Learn more about the Investment Casting Process…..

The Investment Casting Process…

Also Known as The Lost Wax Casting Process….

Explained in 9 Steps

Wax Making Process

1. Wax Making

Wax replicas of the desired castings are produced by injection moulding using a metal die or 3D printing. These replicas are called “patterns”.

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2. Wax Assembly

These patterns are attached via a ‘gate’ to a central wax stick, referred to as a ‘tree’ or ‘sprue’, to form a casting cluster or assembly, and mounted on a pouring cup.

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3. Investing

 A shell is built by immersing the assembly in a liquid ceramic slurry and then into a bed of extremely fine sand. Several layers may be applied in this manner.

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4. Dewaxing

Once the ceramic is dry, the wax is melted out in an autoclave, creating a negative impression of the assembly within the shell. The shell mould is then fired in a high temperature oven.

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5. Casting

The shell is filled with molten metal – metal injection moulding in a variety of materials, using various techniques and, as the metal cools, the parts, gates, tree and pouring cup become a solid casting.

Knock out Lestercast

6. Knock out

When the metal has cooled and solidified, the ceramic shell is broken off by vibration or water blasting.

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7. Cut Off

The parts are cut away from the central tree using a high speed friction saw.

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8. Finishing

 Minor finishing operations, such as fettling and grinding, are undertaken to produce a metal casting identical to the original wax pattern.

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9. Inspection

The finished component will then be checked for surface defects, and imperfections using gauges, calipers or further analysis using CMM.

Want To See The Investment Casting Process In Action?

Watch our Video Now  ›

Step inside our laboratory to see the wax patterns being assembled, watch the waxes being dipped in the slurry, see the ceramic coated waxes drying in our dedicated drying rooms and take a sneaky peak at the foundry to watch the ceramics being fired and the molten metal poured…..