ATOMIZATION IN HIGH-PRESSURE DIE-CASTING - A PROBLEM AND A CHALLENGE

In this study, the important role of atomized now (jet now) in high pr essure die casting manufacture is cited. A series of experimental stud ies with a water analogue were conducted. It was found that the critic al gate velocity for lull atomization of water under the conditions of this study wets about 19.6 m/s. A formula wets used to estimate the c ritical gate velocity of liquid aluminium by correlating the difficult y of water to atomize with that of liquid aluminum via surface tension and other parameters. As a result, liquid aluminum was found to be ab out 3.33 times more difficult to atomize than water Hence, it wets est imated that liquid aluminum might be fully atomized at a: gate velocit y higher than 65 m/s. Furthermore, based on some reports in die castin g practice, it is suggested that atomization in high pressure die cast ing might not be always regarded as a consistent problem, but might pr ovide some solutions for extremely thin wall die casting manufacturing to explore new markets in the electronics and communications industri es.