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Investment casting is an industrial process based on and also calledlost-wax casting, 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. Lost-foam casting is a modern form of investment casting that eliminates certain steps in the 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 aluminum casting 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.
Advantages of Investment casting
1.Many Intricate forms with undercuts can be cast
2..A very smooth surface is obtained with no parting line.
3.Dimensional accuracy is good.
4.Certain unmachinable parts can be cast to preplanned shape.
5.It may be used to replace die-casting where short runs are involved.
Disadvantages of Investment casting
1.This process is expensive, is usually limited to small casting, and presents some difficulties where cores are involved.
2.Holes cannot be smaller than 1/16 in. (1.6mm) and should be no deeper than about 1.5 times the diameter.
3.Investment castings require very long production-cycle times versus other casting processes.
4.This process is practically infeasible for high-volume manufacturing, due to its high cost and long cycle times.
5.Many of the advantages of the investment casting process can be achieved through other casting techniques if principles of thermal design and control are applied appropriately to existing processes that do not involve the shortcomings of investment castings.
precision casting iron: http://www.fotaichina.com/
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 aluminum casting 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.
Advantages of Investment casting
1.Many Intricate forms with undercuts can be cast
2..A very smooth surface is obtained with no parting line.
3.Dimensional accuracy is good.
4.Certain unmachinable parts can be cast to preplanned shape.
5.It may be used to replace die-casting where short runs are involved.
Disadvantages of Investment casting
1.This process is expensive, is usually limited to small casting, and presents some difficulties where cores are involved.
2.Holes cannot be smaller than 1/16 in. (1.6mm) and should be no deeper than about 1.5 times the diameter.
3.Investment castings require very long production-cycle times versus other casting processes.
4.This process is practically infeasible for high-volume manufacturing, due to its high cost and long cycle times.
5.Many of the advantages of the investment casting process can be achieved through other casting techniques if principles of thermal design and control are applied appropriately to existing processes that do not involve the shortcomings of investment castings.
precision casting iron: http://www.fotaichina.com/
