Effect of the wall thickness on the forming behavior and. Emp can also be produced from nonnuclear sources, such as electromagnetic bombs, or ebombs. Interface phenomena and bonding mechanism in magnetic pulse. 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. This ability to easily load and unload parts is considered critical to the successful application of mpw technology to mass production environments. One such application is that of a magnetic switch being used to discharge a pulse forming line pfl into a load. Determination of high strainrate behavior of metals. Examples of mpw applications a audi space frame structure 64. A switch is closed at approximately time 0 and the. In this range, the mechanical behaviour can be significantly. Pulse forming line pfl pulse forming network pfn discrete element approximation of pfl, used for longer pulse duration. In this work, the formability of az31 magnesium alloy sheets was investigated by electromagnetic bulging experiments with driver sheet. Magnetic pulse compression magnetic modulator branched magnetics. 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.
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. Wo2017186422a1 device and method for shaping workpieces by. 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. 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.
An electromagnetic pulse emp, also sometimes called a transient electromagnetic disturbance, is a short burst of electromagnetic energy. 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. Magnetic pulse forming of thinaluminum sheet using bar. Pulse forming network equations and calculator ness. However, magnetic switches are sometimes cast in roles which depart from their traditional use in a melville line network. 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 welding and forming for plates justia. In this study, we maximized the mpf depth of a molded product using the results of an optimization study. 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.
Inverse bending and springbackcontrol using magnetic pulse. An emp does not directly hurt people, but an emp interacts with power lines, metal, conductive materials and electronics and causes power spikes. Interface phenomena and bonding mechanism in magnetic. Compared to the traditional forming process, this method is simple, and produces better surface quality of the molded product after processing. The goal of this study was to investigate the main design parameter in mpf.
Us patent for magnetic pulse welding and forming for plates. The generator is based on a magnetic pulse compression circuit, its repetition rate is one pulse per some minutes. Sharma, department of mechanical engineering, iit roorkee. Many studies indicate that magnetic pulse forming can improve the forming performance for aluminum alloy and reduce its springback. Effects of driver sheet on magnetic pulse forming of az31. In order to evaluate the effect of impact induced by driver sheet, the.
To achieve the above objectives, an intelligent system which consisted of. Electromagnetic response workshop 3 magnetostatic analysis of a solenoid valve workshop 4 magnetic pulse forming of a metallic tube. 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. Magnetic pulse forming is a method to shape a workpiece at high speed using pulsed magnetic forces psyk et al. Several steps of quasistatic stamping and magneticpulse forming with radial force improve the forming depth by 31% compared to quasistatic stamping. 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. Us6389697b1 fabricating automotive spaceframes using. Electromagnetic forming wikimili, the free encyclopedia. The invention relates to a device 100 for shaping workpieces, in particular for shaping body sheetmetal parts.
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. Magnetic pulse welding technology citeseerx mafiadoc. 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. Pdf springback reduction of lshaped part using magnetic. The induced electromotive force gives rise to a current whose magnetic field opposes the original change in magnetic flux. Electromagnetic forming emf is a noncontact forming technique. In magnetic pulse forming and welding processes, there involves no charge accumulation and eddy current approximation follow a divergence free current density, those implies. As such, partworkpieces can be readily loaded and unloaded with respect thereto. An emp or e lectro m agnetic p ulse is a wave of electromagnetic radiation. The transient nature of the magnetic field induces current in a nearby conductive workpiece that.
In very large events an emp can cause electronic systems failures. Magnetic pulse forming is a solution for forming and perforating processes reduce cost significantly. Since the input of thermal energy is significantly reduced compared to conventional fusion welding technologies, critical intermetallic phases can largely be avoided. Magnetic pulse welding and forming for plates dana. Magnetic pulse technology is used for joining dissimilar metals, and for forming and cutting metals. 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. 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.
A magnetic pulse welding mpw or forming mpf device is provided having a split coil design, thereby facilitating the opening and closing thereof. Jun 14, 2015 magnetic pulse forming and welding by mps5. Direct electromagnetic forming forming by high speed punch using an agent elastic material. Magnetic pulse and electrohydraulic processes for forming. Electromagnetic sheet forming by uniform pressure using flat.
About bmax bmax is a leading provider of advanced metal processing solutions. 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. Bmax is a leading provider of advanced metal processing solutions. 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.
Optimized design to improve the function of a magnetic. Inverse bending and springbackcontrol using magnetic. Being a highstrain rate forming method, the emf process has all the. The spaceframe can be either an all aluminum structure or a combination of dissimilar materials, such as aluminum and steel. Jul 15, 2014 magnetic pulse welding mpw is a solidstate impact welding technology that provides metallurgical joints while exhibiting a negligible heataffected zone. Pulse forming network investigation by edward guy cook, b. There are a variety of methods for connecting plates together, such as plates for a battery. Fabricating automotive spaceframes using electromagnetic. The transient nature of the magnetic field induces current in a nearby conductive workpiece that flows opposite to the current in the coil. Integrated empt bluewave system ps1610 with 16kj energy at 10kv voltage. Such a pulses 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 emp interference is generally disruptive or damaging to electronic equipment. Magnetic pulse forming mpf gives you the power to create complex and detailed shapes more efficiently and with less steps and equipment.
Therefore, proper collision conditions are necessary. Industrialisation of electromagnetic pulse technology. Pulse crimping mpw mpc l doors and closures in car body engineering 2014, 5th international benchmarking conference. 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.
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. 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. Magnetic field is used to generate impact magnetic pressure for welding and forming the work piece by converted the electrical energy to mechanical energy. Magnetic pulse welding is a promising technology for the joining of dissimilar metals. Magnetic pulse forming mpf is a plastic deformation method that uses a high intensity magnetic field. The deformation speed of this method can be as high as 300 ms. Electromagnetic sheet forming by uniform pressure using. Magnetic pulse welding on the cutting edge of industrial.
A large one could knock out power or kill electronic. 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 circuit schematic for the type b pulse forming network is shown below. 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. Optimized design to improve the function of a magnetic pulse. 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. 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. A method for fabricating an automotive spaceframe using electromagnetic pulse forming emf or magnetic pulse welding mpw techniques. The generator consists of a thyratron switch, a resonant transformer 1. Magnetic pulse welding on the cutting edge of industrial applications fig. The magnetic pressures for forming of metallic materials are in the range of 100nmm to generate these pressures, it is necessary to. Several steps of quasistatic stamping and magnetic pulse forming with radial force improve the forming depth by 31% compared to quasistatic stamping. Electromagnetic pulse forming of carbon steel sheet metal. The science a special coil is placed near the metallic workpiece, replacing the pusher in traditional forming.
Simulation and experiments for highspeed forming processes. Magnetic pulse forming is a technology that has gained interest in the last decades. In this type b pfn, each capacitance has an initial condition voltage of v. 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. During the current pulse, the coil is surrounded by a strong transient magnetic field. Mps electromagnetic magnetic pulse forming and welding. This intensive high current discharged through a coil surrounding. The effect of this secondary current moving in the primary magnetic field is the generation of a lorentz force, which accelerates the flyer at a very high speed. Industrialisation of electromagnetic pulse technology empt. 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.
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