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The Investment Casting Process

 


  1. WAX INJECTION
Wax replicas of the desired castings are produced. These replicas are called patterns.


  2. SPRUING
The patterns are attached to a central wax stick or rod, called a sprue, to form a casting cluster or assembly.
 


  3. SHELL BUILDING
The shell is built by immersing the assembly in a liquid ceramic slurry and then into a bed of extremely fine sand. This is done many times always waiting for the previous layer to dry first.


  4. BURNOUT OR DEWAX
Once the ceramic is dry, the assembly is placed in a kiln or furnace and wax is melted out. Thus creating a negative impression within the shell.
 


  5. CASTING
Molten metal is poured into the ceramic shel immediately after the assembly is removed from the kiln.

 


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


   7. CUT OFF & FINISHING
The parts are cut away from the central sprue, inspected and any fragments of the ceramic shell are removed.
 


8. FINAL INSPECTION & SHIP
After a final inspection, the metal castings--identical to the original wax patterns--are ready for shipment to the customer



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