The centrifugal casting process of graphite mould for a titanium alloy baseboard used for a chemical equipment was introduced.And origination of shrinkage porosity in the castings was analyzed.By increasing the centrifugal rotational speed and changing riser position

such as the centrifugal rotational speed increased from 150r/min to 220r/min

the original overhead vertical riser biased 60 mm along radial direction

shrinkage porosity in the baseboard was eliminated.For the large baseboard castings including stiffened plate

some measures were adopted

such as pouring gate with fully convered the stiffened plate

using gravity for stiffened plate feeding

and with help of the combined action of centrifugal force and gravity to realize the complete filling of 3mm reinforced plate

the qualified titanium alloy baseboard castings were produced finally.