US3628358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of revising workpiece temperature estimates or measurements using workpiece deformation behavior
Assignee: General Electric Co
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Filing: 1969-10-07
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Granted: 1971-12-21
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Expires: 1989-10-07
Abstract
Abstract For use in setting up a rolling mill, a method of revising an estimate or measurement of workpiece temperature based on prior deformation behavior of the workpiece. According to the method, roll forces are expressed as functions of workpiece temperatures for different rolling conditions. Prior to a rolling pass during which a revised temperature is to be established, one of these functions is selected on the basis of anticipated rolling conditions. Using an initially established temperature, the selected function yields a predicted roll force value. When the rolling pass is executed, a measured roll force value is used with the selected function to establish an apparent workpiece temperature. The revised temperature, taken for purposes of stability to be an average of the initially established temperature and the apparent temperature, is used in force and draft calculations needed for setting up the rolling mill for upcoming rolling passes.
Inventors
- 👤 Donald J Fapiano
- 👤 Allyn S Norton Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:16
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/74; B21B37/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
281 words
For use in operating a rolling mill having means for measuring extant roll forces during sequential rolling operations in roughing and finishing mills where roll forces are known as functions of workpiece temperatures for diverse rolling conditions, a method of revising an initially established workpiece temperature comprising the steps of: a. selecting at least one roll force-workpiece temperature function corresponding to the dimensions, composition and planned drafts of the workpiece for a plurality of rolling operations in the roughing mill, b. establishing initial temperatures of said workpiece at which rolling is anticipated to occur during said plurality of rolling operations in said roughing mill, c. theoretically predicting from said selected roll forceworkpiece temperature functions the roll forces which should occur during each of said plurality of roughing mill rolling operations for the initially established temperatures of the workpiece, d. measuring the roll forces which actually do occur during the plurality of roughing mill rolling operations, e. entering each of the selected functions with the appropriate measured roll forces to obtain the temperature values associated with the measured roll forces for each of said plurality of roughing mill rolling operations, f. establishing the differences between the initially established temperatures and the temperature values associated with the measured roll forces for each of the plurality of roughing mill rolling operations, g. averaging the temperature differences obtained during each of the plurality of rolling operations of the roughing mill, and h. revising the initially established temperature of the workpiece as a function of the average temperature difference only upon entry of the workpiece into the finishing mill to obtain a revised temperature to be used in calculating force and draft in the finishing mill.
Claim 2
Dependent Claim
281 words
For use in operating a rolling mill having means for measuring extant roll forces during sequential rolling operations in roughing and finishing mills where roll forces are known as functions of workpiece temperatures for diverse rolling conditions, a method of revising an initially established workpiece temperature comprising the steps of: a. selecting at least one roll force-workpiece temperature function corresponding to the dimensions, composition and planned drafts of the workpiece for a plurality of rolling operations in the roughing mill, b. establishing initial temperatures of said workpiece at which rolling is anticipated to occur during said plurality of rolling operations in said roughing mill, c. theoretically predicting from said selected roll forceworkpiece temperature functions the roll forces which should occur during each of said plurality of roughing mill rolling operations for the initially established temperatures of the workpiece, d. measuring the roll forces which actually do occur during the plurality of roughing mill rolling operations, e. entering each of the selected functions with the appropriate measured roll forces to obtain the temperature values associated with the measured roll forces for each of said plurality of roughing mill rolling operations, f. establishing the differences between the initially established temperatures and the temperature values associated with the measured roll forces for each of the plurality of roughing mill rolling operations, g. averaging the temperature differences obtained during each of the plurality of rolling operations of the roughing mill, and h. revising the initially established temperature of the workpiece as a function of the average temperature difference only upon entry of the workpiece into the finishing mill to obtain a revised temperature to be used in calculating force and draft in the finishing mill.
