B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 53/88 (2006.01) B21D 26/02 (2006.01)
Patent
CA 2366209
The invention relates to a method and a device for producing a circumferentially closed hollow profile, a hollow-profile blank being expanded by means of fluidic internal high pressure in an internal high-pressure forming tool, after which said hollow-profile blank assumes the final shape of the hollow profile. In order to make it possible in a simple way 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), it is proposed that, during expansion, the hollow-profile blank be supported, on at least one partial circumferential region, by means of 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, said diaphragm shifting back elastically as expansion progresses, with the supporting pressure acting on the diaphragm being reduced at the same time.
Daimlerchrysler Ag
G. Ronald Bell & Associates
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