Patent US3592030A successfully refreshed from Google Patents.
US3592030A
Expired / Lapsed
US
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Rolling mill stand screwdown position control
Assignee: Westinghouse Electric Corp
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Filing: 1969-06-05
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Granted: 1971-07-13
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Expires: 1989-06-05
Abstract
Abstract There is disclosed a method and apparatus to determine the proper unloaded screwdown setting for at least one stand of a rolling mill prior to a work strip entering that mill stand and in relation to the predicted flattening of the work rolls that will occur, when the required total roll-separating force is applied to that mill stand to obtain the desired delivery thickness of the work strip passing through that mill stand.
Inventors
- 👤 Andrew W Smith Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:42
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/16; B21B37/58; B21B37/60
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
199 words
In apparatus for determining the unloaded work roll position setting of at least one rolling mill stand in relation to A known stand roll force to effect a desired delivery thickness of a work strip from said mill stand, the combination of first means for estimating the roll flattening of at least one work roll in relation to said roll force applied to the stand, second means for determining if the work rolls will touch together beyond the width of the work strip in relation to the application of said known stand roll force, and third means for calculating the stand screwdown setting to provide a desired delivery work strip thickness from the mill stand in accordance with a first operation relative to said stand roll force and said work roll flattening if the work rolls are not touching together upon the application of said known stand roll force and in accordance with a second operation relative to said stand roll force and said work roll flattening in conjunction with an additional stand roll force in relation to said work roll touching condition if the work rolls are touching together upon the application of said known stand roll force.
Claim 2
Dependent Claim
199 words
In apparatus for determining the unloaded work roll position setting of at least one rolling mill stand in relation to A known stand roll force to effect a desired delivery thickness of a work strip from said mill stand, the combination of first means for estimating the roll flattening of at least one work roll in relation to said roll force applied to the stand, second means for determining if the work rolls will touch together beyond the width of the work strip in relation to the application of said known stand roll force, and third means for calculating the stand screwdown setting to provide a desired delivery work strip thickness from the mill stand in accordance with a first operation relative to said stand roll force and said work roll flattening if the work rolls are not touching together upon the application of said known stand roll force and in accordance with a second operation relative to said stand roll force and said work roll flattening in conjunction with an additional stand roll force in relation to said work roll touching condition if the work rolls are touching together upon the application of said known stand roll force.
Claim 3
Dependent Claim
121 words
In the method of controlling the screwdown position of a rolling mill stand having a pair of work rolls and in relation to a predetermined rolling operation to effect a desired delivery thickness of a work strip leaving said stand, the steps of calculating the first roll flattening condition of at least one of said work rolls in relation to a predetermined first roll force component, determining if said work rolls are touching beyond the width of said work strip, predicting a second roll force component in relation to a second roll-flattening condition when said work rolls are touching, and calculating the screwdown position of said mill stand in accordance with the sum of said first and second roll force components.
Claim 4
Dependent Claim
121 words
In the method of controlling the screwdown position of a rolling mill stand having a pair of work rolls and in relation to a predetermined rolling operation to effect a desired delivery thickness of a work strip leaving said stand, the steps of calculating the first roll flattening condition of at least one of said work rolls in relation to a predetermined first roll force component, determining if said work rolls are touching beyond the width of said work strip, predicting a second roll force component in relation to a second roll-flattening condition when said work rolls are touching, and calculating the screwdown position of said mill stand in accordance with the sum of said first and second roll force components.
Claim 5
Dependent Claim
30 words
The method of claim 2, with the work roll flattening calculation being in accordance with a predetermined relationship between said predetermined rolling operation and the width of said work strip.
Claim 6
Dependent Claim
43 words
The method of claim 2, with the prediction of said second roll force component being in accordance with the magnitude of said work roll flattening in relation to the magnitude of the desired delivery thickness of said work strip from said mill stand.
Claim 7
Dependent Claim
30 words
The method of claim 2, with said screwdown position calculation including a consideration of the difference between the length of said work rolls and the width of said work strip.
