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For making die it is very important to get perfect drawings of the specimen to get perfect die cavity as per norms
After we get a correct die with perfect dimensions wax is injected in the die making is the replica of the final piece which is going to be casted.
Wax patterns dimensions are properly checked using Vernier caliper and are mounted on runner systems using sticky wax and finally it looks like wax pattern tree.
After the wax pattern are completely stick on the runners they are properly inspected and then are dipped in refractory ceramic material and coated with zircon sand kept for drying and after a cycle of dipping coating and drying a thick layer is formed on the wax patterns which is called ceramic shell.
After the shell is fully dried they are placed on shell stand and inserted in autoclave dewaxing machine and the wax is taken out from the shell at about 175°C which leaves the same cavity as the wax pattern inside the shell.
When the wax is removed from the shell. shell firing is done to remove the remains of the wax and increase the permeability of the shell.
As the shell achieves a certain temperature in shell firing furnace the shell is taken out and placed on a sand bed and then the metal is poured in the cavity of the shell.
As the metal is cooled down after pouring in shell the shell is set to knocking machine to remove the refractory ceramic and get the final casted parts.
The final castings are separated from the runner bars and further taken in machining department where finishing work like fettling, finishing is done of the casted parts. If needed certain heat treatments and surface treatments are given.
Foundry-men and artists to make intricate sculptures, ornaments and automobiles widely uses the lost-wax casting process from decades. This process is also used for making casting brooches, jewelry, buckles and other small parts used in various industries.
Despite modern ways of casting, foundry-men and artists still prefer the traditional methods of casting. Some of the advantages include
Hence, the lost wax investment casting process is a seasoned method for the reproduction of various objects.
However, the procedure does have its disadvantages such as the initial cost, need for large machinery and the particularity of holes in the mould. Therefore, it is important to look for expertise, design, performance and cost to get the best quality at the best price.
