| 摘要 |
A device for forming a workpiece by pressure waves generated in a liquid due to an undersurface spark discharge has a pair of electrodes mutually separated by the liquid and defining a spark gap therebetween. The electrodes are connected to a spark discharge circuit. One of the electrodes has a stationary part and a moveable part. An ignitor is connected to the moveable part and is thereby moveably insertable into the device so that the ignitor extends across the spark gap between the other of the electrodes and the one electrode. A means for holding a workpiece in a position surrounding the ignitor and the spark gap is also provided.
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