JP6428932B2 - Leading end plate width controller - Google Patents

Description

  The present invention relates to a leading end plate width control device. In particular, the present invention relates to a leading end plate width control device for controlling a reversible rolling mill equipped with an edger.

  In steel mills, continuous casters cast metal slabs. A metal slab that is a material to be rolled is rolled in a hot rolling line so as to have a desired product size and material. The hot rolling line includes a reversible rolling mill and a finish rolling mill. The reversible rolling mill rolls the material to be rolled to a size required for finish rolling in a downstream finish rolling mill. The finish rolling mill rolls the material to be rolled to the target product size.

  A reversible rolling mill for a hot rolling line is a pair of vertical rolls (Vertical Roll) that performs width rolling on a material to be rolled, and a horizontal roll that is provided downstream of the edger roll and is parallel to the material to be rolled. A pair of horizontal rolls for rolling is provided. The reversible rolling mill has a forward path for passing the material to be rolled from the upstream side (continuous casting machine side, heating furnace side) to the downstream side (finishing mill side) and the material to be rolled from the downstream side to the upstream side. Repeat the reverse path to pass. By repeating the forward pass and the reverse pass alternately, width rolling by a vertical roll (hereinafter also referred to as edger roll) and horizontal roll horizontal rolling are performed on the material to be rolled.

  Width rolling by edger rolls is the uniform temperature of the material to be rolled before the finish rolling process, the realization of width dimensions corresponding to various target plate widths, and the temperature formed in the heating stage of the material to be rolled in the heating furnace. This is performed to suppress fluctuations in the plate width due to differences (skid marks) and unsteady deformation of the leading end. In particular, since the active processing in the width direction (short direction) of the material to be rolled is performed only by a reversible rolling mill, it is one of important processes. In general, a reversible rolling mill repeats multiple times that width rolling and horizontal rolling are performed only in the forward pass and only horizontal rolling is performed in the reverse pass.

  In general, when width rolling is performed on a rectangular rolled material, the longitudinal cross-section in the width direction (short direction) of the rolled material is a dog-shaped bone (dogbone) that is raised in the thickness direction at the end in the width direction. Shape). After this, by performing horizontal rolling, this dogbone is rolled back in the thickness direction to return in the width direction (width return due to the dogbone), and spread in the width direction by horizontal rolling (width expansion by horizontal rolling) ), A material to be rolled wider than the gap between the pair of edger rolls (edger roll gap) is formed. For example, in Non-Patent Document 1, the width of the material to be rolled on the edger roll entry side, the plate thickness, the edger roll gap, and a pair of horizontal rolls. It is determined by the gap between them (horizontal roll gap) and the roll radius of the edger roll and horizontal roll. Non-Patent Document 1 is directed to a steady portion (a portion other than the leading end portion of the material to be rolled) that does not rapidly change in the longitudinal direction.

Japanese Patent Publication No. 4-13043

Japan Iron and Steel Institute, “Theory and Practice of Sheet Rolling”, revised edition, Sanwa, September 30, 2010, pp.73, 77

  By the way, when width rolling is performed with a constant edger roll gap, it is known that the plate width of the leading end of the material to be rolled is deformed into an unsteady shape on the exit side of the reversible rolling mill. When the unsteady shape generated at the leading end of the material to be rolled is remarkable, it is difficult to finish the plate by finish rolling, which may cause trouble. Further, this shape remains after finish rolling, and the plate width of the leading end portion of the material to be rolled is significantly lower than the plate width target value, so that it is cut off to ensure product accuracy. Therefore, the occurrence of a change in sheet width at the leading end of the material to be rolled leads to a significant decrease in yield.

  In width rolling by edger roll, sheet width control (edgeer opening degree change control of edger) that widens edger roll gap compared to steady part other than the leading edge only for the leading edge of the material to be rolled ) Is done. As shown in FIG. 6, the edger roll gap opening / closing operation amount (edger leading edge opening changing amount) in the conventional edger leading edge opening changing control is the edger positive path leading edge opening changing pattern. The generation unit 16 sets the value based on a mathematical expression or a pattern stored as a numerical table (edge edge opening degree change pattern of the edger). When setting based on the pattern stored as a numerical table, the stored pattern is searched using the steel type, sheet width, width reduction amount, sheet thickness, and the like as search keys. The number table is generally determined by trial and error.

