阅读说明：本技术 热轧生产线的温度控制装置 (Temperature control device of hot rolling production line ) 是由 铃木敦 于 2019-06-26 设计创作，主要内容包括：提供一种在并列设置有输出辊道冷却装置与加速冷却装置的热轧生产线中能够提高轧制材料的温度模型的精度的热轧生产线的温度控制装置。热轧生产线的温度控制装置具备：输出辊道侧计算部,对于向轧制材料注水的输出辊道冷却装置,在预测该轧制材料的温度的温度模型中,使用表示水冷冷却中的平均单位面积的除热量的输出辊道侧水冷传热系数计算该轧制材料的温度的预测值；以及加速侧计算部,对于设于所述输出辊道冷却装置的上游侧或者下游侧且以与所述输出辊道冷却装置不同的条件向该轧制材料注水的加速冷却装置,在预测该轧制材料的温度的温度模型中,作为表示水冷冷却中的平均单位面积的除热量的加速侧水冷传热系数使用区别于由所述输出辊道侧计算部设定的输出辊道侧水冷传热系数地设定的值,计算该轧制材料的温度的预测值。(Provided is a temperature control device for a hot rolling line, which can improve the accuracy of a temperature model of a rolled material in the hot rolling line in which a run-out table cooling device and an accelerated cooling device are arranged in parallel. A temperature control device for a hot rolling line is provided with: a run-out table side calculation unit that calculates a predicted value of the temperature of the rolled material using a run-out table side water-cooling heat transfer coefficient indicating an average amount of heat removal per unit area in water-cooling, in a temperature model that predicts the temperature of the rolled material, for a run-out table cooling device that injects water into the rolled material; and an acceleration-side calculation unit that calculates a predicted value of the temperature of the rolled material using, in a temperature model for predicting the temperature of the rolled material, a value set in a manner different from the run-out table-side water-cooling heat transfer coefficient set by the run-out table-side calculation unit as an acceleration-side water-cooling heat transfer coefficient indicating the amount of heat removed per unit area in water-cooling, for an acceleration cooling device that is provided on the upstream side or the downstream side of the run-out table cooling device and that injects water into the rolled material under a condition different from that of the run-out table cooling device.)

1. A temperature control device for a hot rolling line is provided with:

a run-out table side calculation unit that calculates a predicted value of the temperature of the rolled material using a run-out table side water-cooling heat transfer coefficient indicating an average amount of heat removed per unit area in water-cooling, in a temperature model that predicts the temperature of the rolled material, for a run-out table cooling device that injects water into the rolled material in a downstream process of a hot rolling line; and

and an acceleration-side calculation unit that calculates a predicted value of the temperature of the rolled material using a value set separately from the run-out table-side water-cooling heat transfer coefficient set by the run-out table-side calculation unit, as an acceleration-side water-cooling heat transfer coefficient indicating an average amount of heat removed per unit area in water-cooling, in a temperature model that predicts the temperature of the rolled material, for an acceleration cooling device that is provided upstream or downstream of the run-out table cooling device in a downstream process of the hot rolling line and that injects water into the rolled material under a condition different from that of the run-out table cooling device.

2. The temperature control apparatus of a hot rolling line according to claim 1,

the outlet-side calculating unit and the acceleration-side calculating unit calculate a learning value for correcting the predicted value of the temperature of the rolled material based on a difference between the predicted value of the temperature of the rolled material after cooling predicted by the temperature model and an actual measured value of the actual temperature.

3. The temperature control apparatus of a hot rolling line according to claim 2,

the run-out table side calculation unit and the acceleration side calculation unit calculate a learning value for correcting a predicted value of the temperature of the rolled material based on an actual result value of the temperature of the rolled material measured by an intermediate thermometer provided between the run-out table cooling device and the acceleration cooling device.

4. The temperature control apparatus of a hot rolling line according to claim 3,

the control unit closes the valves around the intermediate thermometer with respect to the run-out table cooling device and the accelerated cooling device.

5. The temperature control apparatus of a hot rolling line according to claim 4,

the control unit controls the valve of the run-out table cooling device so as to compensate for an error of the temperature model between an actual result value of the temperature of the rolled material measured by the intermediate thermometer and a predicted value of the temperature.

6. The temperature control apparatus of a hot rolling line according to claim 4,

the run-out table side calculation unit may calculate again a predicted value of a temperature change of the rolled material in the run-out table cooling apparatus using an actual result value of the temperature of the rolled material measured by the intermediate thermometer as an initial value when there is an error of the temperature model between the actual result value of the temperature of the rolled material measured by the intermediate thermometer and the predicted value of the temperature.

