US3779054A - Coolant control for hot strip mill - Google Patents
Coolant control for hot strip mill Download PDFInfo
- Publication number
- US3779054A US3779054A US00231221A US3779054DA US3779054A US 3779054 A US3779054 A US 3779054A US 00231221 A US00231221 A US 00231221A US 3779054D A US3779054D A US 3779054DA US 3779054 A US3779054 A US 3779054A
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- United States
- Prior art keywords
- signal
- coolant
- strip
- temperature
- stands
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- Expired - Lifetime
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- 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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
Definitions
- the disclosure of the present invention relates to a strip temperature control method and apparatus for a finishing train of a hot strip rolling mill, including strip interstand coolant supply means, and a control for varying the rate of flow thereof, which includes a feedforward control signal wherein the rate of flow is, controlled in certain stands with reference to a computed temperature and a desired temprature of the strip as it leaves the train, and a feed-backward control signal wherein the rate of How is controlled in one or more stands with reference to the actual temperature and a desired temperature as it leaves the train.
- the presentinvention relates to a control system and method for use in operating a hot strip rolling mill, and particularly, in the operation of the finishing train thereof. It also relates to the employment of interstand coolant in the finishing train and, more particularly, to the employment of high pressure coolant means in the earlier stands and low pressure coolant means in the latter stands and, specifically, the last stand.
- the temperature of the strip during rolling in the finishing train in order to obtain uniform or constant strip delivery temperature usually provides means for adjusting the speed and, more particularly, the rate of acceleration of the finishing train as a function of the temperature taper in the strip being fed to the finishing train from the delay tablearranged between the finishing train and roughing train.
- the elimination of the temperature taper effect as it prevents the obtaining of a substantial constant delivery temperature, which results from the fact that the back portion of the strip is exposed to greater heat losses than the front portion and which losses decrease in a gradual manner, is extremely important not only from a metallurgical and quality standpoint, but also in obtaining uniform gauge and ease at which gauge control is obtainable.
- an object of the present invention to provide a control for the finishing train of a hot strip mill wherein the acceleration of the train is not dependent upon the longitudinal temperature profile of the strip being rolled, but instead the temperature profile thereof is taken care of with reference to maintaining the strip at a substantially uniform delivery temperature by providing strip coolant means and control means for applying'the coolant as a function both of computed and actual temperature values compared with an aimed or desired temperature value.
- Another object of the present invention is to employ said interstand coolant means for said first rate of flow control wherein the flow control is applied starting from the first stand succeedingly and cumulatively, but excluding one or more of the latter stands, and wherein said second rate of flow control is applied successively and cumulatively to said coolant means for the latter stands.
- An additional object of the present invention includes means for initiating. operation of the coolant means associated with the'last stand at a first selected rate of flow and after the comparison of the third and fourth signals at a second rate of flow.
- FIG. 1 is a diagrammatic view of the last roughing mill stand of a roughing mill train, the delay table, and the finishing train of a hot strip mill, including coolant headers for the finishing train, and an illustrative control system for controlling rate of flow of the headers to offset the longitudinal temperature profile in the strip and permit the mill to be operated at an optimum speed, and
- FIG. 2 is a second embodiment involving certain changes to the control system of FIG. 1.
- FIG. 1 shows the last stand of a six-stand hot roughing mill train which is identified as R6, and which is separated from the hot finishing mill train by a delay table 11, consisting, according to well-known practice, of a number of driven support rolls which collectively form a sufficient table length to permit the strip to exit from the roughing stand R6 before entering the first stand of the finishing train 10.
- a delay table 11 consisting, according to well-known practice, of a number of driven support rolls which collectively form a sufficient table length to permit the strip to exit from the roughing stand R6 before entering the first stand of the finishing train 10.
- Such a strip 14, in exaggerated form is shown on the delay table 11 in FIG. 1.
- the first portion of the finishing train 10 is made up of shear followed by two high-pressure descaling units 1 and 2 arranged in parallel spaced-apart fashion relative to the direction of travel of the strip 14, each having a top and bottom coolant supply header and all of which are located ahead of the first finishing stand, identified as F1.
- the remaining and succeeding tandemly arranged stands of the finishing train are correspondingly identified as F2 F7, respectively.
- the strip would be threaded through the mill and to the coiler, not shown, at a speed of approximately 2,000 f.p.m. Once coiling has commenced, the finishing train speed will be raised to about 4,200 f.p.m. at a typical acceleration rate of 500 ft./min./sec.