  Conventionally, in a continuous casting machine, an operation for changing a width dimension of a metal slab to be cast is performed according to a required product dimension. Since the casting of the metal slab stops during the change period, the productivity decreases as the number of changes in the width dimension increases.

  In recent years, in the steel industry, in order to improve the production capacity of a continuous casting machine, the consolidation of the width dimension of the metal slab to be cast and the expansion of the width dimension have been promoted. Accordingly, it has become necessary to significantly reduce the metal slab to obtain a desired width dimension by reducing the metal slab in the width direction in hot rolling.

  The width reduction method in hot rolling includes width reduction by a sizing press that performs width reduction by a pair of press tools, in addition to width rolling by an edger roll. The width reduction by the sizing press has been increasingly adopted due to the feature that the reduction efficiency is good because the contact length with the material to be rolled can be increased during the width reduction, and that a large width reduction can be expected, and the demand in the steel industry in recent years. However, since the introduction and installation of the sizing press requires a space and a financial margin, there is a demand for realizing a significant reduction only by the width rolling by the edger roll.

  In order to achieve significant reduction by width rolling by edger roll, it is necessary to perform width rolling not only in the forward pass but also in the reverse pass. For example, Patent Document 1 discloses that, in a reversible rolling mill having a configuration in which two vertical rolls are arranged with a horizontal roll interposed therebetween, significant reduction is realized by repeating width rolling in a forward pass and a reverse pass. Yes. However, Patent Document 1 is a technique for suppressing the occurrence of a fishtail in which the tip end of the material to be rolled has a fish-tail shape, and no mention is made of improving the accuracy of the tip end plate width. Further, Patent Document 1 requires two vertical rolls across a horizontal roll, and does not support width rolling in the forward pass and the reverse pass using only one vertical roll.

  Conventionally, when rolling in the order of width rolling in the reverse pass, width rolling in the forward pass, and horizontal rolling in the forward pass (that is, horizontal rolling after continuous width rolling in the reverse pass and the forward pass) The edger opening degree change control of the edger is applied only in the width rolling in the forward pass, and the edger opening degree change control of the edger is not applied in the width rolling in the reverse pass. The tail end plate width after width rolling in the reverse path without applying the edger tip end opening change control is almost equal to the plate width of the steady portion, but the tip plate width is narrower than the steady portion. (This is referred to as width reduction). That is, the tip plate width of the material to be rolled is formed unevenly. Further, in the forward pass after the reverse pass, the width rolling is performed while the dog bone formed by the width roll in the reverse pass and the width drop of the tip portion remain. Here, since the width rolling is performed by applying the conventional edge end opening change pattern of the edger, the width of the leading end plate of the material to be rolled is formed more unevenly. That is, when width rolling is continuously performed in the reverse pass and the forward pass, it is necessary to perform some correction on the leading edge opening change pattern of the edger.

  As described above, when width rolling is continuously performed in the reverse pass and the forward pass, since the deformation phenomenon of the leading end is complicated, the opening / closing change pattern of the leading end of the edger is adjusted by trial and error. It was.

  The present invention has been made to solve the above-described problems. In width rolling in the forward pass after the reverse pass, the edge end opening change pattern of the edger is rationally determined, and the optimum edger is determined. It is an object of the present invention to provide a leading end plate width control device capable of performing width control by a leading end opening change pattern.

  In order to achieve the above object, the leading end plate width control device according to the present invention is configured as follows.

  The leading end plate width control device controls the reversible rolling mill. The reversible rolling mill includes an edger having a pair of vertical rolls that perform width rolling on a material to be rolled on a rolling line, and a pair of horizontal rolls that are provided downstream of the vertical roll and perform horizontal rolling on the material to be rolled. Is provided. The reversible rolling mill repeats a forward path through which the material to be rolled passes from the upstream side to the downstream side of the reversible rolling mill and a reverse path through which the material to be rolled passes from the downstream side to the upstream side. Perform both rolling and horizontal rolling.

