Through an analysis of investment castings of typical titanium alloy（Ti-6Al-4V）parts with slender structure by both methods of computer simulation and actual production

effects of titanium alloy part structure on the casting technique were expounded.The correspondence between computer simulation and actual results at different stages was compared to understand the positive guidance and limitation of computer simulation on castings technique.The results show that various casting techniques have little effect on the mold filling process

and the main difference appears on the inside defection at local position.There are limitations on the casting technique according to experience of typical structure.The computer simulation for shrinkage cavities are consistent with actual ones

while the results of gas defection are weak.And the final casting technique needs the optimization of both computer simulation and actual results.