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Investment Casting

Sand Casting
Shell Mould Casting
Centrifugal Casting
Gravity Die Casting
Pressure Die Casting
Forging Process
Extrusion Process

CNC Products provide for Valves, Pumps,
and Textile Industries.

The metal pattern is first heated at a temperature of 200 0 C / 392 0 F.Then covered with a mixture of sand and thermo set plastic. It forms a skin of sand/ plastic mixture of about 3.5 mm (0.125 inch) which adheres to the pattern. The shell mold is formed after the skin gets removed from the pattern. The two halved of the shell mold are secured together and the metals id poured in the shell to form the part. Once the metals solidified, the shell is broken.
Features of Shell mold Casting:     

Good Surface Finish : 1.25µm to3.75µm (50µin to 150µin)rms dimensional To-
-lerance of 0.5 %       
Size Limits : 30 g to 12 kg (1 oz to 25lb)
Minimum Thicknesses :  As low as  1.5mm (0.062 in) to 6.25mm (0.25 in) de-
-pending on the material
Superi or Machining Qualities :  As it has soft skins and hard or dense interiors
Draft Allowance :  Typically 10 C

The materials that can be used with this process are aluminum, cast irons, and copper alloys. Parts made can be connecting rods, Gear Housings, Lever arms etc.