7. The temperature control apparatus of a hot rolling line according to any one of claims 1 or 2,

the run-out table side calculation unit calculates an average cooling efficiency of one valve based on a cooling efficiency obtained by an identification experiment using the run-out table cooling device alone, an actual result value of a temperature drop of the rolled material from an upstream side to a downstream side of the run-out table cooling device and the accelerated cooling device, and the number of ejectors used in the run-out table cooling device,

the accelerated side calculation unit calculates the average cooling efficiency of one valve from the cooling efficiency obtained by an identification experiment using the accelerated cooling device alone, an actual result value of a temperature drop of the rolled material from the run-out table cooling device to the downstream side of the accelerated cooling device, and the number of ejectors used in the accelerated cooling device.

8. The temperature control apparatus of a hot rolling line according to claim 7,

the run-out table side calculation unit calculates an actual result value and a learned value of a water-cooling heat transfer coefficient on the run-out table side from an actual result value of a temperature drop of the rolled material from an upstream side to a downstream side of the run-out table cooling device and the accelerated cooling device and the number of ejectors used in the run-out table cooling device, using a ratio of cooling efficiencies of the run-out table cooling device and the accelerated cooling device,

the acceleration-side calculation unit calculates an actual result value and a learned value of the acceleration-side water-cooling heat transfer coefficient from an actual result value of a temperature drop of the rolled material from an upstream side to a downstream side of the rollout table cooling device and the accelerated cooling device and the number of ejectors used in the accelerated cooling device, using a ratio of cooling efficiencies of the rollout table cooling device and the accelerated cooling device.

9. The temperature control apparatus of a hot rolling line according to claim 7,

the run-out table side calculation section calculates an average cooling efficiency of one valve based on a cooling efficiency obtained by an identification experiment using the run-out table cooling device alone, an actual result value of a temperature decrease of the rolled material from an upstream side to a downstream side of the run-out table cooling device and the accelerated cooling device, and a volume of an ejector flow rate used in the run-out table cooling device,

the acceleration-side calculation unit calculates the average cooling efficiency of one valve from the cooling efficiency obtained by an identification experiment using the acceleration cooling device alone, an actual result value of a temperature decrease of the rolled material from the run-out table cooling device to the downstream side of the acceleration cooling device, and a volume of the ejector flow rate used in the acceleration cooling device.

Technical Field

The present invention relates to a temperature control device for a hot rolling line.

Background

Patent document 1 discloses a temperature control device for a hot rolling line. According to the temperature control device, the accuracy of a temperature model in a Run Out Table (ROT) cooling device of a hot rolling line can be improved.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 5835483

Disclosure of Invention

Problems to be solved by the invention

However, the temperature control device described in patent document 1 is not controlled in a hot rolling line in which a run-out table cooling device and an accelerated cooling device are provided in parallel. Therefore, if a hot rolling line in which a run-out table cooling device and an accelerated cooling device are arranged in parallel is simply applied to the temperature control device, the accuracy of the temperature model cannot be improved.

The present invention has been made to solve the above problems. The invention aims to provide a temperature control device of a hot rolling line, which can improve the precision of a temperature model for the temperature of the hot rolling line provided with a run-out roller bed cooling device and an accelerated cooling device in parallel.

Means for solving the problems

The temperature control device for a hot rolling line of the present invention comprises: a run-out table side calculation unit that calculates a predicted value of the temperature of the rolled material using a run-out table side water-cooling heat transfer coefficient indicating an average amount of heat removed per unit area in water-cooling in a temperature model for predicting the temperature of the rolled material, for a run-out table cooling device that injects water into the rolled material in a downstream process of a hot rolling line; and an acceleration-side calculation unit that calculates, in a temperature model for predicting the temperature of the rolled material, a predicted value of the temperature of the rolled material using a value set separately from the run-out table-side water-cooling heat transfer coefficient set by the run-out table-side calculation unit as an acceleration-side water-cooling heat transfer coefficient indicating an average heat removal amount per unit area in water-cooling, for an acceleration cooling device that is provided upstream or downstream of the run-out table cooling device in a downstream process of the hot rolling line and that injects water into the rolled material under a condition different from that of the run-out table cooling device.

Effects of the invention

According to the present invention, the temperature control device sets the water-cooling heat transfer coefficient of the output roller way side and the water-cooling heat transfer coefficient of the acceleration side, respectively. Therefore, in a hot rolling line in which a run-out table cooling device and an accelerated cooling device are provided in parallel, the accuracy of the temperature model can be improved.

Drawings

Fig. 1 is a configuration diagram of a main part of a hot rolling line to which a temperature control device of a hot rolling line according to embodiment 1 is applied.

Fig. 2 is a perspective view of a cut plate to which a temperature control device of a hot rolling line according to embodiment 1 is applied.

Fig. 3 is a diagram showing a predicted value and an actual result value (a predicted value again) of a temperature change of each cut plate in an accelerated cooling equipment to which the temperature control apparatus of the hot rolling line in embodiment 1 is applied.

Fig. 4 is a diagram showing a predicted value and an actual result value (a predicted value again) of a temperature change of each cut plate in the run-out table cooling apparatus to which the temperature control apparatus of the hot rolling line according to embodiment 1 is applied.

Fig. 5 is a diagram showing a flow of error learning of a temperature model in an accelerated cooling equipment to which a temperature control apparatus of a hot rolling line according to embodiment 1 is applied.

Fig. 6 is a diagram showing a flow of error learning of a temperature model in a run-out table cooling apparatus to which the temperature control apparatus of the hot rolling line according to embodiment 1 is applied.

Fig. 7 is a hardware configuration diagram of a temperature control device of a hot rolling line in embodiment 1.

Fig. 8 is a diagram showing a predicted value and an actual result value (a predicted value again) of a temperature change of each cut plate in the run-out table cooling apparatus to which the temperature control apparatus of the hot rolling line according to embodiment 2 is applied.

Fig. 9 is a diagram showing a predicted value and an actual result value (a predicted value again) of a temperature change of each cut plate in an accelerated cooling equipment to which a temperature control apparatus of a hot rolling line in embodiment 3 is applied.

Fig. 10 is a diagram showing a predicted value and an actual result value (a predicted value again) of a temperature change of each cut plate in the run-out table cooling apparatus to which the temperature control apparatus of the hot rolling line according to embodiment 1 is applied.

Fig. 11 is a diagram showing a predicted value and an actual result value (a predicted value again) of a temperature change of each cut plate in an accelerated cooling equipment to which a temperature control apparatus of a hot rolling line according to embodiment 4 is applied.

Fig. 12 is a diagram showing a predicted value and an actual result value (a predicted value again) of a temperature change of each cut plate in the run-out table cooling apparatus to which the temperature control apparatus of the hot rolling line according to embodiment 4 is applied.

Detailed Description

The mode for carrying out the invention is explained in accordance with the attached drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals. Repetitive description of this part is appropriately simplified or omitted.

Embodiment 1.

Fig. 1 is a configuration diagram of a main part of a hot rolling line to which a temperature control device of a hot rolling line according to embodiment 1 is applied.

In the hot rolling line of fig. 1, a finishing mill 1 is provided downstream of a rough rolling mill, not shown. The accelerated cooling device 2 is provided on the downstream side of the finishing mill 1. The run-out table cooling device 3 is provided on the downstream side of the accelerated cooling device 2. The coiler 4 is provided on the downstream side of the run-out table cooling device 3.

The accelerated cooling device 2 is divided into a plurality of sections 2a in a cooling water supply system, and the plurality of sections 2a are arranged in the longitudinal direction of the hot rolling line. Each of the plurality of segments 2a includes a plurality of water injection valves 2 b. The plurality of water injection valves 2b are arranged in the longitudinal direction of the rolling line. A plurality of nozzles 2c are provided for the plurality of water injection valves 2 b. The plurality of nozzles 2c are arranged in the width direction of the hot rolling line.

The run-out table cooling apparatus 3 is composed of a water injection apparatus and a conveyance path (coveyance table). In the run-out table cooling device 3, a water injection device is provided at a position higher than the accelerated cooling device 2. In the run-out table cooling device 3, the water injection device is divided into a plurality of sections 3a in the supply system of the cooling water. The plurality of segments 3a are arranged in the longitudinal direction of the hot rolling line. Each of the plurality of segments 3a includes a plurality of water injection valves 3 b. The plurality of water injection valves 3b are arranged in the longitudinal direction of the hot rolling line. A plurality of nozzles 3c are provided for the plurality of water injection valves 3 b. The plurality of nozzles 3c are arranged in the width direction of the hot rolling line.

The finishing mill exit side thermometer 5 is provided between the finishing mill 1 and the accelerated cooling device 2. The intermediate thermometer 6 is arranged between the accelerated cooling device 2 and the run-out table cooling device 3. The coiling thermometer 7 is provided between the run-out table cooling device 3 and the coiler 4.

The finish rolling mill 1 performs finish rolling on the rolled material 8. Thereafter, the finish rolling mill exit thermometer 5 measures the initial Temperature of the entire length of the rolled material 8 before cooling as the FDT (finish Delivery-Side Temperature) actual result value. Thereafter, the accelerated cooling device 2 drives a pump, not shown, by an inverter, not shown, and injects water at high pressure to accelerate cooling of the rolled material 8. In the accelerated cooling, the cooling rate of the rolled material 8 is faster than that of normal water cooling. As a result, the crystal structure of the rolled material 8 is adjusted, and the mechanical properties of the rolled material 8 change.

Thereafter, the intermediate thermometer 6 measures the initial temperature of the entire length of the rolled material 8 as the MT actual result value. Thereafter, the run-out table cooling device 3 injects water at a constant pressure to cool the rolled material 8. Thereafter, the coiling thermometer 7 measures the initial temperature of the entire length of the rolled material 8 as the actual CT result value. Thereafter, the coiler 4 coils the rolled material 8.

The temperature control device 9 includes an acceleration-side calculation unit 9a, a run-out table-side calculation unit 9b, and a control unit 9 c.

The acceleration-side calculation unit 9a predicts the temperature of the rolled material 8 on the input/output side of each segment 2a of the accelerated cooling equipment 2 in advance using the temperature model. The run-out table side calculation unit 9b predicts the temperature of the rolled material 8 on the input/output side of each segment 3a of the run-out table cooling apparatus 3 in advance using the temperature model. The controller 9c controls the opening and closing of each water injection valve 2b of the accelerated cooling equipment 2 based on the prediction result of the accelerated calculation unit 9 a. The controller 9c controls the opening and closing of each water injection valve 3b of the run-out table cooling device 3 based on the prediction result of the run-out table side calculator 9 b.

After the rolled material 8 is taken up in the coiler 4, the acceleration-side calculator 9a learns the temperature model in the accelerated cooling equipment 2 based on the FDT actual result value from the finish rolling mill exit thermometer 5 and the MT actual result value from the intermediate thermometer 6. The run-out table side calculator 9b learns the temperature model in the run-out table cooling device 3 based on the MT actual result value from the intermediate thermometer 6 and the CT actual result value from the winding thermometer 7.

Specifically, the temperature control device 9 performs the prediction calculation of the temperature on the input/output side of each block 2a of the accelerated cooling device 2 and each block 3a of the run-out table cooling device 3 of each cutting board so that the final CT predicted value reaches the CT target value, with the FDT actual result value of each cutting board as a starting point. The temperature control device 9 determines a reference value (V) of the amount of cooling water to each zone 2a of the accelerated cooling device 2₁ ^acc，C₂ ^acc，···C_n ^acc) And a reference value (V) of the amount of cooling water to each zone 3a of the run-out table cooling device 3₁ ^rot，C₂ ^rot，···C_n ^rot)。

The number of water injection valves 2b to be opened is determined in each section 2a based on the reference value. The number of water injection valves 3b to be opened is determined in each section 3a based on the reference value.

When the cut strip of the rolled material 8 reaches the position of the intermediate thermometer 6, the temperature control device 9 learns the temperature model in the accelerated cooling equipment 2 so that the error at the position of the intermediate thermometer 6 becomes 0. When the rolled material 8 reaches the position of the winding thermometer 7, the temperature control device 9 learns the temperature model in the run-out table cooling device 3 so that the error at the position of the winding thermometer 7 becomes 0. At this time, the initial temperature in the temperature prediction of each cutting plate is set to the MT actual result value as the initial value.

Next, the concept of the temperature model will be described with reference to fig. 2.

Fig. 2 is a perspective view of a cut plate to which a temperature control device of a hot rolling line according to embodiment 1 is applied.

As shown in fig. 2, when the rolled material 8 is conveyed by the roll table 10 directly below the run-out table cooling device 3, the rolled material 8 is divided into cut plates 8a having a predetermined length, and the input and output of heat are calculated. For example, a certain length is set to be between 3m and 5 m.

As elements for inputting and outputting heat, water-cooling heat transfer, radiation, heat generation due to phase change, and the like are considered. For example, when only water-cooling heat transfer is an element, the heat removal amount (W) by water-cooling is expressed by the following expression (1).

[ formula 1 ]

Q_water＝h_wA_W(T_surf-T_W) (1)

In the formula (1), h_wIs the water-cooling heat transfer coefficient (W/mm)²/℃)。h_wThe accelerated cooling device 2 is different from the run-out table cooling device 3. A. the_wIs the area (mm) of the upper and lower surfaces of the cutting plate 8a in contact with the cooling water²)。A_wVarying in the number of filling valves that are open in each section. T is_wThe cooling is the temperature (. degree. C.) of the cooling water. T is_surfIs the surface temperature (. degree. C.) of the cutting plate 8 a.

At this time, the temperature change of each cutting plate 8a is represented by the following expression (2).

