Metal deforming – By use of roller or roller-like tool-element
Reexamination Certificate
1998-05-26
2001-03-20
Butler, Rodney A. (Department: 3725)
Metal deforming
By use of roller or roller-like tool-element
C428S551000, C428S625000, C428S336000, C156S229000, C072S200000
Reexamination Certificate
active
06202462
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to noise-damping composites of the type which include outer metal layers and an intermediate viscoelastic layer for sound and vibration damping characteristics. In particular, the invention relates to a method of forming such composites.
2. Description of the Prior Art
Composites with a viscoelastic layer between two metal layers have been used to attenuate noise and vibration in a number of different environments where noise is a problem, especially to diminish the propagation of structural noise and the transmission of air-borne noise. In certain applications, such as in the head arms of computer disk drives, it is desirable that the viscoelastic layer be very thin. However, the viscoelastic material not only produces sound dampening, but is also the adhesive which holds the two outer metal skins together. It is extremely difficult to apply very thin viscoelastic layers, having a thickness of a fraction of a mil., in a continuous manner.
SUMMARY OF THE INVENTION
It is a general object of the invention to provide an improved method of making noise-damping composites which avoid the disadvantages of prior techniques while affording additional operating advantages.
An important feature of the invention is the provision of a method of making a noise-damping composite which has an ultrathin layer of viscoelastic damping material, while maintaining the noise-damping and adhesive characteristics of the viscoelastic material.
This and other features of the invention may be attained by providing a method of forming a noise-damping composite comprising the steps of: providing a laminate including two metal layers separated by a viscoelastic layer with each layer having an initial thickness, and subjecting the laminate to compressive forces sufficient to permanently substantially reduce the initial thickness of each layer of the laminate.
The invention consists of certain novel features and a combination of parts hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the details may be made without departing from the spirit, or sacrificing any of the advantages of the present invention.
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Hansen Richard M.
Vydra Edward J.
Butler Rodney A.
Material Sciences Corporation
Seyfarth, Shaw, Fairweather & Geraldson
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