KR100518335B1 - An apparatus for controlling roll force and line speed in strip welding zone - Google Patents

Abstract

An object of the present invention is to provide a rolling mill rolling force and a line speed control device for controlling the rolling force control section to the minimum at the point where the weld passes through the rolling mill, and at the same time applying the minimum rolling force during the control section. .

The present invention, the weld tracking portion 105 for detecting a weld of the raw material; A length calculator (106) for calculating a distance between the welded part and the temper mill (100); A rolling force variable setting unit 102 for selectively providing a normal rolling force value or a rolling force value for the welded portion; Upon detection of the weld, the rolling force is controlled by the rolling force value set by the variable rolling force setting unit 102 for a preset time, and also stepwise for a predetermined period before and after the weld passes through the temper mill 100. PLC 103 for controlling at different line speeds; A rolling force adjusting unit 104 for adjusting the rolling force by dividing it into a rolling force and a normal rolling force at the time of passing the weld; And when the welding part is detected, the line speed is firstly reduced, and the welding part is decelerated secondly at a point before a predetermined distance before the welding part passes through the temper mill 100, and then the welding part passes through the temper mill 100 in advance. It characterized in that it comprises a speed control unit 107 for automatically accelerating from the distance progress point set in the.

According to the present invention, due to the overlap welding of the material welding portion of the temper rolling process can reduce the center mark generated in the moving material in the weld zone between the running, it is possible to prevent the damage of the work roll, Therefore, there is an effect that can increase the surface quality of the cold-rolled final product of the continuous plating line.

Description

Rolling Force and Line Speed Control Device in the Weld Section of Material {AN APPARATUS FOR CONTROLLING ROLL FORCE AND LINE SPEED IN STRIP WELDING ZONE}

The present invention relates to a rolling force and a line speed control device of the skin pass mill in the weld zone, in particular, while reducing the rolling force control section to the minimum at the point where the weld passes through the rough mill, By applying the minimum rolling force to control, due to the overlap welding of the material welding part of the temper rolling process, it is possible to reduce the center mark generated in the moving material in the welding section of the running, and to prevent the damage of the rolling roll, Accordingly, the present invention relates to a rolling force and a line speed control device in a material welded section capable of increasing the surface quality of a cold rolled final product of a continuous plating line.

In general, in the annealing process, the material 1 having different thicknesses, widths, and steel grades is welded in a welder, and then continuously annealed so that the raw material 1 is output through a temper rolling mill (SPM). At this time, the part where the material of different thickness, width and steel type is welded is called a welding section. The welding section is overlapped because the welding section overlaps the distal end of the leading coil and the trailing coil. Lap) is generated.

1 is a block diagram of a conventional continuous plating line temper rolling mill control system.

Referring to FIG. 1, in the conventional method of controlling a rolling mill 100, when rolling data for each material is sent from a supervisor control computer (SCC) 101 to a programmable logic computer (PLC) 103, the PLC 103 is controlled. ), The rough rolling mill 100 is sent to the rolling force adjusting unit 104 to perform rolling through the rough rolling mill 100.

Figure 2 is a process diagram of the conventional welding section passing through the temper mill.

Referring to FIG. 2, a portion in which the material 1 having different thicknesses, widths, and steel grades are welded and connected is referred to as a weld section, and the weld section includes a preceding coil 5 by a welder 7 at the line inlet. Since welding is performed by overlapping the distal end of the coil and the distal end material 1 of the trailing coil 5, the weld 11 generates an overlap 11 (Over Lap) as shown in FIG. 3. Then, after continuous annealing and rolling in the temper rolling mill 100, the demand is cut according to the order in the rearmost cutter 4 (Flying Shear) of the process. The temper mill (100) process is controlled by the supervisor control computer (101), in particular rolling data (for example, tension (tension, rolling force, line) for each material to secure the shape and elongation of the product Speed, bending force, etc.) Here, in # 4TBR and # 5 TBR shown in Fig. 2, TBR is an English abbreviation of tension bride roll and adjusts tension. Do this.

3 is an explanatory view of a conventional welding part rolling force and line speed control.

Referring to FIG. 3, in the conventional method, rolling is performed to the welding portion of the raw material 1 using the rolling data received from the upper computer 101, so that when the overlap 11 of the weld portion passes through the temper rolling mill 100, the rolling roll is rolled. The mark 11 (aka center mark) of the overlap 11 transferred to (3) leaves the remaining shape on the rolling roll 3, and the remaining shape remaining on the rolling roll 3 is that the rolling roll 3 When rotating and causing contact with the raw material 1, it causes a center mark 12 on the surface of the rolling roll 3 in contact with the raw material 1, the surface of the rolling roll (3) caused the center mark 12 The center mark 12 is reversely transferred from the rolling roll 3 to the material 1 when it is again encountered with the surface of the material 1.

