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Precision Casting Process

Precision Casting Process

Step 1. MOLD DESING

As pee the drawing, our engineer will finish mold design. The mold is purchased from mold factory.

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Step 2. WAX INJECTION
The wax is be injected by machine. Wax design of the desired castings are produced by injection molding. These process is called patterns.

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Step 3 . ASSEMBLY TREE
The patterns are attached to a central wax stick, called a sprue, to form a casting cluster or assembly tree.

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Step 4. SHELL MAKING
The shell is built by immersing the assembly in a liquid ceramic slurry and then into a bed of extremely fine sand. Up to SIX layers may be applied in this manner. The shell will be dry in each layer making.

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Step 5. DEWAX
Once the ceramic is dry,then heating. The wax will be melted out. The melted wax will be flow out from the shell.

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Step 6. CASTING
In the conventional process, the shell is filled with molten metal by gravity pouring. As the metal cools, the parts and gates, sprue and pouring cup become solid casting.

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Step 7. KNOCKOUT
When the metal has cooled and solidified, the ceramic shell will be broken off by vibration or knock-out machine.

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Step 8. CUT OFF
The parts are cut away from the central spruce using a high speed friction saw.

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Step 9. GRINDING
After the casting was cut off.The casting pouring part will be grind ed carefully.

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Step 10.Inspection and Post Treatment.
The casting will be inspected by inspector as per drawing and quality request.If there is unqualified parts. It will be repaired and inspected again.

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Step 11. FINISHED CASTINGS
After surface finishing operations, the metal castings becomes identical to the original wax patterns and are ready for shipment to the customer.