Investigation of Tailored Pressure Distributions by Vaporizing Tailored Foils
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Date
2014
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Abstract
The rapid vaporization of thin metallic conductors can be used for innovative high speed
forming processes. Metal wires or foils are vaporized when a high current is applied. The
generated metal gas or plasma expands very rapidly with high pressure and impacts on
an intermediate polyurethane plate near the wires or foils. A shock wave is induced into
the polyurethane plate and provides the pressure pulse to the sheet metal, leading to a
deformation of the sheet. This process requires no expensive tool coils and no electrical
conductivity of the workpiece, which makes it attractive to multiple fields of application
such as forming and impact welding. In this study, the basic process parameters that
influence the shock pressure were experimentally identified including the charging energy
of capacitor bank, foil geometry (thickness and width) and thickness of polyurethane plate.
Based on the experiments of the parameter investigations, different new foil designs were
investigated in order to acquire a tailored pressure distribution. The results show that the
shock pressures can be located at different positions in a discontinuous way. Besides, the
pressure amplitudes and areas at different positions can also be varied, which depends
on the vaporized foil geometries at those positions.
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Keywords
Impact forming, Sheet metal forming, Vaporizing foil actuator forming