  The leading end plate width control device includes a tracking unit, a path schedule calculating unit, a reverse path leading end opening changing pattern generating unit, a normal path leading end opening changing pattern generating unit, a reverse path distribution ratio calculating unit, an edger normal correcting unit. A path leading end opening changing pattern correcting unit and an edger leading end opening controlling unit are provided.

  The tracking means tracks the position of the material to be rolled on the rolling line.

  Based on the hot rolling instruction information, the pass schedule calculation means calculates the width reduction amount that is the difference between the edger entry side plate thickness, edger entry side plate width, edger exit side plate width, edger entry side plate width and edger exit side plate width in each pass. The roll gap of a pair of vertical rolls is calculated.

  The reverse path leading end opening change pattern generating means is based on the calculated value calculated by the path schedule calculating means, and the edger reverse path leading edge in the i-1th path (i is an odd number of 3 or more) which is the reverse path. The end opening change pattern is output. In the edger reverse path leading end opening change pattern, the roll gap of the vertical roll at the leading end of the material to be rolled is set wider than the roll gap at the steady portion other than the leading end. Moreover, the edger reverse pass leading end opening change pattern is set so that the plate width of the leading end portion of the material to be rolled after reverse pass rolling is not smaller than the plate width of the steady portion.

  Based on the calculated value calculated by the path schedule calculating unit, the normal path leading end opening changing pattern generating unit outputs an edger positive path leading end opening changing pattern in the i-th pass that is the normal path. In the edger positive path leading end opening change pattern, the roll gap of the vertical roll at the leading end of the material to be rolled is set wider than the roll gap at the stationary part other than the leading end.

  The reverse path distribution ratio calculation means calculates the reverse path distribution ratio by dividing the width reduction amount of the (i-1) -th path calculated by the path schedule calculation means by the width reduction amount of the i-th path.

  The edger forward path leading end opening change pattern correcting means includes a calculated value calculated by the path schedule calculating means, a reverse path distribution ratio calculated by the reverse path distribution ratio calculating means, and a material to be rolled calculated by the tracking means. Based on the position tracking information, the edger positive path leading end opening change pattern is corrected.

  The edger leading end opening control means is configured to calculate the leading end of the material to be rolled based on the edger reverse path leading end opening changing pattern, the corrected edger forward path leading end opening changing pattern, and the position tracking information. The roll gap of a pair of vertical rolls in the section is output.

  The edger changes the roll gap of the vertical roll based on the roll gap output from the edger leading end opening control means.

  Preferably, the leading end plate width control device includes learning means. Here, a tracking means acquires the board width actual value which the board width meter provided in the downstream of the reversible rolling mill measured for every position of the to-be-rolled material. The learning means corrects the corrected edger positive path leading end opening change pattern so that the deviation between the actual board width value measured by the board width meter and the target board width value becomes zero.

  According to the present invention, in a reversible rolling mill provided with a vertical roll only upstream of a horizontal roll, the edge end opening change pattern of the edger can be rationally determined for width rolling in the forward pass after the reverse pass, It is possible to perform width control by an optimum edger leading end opening change pattern. As a result, the accuracy of sheet width control in continuous width rolling in the reverse pass and the forward pass is improved, and a significant reduction is possible, and products with various target dimensions can be manufactured with high product dimensional accuracy. Moreover, the frequency | count of change of the width dimension of the metal slab cast with a continuous casting machine can be reduced, and the productivity of a continuous casting machine can also be improved.

It is a figure for demonstrating the outline of the reversible rolling mill of a hot rolling line, and the structure of the leading end board width control apparatus which controls an edger roll gap. It is a figure for demonstrating the edger positive path front end opening degree change pattern correction means 19. FIG. It is a top view for demonstrating the example which applied the edger reverse path leading end opening change pattern at the time of width rolling by a reverse path. It is a top view for demonstrating the example which applied the edger normal path leading end opening change pattern after correction | amendment at the time of width rolling in the normal path following a reverse path | pass. It is a figure which shows the hardware constitutions of the leading end board width control apparatus. It is a figure for demonstrating the conventional leading end width control.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
[System Configuration of Embodiment 1]
FIG. 1 is a diagram for explaining the outline of a reversible rolling mill for a hot rolling line and the configuration of a leading end plate width control device for controlling an edger roll gap.

(Reversible rolling mill)
The hot rolling line includes a reversible rolling mill 1. The hot rolling line includes a continuous casting machine and a heating furnace on the upstream side of the reversible rolling mill 1, and a finish rolling mill on the downstream side of the reversible rolling mill 1 (not shown). The continuous casting machine casts a metal slab according to the set width dimension. The metal slab that is the material to be rolled 5 is rolled in a hot rolling line so as to have a desired product size and material. The reversible rolling mill 1 rolls the material to be rolled 5 to a size necessary for finish rolling by a downstream finish rolling mill. The finish rolling mill rolls the material to be rolled 5 to a target product size.

  The reversible rolling mill 1 includes an edger 2 and a horizontal mill 3. The edger 2 includes a pair of vertical rolls (edger rolls) that perform width rolling on the material to be rolled 5. FIG. 1 shows the edger roll of the edger 2. The horizontal mill 3 is provided downstream of the edger 2 and includes a pair of horizontal rolls that perform horizontal rolling on the material to be rolled 5. FIG. 1 shows a horizontal roll of the horizontal mill 3.

  The edger 2 includes a hydraulic cylinder controlled by a hydraulic control device (HPC) 4. The roll gap (edger roll gap) of the pair of edger rolls of the edger 2 can be opened and closed (wide or narrow) in the width direction of the material to be rolled 5 according to the operation of the hydraulic cylinder. Although the reversible rolling mill 1 shown in FIG. 1 is provided with one edger 2 and one horizontal mill 3, it is not limited to this.

  The reversible rolling mill 1 has a forward path 7 (in the same direction as the conveying direction 6) that allows the material to be rolled 5 to pass from the upstream side (continuous casting machine side, heating furnace side) to the downstream side (finishing mill side) of the reversible rolling mill 1. ), And the reverse path 8 (the reverse direction to the normal path 7) for passing the material to be rolled 5 from the downstream side to the upstream side is repeated. The reversible rolling mill 1 performs both width rolling and horizontal rolling in each of the forward pass and the reverse pass.

  The material 5 to be rolled is rolled by the reversible rolling machine 1 (the total number of passes is N. N is an odd number equal to or greater than 3) and then provided on the downstream side (conveying direction 6) of the reversible rolling machine 1. It is conveyed to the finishing mill.

  In addition, in this specification, the front part of the advancing direction of the to-be-rolled material 5 is called a front-end | tip part in each pass, and the advancing direction rear part is called a tail end part. That is, in FIG. 1, in the normal pass, the right end portion of the material to be rolled 5 is the tip portion, and the left end portion is the tail end portion. In the reverse pass, the left end portion of the material to be rolled 5 is the tip portion, and the right end portion is the tail end portion. In FIG. 1, in the positive path, the left side of the edger 2 is referred to as an edger entry side, and the right side is referred to as an edger exit side. In the reverse path, the right side of the edger 2 is referred to as the edger entry side, and the left side is referred to as the edger exit side. Further, in FIG. 1, the left side of the reversible rolling mill 1 is referred to as the upstream side and the right side is referred to as the downstream side, regardless of the normal path and the reverse path.

  A roller table speed detector 9 and a hot piece detector (HMD) 10 are provided in front of the material to be rolled 5 entering the edger 2 and the horizontal mill 3 through the forward path 7 (upstream side of the edger 2). . The roller table speed detector 9 detects the rotational speed of the roller table that conveys the material to be rolled 5 in the hot rolling line. The hot piece detector 10 detects the material to be rolled 5 being conveyed. Further, the horizontal mill 3 is provided with a rotation speed detector 11 for detecting the rotation speed of the horizontal roll.

  The tracking means 12 tracks the position of the material to be rolled 5 on the hot rolling line based on signals from the roller table speed detector 9, the hot piece detector 10, and the rotational speed detector 11. Specifically, the tracking unit 12 generates position tracking information including the traveling direction of the material to be rolled and the conveyance position.

  A plate width meter 13 is provided on the downstream side of the horizontal mill 3. The sheet width meter 13 measures the actual sheet width after rolling (after rolling the N pass in the reversible rolling mill 1). The tracking means 12 acquires the actual board width value measured by the board width meter 13. The present invention is applicable even if the position and number of these sensors do not necessarily match those in FIG.

