Investment Casting Process: In the Investment Casting Process, the wax is used as a Pattern Material whereas Cement Concrete is used as a Mould Material.
Because of Cement concrete mould, the same mould can be used for producing a few numbers of castings. Therefore, it is also called a Semi-Permanent Mould Casting Process.
Due to cement concrete mould, the surface finish produced will be better.
Because, the thermal conductivity of cement concrete mould is higher than the sand mould, the heat transfer rate will be high. hence, the surface hardening heat treatment effect will be taking place in the casting.
The casting produced by the investment casting process will always have hard surfaces and soft interiors.
Because of very low porosity property of cement concrete moulds, the thorough Risers must be used for escaping the air or gases.
Investment Casting derives its name from the pattern being invested (surrounded) with a refractory material. The fragile wax patterns must withstand forces encountered during the mould making. Much of the wax used in investment casting can be reclaimed and reused.
Explanation of the Investment Casting Process:
- The process is generally used for small castings but has been used to produce complete aircraft door frames, steel castings of up to 300 kg (660 lbs) and aluminium castings of up to 30 kg (66 lbs).
- It is generally more expensive per unit than die casting or sand casting, but has lower equipment costs.
- It can produce complicated shapes that would be difficult or impossible with die casting, yet like that process, it requires little surface finishing and only minor machining.
Past and Present of Investment Casting Process:
- Investment casting is an industrial process based on and also called low wax casting which is one of the oldest known metal-forming techniques.
- From 5,000 years ago, when beeswax formed the pattern to today’s high-technology waxes, refractory materials and specialist alloys, the castings allow the production of components with accuracy, repeatability, versatility and integrity in a variety of metals and high-performance alloys.
Materials used for Investment Casting Process:
- There are a variety of materials that can be used for the investment casting process, including stainless steel alloys, brass, aluminium, and carbon steel.
- The material is poured into a ceramic cavity designed to create an exact duplicate of the desired part.
- Investment casting can reduce the need for secondary machining by providing castings to shape.
Applications of Investment Casting Process:
The materials that can be cast with this process(Investment Casting Process) are Aluminum alloys, Stellite, Bronzes, Valves and fittings, Stainless steels, etc. Glass mould accessory castings, Levers, Gears and Splines are some of the popular usages of Investment Casting Process.
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The PPT shown below provides the step by step procedure for investment casting process.
This is the complete explanation of step by step procedure for Investment Casting Process which is shown in a detailed manner. If you have any doubts, feel free to ask from the comments section. Please Share and Like this blog with the whole world so that it can reach to many.