| 摘要 |
<p>An ultra high-pressure fluid pulse (12) performs metal working operations, including joining and cold working. In one application, an ultra high-pressure fluid pulse (12) is directed into a hollow rivet (14) seated within an orifice formed in two metal sheets (18, 20), causing the fastener (14) to expand outwardly, in an interference fit with the orifice joining the metal sheets (18, 20) together. The ultra high-pressure fluid pulse (12) can alternatively be applied to the metal sheets (18, 20), plastically deforming them into a cavity to form a clinch fastener joint (102). Further, the ultra high-pressure fluid pulse (21) is usable to plastically deform the interface between stacked metal sheets (18, 20) or other components into surface features provided on one of the sheets (18, 20), to form a mechanical interlock. An ultra high-pressure fluid pulse generator (10) includes a fast acting valve (34) that opens to enable an ultra high-pressure pulse (12) to pass through a tapered fluid channel (12) in the nozzle (46).</p> |