In general, when the center mark 12 has a roll diameter of 500 mm, the center mark 12 is generated until the rotational speed 300 to 350, and thus an average of about 500 M is generated, and the occurrence of the center mark 12 is not reduced. At the time when the damaged rolling roll (3) to replace the occurrence of the center mark (12) to remove the rolling roll (3) caused a problem that should be performed from time to time according to the situation of the center mark (12).

Figure 4 is a graph of the rolling force when the conventional weld zone passes the temper rolling mill.

Referring to FIG. 4, the conventional technique is to reduce the rolling force to 150 tons two seconds before the welding unit passes the temper rolling mill 100, and to work on the welding unit, and restore the original state to the normal rolling force again after two seconds after the welding unit. It was intended to prevent the center mark 12 generated by this, even in this case, the center mark 12 still occurred because the rolling force is a large force applied to the material.

In this conventional control method, in order to secure the shape and elongation of the raw material 1 in the rolling data value currently being rolled in the roughing mill 100, the rolling force is rolled at an average of 300 tons, and the rolling force is 300 tons. There is a problem that the center mark 12 is generated in the material 1 by the impact generated when the welded portion overlap 11 passes.

The present invention has been proposed to solve the above problems, and its object is to reduce the rolling force control section to the minimum at the point where the weld passes through the temper rolling mill and to control by applying the minimum rolling force during the control section. Due to the overlap welding of the material welding part of the rolling process, it is possible to reduce the center mark generated in the moving material in the welding part section during driving, and to prevent the damage of the rolling roll, and thus the surface quality of the cold rolled final product of the continuous plating line. It is to provide a rolling force and line speed control device in the material welding section that can increase the.

In order to achieve the above object of the present invention, the temper rolling mill and line speed control apparatus of the present invention

In the rolling force and line speed control apparatus of a temper mill, which uses a rolling data including the thickness information of each material from the host computer, the raw material including the welded portion overlapped with the leading end and the trailing end

A welding part tracking part installed in the entrance part of the temper mill and detecting a welding part of a material having a material tracking hole in advance;

A length calculation unit for detecting rotation of the material feed roller from the time of detection of the welding unit by the welding unit tracking unit and calculating a distance between the welding unit and the temper mill based on the rotation;

A variable rolling force setting unit for selectively providing a predetermined normal rolling force or a rolling force value for a weld before a predetermined distance to reach the temper rolling mill according to a setting variable control signal;

While controlling the rolling force and the line speed based on the rolling data from the host computer, during the detection of the welded portion, the rolling force is controlled to the rolling force value set by the variable rolling force setting for a predetermined time period, A PLC controlling the welding unit at different line speeds step by step for a predetermined period before and after passing through the temper mill;

According to the control of the PLC, the rolling force adjustment unit for adjusting the rolling force by dividing the rolling force of the temper rolling mill into a rolling force and a normal rolling force when passing through the weld; And

Under the control of the PLC, when the weld is detected by the weld tracking part, the line speed is first reduced, and the weld detected by the length calculator is second at the point before the predetermined distance passing through the temper mill. And a speed controller for automatically decelerating from the predetermined distance progress point after passing through the temper mill.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.

5 is a configuration diagram of a continuous plating line temper rolling mill and line speed control apparatus according to the present invention, referring to FIG. 5, the temper mill rolling force and line speed control apparatus according to the present invention from the upper computer 101. As a rolling force and line speed control device of a temper mill (100) for rolling a material including a welded portion in which the leading end and the trailing end are overlapped by using the rolling data including the thickness information for each material of the It is done as follows.

The temper mill rolling force and line speed control device of the present invention is provided in the inlet side of the temper mill 100, the welding part tracking unit 105 for detecting a weld of a material having a material tracking hole in advance, and the welding unit From the time of the welding part detection by the tracking part 105, the rotation of the material feed roller is detected, and the length calculation part 106 which calculates the distance between the said welding part and the said temper mill 100 based on this rotation, and setting A variable rolling force setting unit 102 for selectively providing a predetermined normal rolling force according to a variable control signal or a rolling force value for a weld before a predetermined distance before reaching the temper mill 100; While controlling the rolling force and line speed based on the rolling data from the PLC 103 and the PLC 103 for controlling the rolling force at a predetermined rolling force value, and controlling the rolling force at different line speeds step by step for a predetermined period before and after the welding unit passes through the rough rolling mill 100. According to the control, the rolling force adjustment unit 104 for controlling the rolling force by dividing the rolling force of the temper rolling mill 100 into the rolling force and the normal rolling force at the time of passing the weld, and the control of the PLC 103 When the welding part is detected by the welding part tracking part 105, the line speed is first reduced, and the distance before the welding part detected by the length calculating part 106 passes through the temper mill 100 in advance. Decelerating to the second, and then the welding unit includes a speed control unit 107 for automatically accelerating from the predetermined distance advance point passing through the temper mill (100).

Preferably, the rolling force adjusting unit 104 controls the rolling force to about 80 tons from about 0.5M point before passing the rough rolling mill 100 under the control of the PLC 103, and the rough rolling mill ( 100) The rolling force is controlled to a normal rolling force at about 80 tons from about 0.5M progression point after passing.

Preferably, the speed control unit decelerates the line speed to approximately 60 MPM primarily when the welding unit is detected by the welding unit tracking unit 105 under the control of the PLC 103, and the length calculating unit 106 is performed. Detects by the second to about 30MPM second from the distance before the predetermined distance before passing through the temper mill 100, and then the weld passes through the temper mill 100 from the preset distance progress point It is made to auto accelerate.

More preferably, the speed control unit decelerates the line speed to approximately 60 MPM primarily when the welding unit is detected by the welding unit tracking unit 105 under the control of the PLC 103, and the length calculating unit 106. 2) decelerates to approximately 30 MPM at a point approximately 1.5 M before passing through the rough rolling mill 100, and then automatically accelerates from approximately 0.5 M passing through the rough rolling mill 100. To be made.

Hereinafter, the operation and effects of the present invention will be described in detail with reference to the accompanying drawings.

The temper rolling mill and line speed control apparatus of the present invention uses a rolled data including thickness information for each material from the upper computer 101, and includes a welded portion in which the leading end and the trailing end are overlapped. As a rolling force and line speed control device of the temper rolling mill 100, that is, a section in which the material 1 of different thicknesses, widths, and steel grades are welded in the process of the temper rolling mill 100 is called a welding section. Before the welded section enters the temper mill 100, the rolling force variable setting unit 102 varies the rolling force to control the rolling force of the temper mill.

Referring to FIG. 5, the welding part tracking part 105 of the present invention is installed at the inlet part of the temper rolling mill 100 to detect a welding part of a material having a material tracking hole in advance. The welding part tracking part 105 For example, the welding part tracking unit 105 includes a light emitting sensor and a light receiving sensor capable of detecting a material tracking hole, so that the light receiving sensor receives light from the light emitting sensor when the material tracking hole passes. It is possible to immediately detect the welded part having the material tracking hole.

In other words, the welding part tracking unit 105 of the present invention is the end point of the trailing end of the preceding material and the trailing material, which is currently being rolled on the basis of the temper rolling mill 100, after welding two coils at the inlet side. It is a weld formed for When the welding part of the material passes through the welding part tracking part 105 at the entrance part of the temper rolling mill 100 which is just before the welding part passes through the temper mill 100, the tracking error is reset for accurate control.

The length calculating unit 106 of the present invention detects the rotation of the material feed roller from the time of the welding part detection by the welding part tracking unit 105, and based on the rotation, the distance between the welding part and the temper mill 100 In other words, when the error is reset in the weld tracking unit 105, the distance between the weld tracking unit 105 and the temper rolling mill 100 is calculated, and at this time, the pulse generator attached to calculate the length Convert the pulse value rising from (PLG) to distance. In the current material, the weld position gradually approaches the temper mill 100.

6 is an exemplary view of a variable rolling force setting unit according to the present invention.

5 and 6, the variable rolling force setting unit 102 of the present invention is welded before the predetermined normal rolling force or a predetermined distance before reaching the temper rolling mill 100 according to the setting variable control signal Optionally provide a rolling force value for. For example, at the time of normal rolling in which the weld water does not pass, the rolling force is controlled by the rolling force value from the host computer 101 or the set value through the screen manipulation unit, and in the following PLC 103, the welding unit tracking unit 105 Thus, upon detection of the welded portion, the variable variable control signal is provided to the rolling force variable setting unit 102 for a predetermined time. Here, the time set in advance means about 0.5M point before the rough rolling mill 100 passes, and about 0.5M progressing point after the rough rolling mill 100 passes, as described below.

7 is a process diagram in which the weld section passes through the temper mill according to the present invention.

