An Example in Steel  Casting  --  Lever Arm in the BMW Engine Valve Train

Lost Wax Investment Casting
The basic steps of the investment casting process are:

  1. Production of heat-disposable wax or plastic patterns in a precision tool.

  2. Assembly of these patterns onto a gating system.

  3. “Investing,” or covering the pattern assembly with ceramic to produce a monolithic mold.

  4. Melting out the wax pattern assembly to leave a precise mold cavity. Firing the ceramic mold to  cure the ceramic mold.

  5. Preheating the mold for casting and pouring the metal into the mold.

  6. Knockout, cut-off, finishing, and inspection of the casting.
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