| 摘要 |
<p>A degassing apparatus for a mold includes a degassing valve (1), an acoustic wave detecting unit (19), and a valve closing unit (23). The degassing valve is located at an end portion of a degassing passage (8) extending from a mold cavity. The acoustic wave detecting unit is arranged midway along the degassing passage and detects an acoustic wave generated when a molten metal collides against a wall surface of the passage, and thereby detecting passing of the molten metal. The valve closing unit closes the valve when a detection signal level is higher than a reference signal level.</p> |