- the low pressure units 3, 7, 8 and 9 also can follow the teachings of well-known practice in rolling mills which, by way of example, can follow the type illustrated in FIG. 6 of an article entitled DESIGN AND CONTROL FOR ADVANCED RUNOUT TABLE PROCESSING by F. Hollander appearing in IRON AND STEEL EN- GINEER, March 1971, pp. 81 92, which operate at header pressures less than 10 PSI.
- a thickness indicator in the form of a typical X-ray unit 16 arranged between the rolls ofa runout table 17 comprising, according to wellknown practice, a plurality of driven rolls for conveying the strip to one of several provided downcoilers, not shown.
- temperature measuring devices such as, radiation pyrometers are provided to measure the temperature of the strip as it leaves the roughing stand R6, after the shear 15, and after the last finishing stand F7, which are identified in FIG. 1 as T T, and T respectively.
- T T the temperature of the strip as it leaves the roughing stand R6, after the shear 15, and after the last finishing stand F7, which are identified in FIG. 1 as T T, and T respectively.
- the actual temperature represented by T is not employed, instead, as will be noted hereinafter, a computed temperature value is used to represent the strip temperature entering the finishing train at point T and, more particularly, entering the first of the descaling units 1 and 2.
- the descaling units 1, 2 and 4 6 in addition to serving to descale the surfaces of the strip, are also employed to assist in controlling the temperature of the strip during rolling at least with respect to the units 4 6.
- the descaling units 1 and 2 operate together through a single control unit 18 having individual hydraulically operated on-off valves 19.
- the descaling units 4 6, as well as the unit 3, are individually operable through on-off valves 23 receiving through lines 20, except for the unit 3, high pressure coolant from a common main line 24 and operated by hydraulic units 25.
- Each of the units 4 6 are under controls 26, the purpose of which will be explained later in connection with the description of the control system.
- the units 3, 7 9, as noted in the aforesaid article, comprise high volume top headers that have the advantage of applying large volumes of water to effect a rapid cooling, but equally important is the uniformity of their application of the coolant across the strip.
- the bottom headers of the low pressure coolant units because of their disposition, in comparison with the top headers, will operate at slightly higher pressures.
- the lines 28 associated with each coolant unit 3, 7 9, while running to the lower headers of the units, are to be understood to represent the piping for the entire unit. The same is true for the lines 20 for the high pressure units.
- the lines 28 of the units 7 and 8 run to onoff valves 30 operated by controls 31, the unit 32 shown associated with the valves representing sumps.
- the valves 30 are individually controlled by flow control valves 33, receiving water from a common line 36, which also feeds the unit 3.
- the valves 33 are controlled by operational amplifiers 37 which, in addition to receiving a control signal, receives a flow error signal from the line 36.
- the unit 9 is controlled in somewhat a different fashion since its primary function is to serve as a vernier control for the delivered strip temperature. Accordingly, it is provided with a flow control valve 38 operated by a control 39, the line 28 receiving water from the line 36.
- the valve 38 is, in return, controlled by an operational amplifier 42 which receives a flow error signal from the line 36 as well as a signal from an operational amplifier 43 which receives a preset signal employed to enable the valve 38 to operate near the midpoint of its total range.
- a feed-forward signal is received from computer to amplifier 43 over line 45.
- the amplifier 43 also receives a signal over a line 44.
- control circuit 47 includes an analog computer 49 designed to develop a signal representing a computed value for the temperature of the strip as it enters the finishing train 10, and more particularly at point T, of FIG. 1.
- the value may, dependent on development of reliable instrumentation, be obtained directly from a pyrometer located at the point T, which would eliminate the need for computer 49.
- the computer 49 receives five electrical signals, the legends representing the following:
- the computer 49 will calculate the temperature of the strip at point T, which temperature is identified as cTl and which will involve employment of well-known fundamental laws of heat transfer involving conduction, radiation and convection.
- cTl temperature is identified as cTl and which will involve employment of well-known fundamental laws of heat transfer involving conduction, radiation and convection.
- a discussion of such laws along with the principles of thermal equivalent of rolling energy as particularly applied to the finishing train of a hot strip mill can be found in many sources for example, an article entitled STRIP TEMPERATURE ANALYSIS IN HOT MILLS by P. C. Thompson et al published in IRON AND STEEL ENGINEER, June 1966, pp. 129 143.
