METHOD AND DEVICE FOR PRODUCING A PERIPHERALLY CLOSED HOLLOW PROFILE

摘要

The aim of the invention is to allow for the production of a hollow profile (3) using secondary forming elements and/or junctions (4), wherein the cover (11) of the secondary forming element and/or junction (4) can be removed in a simple and reliable manner. For this purpose, the cover (11) of the secondary forming element and/or the junction (4) is removed under internal high pressure that does not exceed the forming pressure for producing the hollow profile (3) from the blank, the removal being brought about by the sole lift of the counter-mold (5, 17) that acts in the direction opposite to the direction of expansion of the hollow profile (3). The face (8) of the counter-mold (5, 17) is a continuous even structure, and the end edge (12, 21) of the mold (5, 17) forms the contour of separation. The width of the annular gap (22) between the wall (14) of the passage (7) produced by the forming tool (2) in which the mold (5, 17) is displaceably guided and the mold circumference (13) corresponds approximately to the wall thickness of the secondary forming element or junction (4).