EP2931446A1 - Verfahren zum betrieb einer walzanlage - Google Patents
Verfahren zum betrieb einer walzanlageInfo
- Publication number
- EP2931446A1 EP2931446A1 EP13805314.5A EP13805314A EP2931446A1 EP 2931446 A1 EP2931446 A1 EP 2931446A1 EP 13805314 A EP13805314 A EP 13805314A EP 2931446 A1 EP2931446 A1 EP 2931446A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- measured
- rolling stock
- rolling
- segment
- volume
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2273/00—Path parameters
- B21B2273/20—Track of product
Definitions
- multi-stand rolling mill in particular for tracking material transported through the plant rolling stock.
- the object of the invention is to provide an efficient method for tracking selectable sections (segments) of a rolling stock, such as a strip, during passage through a rolling train with respect to time and location of a segment in the rolling train.
- a rolling stock such as a strip
- the terms rolling stock and strip are used interchangeably below for the material to be rolled.
- the method for different metrological equipment of rolling mills should be applicable, in particular for cost reduction with increasing efficiency requirements.
- band segments are supported by a mathematical method that evaluates measured variables and / or setpoints.
- This method of operating a rolling mill comprises the steps of
- Measuring point at least one of the other operating parameters from the group
- identification means the time assignment of a band segment to a location of the plant; Under detection within the meaning of the invention, the temporal assignment of a measurement or a desired value to a measuring point of the system to understand By using at least one unmeasured nominal value at a given measuring point, a corresponding measurement of this value can be dispensed with.
- volume resp means the volume resp.
- Mass segmentation using such setpoints or reference values continues to be done with sufficient accuracy.
- a setpoint value in the sense of the invention is understood to mean any value entering the identification of the volume segment which is not an immediate measured value, for example invariable parameters of the system or preselectable setpoint values or calculated setpoint values, such as roll thickness.
- a desired value at a measuring point in the sense of the invention may be a value which has been measured at a preceding measuring point.
- the term setpoint may be considered equivalent to a predetermined value or other operating parameter.
- the invention may be directed to the following features of a method of operating a rolling mill as follows:
- Identifying a volume segment at at least one measuring point by detecting and integrating at least one of the following combinations of measured and / or predetermined operating parameters i) to v 2 ): i) Measured cross-sectional area of the band, measured
- this process can be carried out either alone or as a preferred embodiment of the former method.
- the methods i) -v 2 ) mentioned differ essentially in the number of signals or measured values required for the segmentation. If the operating parameters are measured at several measuring points, the accuracy of the segment tracking increases, but at the cost of a high level of equipment complexity.
- the measurement of a strip cross-section and the strip speed can take place at a first measuring point and, in addition, the speed of the strip can be measured at further measuring points passed through the strip at a later time.
- the speed of the strip can be measured at further measuring points passed through the strip at a later time.
- Cross-sectional area can be calculated only by multiplying the material thickness with a fixed width of the band as constant.
- Velocity values also require the measured values of all cross-sectional areas at the following measuring points.
- volume or mass segment of several of the combinations mentioned i) - v 2 ) used This creates a redundancy which, for example, can serve to control the quality of the segmentation by comparing the identification by the various methods.
- a segmentation of the strip into a plurality of mass or volume segments is performed at a first measuring point of the rolling mill by integration, the segment data being carried out only by an automation system, in particular by means of an automation system
- Shift registers are pushed through the rolling mill.
- the number of required measured values or measuring points can be considerably reduced.
- This embodiment can also be understood independently of the above-mentioned method for operating a rolling mill.
- segmentation into mass or volume segments is performed by integration at a plurality of measuring points, and the measuring points following the first measuring point in the strip running direction are synchronized by the first measuring point.
- Synchronization can be forwarded by shift registers to the following measuring points.
- Synchronization or initial synchronization means in particular that a start signal or the start time is given at the beginning of the integration at a measuring point.
- a segmentation in mass or volume segments is performed by integration at a plurality of measuring points and as operating parameters at one of the measuring points corresponding measured or further operating parameters of the
- a first synchronization takes place at a measuring point by detecting (the position or the presence) of the tape head and / or by detecting a part of the tape following the tape head.
