Investment casting (known as lost-wax casting in art) is a process that has been practised for thousands of years, with the lost-wax process being one of the oldest known metal forming techniques. From 5000 years ago, when bees wax formed the pattern, to today’s high technology waxes, which Hunta expertly utilises, refractory materials and specialist alloys, the castings, ensure high-quality components are produced with the key benefits of accuracy, repeatability, versatility and integrity.
The process is suitable for repeatable production of net shape components, from a variety of different metals and high performance alloys. Although generally used for small castings, this process has been used to produce complete aircraft door frames, with steel castings of up to 300 kg and aluminium castings of up to 30 kg. Compared to other casting processes such as die casting or sand casting, it can be an expensive process, however the components that can be produced using investment casting can incorporate intricate contours, and in most cases the components are cast near net shape, so requiring little or no rework once cast.
Some of the metal casting products manufactured and fabricated by Hunta’s foundry using investment casting are marine four vane propellers, turbine blades, crusher rollers, armament parts, pipe fittings, lock parts and others.
Some advantages of investment casting :
- many choices of material
- excellent finishing of product surface
- may require none to little secondary machining
- able to produce complex shapes and accurate detailing
- products have high strength