One of the requirements for significant cost savings in the manufacture of
tinplate cans in the packaging industry, is to achieve a die formed diameter
reduction (or neck) on the can, inexpensively and reliably. A novel technique
for the formation of a neck on metal canisters, uses the ability of ultrasonic
vibration to reduce the apparent friction (and hence forming force) between the
die work surface and the material being formed. Ultrasonic forming, although
known to be a viable technique, has not been fully exploited due to a lack of
understanding of the process. This has resulted in a lack of tool design
knowledge and process reliability problems. The aim of the research reported
in this thesis, is to investigate the vibration characteristics of ultrasonically
excited forming tools with reference to the metal forming process and
particularly, from a tool design viewpoint. [Continues.]
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.
Science and Engineering Research Council. CMB Technology PLC.