| 摘要 |
<p>In a tube expanding technique for securing a sleeve (22) within a tube (24), fluid pressure is applied via a tube expander by incrementally decreasing the volume of the fluid system exclusive of the expander, or by incrementally increasing the mass of the fluid within the system. The system pressure and the rate of pressure increase are monitored as a function of incremental change in volume or mass. A decrease in the rate is indicative of the onset of plastic expansion of the sleeve (22) or tube (24), as the case may be. By determining this point, outer diameter of the tube may be accurately controlled to within 0.15 mm The tube expander includes a distensible sealed bladder (10) for applying the expanding pressure, the bladder (10) containing the system fluid.</p> |
