We developed the new technology for Thixomolding® of magnesium alloys to meet latest market requirements as the following. (1) Flood feed screw to stabilize chips feeding and its melting. (2) High speed and quick response new series machine to improve injection performance. (3) Long nozzle to increase the yield ratio about parts per shot.
In the present study, the influence of the slurry temperature and the gate velocity on the
apparent density of molded products was investigated using a thixomolding machine and a die having
a rectangular parallelepiped cavity. Magnesium alloy of AZ91D was injected into the cavity through a
rectangular gate. The gate velocity was varied from 0.4 m/s to 6.0 m/s and the slurry temperature was
changed between 853K and 903K, respectively. The die temperature was fixed at about 513K. The
results were as follows. The apparent density of the molded products at a constant gate velocity was
decreased gradually with an increase in the slurry temperature in cases the slurry temperature was
lower than 863K, however, it decreased suddenly at around the slurry temperature of 873K, and then
it took an almost constant value when the slurry temperature was over 873K. The apparent density of
the molded products at a constant slurry temperature was decreased greatly with an increase in the
gate velocity in the case the slurry temperature was over 873K, however, it decreases slowly as the
gate velocity increased for cases the slurry temperature was under 863K.
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