US3722244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling continuous rolling of metal strips
Assignee: JFE Engineering Corp
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Filing: 1971-02-26
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Granted: 1973-03-27
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Expires: 1991-02-26
Abstract
Abstract In the continuous rolling of a metal strip by means of a plurality of tandem mill stands, the gauge of the strip is varied by varying the rolling speed of a particular mill stand and of suceeding and or preceding mill stands by the same increment when a gauge varying point of the strip reaches the particular mill stand, and then the rolling speeds of the succeeding and/or preceding mill stands are successively varied by the same increment, thereby finally varying the rolling speed of all stands to the speeds required to produce a strip of a given gauge.
Inventors
- 👤 M Ishida
- 👤 M Kamata
- 👤 S Fujii
- 👤 H Kuwamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:25
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/16; B21B37/24; B21B37/26
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
154 words
In the continuous rolling of a metal strip by means of a plurality of tandem mill stands, a method of controlling the rolling operation comprising the steps of: detecting a gauge varying point of the metal strip at a given mill stand; varying the rolling speeds of said given mill stand and of succeeding mill stands in the direction of strip movement by the same increment when said gauge varying point of said metal strip reaches said given mill stand; and then successively varying the rolling speeds of said succeeding mill stands in order by the same increment upon said gauge varying point reaching respective successive mill stands, the rolling speeds of the preceding mill stands not being varied as a function of said gauge varying point reaching said successive mill stands, thereby finally varying the rolling speeds of all mill stands to the speeds required to produce a strip of a given gauge.
Claim 2
Dependent Claim
154 words
In the continuous rolling of a metal strip by means of a plurality of tandem mill stands, a method of controlling the rolling operation comprising the steps of: detecting a gauge varying point of the metal strip at a given mill stand; varying the rolling speeds of said given mill stand and of succeeding mill stands in the direction of strip movement by the same increment when said gauge varying point of said metal strip reaches said given mill stand; and then successively varying the rolling speeds of said succeeding mill stands in order by the same increment upon said gauge varying point reaching respective successive mill stands, the rolling speeds of the preceding mill stands not being varied as a function of said gauge varying point reaching said successive mill stands, thereby finally varying the rolling speeds of all mill stands to the speeds required to produce a strip of a given gauge.
Claim 3
Dependent Claim
161 words
In the continuous rolling of a metal strip by means of a plurality of tandem mills, a method of controlling the rolling operation comprising the steps of: detecting a gauge varying point of the metal strip at a given mill stand; varying the rolling speeds of said given mill stand and of preceding mill stands in the direction opposite to the direction of strip movement by the same increment when said gauge varying point of said metal strip reaches said given mill stand; and then successively varying the rolling speeds of said preceding mill stands in order by the same increment upon said gauge varying reaching respective successive mill stands, the rolling speeds of the succeeding mill stands in the direction of strip movement not being varied as a function of said gauge varying point reaching each successive mill stand, thereby finally varying the rolling speeds of all stands to the speeds required to produce a strip of a given gauge.
Claim 4
Dependent Claim
161 words
In the continuous rolling of a metal strip by means of a plurality of tandem mills, a method of controlling the rolling operation comprising the steps of: detecting a gauge varying point of the metal strip at a given mill stand; varying the rolling speeds of said given mill stand and of preceding mill stands in the direction opposite to the direction of strip movement by the same increment when said gauge varying point of said metal strip reaches said given mill stand; and then successively varying the rolling speeds of said preceding mill stands in order by the same increment upon said gauge varying reaching respective successive mill stands, the rolling speeds of the succeeding mill stands in the direction of strip movement not being varied as a function of said gauge varying point reaching each successive mill stand, thereby finally varying the rolling speeds of all stands to the speeds required to produce a strip of a given gauge.
Claim 5
Dependent Claim
28 words
The method according to claim 1 comprising detecting said gauge varying point at each mill stand, and varying said speeds responsive to said detection of gauge varying point.
Claim 6
Dependent Claim
28 words
The method according to claim 2 comprising detecting said gauge varying point at each mill stand, and varying said speeds responsive to said detections of gauge varying point.
Claim 7
Dependent Claim
85 words
The method according to claim 1 wherein said rolling mill comprises at least three mill stands, and the rolling speed of said three mill stands are varied by the same increment when said gauge varying point of said metal strip reaches the first of said mill stands, and the rolling speeds of the second and third mill stands being varied by the same increment which is different from the first-mentioned increment, when said gauge varying point of said metal strip reaches the second mill stand.
Claim 8
Dependent Claim
42 words
The method according to claim 5 wherein the rolling speed of the third mill stand is varied by an increment which is different from the previously mentioned increments when said gauge varying point of said metal strip reaches said third mill stand.
Claim 9
Dependent Claim
76 words
The method according to claim 2 wherein said rolling mill comprises at least three mill stands and wherein the rolling speeds of the first mill stand is varied by a given increment when said gauge varying point reaches said first mill stand, and the rolling speeds of said first and second mill stands are varied by the same increment which is different from said given increment when said gauge varying point reaches said second mill stand.
Claim 10
Dependent Claim
39 words
The method according to claim 7 wherein the rolling speeds of said three mill stands are varied by the same increment which is different from said prevIously mentioned increments when said gauge varying point reaches said third mill stand.
Claim 11
Dependent Claim
90 words
The method according to claim 1 wherein the step of varying the rolling speeds comprises determining the rolling speed of the strip at a particular mill stand; changing the speed at said particular mill stand to a new given value; dividing said new given value by the determined speed at said particular mill stand; multiplying the ratio obtained by said dividing step by the rolling speed at said successive mill stands; and controlling the motor speeds at said successive mill stands to correspond to the value obtained by said multiplication.
Claim 12
Dependent Claim
90 words
The method according to claim 2 wherein the step of varying the rolling speeds comprises determining the rolling speed of the strip at a particular mill stand; changing the speed at said particular mill stand to a new given value; dividing said new given value by the determined speed at said particular mill stand; multiplying the ratio obtained by said dividing step by the rolling speed at said successive mill stands; and controlling the motor speeds at said preceding mill stands to correspond to the value obtained by said multiplication.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |