The needle hole can be observed in the processed plane of camshaft bracket in the production process.Although the air vent was set at corresponding place of mold

there still was absent in remarkable improvement on the defect of pore.In order to understand origination of the gas hole

based on the CAE technology

the filling and solidification process was simulated.According to the simulated result

the exhausted-overflow system was modified.The results reveal that gas holes in the camshaft bracket are decreased obviously by actual production

and product quality is improved.