Not a physicist, haven't done ultrasonic drawing but have experimentally designed and tested ultrasonic polymer welding systems from scratch. Ultrasonic energy

Not a physicist, haven't done ultrasonic drawing but have experimentally designed and tested ultrasonic polymer welding systems from scratch. Ultrasonic energy transfer is impressive but it has a lot of downsides: including but not limited to high sensitivity to target geometry, input vector, pressure, and feed rate. I guess in a deep draw application near-uniform pressure distribution and feed rate are both guaranteed but the input vector may be very expensive to iterate. I guess maybe these wins are documented on thin materials with custom tooling for ultrasonic input and the additional cost of tool design and energy input is not computed. Perhaps a subset of this technique may become popular, for instance application to outermost draw profile edges where perhaps tears are more common and access remains easier, which might enable more generic and portable (nominally draw punch and die independent) ultrasonic input.