- the computer 49 sends its signal cTl of the computed value of the temperature at T, to a digital memory unit 50, which in addition receives an electrical signal from a timer 5].
- the signal of the computer 49 actually will take the form of a series of discrete signals corresponding to calculated discrete temperatures of succeeding portions of the strip as it passes point T
- the longitudinal temperature profile of the strip will decrease from the front of the strip to its back so that for various portions of the strip, represented by the letters A to E on the memory unit 50, there normally will be a like number of new computed values for cTl.
- the function of the timer 51 will be to assure the proper coordination of the various portions of the strip A E to the distinct signals cTl.
- a switch unit 53 Associated with the memory unit 50 is a switch unit 53, the operation of which is controlled by an operational amplifier timer unit 54 that receives a pass time of the coolant the feed-forward circuit 47, and also commences operation of the vernier control unit 9.
- the signal employed to trigger the operation of switch 53 could be produced by other well-known means and that such means as well as the load cell 29 could be associated with one of the earlier stands F l F4.
- the particular cTl signal from the memory unit 50 for particular strip portions A E is received by a second analog computer 60 designed to develop a computed signal of .the temperature of the strip at point T This signal since it is computed is identified as cT2 in counter-distinction to T which represents the actual temperature of the strip as it leaves the finishing train 10.
- the computer 60 re ceives in addition to the signal cTl five other signals, namely:
- the computer 60 computes a series of discrete signals representing temperatures along the strip at point T2, which signals, identified in legend cT2, are sent to an operational amplifier 61 which also receives a signal representing the desired or aim temperature, identified as T AIM, which is compared with the signal cT2 to produce, if any difference exists, an error signal, legend cT ERR.
- the error signal is sent to an amplifier 62 to effect a progressive and cumulative selection of the cooling units 3 8 dependent upon the required rate of flow necessary to reduce the error signal cT ERR to a desired value, such as, zero.
- the six lines from the amplifier 62 to the controls 26 and amplifiers 37 of the various cooling units 3 -8 have associated therewith legends 1V, 2V, 3V, 4V, 5 8V and 9 12V, respectively. These legends refer to the strength or largeness of the error signal cT ERR., so that if the signal is only one volt, that is, IV, the unit 3 is the only coolant unit put into operation in addition to the units 1 and 2 which are always on. If the error signal is of a strength of 4V, the units 3 6 will all be operated and in case of a still larger error signal 9 12V, all six of the coolant units 3 8 will come into play.'The computer 60 also sends a signal over the line 45 to initiate operation of the coolant unit 9. I
- control circuit 48 it is operated to provide a vernier control for the delivered strip temperature and to effect a recalibration of the value cT2 if the last cooling unit 9 cannot correct for any small differences between the actual strip temperature at point T and the desired or aim temperature at this point.
- the circuit 47 serves as a feed-forward control with respect to point T2.
- the control circuit 48 serves primarily to adjust the variable flow of the coolant unit 9 and for which reason there is provided an operational amplifier 65 which receives a signal fromthe pyrometer arranged at point T2 over line 66 representative of the actual temperature of the strip issuing from the finishing train- 10.
- the amplifier 65 produces a T ERR. signal which is sent to the amplifier 43 and, hence, to the amplifier 42.
- the signal, from the amplifier 65, is compared in amplifier 43 with a signal represneting the mid-range point of the total cooling capacity of the unit 9 and the amplifier 42 compares the signal with a flow error signal on line 36.
- the signal is sent from the amplifier 42 to the control 39 to regulate the valve 38 to increase or decrease its flow rate, depending upon the error signal T ERR.
- Flow rate of coolant will be varied to reduce the error signal to a desired value, such as, a zero value. This flow rate adjustment will also be used in the operation of the coolant units 3, 7 and 8.
- the T ERR. signal from amplifier 65 is also sent to an amplifier 68, designated in FIG. 1 by the legend HI-LO limiter, suggestive of its function to assure that the T signal will be kept within the range of the coolant capacity of the coolant unit 9 so that it will be able to increase or decrease the coolant effect in serving as a vernier control.
- a signal from the amplifier 68 is sent over line 69 to the computer 60 as a AT signal, which is also legended as an Adaptive Feed-back signal.
