A process for forming an initial section or like component featuring a
hollow interior to a final shape by high internal pressure in the sealed
hollow interior using a medium that can flow. In order to shape-form the
initial section featuring at least one corner region--preferably at least
two corner regions--the wall sections adjacent to the corner region are
preshaped in a curved manner--as viewed in cross-section--counter to the
direction of applied pressure, and subsequently re-shaped by applying the
high internal pressure of the medium that can flow, displacing the corner
region in the direction in which the pressure is applied. To that end a
section with hollow space delimited by section walls is employed in which
two section walls define each corner region of the section cross-section,
whereby at least one of the section walls at the corner region features a
region that is curved in cross-section. Preferred is a polygonal
cross-section, the section walls of which feature the inwards curved
region between each of the corner regions or, such in which selected
section walls connecting two corner regions each feature a curved region.
