| 摘要 |
A method and a device for producing leadthroughs on a hollow profile useing a high fluidic pressure in an internal high- pressure forming tool. Dome-like secondary shaped elements are formed outwards in a radial direction from this hollow profile by the fluidic pressurizing. The secondary shaped elements are then reverse drawn into the interior of the hollow profile by punches at the prevailing internal high pressure. A punched slug is cut out of the base of the reverse-drawn secondary shaped element by the punch. A bent-in margin of the secondary shaped element lying next to the cutout is then straightened by the punch in a displacing movement directed further inwards by being pressed against a hollow-profile wall. To ensure the process reliability when producing the leadthrough even in the case of a hollow-profile material having low formability and to retain the strength of the hollow profile in the transition region to the leadthrough, it is provided in each case to form a secondary shaped element out of the hollow profile at two opposite locations, to reverse draw the secondary shaped elements after the forming, in each case into the hollow-profile interior by a punch in such a way that the bases are at a distance from one another in a f final state of the reverse drawing, and to sever the punched slug from the respective base by interaction between the fluidic internal high pressure and an encircling cutting edge of the punch. |
