阅读说明：本技术 热轧生产线的楔形控制装置 (Wedge-shaped control device of hot rolling production line ) 是由 北乡和寿 于 2019-02-14 设计创作，主要内容包括：本发明的课题是在实施楔形的动态控制的过程中,一边抑制轧制变得不稳定,一边实现目标楔形。热轧生产线的楔形控制装置具备以下的构成。调平量计算部(1a)计算各机架的控制操作端(42)的基准调平量ΔS<Sub>i</Sub><Sup>SET</Sup>。跟踪部(1e)在被轧制材(4e)上设定跟踪点,并对该跟踪点进行跟踪。调平操作部在跟踪点到达各机架的定时实施动态控制,该动态控制使用以上述调平修正量ΔS<Sub>d(i)</Sub>对基准调平量ΔS<Sub>i</Sub><Sup>SET</Sup>进行校正所得的最终调平量ΔS<Sub>ref(i)</Sub>来依次控制对象机架(i(1≤i≤N))的控制操作端。而且调平操作部(1b)在实施动态控制过程中产生了轧制不稳定因素的情况下,至少将最终机架(N)的调平修正量ΔS<Sub>d(N)</Sub>设为0。(The invention aims to realize a target wedge while suppressing unstable rolling in the process of dynamic control of the wedge. The wedge control device of the hot rolling line has the following structure. A leveling amount calculation unit (1a) calculates a reference leveling amount [ Delta ] S of a control operation end (42) of each rack i SET . A tracking unit (1e) sets a tracking point on a rolled material (4e) and tracks the tracking point. Timing when leveling operation part reaches each rack at tracking pointApplying dynamic control using the above-mentioned leveling correction amount DeltaS d(i) To reference leveling quantity Delta S i SET Final leveling amount Δ S obtained by performing correction ref(i) To sequentially control the control operation end of the object rack (i (1 ≦ i ≦ N)). When a rolling instability factor is generated during the dynamic control, the leveling operation part (1b) at least adjusts the leveling correction amount Delta S of the final stand (N) d(N) Is set to 0.)

1. A wedge control device for a hot rolling line is provided with: a finishing mill having N stands for continuously rolling a rolled material, each stand having a control operation end for controlling a wedge shape of the rolled material based on a leveling amount, wherein N is not less than 2; and a plate profile measuring device provided on the discharge side of the finishing mill for measuring the wedge shape of the rolled material,

the wedge control device for a hot rolling line is characterized by comprising:

a leveling amount calculating part for calculating a reference leveling amount Delta Si of the control operation end of each frame based on the product specification of the rolled material^SETAnd influence coefficient c for dynamic control_iCalculating;

a tracking unit configured to set a tracking point on the rolled material and perform tracking until the tracking point reaches the sheet profile measuring device; and

a leveling operation part for controlling the influence coefficient c for dynamic control after the top end of the rolled material passes through the plate profile measuring device_iLeveling correction amount Δ S for each frame_d(i)Calculating the leveling correction amount Delta S of each frame_d(i)The leveling operation part is used for implementing dynamic control by using the leveling correction amount Delta S when the tracking point reaches each frame by setting the deviation between the wedge measured by the plate outline measuring device and the target value as 0_d(i)For the above reference leveling quantity Delta S_i ^SETFinal leveling amount Δ S obtained by performing correction_ref(i)Sequentially controlling the control operation ends of the object frame i, and satisfying 1 ≤ i ≤ N,

when a roll instability factor occurs during the dynamic control, the leveling operation unit adjusts at least the leveling correction amount Δ S of the final stand N_d(N)Is set to 0.

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

further comprising a flatness measuring device provided on the discharge side of the finishing mill for measuring the one-side elongation of the rolled material,

in the dynamic control, when the one-side elongation of the rolled material occurs and the leveling correction amount tends to deteriorate the one-side elongation, the leveling operation unit may set at least the leveling correction amount Δ S of the final stand N to the leveling correction amount Δ S_d(N)Is set to 0.

3. The wedge control apparatus of a hot rolling line according to claim 1 or 2,

and a control operation end intervention part which can change the leveling amount of each rack by an operator,

the polarity of the leveling amount of the target frame i changed by the operator and the leveling correction amount Δ S_d(i)When the polarities of the target stands are different from each other, the tracking unit sets a new tracking point B on the rolled material positioned in the target stand i,

in the dynamic control, when the tracking point B is set, the leveling operation unit adjusts the leveling correction amount (Δ S) of the target frame i and each frame downstream thereof until the tracking point B reaches the board profile measuring device_d(i+1)、……、ΔS_d(N)) Is set to 0.