Claim 8
Independent Claim
112 words
An apparatus for controlling the screwdown position of a rolling mill stand in relation to a stand roll force required to deliver a desired thickness of work strip from said stand, the combination of first means for determining the work roll flattening in relation to the desired operation of said stand to deliver said desired work strip thickness from said stand, second means for determining the screwdown position of said stand to provide said desired operation of said stand in consideration of said work roll flattening so the resulting screwdown position of said stand permits said work roll flattening to occur when the desired work strip thickness is delivered from said stand.
Claim 9
Independent Claim
112 words
An apparatus for controlling the screwdown position of a rolling mill stand in relation to a stand roll force required to deliver a desired thickness of work strip from said stand, the combination of first means for determining the work roll flattening in relation to the desired operation of said stand to deliver said desired work strip thickness from said stand, second means for determining the screwdown position of said stand to provide said desired operation of said stand in consideration of said work roll flattening so the resulting screwdown position of said stand permits said work roll flattening to occur when the desired work strip thickness is delivered from said stand.
Claim 10
Dependent Claim
43 words
The apparatus of claim 6, with said first means determining the work roll flattening in accordance with the width of said work strip and a predetermined work roll force required to roll said work strip to deliver said desired thickness from said stand.
Claim 11
Dependent Claim
49 words
The apparatus of claim 6, including third means for comparing said desired work strip delivery thickness from said stand and said work roll flattening to determine if said screwdown position should be modified in relation to the touching of the work rolls beyond the width of said work strip.
Claim 12
Dependent Claim
44 words
The apparatus of claim 7, with said second means determining the screwdown position in relation to the sum of said predetermined work roll force and any additional roll force provided in relation to the work rolls touching beyond the width of said work strip.
Claim 13
Dependent Claim
44 words
The apparatus of claim 6, including third means operative to determine if the work rolls of said mill stand are tOuching together beyond the width of said work strip and determining the modification of said screwdown position required to compensate for this touching condition.
Claim 14
Dependent Claim
47 words
The apparatus of claim 6, including third means for calculating the roll force component relative to said work rolls touching together beyond the width of the work strip, with said second means being responsive to said roll force component for the calculation of said stand screwdown setting.
Claim 15
Dependent Claim
172 words
In apparatus for establishing the unloaded work roll position of a rolling mill stand in relation to a predetermined roll force to effect a work strip desired delivery thickness from said stand, the combination of means for determining a first flattening condition of at least one work roll relative to said work strip and the application of said predetermined roll force, means for comparing said first flattening condition with said desired delivery thickness to determine if the work rolls touch together beyond the width of said work strip, means for determining a second flattening condition of at least one work roll relative to the touching together of said work rolls, and means for determining said unloaded work roll position to provide one of a first operation of said mill stand in accordance with said first flattening condition when the work rolls do not touch together and a second operation of said mill stand in accordance with said first flattening condition and said second flattening condition when the work rolls do touch together.
Claim 16
Dependent Claim
172 words
In apparatus for establishing the unloaded work roll position of a rolling mill stand in relation to a predetermined roll force to effect a work strip desired delivery thickness from said stand, the combination of means for determining a first flattening condition of at least one work roll relative to said work strip and the application of said predetermined roll force, means for comparing said first flattening condition with said desired delivery thickness to determine if the work rolls touch together beyond the width of said work strip, means for determining a second flattening condition of at least one work roll relative to the touching together of said work rolls, and means for determining said unloaded work roll position to provide one of a first operation of said mill stand in accordance with said first flattening condition when the work rolls do not touch together and a second operation of said mill stand in accordance with said first flattening condition and said second flattening condition when the work rolls do touch together.
Claim 17
Dependent Claim
35 words
The apparatus of claim 1, with said second means determining said additional stand roll force in accordance with the additional roll flattening related to the rolls touching together beyond the width of the work strip.
Claim 18
Dependent Claim
57 words
The method of claim 2, with said screwdown position calculation being in accordance with said sum and said first roll flattening condition when the work rolls are touching and being in accordance with said first roll force component and said roll flattening condition when the work rolls are not touching beyond the width of said work strip.
References Cited (Backward Citations)
US3253438A
Cited
US3330142A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |