Lost Wax Casting

Lost Wax Casting Manufacturer in India

Sumangal Casting Pvt. Ltd. is a leading lost wax casting manufacturer in India. We are manufacture and supplier of lost wax casting products in the Netherlands, Poland, Russia, and many other parts of the world.

Our modern and well laid out manufacturing plant in Rajkot provides a whole range of lost wax castings that are made from ferrous metals and its alloys that include the cobalt and nickel super-alloy.

The lost wax casting process manufactures engineering components of the highest quality where one disposable pattern is used to produce only one metal part.

What process of casting did the lost wax casting manufacturer follow?

The early use of the process of lost wax casting can be traced back to the Indus valley civilization from then lost wax casting was used to make metal parts of any equipment and in the modern world, after industrialization, the same procedure is known as investment casting.

Investment casting is also known as lost-wax casting. This process is used by manufacturers to duplicate a metal part.

Metal sculpture is made from an original sculpture and intricate designs or work is needed to be obtained by using the lost wax casting method. There’s one direct method and the other one is the indirect method. And here’s a mention of both the methods of casting. While the indirect method starts from the model preparation, the direct method starts from the slurry step of this process.

  • Model preparation - First, an artist or mold-maker makes an original wax model in the casting process.

  • Mould preparation- Then mould preparation is done. First, an outer rigid mould is formed which contains the softer inner mould. This outer mould is the exact negative of the original wax model.

  • 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.

  • 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 smoothening it. After being polished the prepared casting now looks like the original model.

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