- the detection of the tape head does not necessarily have to be done at each measuring point. Other parts of the volume that go to
- Example can also be used for synchronization are
- the effect of the rolling stand on the segment is determined by checking at least one of the measured or further operating parameters.
- the effect of setting the framework on the rolling stock can be determined or the effect of the entire system on the rolling stock.
- a tape head run-in signal is detected as a measured operating parameter.
- This signal can act as a start signal for the integration of the volume segments at the respective measuring point. Since the tape head inlet signal is regularly recorded for safety reasons and for other functions of the rolling mill, it is particularly well suited for
- volume segments are provided, wherein the identification or
- the inlet side belt speed can be determined in one or more ways, e.g. by a laser beam, by a sensor of an input-side deflection roller and / or by measuring the rolling process of a Abhaspeis.
- the diameter and angular velocity of the chopper can be continuously determined to calculate the inlet-side belt speed.
- the bandwidth is measured only in front of the first rolling stand. Alternatively, it may also be provided for further simplifications that the bandwidth is received as an unmeasured setpoint in the identification of the volume segments.
- a reduction of measuring points and sensors is advantageous in that, for example, the strip thickness is measured at, for example, not more than three measuring points.
- a first measuring point may be provided in front of a first rolling stand, a second immediately after the first rolling stand and a third after the last rolling stand.
- the location of the measuring points is not limited to the areas in front of or behind a scaffold, a measuring point or several measuring points may or may also be located on a scaffold or more scaffolding.
- FIG. 1 shows an example of a rolling mill for carrying out the method according to the invention
- FIG. 2 shows an exemplary flowchart with possible combinations of a volume segmentation according to the invention
- FIG. 3 shows a fault analysis comparing the method according to the invention and a method according to the prior art
- Figure 4 is an exemplary output of a volume integrator
- FIG. 5 shows an exemplary flow diagram of a volume segmentation according to an embodiment of the invention. Detailed description of the embodiments
- the rolling mill 1 shown in FIG. 1 is provided with four rolling stands 2. A possible
- Instrumentation equipment is also shown in FIG. Before the first rolling stand 2, the speed of the incoming belt 3 by means of a speed measuring device 4 and the thickness of the incoming belt 3 by means of a thickness gauge 5, preferably continuously measured.
- the speed measurement is carried out, for example, by means of a deflection roller and / or non-contact with a
- the thickness measurement can be done for example by absorption of X-rays. There are others
- Speed or thickness measuring devices 4, 5 can be used.
- each segment i of the belt 3 is assumed to be constant when passing through the rolling train 1. However, the masses M i can be chosen differently for different segments i.
- the integration over time t takes place until the constant or predetermined mass M, of the respective segment i is reached. Subsequently, the integration of the
- each volume segment V can be determined by temporal integration over the product of its cross-sectional area A and its velocity v.
- the bandwidth b (corresponding to a desired value) can be regarded as constant.
- the volume flow at a possible measuring point M 0 , Mi, M 2 , M 3 , M ... M n is determined as the operating parameter.
- the integration is started, for example, when the tape head is detected at the respective measuring point.
- the above-mentioned integrations can be carried out at each measuring point M 0 , Mi, M 2 , M 3 , M ... M n .
- Which of the dimensions cross section A, thickness d, width b, velocity v, density p are used as measured values or as set values (given operating parameters or operating parameters measured elsewhere) depends on the desired degree of accuracy of the method, a possibly desired redundancy or of the equipment technical equipment of the rolling mill 1 from.
- the volume flow can be multiplied by the integration of the measured thickness d with the nominal bandwidth b considered as constant and the measured
- Material speed at a first measuring point M 0 are determined as operating parameters.
- the integration is started, for example, when the tape head is detected at the first measuring point M 0 (see also FIG. Behind the first roll stand 2, for example, the belt speed is measured, for example, by means of a deflection roller and / or optically.
- One or more shift registers transport the respective segment boundary with the physical belt speed, for example up to the measuring point M 2 .
- the integration at the measuring point M 2 is started when a segment boundary formed at the measuring point M 0 arrives at the measuring point M 2 and / or when the passage of the tape head is detected at the measuring point M 2 .
