| 摘要 |
A method of manufacturing a liner for a composite pressure vessel comprises: (a) Providing an aluminium alloy ( preferably AA7060) cup-shaped shell 10, with closed crown end and open top, a drum region 18 with thinner walls, an end region 20a at the open top with thicker walls and a tapering transition 20b; (b) Cold drawing the shell using a punch (24, figures 4a-e) with cylindrical walls and a shaped upper region (24a) that, during the drawing operation, meets the transition zone 20b; (c) Forming the end region 20a and transition zone 20b to close the top and form a neck; (d) Cutting a thread into the neck. The initial stroke of the punch may form the thicker walled portion to have a smaller internal diameter than the remainder of the shell and withdrawal of the punch may further form the transition zone. The shaped upper region may comprise a convex portion of radius (R1, figure 6) and a concave portion of (R2). The radii are approximately transposed onto the outer surface of the shell upon die withdrawal to a concave radius (R1) and a convex radius (R2). A formula is disclosed for determining the radii R1 and R2. |
