Shell Mould Casting
TRIA Group is prepared to discuss shell mould casting requirements you may have, and work with you to deliver to your expectations.
Our shell mould casting process offers better surface finish, better dimensional tolerance, and higher throughout due to reduced cycle time. Attributes of our shell mould casting process include:
- First stage – Skin: A heated [200 oC - 375 oC] metal pattern is covered with a mixture of sand and thermoset plastic. This causes a skin of about 3.5 mm (0.125 in) of sand/plastic mixture to adhere to the pattern.
- Second stage – Shell Mold: This skin is removed from the pattern to form the "shell mold". This process can produce complex parts with good surface finish 1.25 um to 3.75 um (50 uin to 150 uin) rms, and dimensional tolerance of 0.5%.
TRIA Group’s size limit on shell moulded castings is 0.5 kg to 25 kg. Minimum thickness can be as low as 1.5mm (0.062 in) to 6.25mm (0.25 in), depending on the material.
Our general casting tolerance is IS +/- 1/32" to 1/16" per inch. The surface roughness is 250 RMS to 500 RMS.