4. The wedge control device for a hot rolling line according to any one of claims 1 to 3,

the tracking section sets a new tracking point C at a dynamic plate thickness change point of the material to be rolled on the upstream side of the feed side of the finishing mill,

when the tracking point C is set, the leveling amount calculating unit adjusts the reference leveling amount (Δ S) of each stand until the tracking point C reaches the plate profile measuring device from the feed side of the finishing mill₁ ^SET、……、ΔS_N ^SET) Set to the actual value of the current leveling amount of the control operation terminal,

in the dynamic control, when the tracking point C is set, the leveling operation unit adjusts the leveling correction amount (Δ S) of each stand until the tracking point C reaches the plate profile measuring device from the feed side of the finishing mill_d(1)、……、ΔS_d(N)) Is set to 0.

5. The wedge control device of a hot rolling line according to any one of claims 1 to 4,

further comprising a feed side thermometer provided on the feed side of the finishing mill for measuring the feed side temperature of the rolled material,

the tracking unit sets a new tracking point D on the rolled material on the feed side of the finishing mill when the temporal change in the temperature on the feed side is greater than a temperature distribution change threshold value,

when the tracking point D is set, the leveling amount calculating unit adjusts the reference leveling amount (Δ S) of each stand until the tracking point D reaches the plate profile measuring device from the feed side of the finishing mill₁ ^SET、……、ΔS_N ^SET) Set to the actual value of the current leveling amount of the control operation terminal,

in the dynamic control, when the tracking point D is set, the leveling operation unit adjusts the leveling correction amount (Δ S) of each stand until the tracking point D reaches the plate profile measuring device from the feed side of the finishing mill_d(1)、……、ΔS_d(N)) Is set to 0.

6. The wedge control device for a hot rolling line according to any one of claims 1 to 5,

further comprising a feed side plate profile measuring device provided on the feed side of the finishing mill for measuring a feed side wedge of the rolled material,

when the temporal change of the wedge on the feed side is larger than a wedge change threshold, the tracking unit sets a new tracking point E on the rolled material on the feed side of the finishing mill,

when the tracking point E is set, the leveling amount calculating unit adjusts the reference leveling amount (Δ S) of each stand until the tracking point E reaches the plate profile measuring device from the feed side of the finishing mill₁ ^SET、……、ΔS_N ^SET) Set to the actual value of the current leveling amount of the control operation terminal,

in the dynamic control, when the tracking point E is set, the leveling operation unit adjusts the leveling correction amount (Δ S) of each stand until the tracking point E reaches the plate profile measuring device from the feed side of the finishing mill_d(1)、……、ΔS_d(N)) Is set to 0.

Technical Field

The invention relates to a wedge (wedge) control device of a hot rolling production line.

Background

In a hot rolling line, the wedge shape of the sheet is an important quality item to be controlled. The control transmission is leveled and needs to be controlled within a range where the flatness between the frames is not deteriorated.

Fig. 2 is a diagram for explaining the definition of the wedge shape. As shown in fig. 2, the wedge shape is a difference in plate thickness between both ends in the width direction of the material to be rolled (formula 1). Of the two ends in the width direction, the side where the operator room is located is referred to as a working side, and the side where the driving device is placed is referred to as a driving side. As the reference position, a position 40mm inward from the end of the plate width is often used.

[ equation 1 ]

W₄₀＝h_W40-h_D40(1)

Here, the first and second liquid crystal display panels are,

w40: wedge shape [ mm ]

h_W40: thickness of working side plate (position 40mm from end of working side plate) [ mm]

h_D40: thickness of drive side plate (position 40mm from end of drive side plate) [ mm]

Fig. 3 is a diagram for explaining the definition of the leveling amount. As shown in fig. 3, the leveling amount is the difference between the roll gap on the work side and the roll gap on the drive side of the rolling mill (equation 2).

[ equation 2 ]

ΔS_L＝S_WS-S_DS(2)

Here, the first and second liquid crystal display panels are,

ΔS_L: leveling amount [ mm ]]

S_Ws: working side roll gap [ mm ]]

S_DS: drive side roll gap [ mm ]]

The wedge shape appears due to asymmetry of the rolling mill and asymmetry of the widthwise thickness distribution of the rolled material, and also due to asymmetry of the load distribution applied to the rolled material caused by temperature unevenness, shift of the center position, or the like. Therefore, there has been an attempt to eliminate the wedge by the difference in the roll gap between the left and right, i.e., performing a leveling operation.

Disclosure of Invention

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a wedge control device for a hot rolling line, which can realize a target wedge while reducing a phenomenon that rolling becomes unstable, such as meandering and one-side elongation of a material to be rolled, and realizing stable rolling, when dynamic control of a wedge is performed in which a leveling amount is corrected based on a measured value of the wedge.

