WO2022263266A1 - Verfahren zum herstellen eines walzguts mit kastenprofil - Google Patents
Verfahren zum herstellen eines walzguts mit kastenprofil Download PDFInfo
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- WO2022263266A1 WO2022263266A1 PCT/EP2022/065629 EP2022065629W WO2022263266A1 WO 2022263266 A1 WO2022263266 A1 WO 2022263266A1 EP 2022065629 W EP2022065629 W EP 2022065629W WO 2022263266 A1 WO2022263266 A1 WO 2022263266A1
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- Prior art keywords
- contour
- rolling
- flat
- control device
- stock
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title description 4
- 238000005096 rolling process Methods 0.000 claims abstract description 267
- 238000000034 method Methods 0.000 claims description 31
- 238000011017 operating method Methods 0.000 claims description 26
- 238000004590 computer program Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 230000006978 adaptation Effects 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008654 plant damage Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2263/00—Shape of product
- B21B2263/04—Flatness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2263/00—Shape of product
- B21B2263/10—Lateral spread defects
Definitions
- the present invention is based on an operating method for a rolling mill comprising a number of roll stands for rolling a flat rolling stock, with a control device for the rolling mill
- the target variables comprising at least one desired profile value of the flat rolled stock which represents the deviation in the thickness of the flat rolled stock at a predetermined distance from the edges of the flat rolled stock characterized by a center thickness which the flat rolled stock has midway between the edges,
- an ideal contour profile of the flat rolling stock is determined over the rolling stock width
- the determined target values are transmitted to the roll stands of the rolling train, so that the flat rolling stock is rolled in the rolling train taking into account the transmitted target values.
- the present invention is also based on a computer program that includes machine code that can be processed by a control device for a rolling train for rolling flat rolling stock, the processing of the machine code by the control device causing the control 20?ooo353
- the present invention is also based on a control device for a rolling train for rolling flat rolling stock, the control device being designed as a software-programmable control device and being programmed with such a computer program so that it operates the rolling train according to such an operating method.
- the present invention is also based on a rolling train for rolling a flat rolling stock
- the rolling train has a number of rolling stands, by means of which the flat rolling stock is rolled,
- Such an operating method is known, for example, from WO 2019/086172 A1.
- the control device can be supplied as target variables, among other things, the contour and/or discrete parameters defining the contour.
- the control device takes the target variables into account when determining the target values.
- Such an operating method is also known from WO 2020/016387 A1 and US Pat. No. 6,158,260.
- the thickness of the flat rolled material varies as viewed in the direction of the width of the flat rolled material.
- the thickness profile can be described by various parameters.
- An important parameter, which is usually specified, is the center thickness dO, which the flat rolling stock has in its center, ie in an area that is equidistant from both edges of the flat rolling stock.
- the distance xx can have any value, but usually has the value 25 mm, the value 40 mm or the value 100 mm.
- a desired profile value C40 of 20 ⁇ m or more is usually specified for hot rolling, so that the strip produced has a convex thickness profile, i.e. a bulbous profile in which the center thickness dO is greater than the thickness at the edges of the flat rolling stock is.
- the guiding properties can be kept stable both in the hot rolling and in the subsequent cold rolling.
- the object of the present invention is to create possi possibilities by means of which box sections can be produced as well as possible, while at the same time the stability of the production process should be ensured.
- an operating method of the type mentioned at the outset is designed in that the control device determines the target values for the manipulated variables using the model in such a way that a contour course expected for the flat rolling stock after the flat rolling stock has been rolled in the rolling mill is exclusively in one across the width of the rolling stock Seen as the initial central area, which extends to the edges of the flat rolled stock up to the initial area limits, which are at a greater distance from the edges of the flat rolled stock than the predetermined distance, the ideal contour is approximated as closely as possible, or the expected one Although the contour is approximated to the ideal contour in addition to the initial central area outside of the initial central area, this is only to the extent that it is possible without impairing the approximation of the expected contour to the ideal contour in the initial central area is.
- the invention is based on the finding that the course of the contour can generally be influenced very well by the actuators in the middle of the flat rolling stock.
- the flat rolling stock is getting worse and worse.
- a drop in thickness is unavoidable in the immediate vicinity of the edges of the flat rolling stock. Therefore, it is possible to mentally divide the flat rolled stock into the initial central portion and two initial outer portions as viewed in the width direction of the flat rolled stock.
- the initial middle range is from -bl/2 to bl/2, where bl is less than b.
- the course of the contour can be influenced well.
- the initial outer regions extend from -b/2 to -bl/2 and from bl/2 to b/2. In the initial outer areas, the course of the contour can only be influenced poorly, so it has to be accepted more or less as it arises.
- the target values te can be determined in such a way that the stated C40 value is reached.
- reaching such a low C40 value can result in the contour becoming locally concave (i.e. the flat rolled stock is thicker in areas 40mm (or slightly more) from the edges of the flat rolled stock). towards the middle of the flat rolled stock, possibly even thicker than in the middle of the flat rolled stock).
- the flat rolling stock forms "humps" at its edges, so to speak. Forcing such a low C40 value can result in the two humps having a significant height.
- the contour can even become globally concave, i.e. from the center of the flat rolling stock to the edges of the flat rolling stock, the thickness of the flat rolling stock increases across the entire rolling stock width, which can easily make the rolling process unstable.
- the control device accepts the initial area limits or the distance between the initial area limits and the edges of the flat rolling stock.
- the default can be followed by an operator, for example.
- a person skilled in the art may know from experience what value to set the initial range limits to, or the distance of the initial range limits from the edges of the flat stock, exactly or at least approximately, for a given flat stock.
- the control device determines the initial area limits or the distance between the initial area limits and the edges of the flat rolling stock using the actual values of the flat rolling stock before the flat rolling stock is rolled in the rolling train and/or the predetermined distance.
- tables or characteristic curves can be stored in the control device, so that the control device is able to determine the appropriate value for a specific flat rolling stock.
- the input variables can be, for example, the chemical composition of the flat rolling stock, its width, its mean thickness before and/or after rolling, its temperature, etc. This procedure has the advantage that the operator is relieved of the sometimes difficult task of determining the corresponding values.
- the control device checks whether the expected contour is convex or not, increases the initial central area in the case of a convex contour or reduces the distances between the initial area boundaries and the edges of the flat rolling stock and vice versa in the case of a non-convex contour the initial central area is reduced or the distances of the initial area limits from the edges of the flat rolling stock are increased.
- the initial mean range can be determined as large as is just about acceptable.
- control device works in a loop that is executed several times. Within a single pass through the loop, the control device evaluates the currently valid initial area limits and determines the associated setpoint values and the associated expected contour profile for these initial area limits. Based on the check, it then increases or decreases the initial middle region and then runs the loop again.
- the loop must not be an endless loop. The repetition of the loop must therefore be terminated when a termination criterion is reached.
- the values then reached for the initial range limits, the associated setpoint values and the associated expected contour profile are then the final values.
- the exact termination criterion is of secondary importance. For example, in the case of a convex contour, the initial region boundaries can be gradually enlarged, but the loop is exited when a concave contour first occurs. In this case, the values for the initial range limits are used as the final values, at where a convex contour was last determined.
- the initial area boundaries can be gradually reduced and the loop can be exited when a convex contour occurs for the first time.
- the values for the initial area limits where a convex contour progression was determined for the first time are used as the final values.
- the termination criterion can also consist in the fact that a predetermined number of runs of the loop has been carried out or that—in relation to the increasing and reducing of the initial area limits—a predetermined number of direction changes has been reached.
- the increment can also be reduced, for example, with each change of direction and the termination criterion can be defined by reaching or falling below a predetermined minimum increment.
- the control device preferably determines the ideal contour profile by determining the coefficients of a polynomial describing the ideal contour profile in such a way that the ideal contour profile matches the target values as well as possible. This results in a simple and reliable determination of the ideal course of the contour. This procedure is particularly advantageous when the desired profile value of the control device is specified directly as such. The match can be determined in particular by minimizing the mean square deviation of the ideal contour from the target variables.
- the polynomial is usually a polynomial that contains only even powers of the location x in the latitude direction.
- it can be a monomial, ie contain only a single power of the location x in the direction of latitude.
- the ideal contour should be defined by a parabola of the 2nd or 4th order.
- control device In a preferred embodiment of the operating method, it is provided that the control device
- a contour function extending at least over a final middle area is determined in such a way that the contour function is as close as possible to the actual course of the contour in the final middle area
- control device determine coefficients of the contour function in order to determine the contour function and then to determine the modeled profile value using the coefficients of the contour function.
- the model is modified immediately or gradually in such a way that despite the determination of the target values due to the approximation of the expected contour to the ideal contour, a flat rolling stock with a concave contour is produced exclusively or at least primarily in the initial central area.
- the control device can, for example, evaluate the determined contour function at the predetermined distance from the edges of the flat rolling stock.
- the value determined in this way can differ from the profile value as it results from the actual course of the contour as such.
- the control device can use an actual profile value at a distance from the edges of the flat rolling stock, which is greater than the predetermined distance, for example for the actual course of the contour.
- the control device can determine a C100 value and use it as a C40 value as part of the model adaptation.
- the last procedure explained relates to the evaluation of the measured variables within the framework of an adaptation of the model from flat rolled stock to flat rolled stock.
- This procedure can be useful, in particular, when rolling a flat rolling stock in the form of a strip.
- the integration into a control loop can take place, for example, in that the control device
- a contour function extending at least over a final middle area is determined in such a way that the contour function is as close as possible to the actual course of the contour in the final middle area
- the target values for the manipulated variables are corrected.
- the actual course of the contour is optimized within one and the same flat rolling stock.
- the control device can check whether the contour function is convex in the final central area or not. In the case of a convex contour function, the control device can enlarge the final central area and, conversely, in the case of a non-convex contour function, reduce the final central area. By doing this, the final central area can be maximized.
- a hysteresis can be provided and/or a procedure can be implemented that is similar to the procedure that was explained above in connection with the determination of the initial central area based on the expected contour profile.
- the control device preferably controls a cooling device, by means of which the work rolls of at least one of the roll stands are cooled as a function of the location across the width of the rolling stock, in such a way that the contour profile expected for the flat rolling stock after the flat rolling stock has been rolled in the rolling mill the initial area limits towards the edges of the flat rolling stock is approximated as closely as possible to the ideal contour.
- This maximizes the width of the flat rolled stock within which the flat rolled stock can be produced within allowable tolerances.
- this determination is only of secondary importance, ie only to the extent that it is possible without impairing the approximation of the expected contour profile to the ideal contour profile in the initial central area.
- the object is also achieved by a computer program with the features of claim 13.
- a computer program with the features of claim 13.
- the processing of the computer program that the control device operates the rolling train according to an operating method according to the invention.
- a control device having the features of claim 14.
- a control device of the type mentioned at the beginning is programmed with a computer program according to the invention, so that the control device operates the rolling train according to an operating method according to the invention.
- control device is designed as a control device according to the invention in a rolling mill of the type mentioned.
- FIG 6 different contours
- FIG 10 different contours
- a rolling train has a number of rolling stands 1 .
- a total of four rolling stands 1 are shown in FIG. 1.
- the rolling train could also have fewer than four rolling stands 1, for example only two or three rolling stands 1. At least a single rolling stand 1 is present.
- the rolling train could also have more than four roll stands 1, for example five, six or seven roll stands 1.
- a flat rolling stock 2 is rolled by means of the roll stands 1 in the rolling train.
- the rolling stock 2 is made of metal, mostly steel, in some cases also made of aluminum, in rare cases made of another metal, for example copper.
- the rolling stock 2 is usually a strip. In individual cases, however, it can also be a heavy plate.
- Flat rolling stock - this also applies to the flat rolling stock 2 - are usually characterized by a plurality of geometric sizes Shen. Insofar as they are relevant in the context of the present invention, these variables are explained in more detail below in connection with FIG.
- An essential geometric variable is the width b of the flat rolling stock 2.
- the width b is usually at least 600 mm, but can also have considerably larger values. In some cases, values of up to 2000 mm and even more are possible.
- the flat rolling stock 2 With respect to a coordinate x, which is directed in the width direction of the flat rolling stock 2, the flat rolling stock 2 extends from -b/2 to +b/2. Strictly speaking, the width b varies from roll pass to roll pass. The width b usually increases from pass to pass. However, the change in width b is very small and can be ignored within the scope of the present invention.
- the flat rolling stock 2 is also characterized by additional geometric variables.
- These variables can be a thickness profile, ie the thickness d as a function of the location x in the width direction.
- they can be variables derived from the thickness profile, in particular the contour c or a desired profile value C.
- the desired profile value C results from the contour c.
- the desired profile value C is a scalar value. It results from the mean value of the contour c at a predetermined distance a from the edges of the flat rolling stock 2:
- the distance a has a small value compared to the width b.
- a distance a of, for example, 25 mm, 40 mm, 50 mm, 75 mm or 100 mm is typical.
- the desired profile value C is usually supplemented by the distance a, so that one speaks of a C25 value, a C40 value, a C50 value, a C75 value or a C100 value.
- the rolling train is controlled by a control device 3 according to FIG.
- the control device 3 is generally designed as a software-programmable control device.
- the control device 3 is programmed with a computer program 4 .
- the computer program 4 includes machine code 5 which can be processed by the control device 3 .
- the processing of the machine code 5 by the control device 3 has the effect that the control device 3 operates the rolling mill according to an operating method which is explained in more detail below--first in connection with FIG.
- the control device 3 first receives actual variables I of the flat rolling stock 2 in a step S1.
- the actual variables I describe actual properties of the flat rolling stock 2, which the flat rolling stock 2 has before rolling in the rolling train.
- the actual variables I can, for example, be the width b, the center thickness dO, the temperature, the chemical composition and other actual variables of the flat rolling stock 2.
- the actual variables I can be measured values. Alternatively, it can be arithmetically determined values that are determined on the basis of processing steps to which the flat rolling stock 2 is subjected before rolling in the rolling train. Mixed forms are also possible, ie a part of the actual variables I is measured and another part of the actual variables I is calculated.
- control device 3 receives target values Z of the flat rolling stock 2 in a step S2.
- the target variables Z describe properties of the flat rolling stock 2 which the flat rolling stock 2 should have after rolling in the rolling train—ie after the last rolling pass to be carried out in the rolling train.
- the target variables Z include directly or indirectly at least the desired profile value C.
- the desired profile value C is referenced to the distance a.
- a C25 value or a C40 value is specified as the desired profile value C.
- the target variables Z include other variables, for example the center thickness dO and the temperature. In the context of the present invention, however, only the desired profile value C (including the associated distance a) is important. It is possible for the desired profile value C to be specified directly as target variable Z. Alternatively, it is possible for the desired profile value C to be specified indirectly.
- the contour c can be specified as the target variable Z, so that the desired profile value C results from the value of the contour c at the predetermined distance a from the edges of the flat rolling stock 2 . It is also possible for the thickness d to be specified via the rolling stock width b, so that the control device 3 determines the contour c from the progression of the thickness d and determines the desired profile value C from the contour c.
- step S3 the control device 3 determines an ideal contour ci of the flat rolling stock 2.
- the ideal contour ci is a function of the location x.
- the control device 3 determines the ideal contour profile ci, i.e. over the width b of the flat rolling stock 2.
- the determination is based on the target values Z, in such a way that a standard based on the deviation of the contour profile ci from the target values Z is minimized.
- the target variables Z are taken into account in step S3. If - purely by way of example - the target variables include the temperature, the center thickness dO and the desired profile value C, only the desired profile value C has to be taken into account to determine the ideal contour curve ci.
- the procedure of step S3 is generally known and familiar to those skilled in the art.
- control device 3 can determine the ideal contour profile ci by determining the coefficients of a polynomial that describes the ideal contour profile ci. In this case, the determination is made in such a way that the ideal contour curve ci—as defined by the coefficients—matches the target variables Z as well as possible.
- the polynomial is usually a monomial. So it will be through one fully described with a single coefficient for a single power.
- the ideal contour curve ci is described by a parabola of the 2nd, 4th, 6th, etc. degree, the degree of the control device 3 being specified and only the coefficient being determined by the control device 3 .
- other values are also important, for example values that are defined similarly to the desired profile value C but are based on greater distances than the distance a for the desired profile value C
- the polynomial can alternatively be a monomial or a "real" polynomial, i.e. a polynomial in which more than just a single coefficient can be different from 0. In this case too, however, the possible degrees of the control device 3 are specified. Only the coefficients are set by the control device 3 determined.
- FIG. 4 shows—purely as an example—the case in which the desired profile value C at a distance a of 40 mm from the edges of the flat rolling stock 2 is used exclusively as the relevant target variable Z and the ideal contour curve ci is also a fourth-degree parabola .
- control device 3 uses the actual variables I of the flat rolling stock 2 and the ideal contour profile ci to determine target values COM for manipulated variables for the rolling stands 1. The determination is made using a model 6 of the rolling train (see FIG. 1).
- the rolling mill model is based on mathematical and physical equations. Suitable models are generally known to those skilled in the art. They are used in particular for presetting the rolling mill (setup calculation). Purely as an example, reference can be made to DE 10211 623 A1 for such a model.
- the manipulated variables act on corresponding actuators 7 to 9 of the roll stands 1.
- the actuators 7 to 9 can, for example, according to the illustration in FIG .
- the actuators 7 to 9 can include, for example, a sliding device 8, by means of which an opposite displacement of the working rolls 10 (and/or any intermediate rolls) can be set in the same or another roll stand 1.
- the actuators 7 to 9 can include a cooling device 9, for example, by means of which the work rolls 10 of one of the roll stands 1 can be cooled as a function of the location x. The cooling can thus be adjusted in a spatially resolved manner as seen in the width direction x.
- the actuators 7 to 9 can thus include actuators 7, 8, in which the associated manipulated variable affects the contour c of the flat rolling stock 2 globally over the entire width b of the flat rolling stock 2 be. Likewise, the actuators 7 to 9 can also include actuators 9 in which individual manipulated variables affect the contour c of the flat rolling stock 2 only locally.
- the control device 3 transmits the determined setpoint values COM to the roll stands 1 of the rolling mill (more precisely: to the real-time controls of the roll stands 1, ie to the so-called L1 system). This has the effect that the flat rolling stock 2 is rolled in the rolling train, taking into account the transmitted desired values COM.
- the manner in which the transmitted reference values COM are included in the rolling process can differ from reference value COM to reference value COM. It is possible that a specific setpoint COM is used directly and immediately as the corresponding setpoint of the respective real-time control. Al Alternatively, it is possible for a specific setpoint COM to be just a basic setpoint that is dynamically modified during the rolling process by an additional setpoint or multiple additional setpoints, for example to compensate for dynamic deflection of the corresponding roll stand 1 or fluctuations in tension in the flat rolling stock 2. However, even in the case of a dynamic modification, the respective desired value COM is always taken into account as such.
- Each determination of the desired values COM corresponds to a respective actual contour course ct, which the flat rolling stock 2 has after rolling in the rolling mill.
- the respective contour course ce which is expected for these desired values COM, is determined by means of the model 6 for a respective set of desired values COM.
- the desired values COM are determined in such a way that the expected contour ce corresponds as closely as possible to the ideal contour ci over the entire bandwidth b (or at least in the range from -b/2+a to b/2-a). is approached.
- the target values COM are thus varied - of course taking into account a termination criterion - until target values COM are determined, by means of which the expected contour profile ce corresponds to the ideal contour profile ci over the entire bandwidth b (or at least in the range from -b/2+a to b /2-a) is approximated as closely as possible.
- the so-called rms (root mean square) of the difference between the expected contour ce and the ideal contour ci can be minimized.
- FIG. 6 shows, in addition to the ideal contour curve ci with a reference sign “ce” in brackets, a corresponding expected contour curve when determining the desired values COM according to the procedure of the prior art.
- the distance al of the initial area boundaries 12 from the edges of the flat rolling stock 2 is greater than the distance a to which the desired profile value C is related. If the distance a is 40 mm, the distance al can be 100 mm, for example. Of course, another value is also possible.
- the part of the flat rolling stock 2 from the initial area limits 12 to the edges is not taken into account in the context of the optimization of the desired values COM according to step S4.
- the desired values COM are therefore only varied with the aim of bringing the expected contour ce as close as possible to the ideal contour ci in the initial central area 11 .
- FIG. 6 shows the expected contour curve ce as it results according to the procedure of the present invention.
- control device 3 can measure the initial area limits 12 or the distance between the initial area limits 12 and the edges of the flat rolling stock
- control device 2 accept.
- a specification by an operator 13 can follow.
- step Sil the control device 3 determines the distance a1 using the actual variables I of the flat rolling stock 2 and/or using the predetermined distance a.
- the control device 3 can on the one hand determine k times the distance a, where k is a value greater than 1, and on the other hand determine a predetermined percentage of the width b, the percentage being significantly less than 50%, as a rule less than 20%, mostly even less than 10%.
- the greater of the two determined values can be used as the distance a1.
- the percentage can be specified in a fixed manner for the control device 3 or, for example, by the operator 13 .
- steps S21 to S24 are present in addition to steps S1 to S5.
- step S21 the control device 3 checks whether a termination criterion is met. Possibilities for defining a sensible termination criterion are generally known to those skilled in the art. If the termination criterion is met, the desired values COM determined in step S4 are accepted and transmitted to the rolling train in step S5. If the termination criterion is not met, the control device 3 checks in step S22 whether the expected contour (ie the expected contour curve ce) is convex. If this is the case, the control device 3 enlarges the initial middle region 11 in step S23. It therefore reduces the distance a1. Conversely, if the expected contour is not convex, the control device 3 reduces the initial central region 11 in step S24. It therefore increases the distance a1. Then the controller 3 returns to step S4.
- the expected contour ie the expected contour curve ce
- FIG. 8 thus results in the distance al being determined as small as technically reasonable in an iterative procedure.
- steps S1 to S5 and optionally also steps S11 and S21 to S24 are carried out by the control device 3 before the flat rolling stock 2 is rolled in the rolling train.
- steps S11 and S21 to S24 are carried out by the control device 3 before the flat rolling stock 2 is rolled in the rolling train.
- steps S11 and S21 to S24 are carried out by the control device 3 before the flat rolling stock 2 is rolled in the rolling train.
- steps S11 and S21 to S24 are carried out by the control device 3 before the flat rolling stock 2 is rolled in the rolling train.
- the control device 3 receives measured variables M in a step S31.
- the measured variables M are characteristic of an actual contour course ct of the flat rolling stock 2, which was achieved by rolling the flat rolling stock 2 in the rolling train.
- the thickness d can be detected as a function of the width b of the flat rolling stock 2 by means of an X-ray measurement and fed to the control device 3 .
- the actual course of the contour ct is shown in FIG.
- the control device 3 determines an associated contour function cf'.
- FIG. 10 shows a possible contour function cf'.
- the term "contour function" is to be understood comprehensively. In particular, it also includes the case in which the contour function cf' corresponds 1:1 to the actual contour course ct. However, it also includes the case in which the actual contour course ct is only approximated
- the control device 3 can determine coefficients of a polynomial which defines the contour function cf'.
- step S32 is known from the prior art.
- a contour function cf" is determined in such a way that the contour function cf" is as wide as possible over the entire width b of the flat rolling stock 2 (or at least in the range from -b/2+a to b/2-a). is approximated to the actual contour ct.
- only a final middle region 11' is considered in the present invention to determine the contour function cf'. It is possible that the contour function cf' is only determined in the final middle area 11'.
- contour function cf' is determined over the entire width b of the flat rolling stock 2 (or at least in the range from -b/2+a to b/2-a), for the approximation to the actual contour ver run ct, so for example the determination of the coefficients th, but only the final middle area 11 'is considered.
- the control device 3 finally calculates a profile value C' of the flat rolling stock 2 using the contour function cf'.
- This profile value C' is referred to below as the modeled profile value C'.
- the modeled profile value C' is not the actual profile value C", which results from the actual contour course ct or which results from determining a contour function cf", if this se (as in the prior art) over the entire width b of the flat rolling stock 2 (or at least in the range from -b/2+a to b/2-a) is approximated to the actual course of the contour ct.
- the contour function cf' is only different, mostly flatter, than the contour function cf" in the final middle area 11' due to the adaptation to the actual contour course ct".
- the calculated profile value C' is a value which is smaller than the actual profile value C'' at a distance a from the edges of the flat rolling stock 2.
- an evaluation can also be carried out at a greater distance al' than the distance a.
- the contour function cf' can be evaluated at the distance al' and this value can be used as the modeled profile value C'.
- a step S34 the control device 3 evaluates the modeled profile value C′ as a profile value as part of a model adaptation, by means of which the control device 3 adapts the model 6 of the rolling train.
- the control device 3 thus acts as if the value C' had resulted as the actual profile value in the predetermined distance a, but not the value C".
- the correspondingly adapted model 6 is used when the procedure from FIG 9) within the scope of determining the desired values COM for the next flat rolled stock 2 or the next flat rolled stock 2 of the same type.
- the final central range 11′ can match the initial central range 11 that was used to determine the desired values COM.
- the distance al' can also correspond to the distance al. This represents the simplest case. However, it is also possible to modify the procedure from FIG. 9 in accordance with the illustration in FIG.
- the control device 3 checks in a step S41 whether a termination criterion has been met. Possibilities for defining a meaningful termination criterion ums are well known to those skilled in the art. If the termination criterion is met, the control device 3 goes to step S33 and from there to step S34.
- the control device 3 checks in a step S42 whether the determined contour function cf' is convex in the final middle region 11'. If this is the case, the control device 3 enlarges the final middle area 11' in a step S43. So it reduces the distance al'. Conversely, if the determined contour function cf' is not convex in the final middle area 11', then the control device 3 reduces the size of the final middle area 11' in a step S44. So it increases the distance al'. Then the controller 3 returns to step S32.
- FIG. 11 thus results in the distance al' being determined as small as technically reasonable in an iterative procedure.
- steps S1 to S5 and possibly also steps S11 and S21 to S24 are carried out by the control device 3 before the flat rolling stock 2 is rolled in the rolling train.
- steps S11 and S21 to S24 are carried out by the control device 3 before the flat rolling stock 2 is rolled in the rolling train.
- steps S11 and S21 to S24 are carried out by the control device 3 before the flat rolling stock 2 is rolled in the rolling train.
- steps S11 and S21 to S24 are carried out by the control device 3 before the flat rolling stock 2 is rolled in the rolling train.
- the additional steps of FIG. 12 are carried out during the rolling of the flat rolled stock 2 in the rolling train.
- the control device 3 receives the measured variables M in a step S51.
- the content of step S51 corresponds to step S31 in FIGS. 9 and 11.
- the difference is essentially the point in time at which step S51 is carried out, namely already during the rolling of the flat rolling stock 2 in the rolling train.
- the measured variables M relate to a section of the flat rolling stock 2, which has already been rolled, while currently another cut from the flat rolling stock 2 is rolled.
- step S52 the control device 3 determines an associated contour function cf'.
- the content of step S52 is similar to step S32 in FIGS. 9 and 11.
- step S53 the control device 3 uses the deviation of the contour function cf' from the ideal contour curve ci to track the desired values COM for the manipulated variables. Then the controller 3 goes back to step S5.
- the final central area 11' can be combined with the initial central area
- the distance al' can also correspond to the distance al. This represents the simplest case. However, it is also possible to use the procedure of FIG.
- FIG. 13 modifies the procedure of FIG. 12 in the same way in which the procedure of FIG. 9 was modified in FIG.
- the control device 3 checks in a step S61 whether a termination criterion has been met. Possibilities for defining a meaningful termination criterion are generally known to those skilled in the art. If the termination criterion is met, the control device 3 goes to step S53 and then back to step S5.
- the control device 3 checks in a step S62 whether the determined contour function cf' is convex in the final middle region 11'. If this is the case, the control device 3 increases in in step S63 the final central area 11'. So it reduces the distance al'. Conversely, if the determined contour function cf' is not convex in the final middle area 11', then the control device 3 reduces the size of the final middle area 11' in a step S64. So it increases the distance al'. Then the controller 3 returns to step S52.
- FIG. 13 thus leads to the distance al' being determined as small as technically sensible in an iterative procedure.
- the manipulated variables can act on actuators 7, 8, which affect the contour c of the flat rolled stock 2 over the entire width b of the flat rolled stock 2.
- a cooling device 9 it is also possible for a cooling device 9 to be present, by means of which the work rolls 10 of at least one of the roll stands 1 can be cooled in a spatially resolved manner over the rolling stock width b. In this case, it is possible to modify the procedure in FIG. 3 (or possibly one of the configurations in FIGS. 6 to 13 based on it) in the way explained below in connection with FIG.
- steps S71 to S73 are present in addition to steps S1 to S5.
- steps S71 and S72 are carried out before step S5.
- Step S73 is usually carried out together with step S5.
- step S71 the control device 3 determines in the edge areas of the flat rolling stock 2 - ie between the initial area limits 12 and the edges of the flat rolling stock 2 - the deviation of the expected contour ce from the ideal contour ci. Based on this, the control device 3 determines in step S72 for those elements of the cooling device 9 which are on the edge regions of the flat chen rolling stock 2 act, control values.
- the control values are determined in such a way that on the one hand the expected contour profile ce in the edge areas of the flat rolling stock 2 is approximated as closely as possible to the ideal contour profile ci, but on the other hand the expected contour profile ce in the initial central area 11 does not change will.
- step S73 the desired values COM and, in addition, the control values determined are output to the cooling device 9 and the cooling device 9 is thus controlled accordingly.
- the expected contour profile ce is approximated as closely as possible to the ideal contour profile ci, even in the areas from the area boundaries 12 to the edges of the flat rolling stock 2 , but only to a lesser extent.
- the setpoint values COM for actuators 7, 8, in which the associated manipulated variable affects the contour c of the flat rolling stock 2 globally over the entire width b of the flat rolling stock 2, are not changed.
