| 摘要 |
Flow of viscous molten metal (12) to thin sections (48) of mold cavities (14) is difficult to attain thus resulting in inferior molded products. This problem is solved herein by generating waves (20) in the molten metal (12), sensing the waves (20) in the molten metal (12) at a thin section (48) of the mold cavity (14) spaced from the generating position of the waves (20), and controlling the generating responsive to the waves (20) sensed. Basically, a control circuit (56) increases the amplitude, and/or changes the frequency, of the waves (20) generated, if the waves (20) sensed are not sufficiently strong. The invention is useful for flowing other liquids besides molten metal in other cavities than in molds, although this is its prime contemplated use.
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