EP0730916A1 - Hot rolling method and apparatus - Google Patents

Hot rolling method and apparatus Download PDF

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Publication number
EP0730916A1
EP0730916A1 EP96103339A EP96103339A EP0730916A1 EP 0730916 A1 EP0730916 A1 EP 0730916A1 EP 96103339 A EP96103339 A EP 96103339A EP 96103339 A EP96103339 A EP 96103339A EP 0730916 A1 EP0730916 A1 EP 0730916A1
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EP
European Patent Office
Prior art keywords
strip
mill
rolling
rolled
rolled strip
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.)
Withdrawn
Application number
EP96103339A
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German (de)
English (en)
French (fr)
Inventor
Kunio Sekiguchi
Yoshiharu Anbe
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Toshiba Corp
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Toshiba Corp
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Publication date
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Publication of EP0730916A1 publication Critical patent/EP0730916A1/en
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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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/24—Automatic variation of thickness according to a predetermined programme
    • B21B37/26—Automatic variation of thickness according to a predetermined programme for obtaining one strip having successive lengths of different constant thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling

Definitions

  • the present invention relates to a hot rolling method and machine for continuously rolling a heated steel plate or sheet.
  • Fig. 6 is a line construction of a prior art hot strip mill for realizing a typical hot rolling method for rolling a heated steel plate.
  • a rolled plate that is, a slab having a thickness of 200 to 260 mm, a width of 600 to 1800 mm and a length of 2 to 20 m can be rolled to a coiled strip having a strip thickness of about 1 to 12 mm.
  • a heating furnace 1 heats a conveyed slab up to about 1100°C, and then extracts the heated slab onto a slab conveying table.
  • the heated and extracted slab is passed through a descaling installation 2 to remove iron oxide formed on the surface of the slab, and then conveyed to a roughing mill 3.
  • the roughing mill 3 is generally composed of a plurality of vertical rolling mill and horizontal rolling mill to roll the slab both in the thickness and width directions.
  • the thickness of the slab can be reduced down to about 40 mm, and then conveyed to a finishing mill 4.
  • the finishing mill 4 is generally composed of horizontal rolling mill of 4 to 6 stands, to roll the thickness of the roughly rolled strip down to 1 to 12 mm.
  • the rolled strip taken out of the finishing mill is cooled to a target coiling temperature by a rolled strip cooling installation 5, and then coiled into a coil by a down coiler 6.
  • the hot strip mill as shown in Fig. 6, the slab is heated, and then the heated slab is rolled for each slab, and then coiled into a coil.
  • Fig. 7 shows another prior art line construction of the hot strip mill for directly rolling slab manufactured by a continuous casing installation, which is disclosed in Magazine "Iron and Steel Engineer", 36 to 41 page, December 1993.
  • a slab with a thickness of 50 mm is manufactured by a continuous casing installation 7.
  • the slab is cut off down to such a length as to provide a predetermined weight by a shear 8 installed on the outgoing side of the continuous casing installation 7, and then conveyed to a tunnel furnace 9.
  • the conveyed slab is heated up to 1080°C to 1150°C by the tunnel furnace 9, and then fed to a rolling mill 10.
  • the rolling mill 10 composed of a plurality of horizontal rolling mill rolls the slab to a predetermined thickness.
  • the rolled strip taken out of the rolling mill is cooled down to a target coiling temperature by a rolled strip cooling installation 5, and then coiled by a down coiler 6 into a coil.
  • this continuous casing installation can manufacture the slab of about 150 tons at once. Therefore, when a coil of about 25 ton is manufactured, the casted slab is cut off into a six slabs, and then rolled. In other words, in the hot strip mill as shown in Fig. 7, even when the continuously casted thin slab is directly rolled, the slab must be divided into a small slab, and after that the slab must be rolled for each slab, and then coiled into a coil for each slab.
  • the hot strip mill as shown in Fig. 6 is provided with such a large production capability as to heat and roll a great amount of slab in sequence.
  • the slab before heated is generally kept at a normal temperature, the slab must be heated up to about 1100°C. Therefore, the energy required to heat the slab by the furnace is huge.
  • the hot strip mill as shown in Fig. 7 since the temperature of slab continuously casted is as high as about 900°C, the energy required to heat the slab through the tunnel furnace is relatively very small, as compared with the case of the hot strip mill as shown in Fig. 6. However, since the production amount is restricted by the continuous casing installation or the production capacity of the rolling mill, the energy required for the hot rolling machine as shown in Fig. 7 is about 1/2 to 1/3 of the energy required for the hot rolling machine as shown in Fig. 6.
  • the so-called plate head threading work is required for each slab.
  • the rolled strip head must be passed through a rolling mill composed of a plurality of stands and then coiled by the down coiler.
  • a top end of the strip rolled by the finishing mill 4 is passed through the rolled plate cooling installation 5, and then reaches the down coiler 6.
  • the rolled strip is conveyed to the down coiler 6 by a conveying force of the finishing mill 4 and a conveying force of a table roller disposed between the finishing mill 4 and the down coiler 6.
  • the rolled strip is only kept restricted on the table rollers by the weight of the rolled strip, there arises such a trouble that the rolled strip is floated away from the table rollers by a wind pressure or a cooling water pressure applied to the lower side of the rolled strip by the rolled strip cooling installation 5, with the result that a corrugation phenomenon occurs in the rolled strip and thereby the rolled plate cannot reach the down coiler.
  • the present intention provides a hot strip mill having at least a continuous casting installation, a rolled plate heating installation, a rolling mill, a strip shear, and a down coiler, all being arranged in sequence, for keeping warm or heating a rolled strip manufactured through the continuous casting installation by the rolled plate heating installation, for rolling the heated rolled plate to a target strip thickness by the rolling mill, for coiling the rolled strip by the down coiler, and for cutting off the coiled rolled strip into a predetermined length by the strip shear, which comprises: a rolled plate length measuring unit for measuring a length beginning from a top end of the rolled plate going out of the rolled plate heating installation, and outputting a timing signal when a strip thickness change point previously determined on the rolled strip reaches the rolling mill; a flying gage change control unit including: a set value calculating section for calculating a roll gap set value and a roll speed set value of the rolling mill; and a rolling mill control section for changing a roll gap
  • the present invention provides a hot strip mill having at least a continuous casting installation, a rolled plate heating installation, a roughing mill, a finishing mill, a strip shear, and a down coiler, all being arranged in sequence and further the roughing and finishing mill being arranged close to each other, for keeping warm or heating a rolled plate manufactured through the continuous casting installation by the rolled plate heating installation, for rolling the heated rolled plate to a bar having a target thickness by the roughing mill and further continuously rolling the rolled bar to a target strip thickness by the finishing mill, for coiling the roiled strip by the down coiler, and for cutting off the coiled rolled strip into a predetermined length by the strip shear, which comprises: a rolled strip length measuring unit for measuring a length beginning from a top end of the rolled strip going out of the rolled strip heating installation, and outputting a timing signal when a plate thickness change point previously determined on the rolled plate reaches the roughing mill; a flying gage change control unit including: a set value
  • the roughing mill comprises a vertical rolling mill for rolling the rolled mill in a width direction thereof, and a horizontal rolling mill for rolling the rolled plate in a thickness direction thereof; said rolled plate length measuring unit measures a length beginning from a top end of the rolled plate going out of the rolled plate heating installation, and further detects a timing at which the previously determined strip thickness change point reaches the vertical rolling mill; and the hot rolling mill further comprises a flying bar width control unit including: a set value calculating section for calculating a roll opening rate set value of the vertical rolling mill in order to change a bar width at the strip thickness change point; and a rolling mill control section for changing a roll opening rate of the vertical rolling mill, under rolling conditions, on the basis of the vertical rolling mill roll opening rate set value calculated by said set value calculating section and in response to the timing outputted by said rolled strip length measuring unit, in order to manufacture a plurality of coils of different strip thicknesses and/or different strip widths continuously from the same rolled
  • the present invention provides a hot rolling method, comprising the steps of: arranging at least a continuous casting installation, a tunnel furnace, a rolling mill, a strip shear, and a down coiler in sequence; keeping warm or heating a single rolled plate manufactured through the continuous casting installation by the tunnel furnace; rolling the rolled plate taken out of the tunnel furnace to a target strip thickness by the rolling mill; coiling the rolled strip by the down coiler; cutting off the rolled strip plural times so that the coiled rolled strip becomes a predetermined length; changing a target strip thickness on the outgoing side of the rolling mill, under rolling conditions, in order to manufacture a plurality of coils of different strip thicknesses from the same rolling plate.
  • the present invention provides a hot rolling method, comprising the steps of: arranging at least a continuous casting installation, a tunnel furnace, a roughing mill, a finishing mill, a strip shear, and a down coiler in sequence, the rough and finish rolling mill being arrange close to each other; keeping warm or heating a single rolled plate manufactured through the continuous casting installation by the tunnel furnace; rolling the rolled plate taken out of the tunnel furnace to a bar having a target thickness by the roughing mill; continuously rolling the bar to a target strip thickness by the finishing mill; coiling the rolled strip by the down coiler; cutting off the rolled strip plural times so that the coiled rolled strip becomes a predetermined length; changing the bar thickness of the roughing mill and/or changing the target strip thickness of the finishing mill, under rolling conditions, in order to manufacture a plurality of coils of different strip thicknesses from the same rolling plate.
  • the productivity of the rolling mill is reduced mainly when a thin coil is required to be rolled.
  • a series of operation such as rolled strip head threading work, acceleration, steady rolling, deceleration, and rolled strip tail-out work are repeatedly performed.
  • the rolling speed V TH i.e., threading speed
  • the rolling speed V OUT i.e., tail-out speed
  • the rolling speed V RUN i.e., running speed
  • the head threading speed V TH is determined as 600 mpm (meter per min); the steady rolling speed V RUN is determined as 1200 mpm; and the tail-out speed V OUT is determined as 900 mpm.
  • the idle time is necessary for the preparation of the succeeding rolling work, when this idle time can be eliminated, it is possible to improve the productivity markedly.
  • the work troubles are concentrated during the head threading operation and the tail-out operation, the thinner the strip thickness is, the more often will occur the trouble. Accordingly, in the prior art hot rolling method as shown in Fig. 7, when the time required for the head threading work and the tail-out work can be reduced in the rolling mill, it is possible to increase the productivity and decrease the energy at the same time, while facilitating the rolling work of a thin sheet less than 1 mm.
  • the rolling mill comprises in particular a flying (during-rolling) gage (strip thickness) change control unit for changing the target strip thickness under rolling conditions.
  • the head threading work and the tail-out work can be reduced markedly, so that the idle time during which no rolling work is performed between two coils can be eliminated.
  • a thin sheet rolling is enabled easily, while satisfying both a low energy consumption and a high productivity, so that a versatile production can be realized.
  • the slab thickness is 50 mm. In this case, however, if this thickness is increased up to 150 mm, the productivity can be simply increased three times. However, when the slab thickness is increased, two rolling machines (rough and finish rolling mill) are required as shown in Fig. 6, due to the relationship between the rolling mill and the thickness reduction capacity.
  • the rough and finish rolling mill are arranged close to each other, in order to shorten the line length, to reduce the equipment cost, and to reduce the bar temperature drop.
  • the slab manufactured by the continuous casting installation is cut off after rolled (without being cut off before rolled) to improve the productivity.
  • the target strip thicknesses are changed, under rolling conditions, in at least one of the roughing mill and the finishing mill. In this case, since the coils of different strip thicknesses can be also manufactured from the same slab, a thin sheet rolling is enabled easily, while satisfying both a low energy consumption and a high productivity, so that a versatile production can be realized.
  • the hot rolling apparatus when considering the flexibility of the production schedules, it is preferable to continuously roll a plurality of coils of different strip widths.
  • the toll opening rate of the vertical rolling mill for constituting the roughing mill is changed, under rolling conditions, in such a way that the bar width can be changed, with the result that it is possible to manufacture a plurality of coils of different strip widths from the same slab. Therefore, the rolling work can be made at a low energy consumption and with a high productivity, so that a versatile production can be realized.
  • a plurality of coils of different strip thicknesses can be manufactured from the same slab, by changing the outgoing side target plate thickness of the rolling mill, under rolling conditions.
  • a plurality of coils of different strip thicknesses can be manufactured from the game slab, by changing the flying (during-rolling) bar thickness of the roughing mill and/or the target strip thickness of the finishing mill, both under rolling conditions.
  • a slab manufactured by the continuous casting installation 7 is fed to a slab heating installation 14 such as a tunnel furnace, without being cut off as with the case of the prior art method as explained with reference to Fig. 7.
  • a slab heating installation 14 such as a tunnel furnace
  • the fed heated slab is rolled to a target strip thickness by the rolling mill 10, cooled down to a predetermined coiling temperature by a rolled strip cooling installation 5, and then coiled into a coil by a down coiler 6.
  • the rolled strip is cut off under rolling by a strip shear 11 installed on the incoming side of the down coiler 6. After having been cut off, the rolled strip existing on the down coiler side is coiled as it is.
  • the rolled strip existing on the rolling mill side is conveyed to another down coiler and then coiled as another coil.
  • Fig. 2 shows a speed pattern of the first embodiment of the rolling mill (shown in Fig. 1) for rolling n-units of coils by use of a single slab.
  • the slab is passed through the rolling mill at a head threading speed V TH , and then accelerated up to a steady rolling (or running) speed V RUN .
  • V TH head threading speed
  • V RUN steady rolling speed
  • the rolling speed is reduced down to a speed V c (e.g., 1000 mpm) at which the rolled strip can be cut off by the strip shear, so that the strip shear can cut off the rolled strip at the boundary between the first and second coils.
  • V c e.g. 1000 mpm
  • the rolling speed is accelerated up to the steady rolling speed V RUN again.
  • this prior art flying strip gage change technique is a method in which a strip thickness control for controlling the strip thickness on the outgoing side of the respective stands and a mass flow control for reducing the mass flow change are both combined with each other.
  • the present invention adopts a flying (during-rolling) gage (strip thickness) changing technique different from the prior art changing technique as follows:
  • Fig. 3 shows a state of strip thickness changes obtained when five coils of different strip thicknesses are manufactured by use of the same slab.
  • Each of the strip thickness change points is each boundary between two coils, which are denoted by GCP1 to GCP4.
  • the slab lengths L1 to L4 between the slab top end and the respective strip thickness change points GCP1 to GCP4 are previously determined according to the production plan.
  • the slab length measuring equipment 25 shown in Fig. 1 measures the slab length after the slab top end is engaged with the first stand of the rolling mill 10, for instance, and further outputs the respective timings at which the respective strip thickness change points GCP1 to GCP4 (as shown in Fig. 3) reach the first stand F1.
  • the respective slab lengths can be obtained by integrating the slab speed with respect to time, and the slab speed can be obtained on the basis of the first stand rolling speed and the first stand backward slip.
  • Table 1a lists the relationship between the roll gap set values and the stands through which the strip thickness change points CPG1 to CPG7 pass; and Table 1b lists the relationship between the roller speed set values and the stands through which the strip thickness change points CPG1 to CPG7 pass; in which S j,i : j-th stand roll gap set value of i-th coil V j,i : j-th stand roll speed set value of i-th coil
  • the roll speed set values of all the stands arranged on the upstream side of the stand at which the strip thickness change point arrives are changed.
  • the roll speed set values of the stand at which the strip thickness change point arrives is set to V kk
  • V ⁇ kk V k , i (1 + ( f k , i ) 1 + f kk (2)
  • V ⁇ jk h k , i +1 , V ⁇ kk , (1 + f kk ) h j , i +1 , (1 + f j , i +1 )
  • F1 to F7 arranged horizontally in the uppermost row denote the numbers of the stands
  • F1 to F7 arranged vertically in the leftmost column denote the stands through which the strip thickness change point pass
  • the set values S 1,i to S 7,i in Table 1a and V 1,i to V 7,i in Table 1b arranged at the second row from above denoted by *F1 in the leftmost column are set values set before the strip thickness change point reaches the F1 stand.
  • a rolling mill driver unit 20 includes a plurality of motors for driving the respective stands for constituting the rolling mill 10 and a speed controller for controlling the respective motor speeds at designated values, respectively.
  • the roll gap control unit 21 provided for the rolling mill 10 controls the roll gaps of the respective stands to the respective designated values.
  • a flying gage change control unit 22 provided for the same rolling mill 10 is composed of a set value calculating section 23 and a rolling mill control section 24.
  • the set value calculating section 23 decides a coil pass schedule of the succeeding rolled coil; that is, the respective stand outgoing side strip thicknesses, the roll gap set values, the roll speed set values as listed in Tables 1a and 1b, and applies the decided coil pass schedule to the rolling mill control section 24.
  • the rolling mill control section 24 tracks the strip thickness change point previously decided on the basis of a predetermined coil length, and applies the set value change rate obtained on the basis of data transferred from the set value calculating section 23, to the rolling mill driving unit 20 and the roll gap control unit 21, at such a timing that the strip thickness change point reaches the respective stand, respectively.
  • the rolling mill driving unit 20 and the roll gap control unit 21 change the roller speed and the roll gap. As described above, the outgoing side strip thickness of the stand is changed from the i-th coil value to the (i+1)-th coil value in sequence. Further, when the strip thickness change point passes through the final stand, the rolling for the (i+1)-th coil ends.
  • a cut-off point is set near the strip thickness change point (e.g., a one-meter behind the strip thickness change point).
  • the rolled strip is cut off, so that the (i+1)-th coil is coiled by a down coiler different from a down coiler for coiling the i-th coil.
  • a strip thickness (gage) change point tracking unit 26 decides the cut-off timing of the strip shear 11. That is, after the strip thickness change point has passed through the rolling mill 10, this tracking unit 26 calculates the strip thickness change point position from the final stand, by integrating the final stand outgoing side rolled strip speed with respect to time.
  • the final stand outgoing side rolled strip speed can be obtained by integrating the final stand outgoing side rolling strip speed can be obtained by a product of the final stand roll speed and the forward slip.
  • the calculated strip thickness change point position is outputted to a strip shear control unit 27.
  • This trip shear control unit 27 detects the arrival of the previously decided cut-off point at the strip shear 11 on the basis of the output of the strip thickness (gage) change point tracking unit 26, and starts the strip shear 11 to cut off the rolled strip.
  • the strip thickness of the first coil is determined relatively thick (e.g., 20 mm). However, it is possible to easily roll a thin strip less than 1 mm, by changing the strip thickness of the rolled strip, under rolling conditions.
  • FIG. 4 A second embodiment of the hot strip mill for realizing the hot rolling method according to the present invention will be described hereinbelow with reference to Fig. 4.
  • the line length is shortened by reducing the distance between the roughing mill and the finishing mill, as shown in Fig. 4 in which the same reference numerals have been retained for similar elements or units having the same functions as with the case of the first embodiment, without repeating the similar description.
  • the slab manufactured by a continuous casing installation 7 is fed to a slab heating installation 14 without being cut off and further, after having been heated to a predetermined slab temperature, conveyed to a roughing mill 12.
  • the roughing mill 12 is composed of a vertical rolling mill for rolling the slab in the width direction and a horizontal rolling mill for rolling the slab in the thickness direction.
  • the roughing mill 12 is used to roll the slab only in one direction, the number of the rolling mill for constituting the roughing mill 12 is determined on the basis of the required rolling capacity. In the case of the mill shown in Fig. 4, since the slab having a thickness of 150 mm is assumed, one vertical rolling mill and two horizontal rolling mill are shown.
  • the slab is rolled by the roughing mill 12 to a predetermined thickness (e.g., 50 mm) and then conveyed to a finishing mill 13. After having been rolled to a target thickness by the finishing mill 13, the slab is cooled by a rolled strip cooling installation 5 down to a predetermined temperature, and after that coiled by a down coiler 6.
  • a predetermined thickness e.g. 50 mm
  • a finishing mill 13 After having been rolled to a target thickness by the finishing mill 13, the slab is cooled by a rolled strip cooling installation 5 down to a predetermined temperature, and after that coiled by a down coiler 6.
  • the rolled strip is cut off by a strip shear 11 installed on the incoming side of the down coiler. Further, the rolled strip on the rolling mill side is conveyed to another down coiler and then coiled.
  • the bar length is considered.
  • the slab manufactured by the continuous casting installation at one time is assumed to be 150 ton in weight, 1000 mm in bar width, and 50 mm in bar thickness, the bar length is about 380 m. Therefore, it is not advantageous from the space standpoint to increase the space between the roughing mill and the finishing mill as long as the bar length, from the installation space. Therefore, in this second embodiment shown in Fig. 4, the roughing mill and the finishing mill are arranged close to each other to such an extent that a space for a crop shear or a scale breaker can be secured. In other words, since the rolled plate can be rolled by both the rough and finishing rolling mill at the same time, it is possible to shorten the production line length and reduce the equipment cost thereof, which is another feature of the present invention.
  • the flying gage (bar-thickness) change function of the roughing mill and the flying gage (strip thickness) change function of the finishing mill are both provided, it is possible to increase the adaptability to various production schedules.
  • a roughing mill driving unit 28 provided for the roughing mill 12 is composed of motors for driving the stands for constituting the roughing mill 12 and a speed control unit for controlling the motor speeds to designated values, respectively.
  • a roughing mill roll gap control unit 29 provided for the roughing mill 12 controls the roll gaps of the horizontal rolling mill for constituting the roughing mill 12 to designated values, respectively.
  • a finishing mill driving unit 30 provided for the finishing mill 13 is composed of motors for driving the stands for constituting the finishing mill 13 and a speed control unit for controlling the motor speeds to designated values, respectively.
  • a finishing mill roll gap control unit 31 provided for the finishing mill 13 controls the roll gaps of the horizontal rolling mill for constituting the finishing mill 13 to designated values, respectively.
  • a flying gage change control unit 33 provided for controlling the roughing mill driving unit 28 and the finishing mill driving unit 30 executes the bar thickness change control by changing the roll gap set values and the roll speed set values of the rough rolling machine 12 and further the target thickness change control by changing the roll gap set values and the roll speed set values of the finishing mill 13.
  • the bar can be rolled at such a state as to extending between the roughing mill and the finishng mill. Therefore, the bar thickness can be changed by the roughing mill 12 under rolling condition, and further the strip thickness can be changed by the finishing mill 13 also under rolling conditions, in the same way as with the case of the first embodiment shown in Fig. 1.
  • a set value calculating section 34 for constituting a flying gage change control unit 33 calculates the roll gap set values and the roll speed set values for executing the flying gage change (similar to the set values as listed in Tables 1a and 1b) on the basis such a consideration that the roughing and finishing mills constitute one rolling mill.
  • the calculated set values are outputted to a rolling mill control section 35.
  • a slab length measuring unit 36 measures the slab length, immediately after the top end of the slab is engaged with the first horizontal rolling mill for constituting the roughing mill 12, to detect a timing at which a slab thickness change point reaches the first horizontal rolling mill. The detected timing signal is outputted to the rolling mill control section 35.
  • the rolling mill control section 35 gives the set value change command decided on the basis of the set values of the set value calculating section 34, to the roughing mill driving unit 28 and the roughing mill roll gap control unit 29, in order to change the roll gap set value and the roll speed set value of the first stand. Further, at the timings when the strip thickness change point reaches another stand of the roughing mill and the respective stands of the finishing mill 13, the rolling mill control section 35 outputs the set value change commands to the rough rolling machine driving unit 28, the roughing mill roll gap control unit 29, the finishing mill driving unit 30 and the finishing mill roll gap control unit 31 respectively, in order to change the roll gap set values and the roll speed set values of the corresponding stands.
  • the strip thickness on the outgoing side of the finishing mill can be changed.
  • the rolled strip is cut off at a predetermined cut-off position by the strip shear 11 on the basis of commands applied by a strip thickness change point tracking unit 26 and a strip shear control unit 27, in the same way as with the case of the first embodiment shown in Fig. 1.
  • the roll opening rate of the vertical rolling mill for constituting the second embodiment shown in Fig. 4 is changed under rolling conditions, in such a way that coils of different strip widths can be produced from the same slab by changing the bar width.
  • the bar width change rate and the roll opening rate change rate of the vertical rolling mill can be calculated on the basis of the well-known rolling theory.
  • a rough strip mill 12 is composed of a vertical rolling mill and two horizontal rolling mill 16 and 17.
  • the vertical rolling mill 15 rolls a slab in the width direction thereof by a pair of vertical rolls.
  • the roll opening rate can be controlled on the basis of a value designated by the vertical rolling mill roll opening rate control unit 37.
  • a flying bar width change control unit 38 provided for controlling a vertical rolling mill roll opening rate control unit 37 is composed of a set value calculating section 39 and a rolling mill control section 40. Further, the set value calculating section 39 calculates a bar width by correcting a target strip width of a coil rolled by the roughing mill at the succeeding stage under due consideration of the width fluctuation rate during rolling by the finishing mill (which can be obtained on the basis of the target mill thickness or the bar thickness), and further calculates the outgoing side width of the vertical rolling mill by correcting the width fluctuation rate during rolling by the horizontal rolling mill 16 and 17. On the basis of the calculated width, the vertical rolling mill opening rate is decided, and the decided opening rate is applied to a rolling mill control section 40.
  • a slab length measuring unit 41 connected to the rolling mill control section 40 starts measuring the slab length at a timing when the slab end is engaged with the vertical rolling mill 15, and transmits a timing signal to the rolling mill control section 40 by detecting a timing when the strip thickness change point reaches the vertical rolling mill 15.
  • the rolling mill controls section 40 transmits a set value change command to a vertical rolling mill roll opening rate control unit 37 on the basis of a vertical rolling mill roll opening rate set value applied by a set value calculating section 39, in order to change the outgoing side slab width of the vertical rolling mill. Therefore, the outgoing side bar width of the roughing mill 12 and the outgoing side strip width of the finishing mill 13 can be both changed under rolling conditions.
  • the slab manufactured by the continuous casting installation can be directly rolled, the consumption rate of heat energy can be reduced. Further, since the coils are manufactured by cutting off the rolled slab, the rolling time can be reduced, with the result that it is possible to attain a high productivity while saving energy.
  • the flying gage (strip thickness) change function and the flying gage (bar thickness) change function are both added to the rolling mill, it is possible to cope with various production schedules, to improve the rolling work efficiency, and to enable a thin strip rolling as thin as less than 1 mm easily.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control Of Metal Rolling (AREA)
EP96103339A 1995-03-03 1996-03-04 Hot rolling method and apparatus Withdrawn EP0730916A1 (en)

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JP44620/95 1995-03-03
JP4462095 1995-03-03

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EP (1) EP0730916A1 (enrdf_load_stackoverflow)
KR (1) KR100216641B1 (enrdf_load_stackoverflow)
CN (1) CN1070393C (enrdf_load_stackoverflow)
TW (1) TW309456B (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999004915A1 (en) * 1997-07-21 1999-02-04 Kvaerner Metals Continuous Casting Limited Continuous metal manufacturing method and apparatus therefor
EP0872288A3 (en) * 1997-04-16 1999-04-07 Danieli United, A division of Danieli Corporation Long slab rolling process and apparatus
WO1999024183A1 (de) * 1997-11-07 1999-05-20 Siemens Aktiengesellschaft Verfahren und einrichtung zum walzen eines walzbandes mit variierender dicke
WO2007010565A1 (en) * 2005-07-19 2007-01-25 Giovanni Arvedi Process and related plant for manufacturing steel long products without interruption
WO2010049280A3 (de) * 2008-10-30 2010-07-15 Siemens Aktiengesellschaft Verfahren zur einstellung einer auslaufdicke eines eine mehrgerüstige walzstrasse durchlaufenden walzguts, steuer- und/oder regeleinrichtung und walzanlage
US8162032B2 (en) 2005-07-19 2012-04-24 Giovanni Arvedi Process and plant for manufacturing steel plates without interruption
CN103071675A (zh) * 2012-12-20 2013-05-01 济钢集团有限公司 一种薄规格中厚钢板轧制系统
RU2537674C2 (ru) * 2010-07-21 2015-01-10 Даниели & К. Оффичине Мекканике Спа Устройство и способ для поддержания температуры и/или возможного нагрева длинномерных металлических изделий
US9138789B2 (en) 2008-10-30 2015-09-22 Siemens Aktiengesellschaft Method for adjusting a drive load for a plurality of drives of a mill train for rolling rolling stock, control and/or regulation device, storage medium, program code and rolling mill
EP2982453A1 (de) * 2014-08-06 2016-02-10 Primetals Technologies Austria GmbH Einstellen eines gezielten Temperaturprofiles an Bandkopf und Bandfuß vor dem Querteilen eines Metallbands
US11167331B2 (en) * 2017-08-04 2021-11-09 Toshiba Mitsubishi-Electric Industrial Systems Corporation Temperature control device for endless rolling line
EP3705198B1 (en) 2017-11-03 2022-06-01 Posco Continuous casting and rolling apparatus and continuous casting and rolling method
EP4087692B1 (en) 2020-01-10 2024-01-31 Danieli & C. Officine Meccaniche S.p.A. Method and apparatus for producing flat metal products

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KR100711411B1 (ko) * 2005-12-26 2007-04-30 주식회사 포스코 열간 압연 장치 및 그 제어방법
KR101500240B1 (ko) * 2013-12-26 2015-03-06 주식회사 포스코 권취 유도 장치 및 이를 구비하는 연연속 압연 설비
CN111495982B (zh) * 2019-01-30 2022-06-24 宝山钢铁股份有限公司 冷连轧机可变厚度自动轧制控制方法
CN111589863A (zh) * 2020-05-28 2020-08-28 天津市宇润德金属制品有限公司 一种用于钢板压薄处理系统

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JPS58181405A (ja) * 1982-04-20 1983-10-24 Nippon Steel Corp 不等厚板材の製造法
JPS61273210A (ja) * 1985-05-27 1986-12-03 Nippon Steel Corp タンデム圧延機の走間スケジユ−ル変更方法
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Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0872288A3 (en) * 1997-04-16 1999-04-07 Danieli United, A division of Danieli Corporation Long slab rolling process and apparatus
