Experimental analysis of an electromagnetic pulse forming systems pre-heated by induction

Abstract

 Design and implementation of electromagnetic forming system  Induction heating system design  Experimental results of electromagnetic pulse forming systems preheated by induction High speed forming is a trending technique in sheet metal forming processes. Electromagnetic forming is one of the methods in high speed forming which is mostly employed in forming of sheet metal and pipes. For brittle materials, to increase formability, heating is employed, which would slow down the forming process if performed externally. Induction heating provides a proper option where the heating and forming processes can be sequentially applied. Induction heating is currently employed in many heating processes, both for industrial and domestic use. Its advantages such as efficiency, fast heating, safety, cleanness and accurate control makes it appropriate for such purposes. In this study, an electromagnetic forming system combined with induction heating is designed and constructed. This way, a controlled heating can be performed which is followed by the electromagnetic forming process. Figure A. Induction heating system circuit diagram and forming system circuit design Purpose: To combine the heating and forming process in an induction heating/electromagnetic forming system to improve the formability of brittle materials. Theory and Methods: Induction heating and electromagnetic forming methods are employed within the study. The material is first heated and then formed with the coil-die set system. Results: The combined induction heating/electromagnetic forming system is utilized to bulge Al7075 sheets of 0.75 mm thickness. It has been seen that the forming can be done effectively. The material that is used in the tests (Al7075) does not have an improved formability in the temperature regions tested; therefore, the system, although worked with good precision, did not lead to better forming results for the tested material. Conclusion: The combined induction heating and electromagnetic forming system that utilizes the coil-die set system is successfully operated and tested. The system is shown to perform well in forming of Al7075 sheet samples.

Simulation and Implementation of an Induction Heating System for Heating Brittle Thin Metal Sheets by Various Excitation Current Frequencies

“…In [5] the authors established a technological solution for a system of local associated induction heating of a lengthy pipeline utilizing functional methodologies and presented an induction heating system for an extended pipeline which incorporates the technique of local-associated heating. Brittle materials including aluminum, magnesium, titanium, and nickel alloys are manufactured using an electromagnetic forming and induction heating system that has been established in [6]. These elements find increased usage in the transportation, aerospace, and defense industry.…”