JP2009148797A - Control system for cold tandem rolling equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a control system for cold tandem rolling equipment in which the predicted accuracy of a control model is remarkably improved by measuring grain size information such as ferritic grain size as the material information of a rolled stock and making the measured results reflect in the control model. <P>SOLUTION: This control system is provided with: rolling equipment 1 for rolling the rolled stock 2 with a plurality of rolling stands; a laser ultrasonic grain size sensor 3 which is provided in the prestage of the rolling equipment 1 and with which the grain size information of the rolled stock 2 before being rolled with the rolling equipment 1 is measured; and a control means having a rolling control model about the rolling equipment 1 and for controlling the thickness of the rolled stock 2 by controlling the rolling equipment 1 on the basis of the calculated result of the rolling control model. The control means performs calculation by the rolling control model by taking the grain size information measured with the laser ultrasonic grain size sensor 3 as one input information. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a control device for using, in a control model, particle size information of a rolled material measured by a laser ultrasonic particle size sensor in a cold continuous rolling facility.

  The cold continuous rolling equipment is intended to make a strip into a predetermined shape, thickness, and surface state. Moreover, the cold-rolled rolled material has high strength due to the strengthening of the transition structure generated by rolling. For this reason, in cold continuous rolling equipment, it is generally performed to improve workability by performing an annealing process in a subsequent process. And, in order to obtain a predetermined recrystallized texture after the annealing, forming a microstructure and a cold-rolled texture is also one of the purposes of the cold continuous rolling equipment.

  For such a purpose, the cold continuous rolling equipment creates a rolling control model for controlling the plate thickness, and feeds back the actual values obtained by various measuring devices to perform the plate thickness control. Yes. Specifically, the rolling control model uses information such as the sheet thickness, sheet width, steel type of the rolled material before rolling, the sheet thickness of the rolled material after rolling, and the sheet width. As the feedback data for control, rolling load, tension, sheet thickness, rolling speed, etc. obtained by various measuring devices are utilized.

  In addition, as a conventional technique, by installing a particle size measuring device or an r value measuring device in the middle or immediately after the annealing furnace, the annealing temperature is appropriately changed based on the measurement result of the particle size measuring device or the r value measuring device. A configuration in which the particle size is controlled to a predetermined particle size or r value has been proposed (see, for example, Patent Document 1).

JP-A-5-171258

  In conventional cold continuous rolling equipment, in order to create a rolling control model, the steel type of the rolled material is used as a parameter indicating the material of the rolled material. However, unlike the case of sheet thickness and sheet width, which are other parameters used in the rolling control model, there is no means for confirming the validity of the steel type in the cold continuous rolling facility. On the other hand, the strength of the material does not necessarily match completely even with the same steel type. For this reason, in the calculated values such as rolling load calculated by the rolling control model, there are errors due to the above steel types, and there is a difference between the calculated value and the actual value.

  In addition, in the conventional cold continuous rolling equipment, in order to correct the difference between the calculated value calculated by the rolling control model and the actual value, a correction term is calculated from the ratio between the calculated value and the actual value. The learning control was reflected in the rolling process. However, no consideration is given to reflecting the material information of the rolled material in the rolling control model, and there has been a limit to improving the prediction accuracy of the rolling control model.

  On the other hand, in the subsequent annealing process, in order to obtain a predetermined recrystallization texture, a heating furnace temperature control model for controlling the temperature of the heating furnace is created, and temperature control is performed based on this heating furnace temperature control model. It has been broken. And conventionally, also about this heating furnace temperature control model, the steel type of a rolling material was utilized as a parameter which shows the material of a rolling material similarly to the case of a rolling control model. For this reason, even in the annealing treatment, there is a problem that there is no means for confirming the validity of the steel type in the cold continuous rolling equipment.

  The present invention has been made to solve the above-described problems, and its purpose is to measure particle diameter information such as ferrite particle diameter as material information of the rolled material, and to reflect the measurement result in the control model. Accordingly, it is an object of the present invention to provide a control device for cold continuous rolling equipment that can greatly improve the prediction accuracy of a control model.

  The control device for cold continuous rolling equipment according to the present invention includes a rolling device that rolls a rolled material by a plurality of rolling stands, and particle size information of the rolled material that is provided in a preceding stage of the rolling device and is rolled by the rolling device. A laser ultrasonic particle size sensor for measuring, a control unit for controlling the thickness of the rolled material by controlling the rolling device based on the calculation result of the rolling control model, and a rolling control model related to the rolling device; The control means performs calculation based on the rolling control model using the particle size information measured by the laser ultrasonic particle size sensor as one piece of input information.

  Further, a control device for cold continuous rolling equipment according to the present invention includes a rolling device that rolls a rolled material by a plurality of rolling stands, and a grain of the rolled material that is provided in a preceding stage of the rolling device and is not rolled by the rolling device. A first laser ultrasonic particle size sensor for measuring diameter information and a rolling control model related to the rolling device are provided, and the thickness of the rolled material is controlled by controlling the rolling device based on the calculation result of the rolling control model. A first control means, an annealing device provided in a subsequent stage of the rolling apparatus, a rolled material provided in the subsequent stage of the rolling apparatus and in the preceding stage of the annealing apparatus, after being rolled by the rolling apparatus and before being heated by the annealing apparatus The second laser ultrasonic particle size sensor for measuring the particle size information of the furnace and the furnace temperature control model for the annealing apparatus, and controlling the annealing apparatus based on the calculation result of the furnace temperature control model And a second control means for controlling the temperature of the rolled material, wherein the first control means uses the particle size information measured by the first laser ultrasonic particle size sensor as one input information, and also performs the second control. The means performs calculation based on the rolling control model and the heating furnace temperature control model using the particle size information measured by the second laser ultrasonic particle size sensor as one piece of input information.

  Further, the control device for cold continuous rolling equipment according to the present invention includes a rolling device for rolling a rolled material by a plurality of rolling stands, an annealing device provided at a subsequent stage of the rolling device, and a subsequent stage of the rolling device and an annealing device. A laser ultrasonic particle size sensor that measures the particle size information of the rolled material after being rolled by the rolling device and before being heated by the annealing device, and a furnace temperature control model for the annealing device Control means for controlling the temperature of the rolled material by controlling the annealing apparatus based on the calculation result of the heating furnace temperature control model, and the control means has a particle size measured by a laser ultrasonic particle size sensor. The information is used as one piece of input information and is calculated using a furnace temperature control model.

  According to the present invention, it is possible to greatly improve the prediction accuracy of the control model by measuring the grain size information such as ferrite grain size as the material information of the rolled material and reflecting the measurement result in the control model. become.

  In order to explain the present invention in more detail, it will be described with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified or abbreviate | omitted suitably.

Embodiment 1 FIG.
FIG. 1 is an overall configuration diagram showing a control device for cold continuous rolling equipment according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes a rolling apparatus composed of a first rolling stand to a fifth rolling stand. The rolled material 2 is rolled by the rolling device 1.

  Laser ultrasonic particle size sensors 3 and 4 are installed in the former stage and the latter stage (upstream side and downstream side) of the rolling device 1 of the cold continuous rolling facility. The laser ultrasonic particle size sensors 3 and 4 measure the ferrite particle size of the rolled material 2 conveyed in the cold continuous rolling facility as particle size information, and output the measurement result. Specifically, the laser ultrasonic particle size sensor 3 installed at the front stage of the rolling device 1 measures the ferrite particle size of the rolled material 2 before being rolled by the rolling device 1. The laser ultrasonic particle size sensor 4 installed at the rear stage of the rolling device 1 measures the ferrite particle size of the rolled material 2 after being rolled by the rolling device 1.

  In the cold continuous rolling facility, various measuring devices are provided in order to collect various information related to the rolled material 2. For example, a plate width measuring device (not shown) for measuring the plate width of the rolled material 2, plate thickness measuring devices 5 to 8 for measuring the plate thickness of the rolled material 2, and the surface state (flatness etc.) of the rolled material 2 A flatness measuring device 9 for measuring, speed measuring devices 10 to 12 for measuring a conveying speed of the rolled material 2, and the like are installed as shown in FIG. Moreover, although illustration is abbreviate | omitted, the rolling load and tension | tensile_strength which act on the rolling material 2 are measured by the rolling load measuring device and tension measuring device provided in the rolling apparatus 1 grade | etc.,.

Reference numeral 13 denotes an electric room for cold continuous rolling equipment. The cold continuous rolling facility electrical chamber 13 is provided with first control means (not shown) for controlling the rolling device 1 to control the thickness of the rolled material 2.
Below, based on FIG.1 and FIG.2, the concrete structure and function of the said 1st control means are demonstrated. FIG. 2 is a main part configuration diagram showing a control device for a cold continuous rolling facility according to Embodiment 1 of the present invention.

  A 1st control means is comprised by the high-order computer 14 and the level 1 controller 15 which were installed in the cold continuous rolling equipment electrical room 13, for example. The host computer 14 stores a rolling control model related to the rolling device 1. As shown in FIG. 1, this rolling control model is composed of a plurality of models, for example, a model relating to roll temperature and wear, a model relating to setting of a cold rolling mill, and a model relating to shape setting of the rolled material 2, 14 calculates control parameters by applying various input information to these rolling control models.

  As input information for the rolling control model, for example, rolling material information 16 such as steel type, sheet thickness, and sheet width and product information 17 such as sheet thickness and sheet width are used. In addition, regarding the rolling material information 16, in order to improve the calculation precision by a rolling control model, generally the measured value of the various measuring apparatuses provided in the front | former stage of the rolling apparatus 1 is utilized.

  In the present invention, the ferrite particle size measured by the laser ultrasonic particle size sensor 3 is also used as one of input information for the rolling control model. In the rolling control model, the input ferrite grain size is applied to correction of a parameter affected by the material of the rolled material 2. For example, when a steel type is used as the material information of the rolled material 2 and the deformation resistance of the rolled material 2 is estimated from this steel type, the deformation resistance estimated from the steel type is measured by the laser ultrasonic particle size sensor 3. Correction is made based on the measured ferrite grain size, and the optimum control parameter for actual rolling is calculated.

  The control parameters obtained by the rolling control model based on each input information are transmitted to the level 1 controller 15. The level 1 controller 15 controls the rolling device 1 based on this control parameter and the actual value fade-back from various measuring devices to control the thickness of the rolled material 2. As the actual value, as shown in FIG. 2, for example, a plate thickness, a tension, a rolling speed, a rolling load, and the like are used.

Next, the operation of the control device for the cold continuous rolling equipment having the above configuration will be described.
In general, the increase in the strength of the material has a property that is inversely proportional to the 1/2 power of the grain size, and it is experienced that the yield strength (or tensile strength) σy and the grain size d are expressed by the following equations. Known.
σy = σi + kyd ^(−1/2) (Hall-Petch relational expression)
Here, σi is an average yield strength of the single crystal, and ky is a parameter that increases the yield strength of the crystal grain boundary.

  Therefore, the host computer 14 calculates the yield stress of the rolled material 2 based on the ferrite particle diameter measured by the laser ultrasonic particle diameter sensor 3. Then, the deformation resistance of the rolled material 2 calculated by the rolling control model based on the steel type of the rolled material 2 is corrected using the calculated yield stress. According to this configuration, the material of the rolled material 2 can be accurately grasped, and the accuracy of the rolling control model can be improved.

Further, an annealing apparatus (not shown) provided with a heating furnace for heating the rolled material 2 is provided at the subsequent stage of the rolling apparatus 1. The laser ultrasonic particle diameter sensor 4 is installed in the front | former stage of this annealing apparatus, and measures the ferrite particle diameter of the rolling material 2 before being heated by an annealing apparatus. In FIG. 1, 18 is an electrical room for annealing equipment. The annealing equipment electrical chamber 18 is provided with second control means (not shown) for controlling the temperature of the rolled material 2 by controlling a heating furnace of the annealing apparatus.
Below, based on FIG.1 and FIG.3, the concrete structure and function of the said 2nd control means are demonstrated. FIG. 3 is a main part configuration diagram showing a control device for a cold continuous rolling facility according to Embodiment 1 of the present invention.

  The second control means includes, for example, a host computer 19 installed in the annealing facility electrical room 18 and a controller (not shown). The host computer 19 stores a heating furnace temperature control model relating to the annealing apparatus, and calculates the heating furnace temperature and the predicted particle size by applying various input information to the heating furnace temperature control model.

  As input information for the heating furnace temperature control model, for example, the ferrite particle size measured by the laser ultrasonic particle size sensor 4 is used in addition to the heating material information 20 such as the steel type, the plate thickness, and the plate width. As described above, by adopting the measured value of the laser ultrasonic particle size sensor 4 as input information of the heating furnace temperature control model, it becomes possible to more accurately grasp the material of the base material, and the accuracy of the heating furnace temperature control model is improved. Can be improved. That is, it is possible to always carry out optimum heating furnace temperature setting for a wide range of base materials.

