| 摘要 |
In a method and a device for producing a circumferentially closed hollow profile, a hollow-profile blank is expanded by fluidic internal high pressure in an internal high-pressure forming tool, after which the hollow-profile blank assumes the final shape of the hollow profile. In order to make it possible in a simple manner to have a production of a hollow profile in which process reliability is ensured to a sufficient extent even in the case of high expansions of the hollow profile (higher than or equal to the breaking elongation of the material), during expansion, the hollow-profile blank is supported, on at least one partial circumferential region, by at least one diaphragm fastened to the inside, facing the blank, of the tool and capable of being acted upon by a controllable pressure acting from outside, the diaphragm shifting back elastically as expansion progresses, with the supporting pressure acting on the diaphragm being reduced at the same time.
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