Process of Investment Casting

Milwaukee Precision Casting, Inc. uses the investment casting process to benefit our customers. The investment casting process provides incredible design flexibility, numerous material options, and superior quality. Best of all, investment casting is typically more cost effective than traditional casting methods.

  1. Create a wax model of casting part, using high temperature wax injected into an aluminum molding tool.
  2. Attach the wax models to a gate or system. Multiple patterns are assembled to allow for large quantities to be produced at one time.
  3. Dip the system into ceramic, building up layers until it is thick enough. This shell is typically built to approximately 3/8” thick.
  4. Melt the wax out of the cavity, leaving a hollow ceramic outer layer.
  5. Heat the cavity, to prevent shock from the temperature of the metal, and pour the metal into the ceramic shell.
  6. Let the metal cool.
  7. Using strong vibrations, remove the ceramic shell.
  8. Saw the parts off the system.
  9. Grind until the part meets specifications of original part. Some parts may require additional heat treating. Depending on tolerance requirements, some secondary machining might be required for proper function.
  10. Measure the new part using advanced tools to make sure the new part is an exact duplication of the original casting.

Investment Casting Process Materials

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

Visit our investment casting vs sand casting page to learn more about the benefits of investment casting.