MOLD FILLING BEHAVIOR OF TITANIUM MELT IN THIN- WALLED AND COMPLICATED CAVITIES IN HYPERGRAVITY FIELD

摘要

The mold filling process of titanium alloy in the thin-walled and complicated cavities in hypergravity field is the subject of this paper. The obtained results indicate that the filling process of the melt in the thin-walled and complicated cavity at different mould rotational speeds is quite complex. The free surface of the melt in the thin-walled ribs moves forward in a near planar way parallel to the gravity direction under different mould rotational speeds. The mold filling process with higher filling rotational speed, 300rpm and 500rpm shows that the free surface in the thin-walled ribs and backward filling in the radial runners are in the same vertical plane. Besides, the speed of backward filling in the radial runner is equal to that in the thin-walled ribs. The free surface during the backward filling process at the rotational speeds of 300rpm and 500rpm is a series of arc surfaces, while the free surface during backward filling with 150rpm is not obvious, for the free surface during the forward filling process occupies nearly the whole radial runner.