- This signal will service under the above-stated conditions to override the computer signal cT2 and bring about a correction through altered operation of the feed-forward system.
- Two circumstances that would bring into play this readjustment to prevent the overriding of the range ofa coolant unit 9 is the incorrect selection of the optimum rolling speed or the fact that one or more of the preceding cooling units failed to turn on.
- the strip on the delay table 11 measures 1.26 inches in thickness X 54.3 inches in width and 270 feet in length.
- the temperature at the head end of the strip, let it be assumed is l,86l F and that of the tail end is l,828 F at point T1.
- the temperature AIM of the strip for point T is 1,600 F where it will have a finished rolled thickness of 0.080 inch, the threading speed will be 2,000
- the computer 49 will produce a computed temperature signal CT] for the strip at the entry side of the finishing train at a point T, and at a constant velocity V
- the load cell 29 will initiate operation of the computer 60-which will then compute the temperature cT2 of the strip at the finishing end of the train at point T2, which signal will be compared in the amplifier 61 with the temperature aim signal for the finishing train (T aim), and as explained heretofore, depending upon the degree or amount of the error signal cT, ERR., one or more of the cooling units 3 8 will be operated.
- the first unit to be operated will be unit 3 and if its cooling effect is not sufficient to bring about the required correction, then unit 4 will be operated, and so on. Should the cooling units 7 and 8 be required, as noted before, they each have a variable rate of adjustment of their rate of fiow and the range of the unit 7 will be exhausted before the unit 8 is brought into play.
- the computer 60 will also effect operation of the coolant unit 9 which will be set at the midway point of its total range of coolant capacity. As noted, a series of new calculations of the finishing temperature cT2 are successively computed for the strip entering the mill by the computer 60 so that the amplifier 62 will initiate the required cumulative rate of flow dependent upon the longitudinal temperature profile of the strip entering the mill.
- the amplifier 65 While this temperature control feedforward operation is occurring, the amplifier 65 will continually compare the actual temperature of the strip at T with the temperature aim T at this point and should any difference be determined, which variation, if any, should normally be small, the amplifier 65 will set the required rate of flow of the coolant unit 9 to, in turn, bring about a vernier or fine control of the temperature of the strip leaving the finishing train. Once the threading operation is completed, the finishing train will be rapidly accelerated to the desired and preselected optimum rolling speed. As noted before, in order to obtain maximum production, this acceleration can be as rapid as the drives will allow and, preferably, of the order of 500 ft./min./sec. or higher.
- the interstand coolant control will continue to operate, as explained during the threading operation, except that the succeeding computed values for the signals for the entry temperature of the strip cTl and finishing temperature cT2 will also reflect the changes in velocities V and V during the accelerating period, the selected constant optimum rolling speed, and the deceleration period. In some cases the back end of the strip may require less coolant and on other occasions may require more, the selected top strip operating speed being the important determinant.
- the front end cooling units 1, 2 and 3 and 9 were operated, for the back end all of the remaining units, i.e., 4 8, were employed to give a substantial constant temperature at point T2 and which was less than 25 F above the aim temperature. This difference was then reduced .to the aim temperature by adjustment of the rate of flow of the coolant unit 9.
- FIG. 2 illustrates a second embodiment of the present invention. Since it primarily has to do with the bringing under the control of the feed-back control circuit 48, one or more of the cooling units preceding the unit 9, it involves only a slight change to the feed-forward circuit 47, namely, the elimination of the adaptive feedback signal and AT signal along with the I-II-LO limiter amplifier 68 of the feed-backward circuit 48a.
- the computed signal cT2 produced by the computer 60 is not modified by a signal from the amplifier 65 when more coolant is required than the vernier control unit 9 can produce, instead the preceding units, i.e., 8 etc., are selectively called upon to make the necessary correction for the temperature variation as part of the feed-backward control phase.
- FIG. 2 indicates only the last four stands F4a and F7a and coolant units 6a and 9a. Also illustrated there is an X-ray unit 16a and a runout table 17a. The temperature T is still sent to an amplifier 65a and compared with a T aim signal.
- the amplifier 65a generates, depending upon the magnitude of the difference or error signal, four control signals indicated on lines 44a, 45a, 46a and 47a. These lines take the place of the line 44 and the lines legended 4V, 5 8V and 9 12V of the FIG. 1 embodiment.
- the signals operate in generally the same manner as the similar signals of the first embodiment, but in this case in a total feed-back procedure. Small errors between the actual and aim temperatures are taken care of by the coolant unit 9a which still functions as a vernier control and which is turned on by the computer 60, as explained before.
- the second signal from the amplifier brings into operation cooling unit 8a with the amplifier 43a resetting the rate of flow of the cooling unit 9a to keep it operating at the mean position of its rate of flow range in order that it may continually be employed as a vernier control.
- the coolant units 6a and 7a are similarly brought into operation. While the feed-back system 48a is being operated, the feedforward system of the control circuit 47 will continue to compute the cT2 signal for the portions of the strip A E and continue to control the selection and rate flow of the coolant units 3 5, as previously explained.
- a control system for a rolling mill adapted to reduce the thickness of a hot workpiece comprising:
- first means arranged between a number of earlier stands of said mill for supplying coolant medium to said workpiece while it is being rolled
- said first means comprising high pressure coolant means arranged between the first and next adjacent stand of said mill and a low pressure coolant means arranged between two succeeding stands and said second means comprising a low pressure coolan means
- control means includes means for computing the temperature of the workpiece at a first point located after the last stand and producing a first signal representative thereof
- a control system for a rolling mill adapted to reduce the thickness of a hot workpiece comprising:
- first means arranged between a number of earlier stands of said mill for supplying coolant medium to said workpiece while it is being rolled
- means for controlling the rate of flow of said coolant medium including means for selectively operating said second coolant medium supply means progressively and cumulatively starting with said coolant supply means located between the last adjacent stands of said mill,
- control means includes means for computing the temperature of the workpiece at a first point located after the last stand and producing a first signal representative thereof
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Abstract
Description
Claims (2)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US23122172A | 1972-03-02 | 1972-03-02 |
Publications (1)
Publication Number | Publication Date |
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US3779054A true US3779054A (en) | 1973-12-18 |
Family
ID=22868260
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US00231221A Expired - Lifetime US3779054A (en) | 1972-03-02 | 1972-03-02 | Coolant control for hot strip mill |
Country Status (7)
Country | Link |
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US (1) | US3779054A (en) |
JP (1) | JPS5223613B2 (en) |
CA (1) | CA985768A (en) |
DE (1) | DE2310116A1 (en) |
ES (1) | ES412271A1 (en) |
FR (1) | FR2174266B1 (en) |
GB (1) | GB1421997A (en) |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3905216A (en) * | 1973-12-11 | 1975-09-16 | Gen Electric | Strip temperature control system |
US4047985A (en) * | 1976-02-09 | 1977-09-13 | Wean United, Inc. | Method and apparatus for symmetrically cooling heated workpieces |
US4274273A (en) * | 1979-10-03 | 1981-06-23 | General Electric Company | Temperature control in hot strip mill |
US4280857A (en) * | 1979-11-05 | 1981-07-28 | Aluminum Company Of America | Continuous draw anneal system |
US4296919A (en) * | 1980-08-13 | 1981-10-27 | Nippon Steel Corporation | Apparatus for continuously producing a high strength dual-phase steel strip or sheet |
US4379396A (en) * | 1979-08-14 | 1983-04-12 | Davy-Loewy Limited | Operation of a multi-stand hot rolling mill |
DE3301631A1 (en) * | 1982-01-19 | 1983-07-28 | Mitsubishi Denki K.K., Tokyo | APPARATUS FOR CONTROLLING THE ROD TEMPERATURE IN A CONTINUOUS ROLLING MILL |
US4440583A (en) * | 1982-01-11 | 1984-04-03 | Nippon Steel Corporation | Method of controlled cooling for steel strip |
