Casting is a process that goes back some 6000 years to the late Bronze Age. One of the most common methods of casting is by lost wax, which is the primary method used at Panurgic. Here is a pictorial overview of the process.
1. A rubber injection mold of the product is created. Highly detailed molds can be created from anything from a simple sketch to a CAD drawing.
2. Multiple molds form a “tree” and are prepared for the kiln.
3. The wax mold is then placed into a metal flask and covered with investment plaster. The flask then goes into a kiln to melt out the wax from the mold. This is where the term “lost wax” comes from.
4. Raw material, such as gold, silver or bronze, is chosen for the casting. (Panurgic is also one of few local casters — if not the only local caster — who casts jewelry in non-precious metals.)
5. The flask is placed in a centrifuge. Metal is melted until molten and poured into the flask. Moments later, the centrifugal force of the centrifuge forces the metal into the mold, creating a complete casting.
6. The hot flask is removed from the centrifuge and quenched. The sudden change in temperature shatters the investment.
7. The investment plaster is removed, producing a final casting tree of identical raw products.
8. Raw product is hand finished to customer specifications.