Maintaining a preferred vibration mode in an annular article
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United States of America Patent
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-
Mar 17, 1992
Grant Date -
N/A
app pub date -
Mar 28, 1990
filing date -
Mar 28, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A forming die of a kind having a top surface (38) a bottom surface, a peripheral side surface (39) connecting the bottom surface to the top surface (38) and including a receptor area (36) for receiving vibratory force, and an annular work surface (32) defining an aperture extending from said top surface through to said bottom surface has a plurality of localised mass concentrations 43,44,45, arranged symmetrically about an axial plane normal to the plane of the receptor area. The shape of the die is designed to modify resonant frequencies corresponding to unwanted modes of vibration to increase the separation between the frequencies of the unwanted modes and a chosen R0 mode of vibration. The die may be adapted for use in the operations of reducing the diameter of a tubular article; deep drawing or like processes.
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