US4617815A (en) * | 1984-12-24 | 1986-10-21 | Wean United, Inc. | Apparatus for descaling hot strip in a rolling mill |
US4899547A (en) * | 1988-12-30 | 1990-02-13 | Even Flow Products, Inc. | Hot strip mill cooling system |
US5235840A (en) * | 1991-12-23 | 1993-08-17 | Hot Rolling Consultants, Ltd. | Process to control scale growth and minimize roll wear |
US5661884A (en) * | 1996-02-20 | 1997-09-02 | Tippins Incorporated | Offset high-pressure water descaling system |
US5666842A (en) * | 1993-07-22 | 1997-09-16 | Kawasaki Steel Corporation | Method of cold rolling grain-oriented silicon steel sheet having excellent and uniform magnetic characteristics along rolling direction of coil and a roll cooling controller for cold rolling mill using the cold rolling method |
US20040069034A1 (en) * | 2001-03-03 | 2004-04-15 | Jurgen Seidel | Method for removing scale from strips |
US20040205951A1 (en) * | 2001-11-15 | 2004-10-21 | Matthias Kurz | Control method for a finishing train, arranged upstream of a cooling section, for rolling hot metal strip |
US20100218578A1 (en) * | 2007-01-30 | 2010-09-02 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Temperature control device for hot rolling mill |
US20110146706A1 (en) * | 2007-08-21 | 2011-06-23 | Arcelor Mittal France | Economic secondary descaling |
US20110162424A1 (en) * | 2008-08-18 | 2011-07-07 | Sms Siemag Aktiengesellschaft | Method and apparatus for cooling and drying a hot-rolled strip or a metal sheet in a rolling mill |
CN103464474A (en) * | 2013-08-12 | 2013-12-25 | 北京首钢自动化信息技术有限公司 | Automatic temperature control method for rod material cold control system |
CN104785555A (en) * | 2015-05-04 | 2015-07-22 | 中冶南方工程技术有限公司 | Superstrong cooling device |
CN105013841A (en) * | 2015-07-22 | 2015-11-04 | 中冶南方工程技术有限公司 | Strip steel cooling system |
US20180021825A1 (en) * | 2015-02-09 | 2018-01-25 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Descaling system, control device of the descaling system, and method for controlling the descaling system |
US11033942B2 (en) * | 2016-08-09 | 2021-06-15 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Rolling mill exit side temperature control system |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US4527408A (en) * | 1983-10-31 | 1985-07-09 | Morgan Construction Company | Method and Apparatus for cooling and handling hot rolled steel rod in direct sequence with a high speed rolling operation |
GB2163985B (en) * | 1984-09-03 | 1987-09-03 | Davy Mckee | Temperature control of hot strip mill |
JP3784948B2 (en) * | 1997-12-05 | 2006-06-14 | 三菱重工業株式会社 | Method and apparatus for suppressing surface oxide film during hot finish rolling |
JP2000246325A (en) * | 1999-02-24 | 2000-09-12 | Mitsubishi Heavy Ind Ltd | Device and method for preventing scale flaw at hot rolling |
CN101972782B (en) * | 2010-09-15 | 2012-06-06 | 北京科技大学 | Device and method for cooling intermediate rolled blank of hot rolled strip |
CN102764760A (en) * | 2012-07-03 | 2012-11-07 | 南京钢铁股份有限公司 | Method for manufacturing high surface quality hot-rolled steel plate |
CN110064667B (en) * | 2019-04-12 | 2021-03-23 | 首钢京唐钢铁联合有限责任公司 | Laminar cooling method for steel plate |
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-
1972
- 1972-03-02 US US00231221A patent/US3779054A/en not_active Expired - Lifetime
-
1973
- 1973-02-01 GB GB512273A patent/GB1421997A/en not_active Expired
- 1973-02-28 CA CA165,484A patent/CA985768A/en not_active Expired
- 1973-03-01 DE DE19732310116 patent/DE2310116A1/en active Pending
- 1973-03-02 JP JP48024418A patent/JPS5223613B2/ja not_active Expired
- 1973-03-02 ES ES412271A patent/ES412271A1/en not_active Expired
- 1973-03-02 FR FR7307445A patent/FR2174266B1/fr not_active Expired
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Cited By (30)
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US3905216A (en) * | 1973-12-11 | 1975-09-16 | Gen Electric | Strip temperature control system |
US4047985A (en) * | 1976-02-09 | 1977-09-13 | Wean United, Inc. | Method and apparatus for symmetrically cooling heated workpieces |
US4379396A (en) * | 1979-08-14 | 1983-04-12 | Davy-Loewy Limited | Operation of a multi-stand hot rolling mill |
US4274273A (en) * | 1979-10-03 | 1981-06-23 | General Electric Company | Temperature control in hot strip mill |
US4280857A (en) * | 1979-11-05 | 1981-07-28 | Aluminum Company Of America | Continuous draw anneal system |
US4296919A (en) * | 1980-08-13 | 1981-10-27 | Nippon Steel Corporation | Apparatus for continuously producing a high strength dual-phase steel strip or sheet |
US4440583A (en) * | 1982-01-11 | 1984-04-03 | Nippon Steel Corporation | Method of controlled cooling for steel strip |
DE3301631A1 (en) * | 1982-01-19 | 1983-07-28 | Mitsubishi Denki K.K., Tokyo | APPARATUS FOR CONTROLLING THE ROD TEMPERATURE IN A CONTINUOUS ROLLING MILL |
US4617815A (en) * | 1984-12-24 | 1986-10-21 | Wean United, Inc. | Apparatus for descaling hot strip in a rolling mill |
US4899547A (en) * | 1988-12-30 | 1990-02-13 | Even Flow Products, Inc. | Hot strip mill cooling system |
US5235840A (en) * | 1991-12-23 | 1993-08-17 | Hot Rolling Consultants, Ltd. | Process to control scale growth and minimize roll wear |
US5666842A (en) * | 1993-07-22 | 1997-09-16 | Kawasaki Steel Corporation | Method of cold rolling grain-oriented silicon steel sheet having excellent and uniform magnetic characteristics along rolling direction of coil and a roll cooling controller for cold rolling mill using the cold rolling method |
US5661884A (en) * | 1996-02-20 | 1997-09-02 | Tippins Incorporated | Offset high-pressure water descaling system |
US20040069034A1 (en) * | 2001-03-03 | 2004-04-15 | Jurgen Seidel | Method for removing scale from strips |
US7181943B2 (en) * | 2001-03-03 | 2007-02-27 | Sms Demag Aktiengesellschaft | Descaling method for strip-rolling mill |
US20040205951A1 (en) * | 2001-11-15 | 2004-10-21 | Matthias Kurz | Control method for a finishing train, arranged upstream of a cooling section, for rolling hot metal strip |
US7197802B2 (en) * | 2001-11-15 | 2007-04-03 | Siemens Aktiengesellschaft | Control method for a finishing train and a finishing train |
US20100218578A1 (en) * | 2007-01-30 | 2010-09-02 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Temperature control device for hot rolling mill |
US7926316B2 (en) * | 2007-01-30 | 2011-04-19 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Temperature control device for hot rolling mill |
US20110146706A1 (en) * | 2007-08-21 | 2011-06-23 | Arcelor Mittal France | Economic secondary descaling |
US10378115B2 (en) | 2007-08-21 | 2019-08-13 | Arcelormittal France | Economic secondary descaling |
US9358598B2 (en) * | 2008-08-18 | 2016-06-07 | Sms Group Gmbh | Method and apparatus for cooling and drying a hot-rolled strip or a metal sheet in a rolling mill |
US20110162424A1 (en) * | 2008-08-18 | 2011-07-07 | Sms Siemag Aktiengesellschaft | Method and apparatus for cooling and drying a hot-rolled strip or a metal sheet in a rolling mill |
CN103464474B (en) * | 2013-08-12 | 2015-07-29 | 北京首钢自动化信息技术有限公司 | The temperature automatic control method of bar control cooling system |
CN103464474A (en) * | 2013-08-12 | 2013-12-25 | 北京首钢自动化信息技术有限公司 | Automatic temperature control method for rod material cold control system |
US20180021825A1 (en) * | 2015-02-09 | 2018-01-25 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Descaling system, control device of the descaling system, and method for controlling the descaling system |
US10695810B2 (en) * | 2015-02-09 | 2020-06-30 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Descaling system, control device of the descaling system, and method for controlling the descaling system |
CN104785555A (en) * | 2015-05-04 | 2015-07-22 | 中冶南方工程技术有限公司 | Superstrong cooling device |
CN105013841A (en) * | 2015-07-22 | 2015-11-04 | 中冶南方工程技术有限公司 | Strip steel cooling system |
US11033942B2 (en) * | 2016-08-09 | 2021-06-15 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Rolling mill exit side temperature control system |
Also Published As
Publication number | Publication date |
---|---|
FR2174266B1 (en) | 1977-09-02 |
CA985768A (en) | 1976-03-16 |
FR2174266A1 (en) | 1973-10-12 |
ES412271A1 (en) | 1976-01-01 |
DE2310116A1 (en) | 1973-09-06 |
JPS5223613B2 (en) | 1977-06-25 |
GB1421997A (en) | 1976-01-21 |
JPS48101345A (en) | 1973-12-20 |
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