- the set values COM for actuators 9, in which individual manipulated variables affect the contour c of the flat rolling stock 2 only locally, are only changed to the extent that this is possible without changing the expected contour curve ce in the initial middle region 11.
- the activation of the corresponding elements of the cooling device 9 is associated with a maximization of the coolant flow. In some cases, however, it may be necessary to minimize or at least reduce the coolant flow.
- the present invention has many advantages.
- an enlargement of the initial central area 11 is possible, over which a so-called box profile can be achieved. Nevertheless, the rolling process can be kept reliably stable.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP22733033.9A EP4355507A1 (de) | 2021-06-17 | 2022-06-09 | Verfahren zum herstellen eines walzguts mit kastenprofil |
CN202280043083.5A CN117500617A (zh) | 2021-06-17 | 2022-06-09 | 用于制造具有箱形断面的轧件的方法 |
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Application Number | Priority Date | Filing Date | Title |
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EP21179945.7 | 2021-06-17 | ||
EP21179945.7A EP4104944A1 (de) | 2021-06-17 | 2021-06-17 | Verfahren zum herstellen eines walzguts mit kastenprofil |
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WO2022263266A1 true WO2022263266A1 (de) | 2022-12-22 |
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PCT/EP2022/065629 WO2022263266A1 (de) | 2021-06-17 | 2022-06-09 | Verfahren zum herstellen eines walzguts mit kastenprofil |
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EP (2) | EP4104944A1 (de) |
CN (1) | CN117500617A (de) |
WO (1) | WO2022263266A1 (de) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6158260A (en) | 1999-09-15 | 2000-12-12 | Danieli Technology, Inc. | Universal roll crossing system |
DE10211623A1 (de) | 2002-03-15 | 2003-10-16 | Siemens Ag | Rechnergestütztes Ermittlungverfahren für Sollwerte für Profil-und Planheitsstellglieder |
WO2019086172A1 (de) | 2017-11-06 | 2019-05-09 | Primetals Technologies Germany Gmbh | Gezielte einstellung der kontur durch entsprechende vorgaben |
WO2020016387A1 (de) | 2018-07-19 | 2020-01-23 | Sms Group Gmbh | VERFAHREN ZUM ERMITTELN VON STELLGRÖßEN FÜR AKTIVE PROFIL- UND PLANHEITSSTELLGLIEDER FÜR EIN WALZGERÜST UND VON PROFIL- UND MITTENPLANHEITSWERTEN FÜR WARMGEWALZTES METALLBAND |
CN110479770B (zh) * | 2019-08-07 | 2021-04-06 | 武汉钢铁有限公司 | 一种二十辊轧机板形的优化控制方法 |
-
2021
- 2021-06-17 EP EP21179945.7A patent/EP4104944A1/de not_active Withdrawn
-
2022
- 2022-06-09 WO PCT/EP2022/065629 patent/WO2022263266A1/de active Application Filing
- 2022-06-09 EP EP22733033.9A patent/EP4355507A1/de active Pending
- 2022-06-09 CN CN202280043083.5A patent/CN117500617A/zh active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6158260A (en) | 1999-09-15 | 2000-12-12 | Danieli Technology, Inc. | Universal roll crossing system |
DE10211623A1 (de) | 2002-03-15 | 2003-10-16 | Siemens Ag | Rechnergestütztes Ermittlungverfahren für Sollwerte für Profil-und Planheitsstellglieder |
WO2019086172A1 (de) | 2017-11-06 | 2019-05-09 | Primetals Technologies Germany Gmbh | Gezielte einstellung der kontur durch entsprechende vorgaben |
WO2020016387A1 (de) | 2018-07-19 | 2020-01-23 | Sms Group Gmbh | VERFAHREN ZUM ERMITTELN VON STELLGRÖßEN FÜR AKTIVE PROFIL- UND PLANHEITSSTELLGLIEDER FÜR EIN WALZGERÜST UND VON PROFIL- UND MITTENPLANHEITSWERTEN FÜR WARMGEWALZTES METALLBAND |
CN110479770B (zh) * | 2019-08-07 | 2021-04-06 | 武汉钢铁有限公司 | 一种二十辊轧机板形的优化控制方法 |
Also Published As
Publication number | Publication date |
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CN117500617A (zh) | 2024-02-02 |
EP4104944A1 (de) | 2022-12-21 |
EP4355507A1 (de) | 2024-04-24 |
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