Ingate Velocity of Castings Produced in Air Impulse Molding System

In this study, the practical ingate velocities of some castings produced in air impulse moulding systems, like the back brake drum of Nissan, the crankshaft of Peugeot 405, and the flywheel of Peykan were measured. For each of these segments, the molten metal was filmed as entering the open mould. Afterwards, the theoretical velocities were calculated and were compared with the practical ones obtained from the recorded film.The results showed that the existence of the fraction and heat transfer of the mould cause a considerable difference between the theoretical and practical velocities. It was also found that the ingate velocities in these castings were less than 0.5ms-1, which is lower than the critical velocity.Therefore, the ingate systems used for the production of these castings were suitable according to the ingate velocity of molten metal. So, the defects caused by exceeding the critical velocity were not observed.