5 to 7, the PLC 103 of the present invention controls the rolling force and the line speed based on the rolling data from the host computer, and the rolling force during a predetermined time when the welding part is detected. The rolling force is controlled by the rolling force value set by the variable setting unit 102, and the welding force is controlled at different line speeds step by step during a predetermined period before and after the welding unit passes through the temper mill 100. Here, the period set in the circumstances is the time from the time when the weld is detected by the weld tracking unit 105, from the time the weld passes through the temper mill 100 to the preset distance advance point as described below. Corresponds to

8 is an explanatory view of the welding portion rolling force and line speed control according to the present invention,

5 to 9, the rolling force adjusting unit 104 according to the present invention controls the rolling force of the temper rolling mill 100 and the normal rolling force when passing through the welded part under the control of the PLC 103. To adjust the rolling force, more specifically, the rolling force adjusting unit 104, according to the control of the PLC 103, the rolling force from about 0.5M point before passing the rough rolling mill 100 approximately 80 tons, and after the rough rolling mill 100 passes through the rolling force from about 0.5M progress point to control the normal rolling force at about 80 tons.

According to the control of the PLC 103, the speed control unit 107 of the present invention decelerates the line speed primarily when the welding unit is detected by the welding unit tracking unit 105, and is detected by the length calculating unit 106. The welded part is decelerated secondly at a point before a predetermined distance before passing through the temper mill 100, and then the weld part is automatically accelerated from a preset distance progression point through the temper mill 100.

9 is a flowchart illustrating a deceleration control according to the present invention.

5 to 9, the speed control unit preferably controls the primary deceleration to approximately 60 MPM and the secondary deceleration to approximately 30 MPM. In addition, the speed controller sets the second deceleration time point to about 1.5 M before the welding unit detected by the length calculating unit 106 passes through the temper mill 100, and accelerates the second deceleration time point at the second deceleration time. The welded part passes through the temper rolling mill 100 to approximately 0.5M point. Here, the reason why the line speed is set to approximately 60 MPM for the first line and approximately 30 MPM for the second line is based on the experimentally calculated results of improving the workability of the continuous line and controlling the rolling force control stably at 30 MPM within 1 M. It is based.

As mentioned above. In the present invention, in the welding section as described above, in the rolling force variable setting unit 102, the welding force of the line and the trailing material is set to a rolling force of approximately 80 tons about 0.5M before passing through the temper mill 100. Here, the reason why the rolling load is set to about 80 tons in the variable setting unit 102 is obtained by performing various thicknesses, widths, and steel grades. The least amount of impact applied to the rolling roll 3 due to the thickness overlap 11 section of the coil 5 was found to be the most stable return of the normal rolling force after passing through the weld, and thus the rolling roll 3 It was confirmed experimentally that the reverse transcription did not occur with the material 1 in Ez. Then, the welding unit is set so that the rolling force is carried out to the normal rolling force at 80 tons when moving about 0.5M after passing the rough rolling mill 100.

EXAMPLE

10 is a graph of the rolling force value when the welded section passes through the temper mill according to the present invention.

In FIG. 10, the working situation for the material having all steel grades and thicknesses at the time when the weld passes the rough rolling mill 100 is approximately 80 tons of rolling force. The section where the rolling force is applied to 80 tons is controlled at 1M, the minimum length, thereby reducing the occurrence of the center mark 12.

11 is a center mark generation length graph according to the present invention.

In FIG. 11, a graph showing the length of the center mark 12 generated in all such steel grades and materials shows that the center mark 12 occurs within a maximum of 3M similar to the circumference of the rolling roll 3 for all materials. Giving.

According to the present invention as described above, in the rough rolling mill 100 to determine the surface quality of the cold-rolled final product to prevent the occurrence of the center mark (12) generated when the weld passes, the amount of scrap generated in the weld section is coil (5) 10M per sheet, reduced to 1M, and also has the effect of protecting the rolling roll (3), in practice, the generation of the center mark (12) is performed 300 to 350 times based on the diameter of the rolling roll (500) 500 Although the average length was about 500M, the present invention had the effect of generating about 1-2 times (1.5-3M) on the same basis as in the prior art. Comparing the present invention with the conventional one as shown in Table 1 below.

division Conventional The present invention Center mark occurrence length 500M average per coil 1.5-3M per coil Scrap generation length of welded section 10M per coil 1M per coil

According to the present invention as described above, at the time when the welded part passes the temper rolling mill, the rolling force control section is reduced to the minimum and the minimum rolling force (eg, 80 tons) is applied during the control section (eg: 1M). Therefore, due to overlap welding of the material welding part of the temper rolling process, it is possible to reduce the center mark generated in the moving strip in the welding part section during driving, and to prevent damage of the work roll. Therefore, there is an effect that can increase the surface quality of the cold-rolled final product of the continuous plating line.

