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117:). During the 1950s and early 1960s, the basic process was developed into production systems. This work principally was by and for the aerospace industries. By 1970, forming machines based on submerged arc discharge were available from machine tool builders. A few of the larger aerospace fabricators built machines of their own design to meet specific part fabrication requirements.
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system. This process is not limited by size and allows forming of parts up to a few square meters in size. An array of electrodes can be placed over a large workpiece, enabling pressure distribution according to the product’s topology, still using a one-sided die to create complex shapes and fine details.
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Electrohydraulic forming (EHF) is based on the ultra-high-speed deformation of metal using shockwaves in water. Using the discharge of current from a capacitor bank, an electric arc is generated in water between two electrodes. This electric arc vaporizes the surrounding water, converting electrical
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The shockwave simultaneously transforms the metal workpiece into a visco-plastic state and accelerates it into a die, enabling forming of complex shapes at high speeds in cold conditions. All of which happens in a matter of milliseconds; total cycle time of seconds including charging time of the
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Very large capacitor banks are needed to produce the same amount of energy as a modest mass of high explosives - which is expensive for large parts. On the other hand, the electrohydraulic method was seen as better suited to automation because of the fine control of multiple, sequential energy
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and change the shape of the workpiece. A capacitor bank delivers a pulse of high current across two electrodes, which are positioned a short distance apart while submerged in a fluid (water or oil). The electric arc discharge rapidly vaporizes the surrounding fluid, creating a shock wave. The
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The potential forming capabilities of submerged arc discharge processes were recognized as early as the mid-1940s (
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Enables extremely deep forming (much more than is possible with conventional stamping)
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US department of Energy (2011) Electrohydraulic forming of near net automotive parts
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discharges and the relative compactness of the electrode-media containment system.
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workpiece, which is kept in contact with the fluid, is deformed into an evacuated
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No need for a press – the forming chamber is a self-balanced system
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Allows forming of parts up to a few square meters in size
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Forming of male and female shapes (negative and positive)
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A single-step process (rather than progressive stamping)
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energy into an intense shockwave of mechanical energy.
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Even distribution and higher strength of thin material
141:Fine details and sharp lines can be easily formed
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203:Electro-hydraulic forming illustration from Bmax
43:but its sources remain unclear because it lacks
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74:Learn how and when to remove this message
147:Only a single one-sided die is required
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159:Equipment has small footprint
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339:Electrohydraulic forming
87:Electrohydraulic forming
29:This article includes a
344:Electromagnetic forming
58:more precise citations.
329:Casting (metalworking)
95:electric arc discharge
550:Tools and terminology
379:Progressive stamping
93:process in which an
455:Finishing processes
31:list of references
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418:Joining processes
349:Explosive forming
317:Forming processes
133:Advantages of EHF
103:mechanical energy
99:electrical energy
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409:Tube bending
364:Hydroforming
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181:Hydroforming
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50:Please help
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520:Fabrication
468:Galvanizing
308:Sheet metal
298:Fabrication
282:fabrication
115:Yutkin L.A.
56:introducing
540:Metallurgy
483:Patination
303:Piece work
187:References
535:Machining
530:Jewellery
498:Polishing
463:Anodizing
440:Soldering
354:Extrusion
64:June 2024
570:Category
545:Smithing
435:Riveting
430:Crimping
399:Spinning
384:Punching
369:Stamping
176:Ignitron
170:See also
555:Welding
525:Forming
515:Casting
493:Plating
488:Peening
445:Welding
425:Brazing
404:Swaging
394:Sinking
389:Rolling
359:Forging
334:Drawing
324:Coining
291:General
278:Forming
52:improve
37:, or
108:die
101:to
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