Mould for ZL109 aluminum alloy piston for diesel engine was optimized by simulating filling flow field

temperature field and shrinkage holes（porosity）.The numerical simulation results show that the optimized mould exhibits reasonable

in which the filling flow is stable with temperature uniform distribution

and the predictable shrinkage holes（porosity）are located in the riser.The casting quality is improved obviously by production verification

saving cost and improving the product quality.