Process for heading pipe ends and device for implementing it
AssigneeAudi AG and Fahrzeugwerk Werdau
InventorsAndreas Beste, Hansjorg Lipowsky, Jurgen Oswald, Manfred Janssen
Life of this patent
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Abstract
The present invention is a novel device and method of shaping an end of a pipe. One end of a pipe is inserted into a shaped die in such a way that the outer surface of the pipe rests against the interior portion of the die. A piston is then inserted into the pipe in such a way that the outer surface of the piston rests against the interior surface of the pipe. The piston is then forcibly driven into the die against the pipe as to forcibly shape the pipe to a predetermined configuration. The present invention also discloses numerous embodiments to shape a pipe.
Claims21
An apparatus for enlarging an end-wall of a pipe by a plastic deformation process, comprising:
- a die having a cavity and a larger cavity separated by a retaining edge;
- a piston having a piston wall, a plurality of radial bores, and a sealing shoulder;
- inserting the pipe into the die with the end-wall disposed in the larger cavity;
- inserting the piston into the die trapping the pipe therebetween;
- exerting a frontal pressure on the piston and a radial pressure by injecting a pressurized fluid via the radial bores to plastically deform and enlarge the end-wall into a shape defined by the retaining edge, the larger cavity, the piston wall and the sealing shoulder.
A process of enlarging an end-wall of a pipe, comprising:
- providing a die having a cavity and a larger cavity separated by a retaining edge;
- providing a piston having a piston wall, a plurality of radial bores, and a sealing shoulder;
- inserting the pipe into the die with the end-wall disposed in the larger cavity;
- inserting the piston into the die trapping the pipe therebetween;
- exerting a frontal pressure on said piston and a radial pressure by injecting a pressurized fluid via the radial bores to plastically deform and enlarge the end-wall into a shape defined by the retaining edge, the larger cavity, the piston wall and the sealing shoulder.
An apparatus for heading a first end-wall and a second end-wall of a pipe by a plastic deformation process, comprising:
- a die having a cavity residing between a first retaining edge connected to a first larger cavity and a second retaining edge connected to a second larger cavity;
- a first piston having a first piston wall, a plurality of first radial bores, and a first sealing shoulder;
- a second piston having a second piston wall, a plurality of second radial bores, and a second sealing shoulder;
- inserting the pipe into the die with the first end-wall disposed in the first larger cavity and the second end-wall disposed in the second larger cavity;
- inserting the first piston into the die from one end and the second piston into the die from another end trapping the pipe therebetween;
- and
- exerting a first frontal force and a second frontal force correspondingly on said first and second pistons and injecting a first pressurized fluid and a second pressurized fluid correspondingly through the first and second radial bores to plastically deform and enlarge the first and second end-walls correspondingly into a first shape defined by the first retaining edge, the first larger cavity, the first piston wall, the first sealing shoulder and a second shape defined by the second retaining edge, the second larger cavity, the second piston wall, the second sealing shoulder.
Dependencies are inferred from the claim text.