| Forming of dished ends is achieved in one of three ways:
1. Completely spun - Ends formed using this technique are spun over a tool, which has both the spherical and the knuckle radii. This allows the end to be formed entirely on one spinning machine. 2. Press and Flanging - A contract specific spherical radius is formed using specialist hydraulic Boldrini presses. Following this the required knuckle radius is spun using Boldrini flanging units. 3.Spin and flanging - Unlike pressing, the spherical radius is formed by spinning the plate blank against a fixed forming tool. Forming of the knuckle radius is made in the same way as pressed ends. |