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What’s the process of investment casting?

Investment casting is also known as lost-wax casting. It’s a process used by investment casting manufacturers in which a duplicate metal sculpture is made from an original sculpture. Intricate designs and work can be achieved through investment casting.

Wax pouring and removal

After the mould making is done hot melted wax is poured in the cast to create an inner lining to form an even coating. The hollow wax copy is removed from the mould.

Chasing and spruing

The hollow wax copy is then chased. In this process, a hot metal tool is used to even out any marks left and the wax is dressed to hide any imperfections to prepare the final finished look. Now, the wax looks like a finished piece. After this, the wax copy is sprued with a tree-like structure that’s meant to provide a path for the air to escape and the molten material to flow.

Slurry

A sprued wax copy is dipped into the slurry of silica and then sand-like stucco. The shell is prepared and allowed to dry. This process is repeated to achieve the desired thickness of the shell coating. For bigger pieces, the shell coating needs to be thicker. The inside of the cup is not coated and kept hollow. The core is then layered with fireproof material.

Burnout

Now the shell-coated piece is placed cup-down in a kiln where the shell gets hardened due to the heat and the wax is melted and runs out. This melted wax can be recovered to be reused.

Model preparation

First, an artist or mould-maker makes an original wax model in the casting process.

Testing

The shell is now cooled and tested with free-flowing water through the vent tubes and feeder. If any cracks are discovered they’re patched with a thick paste.

Pouring

The shell is reheated to remove any traces of moisture from it and to harden the applied paste. After this, the process of pouring is conducted.  The shells are first placed in a tub of sand with their cups facing upward and then the molten metal which is melted in a furnace is poured into these shells. This process should be done carefully and the shells should be hot while the metal is poured into them or they will break if they are cold at the time of pouring.

Release

Later the shell is either blasted away and the rough-casting is released. The spurs formed on the metal are cut off and these metal pieces that are cut off will be used in another casting process.

Metal chasing

Now the metal cast is chased to remove all the signs of casting from the surface by smoothing it. After being polished the prepared casting now looks like the original model.

Investment Casting Manufacturer & Supplier in India

Sumangal Casting Pvt. Ltd. is the leading Investment casting manufacturer and supplier. We have a modern and well laid out manufacturing plant in Rajkot. We provide a whole range of investment castings made from ferrous metals and its alloys that include the cobalt and nickel super-alloy. 

Our advanced casting process has an installed capacity of 600 MT per annum and it manufactures engineering components of the highest quality where one disposable pattern produces only one metal part.
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Location: India

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