Highaltitude nuclear detonations and electromagnetic bombs can generate emp that. Jul 15, 2014 magnetic pulse welding mpw is a solidstate impact welding technology that provides metallurgical joints while exhibiting a negligible heataffected zone. To achieve the above objectives, an intelligent system which consisted of. A magnetic pulse welding mpw or forming mpf device is provided having a split coil design, thereby facilitating the opening and closing thereof. The goal of this study was to investigate the main design parameter in mpf. An emp or e lectro m agnetic p ulse is a wave of electromagnetic radiation. One such application is that of a magnetic switch being used to discharge a pulse forming line pfl into a load. The invention relates to a device 100 for shaping workpieces, in particular for shaping body sheetmetal parts. This ability to easily load and unload parts is considered critical to the successful application of mpw technology to mass production environments. Magnetic field is used to generate impact magnetic pressure for welding and forming the work piece by converted the electrical energy to mechanical energy. Pulse forming network equations and calculator ness.
Pdf springback reduction of lshaped part using magnetic. The design of processes like magnetic pulse forming and electrohydraulic forming involves multiphysical couplings that require numerical simulation, and knowledge on dynamic behaviour of metals. The welding or forming methods can include the use of split coils or split inductors that allow for ease of access to the joints to be. Optimized design to improve the function of a magnetic. The induced electromotive force gives rise to a current whose magnetic field opposes the original change in magnetic flux. A method of manufacturing an automotive innerskeletal structure or spaceframe having closed members and nodes defining joints of said spaceframe, said method of manufacturing using electromagnetic pulse forming emf or magnetic pulse welding mpw, and comprising the steps of. The magnetic pulse mp and the extreme deformation speed transforms the metal into a viscoplastic state increasing formability without affecting the native strength of the material. The circuit schematic for the type b pulse forming network is shown below. Magnetic pulse welding mpw is a solidstate impact welding technology that provides metallurgical joints while exhibiting a negligible heataffected zone. Us20050205553a1 coil design for magnetic pulse welding. Magnetic pulse welding on the cutting edge of industrial. Inverse bending and springbackcontrol using magnetic.
Magnetic pulse welding and forming for plates dana. Apr 20, 2016 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. In very large events an emp can cause electronic systems failures. Emp can also be produced from nonnuclear sources, such as electromagnetic bombs, or ebombs. Electromagnetic sheet forming by uniform pressure using flat. Pulse crimping mpw mpc l doors and closures in car body engineering 2014, 5th international benchmarking conference. In order to evaluate the effect of impact induced by driver sheet, the. A switch is closed at approximately time 0 and the. Effects of driver sheet on magnetic pulse forming of az31. The workpiece is reshaped by high intensity pulsed magnetic fields that induce a current in the workpiece and a corresponding repulsive magnetic field, rapidly repelling.
Magnetic pulse forming is a method to shape a workpiece at high speed using pulsed magnetic forces psyk et al. However, magnetic switches are sometimes cast in roles which depart from their traditional use in a melville line network. Wo2017186422a1 device and method for shaping workpieces by. Sep 20, 2019 electromagnetic forming em forming or magneforming is a type of high velocity, cold forming process for electrically conductive metals, most commonly copper and aluminium. Optimized design to improve the function of a magnetic pulse. Being a highstrain rate forming method, the emf process has all the. Generally a mpfmagnetic pulse forming process refers to the high velocity and high strain rate deformation of a lowductility materials driven by electromagnetic forces that are generated by the rapid discharge current through the forming coil.
Magnetic pulse and electrohydraulic processes for forming. Determination of high strainrate behavior of metals. In this work, the formability of az31 magnesium alloy sheets was investigated by electromagnetic bulging experiments with driver sheet. An emp does not directly hurt people, but an emp interacts with power lines, metal, conductive materials and electronics and causes power spikes. During the current pulse, the coil is surrounded by a strong transient magnetic field. In this type b pfn, each capacitance has an initial condition voltage of v. Electromagnetic forming emf is a noncontact forming technique. Direct electromagnetic forming forming by high speed punch using an agent elastic material. Several steps of quasistatic stamping and magneticpulse forming with radial force improve the forming depth by 31% compared to quasistatic stamping. Oct 09, 2012 the present invention relates to magnetic pulse welding and forming and more specifically to using magnetic pulse welding to couple plates, such as battery plates, or using magnetic pulse forming to form plates. Electromagnetic forming last updated september 20, 2019 a pinched aluminium can, produced from a pulsed magnetic field created by rapidly discharging 2 kilojoules from a high voltage capacitor bank into a 3turn coil of heavy gauge wire electromagnetic forming em forming or magneforming is a type of high velocity, cold forming process for electrically conductive metals, most. Industrialisation of electromagnetic pulse technology. The deformation speed of this method can be as high as 300 ms. Industrialisation of electromagnetic pulse technology empt.
Such a pulse s origin may be a natural occurrence or manmade and can occur as a radiated, electric, or magnetic field or a conducted electric current, depending on the source. Magnetic pulse welding and forming for plates justia. The generator is based on a magnetic pulse compression circuit, its repetition rate is one pulse per some minutes. A large one could knock out power or kill electronic. For our example simulation, we have selected a pulse width t of 10 m s and a load impedance z of 100 ohm. It is an impulse or highvelocity forming method using pulsed magnetic field by application of lorentz forces to the work piece preferably made of highly electrically conductive material without having working medium and mechanical contact. Simulation and experiments for highspeed forming processes. Since the input of thermal energy is significantly reduced compared to conventional fusion welding technologies, critical intermetallic phases can largely be avoided.
