Examples of sand cast components and investment casting

Housing figure for a rotary engine developed by Engineering Norton for motorcycles and both thick (15 mm) and thin (2 mm outer shroud) sections. This is sand casting, but filled by gravity, showing that systems can fill simple to work well for many castings and system is not filling up the hill always necessary (although it would almost always produce good solutions). In Figure We now set three sand castings used by the aerospace industry. This is a lightweight space frame for a pilot ejector seat. Figure shows the air intake for the engine Rolls Royce Gem powers of the Lynx helicopter, and more complex air intake figure for aerospace engine produced in France.

I would now like to turn to yet another completely different area of ​​foundry technology: investment casting. This is of course, widely known as lost wax casting, because the use of stock wax coated with refractory (ie the stock to invest in layers alternate slurry and stucco), the stock wax melted out later to leave a hollow shell into which the metal is cast. The elegant die from Deritend Precision Castings, Droitwich, United Kingdom makes the impeller in wax patterns. The center made of steel, bronze used for the sliding inserts. Figure is a series of wax patterns together into a system running commonly called tree and hand dipped into a ceramic slurry.

The coated pattern is removed, coated in stucco refractory and allowed to dry. The dipping process is repeated many times until you have enough thickness shell of built up, usually a minimum of ~ 7 mm. Until recently, the amount of investment castings is limited by the amount of shell could be manhandled. The overall picture is a modern facility for making ceramic shells shown in Fig. A series of slurry tank and the stucco fluidized beds arranged around a robot. The increased transport weight capacity available by registering revolutionized the investment casting industry, because it is now possible to make castings with overall dimensions of a meter or more.