| 摘要 |
<p>TITLE OF THE INVENTION HYBRID EXPANSION APPARATUS AND PROCESS An improved sleeving apparatus and process capable of simultaneously expanding and rolling an interference joint between a reinforcing sleeve and a heat exchanger tube is disclosed herein. The apparatus generally comprises an elongated housing onto which upper and lower rollers are mounted, and upper and lower hydraulic expanders capable of applying a radially expansive force onto a sleeve across the length of the rollers. The rolls in the rollers are driven by a common drive shaft which is coupled to a hydraulic motor. The apparatus includes a torque controller including a torque sensor and a computer for controlling the torque, and hence the rolling pressure, that the rollers place on the inside surface of the sleeve. The torque sensor is mechanically connected to the output of the driving means of the drive shaft, and electrically connected to the microcomputer. The microcomputer is connected to the control valve of the power supply of the hydraulic motor driving the drive shaft. The torque value programmed into the microcomputer of the torque controller may be chosen so that the rolling pressure exerted by the rolls elongates the metal in the sleeve at the interference joint to the same extent to which this metal is contracted by the hydraulic expanders, thereby resulting in a substantially stress-free joint.</p> |
