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US 4,015,459 AGranted
Hydrodynamic drawing of multiple gauge metal strip
AssigneeOlin Corporation
InventorsJoseph Winter, Eugene Shapiro, Warren F. Smith
Life of this patent
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AssigneeOlin Corporation
InventorsJoseph Winter, Eugene Shapiro, Warren F. Smith
Estimating the term…
Multiple gauge metal strip is prepared by a process which comprises shaping strip material of rectangular cross section to form regions of at least two variable thicknesses defining a stepped surface configuration in at least one of the broad surfaces of said strip, and drawing the shaped strip through a die which defines said cross sectional configuration to produce a reduction of said strip to final dimension, wherein said drawing step is performed without direct surface-to-surface contact between said strip and said die, such that the width dimension of said strip is unchanged and the ratio of strip surface to strip cross sectional area changes by at least 30%. The drawing method of this invention employs hydrodynamic lubrication and can achieve one-pass cross sectional reductions of from 39 to 55%.
A method for the preparation of multiple gauge metal strip of rectangular cross section possessing regions of at least two variable thicknesses defining a stepped surface configuration in at least one of the broad surfaces of said strip said method comprising, drawing a previously shaped strip through a die defining said rectangular cross section wherein direct surface-to-surface contact between said strip and said die is prevented, the width dimension of said strip is unchanged and the ratio of strip perimeter to strip cross sectional area changes by at least 30%.
A method for the preparation of multiple gauge metal strip which comprises shaping strip material of rectangular cross section to form regions of at least two variable thicknesses defining a stepped surface configuration in at least one of the broad surfaces of said strip material, and drawing the shaped strip material through a die employing hydrodynamically lubricated die which defines said stepped surface configuration to cause a reduction in the thickness of said strip to final dimension, wherein said drawing is performed without direct surface-to-surface contact between said strip and said die, the width dimension of said strip is unchanged and the ratio of strip perimeter to strip cross sectional area changes by at least 30%.
An apparatus for the preparation of multiple gauge metal strip of rectangular cross section possessing regions of at least two variable thicknesses defining a stepped surface configuration by hydrodynamic drawing which comprises:
Dependencies are inferred from the claim text.