Investment Casting

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Investment Casting is commonly referred to as the “lost wax casting process”. Here's how the process works. First, high temperature wax is injected into a ceramic shell mold to form a pattern. The wax is then removed from the mold after it has cooled. The pattern created by the removed wax form now resembles the component. This mold is then heated in a fire oven, and molten metal is poured into the mold. After the metal has cooled and set, the precision castings are cleaned and subjected to further heat treatments. Depending on the specific design requirements, some machining may be performed to bring the castings to their precise final form.

Investment casting is an extremely cost effective and highly accurate process. Also, many high strength and corrosion resistant materials can be used in investment casting, including:

  • Low to high carbon alloy steel
  • Tool steel
  • Stainless steel
  • Nickel base alloys
  • Cobalt base alloys
  • Aluminum alloys
  • Brass alloys

 

Intricate parts that would be expensive or impossible to machine are most suitable for investment castings. Fine detail such as splines, holes, bosses, lettering, logos, serrations and even some threads can be cast in.

In many cases the cast parts can be made of more durable alloys at less cost. Often two or more parts of an assembly can be cast as one part. Scrap losses can be reduced to a minimum. In general, you get a better part from investment casting - for less money.

Undergiven are some of the major advantages of investment casting technology:

  • Cost Reduction
  • Close Dimensional Tolerances
  • Weight Reduction
  • Design Flexibility (most shapes can be cast)
  • Reduces or Eliminates Machining
  • Superior Surface Finish (125 rms)
  • Alloy Selection for Difficult or Impossible to Machine Parts
  • Production Runs Can Be Small or Large
   
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