| 摘要 |
A method of manufacturing a fuel rail for use in a fuel delivery system, such as for an engine in a vehicle, includes the initial hydroforming step to deform a central portion of a workpiece to have one or more outwardly extending node portions, followed by a subsequent hydroforming step to deform one or more end portions of the workpiece to have additional outwardly extending node portions. To do this, a pair of pressure feed pistons are disposed within the interior of the workpiece and have head portions that sealingly engage the inner surface of the workpiece so as to define a pressure chamber therein. Pressurized fluid is introduced into the pressure chamber so as to deform a portion thereof into conformance with the portion of the die cavity located within the pressure chamber. Then, the pressure feed pistons are moved to re-define the pressure chamber within the workpiece. Pressurized fluid is again introduced into the enlarged pressure chamber so as to deform other portions of the workpiece. The deformed workpiece is lastly subjected to conventional machining and/or metal working operations to provide a final fuel rail. |