Means for solving the problems

To achieve the above object, the wedge control device of a hot rolling line according to the present invention is configured as follows.

A hot rolling line is provided with a finishing mill and a plate profile measuring device. The finishing mill has N (N is not less than 2) stands for continuously rolling a material to be rolled. Each stand has a control operation end for controlling the wedge shape of the rolled material based on the leveling amount. The plate profile measuring device is provided on the discharge side of the finishing mill and measures the plate thickness distribution in the plate width direction including the wedge shape of the material to be rolled.

The wedge control device is provided with a leveling amount calculation unit, a tracking unit, and a leveling operation unit.

The leveling amount calculating part calculates a reference leveling amount Delta S for the control operation end of each stand based on the product specification of the rolled material_i ^SETAnd influence coefficient c for dynamic control_iAnd (6) performing calculation.

The tracking unit sets a tracking point on the rolled material and performs tracking until the tracking point reaches the sheet profile measuring device.

Leveling operation part based on influence coefficient c for dynamic control after the top end of the rolled material passes through the plate outer shape measuring device_iA leveling correction amount Delta S for each frame for setting the deviation of the wedge measured by the plate profile measuring device from the target value to 0_d(i)And (6) performing calculation. Further, the leveling operation unit performs dynamic control using the leveling correction amount Δ S at the timing when the tracking point reaches each rack_d(i)To reference leveling quantity Delta S_i ^SETFinal leveling amount Δ S obtained by performing correction_ref(i)To sequentially control the control operation end of the object frame i (i is more than or equal to 1 and less than or equal to N).

Accordingly, the operator can easily grasp the position of the rolled material after the leveling is changed by changing the leveling continuously and intermittently by changing the leveling by dynamic control from the upstream side.

In one embodiment, the leveling operation unit adjusts at least the leveling correction amount Δ S of the final stand N when a roll instability factor occurs during the dynamic control_d(N)Is set to 0. Examples of the timing at which the rolling instability can be sensed include: (1) detecting the single-side elongation of the rolled material at the discharge side of the finishing mill; (2) when the leveling amount is changed by the intervention of an operator; (3) when the dynamic plate thickness is changed; (4) detecting temperature distribution or wedge shape at feed side of finishing millWhen there is a sharp change.

In a preferred embodiment of the present invention, the hot rolling line further includes a flatness measuring device provided on the discharge side of the finishing mill and measuring the one-side elongation of the rolled material. In addition, when the one-side elongation of the rolled material occurs during the dynamic control and the leveling correction amount tends to deteriorate the one-side elongation, the leveling operation unit at least adjusts the leveling correction amount Δ S of the final stand N_d(N)Is set to 0.

Accordingly, when the occurrence of the one-side elongation on the discharge side of the final stand is detected, the leveling correction amount is not temporarily changed, and thus the deterioration of the one-side elongation of the material to be rolled can be suppressed.

In a preferable aspect of the hot rolling line for changing the leveling amount with intervention of an operator, the hot rolling line further includes a control operation end intervention section capable of performing an operation of changing the leveling amount with the operator on a control operation end of each stand. Then, the polarity of the leveling amount of the target frame i changed by the operator and the leveling correction amount Δ S_d(i)When the polarities of (a) and (B) are different, the tracking unit sets a new tracking point B on the rolled material positioned in the target stand i. In the dynamic control, when the tracking point B is set, the leveling operation unit adjusts the leveling correction amount (Δ S) of the target frame i and each frame downstream thereof until the tracking point B reaches the board profile measuring device_d(i+1)、……、ΔS_d(N)) Is set to 0.

Accordingly, when the operator intervenes, the change based on the leveling correction amount is not performed temporarily, and thereby the occurrence of a phenomenon in which rolling becomes unstable such as meandering and one-side elongation due to wedge control can be suppressed.

In a preferable embodiment for the dynamic gauge change, the tracking unit sets a new tracking point C at the dynamic gauge change point of the material to be rolled upstream of the feed side of the finishing mill. When the tracking point C is set, the tracking point C is set from the feed side of the finishing mill to the plate profile measuring deviceMeanwhile, the leveling amount calculation unit calculates a reference leveling amount (Δ S) of each frame₁ ^SET、……、ΔS_N ^SET) The actual value of the current leveling amount of the control operation terminal is set. In the dynamic control, when the tracking point C is set, the leveling operation unit adjusts the leveling correction amount (Δ S) of each stand until the tracking point C reaches the plate profile measuring device from the feed side of the finishing mill_d(1)、……、ΔS_d(N)) Is set to 0.

Accordingly, by temporarily controlling the leveling by using the actual value of the leveling amount at the control operation end at the time of the dynamic sheet thickness change, it is possible to suppress the occurrence of a phenomenon in which rolling becomes unstable such as meandering and one-side elongation.

In a preferable embodiment for a rapid change in the feed side temperature distribution of the finishing mill, the hot rolling line further includes a feed side thermometer provided on the feed side of the finishing mill and measuring the feed side temperature of the material to be rolled. When the temporal change in the feed-side temperature is greater than the temperature distribution change threshold, the tracking unit sets a new tracking point D on the material to be rolled on the feed side of the finishing mill. When the tracking point D is set, the leveling amount calculating unit adjusts the reference leveling amount (Δ S) of each stand until the tracking point D reaches the plate profile measuring device from the feed side of the finishing mill₁ ^SET、……、ΔS_N ^SET) The actual value of the current leveling amount at the control operation end is set. In the dynamic control, when the tracking point D is set, the leveling operation unit adjusts the leveling correction amount (Δ S) of each stand until the tracking point D reaches the plate profile measuring device from the feed side of the finishing mill_d(1)、……、ΔS_d(N)) Is set to 0.

In a preferred embodiment of the present invention, the hot rolling line further includes a feed side plate profile measuring device provided on the feed side of the finishing mill and measuring the feed side wedge of the material to be rolled. And, in the case that the time variation of the wedge of the following section on the feed side is larger than the wedge variation threshold value, the approach of the finishing millA new tracking point E is set on the rolled material on the material side. When the tracking point E is set, the leveling amount calculating part adjusts the reference leveling amount (Delta S) of each stand until the tracking point E reaches the plate profile measuring device from the feed side of the finishing mill₁ ^SET、……、ΔS_N ^SET) The actual value of the current leveling amount of the control operation end is set. In addition, when a tracking point E is set during the dynamic control, the leveling operation part adjusts the leveling correction amount (Delta S) of each stand until the tracking point E reaches the plate profile measuring device from the feed side of the finishing mill_d(1)、……、ΔS_d(N)) Is set to 0.

Effects of the invention

According to the wedge control device of the hot rolling line of the present invention, when dynamic control of the wedge is performed to correct the leveling amount based on the measured wedge value, it is possible to reduce the phenomenon that rolling becomes unstable, such as meandering and one-side elongation of the material to be rolled, and to realize the target wedge while realizing stable rolling.

Drawings

Fig. 1 is a configuration diagram of a wedge control device.

Fig. 2 is a diagram for explaining the definition of the wedge shape.

Fig. 3 is a diagram for explaining the definition of the leveling amount.

Fig. 4 is a diagram showing a configuration example of a hot rolling line according to a first embodiment of the present invention.

Fig. 5 is a diagram showing the leveling amount determination timing before the start of dynamic control.

Fig. 6 is a diagram showing the dynamic control start timing.

Fig. 7 is a diagram for explaining processing in the dynamic control.

Fig. 8 is a diagram showing the dynamic control end timing.

Fig. 9 is a time chart showing an example of the dynamic control of the wedge.

FIG. 10 is a time chart showing an example of control when one-side elongation of a material to be rolled is measured on the discharge side of a final stand.

Fig. 11 is a diagram for explaining processing at the time of operator intervention.

Fig. 12 is a time chart showing an example of control when an operator intervenes.

Fig. 13 is a diagram showing learning calculation timing.

Fig. 14 is a diagram for explaining processing at the time of changing the dynamic sheet thickness according to the second embodiment of the present invention.

Fig. 15 is a diagram showing a configuration example of a hot rolling line according to a third embodiment of the present invention.

Fig. 16 is a conceptual diagram illustrating an example of a hardware configuration of a processing circuit included in the wedge control device 1 according to each embodiment.

In the figure:

AF_actmeasured value of flatness

1 wedge control device

1a leveling amount calculating section

1b leveling operation part

1c control operation end intervention part

1d actual result collecting part

1e tracking unit

1f input unit

1g actual result holding part

1h leveling amount determining function

1i influence coefficient determining function

1j learning calculation function

1k display unit

4a finishing block

4b plate outline measuring device

4c flatness measuring device

4d coiling machine

4e rolled material

4f change point

4g leading part

4h backward part

Front shearing machine of 4i coiling machine

15a feeding side thermometer

15b feeding side plate shape measuring device

41 frame

42 control operation end

91 processor

92 memory

93 hardware

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, in the embodiments described below, when the number, the amount, the range, and the like of each element are mentioned, the present invention is not limited to the mentioned number except for the case where the number is specifically and clearly shown or the case where the number is clearly determined in principle. In addition, the configurations and the like described in the embodiments shown below are not necessarily essential to the present invention, except for the case where they are specifically and explicitly shown or the case where they are clearly determined to be the same in principle.