Maintaining a preferred vibration mode in an annular article

Details Maintaining a preferred vibration mode in an annular article Maintaining a preferred vibration mode in an annular article

1991-10-23

1992-11-24

Crane, Daniel C.

Metal tools and implements, making

Blank or process

Die

B21K 500, B21D 3720

Patent

active

051653095

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 localized 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 RO 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.

REFERENCES:
patent: 3243989 (1966-04-01), Meats
patent: 3910085 (1975-10-01), Biddell
patent: 3945231 (1976-03-01), Imazu et al.
patent: 4567793 (1986-02-01), Millner

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