KR101739862B1 - Method and apparatus for controlling tension of strip in furnace for manufacturing non-oriented electrical steel sheets - Google Patents

Method and apparatus for controlling tension of strip in furnace for manufacturing non-oriented electrical steel sheets Download PDF

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Publication number
KR101739862B1
KR101739862B1 KR1020150185060A KR20150185060A KR101739862B1 KR 101739862 B1 KR101739862 B1 KR 101739862B1 KR 1020150185060 A KR1020150185060 A KR 1020150185060A KR 20150185060 A KR20150185060 A KR 20150185060A KR 101739862 B1 KR101739862 B1 KR 101739862B1
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South Korea
Prior art keywords
annealing furnace
strip
roll
tension control
speed
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KR1020150185060A
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Korean (ko)
Inventor
조재향
김재수
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주식회사 포스코
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/125—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest with application of tension
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1255—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest with diffusion of elements, e.g. decarburising, nitriding
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1272—Final recrystallisation annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/562—Details
    • C21D9/563—Rolls; Drums; Roll arrangements
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/562—Details
    • C21D9/564—Tension control

Abstract

A method for controlling the strip tension of an annealing furnace for producing a non-oriented electrical steel sheet so as to improve the iron loss quality in the course of producing a non-oriented electrical steel sheet and to reduce iron loss by reducing the tensile force applied to the strip in the furnace, A calculating step of calculating a speed difference between a driving speed of an outward tension control roll disposed on the exit side of the annealing furnace and a driving speed of the input side tension control roll disposed on the entrance side of the annealing furnace during strip transportation, And controlling the driving speed of the hustle roll disposed inside the annealing furnace such that the speed difference obtained in the annealing furnace is within a predetermined range.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and apparatus for controlling a strip tension in an annealing furnace for producing a non-oriented electrical steel sheet,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing a non-oriented electrical steel sheet, and more particularly, to a method and apparatus for controlling a strip tension of an annealing furnace in order to improve iron loss quality in a non-oriented electrical steel sheet manufacturing process.

In general, the nonoriented electrical steel sheet has uniform magnetic properties in all directions by uniformly orienting the direction of easy magnetization of the crystal in all directions, so that it has uniform magnetic characteristics in the rolling direction and other directions, Precision motors are widely used for iron core materials of rotating machines.

The non-oriented electrical steel sheet is manufactured by heat treatment (annealing) the rolled steel sheet in the annealing furnace and coating process. In the interior of the annealing furnace, a plurality of hustle rolls (for example, 150 to 170) are provided with an interval. The feed rate of the strip is controlled by a tension bride roll installed at the inlet and outlet of the annealing furnace.

Oriented electrical steel sheets, HNO (high non-oriented electrical steel sheets), and MNO (middle non-oriented electrical steel sheets) according to the quality of iron loss. , And low non-oriented electrical steel sheets (LNO). The nonoriented electrical steel sheet is thinner in thickness and has a slower operating speed in the case of advanced materials. For example, Hyper NO is 140-160 mpm, and other HNO is 180 mpm or more, for example.

Factors influencing the iron loss quality of the non-oriented electrical steel sheet include annealing temperature, furnace tension, and material composition. The double annealing temperature and material composition are standardized with optimized values and precise control is possible to hit the target value during operation.

In the case of the in-furnace tension, it is known that the lower the tension is, the better the iron loss tends to be, and it is necessary to perform the operation in the minimum tension state.

A strip tension control method and apparatus in an annealing furnace for manufacturing a non-oriented electrical steel sheet that can improve iron loss quality in a non-oriented electrical steel sheet manufacturing process are provided.

Also provided is a strip tension control method and apparatus for an annealing furnace for producing a non-oriented electrical steel sheet that can effectively improve iron loss by reducing the tensile force applied to a strip in a heating zone and a crack band inside an annealing furnace which substantially affects iron loss do.

A method and an apparatus for controlling a strip tension in an annealing furnace for manufacturing a non-oriented electrical steel sheet that facilitates process control for quality improvement are provided.

To this end, the control method of this embodiment is a method for controlling the strip tension of an annealing furnace for producing a non-oriented electrical steel sheet, comprising the steps of: conveying a strip along an annealing furnace; An operation step of obtaining a speed difference between a driving speed and a driving speed of an input side tension control roll disposed at an entrance side of an annealing furnace; and a control step of controlling the driving speed of the hustle roll disposed inside the annealing furnace such that a speed difference, And a control step of adjusting the temperature of the liquid.

The hustling roll speed control step may be a structure for controlling the hustling roll disposed in the cooling zone of the annealing furnace.

In the control step, the driving speed of the hustle roll disposed in the cooling zone of the annealing furnace can be set to be smaller than the traveling speed of the strip.

The control step may control the driving speed of the husel roll such that the difference in speed between the driving speed of the annealing furnace outward tension control roll and the driving speed of the in-side tension control roll is within the range of 0mpm to 0.3mpm.

In the control step, the husk roll disposed in the cooling zone of the annealing furnace may have a relatively high frictional force with the strip as compared with other husk rolls disposed in the annealing furnace.

In the control step, the husk roll disposed in the annealing furnace cooling bed may be made of a ceramic material.

The control apparatus of this embodiment is an apparatus for controlling the strip tension of an annealing furnace for producing a non-oriented electrical steel sheet, which comprises an annealing furnace for heat-treating the strip, a hustling roll installed inside the annealing furnace for supporting the strip, An input side tension control roll and an output side tension control roll which are respectively provided to the input tension control roll and the input side tension control roll for feeding and conveying the strip, And controlling the driving speed of the hustle roll disposed inside the annealing furnace such that the speed difference is within a predetermined range.

The annealing furnace includes a preheating zone for preheating the strip along the strip moving direction, a heating zone for heating the strip, a cooling zone for cooling the strip, and a cooling zone for cooling the strip are sequentially arranged, It may be a structure for controlling the speed.

The control unit may be configured to control the driving speed of the hustle roll disposed in the cooling zone to be smaller than the strip moving speed.

The control unit may be configured to adjust the driving speed of the hustle roll so that the difference in speed between the driving speed of the annealing furnace outward tension control roll and the driving speed of the in-side tension control roll is 0mpm or more and 0.3mpm or less.

The husk roll provided in the annealing furnace cooling bed may have a relatively high frictional force with the strip as compared with other husk rolls disposed in the annealing furnace.

The husk roll disposed in the annealing furnace cooling bed may be made of a ceramic material.

According to the present embodiment as described above, it is possible to minimize the tensile force applied to the strip substantially during the heating section of the annealing furnace during the manufacturing process of the non-oriented electrical steel sheet, thereby improving the iron loss quality.

Further, it is possible to control the tension of the strip only by calculating the speed difference of the tension control rolls on the front and rear sides of the annealing furnace, thereby simplifying the process control and facilitating the control, thereby improving the quality of the product do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing an annealing apparatus for producing a non-oriented electrical steel sheet having a strip tension control apparatus according to an embodiment of the present invention; FIG.
2 is a graph showing the iron loss quality deviation according to the range of the tension control roll speed difference in the present embodiment.
Fig. 3 shows the strip tension in the annealing furnace according to this embodiment compared with the conventional one.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Fig. 1 schematically shows the structure of an annealing facility according to this embodiment.

Referring to FIG. 1, the annealing facility 100 according to the present embodiment is for producing a non-oriented electrical steel sheet. The annealing furnace 100 includes an annealing furnace 110 for annealing the strip, a furnace 110 installed inside the annealing furnace 110, Hose rolls 111 and 112 and an input tension control roll 120 and an output tension control roll 123 installed at the entrance and exit of the annealing furnace 110 to control the moving speed of the strip.

The annealing furnace 110 is for heat treating the screed. The annealing furnace 110 is provided with a preheating stage 113 for preheating the strip along the strip moving direction, a heating stand 114 and a crack stand 115 for heating the strip, (116) are sequentially arranged.

The strip is then moved to the inside of the annealing furnace 110 and heated while passing through the preheating stage 113, the heating stage 114 and the cracking stage 115 in turn, (116) and is heat treated.

In the annealing furnace 110, a plurality of hustle rolls 111 and 112 for moving strips are arranged at intervals. The hustle rolls 111 and 112 are rotated at a constant speed by the driving force of the driving motors 117 and 118 connected to the rotating shaft, and the strips placed thereon are transported.

An entrance tension control roll 120 is disposed at the entrance side of the annealing furnace 110 and the strip is moved to the annealing furnace 110 via the entrance tension control roll 120. The incoming tension control roll 120 is connected to the driving unit 122 and rotates at a predetermined speed to advance the strip into the annealing furnace 110. An exit tension control roll 123 is disposed on the exit side of the annealing furnace 110 so that the strip is taken out of the annealing furnace 110 and moved through the exit tension control roll 123. The outgoing tension control roll 123 is connected to the driving unit 132, and rotates at a predetermined speed to pull the strip from the annealing furnace 110.

In the annealing facility 100 having the above-described structure, the apparatus has a structure that moves the strip while minimizing the tension applied to the strip in the annealing furnace 110.

For this purpose, the strip tension control device of the present embodiment calculates the difference between the driving speed of the outgoing tension control roll 123 and the speed of the driving of the input tension control roll 120 disposed at the entrance of the annealing furnace 110, And a controller 140 that adjusts the driving speed of the hustle roll disposed inside the annealing furnace such that the speed difference is within a predetermined range. In the following description, the driving speed means the rotation speed of the roll.

The control unit 140 controls the driving of the input tension control roll 120 and the driving control of the input tension control roll 120 in the range of 0mpm to 0.3mpm (Hereinafter, referred to as a cooling zone versus hustle roll 112 for convenience of explanation) provided in the cooling zone 116 of the annealing furnace so as to control the speed of the cooling zone .

By controlling the driving speed of the cooling band versus the husk roll 112 of the annealing furnace within the above-described speed difference range, it is possible to minimize the tension of the strip passing through the heating band before the cooling band and the crack band in the annealing furnace.

In the present embodiment, the control unit 140 controls the driving speed of the hustle roll 112 disposed on the cooling rack 116 of the annealing furnace to be slower than the strip moving speed. That is, the present apparatus controls the driving speed of the cooling band hust roll 112 to be slower than the moving speed of the strip, and adjusts the speed difference of the driving speed of the outgoing tension control roll 123 with respect to the driving speed of the input side tension control roll 120 Thereby controlling the driving speed of the cooling band hairs roll 112 in the range of the cooling rate.

When the driving speed of the cooling band hairs roll 112 is reduced in a state in which the cooling band hairs roll 112 is in close contact with the strip and the strip is moved, the movement of the strip passing through the cooling band 116 due to friction with the strip The speed is reduced. Therefore, the moving speed of the strip can be controlled by controlling the driving speed of the cooling band hairs roll 112, and the driving speed difference between the input tension control roll 120 and the output tension control roll 123 is controlled by the speed difference range As shown in FIG.

The cooling band hairs roll 112 may have a relatively high frictional force with the strip as compared with the other hose rolls 111 disposed in the annealing furnace 110. In this embodiment, the cooling vice roll 112 may be made of a ceramic material. The other Hus Roll 111 except for the cooling zone Hus Roll 112 is made of carbon material like the conventional structure. The ceramics rolls have a coefficient of friction more than two times higher than that of carbon rolls. Thus, the present apparatus can increase the frictional force between the cooling band and the hustle roll 112 and the strip more easily than before, and it is easier to control the advancing speed of the strip through the change of the driving speed of the cooling band hustle roll 112.

Thus, the driving speed of the cooling band hairs roll 112 is lowered than the strip moving speed through the control unit 140, and the driving speed of the output tension control roll 123 is relatively higher than the input tension control roll in the speed difference range , It is possible to normally move the strip in the annealing furnace 110 while minimizing the tension applied to the strip in the strip heating section in the annealing furnace.

In this embodiment, the control unit 140 is connected to a driving motor 118 that rotates the cooling band hustle roll 112 to control the driving motor. The driving motor 118 is operated in response to the signal of the control unit 140 to rotate the cooling band hustle roll 112 at a predetermined speed.

The control unit 140 is connected to each of the driving units 122 and 132 provided in the input tension control roll 120 and the output tension control roll 123 and controls the driving speed of the input tension control roll 120 and the output tension control And the driving speed of the roll 123, respectively.

The control unit 140 detects the driving speeds of the input tension control roll 120 and the output tension control roll 123 applied from the driving units 122 and 132 and controls the input tension control rolls 120 and the output tension control roll 123 are within the set speed difference range, the drive motor 118 is controlled to be driven.

In this embodiment, the speed difference range by the control unit 140 can be set to 0mpm or more and 0.3mpm or less. When the speed difference range is lower than 0mpm, there is a problem that the strip meander in the annealing furnace. The reason that the velocity difference range is lower than 0mpm means that the length of the strip introduced into the annealing furnace is longer than the length of the strip coming out of the annealing furnace. If the speed difference range exceeds 0.3 mpm, there is a problem that the iron loss quality becomes poor. The large difference in speed means that the tension of the strip inside the annealing furnace increases and the strip is stretched.

2 is a graph showing a correlation between a speed difference and an iron loss quality.

As shown in Fig. 2, when the difference between the driving speed of the annealing furnace outward tension control roll and the driving speed of the incoming tension control roll is 0.3 mpm or more, the iron loss quality tends to deteriorate. Thus, in the present embodiment, it is possible to prevent the deterioration of the iron loss quality by controlling the speed difference range to be 0.3 mpm or less.

The annealing furnace has a length of more than about 200 m, and conventionally, remote tension control is performed through a tension control roll disposed outside the annealing furnace. Further, it is determined that the tensile force received by the strip in the annealing furnace is due to the tensile force by the output tension control roll disposed on the exit side of the annealing furnace, and the driving speed of the output tension control roll is adjusted downward. , The driving speed of the hose roll at the inlet side was increased. However, in such a structure, it is difficult to proceed normally because the strip is staggered inside the annealing furnace, and it is difficult to lower the tension in the heating zone which substantially affects the iron loss of the strip due to the tension applied to the strip over a long distance. .

On the other hand, as described in the case of the present embodiment, tension control can be performed at a close range through the control of the cooling band hustle roll 112. This minimizes the tension on the strips passing through the heating zone, thereby improving the iron loss more effectively.

Fig. 3 shows the strip tension in the annealing furnace according to this embodiment compared with the conventional one.

3, the comparative example has a structure in which the tension of the strip passing through the inside of the annealing furnace is controlled by using the input tension control roll and the output tension control roll as in the prior art. Controlled by the speed difference range of the placed cooling hairs roll.

As shown in FIG. 3, in the comparative example, the high tension is maintained in the entire section of the annealing furnace so that a high tensile force is applied to the strip in the heating section. In contrast to the comparative example in this embodiment, It can be seen that the tensile force applied to the endless belt can be relatively lowered.

Hereinafter, a process of controlling the strip tension of the annealing furnace 110 for producing the non-oriented electrical steel sheet according to the present embodiment will be described.

The strip passes through the annealing furnace 110 while moving across the entrance tension control roll 120 and the exit tension control roll 123 of the annealing furnace 110. The strip moves to the annealing furnace 110 via the grain tension control roll 120 of the annealing furnace 110 and the annealing furnace 110 is heated by the pretensioner 113 of the annealing furnace 110 and the heating stand 114, And is moved through the output tension control roll 123 of the annealing furnace 110 after being heat-treated.

The input tension control roll 120 and the output tension control roll 123 are rotationally driven in accordance with the output value of the set driving unit to move the strip.

In this strip annealing process, the control section obtains the speed difference between the driving speed of the outward tension control roll disposed on the exit side of the annealing furnace and the driving speed of the input side tension control roll disposed on the inlet side of the annealing furnace during strip feeding, The driving speed of the hustle roll disposed inside the annealing furnace is adjusted so that the difference is within the predetermined range.

The control unit 140 is connected to each of the driving units 122 and 132 provided in the input tension control roll 120 and the output tension control roll 123 and outputs driving speeds of the input tension control roll 120 and the output tension control rolls 123, respectively.

The control unit 140 detects the driving speeds of the input tension control roll 120 and the output tension control roll 123 applied from the driving units 122 and 132 and controls the input tension control rolls 120 and the output tension control roll 123 are within the set speed difference range, the drive motor 118 is controlled to be driven.

The driving speed of the cooling band hairs roll 112 disposed on the cooling band 116 of the annealing furnace 110 in accordance with the driving of the control unit 140 is controlled by the driving speed of the output tension control roll 123 disposed on the output side of the annealing furnace 110 The speed difference between the driving speed and the driving speed of the input tension control roll 120 disposed at the entrance of the annealing furnace 110 is controlled to fall within the set range.

For example, when the driving speed difference between the output tension control roll 123 and the input tension control roll is larger than the set speed difference range, the stripping speed of the strip passing through the annealing furnace 110 becomes too high, Is poor.

Accordingly, the control unit 140 further reduces the driving speed of the cooling tension bar roll 112, thereby lowering the driving speed of the output tension control roll to fall within the speed difference range.

When the driving speed of the cooling band hust roll 112 becomes lower, the moving speed of the strip passing through the cooling band 116 is reduced by the frictional force between the cooling band hust roll 112 and the strip. As a result, the tension applied to the strip is lowered, so that the iron loss deficiency can be solved and the iron loss can be favorably formed.

When the moving speed of the strip is reduced by controlling the driving speed of the cooling band hairs roll 112, the driving speed of the output tension control roll 123 for moving the strip is also reduced. When the driving speed of the outgoing tension control roll 123 is lowered to the set speed difference range, the operation is proceeded with the tension applied to the strip being minimized.

The control unit 140 continuously controls the driving speed of the cooling band hairs roll 112 while maintaining the driving speed difference between the input tension control rolls and the output tension control rolls 123 within the speed difference range. Thus, the annealing process can be performed while minimizing the tension applied to the strip in the heating zone of the annealing furnace, while moving the strip with the tensile force normally in the range of the speed difference.

While the illustrative embodiments of the present invention have been shown and described, various modifications and alternative embodiments may be made by those skilled in the art. Such variations and other embodiments will be considered and included in the appended claims, all without departing from the true spirit and scope of the invention.

100: Annealing facility 110: Annealing furnace
111: Hus Roll 112: Cooling Stand Hus Roll
116: Cooling stand 117, 118: Driving motor
120: Inside tension control roll 122, 132:
130: Exertion tension control roll 140:

Claims (12)

As a strip tension control method for an annealing furnace for producing a non-oriented electrical steel sheet,
A calculating step of obtaining a speed difference between a driving speed of the outgoing tension control roll disposed on the exit side of the annealing furnace and a driving speed of the incoming side tension control roll disposed on the inlet side of the annealing furnace, And a control step of adjusting a driving speed of the hus-roll disposed inside the annealing furnace such that the speed difference obtained in the calculating step is within a predetermined range,
The hustling roll speed control step controls the hustling roll disposed in the cooling zone of the annealing furnace and performs the annealing for forming the non-oriented electrical steel sheet for setting the driving speed of the hustling roll disposed in the cooling zone of the annealing furnace to be smaller than the advancing speed of the strip A method of controlling a strip tension in a conveyor belt. delete delete The method according to claim 1,
Wherein the control step controls the driving speed of the hustle roll so that the difference in speed between the driving speed of the annealing furnace outward tension control roll and the driving speed of the incoming tension control roll is within the range of 0mpm to 0.3mpm Tension control method. 5. The method of claim 4,
Wherein the husk roll disposed in the cooling zone of the annealing furnace in the control step has a relatively high frictional force with the strip as compared with other husk rolls disposed in the annealing furnace. 6. The method of claim 5,
In the controlling step, the husk roll disposed in the annealing furnace cooling bed is made of a ceramic material, and the strip tension controlling method of the annealing furnace for producing a non-oriented electric steel sheet. As a strip tension control device for an annealing furnace for producing a non-oriented electrical steel sheet,
A hill roll provided inside the annealing furnace for supporting the strip, an input tension control roll and an output tension control roll provided respectively at the entrance and exit of the annealing furnace to apply a tension to the strip, And a speed difference between a driving speed of the outgoing tension control roll and a driving speed of the input side tension control roll disposed at the entrance side of the annealing furnace and controlling the driving speed of the hustle roll disposed inside the annealing furnace such that the speed difference is within the predetermined range And a control unit for controlling the control unit,
The annealing furnace is provided with a preheating zone for preheating the strip along the strip moving direction, a heating zone for heating the strip and a cooling zone for cooling the strip,
Wherein the control unit controls the driving speed of the hustle roll disposed in the cooling zone and controls the driving speed of the hustle roll disposed in the cooling zone to be smaller than the strip moving speed, . delete delete 8. The method of claim 7,
Wherein the control unit adjusts the driving speed of the hustle roll so that the difference in speed between the driving speed of the annealing furnace outward tension control roll and the driving speed of the in-side tension control roll is 0mpm to 0.3mpm Strip tension control device. 11. The method of claim 10,
Wherein the husk roll provided in the annealing furnace cooling bed has a relatively high frictional force with the strip as compared with other husk rolls disposed in the annealing furnace. 12. The method of claim 11,
Wherein the husk roll disposed in the annealing furnace cooling bed is made of a ceramic material, and a strip tension control device in an annealing furnace for producing a non-oriented electric steel sheet.
KR1020150185060A 2015-12-23 2015-12-23 Method and apparatus for controlling tension of strip in furnace for manufacturing non-oriented electrical steel sheets KR101739862B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190136571A (en) * 2018-05-31 2019-12-10 주식회사 포스코 Prediction apparatus for iron loss reduction of electric steel sheet
CN113549856A (en) * 2021-06-28 2021-10-26 鞍钢股份有限公司 Method for controlling deviation in aluminum-zinc-plated semi-hard steel furnace and temperature in zinc furnace
CN114990326A (en) * 2022-06-20 2022-09-02 宝钢湛江钢铁有限公司 Method for automatically controlling buckling of hot section of vertical annealing furnace

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Publication number Priority date Publication date Assignee Title
JP2011127196A (en) * 2009-12-18 2011-06-30 Jfe Steel Corp Heat-treatment method for metal band

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011127196A (en) * 2009-12-18 2011-06-30 Jfe Steel Corp Heat-treatment method for metal band

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190136571A (en) * 2018-05-31 2019-12-10 주식회사 포스코 Prediction apparatus for iron loss reduction of electric steel sheet
KR102075245B1 (en) * 2018-05-31 2020-02-07 주식회사 포스코 Prediction apparatus for iron loss reduction of electric steel sheet
CN113549856A (en) * 2021-06-28 2021-10-26 鞍钢股份有限公司 Method for controlling deviation in aluminum-zinc-plated semi-hard steel furnace and temperature in zinc furnace
CN113549856B (en) * 2021-06-28 2022-08-16 鞍钢股份有限公司 Method for controlling deviation in aluminum-zinc-plated semi-hard steel furnace and temperature in zinc furnace
CN114990326A (en) * 2022-06-20 2022-09-02 宝钢湛江钢铁有限公司 Method for automatically controlling buckling of hot section of vertical annealing furnace
CN114990326B (en) * 2022-06-20 2024-02-23 宝钢湛江钢铁有限公司 Automatic control method for buckling of hot section of vertical annealing furnace

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