Patent ID: 7021150

Claim:
Process for the hydraulic expansion of a tube against a retaining opening of an adjoining component, in which pressure is produced in the pressure medium with a hydraulic oil via a media separator and a pressure intensifier comprising: a) a probe inserted into a tube member to be expanded wherein the tube member is surrounded on the outside by a retaining opening; a sealings attached to the probe that seals off an expansion space between the tube member to be expanded and the probe; b) wherein the pressure medium is pressurized in a fill time of at least 1 s and at the most 20 s in the pressure intensifier that is connected to the probe, the probe ( 2 ) and the expansion space, and wherein the medium separator produces a filling pressure in the pressure medium that amounts to 1.3 to 1.5 times, preferably 1.4 times the hydraulic pressure; c) and wherein an expansion pressure is built-up in the pressure medium in a pressure build-up time of at least 1 s and at the most 20 s, whereby the expansion pressure in the pressure medium is increased by the pressure intensifier to 13 to 15 times, preferably 14 times the hydraulic pressure; d) wherein the expansion pressure in the pressure medium is maintained for a predetermined expansion time of at least 1 s and at the most 10 s; and e) wherein the expansion pressure is reduced automatically at the end of the expansion time.