About Lost-wax casting
For unique pieces or reduced productions in metal alloy investment casting may be used. The process is also known as lost-wax casting because the master that produces the mould into which the molten metal is poured is destroyed and must be recreated each time for each individual production.
First, we create a silicone mould to pour wax into to form the sacrificial master. This is coated in plaster that once solidified becomes the mould to be subsequently destroyed. The liquid metal is poured under vacuum into the new mould to fill the cavity left by the wax master and obtain the final product. For the production of just a few pieces, a sintered polystyrene prototype may be used directly as the master for the plaster mould in order to save creating the silicone mould.
Lost-wax casting is particularly useful for the realization of both light and heavy weight complex geometries and when raw materials have a high melting point or are difficult to work with CNC machines or tools. Thanks to the versatility of the process, you can vary quantities without negatively influencing the price of individual components.
Depending on particular form and end use, these pieces may be machined to eliminate surplus material or to introduce holes or threads as per technical design, or can simply be cleaned or polished before they are ready for assembly on the finished product.
The most common applications of lost-wax casting are in consumer and industrial automotive manufacturing, mechanical engineering, aerospace and agriculture. The methodology also dominants in the goldsmithery industry, but is applied via sector-specific techniques.
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