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1. (WO2017032958) ULTRASONICALLY VIBRATED DIE RINGS

Pub. No.:    WO/2017/032958    International Application No.:    PCT/GB2015/052483
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Fri Aug 28 01:59:59 CEST 2015
IPC: B21D 51/26
B06B 3/00
B21C 1/00
B21D 22/20
Applicants: MAGNAPARVA PACKAGING LIMITED
Inventors: ASHCROFT, Miles
Title: ULTRASONICALLY VIBRATED DIE RINGS
Abstract:
An ultrasonically vibrated die ring (2) for forming tubular metal workpieces comprises a flat interface (14) for connecting an ultrasonic transducer (22) to the die ring (2). A first rib (20) projects outwards along part of a circumference of the die ring (2) on one side of the interface (14). A similar second rib (18) may be disposed along a circumference on the other side of the interface (14). The first rib (20) and the optional second rib (18) at the circumferential position of the transducer interface (14) help to keep the interface (14) flat and maintain a good connection with the transducer (22) as the die ring (2) vibrates in a radial bending resonant mode.