Patent US4015459A successfully refreshed from Google Patents.
US4015459A
Expired / Lapsed
US
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Hydrodynamic drawing of multiple gauge metal strip
Assignee: Olin Corp
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Filing: 1975-12-31
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Granted: 1977-04-05
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Expires: 1995-12-31
Abstract
Abstract 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%.
Inventors
- 👤 Joseph Winter
- 👤 Eugene Shapiro
- 👤 Warren F. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:54
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/02; B21C3/00; B21C3/02; B21C3/04; B21C3/10; B21C3/12; B21C3/14
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
90 words
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%.
Claim 2
Independent Claim
90 words
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%.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said previously shaped strip possesses a multiple gauge configuration corresponding to the configuration of said die.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein said strip undergoes reduction taken on the broad surfaces thereof.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein said change of the ratio of strip surface to strip cross sectional area comprises an increase.
Claim 6
Dependent Claim
17 words
The method of claim 4 wherein said ratio changes by an amount ranging from 30 to 50%.
Claim 7
Dependent Claim
23 words
The method of claim 1 wherein said drawing employs hydrydynamic lubrication and achieves one pass cross sectional reductions ranging from 39 to 55%.
Claim 8
Dependent Claim
15 words
The method of claim 1 wherein said strip is previously shaped by a milling operation.
Claim 9
Dependent Claim
15 words
The method of claim 1 wherein said strip is previously shaped by a shaving operation.
Claim 10
Dependent Claim
26 words
The method of claim 1 wherein said multiple gauge configuration comprises three truncated pyramidal protrusions in the central region of one broad surface of said strip.
Claim 11
Dependent Claim
26 words
The method of claim 1 wherein said multiple gauge configuration comprises four rectangular grooves located in the central region of one broad surface of said strip.
Claim 12
Dependent Claim
37 words
The method of claim 1 wherein said multiple gauge configuration comprises a stepped reduction in gauge defining two levels of the broad surfaces of said strip, said reduction occurring at parallel points on each of said surfaces.
Claim 13
Dependent Claim
34 words
The method of claim 1 wherein said multiple gauge configuration comprises non-symmetrical center channel disposed on one broad surface of said strip, said channel defining, respectively, 90° and 45° angles on opposite sides thereof.
Claim 14
Independent Claim
116 words
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%.
Claim 15
Independent Claim
116 words
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%.
Claim 16
Dependent Claim
15 words
The method of claim 13 wherein said strip material is shaped by a shaving operation.
Claim 17
Dependent Claim
12 words
The method of claim 13 wherein said ratio change comprises an increase.
Claim 18
Dependent Claim
16 words
The method of claim 13 wherein one pass cross sectional reductions of from 39 to 55%.
Claim 19
Independent Claim
139 words
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: A. a container which houses a quantity of lubricant material and possesses an opening in its side walls for the passage therethrough of metal strip; and B. a die assembly mounted adjacent said container in communication with one of said openings which defines a multiple gauge cross sectional configuration and which comprises a hydrodynamic section and a reduction section connected thereto, wherein said reduction section is of such configuration that strip reduction is confined to the broad surfaces of said strip, and equal percentage reductions of said strip occur uniformly with respect to said variable thicknesses at any point lying within any given transverse plane taken therethrough.
Claim 20
Independent Claim
139 words
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: A. a container which houses a quantity of lubricant material and possesses an opening in its side walls for the passage therethrough of metal strip; and B. a die assembly mounted adjacent said container in communication with one of said openings which defines a multiple gauge cross sectional configuration and which comprises a hydrodynamic section and a reduction section connected thereto, wherein said reduction section is of such configuration that strip reduction is confined to the broad surfaces of said strip, and equal percentage reductions of said strip occur uniformly with respect to said variable thicknesses at any point lying within any given transverse plane taken therethrough.
Claim 21
Dependent Claim
41 words
The apparatus of claim 17 wherein each section of said die assembly is comprised of a primary shape-defining element, a secondary shape-defining element and means for adjusting the height and width dimensions of the cross sectional area defined by said elements.
Claim 22
Dependent Claim
27 words
The apparatus of claim 18 wherein said adjusting means comprises paired spacers of varying thickness which are located between said shape-defining elements to adjust said height dimension.
Claim 23
Dependent Claim
33 words
The apparatus of claim 19 wherein said adjusting means further comprises paired shims of varying thickness which are laterally located between said spacers and said primary shape-defining elements to adjust said width dimension.
Claim 24
Dependent Claim
31 words
The apparatus of claim 17 wherein said hydrodynamic section comprises an adjustable inlet nozzle defining a cross sectional area of sufficient size to enable the passage therethrough of lubricant-coated metal strip.
Claim 25
Dependent Claim
21 words
The apparatus of claim 17 wherein the reduction section comprises an adjustable drawing die defining said multiple gauge cross sectional configuration.
Claim 26
Dependent Claim
18 words
The apparatus of claim 17 wherein the connection between said hydrodynamic section and said reduction section is detachable.
Claim 27
Dependent Claim
29 words
The apparatus of claim 23 wherein said detachable connection is rendered leak-proof by the provision of a seal member between the mating surface of said die and said nozzle.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |