JPH06508U - Heating control device for rolled material in hot rolling line - Google Patents

Abstract

(57) [Summary] [Purpose] To control the heating of a running rolling material such that the temperature is uniform at the entry side of the finishing rolling mill in the strip width and the longitudinal direction at the finish rolling start set temperature. [Structure] A cross section in which a portion corresponding to the central portion in the plate width direction of a rolled material S is constricted between a rough rolling mill R and a finish rolling mill F, and both end heating devices 1 having a plurality of both end heating coil devices. An overall heating device 2 in the plate width direction including a plurality of hourglass-shaped heating coil devices each having a drum-shaped tubular shape is provided. The arithmetic and control unit 4 determines the rolled material S based on the rolled material temperature measured by the scanning thermometer 3.
The power supply for heating the both ends in the plate width direction so that the temperature thereof is substantially equal to the temperature in the center part in the plate width direction is obtained, and the power supplied to both end heating devices 1 is controlled. Further, based on the temperature difference between the finish rolling start set temperature and the temperature in the central portion of the rolled material in the sheet width direction, the supply power for raising the temperature of the entire rolled material S in the sheet width direction to the set temperature is obtained. , Control the power supplied to the overall heating device 2 in the plate width direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rolled material heating device used in a hot rolling line of a steel manufacturing process, for example, a rolling device installed between a rough rolling mill and a finish rolling mill and running toward the finish rolling mill. The present invention relates to a heating control device for a rolled material in a hot rolling line, in which the temperature of the material can be controlled so as to reach a predetermined finish rolling start set temperature in a state where the temperature is uniform in the plate width and the longitudinal direction.

[0002]

[Prior art]

 In the hot rolling line of the steel manufacturing process, the temperature of the rolled material that is rolled by the rough rolling mill and is running toward the finishing rolling mill is lowered due to the heat radiation, especially at the both ends in the plate width direction. The temperature easily drops. Therefore, as a heating device to ensure a predetermined rolling material temperature, conventionally, a rolling material both-ends heating device equipped with a plurality of both-end heating coil devices or a gas heating type rolling material plate width direction entire heating device has been adopted. Has been done.

The rolling material both-ends heating device includes a plurality of both-ends heating coil devices arranged along the rolling line, and an inverter part for supplying electric power to the plurality of both-ends heating coil devices. The both ends of the rolled material in the plate width direction are heated by electromagnetic induction heating by means of heating coil devices at both ends. The heating coil device at both ends includes a heating coil arranged at each end of the rolled material in the plate width direction so as to surround the rolled material at a predetermined interval so as to surround the upper surface, the side surface, and the lower surface. And a heating coil support mechanism that supports each heating coil. The heating coil has an iron core and a winding through which an alternating current flows.

On the other hand, the gas heating type rolling material plate width direction overall heating device includes a heat insulating cover surrounding the upper part of the rolled material and lateral sides of both ends in the plate width direction, and a gas burner arranged on a side wall of the heat insulating cover. In addition, by heating with a gas burner using a gas burner, the entire width of the rolled material in the plate width direction is heated.

[0005]

[Problems to be solved by the device]

 By the way, in a hot rolling line, in order to homogenize the material and improve the yield, the rolling material that is running is stripped at the inlet side of the finish rolling mill or the forced cooling device arranged on the downstream side. It is important to control the heating so that the temperature reaches a predetermined set temperature evenly in the width and length directions. However, the above-mentioned rolling material both-ends heating device can electromagnetically heat both ends of the rolling material in the plate width direction during running to raise the temperature. However, for example, the heating control is not performed so as to reach the finish rolling start set temperature. Further, it is difficult to finely control the amount of heat input to the rolled material in the above-mentioned gas heating type rolling material plate widthwise entire heating device.

The present invention has been made in view of the above circumstances, in which a rolling material that is running on a hot rolling line has a temperature on the inlet side of a finish rolling mill or a forced cooling device, Alternatively, it is possible to control the heating of rolled material in a hot rolling line so that heating can be controlled so as to reach a predetermined set temperature evenly in the strip width and longitudinal directions at the entrance sides of the finish rolling mill and forced cooling device. For the purpose of provision.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, a heating control device for a rolled material in a hot rolling line according to the invention of claim 1 is arranged between a rough rolling mill and a finishing rolling mill, and runs toward the finishing rolling mill. The both ends of the rolled material, which is equipped with a plurality of heating coil devices at both ends along the rolling line, for electromagnetically heating both ends of the rolled material in the plate width direction. It is arranged on the entry side of the finishing rolling mill, and has a drum-shaped cross section with a constricted part corresponding to the center of the rolled material in the sheet width direction. Rolled material plate width direction overall heating device equipped with a plurality of drum-shaped heating coil devices for electromagnetic induction heating along the rolling line, and the temperature of the rolled material in the plate width direction is measured upstream of the rolling material both end heating device. Scanning thermometer and the scanning thermometer Based on the temperature difference between the measured center temperature in the width direction of the rolled material and the temperature at both ends in the width direction of the rolled material sheet, both end portions of the rolled material in the width direction are applied to the heating device at both ends of the rolled material. Power is calculated to raise the temperature so that the temperature becomes approximately equal to the temperature in the center of the strip width direction, and the power supplied to the heating device at both ends of the rolled material is controlled based on the power supply setting value Based on the temperature difference between the finish rolling start set temperature obtained and the temperature at the central portion in the width direction of the rolled material plate measured by the scanning thermometer, the plate of the rolled material applied to the overall heating device in the width direction of the rolled material plate. Calculation of the power supply to raise the temperature in the entire width direction so that the temperature becomes the above set temperature, and the operation to control the power supply to the above-mentioned rolling material plate width direction entire heating device based on the power supply setting value. And a control means.

The heating control device for the rolled material in the hot rolling line according to the invention of claim 2 is arranged between the finish rolling mill and the forced cooling device on the downstream side thereof, and runs toward the forced cooling device. Both ends of the rolled material that are equipped with a plurality of both end heating coil devices for electromagnetic induction heating both ends of the rolled material along the rolling line, and a downstream side of the both ends of the rolled material. It is arranged on the inlet side of the forced cooling device and has a cylindrical shape with a drum-shaped cross section in which the part corresponding to the center of the rolled material in the plate width direction is constricted. A rolling material plate width direction overall heating device equipped with a plurality of drum-shaped heating coil devices for induction heating along the rolling line, and the temperature in the plate width direction of the rolled material is measured on the upstream side of the rolling material both ends heating device. With a scanning thermometer and the scanning thermometer Based on the temperature difference between the central temperature in the width direction of the rolled material and the temperature at both ends in the width direction of the rolled material, the both ends of the rolled material in the width direction are fed to the heating device for both ends of the rolled material. Determine the power supply to raise the temperature so that the temperature is approximately equal to the center temperature in the strip width direction, and control the power supply to the above-mentioned rolling material both-end heating device based on the power supply setting value Based on the temperature difference between the forced cooling start set temperature and the temperature of the central portion of the rolled material strip in the width direction measured by the scanning thermometer, the strip width of the rolled material given to the overall heating device in the width direction of the rolled material is given. Calculation control to determine the power supply to raise the temperature in the whole direction so that the temperature becomes the above set temperature, and to control the power supply to the whole heating device in the width direction of the strip based on the power supply setting value. Means and are provided.

A heating control device for a rolled material in a hot rolling line according to the invention of claim 3 is arranged between a rough rolling mill and a finish rolling mill, and is a rolled material running toward the finish rolling mill. A first rolled material both-ends heating device equipped with a plurality of both-ends heating coil devices for electromagnetically heating both ends in the plate width direction of the sheet, and at a downstream side of the first rolled material both-ends heating device. Therefore, it is arranged on the entry side of the finishing rolling mill and has a drum-shaped cross section with a narrowed portion corresponding to the center of the rolled material in the sheet width direction. A drum-shaped heating coil for electromagnetic induction heating, a first rolling material plate widthwise entire heating device provided with a plurality of devices along a rolling line, and a plate of rolling material on the upstream side of the first rolling material both-ends heating device A first scanning thermometer for measuring the temperature in the width direction, and a finishing rolling mill Is installed between the forced cooling device on the downstream side of the machine and the both end heating coil device that electromagnetically heats both ends in the plate width direction of the rolled material running toward the forced cooling device along the rolling line. A plurality of second rolled material both-end heating devices provided and a downstream side of the second rolled material both-end heating device and an inlet side of the forced cooling device are arranged at the central portion in the plate width direction of the rolled material. A second drum equipped with a plurality of hourglass-shaped heating coil devices along the rolling line that form an hourglass-shaped tubular section with a constricted corresponding portion and that electromagnetically heats the entire strip width direction running inside the tube. And a second scanning thermometer for measuring the temperature of the rolled material in the plate width direction on the upstream side of the second rolled material both ends heating device. Rolling strip width center temperature and rolling strip width measured by scanning thermometer Based on the temperature difference from the temperature at both ends of the rolled material, the both ends of the rolled material in the strip width direction, which are applied to the first rolling material both ends heating device, are heated so that the temperature becomes substantially equal to the temperature at the center of the strip width direction. The supply power for warming is calculated, and the supply power to the first rolling material both-ends heating device is controlled based on the supply power setting value, and the predetermined finish rolling start set temperature and the first finish rolling start temperature are set. Based on the temperature difference from the central portion temperature of the rolled material strip width direction measured by the scanning thermometer, the temperature of the entire rolled material strip width direction applied to the first rolled material strip width direction overall heating device Determines the supply power for raising the temperature to reach the finish rolling start set temperature, and controls the supply power to the first rolling strip plate width direction overall heating device based on the supply power setting value, while The pressure measured by the second scanning thermometer Based on the temperature difference between the central temperature in the width direction of the strip and the temperature at both ends in the width direction of the strip, the temperature of both ends of the strip in the width direction applied to the second heating device for both ends of the strip The supply power for raising the temperature so as to be approximately equal to the temperature in the central portion in the strip width direction is obtained, and the supply power to the second rolling material both-ends heating device is controlled on the basis of the supply power setting value, and is determined in advance. Based on the temperature difference between the forced cooling start set temperature obtained and the temperature at the central portion in the width direction of the rolled material sheet measured by the second scanning thermometer, to the second heating apparatus for the entire width direction of the rolled material sheet. Determine the power supply to raise the temperature of the entire rolled material in the plate width direction so that the temperature reaches the forced cooling start set temperature, and based on the supplied power set value, set the second rolled plate width direction. Arithmetic control means for controlling the power supplied to the overall heating device. Characterized in that was.

[0010]

[Action]

 In the heating control device according to the present invention having the above-mentioned characteristics, the operation control means includes the central portion in the width direction of the rolled material sheet and the both end portions in the width direction of the rolled material sheet respectively measured by the scanning thermometer. Based on the temperature difference from the temperature, the power supplied to the heating device at both ends of the rolled material is supplied to heat both ends of the rolled material in the strip width direction so that the temperature is approximately equal to the temperature at the center of the strip width direction. Then, the power supplied to the heating device at both ends of the rolled material is controlled based on the obtained power supply setting value. The both ends of the rolled material in the plate width direction are controlled by the calculation control means whose electric power is controlled based on the electric power set value while the both ends of the rolled material in the plate width direction reach the whole heating device in the plate width direction. The temperature is raised so that the temperature becomes substantially equal to the center temperature in the plate width direction. Further, the arithmetic control means, based on the temperature difference between the predetermined finish rolling start set temperature and the central temperature of the rolled material strip width direction measured by the scanning thermometer, the entire rolled material strip width direction heating is performed. The electric power supplied to the equipment to raise the temperature of the entire strip in the strip width direction to the above set temperature is determined, and based on the set value of the supplied power, the power is supplied to the entire strip strip width heating device. Control power.

The whole rolling material width direction heating device is provided with a plurality of hourglass-shaped heating coil devices along the rolling line. According to this drum-shaped heating coil device, the entire widthwise direction of the rolled material running in the tube-shaped tubular shape with an hourglass-shaped cross section in which the part corresponding to the center of the rolled material in the widthwise direction is constricted is subjected to electromagnetic induction heating. Therefore, when the rectangular cross section is used, the corners at both ends in the width direction of the rolled material sheet will not be heated more than other parts due to the edge effect. It is possible to raise the temperature of the material uniformly over the entire plate width direction. Therefore, the rolled material is heated uniformly to the finish rolling start set temperature in the entire sheet width direction by the rolled material sheet width direction entire heating device whose electric power is controlled by the arithmetic control means based on the electric power set value. . As a result, the running rolling material has the finish rolling start set temperature in a state where the temperature is uniform in the strip width and the longitudinal direction on the entry side of the finishing rolling mill.

In the heating control device according to the invention of claim 2, between the finish rolling mill and the forced cooling device on the downstream side thereof, in order from the finish rolling mill side, a scanning thermometer and a heating device for both ends of the rolled material are provided. In addition, the whole rolling plate width direction heating device is provided, and the arithmetic control means is provided. The scanning thermometer, the both end heating device for the rolled material, the entire heating device for the width direction of the rolled material, and the arithmetic control means have essentially the same functions as those in the heating control device according to the first aspect of the present invention. Is configured. As a result, the rolling material that is running has the forced cooling start set temperature in a state where the temperature is uniform in the strip width and the longitudinal direction on the inlet side of the forced cooling device.

Further, according to the heating control device according to the third aspect of the invention, since the heating control device according to the first and second aspects of the invention is provided, the heating control device between the rough rolling mill and the finish rolling mill is provided. The rolling material that is running will have the finish rolling start set temperature in a state where the temperature is uniform in the strip width and longitudinal direction at the entry side of the finish rolling mill. The rolling material that is running during the period has a forced cooling start set temperature in a state where the temperature is uniform in the strip width and the longitudinal direction on the inlet side of the forced cooling device.

[0014]

【Example】

 Hereinafter, the present invention will be described based on examples. FIG. 1 is a diagram showing an overall configuration of a heating control device for rolled material in a hot rolling line according to an embodiment of the invention of claim 1, and FIG. 2 is a typical example of the both end heating device for rolled material shown in FIG. FIG. 3 is a diagram showing an outline of the configuration of both end heating coil devices, and FIG. 3 is a diagram showing an outline of the configuration of one drum-shaped heating coil device as a representative of the whole rolling material plate width direction heating device shown in FIG.

As shown in FIG. 1, in the hot rolling line, a rough rolling mill R 1, a finish rolling mill F, and a forced cooling device C are arranged in this order from the upstream side. Between the machine F, a rolled material both-ends heating device 1 and a rolled material plate width direction entire heating device 2 are arranged in this order from the upstream side. The rolled material both-ends heating device 1 is arranged between the table rollers along the rolling line, and is a plurality of later-described devices for electromagnetically heating both end portions in the plate width direction of the rolled material S running toward the finishing rolling mill F. both ends heating coil device 1 ₁ to 1 ₃ to, it is constituted by inverter unit for supplying power to these end portions heating coil device 1 ₁ to 1 ₃ (not shown). Further, the whole rolling material plate width direction heating device 2 is arranged between the table rollers along the rolling line, and a plurality of drums described later for electromagnetically heating the whole rolling material plate S width direction running inside thereof are provided. -type heating coil device 2 ₁ to 2 ₃ is constituted by the inverter unit for supplying power to these hourglass heating coil device 2 ₁ to 2 ₃ (not shown).

A scanning thermometer 3 for measuring the temperature of the rolled material S in the plate width direction is provided on the upstream side of the rolling material both-ends heating device 1, and the rolled material from the scanning thermometer 3 is provided. The signal indicating the temperature of S in the plate width direction is given to the arithmetic unit 4a which constitutes the arithmetic and control unit 4 as arithmetic and control means. The arithmetic and control unit 4 is composed of an arithmetic unit 4a and a control unit 4b.

The calculation unit 4a uses the scanning thermometer 3 to measure the temperature difference between the central temperature Tm in the width direction of the rolled material plate and the temperature Ts at both ends in the width direction of the rolled material plate. The electric power to be supplied to the part heating device 1 for raising both ends in the plate width direction of the rolled material S so that the temperature Ts thereof is substantially equal to the temperature Tm in the center part in the plate width direction is obtained, and the supplied power is shown. Both end supply power setting signals are given to the control unit 4b.

The calculation unit 4a further calculates the temperature based on the temperature difference between the predetermined finish rolling start set temperature Tf and the temperature Tm of the rolled material strip width direction central portion measured by the scanning thermometer 3. The power supplied to the entire heating device 2 in the width direction of the rolled material to raise the entire width of the rolled material S to the above set temperature Tf is obtained, and the plate width indicating the supplied power is calculated. The whole supply power setting signal is output to the control unit 4b.

The control unit 4b controls the energization of the inverter unit of the rolled material both-ends heating device 1 based on the both-ends supply power setting signal from the calculation unit 4a, so that the rolled-materials both-ends heating device 1 is controlled. supply power, that is with control the electric power supplied to both ends heating coil device 1 ₁ to 1 _3, the rolled material strip width direction across the heating device based on the plate width overall supply power setting signal from the operation unit 4a by performing energization control of the second inverter unit, the electric power supplied to the rolled material sheet width direction across the heating device 2, that is, controls the electric power supplied to the drum-type heating coil device 2 ₁ to 2 _3.

The rolled material both-ends heating device 1 is provided with _three both-ends heating coil devices 11 to ₁₃ in this embodiment. Among be describes the one end portions heating coil device 1 ₁ Nitsu as a representative. Both end portions heating coil device 1 _1, a plate width direction both end portions of the rolled material S be for raising the temperature by heating electromagnetic induction, as shown in FIG. 2, the plate width Direction of the rolled material S Two heating coils 1 ₁ a and 1 ₁ b, which are arranged so as to surround the upper surface, the side surface, and the lower surface at a predetermined interval with respect to the rolled material S at both ends, and to heat these is constituted by the coil ₁ 1 a, 1 1 b to the heating coil support mechanism (not shown) for supporting respectively. Each heating coil ₁ 1 a, 1 1 b is a winding alternating current is applied made of applies to the core.

[0021] The rolled material strip width direction across the heating device 2, in this embodiment has a three hourglass heating coil device 2 ₁ to 2 _3. Among explained about the one hourglass heating coil device 2 ₁ as a representative. Hourglass heating coil device 2 _1, a plate full width of the rolled material S travels inside be one for electromagnetic induction heating, as shown in FIG. 3, the plate width direction central portion of the rolled material S a drum-type heating coils 2 ₁ a which forms a cross-section hourglass cylindrical with constriction portions corresponding to, is constituted by a drum-type heating coil support Organization not shown supporting the drum type heating coil 2 ₁ a There is. Hourglass heating coil 2 ₁ a is a winding alternating current is applied made of applies to the core.

The operation of the rolled material heating control device having the above configuration will be described below. The calculation unit 4a of the calculation control device 4 calculates the rolled material based on the temperature difference between the central temperature Tm of the rolled material plate width direction and the temperature Ts of both ends of the rolled material plate width direction measured by the scanning thermometer 3. The electric power supplied to the both-end heating device 1 for raising both ends in the plate width direction of the rolled material S so that the temperature Ts becomes substantially equal to the temperature Tm in the center part in the plate width direction is obtained. The setting signal is output to the control unit 4b. Based on this signal, the control unit 4b, by performing the energization control of the inverter section of the rolled material both ends heating device 1, controls the power supply to the both ends heating coil device 1 ₁ to 1 _3. As a result, both end portions of the rolled material S in the plate width direction are heated so that the temperature thereof becomes substantially equal to the central portion temperature Tm of the rolled material plate width direction while reaching the entire heating device 2 in the plate width direction. To be done.

In addition, the calculation unit 4a, based on the temperature difference between the predetermined finish rolling start set temperature Tf and the temperature Tm of the central portion in the width direction of the rolled sheet material measured by the scanning thermometer 3, The electric power supplied to the entire width direction heating device 2 for raising the entire width of the rolled material S so that the temperature thereof reaches the set temperature Tf is obtained, and the whole width electric power setting signal is sent to the control unit 4b. Output to. Based on this signal, the control unit 4b controls the power supply to the hourglass-shaped heating coil devices 2 ₁ to 2 ₃ by controlling the energization of the inverter unit of the entire heating device 2 in the width direction of the rolled material sheet.

[0024] In this case, each hourglass heating coil device 2 ₁ to 2 _3, travels inside forms a cross-section hourglass cylindrical with constriction portions corresponding to the plate width direction central portion of the rolled material S rolled Since the entire width of the strip S is heated by electromagnetic induction, the corners at both ends of the strip in the strip width direction caused by the edge effect when the cross section has a rectangular shape are higher than those at other parts. Without being heated, the rolled material S can be uniformly heated in the entire plate width direction. Therefore, the rolling material S in running has the finish rolling start set temperature Tf in a state where the temperature is uniform in the strip width and the longitudinal direction on the entry side of the finish rolling mill F. By performing finish rolling in such a state, it is possible to obtain a rolled material having a uniform plate thickness without defects such as cracks at both ends in the plate width direction.

FIG. 4 is a diagram showing the overall configuration of a heating control device for rolled material in a hot rolling line according to an embodiment of the present invention. In FIG. 4, between the finish rolling mill F and the forced cooling device C, a rolled material both-ends heating device 5 and a rolled material plate width direction entire heating device 6 are arranged in this order from the upstream side. The rolled material both-ends heating device 5 is disposed between the table rollers along the rolling line, and electromagnetically guides and heats both end portions of the rolled material S running toward the forced cooling device C in the plate width direction. both ends heating coil device 5 ₁ to 5 _3, is constituted by an inverter for supplying electric power to these end portions heating coil equipment 5 ₁ to 5 ₃ (not shown).

Further, the whole rolling material plate width direction heating device 6 is arranged between the table rollers along the rolling line, and is provided with a plurality of drums for electromagnetically heating the entire rolling material S traveling in the plate width direction. -type heating coil device ₆₁ through ₃ is constituted by an inverter unit (not shown) for supplying power to these hourglass heating coil device ₆₁ through _3. It should be noted that each end heating coil device 5 _{1 to} 5 ₃ provided in the both end heating device 5 of the rolled material, and each drum-shaped heating coil device 6 ₁ provided in the entire heating device 6 in the width direction of the rolled plate 6 ₁ for a 6 ₃ configuration, because it is identical to that of the apparatus shown in FIG. 1, the description thereof is omitted.

A scanning thermometer 7 for measuring the temperature of the rolled material S in the plate width direction is provided on the upstream side of the rolling material both-ends heating device 5, and the rolled material from the scanning thermometer 7 is provided. The signal indicating the temperature of S in the plate width direction is given to the arithmetic unit 8a which constitutes the arithmetic and control unit 8 as arithmetic and control means. The arithmetic and control unit 8 is composed of an arithmetic unit 8a and a control unit 8b.

The calculation unit 8a calculates the temperature difference between the center temperature Tm in the width direction of the strip and the temperature Ts at both ends in the width direction of the strip measured by the scanning thermometer 7. The electric power to be supplied to the part heating device 5 for raising both ends in the plate width direction of the rolled material S so that the temperature Ts thereof is substantially equal to the temperature Tm in the center part in the plate width direction is obtained, and the supplied power is shown. Both end power supply setting signals are supplied to the control unit 8b.

The calculation unit 8a further calculates the above based on the temperature difference between the predetermined forced cooling start set temperature Tc and the temperature Tm of the rolled material strip width direction central portion measured by the scanning thermometer 7. The power supplied to the whole heating device 6 in the width direction of the rolled material to raise the temperature of the entire material in the width direction of the rolled material S to the above set temperature Tc is obtained, and the plate width indicating the supplied power is calculated. The whole supply power setting signal is output to the control unit 8b.

The control unit 8b controls the energization of the inverter unit of the rolled material both-ends heating device 5 based on the both-ends supply power setting signal from the calculation unit 8a, so that the both-ends heating coil device 5 ₁ and controls the power supplied to to _53, by performing the energization control of the inverter section of the rolled material strip width direction across the heating device 6 on the basis of the sheet width across the supply power setting signal from the operation unit 8a, hourglass a shall control the electric power supplied to the mold heating coil device ₆₁ through _3.

The operation of the rolled material heating control device having the above configuration will be described below. The calculation unit 8a of the calculation control device 8 calculates the rolled material based on the temperature difference between the central temperature Tm of the rolled material plate width direction and the temperature Ts of both ends of the rolled material plate width direction measured by the scanning thermometer 7. The power supply for heating both ends of the rolled material S in the strip width direction to the both end heating device 5 is calculated so that the temperature Ts becomes substantially equal to the center temperature Tm in the strip width direction. The setting signal is output to the control unit 8b. Based on this signal, the control unit 8b controls the power supply to the both end heating coil devices 5 _{1 to} 5 ₃ by controlling the energization of the inverter part of the rolled material both end heating device 5. As a result, both end portions of the rolled material S in the plate width direction are heated so that the temperature thereof becomes substantially equal to the temperature Tm of the rolled material plate width direction central portion while reaching the entire heating device 6 in the plate width direction. To be done.

Further, the calculation unit 8a, based on the temperature difference between the forced cooling start set temperature Tc and the temperature Tm of the central portion in the width direction of the rolled sheet material measured by the scanning thermometer 7, The electric power supplied to the heating device 6 for raising the entire width of the rolled material S in the plate width direction to the above set temperature Tc is obtained, and the entire plate width supply power setting signal is output to the control unit 8b. To do. Based on this signal, the control unit 8b controls the power supply to the hourglass-shaped heating coil devices 6 _{1 to} 6 ₃ by controlling the energization of the inverter unit of the entire rolling material plate width direction heating device 6.

[0033] In this case, each hourglass heating coil device ₆₁ through _3, travels inside forms a cross-section hourglass cylindrical with constriction portions corresponding to the plate width direction central portion of the rolled material S rolled Since the entire width of the strip S is heated by electromagnetic induction, the corners at both ends of the strip in the strip width direction caused by the edge effect when the cross section has a rectangular shape are higher than those at other parts. Without being heated, the rolled material S can be uniformly heated in the entire plate width direction. Therefore, the rolling material S that is running has the forced cooling start set temperature Tf in a state where the temperature is uniform in the strip width and the longitudinal direction on the entrance side of the forced cooling device C. By performing forced cooling in such a state, it is possible to obtain a rolled material whose mechanical properties are uniform over the entire plate.

FIG. 5 is a diagram showing the overall configuration of a heating control device for rolled material in a hot rolling line according to an embodiment of the invention of claim 3. In the heating control device according to this embodiment, the rolling material both end heating device and the rolling material plate width direction whole heating device are provided between the rough rolling mill R and the finishing rolling mill F, and between the finishing rolling mill F and the forced cooling device. They are arranged between C and C, respectively. Therefore, with regard to the configuration, only the correspondence relationship with FIGS. 1 and 4 will be described.

In FIG. 5, 11 has both-end heating coil devices 11 _{1 to} 11 ₃ and is a first rolled material both-end heating device corresponding to the rolled material both-end heating device 1 shown in FIG. It has a mold heating coil device 12 ₁ to 12 _3, a first rolled material strip width direction entire heating device corresponding to the rolled material strip width direction across the heating device 2 shown in FIG. Reference numeral 13 is a first scanning type thermometer corresponding to the scanning type thermometer 3 shown in FIG. 1, and 19A1 is a first arithmetic unit corresponding to the arithmetic unit 4a shown in FIG.

Further, 15 is a heating coil device 15 at both ends.₁~ 15₃And a second rolled material end heating device corresponding to the rolled material end heating device 5 shown in FIG. ₁ ~ 16₃And a second rolled material sheet width direction overall heating device corresponding to the rolled material sheet width direction entire heating device 6 shown in FIG. 2, and a second rolled sheet material width direction overall heating device 17 corresponding to the scanning thermometer 7 shown in FIG. A scanning thermometer, 19A2, is a second arithmetic unit corresponding to the arithmetic unit 8a shown in FIG.

Reference numeral 19 denotes an arithmetic and control unit as arithmetic and control means, and the arithmetic and control unit 19 comprises the first arithmetic unit 19A1, the second arithmetic unit 19A2, and a control unit 19B. The arithmetic and control unit 19 uses the first arithmetic unit 19A1 to determine the first rolled material temperature based on the rolled material temperature measured by the first scanning thermometer 13 arranged on the outlet side of the rough rolling mill R. Supply power for heating both end portions of the rolled material S in the strip width direction to the both end heating device 11 so that the temperature becomes substantially equal to the temperature in the center portion in the strip width direction, the finish rolling start set temperature Tf and the above Based on the temperature difference between the central temperature in the width direction of the rolled material plate measured by the first scanning thermometer 13, the plate of the rolled material S is given to the first heating device 12 for the entire width direction of the rolled material plate. The power supply for raising the temperature in the entire width direction to reach the set temperature Tf is obtained, and the control unit 19B heats both end portions based on the both-end supply power setting signal from the first calculation unit 19A1. performs control of electric power supplied to the coil device 11 ₁ to 11 _3, the first operation unit 19A1 Performs control of the power supplied to the drum-type heating coil device 12 ₁ to 12 _3, based on al the plate width overall supply power setting signal.

The calculation control device 19 further includes, based on the rolled material temperature measured by the second calculation unit 19A2 by the second scanning thermometer 17 arranged on the exit side of the finishing rolling mill F, Supply power for heating the both ends of the rolled material S in the plate width direction to the second heating device 15 for both ends of the rolled material so that the temperature of the both ends of the rolled material S becomes substantially equal to the temperature of the central part in the plate width direction. Based on the temperature difference between the cooling start set temperature Tc and the temperature of the central portion of the rolled sheet material in the sheet width direction measured by the second scanning thermometer 17, the second heating apparatus for the entire sheet material in the sheet width direction 16 And the supply power for raising the temperature of the entire rolled material S in the plate width direction so that the temperature reaches the set temperature Tc, and the control unit 19B supplies both end portions from the second calculation unit 19A2. control of the test feed force to both ends heating coil device 15 ₁ to 15 _3, based on the power setting signal Performs, Ru der performs also the control of the power supplied to the drum-type heating coil device 16 ₁ to 16 _3, based on the plate width overall supply power setting signal from the second arithmetic unit 19A2.

According to the heating control device having the above-described configuration, as understood from the description of the devices shown in FIGS. 1 and 4 described above, the running control between the rough rolling mill R and the finish rolling mill F is performed. The rolled material S has the finish rolling start set temperature Tf in a state in which the temperature is uniform in the strip width and the longitudinal direction on the entry side of the finish rolling mill F, and finish rolling is performed in such a state. It is possible to obtain a rolled material having a uniform plate thickness without defects such as cracks at both ends in the plate width direction. Further, the rolling material that is running between the finish rolling mill F and the forced cooling device C has the forced cooling start set temperature Tc at the entrance side of the forced cooling device C in a uniform state in the strip width and the longitudinal direction. In this state, forced cooling is performed, there are no defects such as cracks at both ends in the plate width direction, the plate thickness is uniform, and its mechanical properties are uniform over the entire plate. You can obtain wood.

[0040]

[Effect of device]

 A heating control device for a rolled material in a hot rolling line according to the present invention comprises a plurality of both-end heating coil devices for electromagnetically heating both end portions in the plate width direction of a running rolled material along the rolling line. A part heating device and a plurality of hourglass-shaped heating coil devices, which are arranged downstream of the both ends of the rolled material and electromagnetically heat the entire width direction of the rolled material during running, are provided along the rolling line. It is equipped with a rolling material plate width direction overall heating device, and while the rolled material reaches the rolling material plate width direction overall heating device, the temperature of the rolled material at both ends in the plate width direction becomes With the drum-shaped heating coil device that has a drum-shaped heating coil device that has a drum-shaped cross section in which the temperature rises to be approximately equal to the temperature in the center of the width direction and the part corresponding to the center of the width direction of the rolled material is narrowed Compare the corners at both ends to other parts Without further heated, and is configured to be heated to a predetermined set temperature rolled material evenly one across the plate width direction. Therefore, according to the heating control device for rolled material in the hot rolling line according to the invention of claim 1, a heating coil device at both ends and an entire heating device in the strip width direction are provided between the rough rolling mill and the finish rolling mill. Since the rolling material is arranged, the rolling material during running has a finish rolling start set temperature in a state in which the temperature is uniform in the strip width and the longitudinal direction at the entrance side of the finish rolling mill. By performing the finish rolling in this state, it is possible to obtain a rolled material with a uniform plate thickness without defects such as cracks at both ends in the plate width direction. According to the heating control device for rolled material in the hot rolling line according to the invention of claim 2, the heating coil device at both ends and the entire heating device in the width direction of the rolled material are provided between the rough rolling mill and the finish rolling mill. Therefore, the rolling material during running has the forced cooling start set temperature in a state where the temperature is uniform in the strip width and the longitudinal direction at the inlet side of the forced cooling device. By performing the forced cooling by the forced cooling device in this state, it is possible to obtain a rolled material whose mechanical properties are uniform over the entire plate. According to the heating control device for the rolled material in the hot rolling line according to the invention of claim 3, rolling is performed between the rough rolling mill and the finish rolling mill and between the finish rolling mill and the forced cooling device, respectively. Since both ends of the material heating device and the entire heating device in the width direction of the rolled material are installed, the rolled material that has undergone finish rolling and forced cooling has defects such as cracks at both ends in the width direction. It has a uniform thickness and a uniform mechanical property over the entire plate.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a heating control device for rolled material in a hot rolling line according to an embodiment of the present invention.

FIG. 2 is a diagram schematically showing the configuration of one end heating coil device as a representative of the rolled material end heating device shown in FIG.

FIG. 3 is a diagram showing an outline of the configuration of one drum-shaped heating coil device as a representative of the entire rolling plate width direction heating device shown in FIG. 1.

FIG. 4 is a diagram showing an overall configuration of a heating control device for rolled material in a hot rolling line according to an embodiment of the invention of claim 2;

FIG. 5 is a diagram showing an overall configuration of a heating control device for rolled material in a hot rolling line according to an embodiment of the invention of claim 3;

[Explanation of symbols]

1, 5 ... Heating device for both ends of rolled material ₁₁ to 1 ₃ , 5 _{1 to} 5 ₃ ... Heating coil device for both ends ₁₁ a, ₁₁ b ... Heating coil 2, 6 ...
Whole rolled material strip width direction heating device 2 ₁ to 2 _{3, 61} through ₃ ... hourglass heating coil device 2 ₁ a ... hourglass heating coil 3, 7 ... scanning thermometer 4,8 ... arithmetic and control unit 4a, 8a ... Arithmetic unit 4b,
8b ... Control part 11 ... 1st rolling material both-ends heating apparatus 11 ₁ ...
11 ₃ ... both ends heating coil device 12 ... first rolling material plate width direction entire heating device 12 _{1 to} 12 ₃ ... drum-shaped heating coil device 13
… 1st scanning type thermometer 15… 2nd rolling material both ends heating device 15 ₁ to 15 ₃ …. Both ends heating coil device 16… 2nd rolling material plate width direction whole heating device 16 _{1 to} 16 ₃ … drum Type heating coil device 17 ... Second scanning type thermometer 19 ... Operation control device
19A1 ... 1st calculation part 19A2 ... 2nd calculation part 19B ... Control part
R ... Rough rolling mill F ... Finishing rolling mill C ... Forced cooling device S
… Rolled material

Claims (3)

[Scope of utility model registration request] 1. A both-end heating coil device arranged between a rough rolling mill and a finish rolling mill to electromagnetically heat both ends of a rolled material running toward the finish rolling mill in the plate width direction. A plurality of rolled material both-end heating devices provided along the line, and a downstream side of the rolled material both-end heating devices, which is arranged on the inlet side of the finishing rolling mill, and corresponds to the central portion in the plate width direction of the rolled material. An entire rolling material plate width direction equipped with a plurality of hourglass-shaped heating coil devices along the rolling line that electromagnetically heats the entire rolling material plate width direction running inside the tubular shape with a constricted section A heating device, a scanning thermometer that measures the temperature of the rolled material in the plate width direction on the upstream side of the rolled material both ends heating device, and a rolled material plate width direction central portion measured by the scanning thermometer Based on the temperature difference between the temperature and the temperature at both ends of the rolled material plate in the width direction, Given to the rolling material both-ends heating device, determine the power supply for heating the plate width direction both ends of the rolled material so that the temperature is substantially equal to the plate width direction central portion temperature,
Control the power supply to the both ends heating device of the rolled material based on the supply power set value, the predetermined finishing rolling start set temperature and the rolling plate width direction central portion temperature measured by the scanning thermometer and Based on the temperature difference of, the supply power for heating the rolled material plate width direction overall heating device, to raise the temperature of the entire rolled material plate width direction so that the temperature becomes the set temperature, the supplied power A heating control device for a rolled material in a hot rolling line, comprising: arithmetic control means for controlling electric power supplied to the entire heating device for the rolled material sheet width direction based on a set value. 2. Both-end heating for electromagnetically heating both ends of a rolled material running toward the forced cooling device between the finish rolling mill and the forced cooling device downstream of the finishing rolling device. A rolled material both-ends heating device provided with a plurality of coil devices along the rolling line, and a downstream side of the rolled material both-ends heating device and an inlet side of the forced cooling device, and the center of the rolled material in the plate width direction. Rolled material provided with a plurality of hourglass-shaped heating coil devices along the rolling line for electromagnetically heating the entire width direction of the rolled material running in the tube-shaped cylindrical shape having a constricted part corresponding to the part An entire heating device in the strip width direction, a scanning thermometer for measuring the temperature in the strip width direction of the rolled material on the upstream side of the heating device for both ends of the rolled material, and a rolled material plate respectively measured by the scanning thermometer. The temperature in the center of the width direction and the temperature at both ends in the width direction of the rolled material plate Based on the temperature difference of, the power supply for heating both ends of the rolled material in the strip width direction to increase the temperature so that the temperature is approximately equal to the temperature in the center of the strip width ,
Control the power supply to the both ends heating device of the rolled material based on the supply power set value, the predetermined forced cooling start set temperature and the rolling plate width direction central portion temperature measured by the scanning thermometer and Based on the temperature difference of, the supply power for heating the rolled material plate width direction overall heating device, to raise the temperature of the entire rolled material plate width direction so that the temperature becomes the set temperature, the supplied power A heating control device for a rolled material in a hot rolling line, comprising: arithmetic control means for controlling electric power supplied to the entire heating device for the rolled material sheet width direction based on a set value. 3. A both-end heating coil device arranged between a rough rolling mill and a finish rolling mill to electromagnetically heat both ends of a rolled material running toward the finish rolling mill in the plate width direction. A plurality of first rolled material both-end heating devices provided along the line, and a strip width of the rolled material which is arranged downstream of the first rolled material both-end heating device and on the inlet side of the finish rolling mill. A plurality of hourglass-shaped heating coil devices for electromagnetically heating the entire strip width direction of the rolled material running in the tube-shaped tubular shape having a constricted portion corresponding to the central portion in the direction are provided along the rolling line. A first rolling material plate width direction overall heating device, a first scanning thermometer for measuring the temperature of the rolling material in the plate width direction on the upstream side of the first rolling material both end heating device, and finish rolling It is installed between the machine and the forced cooling device on the downstream side, and runs toward the forced cooling device. A second rolling material both-ends heating device provided with a plurality of both-ends heating coil devices for electromagnetically heating both ends of the rolled material in the plate width direction, The strip width of the strip that is disposed downstream of the forced cooling device and has a drum-shaped cross section that has a constricted portion corresponding to the center of the strip in the strip width direction and that runs inside the strip. A second rolling material plate width direction overall heating device having a plurality of hourglass-shaped heating coil devices for electromagnetic induction heating along the rolling line, and rolling on the upstream side of the second rolling material both-ends heating device A second scanning thermometer for measuring the temperature of the strip in the plate width direction, and a central temperature of the rolled strip plate width direction and a temperature at both ends of the rolled strip plate width direction measured by the first scanning thermometer. Based on the temperature difference of, the first rolling material both ends heating device, The power supply for heating both ends of the rolled material in the plate width direction so that its temperature becomes substantially equal to the temperature in the center of the plate width direction is obtained, and the both ends of the first rolled material are heated based on the supplied power set value. By controlling the electric power supplied to the apparatus, based on the temperature difference between the predetermined finish rolling start set temperature and the temperature in the central portion of the strip width direction measured by the first scanning thermometer, the first Given to the whole rolling material plate width direction heating device, obtain the power supply for heating the entire plate width direction of the rolled material so that the temperature becomes the finish rolling start set temperature, based on the supplied power set value While controlling the power supplied to the first heating device for the entire width direction of the rolled material plate, the central temperature of the rolled material plate width direction and both ends of the rolled material plate width direction measured by the second scanning thermometer, respectively. Based on the temperature difference from the temperature, the second Determine the power supply to give to both ends of the rolled material to the plate width direction both ends of the rolled material so that the temperature becomes approximately equal to the center temperature in the plate width direction, and based on the supplied power set value Controlling the power supplied to the second rolling material both-ends heating device, the predetermined forced cooling start set temperature and the rolled material strip width direction central portion temperature measured by the second scanning thermometer Based on the temperature difference, the power supplied to the second rolling material plate width direction overall heating device to raise the temperature of the entire rolling material plate width direction to the forced cooling start set temperature is supplied. And a calculation control means for controlling the electric power supplied to the second entire heating device for the width direction of the rolled material sheet based on the set value of the supplied electric power, and the heating of the rolled material in the hot rolling line. Control device.