  The grain size prediction value calculated by the furnace temperature control model and the ferrite grain size actual value measured by a laser ultrasonic grain size sensor (not shown) provided in the subsequent stage of the annealing apparatus are learned control means. 21, and the comparison result is reflected as a model correction value in the heating furnace temperature control model, so that the accuracy can be further improved.

  According to Embodiment 1 of the present invention, the particle size information such as the ferrite particle size is measured as the material information of the rolled material 2, and the measurement result is reflected in the control model, thereby greatly improving the prediction accuracy of the control model. Can be improved.

It is a whole block diagram which shows the control apparatus of the cold continuous rolling equipment in Embodiment 1 of this invention. It is a principal part block diagram which shows the control apparatus of the cold continuous rolling equipment in Embodiment 1 of this invention. It is a principal part block diagram which shows the control apparatus of the cold continuous rolling equipment in Embodiment 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolling apparatus 2 Rolled material 3, 4 Laser ultrasonic particle size sensor 5, 6, 7, 8 Plate thickness measuring device 9 Flatness measuring device 10, 11, 12 Speed measuring device 13 Cold continuous rolling equipment electric room 14 Host computer 15 Level 1 controller 16 Rolled material information 17 Product information 18 Annealing equipment electrical room 19 High-order computer 20 Heating material information 21 Learning control means

Claims (4)

A rolling device for rolling the rolled material by a plurality of rolling stands;
A laser ultrasonic particle size sensor that is provided in a previous stage of the rolling device and measures particle size information of the rolled material before being rolled by the rolling device;
Control means for controlling the thickness of the rolled material by controlling the rolling device based on the calculation result of the rolling control model, having a rolling control model related to the rolling device;
With
The said control means performs the calculation by the said rolling control model by using the particle size information measured by the said laser ultrasonic particle size sensor as one input information, The control apparatus of the cold continuous rolling equipment characterized by the above-mentioned.   The control means calculates the yield strength of the rolled material based on the particle size information measured by the laser ultrasonic particle size sensor, and calculates the deformation resistance of the rolled material calculated based on the steel type of the rolled material. The control apparatus for cold continuous rolling equipment according to claim 1, wherein correction is performed by using the yield strength. A rolling device for rolling the rolled material by a plurality of rolling stands;
A first laser ultrasonic particle size sensor that is provided in a preceding stage of the rolling device and measures particle size information of the rolled material before being rolled by the rolling device;
A first control means for controlling the thickness of the rolled material by controlling the rolling device based on a calculation result of the rolling control model, the rolling control model relating to the rolling device;
An annealing apparatus provided at a subsequent stage of the rolling apparatus,
2nd laser ultrasonic particle which is provided in the back | latter stage of the said rolling apparatus and the front | former stage of the said annealing apparatus, and measures the particle size information of the said rolling material after rolling by the said rolling apparatus and before being heated by the said annealing apparatus. A diameter sensor;
A second control means for controlling the temperature of the rolled material by controlling the annealing apparatus based on a calculation result of the heating furnace temperature control model, having a heating furnace temperature control model related to the annealing apparatus;
With
The first control means uses the particle size information measured by the first laser ultrasonic particle size sensor as one input information, and the second control means measures the second laser ultrasonic particle size sensor. A control apparatus for a cold continuous rolling facility, characterized by performing calculation using the rolling control model and the heating furnace temperature control model using particle size information as one piece of input information. A rolling device for rolling the rolled material by a plurality of rolling stands;
An annealing apparatus provided at a subsequent stage of the rolling apparatus,
A laser ultrasonic particle size sensor that is provided in a subsequent stage of the rolling apparatus and in an upstream stage of the annealing apparatus, and measures particle diameter information of the rolled material after being rolled by the rolling apparatus and before being heated by the annealing apparatus. When,
A control means for controlling the temperature of the rolled material by controlling the annealing apparatus based on the calculation result of the heating furnace temperature control model, having a heating furnace temperature control model related to the annealing apparatus,
With
The said control means performs calculation by the said heating furnace temperature control model by using the particle size information measured by the said laser ultrasonic particle size sensor as one input information, The control apparatus of the cold continuous rolling equipment characterized by the above-mentioned.

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