Abstract
Ultrasonic orbital microforming—UOM—uses the broadly understood idea of orbital forging but uses very different laws of physics. The only shaping force in this process is the inertia force resulting from the acceleration in the rotary motion of the workpiece. Micro specimen blanked from cold rolled aluminum sheet metal was used in the applied UOM process. Only the upper and lower part of the sample is deformed that gives about 70% of volume. The rest—the middle part—remains undeformed. The final shape of the product is influenced by the shape of the inside of the die in which the UMO process is carried out. However, this effect is not a direct one. The product shape does not repeat the shape of the interior of the die. The preliminary experiments with modular micro-die have been performed on the way of controlling the shape of deformed micro-objects. The microstructure analysis has been done as well as micro-hardness distribution.
Highlights
The progressive development of miniature systems is the driving force and challenge for miniaturization of all material technologies
[38] ultrasonic orbital microforming (UOM) consists in inducing the rotational rotational motion of the cylindrical workpiece with a flat punch vibrating with an ultrasonic frequency
Motion of the cylindrical workpiece with a flat punch vibrating with an ultrasonic frequency
Summary
The progressive development of miniature systems is the driving force and challenge for miniaturization of all material technologies. Ultrasonic-vibration reduce forces in the ECAP [33] and micro-extrusion processes by strong reduction of friction [34] and reduce the flow stress [35] by temperature increase, and the softening effect. In studies on the influence of ultrasonic vibrations on the course of microforming process, often used is micro-upsetting under dry friction conditions [38,39] due to geometric simplicity and relative ease for modelling. The end of the punch turns into small circles, which allows the shaped punch small circles, allows the shaped sample tobegins be introduced into a rotary motion. Is manufacturing short objects with variable diameter It is implemented in a micro-scale and hasItthe implemented in a micro-scale and has potential for further to new an unpredictable potential for further miniaturization tothe an unpredictable degree.miniaturization.
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