In order to realize all of the advantages of Investment casting, it is important to understand the basic production techniques.

 

 

Step 1.
The process begins by injecting wax into a die. This die can be simple as a one cavity manual or a complex multi-cavity automatic, depending on quantities desired. One wax pattern is needed for each casting. These wax patterns are exact replicas of the required part with one exception. They are slightly larger to offset volumetric shrinkage during pattern production and also in metal solidification.

 
       
  Step 2.
The removal of the wax pattern.
 
       
  Step 3.
After all wax patterns have been shot, they will be assembled on a wax runner to form the "tree". The engineering department has designed the tree for maximum number of parts that will yield the most attractive price to the customer without sacrificing quality.
 
       
  Step 4.
The tree is now "invested" by dipping it into a ceramic slurry followed by a coat of stucco. This process will be repeated six or seven times to build strength in the shell.
 
       
  Step 5.
The "shelled" tree after sufficient drying time is now placed in a steam autoclave to melt out the wax patterns and runner, leaving a ceramic shell with cavities mirroring the casting shape desired.
 
       
  Step 6.
The next step in the process is to fire the shell molds, to burnout the residual wax that was left by the autoclave. The firing also preheats the shell in preparation for casting.
 
       
  Step 7.
Gas fired or electric crucible furnaces are normally employed to pour metals. The molten metal is ladled out of the furnace and poured into the shell filling the cavities and runner system.
 
       
  Step 8
The last step in the process is knockout and finish. The shell is removed from the cast material by vibration and or chemical cleaning. The cast parts are then removed from the runner system by means of a cutoff wheel or a band saw. The parts are then cleaned and finished to suit.
 
       
  Step 9.
Another Satisfied Customer.
 


 

 
 

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