GB1262742A - Predictive gauge control method and apparatus with automatic plasticity determination for metal rolling mills - Google Patents
Predictive gauge control method and apparatus with automatic plasticity determination for metal rolling millsInfo
- Publication number
- GB1262742A GB1262742A GB532669A GB532669A GB1262742A GB 1262742 A GB1262742 A GB 1262742A GB 532669 A GB532669 A GB 532669A GB 532669 A GB532669 A GB 532669A GB 1262742 A GB1262742 A GB 1262742A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stand
- screwdown
- determined
- gauge
- mill
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
1,262,742. Automatic control systems. WESTINGHOUSE ELECTRIC CORP. Jan.31, 1969 [Feb. 2, 1968], No. 5326/69. Heading G3R. A gauge control system for a rolling mill having at least one stand comprises means for adjusting the screwdown by an amount which is predictively determined from the stand spring constant, the plasticity of the material being worked (hot steel strip) which is determined "on line", and the gauge error which in turn is determined from measurements of the roll force and the unloaded roll opening and reference values for these quantities. A prior art system (Spec No 1248978) is discussed in which gauge error and the necessary screwdown correction is determined from measurements of the rolls gap and load force, due allowance being made for mill "spring" and workpiece plasticity, values for which are derived from tables. In the present invention the plasticity is determined "on line", by dividing the load force by the reduction in thickness through the stand. In general, in a multistand mill, the thickness at entry and exit at any stand N is determined from the screwdown position, the force and the spring constant of the stands N-1 and N respectively, but the final thickness is measured by an X-ray gauge 42. In using the values for stand N-1 allowance is made for the transport time between N-1 and N. For the first stand or in a single stand reversing mill entry gauge is measured. Compensation may be provided during acceleration and deceleration by adding a screwdown correcting term equal to a constant times the difference between the instantaneous and the initial speed. Allowance (unspecified) can be made for the elasticity of the workpiece. Alternatively the thickness at exit and entry of any stand may be derived from a find thickness measurement and speed measurements (mass flow technique). In the multistand mill shown, each screwdown position is determined by a digital computer 38 using three terms, (i) a proportional plus integral term from the X-ray gauge 42, the proportionality and integrating constants being different for each stand, (ii) compensating term for acceleration or deceleration, and (iii) the correcting term allowing for mill spring and wcrkpiece plasticity as derived above. A dead band is set for each stand so that small errors affect the last two or three stands only. The calculation is performed at intervals, at a selected rate. The screwdown control is rendered inoperative if a number of conditions are not met, or if the calculated correction is outside limits. Each screwdown is operated by a servo motor 28 with a closed loop control having rate feedback provided by a tachogenerator 29. Tension may be controlled by "loop detectors" L which adjust the speed of each stand and the screwdown correcting signals are fed to these systems to enable them to anticipate the resulting charge of speed.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US70271368A | 1968-02-02 | 1968-02-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1262742A true GB1262742A (en) | 1972-02-02 |
Family
ID=24822308
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB532669A Expired GB1262742A (en) | 1968-02-02 | 1969-01-31 | Predictive gauge control method and apparatus with automatic plasticity determination for metal rolling mills |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE727472A (en) |
CA (1) | CA932432A (en) |
FR (1) | FR2001231A1 (en) |
GB (1) | GB1262742A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8516869B2 (en) | 2008-03-14 | 2013-08-27 | Siemens Aktiengesellschaft | Operating method for a cold-rolling line train with improved dynamics |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4937910B1 (en) * | 1970-06-18 | 1974-10-14 | ||
BE793763A (en) * | 1972-11-06 | 1973-07-09 | Westinghouse Electric Corp | LAMINATOR GAUGE CONTROL PROCESS AND APPARATUS INCLUDING THE DETERMINATION OF PLASTICITY |
US5054302A (en) * | 1989-04-07 | 1991-10-08 | Kawasaki Steel Corporation | Hardness compensated thickness control method for wet skin-pass rolled sheet |
CN109684687B (en) * | 2018-12-11 | 2023-02-28 | 中国航发贵州黎阳航空动力有限公司 | Modeling method for rotor blade forging tip process extension section |
-
1969
- 1969-01-16 CA CA040262A patent/CA932432A/en not_active Expired
- 1969-01-27 BE BE727472D patent/BE727472A/xx unknown
- 1969-01-31 FR FR6902158A patent/FR2001231A1/fr not_active Withdrawn
- 1969-01-31 GB GB532669A patent/GB1262742A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8516869B2 (en) | 2008-03-14 | 2013-08-27 | Siemens Aktiengesellschaft | Operating method for a cold-rolling line train with improved dynamics |
Also Published As
Publication number | Publication date |
---|---|
CA932432A (en) | 1973-08-21 |
FR2001231A1 (en) | 1969-09-26 |
BE727472A (en) | 1969-07-01 |
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