- the bandwidth b considered to be constant, the measured thickness behind the first framework 2 and the measured one
- the foregoing described embodiment can be largely modified. If, for example, no thickness measurement is available, the volume can also be calculated with the respective target thickness or an integration after the first measuring point M 0 is dispensed with and the segment boundary is shifted to the next measuring point exclusively by means of a shift register if the belt speed measurement is available. In the event that neither a band thickness measurement nor a
- Tape speed measurement at a particular measuring point are available or should be used for identification, an existing pair of values (material thickness and material speed) of another measuring point can be used, since the mass continuity is met in the rolling mill. It is For example, only tapehead detection is required to start the integration process.
- the choice of which segmentation method is used can be determined dynamically by the state and availability of the
- Measuring devices are made dependent.
- Each band segmentation method provides a counter value Z for the currently measured band segment and a signal for the associated measurement location, eg M 0 , M 2 , M.
- the volume segment size can be changed during ongoing rolling operation. An adjustment of the segment volume can take place immediately behind a segment boundary. The count value of the first segment with the new segmentation size volume segment V is sent to all other measuring points.
- FIG. 3 shows a comparison between the segmentation after one
- Embodiment of the inventive method volume segmentation and the time-controlled method, as it corresponds to the above-described prior art shown.
- the correct physical segmentation (Vol) is counted up for different measuring points M 0 to M 5 in each case in the upper part at the bottom, in each case the segmentation corresponding to a constant time base (Iso).
- the time-based segmentation no longer matches the physically correct segmentation.
- the band position of segment 1 1 at the different measuring points shifts from the time-based segment 8 at the first measuring point M 0 into the segment 5 at measuring point M 5 .
- Method of the present invention has different small discretization errors. Depending on the combination, this can, for example, in the
- Magnitude of the basic cycle time of the automation system and is in this case the same for all measuring points.
- An integrator is used to calculate the volume sequence. This determines the segment boundaries for the size of a given volume via one of the preceding equations. When the appropriate segment size is reached, the integrator is reset. The output of such a device has, for example, a course as shown in FIG. If the nominal volume (in the case shown: 3 segment volume units) is reached, a rising edge at the integrator output triggers an incremental count signal Z.
- the volume segmentation can in particular take place at a first measuring point or measuring position M 0 .
- the input value for the segmentation would be the material speed, the cross-sectional area, the material density and
- the volume segment size to be subdivided which can be variably specified.
- the material speed can be determined in one or more ways, as described in advance. Setpoint values can also be used for all measured operating parameters.
- the volume segmentation can take place behind the first measuring point M 0, for example functionally as at the first measuring position.
- measured operating parameters can be replaced by setpoints. Assuming mass conservation or volume conservation (assuming a constant density), the measured operating parameters may be different from others
- Measuring points are used as predetermined operating parameters.
- the count can be synchronized via the shift of the segment boundaries as soon as the required operating parameters are met, or by the recognition of the rolling stock at the measuring point.
- the desired segment volume or the target segment mass is supplied together with the associated segment count Z, for example, from the first measuring position M 0 or else from another preceding measuring position.
- the output of the volume segmentation at the first measuring point can be passed on to a cascade or series of Verschieberegister between the following measuring points.
- the measured operating parameter may be the measurement of the material speed.
- the segmentation depends on the operating parameters required for the segmentation. If some of the required operating parameters are invalid, for example due to erroneous or failed measuring signals, the segmentation at the corresponding measuring point can either be carried out by another method or the relevant operating parameters can be replaced by the associated setpoint values.
- Method B Initial synchronization is achieved at the first measuring point integration over mass or volume segments made (Method B), this segmentation is pushed through shift register through the rolling mill (Method A). If the segmentation (method B) that has been performed fails at one or more measuring points after the initial synchronization, it can automatically access the method of integration via mass or
- Shift register (method A) are used by the rolling line, so that the method A is a detachment function. If the required operating parameters are available again, the system switches back to method B, where the integration is again carried out at each measuring point. The new
- Counter reading is synchronized via the corresponding value from the shift register. In the event of a failure of required measurements, use of setpoint values can be resorted to.
- the deviation between the individual methods can be used.
- various measures can be taken.
- the initial synchronization may be by the tape head entry signal. This detection can be done for example by means of force sensors, optical sensors or other detection methods.
- the position of the tape head can be determined depending on the time. This can be done on one or more of the
- the position of the tape head can be calculated by means of the automation system. For all methods, the integration of additional synchronization measuring points increases the positional accuracy of the rolling stock.