The above description is only a description of specific embodiments of the present invention, and the present invention is not limited to these specific embodiments, and various changes and modifications of the configuration are possible from the above-described specific embodiments of the present invention. It will be apparent to those skilled in the art to which the present invention pertains.

1 is a block diagram of a conventional continuous plating line temper rolling mill control system.

Figure 2 is a process diagram when the conventional weld section passes through the temper mill.

3 is a diagram illustrating a conventional welding part rolling force control.

Figure 4 is a graph of the rolling force when the conventional weld zone passes the temper rolling mill.

5 is a block diagram of a continuous plating line temper rolling mill rolling force and line speed control apparatus according to the present invention.

6 is an exemplary view of a variable rolling force setting unit according to the present invention.

7 is a process diagram in which the weld section passes through the temper mill according to the present invention.

8 is an explanatory view of the welding portion rolling force and line speed control according to the present invention.

9 is a flowchart illustrating a deceleration control according to the present invention.

10 is a graph of the rolling force value when the welded section passes through the temper mill according to the present invention.

11 is a center mark generation length graph according to the present invention.

Explanation of symbols on main parts of drawing

1: Strip 2: Roll Force

3: Roll Roll 4: Cutting Machine (F / S: Flying Shear)

11: Over Lap (11) 12: Center Mark

100: Skin Pass Mill 101: Top Computer

102: variable rolling force setting unit 103: PLC

104: rolling force adjusting unit 105: welding part tracking part

106: length calculation unit 107: speed control unit

Claims (4)

Rolling force and line of the temper rolling mill 100 for rolling a material including a welded portion in which the leading end and the trailing end are overlapped using the rolling data including the thickness information for each material from the upper computer 101. In the speed control device, A welding part tracking part 105 installed at the entrance part of the temper rolling mill 100 to detect a welding part of a material having a material tracking hole in advance; A length calculation unit (106) for detecting the rotation of the material feed roller from the time of the welding part detection by the welding part tracking part (105) and calculating the distance between the welding part and the temper rolling mill (100) based on the rotation; A variable rolling force setting unit 102 for selectively providing a predetermined normal rolling force or a rolling force value for a welding part before a predetermined distance before reaching the temper mill 100 according to a setting variable control signal; During the control of the rolling force and the line speed based on the rolling data from the host computer, the rolling force is controlled by the rolling force value set by the rolling force variable setting unit 102 for a predetermined time when the welding portion is detected. In addition, the PLC 103 for controlling at a different line speed step by step for a predetermined period before and after the welding unit passes through the temper mill (100); According to the control of the PLC (103), the rolling force adjustment unit 104 to adjust the rolling force by dividing the rolling force of the temper mill 100 into the rolling force and the normal rolling force when passing through the weld; And Under the control of the PLC 103, when the welded portion is detected by the welded tracker 105, the line speed is first reduced, and the welded portion detected by the length calculator 106 is applied to the temper mill 100. Speed control unit 107 to decelerate secondly at a point before a predetermined distance to pass through, and then the welding unit passes through the temper mill 100 and automatically accelerates from a preset distance progress point. Rolling force and line speed control device in the material welding section characterized in that it comprises a. According to claim 1, wherein the rolling force adjusting unit 104 According to the control of the PLC 103, the rolling force is controlled to 80 tons from 0.5M point before passing the crude rolling mill 100, and the rolling force is 80 tons from 0.5M progressing point after passing the crude mill 100 through Rolling force and line speed control device in the material welding section, characterized in that the control to the normal rolling force. The method of claim 1, wherein the speed control unit Under the control of the PLC 103, when the welded portion is detected by the welded tracker 105, the line speed is first reduced to 60MPM, and the welded portion detected by the length calculator 106 is used for the temper rolling mill. Material which is made to decelerate to 30MPM in a second direction at a distance before a predetermined distance before passing through 100, and then the welding unit passes through the temper mill 100 to automatically accelerate from a predetermined distance progress point. Rolling force and line speed control device in welding section. The method of claim 1, wherein the speed control unit Under the control of the PLC 103, when the welded portion is detected by the welded tracker 105, the line speed is first reduced to 60MPM, and the welded portion detected by the length calculator 106 is used for the temper rolling mill. Rolling in the material welded section, characterized in that to reduce the second to 30MPM from 1.5M before passing through the 100, and then the welded part passes through the temper mill 100 to automatically accelerate from 0.5M point. Power and line speed control.