Does Pressure Sequence Hydroforming use axial end feeding to counteract tube wall thinning in the hydroform die?
A- No, because the PSH process forms the finished part profile by reshaping the tube rather than stretching it, wall thinning does not occur in the hydroform tool thus eliminating the need to compensate for it. It should be noted that for thin wall (greater than 40 D:T) tube axial end feeding is only effective for approximately 100 mm from the end of the tube. Beyond that distance friction between the tube and die cavity will effectively negate the benefit of axial end feeding.