Electro magnetic pulse forming electromagnetic em forming is a technique for forming of metals by means of plastic deformation generated by a repulsive force on account of the interaction between the magnetic field of the coil and the current induced in the workpiece. Us patent for magnetic pulse welding and forming for plates. Bmax is a leading provider of advanced metal processing solutions. Us6389697b1 fabricating automotive spaceframes using. Pulse forming line pfl pulse forming network pfn discrete element approximation of pfl, used for longer pulse duration. Magnetic pulse forming of thinaluminum sheet using bar. Electromagnetic forming em forming or magneforming is a type of high velocity, cold forming process for electrically conductive metals, most commonly copper and aluminium. The transient nature of the magnetic field induces current in a nearby conductive workpiece that flows opposite to the current in the coil. In magnetic pulse forming and welding processes, there involves no charge accumulation and eddy current approximation follow a divergence free current density, those implies. Electromagnetic response workshop 3 magnetostatic analysis of a solenoid valve workshop 4 magnetic pulse forming of a metallic tube.
Magnetic pulse welding technology citeseerx mafiadoc. Therefore, proper collision conditions are necessary. Mps electromagnetic magnetic pulse forming and welding. Magnetic pulse technology is used for joining dissimilar metals, and for forming and cutting metals. The spaceframe can be either an all aluminum structure or a combination of dissimilar materials, such as aluminum and steel. Interface phenomena and bonding mechanism in magnetic pulse. Sharma, department of mechanical engineering, iit roorkee. The present invention relates to magnetic pulse welding and forming and more specifically to using magnetic pulse welding to couple plates, such as battery plates, or using magnetic pulse forming to form plates.
Examples of mpw applications a audi space frame structure 64. Magnetic pulse forming is a solution for forming and perforating processes reduce cost significantly. An electromagnetic pulse emp, also sometimes called a transient electromagnetic disturbance, is a short burst of electromagnetic energy. Magnetic pulse forming mpf is a plastic deformation method that uses a high intensity magnetic field. Magnetic pulse forming is a technology that has gained interest in the last decades thanks to the increased formability it offers for highresistancelow weight ratio materials such as. Pulse forming network investigation by edward guy cook, b. The generator consists of a thyratron switch, a resonant transformer 1. Structure and operating principle of a magnetic pulse forming device the magnetic pulse forming equipment consists of forming and circuit parts, as shown in fig. There are a variety of methods for connecting plates together, such as plates for a battery. In this study, we maximized the mpf depth of a molded product using the results of an optimization study.
Electromagnetic forming wikimili, the free encyclopedia. Magnetic pulse forming is a technology that has gained interest in the last decades. Magnetic pulse compression magnetic modulator branched magnetics. Iii electromagnetic forming the electrical energy stored in a capacitor bank is used to produce opposing magnetic fields around a tubular work piece, surrounded by current carrying coils. The transient nature of the magnetic field induces current in a nearby conductive workpiece that. Effect of the wall thickness on the forming behavior and. Interface phenomena and bonding mechanism in magnetic. Electromagnetic em forming is a technique for forming of metals by means of plastic deformation generated by a repulsive force on account of the interaction between the magnetic field of the coil and the current induced in the workpiece. Electromagnetic sheet forming by uniform pressure using. The emf process uses a capacitor bank, a forming coil, a field shaper, and an electrically conductive workpiece to create intense magnetic fields that are used to do the useful work. The magnetic pressures for forming of metallic materials are in the range of 100nmm to generate these pressures, it is necessary to. Inverse bending and springbackcontrol using magnetic pulse.
Several steps of quasistatic stamping and magnetic pulse forming with radial force improve the forming depth by 31% compared to quasistatic stamping. 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. Electromagnetic forming emf is a highspeed forming technology that can be applied for shaping as well as for joining and cutting of sheet metal and profileshaped workpieces made of an electrically conductive. Schematic diagram of the lshaped part bending and magnetic pulse springback calibration using a the initial state of forming method 1, b the initial state of forming method 2, c the quasi. Magnetic pulse welding is a promising technology for the joining of dissimilar metals. The workpiece is reshaped by high intensity pulsed magnetic fields that induce a current in the workpiece and a corresponding repulsive magnetic field, rapidly repelling portions of the workpiece. About bmax bmax is a leading provider of advanced metal processing solutions.
The mpw process is a high speed single shot welding technique used mainly for joining tubular components in a lap configuration and characteristic length scales of few millimeters to centimeters. Fabricating automotive spaceframes using electromagnetic. As such, partworkpieces can be readily loaded and unloaded with respect thereto. A new forming method denoted as incremental electromagneticassisted stamping iemas with radial magnetic pressure is proposed in this paper, which was adopted for the deep drawing of a. The device 100 has a first magnetic forming apparatus 1, which comprises at least one first forming tool 10 and at least one first magnetic tool 11, and a second magnetic forming apparatus 2, which comprises at least one second forming tool 20 and at least one second. Magnetic pulse forming mpf gives you the power to create complex and detailed shapes more efficiently and with less steps and equipment. Jun 14, 2015 magnetic pulse forming and welding by mps5. Generally a mpf magnetic pulse forming process refers to the high velocity and high strain rate deformation of a lowductility materials driven by electromagnetic forces that are generated by the rapid discharge current through the forming coil. This intensive high current discharged through a coil surrounding. A method for fabricating an automotive spaceframe using electromagnetic pulse forming emf or magnetic pulse welding mpw techniques.