An investment casting is multi layered process that is designed to yield high production rates, particularly for small or highly complex components that require a superior surface finish. For quality to cost, the process offers unrivalled performance benefits.
The method also does away with the need for course machining as well as allowing for a greater diversity in design.
A wax mould of the component to be cast is produced by injection-moulding high-technology wax into a metal die. A number of wax components are then mounted on to a wax runner which is then dipped (or invested) in to a ceramic slurry. Further layers are added and then dried to give the shell sufficient durability for the molten metal.
The wax is removed (for this reason, the process is sometimes called a lost wax process) and the shell is then fired to leave a ceramic impression of the part to be cast, in to which molten metal is poured.
Once the metal has cooled, the shell is removed leaving a casting that requires little or no finishing.
Tools are generally quicker and lower cost to produce than with alternative casting methods, they last longer and are easily modified. Castings can be produced in a wide range of metals.
The investment casting process, also known as the lost wax method has been in use for thousands of years. The ancient Egyptians used this process to make jewellery and other ornate objects.
|Up to 13mm +/- 0.08mm||(up to 1/2" +/- 0.003)|
|Up to 25mm +/- 0.13mm||(up to 1” +/- 0.0005)|
|Over 25mm + 0.13mm per 25mm||(over 1” +/- 0.0005 per inch)|
|No closer than +/- 0.5 degrees|
|Up to 6mm + 0.08mm||(up to 1/2" + 0.003)|
|Up to 25mm + 0.13mm||(up to 1" + 0.005)|
|Over 25mm + 0.10 per 25mm||(over 1" + 0.004 per inch)|
|Outside diameter||18mm 25mm 38mm 51mm|
|Inside diameter||6mm 13mm 19mm 25mm|
|T.I.R Eccentricity||0.2mm 0.25mm 0.3mm 0.38mm|
|Diameter||up to 13mm 13mm to 25mm 25mm to 38mm|
|Ovality T.I.R||0.25mm 0.3mm 0.4mm|
|+ 0.1mm per 25mm depending on configuration|
|A witness of approximately 0.25mm will be left in position shown on the marked up drawing sent with our Form of Supply.|
Parts can be cast in a wide range of materials.