Electrohydraulic full-forward extrusion of small parts through high aspect ratio forming channels
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Date
2021-10-13
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Abstract
Electrohydraulic incremental bulk forming was introduced as a novel micro part forming
technology. Forming of parts from different materials and different initial diameter values was
investigated in single-stage full-forward extrusion in recent work. In this paper, multi-stage
extrusion in high aspect ratio forming channels is presented. Thereby, the aspect ratio of
forming channel is high, when the channel length is much higher than the channel diameter
and formed part length. Analytical and experimental investigations are carried out to correlate
the supplied and required energy for extrusion. Experiments were made using an optical access
made of sapphire as part of the extrusion channel to measure the position during forming
increments. The influence of channel depth and curvature as well as of fluctuations in the
transmitting media on the energy transmission to the formed EN AW-6061 aluminum alloy parts
were found to be low.
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Keywords
micro production, optical process monitoring, impulse bulk forming