Schematic representation of the pneumatic ball vibrator used to generate low frequency vibration of the mold: (a) front view and (b) side view.
Schematic representation of the experimental set-up developed to vibrate the metal upon solidification: (a) front view and (b) top view. The designation of main vibration axis is indicated.
Transverse vibrations amplitude and peak acceleration as a function of the vertical position on the beam. The mold/vibrator distance is maintained constant at .
Acceleration of mold vibrations as a function of the mold/vibrator distance for an input pressure of 2.8, 4.1, and 5.5 bar: (a) longitudinal axis and (b) transverse axis.
(a) Amplitude and (b) frequency of longitudinal vibrations as a function of the mold/vibrator distance.
As-cast structure of AZ91D alloy cast (top) without and (bottom) with mold vibrations.
As-cast structure of pure magnesium cast (top) without and (bottom) with mold vibrations.
Improved setup to separate the base plate of the apparatus from the ground. The gap between the bolts and the base plate is exaggerated for clarity.
Unloaded frequency and force output of the pneumatic ball vibrator as a function of pressure input (Ref. 12)
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