Patent US4461854A successfully refreshed from Google Patents.
Patent US3695594A successfully refreshed from Google Patents.
US3695594A
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US
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Method and apparatus for operating a pusher type furnace
Assignee: Koninklijke Nederlandsche Hoogovens en Staalfabrieken NV
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Filing: 1970-06-16
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Granted: 1972-10-03
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Expires: 1990-06-16
Abstract
Abstract A method and an apparatus for operating a pusher type furnace for reheating metal slabs for rolling sheet or strip therefrom, including an advance control of fuel quantity supplied to different zones of the furnace and an advance control of the pushing speed through the furnace on the basis of information about the slabs, the final product to be obtained and the rolling practice, such information being processed during the rolling.
Inventors
- 👤 Frans Hollander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:46
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/30; F27B9/40; B; B21; B21B; B21B45/00; B21B45/004; F27B9/14; F27B9/20; F27B9/22; F27D; F27D19/00; F27D2019/0028; F27D2019/0034; F27D2019/0059; F27M; F27M2001/00; F27M2001/15; F27M2001/1539; F27M2001/1547; F27M2001/1552; F27M2003/00; F27M2003/02
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
297 words
In a method for reheating work in the form of metal slabs for rolling sheet or strip therefrom with the aid of apparatus of the type that includes: i. a pusher type furnace having an upstream end into which the metal slabs are fed and having a downstream end to which they are pushed during the reheating, said furnace having fuel fed heating devices therein, ii. a rolling mill having an upstream end to which reheated slabs are delivered from the downstream end of said furnace, and iii. a computer, the improvement which comprises: a. supplying to the computer advance data as to 1. the dimensions of the slabs to be heated, 2. the desired dimensions of the sheets to be rolled therefrom, respectively, 3. the finishing temperature of such sheets desired to be attained at the end of the hot rolling, and 4. the rolling mill practice desired to be followed in such rolling, b. programming the computer to calculate from such advance data 5. the calculated temperature of the work required at the beginning of the finish rolling thereof, 6. the delivery temperature of the slabs from the downstream end of the furnace needed to impart said calculated temperature to the work at the beginning of the finish rolling, 7. the rate of delivery of the slabs from the downstream end of the furnace calculated to conform to said rolling mill practice, and 8. the calculated rate of flow of fuel to the furnace needed to impart said delivery temperature to the slabs at said calculated rate of delivery, and c. adjusting the rate of pushing of said slabs in the furnace and the flow of fuel to said heating devices primarily to accord with the rates calculated in steps (b) (7) and (b) (8).
Claim 2
Dependent Claim
297 words
In a method for reheating work in the form of metal slabs for rolling sheet or strip therefrom with the aid of apparatus of the type that includes: i. a pusher type furnace having an upstream end into which the metal slabs are fed and having a downstream end to which they are pushed during the reheating, said furnace having fuel fed heating devices therein, ii. a rolling mill having an upstream end to which reheated slabs are delivered from the downstream end of said furnace, and iii. a computer, the improvement which comprises: a. supplying to the computer advance data as to 1. the dimensions of the slabs to be heated, 2. the desired dimensions of the sheets to be rolled therefrom, respectively, 3. the finishing temperature of such sheets desired to be attained at the end of the hot rolling, and 4. the rolling mill practice desired to be followed in such rolling, b. programming the computer to calculate from such advance data 5. the calculated temperature of the work required at the beginning of the finish rolling thereof, 6. the delivery temperature of the slabs from the downstream end of the furnace needed to impart said calculated temperature to the work at the beginning of the finish rolling, 7. the rate of delivery of the slabs from the downstream end of the furnace calculated to conform to said rolling mill practice, and 8. the calculated rate of flow of fuel to the furnace needed to impart said delivery temperature to the slabs at said calculated rate of delivery, and c. adjusting the rate of pushing of said slabs in the furnace and the flow of fuel to said heating devices primarily to accord with the rates calculated in steps (b) (7) and (b) (8).
Claim 3
Dependent Claim
11 words
the desired dimensions of the sheets to be rolled therefrom, respectively,
Claim 4
Dependent Claim
11 words
the desired dimensions of the sheets to be rolled therefrom, respectively,
Claim 5
Dependent Claim
11 words
the desired dimensions of the sheets to be rolled therefrom, respectively,
Claim 6
Dependent Claim
11 words
the desired dimensions of the sheets to be rolled therefrom, respectively,
Claim 7
Dependent Claim
86 words
An improved method as claimed in claim 1 in which the improvement further comprises d. supplying to the computer during the reheating operation data as to the temperatures actually existing in the furnace and the pushing rates actually being effected in the furnace, and e. secondarily adjusting at least one of the rates of flow of fuel and of pushing of the slab in the furnace to reduce deviations between the data supplied in step (d) and the corresponding item of data calculated in step (b).
Claim 8
Dependent Claim
90 words
An improved method as claimed in claim 2, in which the actual temperature data supplied in step (d) is based on the course of the surface temperatures of the slabs in the furnace, in which the computer is programmed to calculate the average temperatures of the slabs on the basis of said surface temperatures and the course of the temperature equalization through the work, and in which the secondary adjustments of step (e) are effected to reduce deviations between said average temperatures and the temperatures calculated in step (b) (6).
Claim 9
Dependent Claim
18 words
the finishing temperature of such sheets desired to be attained at the end of the hot rolling, and
Claim 10
Dependent Claim
18 words
the finishing temperature of such sheets desired to be attained at the end of the hot rolling, and
Claim 11
Dependent Claim
18 words
the finishing temperature of such sheets desired to be attained at the end of the hot rolling, and
Claim 12
Dependent Claim
18 words
the finishing temperature of such sheets desired to be attained at the end of the hot rolling, and
Claim 13
Dependent Claim
21 words
the rolling mill practice desired to be followed in such rolling, b. programming the computer to calculate from such advance data
Claim 14
Dependent Claim
21 words
the rolling mill practice desired to be followed in such rolling, b. programming the computer to calculate from such advance data
Claim 15
Dependent Claim
83 words
An improved method as claimed in claim 1, in which the improvement further comprises d. in the event of a delay in the rolling program, adjusting the rate of flow of fuel to the furnace to a lower level for the duration of said event, and e. after termination of such event, temporarily increasing the rate of pushing of the slabs through the furnace and the rate of flow of fuel to the furnace until the arrears resulting from such event are overcome.
Claim 16
Dependent Claim
69 words
the rolling mill practice desired to be followed in such rolling, and b. adjusting and control means having advance data inputs connected to receive the advance data from said means (a) and having outputs connected to control the flow of fuel to said heating devices and the rate of pushing of the slabs in the furnace, said adjusting and control means being programmed to calculate from said advance data
Claim 17
Dependent Claim
69 words
the rolling mill practice desired to be followed in such rolling, and b. adjusting and control means having advance data inputs connected to receive the advance data from said means (a) and having outputs connected to control the flow of fuel to said heating devices and the rate of pushing of the slabs in the furnace, said adjusting and control means being programmed to calculate from said advance data
Claim 18
Dependent Claim
69 words
An improved method as claimed in claim 1, particularly applicable when fuel fed heating devices in the furnace are arranged in an upstream set near the upstream end of said furnace and in a downstream set near the downstream end of the furnace, and in which the adjustment of the rate of flow of fuel to said heating devices is effected mainly in said upstream set of heating devices.
Claim 19
Dependent Claim
15 words
the calculated temperature of the work required at the beginning of the finish rolling thereof,
Claim 20
Dependent Claim
15 words
the calculated temperature of the work required at the beginning of the finish rolling thereof,
Claim 21
Dependent Claim
15 words
the calculated temperature of the work required at the beginning of the finish rolling thereof,
Claim 22
Dependent Claim
15 words
the calculated temperature of the work required at the beginning of the finish rolling thereof,
Claim 23
Dependent Claim
29 words
the delivery temperature of the slabs from the downstream end of the furnace needed to impart said calculated temperature to the work at the beginning of the finish rolling,
Claim 24
Dependent Claim
29 words
the delivery temperature of the slabs from the downstream end of the furnace needed to impart said calculated temperature to the work at the beginning of the finish rolling,
Claim 25
Dependent Claim
29 words
the delivery temperature of the slabs from the downstream end of the furnace needed to impart said calculated temperature to the work at the beginning of the finish rolling,
Claim 26
Dependent Claim
29 words
the delivery temperature of the slabs from the downstream end of the furnace needed to impart said calculated temperature to the work at the beginning of the finish rolling,
Claim 27
Dependent Claim
90 words
An improved method as claimed in claim 1, particularly applicable when fuel fed heating devices in the furnace are arranged in an upstream set above and below the path of pushing of the slabs in the furnace, and in a downstream set above the path of pushing of the slabs in the furnace, and in a third set intermediate said upstream and downstream sets, and in which the adjustment of the rate of flow of fuel to said heating devices is effected mainly in said upstream set of heating devices.
Claim 28
Dependent Claim
160 words
An improved method as claimed in claim 1, applicable when the rolling mill comprises a finishing mill with a cogging mill upstream thereof, in which, in step (b) data item (5) is calculated on the basis of a desired optimum rolling and coiling program in and following such finishing mill, by calculating therefRom the speed of passage of the slabs through the furnace and the value of temperature of the work desired at the upstream end of the finishing mill, calculating from said value of temperature the temperature level for the work leaving the cogging mill, and calculating from said temperature level in combination with data item (1) supplied to the computer in step (a), the required average temperatures for the slabs when they leave the downstream end of the furnace; and in which the data of item (8) of step (b) are calculated from said average temperature and the calculated rate of pushing of the slab through the furnace.
Claim 29
Dependent Claim
23 words
the rate of delivery of the slabs from the downstream end of the furnace calculated to conform to said rolling mill practice, and
Claim 30
Dependent Claim
23 words
the rate of delivery of the slabs from the downstream end of the furnace calculated to conform to said rolling mill practice, and
Claim 31
Dependent Claim
23 words
the rate of delivery of the slabs from the downstream end of the furnace calculated to conform to said rolling mill practice, and
Claim 32
Dependent Claim
23 words
the rate of delivery of the slabs from the downstream end of the furnace calculated to conform to said rolling mill practice, and
Claim 33
Dependent Claim
61 words
the calculated rate of flow of fuel to the furnace needed to impart said delivery temperature to the slabs at said calculated rate of delivery, and c. adjusting the rate of pushing of said slabs in the furnace and the flow of fuel to said heating devices primarily to accord with the rates calculated in steps (b) (7) and (b) (8).
Claim 34
Dependent Claim
61 words
the calculated rate of flow of fuel to the furnace needed to impart said delivery temperature to the slabs at said calculated rate of delivery, and c. adjusting the rate of pushing of said slabs in the furnace and the flow of fuel to said heating devices primarily to accord with the rates calculated in steps (b) (7) and (b) (8).
Claim 35
Dependent Claim
58 words
the calculated rate of flow of fuel to the furnace needed to impart said delivery temperature to the slabs at said calculated rate of delivery, and to adjust the rate of pushing of said slabs in said furnace and the flow of fuel to said heating devices primarily to accord with the so calculated rates (7) and (8).
Claim 36
Dependent Claim
58 words
the calculated rate of flow of fuel to the furnace needed to impart said delivery temperature to the slabs at said calculated rate of delivery, and to adjust the rate of pushing of said slabs in said furnace and the flow of fuel to said heating devices primarily to accord with the so calculated rates (7) and (8).
Claim 37
Dependent Claim
100 words
In an apparatus for reheating work in the form of metal slabs for rolling sheet or strip therefrom, said apparatus being of the type which comprises i. a pusher type furnace having an upstream end into which the metal slabs are fed and having a downstream end to which they are pushed during the reheating, said furnace having fuel fed heating devices therein, ii. a rolling mill having an upstream end to which reheated slabs are delivered from the downstream end of said furnace, and iii. a computer, the improvement which comprises a. means for supplying advance data as to
Claim 38
Dependent Claim
100 words
In an apparatus for reheating work in the form of metal slabs for rolling sheet or strip therefrom, said apparatus being of the type which comprises i. a pusher type furnace having an upstream end into which the metal slabs are fed and having a downstream end to which they are pushed during the reheating, said furnace having fuel fed heating devices therein, ii. a rolling mill having an upstream end to which reheated slabs are delivered from the downstream end of said furnace, and iii. a computer, the improvement which comprises a. means for supplying advance data as to
Claim 39
Dependent Claim
103 words
Improved apparatus as claimed in claim 8, wherein said adjusting and control means (b) has further input means connected to receive from said rolling mill during its operation data as to the actual rolling practice being realized therein, and wherein said adjusting and control means further comprises means responsive to the data received by said further input means for secondarily adjusting at least one of the rates of flow of fuel and of pushing of the slabs in the furnace to reduce deviations between the data recorded by said further input means and the corresponding advance data received by said advance data inputs.
Claim 40
Dependent Claim
111 words
Improved apparatus as claimed in claim 8, wherein said adjusting and control means (b) has further input means connected to receive from said furnace during the reheating operation data as to the temperatures actually existing in the furnace and the pushing rates actually being effected therein, and wherein said adjusting and control means further comprises means responsive to the data received by said further input means for secondarily adjusting at least one of the rates of flow of fuel and of pushing of the slabs in the furnace to reduce deviations between the data received by said further input means and the corresponding advance data received by said advance data inputs.
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |