Electrohydraulic forming, also called electric discharge forming, is a unique high energy forming process for sheet metal. Author links open overlay panel aashish rohatgi a elizabeth v. Electrohydraulic forming ehf, highvelocity forming technology, can improve the formability of a workpiece. This multimaterial capability will allow vehicle manufacturers and their suppliers to make the necessary investments to bring ehf into commercial applications because they will not. The strains in the neck and maximum safe strain regions were carefully.
The image used in this video is derived from an animation created by wikimedia commons user luigi chiesa, and licensed under the creative commons attributionshare alike 3. First results of srf cavity fabrication by electro. Electrohydraulic forming of near net shape automotive panels. Electrohydraulic load sensing with a speedcontrolled hydraulic supply system on formingmachines. Solenoid valves form the interface between the electrical signal control section and the hydraulic power section. Magnetic pulse and electrohydraulic processes for forming. The electrode assembly may include a replaceable conical receptacle that facilitates placement of an electrode tip an insulation sleeve tip. The most common use of hydraulic power is linear motion and the most important factor in. Geometrical shapes and strain distributions were evaluated after forming. Us9056346b2 electrode assembly for electrohydraulic. Smart hydraulic actuator compound move and force control. An electrode assembly for electrohydraulic forming tool in which the insulation sleeve is assembled over an electrode rod. The insulation sleeve has a deflection surface that is beveled or oriented at an angle relative to the axis of the electrode rod. The forming processes are affected by the rates of strain used.
Controls the flow of hydraulic fluid by means of solenoid valves. Forming forming by high speed punch using an agent elastic material. Electrohydraulic forming of sheet metal rachel sharp corinne packard isaac feitler hao hu third update march 6, 2003 today effects of highvelocity metalworking update on progress design alterations next steps highvelocity metalworking includes electrohydraulic, electromagnetic, explosive, and pneumaticmechanical processes deformation velocities 100 fps hydraulic press 0. Mp technology is a fundamental enabler of such processes, being the only technology that can achieve the high deformation speeds required, and yet be user friendly and generally viable for industrial use. View pdf catalogues and other online documentation prices are pretax. The object of this book is to teach you more about hydraulics and its. As a forming process with a highstrain rate, the ehf process produces a shockwave and pressure during the discharge of. In one case free forming was performed and in the other case forming was. A bank of capacitors is first charged with high voltage, and then discharged across a gap between two electrodes. Electrohydraulic forming thanks to years of conclusive research and development at bmax, our industrialgrade electrohydraulic forming ehf systems are today available off the shelf, making this advanced processing more accessible than ever.
Two electrodes, with a wire connecting them, are submersed in liquid. The deformation history of dp600 during electrohydraulic forming ehf was quantified using a unique experimental capability developed at pnnl. Electrohydraulic forming principles generally speaking, high pulse power hpp forming processes refer to the brief discharge of high voltage capacitors into either a coil for the mpf process or an arc. Electrohydraulic forming of sheet metal parts request pdf. Start this article has been rated as startclass on the projects quality scale. The deformation behavior and texture evolution during forming of an advanced highstrength steel dp600 grade were characterized. Tasks of a hydraulic installation hydraulic systems are used in modern production plants and manufacturing installations. Pdf development of electrohydraulic forming process for. An investigation of sheet metal deformation behavior during electrohydraulic forming ehf. A capacitor bank delivers a pulse of high current across two electrodes, which are positioned a short distance apart while submerged in a fluid. Highpower transmission capacity at lowenergy losses, low noise emissions, high reliability, and ease of maintenance, as well as convenient costeffectiveness, are required for industrial applications regarding variable electrohydraulic supply.
Electrohydraulic eh electromechanical ema electrohydrostatic eha. Electrohydraulic forming and electromagnetic forming topics covered 1 introduction 2 process principle 3 constructional details 4 advantages and disadvanta slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Minimal spring back of formed sheets because of the extremely fast forming. Electro hydraulic forming is based on rapid increase of pressure of water inside a chamber. Proceedings of the asme 20 international manufacturing science and engineering conference collocated with the 41st north american manufacturing research conference. 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.
High energy rate forming herf processes introduction. View pdf catalogues and other online documentation. Studies on water hammer forming on sheet metal works. Development of electrohydraulic forming process for aluminum sheet with sharp edge article pdf available in advances in materials science and engineering 201711. Kyntronics partners with oems in a range of industries to customize actuation systems that suit specific needs. Hydroforming techniques seminar report, ppt, pdf for. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks. Pdf electrohydraulic sheet metal forming with flexible tools. Development of electrohydraulic forming process for.
The hydraulic fluids represent the medium for power transmission. Electrohydraulic forming is a type of metal forming in which an electric arc discharge in liquid is used to convert electrical energy to mechanical energy and change the shape of the workpiece. One interesting solution to extend existing forming limits can be the use of electrohydraulic forming as single forming operation or in combination with quasi. This article is within the scope of wikiproject metalworking, a collaborative effort to improve the coverage of metalworking on wikipedia. Electrohydraulics backgrounder 205 page 2 selectingsizing electrohydraulic system components designers developing electrohydraulic systems for the first time will have to deal with some new design issues. An investigation of sheet metal deformation behavior. Power generation electrohydraulic control system improve. This multimaterial capability will allow vehicle manufacturers and their suppliers to make the necessary investments to bring ehf. Special forming process sheet metal explosive material. Pdf formability enhancement of dp600 steel sheets in.
Accordingly, this process can help engineers create products with sharper edges, allowing a products radius of curvature to be less than 2 mm radius of curvature. Electric discharge in the form of sparks, instead of explosives, can also be used to generate a shock wave in a fluid. A final positive note for these high peak power processes is in fact their low overall energy consumption. Ask us how our engineering team can partner with you to create complete electrohydraulic actuator eha or electromechanical actuator ema packages providing a differentiating solution, reducing your cost and accomplishing your business goals. The process is also called underwater spark or electricdischarge forming. The temperature of work is increases due to adiabatic heating. Electrohydraulic load sensing with a speedcontrolled. The overcoming of design constraints with respect to forming of sharply contoured sheet metal workpieces made of high strength steel or other materials which are difficult to form is an important aspect in sheet metal part production. Hydraulic press brake press mechanical press drop hammer gasactuated ram explosive forming magnetic forming electrohydraulic forming source. Improved lubrication if lubricating film is maintained. Division of installation into signal control section and hydraulic power section. This manufacturing process uses the energy from the combustion of a thin metal wire.
Electrohydraulic control system improve your steam turbine reliability power generation abbs hydraulic repair and reconditioning service specializes in bringing equipment back to its original performance, helping to prevent costly failures and improving plant safety. To hydroform aluminum into a vehicles frame rail, a hollow tube of aluminum is placed inside a negative mold that has the shape of the desired end result. Shaping metal by generating high speed shockwaves in water, ehf is clean, efficient and unbelievably fast. Electro hydraulic forming trails were performed with a chamber of water with a pair of electrodes on one side of the sheet. Electrohydraulic definition is of or relating to a combination of electric and hydraulic mechanisms. Electrohydraulic forming of advanced highstrength steels.
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