Titanium Flow Patterns caused by Entrance Velocity

Abstract

Several experiments were carried out under small casting forces to study the relationship between the entrance velocity of molten titanium and the flow pattern in the mold cavity. When the spring of the centrifugal casting machine was wound up to 20 (the manufacture's instruction is 38) , the flow was turbulent and its pattern was analogous to that of 38winds, and when it was wound up to 10, a laminar flow was observed.When the pressure casting machine was operated with the pressure adjusted to 0.6kg/cm²(the manufacture's instruction, 1.1kg/cm²), the flow patterns were altered appreciably and pressure dependence of interanal defects varied with the position of the sprue. In addition, the influence of various conditions on the entrance velocity, such as casting force, was theoretically considered.