# US 2018/0021837 A1 · Electrohydraulic forming device comprising an optimised chamber

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- Number: US 2018/0021837 A1
- Document ID: US20180021837A1
- Status: Published application
- Kind: A1
- Application number: 15/540,940
- Filed: 2015-12-29
- Published: 2018-01-25
- Earliest claimed: 2014-12-29
- Assignees: Adm28 S.àR.L
- Applicants: ADM28 s.àr.l
- Inventors: Gilles Avrillaud; Julien Fuzeau
- Web page: https://patentgrep.com/patent/US20180021837A1

## CPC

- B21D 26/12: initiated by spark discharge
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)

## Abstract

An electrohydraulic forming device includes a mold, a tank having a first wall, and a first electrode and second electrode both placed in the tank and adapted to generate an electrical discharge to create at least one pressure wave. The first wall is rotationally symmetric about an axis of revolution, the electrodes have axes of revolution that are coincident with the axis of revolution of the first wall, and the first wall has a concavity oriented towards the mold.

## Claims

### Claim 1

An electrohydraulic forming device comprising:
a mold,
a tank having a first wall, and
a first electrode and second electrode both placed in the tank and adapted to generate an electrical discharge to create at least one pressure wave, wherein:
the first wall is rotationally symmetric about an axis of revolution,
the electrodes have axes of revolution coincident with an axis of revolution of the first wall, and
the first wall has a concavity oriented towards the mold.

### Claim 2 (depends on 1)

The electrohydraulic forming device according to claim 1, wherein the first wall is of frustoconical shape.

### Claim 3 (depends on 2)

The electrohydraulic forming device according to claim 2, wherein the first wall has a half-angle with respect to an apex of the frustoconical shape, the half angle having a value between 20° and 35°.

### Claim 4 (depends on 1)

The electrohydraulic forming device according to claim 1, wherein the tank comprises a second wall situated between the mold and the first wall.

### Claim 5 (depends on 4)

The electrohydraulic forming device according to claim 4, wherein the second wall is of frustoconical shape.

### Claim 6 (depends on 5)

The electrohydraulic forming device according to claim 5, wherein the second wall has a half-angle with respect to the apex of the frustoconical shape, the half-angle having a value between 20° and 35°.

### Claim 7 (depends on 4)

The electrohydraulic forming device according to claim 4, wherein the second wall is of paraboloid shape.

### Claim 8 (depends on 1)

The electrohydraulic forming device according to claim 1, wherein the electrodes are arranged in line with one another with an inter-electrode space remaining between them.

### Claim 9 (depends on 1)

The electrohydraulic forming device according to claim 1, wherein the electrodes are arranged at a height of the first wall with respect to the axis of revolution.

### Claim 10 (depends on 1)

The electrohydraulic forming device according to claim 1, wherein an adjustable inter-electrode space separates the first electrode and the second electrode.

### Claim 11 (depends on 1)

The electrohydraulic forming device according to claim 1, wherein the tank is made of a metal or a metal alloy.