Claim 3
Dependent Claim
244 words
For use in setting up a rolling mill for executing finishing phase rolling operations when the mill includes means for measuring extant roll forces during at least one roughing phase rolling operation and roll forces are known as functions of workpiece temperature for different dimensions, compositions and planned drafts of the workpiece, the method of revising an initially established value of workpiece transfer temperature at the beginning of the finishing phase comprising the steps of: a. selecting a roll force-workpiece temperature function in accordance with the dimension, composition and planned draft of the workpiece for at least one roughing mill rolling operation, b. establishing the initial temperature of said workpiece at which rolling is anticipated to occur during said roughing mill rolling operation, c. predicting from said roll force-workpiece temperature function the roll forces which should occur during said roughing mill rolling operation for the initially established temperature of the workpiece, d. measuring the roll forces which actually do occur during the roughing phase operation, e. obtaining the quotient of the theoretically predicted roll force and the actually measured roll force utilizing electronic dividing means to obtain a force ratio, f. determining the temperature difference corresponding to said force ratio by accessing selected functions defining force ratio as a function of workpiece temperature, and g. modifying the initially established value of workpiece transfer temperature at the initiation of the finishing phase by an amount proportional to the temperature difference determined from the force ratio.
Claim 4
Dependent Claim
244 words
For use in setting up a rolling mill for executing finishing phase rolling operations when the mill includes means for measuring extant roll forces during at least one roughing phase rolling operation and roll forces are known as functions of workpiece temperature for different dimensions, compositions and planned drafts of the workpiece, the method of revising an initially established value of workpiece transfer temperature at the beginning of the finishing phase comprising the steps of: a. selecting a roll force-workpiece temperature function in accordance with the dimension, composition and planned draft of the workpiece for at least one roughing mill rolling operation, b. establishing the initial temperature of said workpiece at which rolling is anticipated to occur during said roughing mill rolling operation, c. predicting from said roll force-workpiece temperature function the roll forces which should occur during said roughing mill rolling operation for the initially established temperature of the workpiece, d. measuring the roll forces which actually do occur during the roughing phase operation, e. obtaining the quotient of the theoretically predicted roll force and the actually measured roll force utilizing electronic dividing means to obtain a force ratio, f. determining the temperature difference corresponding to said force ratio by accessing selected functions defining force ratio as a function of workpiece temperature, and g. modifying the initially established value of workpiece transfer temperature at the initiation of the finishing phase by an amount proportional to the temperature difference determined from the force ratio.
Claim 5
Dependent Claim
62 words
A method of revising an initially established value of workpiece transfer temperature according to claim 2 further including averaging the force ratio over a plurality of roughing phase rolling operations to obtain an average force ratio, determining the temperature difference corresponding to said average fOrce ratio and modifying the workpiece transfer temperature by the temperature difference corresponding to the average force ratio.
Claim 6
Independent Claim
219 words
An apparatus for use in a rolling mill having means for measuring roll forces during at least one rolling operation where the ratio of measured to predicted roll forces are expressed as inverse approximately linear functions of workpiece temperatures for different rolling conditions, said apparatus including: a. dividing means having one input corresponding to the roll force required at a rolling stand to produce an anticipated draft in a workpiece of known composition and dimension at an initially established temperature and a second input corresponding to the roll force actually measured at the rolling stand, said dividing means establishing a ratio of measured to predicted roll force for at least one rolling operation, b. storage means connected to said dividing means for receiving and storing each of said force ratios, c. averaging means connected to said storage means for calculating an average force ratio, d. function-generating means having inputs representing the average force ratio and the slope of the approximately linear function defining workpiece temperature as a function of force ratio, said function-generating means producing an output signal corresponding to the workpiece temperature deviation between the calculated average force ratio and a force ratio of 1.0, and e. means for varying the initially established workpiece temperature by an amount proportional to the output signal from said function generator means.
Claim 7
Independent Claim
219 words
An apparatus for use in a rolling mill having means for measuring roll forces during at least one rolling operation where the ratio of measured to predicted roll forces are expressed as inverse approximately linear functions of workpiece temperatures for different rolling conditions, said apparatus including: a. dividing means having one input corresponding to the roll force required at a rolling stand to produce an anticipated draft in a workpiece of known composition and dimension at an initially established temperature and a second input corresponding to the roll force actually measured at the rolling stand, said dividing means establishing a ratio of measured to predicted roll force for at least one rolling operation, b. storage means connected to said dividing means for receiving and storing each of said force ratios, c. averaging means connected to said storage means for calculating an average force ratio, d. function-generating means having inputs representing the average force ratio and the slope of the approximately linear function defining workpiece temperature as a function of force ratio, said function-generating means producing an output signal corresponding to the workpiece temperature deviation between the calculated average force ratio and a force ratio of 1.0, and e. means for varying the initially established workpiece temperature by an amount proportional to the output signal from said function generator means.
References Cited (Backward Citations)
US3253438A
Cited
US3411332A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |