US3882709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for controlling the profile of workpieces on rolling mills
Assignee: Nippon Steel Corp
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Filing: 1973-10-15
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Granted: 1975-05-13
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Expires: 1993-10-15
Abstract
Abstract There is described a method for controlling the profile of a workpiece on a rolling mill, wherein the workpiece is imparted with a predetermined profile in the roughing stage which is suitable for further control in the following finishing stage. In the finishing stage, the desired profile of the workpiece is attained by adjustment of one or a combination of factors including modifying the rolling loads of the respective roller stands preceding the last stand, cooling of the rolls, and changing the rolling pitch. The final shape control of the workpiece is carried out on the last stand. The adjustment of the rolling load is performed by simulating the desired workpiece profile by means of an even ordered function whose constants represent the load determining factors and by adjusting such constants in accordance with the desired changes in the load conditions.
Inventors
- 👤 Toshiharu Kawamoto
- 👤 Yoji Itoh
- 👤 Kouji Hiyoudo
- 👤 Kenya Fukushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:03
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/28; B21B37/38; B21B1/00; B21B1/22; B21B1/24; B21B1/26; B21B1/30; B21B1/32; B21B1/34; B21B27/00; B21B27/06; B21B27/10; B21B2027/103
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
92 words
A method of controlling the crown of a workpiece passing through a rolling mill comprising the steps of roughly adjusting the crown by means of a first roughing stage of the rolling mill to produce a profile on the workpiece which is within an allowable predetermined range for a successive second finishing stage of the rolling mill, and finely adjusting the crown by means of said second, finishing stage of the rolling mill to produce the desired profile on the workpiece by utilizing all but the final stand within said finishing stage.
Claim 2
Independent Claim
92 words
A method of controlling the crown of a workpiece passing through a rolling mill comprising the steps of roughly adjusting the crown by means of a first roughing stage of the rolling mill to produce a profile on the workpiece which is within an allowable predetermined range for a successive second finishing stage of the rolling mill, and finely adjusting the crown by means of said second, finishing stage of the rolling mill to produce the desired profile on the workpiece by utilizing all but the final stand within said finishing stage.
Claim 3
Dependent Claim
21 words
The method of claim 1 further comprising the step of controlling the flatness of said workpiece by adjusting said last stand.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein said crown is controlled by adjusting the roll temperatures of the stands.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein the crown control of said roughing stage is performed by adjusting the roll benders.
Claim 6
Dependent Claim
18 words
The method of claim 1 wherein said crown is controlled by adjusting the rolling pitches at the stands.
Claim 7
Dependent Claim
18 words
The method of claim 1 wherein wedge control of the workpiece is performed solely at said roughing stage.
Claim 8
Dependent Claim
30 words
The method of claim 6 wherein said wedge control of the workpiece is performed by modifying the leveling of at least one roller of a stand in said roughing stage.
Claim 9
Dependent Claim
18 words
The method of claim 1 wherein said crown is controlled by modifying the load distribution among the stands.
Claim 10
Dependent Claim
39 words
The method of claim 8 wherein said modifying of the load distribution is effected by simulating the desired crown by an even ordered function and altering the constants of said function to control the load distribution among the stands.
Claim 11
Dependent Claim
36 words
The method of claim 9 further comprising simulating desired crowns at each stands by an even ordered function and altering the constants of the function at each stands to control the load distribution among the stands.
References Cited (Backward Citations)
US3049950A
Cited
US3248916A
Cited
US3387470A
Cited
US3475935A
Cited
US3570288A
Cited
US3620058A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |