EP2554284B1 - Walzung von metallstreifen - Google Patents

Walzung von metallstreifen Download PDF

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Publication number
EP2554284B1
EP2554284B1 EP11762311.6A EP11762311A EP2554284B1 EP 2554284 B1 EP2554284 B1 EP 2554284B1 EP 11762311 A EP11762311 A EP 11762311A EP 2554284 B1 EP2554284 B1 EP 2554284B1
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EP
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Prior art keywords
rolling
force
decrease
roll
bending force
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EP11762311.6A
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English (en)
French (fr)
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EP2554284A1 (de
EP2554284A4 (de
Inventor
Shigeru Ogawa
Tsuyoshi Higo
Kunihiko Wakatsuki
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Nippon Steel Corp
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Nippon Steel and Sumitomo Metal Corp
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Publication of EP2554284A4 publication Critical patent/EP2554284A4/de
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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
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/38—Control of flatness or profile during rolling of strip, sheets or plates using roll bending
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B29/00—Counter-pressure devices acting on rolls to inhibit deflection of same under load, e.g. backing rolls ; Roll bending devices, e.g. hydraulic actuators acting on roll shaft ends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls

Definitions

  • the present invention relates to a rolling mill of a metal flat-rolled product which has a high response and can impart a powerful roll bending force.
  • it relates to a rolling method which can provide a high response crown/shape control function even in the case of a multiple-high rolling mill with a response of decrease bending devices lower than a response of increase bending devices, see e.g. JP-A 08215730 .
  • JP 6-55207 A describes a method of continuously rolling a rolled material comprised of steel materials differing in width, thickness, steel type, etc. joined together by using a hot final rolling mill which has a roll bending mechanism and a roll shift mechanism.
  • the speed of change of the roll shift position is extremely slow, so during rolling, the roll shift position is fixed and only the high response roll bending force is used for crown control.
  • the crown/shape control is regulated by the speed of control of the roll bending devices.
  • High response has been desired from roll bending devices since the past.
  • JP 8-215730 A describes that the response of a roll bending device is determined by the secondary piping length of the servo valve (see paragraph [0014] and FIG. 1 ). Therefore, the bending force is controlled by servo valves which control the difference between the increase side and decrease side.
  • these servo valves are provided at the side surfaces of housing posts at a total of four locations of the inlet sides and exit sides of the drive side and work side of the rolling mill housing. The lengths of piping from the servo valves to the hydraulic cylinder are made within 2 meters.
  • the response of a roll bending device is not determined by just the piping length from the servo valve to the hydraulic cylinder.
  • the rolling mill which is shown in FIG. 1 is a four-high rolling mill which is provided with a pair of upper and lower work rolls 1-1 and 1-2 and a pair of upper and lower backup rolls 2-1 and 2-2 which support the same.
  • Increase bending devices 6-1 to 6-4 are built into project blocks 5-1 and 5-2, while decrease bending devices 7-1 to 7-4 are built into upper and lower backup roll chocks 4-1 and 4-2 in this type of rolling mill.
  • the response of the decrease bending devices is slower compared with the response of the increase bending devices.
  • the decrease bending devices cannot be made high in response also because fixed piping cannot be used. That is, the work rolls are more easily worn than backup rolls due to rolling operations, so the rolls have to be periodically replaced.
  • the rolling mill which is shown in FIG. 1 has the increase bending devices built into the project blocks, so there is no need to detach and reattach the hydraulic piping of the increase bending devices each time replacing a roll. It is possible to connect to hydraulic control valves through fixed piping. Due to this, it is possible to employ servo valves for high response hydraulic control. As opposed to this, the decrease bending devices of the rolling mill of FIG.
  • freely detachable hydraulic piping such as flexible piping is the biggest cause for the response of the decrease bending devices becoming lower than the response of the increase bending devices.
  • the decrease bending devices cannot be controlled with a high response, the rolling becomes unstable at the time of application and release of the decrease bending force at the time of the start of rolling and the time of the end of rolling. This causes the product quality to deteriorate and the productivity to fall. That is, the decrease bending force cannot be applied at the time of idling when no rolling load is being applied. For this reason, when starting rolling, it is necessary to quickly apply a decrease bending force. On the other hand, at the time of end of the rolling, it is necessary to quickly return to the roll balance state. Therefore, if changing the roll bending force by control by inferior response decrease bending devices, the predetermined decrease bending force will not be applied at the tip and tail ends of the rolled material and the parts with defective shapes will become longer.
  • a second discovery is that when causing a decrease bending force to act in a rolling mill of the type which is shown in FIG. 1 , it is difficult to quickly change the settings during rolling, so it is not possible to eliminate external factors which fluctuate during rolling such as inlet side thickness of the rolled material and the temperature of the rolled material. This caused a drop in the product quality and yield.
  • the technical problem of the present invention is to provide a rolling method of a metal flat-rolled product which can impart to a rolling mill with a response of the decrease bending devices lower than the response of the increase bending devices a high response crown/shape control function even when making a decrease bending force act.
  • this is a rolling method which changes the roll bending force at the time of the start of rolling and the time of the end of rolling by using the high response increase bending devices in the case of causing a decrease bending force to act as the work roll bending force for the purpose of crown/shape control.
  • the high response increase bending devices can compensate (cover for) the response of the decrease bending devices.
  • the rolling mill which is shown in FIG. 1 is a rolling mill of a structure which employs flexible structure, easily detachable hydraulic piping for the hydraulic piping of the decrease bending devices due to the ease of detachment and reattachment of the piping at the time of roll replacement.
  • this is a rolling mill which has the property that the response of the decrease bending devices has to be lower than the response of the increase bending device.
  • this rolling mill is structured with the increase bending devices provided at the project blocks, so it is possible to provide large capacity increase bending devices at the project blocks and possible to connect to the hydraulic control valves through fixed hydraulic piping, so the rolling mill also has the superior property of enabling high response increase bending devices. For this reason, the above high response roll bending force control becomes possible.
  • the inventors perfected an invention of a method of rolling a metal flat-rolled material which can impart a high response crown/shape control function even in a rolling mill with a response of the decrease bending devices lower than the response of the increase bending devices.
  • the gist is as follows.
  • the rolling method according to the present invention changes the roll bending force at the time of the start of rolling and the time of the end of rolling by using the high response increase bending devices. Therefore, even in a rolling mill in which the response of the decrease bending devices is lower than the response of the increase bending devices due to the employing of flexible structure, freely detachable hydraulic piping for the hydraulic piping of the decrease bending devices due to the ease of detachment and reattachment of piping at the time of roll replacement, the high response increase bending devices can compensate for the response of the decrease bending devices and thereby impart a high response, powerful crown/shape control function.
  • the rolling method according to the present invention it is possible to build in an excellent crown/shape even in the face of external factors which fluctuate during rolling such as inlet side thickness of the rolled material and the temperature of the rolled material and possible to greatly improve the product quality and yield.
  • FIG. 1 is a side view which shows one example of the structure of a rolling mill covered by the present invention.
  • This rolling mill will be explained as an example.
  • the rolling mill which is covered by the present invention is a multiple high rolling mill which is provided with a pair of upper and lower work rolls 1-1 and 1-2 and a pair of upper and lower backup rolls 2-1 and 2-2 which support the work rolls.
  • the rolling mill which is shown in this figure is a four-high rolling mill of the type which is employed for final tandem rolling mills of steel sheet/strip, but the invention is not limited to this. It may also be a six-high rolling mill.
  • upper increase bending devices 6-1 and 6-2 which apply increase bending force to the upper work roll 1-1 and lower increase bending devices 6-3 and 6-4 which apply increase bending force to the lower work roll 1-2 are installed in project blocks 5-1 and 5-2 which project to the inside of the housing 9.
  • the work rolls 1-1 and 1-2 have to be periodically replaced due to the wear caused by rolling operations.
  • the rolling mill of FIG. 1 does not require detachment and reattachment of the hydraulic piping of the increase bending devices with each roll replacement operation.
  • the increase bending devices 6-1 to 6-4 can be connected to respective hydraulic control valves through fixed hydraulic piping. Due to this, it is possible to employ servo valves for high response hydraulic control. Therefore, they can be made high response increase bending devices.
  • the upper decrease bending devices 7-1 and 7-2 which apply the decrease bending force to the upper work roll 1-1 are built into the upper backup roll chock 4-1, while the lower decrease bending devices 7-3 and 7-4 which apply the decrease bending force to the lower work roll 1-2 are built into the lower backup roll chock 4-2.
  • the backup rolls 2-1 and 2-2 as well, while not to the extent of the work rolls, are worn by the rolling operations, so have to be periodically replaced. Due to this, this rolling mill requires detachment and reattachment of the hydraulic piping of decrease bending devices 7-1 to 7-4 at each roll replacement operation. At the time of detachment and reattachment, the possibility of minute foreign matter entering the hydraulic piping becomes high.
  • the decrease bending force cannot be applied at the time of idling when no rolling load is being applied.
  • it is necessary to quickly switch to the decrease bending force at the time of starting rolling from the roll balance state at the time of idling and further to quickly return to the roll balance state at the time of rolling end. Therefore, if changing the roll bending force by control by inferior response decrease bending devices, there is a possibility that the predetermined decrease bending force will not be applied at the tip and tail ends of the rolled material and the parts with defective shapes will become longer.
  • the response of a roll bending device is determined by the length of the secondary piping of the servo valve. That is, by shortening the length of the piping from each servo valve to the hydraulic cylinder to within 2 meters and controlling the pressure difference between the increase side hydraulic pressure and the decrease side hydraulic pressure through the servo valve, it is possible to secure a high response of the bending force.
  • the work rolls and the backup rolls have to be periodically replaced, so it is impractical to make both the increase side and the decrease side fixed hydraulic piping. Therefore, it is not possible to sufficiently raise the response when causing decrease bending to act - the object of the present invention.
  • an "increase bending device” means a hydraulic device which gives a force in a direction increasing the roll gap to a work roll chock.
  • "Increase bending device” is a general term for a device including an actuator comprised of a hydraulic cylinder.
  • an “increase bending device” will, unless otherwise stated, indicate the actuator comprised of a hydraulic cylinder.
  • the force which is applied to a work roll by an increase bending device is referred to as the "increase bending force”.
  • a hydraulic device which gives a force in a direction reducing the roll gap to a work roll chock is a “decrease bending device” and a force applied to a work roll due to this is called a “decrease bending force”.
  • “decrease bending device” is a general term for a device including an actuator comprised of a hydraulic cylinder.
  • “decrease bending device” will, unless otherwise stated, indicate the actuator comprised of a hydraulic cylinder.
  • FIG. 2 is a view which shows one example of the flow of operation of the rolling method according to present invention. More specifically, it is a view which shows the flow of operation of a high response increase bending device and a somewhat lower response decrease bending device compared with that.
  • FIG. 3 shows the changes along with time in the roll bending force etc. accompanying a rolling operation on a single rolled material in the case of following this rolling method.
  • FIG. 3 shows, from the top, the changes along with time in the rolling load, output of an increase bending device, output of a decrease bending device, and the composite force of the same, that is, the work roll bending force. Below, this will be explained based on FIGS. 2 and 3 .
  • the set value F R of the work roll bending force corresponding to the rolled material to be next rolled is calculated and output.
  • F R is calculated as a negative value, that is, a decrease bending force.
  • an increase bending force force in increase direction (direction opening up rolls)
  • a decrease bending force force in decrease direction (direction pressing rolls)
  • both the increase bending force and decrease bending force are made to act and the composite force constituted by the increase side roll bending force corresponding to the roll balance force (F B ) acts on the work roll chock. That is, at the timing of idling before rolling, the increase bending device output is made I B (>0), the decrease bending device output is made D B ( ⁇ 0), and I B +D B acts as the roll balance force F B (>0).
  • the roll balance force F B is determined as the force by which the work roll which is driven by the electric motor and the backup roll which is driven by that roll do not slip even at the time of the idling state.
  • D B should be set by the minimum hydraulic pressure of an extent where the actuator of the decrease bending device does not end up separating from the work roll chock.
  • This may be detected for example by the method of finding the time when the load which is detected by a load cell for measurement of the rolling load of a rolling mill exceeds for example 30% of a rolling load calculated by prediction by calculation of the settings.
  • This value is preferably set between 10 to 30%. This is so that it can be differentiated from fluctuations in the roll balance force and so that the start of rolling can be quickly detected.
  • the roll bending force is returned to the state before the start of rolling, an increase side roll bending force which corresponds to the composite force constituted by the roll balance force is made to act on the work roll chock, and the rolling of the metal flat-rolled material is ended in that state. That is, at the time of rolling end (point c on time axis), the decrease bending device output is left as D S while the fast response increase bending device output is returned from I R to I S . By doing this, the composite force constituted by the work roll bending force can be quickly switched from the decrease bending force F R ( ⁇ 0) to the roll balance force F B (>0).
  • the time of rolling end indicates the point of time of ending the rolling end. This may be detected for example by the method of finding the time when the load which is detected by a load cell for measurement of the rolling load of a rolling mill falls under for example 50% of a value of the measured rolling load during rolling averaged over time. This value can be freely set, but is preferably set to between 50 to 80%. This is so that it can be differentiated from fluctuations in the roll bending force and so that the end of rolling can be quickly detected.
  • the point of time after the elapse of for example 1 to 3 seconds from the time of rolling end is made the timing of work completion d .
  • the increase bending device output is made I B and the decrease bending device output is made D B .
  • the composite force constituted by the work roll bending force is maintained at substantially the roll balance force F B .
  • the roll bending force is changed by using high response increase bending devices. For this reason, even if decrease bending devices with responses lower than the increase bending devices have to be provided, they are compensated for by the high response increase bending devices, so a high response and powerful crown/shape control function can be imparted. Further, even when various factors (outside disturbances) cause the rolling force to change during rolling, quick control to make the high response increase bending devices maintain the optimal work roll bending force is possible.
  • the rolling method according to present invention even when the rolled material entry side thickness or the rolled material temperature or other parameters fluctuate during rolling, a good crown/shape can be built in despite these external disturbances. Due to this, the product quality and yield can be greatly improved.
  • FIG. 4 is a view which shows the changes along with time in the rolling bending force etc. in the case of a low response of the decrease bending device (in particular, in the case of having hydraulic pressure characteristics whereby if the reaction force is withdrawn, the pressure ends up falling).
  • this shows the changes along with time in the roll bending force etc. which accompany a rolling operation on a single rolled material in accordance with the flow of operation of the increase bending device and the decrease bending device which is shown in FIG. 2 . That is, compared with the case of FIGS. 2 and 3 , the example of a case of a slow speed of response of the decrease bending device is shown.
  • FIG. 5 is a view which shows another example of the flow of operation of the rolling method according to the present invention and shows the flow of operation of a high response increase bending device and a decrease bending device with a low response compared with the case of FIGS. 2 and 3 .
  • the rolling method which is shown in FIG. 5 measures the hydraulic pressure in hydraulic piping which leads to a decrease bending device and uses the found decrease bending force, or uses the decrease bending force which is measured by a load cell which is provided at the device, as the basis to control an increase bending devices.
  • the output of the increase bending device is controlled in accordance with the decrease bending force or the hydraulic pressure of the decrease bending device so that before and after rolling, the work roll bending force becomes the roll balance force F B and so that during rolling, the work roll bending force becomes F R .
  • the rest of the control is similar to the rolling method which is shown in FIG. 2 .
  • the rolling method which is shown in FIG. 5 for rolling as shown in FIG. 6 , it is possible to compensate for fluctuations in the output of the decrease bending devices by the increase bending devices and realize high response control of the work roll bending force. Further, even without measuring the decrease bending force during rolling or feedback control by measurement of the hydraulic pressure, it is possible to obtain similar effects by predicting in advance the fluctuations in output of a decrease bending device and setting the output of an increase bending device to compensate for this.
  • FIG. 7 and FIG. 8 are side views which show other examples of the structure of a rolling mill which is covered by the present invention. These rolling mills are improved so as to enable the roll gap to be enlarged by having the rolling direction force which is applied to the barrel of the upper work roll 1-1 received not at the project blocks 5-1 and 5-2, but the housing window 12.
  • the rolling mill which is shown in FIG. 7 is a rolling mill which provides the lower decrease bending devices 7-3 and 7-4 which apply decrease bending force to the lower work roll 1-2 at the lower backup roll chock 4-2.
  • the rolling mill which is shown in FIG. 8 is a rolling mill which provides the lower decrease bending devices 7-3 and 7-4 at special project blocks 5-3 and 5-4 which are positioned below the project blocks 5-1 and 5-2.
  • the rolling method according to the present invention can also be applied to these rolling mills. Due to this, it is possible to build in a good crown/shape even in the face of external factors which fluctuate during rolling such as inlet side thickness of the rolled material and the temperature of the rolled material and possible to greatly improve the product quality and yield.
  • the present invention can be utilized for rolling of steel plate, in particular for reverse rolling mills which require particularly large gaps etc.

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  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Claims (3)

  1. Walzverfahren für ein Flachwalz-Metallerzeugnis, das mit Hilfe eines Walzgerüsts durchgeführt wird, das Biegungszunahmevorrichtungen (6-1, 6-2, 6-3, 6-4), die eine Biegungszunahmekraft erzeugen, und Biegungsabnahmevorrichtungen (7-1, 7-2, 7-3, 7-4) hat, die eine Biegungsabnahmekraft erzeugen, und wobei die Biegungsabnahmevorrichtungen (7-1, 7-2, 7-3, 7-4) ein langsameres Ansprechverhalten verglichen mit den Biegungszunahmevorrichtungen (6-1, 6-2, 6-3, 6-4) haben,
    wobei das Walzverfahren für ein Flachwalz-Metallerzeugnis gekennzeichnet ist durch:
    vor Walzbeginn erfolgendes Veranlassen, dass sowohl eine Biegungszunahmekraft als auch eine Biegungsabnahmekraft wirken, sowie Veranlassen, dass als zusammengesetzte Kraft eine Walzenbiegekraft in Entsprechung zu einer Walzenausbalancierkraft auf Arbeitswalzeneinbaustücke (3-1, 3-2) wirkt;
    anschließend bei Walzbeginn erfolgendes Halten der Biegungsabnahmekraft auf der vorbestimmten Biegungsabnahmekraft im Walzverlauf, während bewirkt wird,
    dass sich die Biegungszunahmekraft ändert, und bewirkt wird, dass die vorbestimmte Arbeitswalzenbiegekraft im Walzverlauf auf die Arbeitswalzeneinbaustücke (3-1, 3-2) als die zusammengesetzte Kraft wirkt;
    während des Walzens erfolgendes Durchführen des Walzens, so dass die vorbestimmte Arbeitswalzenbiegekraft im Walzverlauf durch Regelung der Biegungszunahmekraft beibehalten wird; und
    danach bei Walzende erfolgendes Bewirken, dass sich die Biegungszunahmekraft ändert, Bewirken, dass eine Walzenbiegekraft, die der Walzenausbalancierkraft entspricht, auf die Arbeitswalzeneinbaustücke (3-1, 3-2) als zusammengesetzte Kraft mit der Biegungsabnahmekraft wirkt, und Beenden des Walzens des Flachwalz-Metallerzeugnisses in diesem Zustand.
  2. Walzverfahren für ein Flachwalz-Metallmaterial nach Anspruch 1, dadurch gekennzeichnet, dass es mit Hilfe eines Walzgerüsts durchgeführt wird,
    wobei das Walzgerüst ferner ein Paar aus einer oberen und unteren Arbeitswalze (1-1, 1-2) sowie ein Paar aus einer oberen und unteren Stützwalze (2-1, 2-2) hat, die diese jeweils abstützen,
    einen Aufbau hat, bei dem Zunahmehydraulikzylinder, die die Biegungszunahmevorrichtungen (6-1, 6-2, 6-3, 6-4) für die obere und untere Arbeitswalze (1-1, 1-2) bilden, in Lagerblöcke (5-1, 5-2) eingebaut sind, die zum Inneren des Walzgerüstständers (9) vorstehen, und eine feste Hydraulikleitung mit Hydraulikregelventilen der Zunahmehydraulikzylinder verbunden ist und
    ferner einen Aufbau hat, bei dem Abnahmehydraulikzylinder, die die Biegungsabnahmevorrichtungen (7-1, 7-2) für die obere Arbeitswalze (1-1) bilden, in das obere Stützwalzeneinbaustück (4-1) eingebaut sind und flexibel aufgebaute, frei abbaubare Hydraulikleitungen mit dem Hydraulikregelventilen der Abnahmehydraulikzylinder verbunden sind.
  3. Walzverfahren für ein Flachwalz-Metallmaterial nach Anspruch 2, gekennzeichnet durch Messen eines Hydraulikdrucks innerhalb eines Abnahmehydraulikzylinders oder innerhalb einer Hydraulikleitung, die zum Zylinder führt, und Verwenden des Messwerts als Grundlage, um die Biegungszunahmekraft so zu regeln, dass die Walzenbiegekraft, die auf das Arbeitswalzeneinbaustück (3-1, 3-2) wirkt, einen vorbestimmten Wert annimmt.
EP11762311.6A 2010-03-31 2011-01-12 Walzung von metallstreifen Active EP2554284B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010084054 2010-03-31
PCT/JP2011/050785 WO2011122070A1 (ja) 2010-03-31 2011-01-12 金属板材の圧延方法

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EP2554284A1 EP2554284A1 (de) 2013-02-06
EP2554284A4 EP2554284A4 (de) 2013-12-04
EP2554284B1 true EP2554284B1 (de) 2014-11-19

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EP (1) EP2554284B1 (de)
KR (1) KR101300237B1 (de)
CN (1) CN102834192B (de)
BR (1) BR112012024207A2 (de)
TW (1) TWI401123B (de)
WO (1) WO2011122070A1 (de)

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TWI472382B (zh) * 2012-02-16 2015-02-11 China Steel Corp Calculation method of reduction amount of finish rolling in hot rolling process
TWI455766B (zh) * 2012-02-20 2014-10-11 China Steel Corp 精軋機座之進口冠高的計算方法
JP6152320B2 (ja) * 2013-08-19 2017-06-21 新日鉄住金エンジニアリング株式会社 金属板材の圧延方法及び金属板材の圧延機
CN105414203B (zh) * 2015-12-10 2017-11-03 安徽马钢自动化信息技术有限公司 一种提高光整机hgc液压缸轧制力控制精度的方法
TWI740494B (zh) * 2020-05-12 2021-09-21 中國鋼鐵股份有限公司 軋輥檢驗方法與軋輥檢驗系統

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KR101300237B1 (ko) 2013-08-26
EP2554284A1 (de) 2013-02-06
CN102834192A (zh) 2012-12-19
BR112012024207A2 (pt) 2016-07-05
EP2554284A4 (de) 2013-12-04
TW201139001A (en) 2011-11-16
TWI401123B (zh) 2013-07-11
WO2011122070A1 (ja) 2011-10-06
CN102834192B (zh) 2013-11-27

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