A Study on Contour of Workpiece According to the Shape of Forming Coil in EMF Process
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Date
2012-07-17
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Abstract
Aluminium alloys is desirable for the automotive and electronic appliances industries due to
their high strength-to-weight ratio, corrosion resistance and weldability. However
applications of the aluminium alloys were very difficult because aluminium alloys formability
is very low at room temperature, despite their advantages. One of the high speed forming
technologies is Electromagnetic Metal Forming (EMF), which can be useful forming method
for low formability light-weight materials such as aluminium, magnesium alloys in overcoming
the limitations of conventional forming methods. EMF process refers to the high velocity and
high strain rate deformation of low-formability materials driven by electromagnetic forces that
are generated by the rapid discharge current through forming coil. This technology depends
on the properties of the sheet metal, as well as the process factors such as electromagnetic
force in a practical forming operation. Moreover selection of proper shape of forming coil is
most important to achieve the desired deformation using the EMF process. Therefore, the
purpose of this study is to analyse of the dynamic behaviours on workpiece according to
various forming coil shape with aluminium alloys. To achieve these objectives, a magnetic
pulse forming system consisting of a 24kJ electromagnetic power source and a bar-type and
helical-type forming coil was employed in an experiment. Then, deformation depth was
measured for analyse dynamic behaviours on workpiece. The results showed that as the
electromagnetic force increases, surface damage to part of the workpiece will increase and
according to the shape of forming coil, distribution of electromagnetic force applied on
workpiece is changed in EMF process.
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Keywords
aluminium alloys, electromagnetic force, electromagnetic metal forming (EMF), forming