal. (AA/IANS)
