Method and device for forming a workpiece by application of a high internal pressure
AssigneeDaimlerChrysler AG
InventorsArndt Bikert, Stefan Bobbert
Life of this patent
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Abstract
The invention relates to a process and an apparatus for the internal high-pressure forming of a workpiece in a closed internal high-pressure forming die. In the present invention, the workpiece is expanded by a fluidic internal high pressure exerted by a pressure generator and the workpiece is brought to bear against the cavity of the forming die. To improve the process reliability during the internal high-pressure forming of the workpiece, it is proposed to introduce the internal high pressure in the form of a pressure oscillation.
Claims23
Process for the internal high-pressure forming of a workpiece in a closed internal high-pressure forming die, the workpiece being expanded on account of the fluidic internal high pressure exerted by a pressure generator and being brought to bear against a cavity of the forming die, wherein the internal high pressure is introduced in the form of a pressure oscillation.
Apparatus for an internal high-pressure forming of a workpiece, having an internal high-pressure forming die which is divided along the extent of the workpiece and having a pressure generator which is fluidically connected to the forming die and intended for exerting a fluidic internal high pressure on the workpiece, wherein the apparatus includes a pressure oscillator, by means of which the internal high pressure can be introduced into the workpiece as a pressure oscillation.
A process for forming a workpiece in a closed internal high-pressure forming die comprising:
- providing a tubular workpiece in a cavity of the forming die;
- generating a high pressure fluid with a pressure generator;
- providing a pressure oscillation to the high pressure fluid;
- supplying the high pressure fluid having the pressure oscillation to the cavity;
- and
- expanding the workpiece against the cavity of the forming die by the high pressure fluid having the pressure oscillation.
An apparatus for forming a workpiece by internal high-pressure comprising:
- an internal high-pressure forming die including a cavity for a tubular workpiece;
- a pressure generator fluidically connected to the cavity of the forming die by a delivery line for supplying a high pressure fluid to an interior of the tubular workpiece;
- and a pressure oscillator fluidically connected to the high-pressure fluid generated by the pressure generator and operable to impart a pressure oscillation to the high-pressure fluid.
Dependencies are inferred from the claim text.