JP6939713B2 - Steel plate temperature control device for hot endless rolling line - Google Patents

Description

The present invention relates to a steel plate temperature control device for a hot endless rolling line in which steel sheets flow in the order of a rough rolling mill, an induction heating device, and a finish rolling mill. The present invention relates to a steel plate temperature control device to be controlled.

In the hot rolling process, high-temperature steel sheet slabs heated to a required temperature in a slab heating furnace are conveyed on a line, rolled in sequence, and finally wound up by a coiler. Due to the sophistication and diversification of product specifications in recent years, the guaranteed range of target temperature at each point on the rolling line represented by finish inlet temperature, finish exit temperature, take-up temperature, etc. is even greater than before. It's getting tougher.

An induction heating device has been introduced to control the temperature of the steel sheet in the hot rolling process. The heating by the induction heating device utilizes the Joule loss caused by the eddy current flowing so as to cancel the magnetic flux interlinking with the steel sheet. The induction heating device is energy efficient because it is directly heated, and the production amount can be expected to be improved because it is rapidly heated. The calorific value of the steel sheet by the induction heating device changes depending on the thickness, width, and speed of the steel sheet. Therefore, in the temperature control of the steel sheet by the induction heating device, the output of the induction heating device is set according to the plate thickness, the plate width, and the speed of the steel plate in order to achieve the target steel plate temperature or the heating temperature. There is.

By the way, in order to improve the yield in hot rolling and stable rolling of thin materials, endless rolling is performed by a rolling line in which a continuous casting machine and a mill are directly connected. In endless rolling, a high-temperature steel plate slab extracted from a continuous casting machine is conveyed on a line, rolled in sequence, cut to a coil length in front of a coiler, and wound. In such endless rolling, the inter-run plate thickness may be changed by changing the plate thickness of the steel plate between runs. When the inter-running plate thickness is changed, a tapered portion in which the plate thickness changes continuously is generated between the plate thickness change start point and the plate thickness change end point.

The tapered portion of the steel sheet is a portion that is finally cut and does not become a product. However, this does not mean that temperature control for the tapered portion is unnecessary. As a matter of course, the tapered portion is connected to the front and rear steel plates, and if the temperature of the tapered portion is not controlled, the quality of the steel plates before and after the tapered portion, that is, the part to be a product, is adversely affected. In order to minimize the part to be finally cut, the tapered part is also required to have the same strict temperature control as the part to be a product.

Patent Document 1 discloses a method for controlling the temperature of a steel sheet in endless rolling in which the tail end of a leading material and the tip of a trailing material are joined. According to the method disclosed in Patent Document 1, based on the relationship between the heating efficiency and the plate thickness, the plate thickness near the joint is set so as to reach the target temperature on the exit side of the finish rolling mill, and the plate is heated by the induction heating device. Is done.

However, the method disclosed in Patent Document 1 is a method in which a tapered portion does not occur in the steel sheet before and after the change in the running plate thickness. In endless rolling in which a continuous casting machine and a mill are directly connected, when the plate thickness of a steel plate is changed to a tapered shape by changing the plate thickness between running sheets, the method disclosed in Patent Document 1 cannot be applied as it is.

Japanese Unexamined Patent Publication No. 2000-271607

The present invention has been made in view of the above-mentioned problems, and when the inter-run sheet thickness is changed during endless rolling, the temperature of the tapered portion of the steel sheet is appropriately adjusted. It is an object of the present invention to provide a steel sheet temperature control device for a hot endless rolling line, which can improve the product quality in the vicinity of the tapered portion by controlling the temperature.

The steel sheet temperature control device for the hot endless rolling line according to the present invention induces and heats the temperature of the steel sheet entering the finish rolling mill in the hot endless rolling line in which the steel sheet flows in the order of the rough rolling mill, the induction heating device, and the finish rolling mill. It is a steel sheet temperature control device that is controlled by the output of the device. The steel plate temperature control device for the hot endless rolling line according to the present invention is a taper plate thickness calculation process and an induction heating device described in detail below when the inter-run plate thickness is changed by changing the plate thickness of the steel plate between runs. It is characterized by executing output calculation processing.

The taper portion plate thickness calculation process is a process of calculating the plate thickness of the taper portion of the steel plate caused by the plate thickness changing operation of the rough rolling mill. For example, if the target plate thickness of the steel plate before and after the change in the running plate thickness, the set length of the tapered portion, and the transport speed of the steel plate are known, the plate thickness of the tapered portion passing through the induction heating device is expressed as a function of time. be able to. In the taper portion plate thickness calculation process, for example, a plate thickness that continuously changes from the start point to the end point of the tapered portion may be calculated. Alternatively, in the taper portion plate thickness calculation process, only the plate thickness at the start point and the end point of the taper portion may be calculated. Further, in the taper portion plate thickness calculation process, a plurality of intermediate target points are set in the rolling direction of the tapered portion, and in addition to the plate thicknesses at the start point and end point of the tapered portion, the plate thickness at each intermediate target point is calculated. You may.

The induction heating device output calculation process is a process of calculating the output of the induction heating device when the tapered portion passes through the induction heating device. This calculation uses a map or function that defines the relationship between the plate thickness of the steel plate to achieve the target temperature or the target temperature rise amount and the output of the induction heating device, and the taper calculated by the taper plate thickness calculation process. It is done based on the plate thickness of the part. The output of the induction heating device calculated by the induction heating device output calculation process is set for the induction heating device control device that controls the induction heating device.

By executing the taper portion thickness calculation process and the induction heating device output calculation process of the above contents, the taper portion that continuously changes the output of the induction heating device when the tapered portion of the steel sheet passes through the induction heating device. It can be appropriately controlled according to the plate thickness of.

In the induction heating device output calculation process, even if the output of the induction heating device when the tapered portion passes through the induction heating device is calculated based on the plate thickness at the start point of the tapered portion and the plate thickness at the end point of the tapered portion. good. Induction heating device when the tapered part passes through the induction heating device based on the plate thickness at the start point and end point of the taper part as well as the plate thickness at a plurality of intermediate target points set in the rolling direction of the taper part. The output of may be calculated.

In the induction heating device output calculation process, the output of the induction heating device is output from the output of the induction heating device according to the plate thickness at the start point of the tapered portion to the output of the induction heating device according to the plate thickness at the end point of the tapered portion. It may be changed continuously. Alternatively, in the induction heating device output calculation process, the output of the induction heating device according to the plate thickness at the start point of the tapered portion is changed to the output of the induction heating device according to the plate thickness at the end point of the tapered portion. The output may be varied stepwise.

In the induction heating device output calculation process, the output of the induction heating device may be corrected according to the temperature condition of the steel plate entering the induction heating device. For example, if the temperature of the steel sheet is controlled using the target temperature, the actual temperature on the side of the steel sheet is collected from the thermometer installed on the upstream side of the induction heating device, and the temperature of the steel sheet, which is the premise of the map or function, is inserted. The output of the induction heating device may be corrected according to the deviation between the side planned temperature and the incoming side actual temperature. If the temperature of the steel sheet is controlled using the target temperature rise amount, the actual temperature rise amount on the entry side of the steel sheet is collected from the thermometer installed on the upstream side of the induction heating device, and the steel sheet is the premise of the map or function. The output of the induction heating device may be corrected according to the deviation between the planned temperature rise amount on the entrance side and the actual temperature rise amount on the entrance side.

In the induction heating device output calculation process, the output of the induction heating device may be corrected according to the temperature condition of the steel plate output from the induction heating device. For example, if the temperature of the steel sheet is controlled using the target temperature, the actual temperature on the exit side of the steel sheet is collected from the thermometer installed on the downstream side of the induction heating device, and the deviation between the target temperature and the actual temperature on the exit side is obtained. The output of the induction heating device may be corrected accordingly. If the temperature of the steel sheet is controlled using the target temperature rise amount, the target temperature rise amount and the output side actual temperature increase are collected from the thermometer installed on the downstream side of the induction heating device. The output of the induction heating device may be corrected according to the deviation from the temperature.

According to the steel plate temperature control device for the hot endless rolling line according to the present invention, the output of the induction heating device when the tapered portion of the steel sheet passes through the induction heating device depends on the plate thickness of the continuously changing tapered portion. Can be controlled appropriately. As a result, the target temperature or the target temperature rise amount can be achieved in the tapered portion of the steel sheet entering the finish rolling mill, and the product quality in the vicinity of the tapered portion can be improved.

It is a figure which shows an example of the structure of a hot endless rolling line. It is a figure which shows typically the mode that the plate thickness of a steel plate is changed by changing the plate thickness between running in endless rolling. It is a figure which shows the structure of the steel plate temperature control apparatus common to each embodiment of this invention. It is a figure explaining the induction heating apparatus output calculation process of Embodiment 1 of this invention. It is a figure explaining the induction heating apparatus output calculation process of Embodiment 2 of this invention. It is a figure explaining the induction heating apparatus output calculation process of Embodiment 3 of this invention. It is a figure explaining the induction heating apparatus output calculation process of Embodiment 3 of this invention. It is a figure explaining the induction heating apparatus output calculation process of Embodiment 4 of this invention. It is a figure explaining the induction heating apparatus output calculation process of Embodiment 5 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, when the number, quantity, quantity, range, etc. of each element is referred to in the embodiment shown below, the reference is made unless otherwise specified or clearly specified by the number in principle. The present invention is not limited to the number of cases. In addition, the structure described in the embodiments shown below is not necessarily essential to the present invention, except when explicitly stated or when it is clearly specified in principle.

1. 1. Configuration of Hot Endless Rolling Line First, a hot endless rolling line to which the steel sheet temperature control device according to the present invention is applied will be described. FIG. 1 is a diagram showing an example of the configuration of a hot endless rolling line. The steel plate 6 extracted from the continuous casting machine 1 is heated in the slab heating furnace 2 and extracted into a rolling line. The steel plate 6 that has passed through the edger 3 in the rolling line is thinly rolled to a desired thickness by the rough rolling mill 4 and the finish rolling mill 9, and at the same time, is processed into a desired width.

The rough rolling mill 4 is composed of one or a plurality of rolling stands, and rolls the steel plate 6 in one direction from upstream to downstream to bring the thickness and width of the steel plate 6 close to the product dimensions. The rough rolling mill 4 may be provided with a roughing side thermometer 5 for measuring the temperature of the steel sheet. The induction heating device 7 is installed on a line between the rough rolling mill 4 and the finishing rolling mill 9, and heats the steel plate 6 passing through the induction heating device 7.

The finish rolling mill 9 is composed of a plurality of rolling stands, rolls the steel plate 6 in one direction from upstream to downstream, and determines the final quality regarding dimensions such as plate thickness and plate width of the steel plate. The temperature of the steel sheet after finish rolling is measured by the finish side thermometer 10. Further, the finish-in side thermometer 8 may be installed between the induction heating device 7 and the finish rolling mill 9.

A cooling table 11 is installed downstream of the finish rolling mill 9. The cooling table 11 injects water into the steel plate 6 to lower the temperature of the steel plate 6. The steel plate 6 that has passed through the cooling table 11 is cut to a coil length by the shear 12 in front of the coiler and wound into a coil by the coiler 13.

When changing the running plate thickness of the steel plate 6 between runs, the roll gap of each rolling stand of the rough rolling mill 4 is changed stepwise, or the rough rolling mill 4 and the finish rolling mill 9 are used. The roll gap of each rolling stand is changed step by step, and the plate thickness is changed without stopping the operation. FIG. 2 is a diagram schematically showing how the plate thickness of the steel plate 6 is changed by changing the running plate thickness in endless rolling. As shown in FIG. 2, during the running plate thickness change, a portion where the plate thickness of the steel plate 6 continuously changes is generated between the stands due to the plate thickness changing operation of the rough rolling mill 4. The portion where this portion remains up to the protruding side of the final stand is the tapered portion 6a of the steel plate 6.

2. Configuration of Steel Sheet Temperature Control Device Next, the configuration of the steel sheet temperature control device common to each embodiment of the present invention will be described with reference to FIG. FIG. 3 is a diagram showing an example of the configuration of the steel sheet temperature control device. The hot endless rolling line is provided with a rolling setting device 15 for setting various parameters related to rolling. The rolling setting device 15 is, for example, a computer including at least one processor and at least one memory. When the program stored in the memory is executed by the processor, the rolling setting device 15 which is a computer functions as a steel sheet temperature control device.

The rolling setting device 15 as a steel plate temperature control device includes a plate thickness setting calculation unit 17 and an induction heating device output calculation unit 19. The plate thickness setting calculation unit 17 includes a running plate thickness change calculation unit 16. These calculation units 16, 17, and 19 do not exist as hardware, but are realized by software by a program stored in the memory of the rolling setting device 15. Hereinafter, the functions of the calculation units 16, 17, and 19 constituting the rolling setting device 15 as the steel sheet temperature control device will be described.

The rolling setting device 15 communicates with the host computer 30. The host computer 30 includes a target plate thickness setting unit 31 for setting a target plate thickness of the steel plate 6 and a target temperature setting unit 32 for setting a target temperature of the steel plate. The target plate thickness and target temperature are set based on the product specifications and required quality. However, the target temperature setting unit 32 may set a target temperature rise amount instead of the target temperature. The amount of temperature rise means the temperature relative to the reference temperature.

The plate thickness setting calculation unit 17 of the rolling setting device 15 receives the target plate thickness from the target plate thickness setting unit 31, and calculates the plate thickness setting value based on the received target plate thickness. When changing the running plate thickness, the plate thickness setting calculation unit 17 receives the target plate thickness after the plate thickness change from the target plate thickness setting unit 31, and the inter-run plate thickness change calculation unit 16 receives the target plate thickness between runs. Calculate the amount of plate thickness change at each stand when changing plate thickness. Then, a rolling path schedule is created from the amount of change in plate thickness at each stand, and the rolling path schedule is transmitted to the rolling mill control device 21. The rolling mill control device 21 controls the operation of each stand of the rough rolling mill 4 and the finish rolling mill 9 according to the rolling path schedule.

Further, the plate thickness setting calculation unit 17 transmits the plate thickness setting value to the induction heating device output calculation unit 19. When changing the running plate thickness, the running plate thickness change calculation unit 16 performs a taper portion plate thickness calculation process for calculating the plate thickness of the tapered portion 6a of the steel plate 6 caused by the change in the running plate thickness, and tapers. The plate thickness information regarding the plate thickness of the unit 6a is transmitted to the induction heating device output calculation unit 19. The plate thickness information of the tapered portion 6a transmitted from the inter-running plate thickness change calculation unit 16 includes, for example, the position and thickness of the start point of the tapered portion 6a and the position and plate thickness of the end point of the tapered portion 6a. ..

The induction heating device output calculation unit 19 receives the target temperature or the target temperature rise amount from the target temperature setting unit 32, and also receives the target plate thickness from the plate thickness setting calculation unit 17. When changing the running plate thickness, the plate thickness information of the tapered portion 6a is received from the running plate thickness change calculation unit 16. The induction heating device output calculation unit 19 uses a map or a function that defines the relationship between the thickness of the steel plate 6 and the output of the induction heating device 7 for achieving the target temperature or the target temperature rise amount, and the induction heating device 7 Calculate the output (power) of. When changing the running plate thickness, the induction heating device 7 when the tapered portion 6a passes through the induction heating device 7 based on the plate thickness information of the taper portion 6a received from the running plate thickness change calculation unit 16. Calculate the output. The induction heating device output calculation unit 19 sets the calculated output of the induction heating device 7 with respect to the induction heating device control device 22.

In each of the following embodiments, the details of the induction heating device output calculation process performed by the induction heating device output calculation unit 19 will be described.

3. 3. Induction heating device output calculation process of the first embodiment FIG. 4 is a diagram illustrating the induction heating device output calculation process of the first embodiment of the present invention. In the upper graph of FIG. 4, when the induction heating device 7 passes through the tapered portion 6a of the steel plate 6, the change in the plate thickness h at a predetermined position in the induction heating device 7 with time is drawn, and the lower graph shows the change. Is drawn a change in the output p of the induction heating device 7 with time.

In the example shown in FIG. 4, the plate thickness h at a predetermined position in the induction heating device 7 changes from h _{0 to h 1.} The output p of the induction heating device 7 capable of achieving the target temperature or the target temperature rise amount becomes smaller as the plate thickness h becomes thinner. In the example shown in FIG. 4, the output p _{0 corresponds to the plate thickness h 0} before the change in the inter-run plate thickness, and the output p ₁ corresponds to _{the plate thickness h 1} after the change in the inter-run plate thickness. The portion corresponding to the time t ₀ when the plate thickness h starts to change is the start point of the tapered portion 6a, and _{the portion corresponding to the time t 1} when the plate thickness h starts to change is the end point of the tapered portion 6a. The plate thickness h of the tapered portion 6a continuously changes from h _{0 to h 1.}

In the induction heating device output calculation process of the present embodiment, the tapered portion 6a passes through the induction heating device 7 based on _{the plate thickness h 0 at} the start point of the tapered portion 6a and the plate thickness h _{1 at the ending point of the tapered portion 6a.} The output p of the induction heating device 7 is calculated. Specifically, the output p of the induction heating device 7 is changed from the output p ₀ corresponding to the plate thickness h _{0 at the start point of the tapered portion 6a to the output p 1 corresponding to the plate thickness h 1} at the end point of the tapered portion 6a. Is continuously changed at a constant speed. There is a response delay between the time when the output of the induction heating device 7 is changed and the time when the temperature of the steel sheet 6 changes. The start time for changing the output of the induction heating device 7 is determined based on the traveling position of the tapered portion 6a on the line and the response delay.

4. Induction heating device output calculation process of the second embodiment FIG. 5 is a diagram illustrating the induction heating device output calculation process of the second embodiment of the present invention. In the upper graph of FIG. 5, the change of the plate thickness h at a predetermined position in the induction heating device 7 when the tapered portion 6a of the steel plate 6 passes through the induction heating device 7 is drawn, and the lower graph shows the change with time. Is drawn a change in the output p of the induction heating device 7 with time.

In the example shown in FIG. 5, the plate thickness h at a predetermined position in the induction heating device 7 continuously changes from h _{0 to h 1 as} in the example shown in FIG. In the induction heating device output calculation process of the present embodiment, _{in addition to the plate thickness h 0 at the start point of the tapered portion 6a and the plate thickness h 1 at} the end point of the tapered portion 6a, the thickness is set in the rolling direction of the tapered portion 6a. The output p of the induction heating device 7 when the tapered portion 6a passes through the induction heating device 7 is calculated based on the plate thickness at the plurality of intermediate target points.

The intermediate target point is a portion of the tapered portion 6a corresponding to a plurality of arbitrary times t _c0 and t _{c1 between the start time t 0} and the end time t _1. The induction heating device 7 capable of calculating the plate thicknesses h _c0 and h _{c1 at the times t c0} and t _c1 of each intermediate target point and achieving the target temperature or the target temperature rise amount by using the above-mentioned map or function. Calculate the outputs p _c0 and p _c1. The output p of the induction heating device between the start point and the intermediate target point of the tapered portion 6a, between the intermediate target points, and between the intermediate target point and the end point of the tapered portion 6a is calculated by linear approximation.

5. Induction heating device output calculation process of the third embodiment FIGS. 6 and 7 are diagrams for explaining the induction heating device output calculation process of the third embodiment of the present invention. In the upper graphs of FIGS. 6 and 7, when the induction heating device 7 passes through the tapered portion 6a of the steel plate 6, the change in the plate thickness h at a predetermined position in the induction heating device 7 with time is drawn, and the lower graph shows. In the graph of, the change of the output p of the induction heating device 7 with time is drawn.

In the examples shown in FIGS. 6 and 7, the plate thickness h at a predetermined position in the induction heating device 7 continuously changes from h _{0 to h 1 as} in the example shown in FIG. In the induction heating device output calculation process of the present embodiment, _{the output p 0} of the induction heating device 7 corresponding to _{the plate thickness h 0 of the start point of the tapered portion 6a corresponds to the plate thickness h 1} of the end point of the tapered portion 6a. The output p of the induction heating device 7 is changed stepwise to _{the output p 1 of the induction heating device 7.}

In the example shown in FIG. 6, at the start time t ₀ of the tapered portion 6a, the output p of the induction heating device 7 is changed from the output p _{0 according to the plate thickness h 0.} After that, go gradually changing the output p of the induction heating device 7, at the end time t ₁ of the tapered portion 6a, it is changed to output p ₁ corresponding to the thickness h _1. In the example shown in FIG. 7, the output p _{0 corresponding to the plate thickness h 0} at the start point of the tapered portion 6a is maintained _{until a time after the start time t 0 of the tapered portion 6a.} After that, the output p of the induction heating device 7 is changed stepwise, and the output p _{1 corresponding to the plate thickness h 1} of the end point of the tapered portion 6a at a time before the _{end time t 1 of the tapered portion 6a.} Change to. The number of steps when the output p of the induction heating device 7 is changed stepwise is not limited. However, the smaller the number of steps, the more likely it is that the temperature distribution of the tapered portion 6a will be uneven. Therefore, it is preferable that the number of steps is large.

6. Induction heating device output calculation process of the fourth embodiment FIG. 8 is a diagram illustrating the induction heating device output calculation process of the third embodiment of the present invention. The map or function used in the calculation of the output of the induction heating device 7 in the first embodiment is created on the premise of the planned temperature of the steel plate 6 when entering the induction heating device 7 (this is referred to as an entry side planned temperature). ing. However, due to factors such as individual differences in equipment, changes over time, variations in operating conditions, and variations in environmental conditions, the actual temperature of the steel sheet 6 when entering the induction heating device 7 (this is called the actual temperature on the entry side) is not always entered. It does not match the side planned temperature.

In the induction heating device output calculation process of the present embodiment, the output of the induction heating device 7 is controlled by using the actual temperature on the entry side during online operation. Specifically, induction entry side actual temperature T ^AF from the heating device 7 crude exit side thermometer 5 which is installed upstream of the steel sheet 6 is collected, and the entry side actual temperature T ^AF and entry side plan temperature T ^CAL comparison Will be done. _{Then, the correction output Δp FF} of the induction heating device 7 is calculated based on the deviation between the actual entry-side temperature T ^AF and the planned entry-side temperature T ^CAL. The correction output Δp _FF is set to a negative value when the incoming side actual temperature T ^AF is higher than the incoming side planned temperature T ^CAL , and is set to a negative value when the incoming side actual temperature T ^AF is lower than the incoming side planned temperature T ^CAL. It is considered to be a positive value. The final output is obtained by adding the correction output Δp _FF to the output p of the induction heating device 7 in the setting calculation.

In this embodiment, the actual temperature on the entry side is collected from the rough outlet side thermometer 5, but if the temperature control of the steel sheet is performed using the target temperature rise amount, the actual temperature on the entry side is replaced with the actual temperature on the entry side. It suffices to collect the actual temperature rise amount on the entrance side. In this case, the planned temperature rise amount on the entry side and the actual temperature rise amount on the entry side may be compared, and the correction output of the induction heating device 7 may be calculated according to the deviation.

7. Induction heating device output calculation process of the fifth embodiment FIG. 9 is a diagram illustrating the induction heating device output calculation process of the fifth embodiment of the present invention. The map or function used in the calculation of the output of the induction heating device 7 in the first embodiment is created so that the temperature of the steel plate 6 after passing through the induction heating device 7 becomes the target temperature. However, the actual temperature of the steel sheet 6 after passing through the induction heating device 7 (this is called the actual temperature at the exit side) is not always the target due to factors such as individual differences in equipment, changes over time, variations in operating conditions, and variations in environmental conditions. Does not match the temperature.

In the induction heating device output calculation process of the present embodiment, the output of the induction heating device 7 is controlled by using the actual temperature on the exit side during online operation. ^{Specifically, the actual outlet temperature T ACT of the} steel plate 6 is collected from the finish inlet thermometer 8 installed on the downstream side of the induction heating device 7, and the target temperature T ^TGT and the actual outlet temperature T ^ACT are compared. .. _{Then, the correction output Δp FB} of the induction heating device 7 is calculated based on the deviation between the target temperature T ^TGT and the actual output side temperature T ^ACT. Corrected output Delta] p _FB, when delivery side actual temperature ^{T ACT} is higher than the target temperature ^{T TGT} is a negative value, if the exit side actual temperature ^{T ACT} is lower than the target temperature ^{T TGT} and positive values Will be done. The final output is obtained by adding the corrected output Δp _FB to the output p of the induction heating device 7 in the setting calculation.

In the present embodiment, the actual temperature on the exit side is collected from the finish inlet thermometer 8, but if the temperature control of the steel sheet is performed using the target temperature rise amount, the actual temperature on the outlet side is used instead. It suffices to collect the actual temperature rise amount on the outgoing side. In this case, the actual temperature rise amount on the entry side and the target temperature rise amount may be compared, and the correction output of the induction heating device 7 may be calculated according to the deviation.

8. Other The induction heating device output calculation process of the fourth embodiment may be combined with any of the induction heating device output calculation processes of the first to third embodiments. Further, the induction heating device output calculation process of the fifth embodiment may be combined with any of the induction heating device output calculation processes of the first to fourth embodiments.

1 Continuous casting machine 2 Slab heating furnace 3 Edger 4 Rough rolling mill 5 Roughing side thermometer 6 Steel plate 7 Induction heating device 8 Finishing inlet side thermometer 9 Finishing rolling mill 10 Finishing exit side thermometer 11 Cooling table 12 Roller front shear 13 Roller 15 Rolling setting device as steel plate temperature control device 16 Running plate thickness change calculation unit 17 Plate thickness setting calculation unit 19 Induction heating device output calculation unit 21 Rolling machine control device 22 Induction heating device control device 30 Upper computer 31 Target plate thickness Setting unit 32 Target temperature setting unit

Claims (6)

A steel plate temperature control device that controls the temperature of the steel sheet entering the finish rolling machine by the output of the induction heating device in a hot endless rolling line in which steel sheets flow in the order of a rough rolling mill, an induction heating device, and a finish rolling mill. ,
When changing the inter-run plate thickness to change the plate thickness of the steel plate between runs
Tapered portion plate thickness calculation processing for calculating the plate thickness of the tapered portion of the steel plate caused by the plate thickness changing operation of the rough rolling mill, and
The taper calculated by the taper plate thickness calculation process using a map or function that defines the relationship between the plate thickness of the steel plate and the output of the induction heating device for achieving the target temperature or the target temperature rise amount. Based on the plate thickness of the portion, the induction heating device output calculation process for calculating the output of the induction heating device when the tapered portion passes through the induction heating device is executed .
In the induction heating device output calculation process, the induction heating device when the tapered portion passes through the induction heating device is based on the plate thickness at the start point of the tapered portion and the plate thickness at the end point of the tapered portion. A steel plate temperature control device for hot endless rolling lines, characterized in that the output is calculated. In the induction heating device output calculation process, the output of the induction heating device when the tapered portion passes through the induction heating device is also based on the plate thickness at a plurality of intermediate target points set in the rolling direction of the tapered portion. The steel plate temperature control device for a hot endless rolling line according to claim 1 , wherein the method is calculated. A steel plate temperature control device that controls the temperature of a steel sheet entering the finish rolling mill by the output of the induction heating device in a hot endless rolling line in which steel sheets flow in the order of a rough rolling mill, an induction heating device, and a finish rolling mill. ,
When changing the inter-run plate thickness to change the plate thickness of the steel plate between runs
Tapered portion plate thickness calculation processing for calculating the plate thickness of the tapered portion of the steel plate caused by the plate thickness changing operation of the rough rolling mill, and
The taper calculated by the taper plate thickness calculation process using a map or function that defines the relationship between the plate thickness of the steel plate and the output of the induction heating device for achieving the target temperature or the target temperature rise amount. Based on the plate thickness of the portion, the induction heating device output calculation process for calculating the output of the induction heating device when the tapered portion passes through the induction heating device is executed .
In the induction heating device output calculation process, the output of the induction heating device according to the plate thickness at the start point of the tapered portion is changed to the output of the induction heating device according to the plate thickness at the end point of the tapered portion. A steel plate temperature control device for a hot endless rolling line, which is characterized by continuously changing the output of an induction heating device. A steel plate temperature control device that controls the temperature of a steel sheet entering the finish rolling mill by the output of the induction heating device in a hot endless rolling line in which steel sheets flow in the order of a rough rolling mill, an induction heating device, and a finish rolling mill. ,
When changing the inter-run plate thickness to change the plate thickness of the steel plate between runs
Tapered portion plate thickness calculation processing for calculating the plate thickness of the tapered portion of the steel plate caused by the plate thickness changing operation of the rough rolling mill, and
The taper calculated by the taper plate thickness calculation process using a map or function that defines the relationship between the plate thickness of the steel plate and the output of the induction heating device for achieving the target temperature or the target temperature rise amount. Based on the plate thickness of the portion, the induction heating device output calculation process for calculating the output of the induction heating device when the tapered portion passes through the induction heating device is executed .
In the induction heating device output calculation process, the output of the induction heating device according to the plate thickness at the start point of the tapered portion is changed to the output of the induction heating device according to the plate thickness at the end point of the tapered portion. A steel plate temperature control device for a hot endless rolling line, characterized in that the output of an induction heating device is changed stepwise. A steel plate temperature control device that controls the temperature of a steel sheet entering the finish rolling mill by the output of the induction heating device in a hot endless rolling line in which steel sheets flow in the order of a rough rolling mill, an induction heating device, and a finish rolling mill. ,
When changing the inter-run plate thickness to change the plate thickness of the steel plate between runs
Tapered portion plate thickness calculation processing for calculating the plate thickness of the tapered portion of the steel plate caused by the plate thickness changing operation of the rough rolling mill, and
The taper calculated by the taper plate thickness calculation process using a map or function that defines the relationship between the plate thickness of the steel plate and the output of the induction heating device for achieving the target temperature or the target temperature rise amount. Based on the plate thickness of the portion, the induction heating device output calculation process for calculating the output of the induction heating device when the tapered portion passes through the induction heating device is executed .
In the induction heating device output calculation process, the incoming side actual temperature or the incoming side actual temperature rise amount of the steel sheet is collected from the thermometer installed on the upstream side of the induction heating device, and the map or the function as a premise of the above. The feature is that the output of the induction heating device is corrected according to the deviation between the planned entry-side temperature or the planned entry-side temperature rise of the steel sheet and the actual entry-side temperature or the actual entry-side temperature rise. Steel plate temperature control device for hot endless rolling lines. A steel plate temperature control device that controls the temperature of a steel sheet entering the finish rolling mill by the output of the induction heating device in a hot endless rolling line in which steel sheets flow in the order of a rough rolling mill, an induction heating device, and a finish rolling mill. ,
When changing the inter-run plate thickness to change the plate thickness of the steel plate between runs
Tapered portion plate thickness calculation processing for calculating the plate thickness of the tapered portion of the steel plate caused by the plate thickness changing operation of the rough rolling mill, and
The taper calculated by the taper plate thickness calculation process using a map or function that defines the relationship between the plate thickness of the steel plate and the output of the induction heating device for achieving the target temperature or the target temperature rise amount. Based on the plate thickness of the portion, the induction heating device output calculation process for calculating the output of the induction heating device when the tapered portion passes through the induction heating device is executed .
In the induction heating device output calculation process, the actual temperature on the exit side or the actual temperature rise on the exit side of the steel plate is collected from a thermometer installed on the downstream side of the induction heating device, and is combined with the target temperature or the target temperature rise amount. A steel plate temperature control device for a hot endless rolling line, characterized in that the output of the induction heating device is corrected according to a deviation from the actual output side temperature or the actual temperature rise on the output side.

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