Jewellery casting is an art form that dates back to thousands of years. Modern technology, however, has developed some processes to enhance the craft.
Casting jewellery is now dynamic compared to how it was ages ago. A new process called lost wax has even replaced traditional jewellery casting in the UK. Wax carving, printing, or growing creates models of jewellery, then placed in investment, a term jewellers use for a plaster-like encasement. To create an impression, jewellers subject the investment to extreme heat, and the cavity left through this process becomes a mould for molten precious metal.
Here are some other casting methods:
Precious Metal Castings
When flasks are filled, precious metal castings are removed. They are left to cool or dipped in water. When cooled, the investment form is shattered. The remaining plaster is broken off, which leaves a treelike form with the models found in the branches. The models are cut off from the tree and are sent for jewellery polishing, stone setting, and fabrication. Similar results occur in the following methods as well.
Centrifugal Jewellery Casting
This method uses centrifugal force to throw precious metal into a hollow cavity. This usually involves placing metal on a swing arm or cradle while heating a crucible at intense temperatures. When heated enough, jewellers sling the metal towards it to fill a flask.
Vacuum Casting Jewellery
Unlike centrifugal jewellery casting, this method sucks molten metal into a flask before cooling.
Burn Out Cycle
In this method, resin type materials and wax models are connected to each other, forming a tree-like piece. The arrangement of models allows the metal to flow through this tree suspended inside a flask. They then fill the cavity with plaster slurry. Afterwards, negative atmosphere removes air pockets and bubbles in the slurry. Upon hardening, they are placed in ovens with high temperatures.
Casting uses processes depending on the type of metal used, colour, and karats. Because of this, it’s important to consider a jewellery casting expert in the UK. They should know what they’re doing.