[ formula 2 ]

In the formula (2), T is the temperature (. degree. C.) of the cutting plate 8 a. ρ is the density (kg/mm) of the cut plate 8a³)。C_PIs the specific heat (J/kg/. degree. C.) of the cutting plate 8 a. l is the traveling direction of the cutting plate 8aTo length (mm). B is the width (mm) of the cutting plate 8 a. H is the plate thickness (mm) of the cut plate 8 a. T is time(s). i is the number of the cutting plate 8 a.

Next, the learning of the temperature model will be described with reference to fig. 3 and 4.

Fig. 3 is a diagram showing a predicted value and an actual result value (a predicted value again) of a temperature change of each cut plate in an accelerated cooling equipment to which the temperature control apparatus of the hot rolling line in embodiment 1 is applied. Fig. 4 is a diagram showing a predicted value and an actual result value (a predicted value again) of a temperature change of each cut plate in the run-out table cooling apparatus to which the temperature control apparatus of the hot rolling line according to embodiment 1 is applied.

As shown in fig. 3, in the cooling control in the accelerated cooling equipment 2, when a prediction error of the temperature model exists with respect to the MT actual result value, the prediction value on the input/output side of each block 2a is calculated again using the value of the prediction error. As a result, a reliable value is obtained as an actual result value of the temperature of the rolled material 8 on the input/output side of each segment 2 a.

As shown in fig. 4, in the cooling control in the run-out table cooling device 3, when a prediction error of the temperature model is present with respect to the CT actual result value, the prediction value on the input/output side of each block 3a is calculated again using the value of the prediction error. As a result, a reliable value is obtained as an actual result value of the temperature of the rolled material 8 on the input/output side of each segment 3 a.

Next, an outline of the learning function after completion of the winding of the rolled material 8 will be described with reference to fig. 5 and 6.

Fig. 5 is a diagram showing a flow of error learning of a temperature model in an accelerated cooling equipment to which a temperature control apparatus of a hot rolling line according to embodiment 1 is applied. Fig. 6 is a diagram showing a flow of error learning of a temperature model in a run-out table cooling apparatus to which the temperature control apparatus of the hot rolling line according to embodiment 1 is applied.

In fig. 5, as shown in the following expression (3), the water-cooling heat transfer coefficient h as the accelerated cooling equipment 2_w ^accZ of the learning value of₁ ^accAnd Z₂ ^accCan be automatically adjusted.

[ formula 3 ]

In the formula (3), v_a ^acc(m/s) is an average speed of each cutting plate 8a inside the accelerated cooling device 2. v. of₀(m/s) is a reference speed for accelerating the respective cutting plates 8a inside the cooling device 2. f. of_w ^accIs a model prediction function. Z₁ ^accIs a learning value of a multiplication type for the predicted value of the temperature model. Z₂ ^accIs an exponentiated learning value for the velocity ratio.

The cooling phenomenon in the rolled material 8 is different when the rolled material 8 is moving at a high speed from when the rolled material 8 is stationary. Therefore, as shown in equation (3), the influence of the speed is adjusted in the learning term.

Specifically, Z is obtained using data of the specific cut plate 8a of the Head portion which is a portion near the tip of the entire length of the rolled material 8₁ ^accSo that the error of the predicted value of MT of the cutting board 8a becomes 0. At this time, Z₂ ^accIs considered to be 0.

Using the data of the specific cut plate 8a of the Middle part, which is the part of the rolled material 8 under or after acceleration, to determine Z₂ ^accSo that the error of the predicted value of MT becomes 0. At this time, Z₁ ^accThe value obtained in the Head section is used.

Z obtained₁ ^accAnd Z₂ ^accThe predicted value of all the cut pieces 8a is calculated by substituting the formula (3). The accuracy of the entire length of the rolled material 8 is improved by setting the prediction error between the Head portion and the Middle portion to 0.

In fig. 6, as shown in the following expression (4), the water-cooling heat transfer coefficient h of the run-out table cooling apparatus 3_w ^rotIs Z as a learning value₁ ^rotAnd Z₂ ^rotCan be automatically adjusted.

[ formula 4 ]

In the formula (4), v_a ^rot(m/s) is the average speed of each cutting plate 8a inside the run-out table cooling device 3. v. of₀(m/s) is a reference speed of each cutting plate 8a inside the run-out table cooling device 3. f. of_w ^rotIs a model prediction function. Z₁ ^rotIs a learning value of a multiplication type for the predicted value of the temperature model. Z₂ ^rotIs an exponentiated learning value for the velocity ratio.

The cooling phenomenon in the rolled material 8 is different when the rolled material 8 is moving at a high speed from when the rolled material 8 is stationary. Therefore, as shown in equation (4), the influence of the speed is adjusted in the learning term.

Specifically, Z is obtained using data of the specific cut plate 8a of the Head portion which is a portion near the tip of the entire length of the rolled material 8₁ ^rotSo that the error of the predicted CT value of the cutting plate 8a becomes 0. At this time, Z₂ ^rotIs considered to be 0.

Using the data of the specific cut plate 8a of the Middle part, which is the part of the rolled material 8 under or after acceleration, to determine Z₂ ^rotSo that the error of the predicted CT value becomes 0. At this time, Z₁ ^rotThe value obtained in the Head section is used.

Z obtained₁ ^rotAnd Z₂ ^rotThe predicted value of all the cut pieces 8a is calculated by substituting the equation (4). The accuracy of the entire length of the rolled material 8 is improved by setting the prediction error between the Head portion and the Middle portion to 0.

According to embodiment 1 described above, the temperature control device 9 sets the water-cooling heat transfer coefficients in the accelerated cooling device 2 and the rollout table cooling device 3, respectively. Therefore, the accuracy of the temperature model can be improved.

The temperature control device 9 calculates a learning value for correcting the predicted value of the temperature of the rolled material 8 based on the difference between the predicted value of the temperature of the rolled material 8 after cooling predicted by the temperature model and the actual measured value of the actual temperature. Therefore, the accuracy of the temperature model can be further improved.

The temperature control device 9 calculates a learning value for correcting the predicted value of the temperature of the rolled material 8 based on the MT actual result value. Therefore, the accuracy of the temperature model can be further improved.

Further, when the water injection valve 2b around the intermediate thermometer 6 is opened, the state in which the cooling water covers the surface of the rolled material 8 can be maintained immediately below the intermediate thermometer 6. Therefore, in the intermediate thermometer 6, the surface temperature of the rolled material 8 may not be accurately measured. In this case, by closing all the water injection valves 2b in the section 2a close to the intermediate thermometer 6, the surface of the rolled material 8 can be prevented from being covered with the cooling water immediately below the coiling thermometer 7. As a result, the intermediate thermometer 6 can accurately measure the surface temperature of the rolled material 8. When it is difficult to close all the water injection valves 2b in the section 2a close to the intermediate thermometer 6, it is sufficient to preferentially close the water injection valves 2b closer to the intermediate thermometer 6.

Next, an example of the temperature control device 9 will be described with reference to fig. 7.

Fig. 7 is a hardware configuration diagram of a temperature control device of a hot rolling line in embodiment 1.

The various functions of the temperature control device 9 may be implemented by processing circuitry. For example, the processing circuit is provided with at least one processor 100a and at least one memory 100 b. For example, the processing circuit is provided with at least one dedicated hardware 200.

In the case where the processing circuit includes at least one processor 100a and at least one memory 100b, the respective functions of the temperature control device 9 are realized by software, firmware, or a combination of software and firmware. At least one of the software and the firmware is described as a program. At least one of the software and the firmware is stored in the at least one memory 100 b. The at least one processor 100a reads out and executes the program stored in the at least one memory 100b, thereby realizing each function of the temperature control device 9. The at least one processor 100a is also referred to as a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, or a DSP. For example, the at least one memory 100b is RAM, ROM, flash memory, EPROM, EEPROM, etc., a non-volatile or volatile semiconductor memory, a magnetic disk, a floppy disk, an optical disk, a compact disk, a mini disk, a DVD, etc.

In case the processing circuit is provided with at least one dedicated hardware 200, the processing circuit is for example realized by a single circuit, a complex circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof. For example, the respective functions of the temperature control device 9 are realized by the processing circuit. For example, the respective functions of the temperature control device 9 are collectively realized by a processing circuit.

The functions of the temperature control device 9 may be partially implemented by dedicated hardware 200, and the other parts may be implemented by software or firmware. For example, the functions of the control unit 9c may be realized by a processing circuit as dedicated hardware 200, and the functions other than the functions of the control unit 9c may be realized by at least one processor 100a reading and executing a program stored in at least one memory 100 b.

In this manner, the processing circuitry implements the functions of the temperature control device 9 via hardware 200, software, firmware, or a combination thereof.

Embodiment 2.

Fig. 8 is a diagram showing a predicted value and an actual result value (a predicted value again) of a temperature change of each cut plate in the run-out table cooling apparatus to which the temperature control apparatus of the hot rolling line according to embodiment 2 is applied. The same or corresponding portions as those in embodiment 1 are denoted by the same reference numerals. The description of this part is omitted.

As shown in fig. 8, in embodiment 2, when each cut slab 8a passes directly below the intermediate temperature gauge 6 during cooling of the rolled material 8 and when there is a prediction error of the temperature model between the MT predicted value and the MT actual result value of the cut slab 8a, the temperature change of the rolled material 8 inside the run-out table cooling apparatus 3 is calculated again after correcting the start point (MT) inside the run-out table cooling apparatus 3 to the MT actual result valueTo reach the CT target value. The reference value (V) of the amount of cooling water to each zone 3a is corrected₁ ^rot，V₂ ^rot，···V_M ^rot) To achieve the recalculated predicted value.

According to the embodiment 2 described above, when there is a prediction error of the temperature model between the actual result value of the temperature of the rolled material 8 measured by the intermediate thermometer 6 and the predicted value of the temperature, the temperature control device 9 controls the water injection valve 3b of the run-out table cooling device 3 so as to compensate for the error. Therefore, the accuracy of the temperature model can be further improved.

When there is an error in the temperature model between the actual temperature result value and the predicted temperature value of the rolled material 8 measured by the intermediate thermometer 6, the temperature control device 9 recalculates the predicted value of the temperature change of the rolled material 8 in the run-out table cooling device 3 using the actual temperature result value of the rolled material 8 measured by the intermediate thermometer 6 as an initial value. Therefore, the accuracy of the temperature model can be further improved.

Embodiment 3.

Fig. 9 is a diagram showing a predicted value and an actual result value (a predicted value again) of a temperature change of each cut plate in an accelerated cooling equipment to which a temperature control apparatus of a hot rolling line in embodiment 3 is applied. Fig. 10 is a diagram showing a predicted value and an actual result value (a predicted value again) of a temperature change of each cut plate in the run-out table cooling apparatus to which the temperature control apparatus of the hot rolling line according to embodiment 1 is applied. The same or corresponding portions as those in embodiment 1 are denoted by the same reference numerals. The description of this part is omitted.

In embodiment 3, a test for identifying the cooling efficiency of the accelerated cooling device 2 and the run-out table cooling device 3 used alone was performed in advance. The cooling efficiency (c/value) of the average one valve of the accelerated cooling device 2 and the run-out table cooling device 3 is calculated based on the actual result of the temperature drop (c) obtained by subtracting the CT actual result value from the FDT actual result value of each cutting plate 8a and the number of open water injection valves. The speed pattern of the rolled material 8 at this time is the same as that in the normal rolling.

Here, the cooling efficiency of the accelerated cooling equipment 2 is defined as a (k) (° c/valve). The cooling efficiency of the run-out table cooling apparatus 3 was b (k) (DEG C/valve). The number of water injection valves 2b used in the accelerated cooling equipment 2 is a (k) (valid). The number of water injection valves 3b used in the run-out table cooling apparatus 3 is b (k) (valid). k is the number of the cutting plate 8 a.

In this case, the predicted value of the temperature drop of the accelerated cooling equipment 2 is a (k) × a (k) (° c). The predicted value of the temperature drop of the run-out table cooling apparatus 3 is b (k) x B (k) (. degree.C.).

The actual temperature drop of each cutting plate 8a by the accelerated cooling equipment 2 is calculated by the following expression (5).

[ FORMULA 5 ]

The actual temperature drop of each cut plate 8a by the run-out table cooling device 3 is calculated by the following expression (6).

[ formula 6 ]

As shown in fig. 9, the accelerated cooling equipment 2 recalculates the predicted values on the input/output side of each section 2a, using the value obtained by subtracting the value expressed by the expression (5) from the FDT actual result value as the MT actual result value.

As shown in fig. 10, the run-out table cooling apparatus 3 calculates the predicted values on the input/output side of each block 3a again by using the MT actual result value as an initial value and subtracting the value represented by the expression (6) from the initial value as the CT actual result value.

According to the embodiment 3 described above, the temperature control device 9 calculates the average cooling efficiency of one valve from the cooling efficiency obtained by the identification experiment using the accelerated cooling equipment 2 alone, the actual result value of the temperature decrease of the rolled material 8 from the upstream side to the downstream side of the accelerated cooling equipment 2 and the run-out table cooling equipment 3, and the number of the ejectors used in the accelerated cooling equipment 2. The temperature control device 9 calculates the average cooling efficiency of one valve from the cooling efficiency obtained by the identification experiment using the run-out table cooling device 3 alone, the actual result value of the temperature drop of the rolled material 8 from the upstream side to the downstream side of the accelerated cooling device 2 and the run-out table cooling device 3, and the number of ejectors used in the run-out table cooling device 3. Therefore, the accuracy of the temperature model can be further improved.

The temperature control device 9 may calculate the cooling efficiency of the accelerated cooling device 2, the rollout table cooling device 3, and the cooling efficiency using the ratio of the accelerated cooling device 2 to the rollout table cooling device 3. In this case, the accuracy of the temperature model can be further improved.

Embodiment 4.

Fig. 11 is a diagram showing a predicted value and an actual result value (a predicted value again) of a temperature change of each cut plate in an accelerated cooling equipment to which a temperature control apparatus of a hot rolling line according to embodiment 4 is applied. Fig. 12 is a diagram showing a predicted value and an actual result value (a predicted value again) of a temperature change of each cut plate in the run-out table cooling apparatus to which the temperature control apparatus of the hot rolling line according to embodiment 4 is applied. The same or corresponding portions as those in embodiment 1 are denoted by the same reference numerals. The description of this part is omitted.

In embodiment 4, an experiment for identifying the cooling efficiency of the accelerated cooling device 2 and the run-out table cooling device 3 used alone was performed in advance. Based on the actual temperature drop value (DEG C), which is the value obtained by subtracting the actual CT value from the actual FDT value of each cutting plate 8a, and the injector flow rate (m) of the opened valve³H) calculating the cooling efficiency (DEG C/m) of the average one valve of the accelerated cooling device 2 and the run-out table cooling device 3³H). The speed pattern of the rolled material 8 at this time is the same as that in the normal rolling.

Here, the cooling efficiency of the accelerated cooling device 2 is set to α(k)(℃/m³H). The cooling efficiency of the run-out table cooling apparatus 3 was set to β (k) (° c/m)³H). The number of water injection valves 2b used in the accelerated cooling equipment 2 is a (k) (valid). The number of water injection valves 3b used in the run-out table cooling apparatus 3 is b (k) (valid). The injector flow rate of the average one water injection valve 2b in the accelerated cooling device 2 is set to P_a(m³H/valid). Let the injector flow rate of one water injection valve 3b on average in the run-out table cooling device 3 be P_b(m³/h/valve)。

In this case, the predicted value of the temperature drop of the accelerated cooling equipment 2 is α (k) × a (k) × Pa (° c). The predicted value of the temperature drop of the run-out table cooling apparatus 3 is β (k) × B (k) × P_b(℃)。

The actual temperature drop of the accelerated cooling equipment 2 for each cutting plate 8a is calculated by the following equation (7).

[ formula 7 ]

The actual temperature drop of the run-out table cooling apparatus 3 for each cut plate 8a is calculated by the following expression (8).

[ formula 8 ]

As shown in fig. 11, the accelerated cooling equipment 2 recalculates the predicted values on the input/output side of each section 2a, using the value obtained by subtracting the value expressed by the expression (7) from the FDT actual result value as the MT actual result value.

As shown in fig. 12, the run-out table cooling apparatus 3 calculates the predicted values on the input/output side of each block 3a again by using the MT actual result value as an initial value and subtracting the value represented by the expression (8) from the initial value as the CT actual result value.

According to the embodiment 4 described above, the temperature control device 9 calculates the average cooling efficiency of one valve from the cooling efficiency obtained by the identification experiment using the accelerated cooling device 2 alone, the actual result value of the temperature decrease of the rolled material 8 from the upstream side to the downstream side of the accelerated cooling device 2 and the run-out table cooling device 3, and the volume of the ejector flow rate used in the accelerated cooling device 2. The temperature control device 9 calculates the cooling efficiency of one valve on average from the cooling efficiency obtained by the identification experiment using the run-out table cooling device 3 alone, the actual result value of the temperature drop of the rolled material 8 from the upstream side to the downstream side of the accelerated cooling device 2 and the run-out table cooling device 3, and the volume of the ejector flow rate used in the run-out table cooling device 3. Therefore, the accuracy of the temperature model can be further improved.

The temperature control device 9 according to any one of embodiments 1 to 4 may be applied to a hot rolling line in which the accelerated cooling device 2 is provided downstream of the run-out table cooling device 3. In this case, the accuracy of the temperature model can be improved.

Industrial applicability of the invention

As described above, the temperature control device of the hot rolling line according to the present invention can be used in a hot rolling system.

Description of the reference numerals

1 finishing mill, 2 accelerated cooling device, 2a section, 2b water injection valve, 2c nozzle, 3 run-out roller cooling device, 3a section, 3b water injection valve, 3c nozzle, 4 coiler, 5 finishing mill outlet side thermometer, 6 middle thermometer, 7 coiling thermometer, 8 rolling material, 8a cutting plate, 9 temperature control device, 9a accelerated side calculation part, 9b run-out roller side calculation part, 9c control part, 10 roller way, 100a processor, 100b memory, 200 hardware.