WO1999004915A1 (en) * 1997-07-21 1999-02-04 Kvaerner Metals Continuous Casting Limited Continuous metal manufacturing method and apparatus therefor
WO1999024183A1 (de) * 1997-11-07 1999-05-20 Siemens Aktiengesellschaft Verfahren und einrichtung zum walzen eines walzbandes mit variierender dicke
WO2007010565A1 (en) * 2005-07-19 2007-01-25 Giovanni Arvedi Process and related plant for manufacturing steel long products without interruption
US7967056B2 (en) * 2005-07-19 2011-06-28 Giovanni Arvedi Process and related plant for manufacturing steel long products without interruption
US8162032B2 (en) 2005-07-19 2012-04-24 Giovanni Arvedi Process and plant for manufacturing steel plates without interruption
US9314828B2 (en) 2008-10-30 2016-04-19 Siemens Aktiengesellschaft Method for adjusting a discharge thickness of rolling stock that passes through a multi-stand mill train, control and/or regulation device and rolling mill
WO2010049280A3 (de) * 2008-10-30 2010-07-15 Siemens Aktiengesellschaft Verfahren zur einstellung einer auslaufdicke eines eine mehrgerüstige walzstrasse durchlaufenden walzguts, steuer- und/oder regeleinrichtung und walzanlage
RU2477661C2 (ru) * 2008-10-30 2013-03-20 Сименс Акциенгезелльшафт Способ регулирования толщины при выходе раската, который проходит через многоклетьевую линию прокатного стана, разомкнутое и/или замкнутое управляющее устройство и прокатный стан
EP2340133B2 (de) † 2008-10-30 2023-07-19 Primetals Technologies Germany GmbH Verfahren zum einstellen einer antriebslast für eine mehrzahl an antrieben einer walzstrasse zum walzen von walzgut, steuer- und/oder regeleinrichtung, speichermedium, programmcode und walzanlage
CN102271833B (zh) * 2008-10-30 2014-01-29 西门子公司 调节穿过多机架的轧机列的轧制物的出料厚度的方法、控制和/或调节装置和轧制设备
US9138789B2 (en) 2008-10-30 2015-09-22 Siemens Aktiengesellschaft Method for adjusting a drive load for a plurality of drives of a mill train for rolling rolling stock, control and/or regulation device, storage medium, program code and rolling mill
RU2537674C2 (ru) * 2010-07-21 2015-01-10 Даниели & К. Оффичине Мекканике Спа Устройство и способ для поддержания температуры и/или возможного нагрева длинномерных металлических изделий
CN103071675A (zh) * 2012-12-20 2013-05-01 济钢集团有限公司 一种薄规格中厚钢板轧制系统
WO2016020134A1 (de) 2014-08-06 2016-02-11 Primetals Technologies Austria GmbH Einstellen eines gezielten temperaturprofiles an bandkopf und bandfuss vor dem querteilen eines metallbands
EP2982453A1 (de) * 2014-08-06 2016-02-10 Primetals Technologies Austria GmbH Einstellen eines gezielten Temperaturprofiles an Bandkopf und Bandfuß vor dem Querteilen eines Metallbands
CN106536074A (zh) * 2014-08-06 2017-03-22 首要金属科技奥地利有限责任公司 在横切金属带之前调整带头部和带基部处的目标温度分布
RU2679321C2 (ru) * 2014-08-06 2019-02-07 Прайметалз Текнолоджиз Аустриа ГмбХ Установка целевого температурного профиля в головной части полосы и концевой части полосы перед поперечным разделением металлической полосы
US10870139B2 (en) 2014-08-06 2020-12-22 Primetals Technologies Austria GmbH Adjusting a targeted temperature profile at the strip head and strip base prior to cross-cutting a metal strip
US11167331B2 (en) * 2017-08-04 2021-11-09 Toshiba Mitsubishi-Electric Industrial Systems Corporation Temperature control device for endless rolling line
EP3705198B1 (en) 2017-11-03 2022-06-01 Posco Continuous casting and rolling apparatus and continuous casting and rolling method
EP4087692B1 (en) 2020-01-10 2024-01-31 Danieli & C. Officine Meccaniche S.p.A. Method and apparatus for producing flat metal products

Also Published As

Publication number Publication date
KR960033577A (ko) 1996-10-22
TW309456B (enrdf_load_stackoverflow) 1997-07-01
KR100216641B1 (ko) 1999-09-01
CN1070393C (zh) 2001-09-05
CN1137949A (zh) 1996-12-18

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