- the initial synchronization takes place behind the tape head.
- intermediate stand speeds are preferably measured and / or
- the identification of the volume segments takes place in a superordinate program unit which is responsible for setting the rolling mill. This can be done by assigning further measurement data to the mass or volume segments. To optimize the automation tasks, the identified volume segmentation can also be transferred to the higher-level program unit, which is responsible for setting the rolling mill.
- the parent program unit which is responsible for the setting of the rolling mill can be designed in particular adaptive learning.
- Operating parameters that have occurred during the rolling process are assigned to the respective identified volume segment of the tape, for example, an optimization and / or improved error control of the
- the method according to the invention is a rolling mill with a plurality of rolling stands before, with the input side
- the incoming belt is guided in accordance with this embodiment over a first deflection roller whose rotational speed is preferably measured continuously via a pulse generator. It follows, preferably immediately, the inlet side actual belt speed at a first measuring point M 0 as a first measured operating parameters.
- This measured value MISo is a Boolean measured variable of a first measuring point M 0 and represents a second measured operating parameter of the rolling mill.
- Embodiment further means for detecting the continuous tape head, which as further measuring points Mi, M 2 , ..., M n Boolean values MIS M i, MIS M 2, MIS Mn generate for the passage of the tape head.
- the passage of the tape head causes a first synchronization, which serves as a start signal for an integration process.
- the time integration of the product of a nominal strip thickness and a nominal bandwidth begins as reference values or unmeasured parameters and the strip speed measured in M 0 .
- the volume integrated over time controls a volume segment counter once it has reached a predetermined size, after which a re-integration of the next volume segment begins. In Fig. 5 this is due to the sawtooth curves in the volume-time diagrams shown.
- the timelines of the three diagrams shown below are identical, ie they start at the same time.
- the detection of the incoming belt speed M 0 is known at each measuring point, and thus passes through which volume segment at which point in time at which measuring point.
- Operating parameters to a respective volume segment allows. Such further operating parameters may be, for example, a local band distribution or measured values for the band flatness.
- the volume segments are preferably detected by a parent program unit, which is responsible for the setting of the rolling mill, the system and linked to the other measured and / or other operating parameters.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012222822 | 2012-12-11 | ||
| DE102012222996.5A DE102012222996B4 (de) | 2012-12-11 | 2012-12-12 | Verfahren zum Betrieb einer Walzanlage |
| PCT/EP2013/075358 WO2014090632A1 (de) | 2012-12-11 | 2013-12-03 | Verfahren zum betrieb einer walzanlage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2931446A1 true EP2931446A1 (de) | 2015-10-21 |
| EP2931446B1 EP2931446B1 (de) | 2016-07-27 |
Family
ID=50778211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13805314.5A Active EP2931446B1 (de) | 2012-12-11 | 2013-12-03 | Verfahren zum betrieb einer walzanlage |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2931446B1 (de) |
| DE (1) | DE102012222996B4 (de) |
| WO (1) | WO2014090632A1 (de) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008011275A1 (de) * | 2008-02-27 | 2009-09-10 | Siemens Aktiengesellschaft | Betriebsverfahren für eine mehrgerüstige Walzstraße mit Banddickenermittlung anhand der Kontinuitätsgleichung |
| IT1400550B1 (it) * | 2010-06-09 | 2013-06-11 | Danieli Automation Spa | Procedimento e dispositivo per il controllo dimensionale della sezione di un prodotto laminato. |
| DE102011077380A1 (de) * | 2011-06-10 | 2012-12-13 | Sms Siemag Ag | Verfahren zum Betrieb einer Walzanlage |
-
2012
- 2012-12-12 DE DE102012222996.5A patent/DE102012222996B4/de active Active
-
2013
- 2013-12-03 WO PCT/EP2013/075358 patent/WO2014090632A1/de not_active Ceased
- 2013-12-03 EP EP13805314.5A patent/EP2931446B1/de active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2014090632A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102012222996A1 (de) | 2014-06-12 |
| DE102012222996B4 (de) | 2026-05-21 |
| WO2014090632A1 (de) | 2014-06-19 |
| EP2931446B1 (de) | 2016-07-27 |
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