(Tail width control device for reversible rolling mill)
The edger 2 is controlled by the leading end plate width controller 21. The leading edge plate width control device 21 includes a tracking means 12, a path schedule calculating means 14, an edger forward path leading edge opening change pattern generating means 16a, an edger reverse path leading edge opening changing pattern generating means 16b, and a reverse path. The distribution ratio calculating means 18, the edger positive path leading end opening changing pattern correcting means 19, the learning means 20, and the edger leading end opening controlling means 17 are provided. Further, the leading end plate width control device 21 may include the HPC 4.

  Based on the hot rolling instruction information 15, the pass schedule calculation means 14 determines the edger entry side plate thickness, the edger entry side plate width, the edger exit side plate width, the width reduction amount, and the gap between the pair of vertical rolls of the edger 2. (Edger roll gap) is calculated. The width reduction amount [mm] is a difference between the edger entrance side plate width and the edger exit side plate width in each pass. The size [mm] of the edger roll gap is a distance between rolls in a pair of edger rolls, and is also referred to as an opening degree in this specification.

  The pass schedule calculation unit 14 receives the hot rolling instruction information 15 from the host computer. The hot rolling instruction information 15 includes information on the dimensions and steel types of the material to be rolled 5 before rolling, and information on target dimensions of the material to be rolled 5 after rolling (downstream of the reversible rolling mill 1 after N passes). . When the material to be rolled 5 reaches a predetermined position on the hot rolling line, the pass schedule calculating means 14 is based on the hot rolling command information 15 so that a product having a predetermined product size can be manufactured. Calculate the roll rotation speed and edger roll gap. Moreover, the pass schedule calculation means 14 calculates the target values of the edger entry side plate thickness, the edger entry side plate width, the edger exit side plate width, and the width reduction amount of the material 5 to be rolled for each pass.

  In the pass schedule calculation means 14, the edger roll gap (opening degree) in each pass is based on, for example, the plate thickness and width of the material to be rolled 5 before rolling and the target plate width after rolling (after N passes). Is calculated. The edger roll gap calculated by the pass schedule calculation unit 14 is a value corresponding to the target plate width of the steady portion (a portion other than the leading end) of the material 5 to be rolled in a predetermined pass.

  If the leading end of the material to be rolled 5 is rolled using the edger roll gap corresponding to the target plate width of the steady portion, the longitudinal direction of the material to be rolled 5 is affected by width rolling, and the leading edge Causes unsteady deformation (width reduction). It is necessary to suppress this unsteady deformation. The edger forward path leading end opening change pattern generating unit 16a generates an edger forward path leading end opening changing pattern to bring the leading end close to the target plate width, and the edger reverse path leading end opening degree pattern is generated. The change pattern generation means 16b generates an edger reverse path leading end opening change pattern.

  The edger forward path leading end opening change pattern generating unit 16a and the edger reverse path leading end opening changing pattern generating unit 16b are predetermined parameters (for example, a steel type included in the hot rolling command information, a path schedule calculating unit 14). A numerical table for storing the edge end opening change pattern of the edger corresponding to the calculated thickness (sheet thickness, sheet width, width reduction amount before rolling) of the material to be rolled 5 is stored. The edger positive path leading end opening changing pattern generating unit 16a searches the edger for the leading edge opening changing pattern of the edger corresponding to the predetermined parameter from the numerical table, and sets it as the edger positive path leading end opening changing pattern. Similarly, the edger reverse path leading end opening change pattern generating unit 16b searches the edger leading end opening changing pattern corresponding to the predetermined parameter from the numerical table, and the edger reverse path leading end opening changing pattern is obtained. And The leading edge opening change pattern of the edger is not necessarily retrieved from the numerical table, and may be calculated based on a mathematical expression.

  In the edger reverse path leading end opening change pattern, the roll gap of the vertical roll at the leading end of the material to be rolled is set wider than the roll gap at the steady portion other than the leading end. Moreover, the edger reverse pass leading end opening change pattern is set so that the plate width of the leading end portion of the material to be rolled after reverse pass rolling is not smaller than the plate width of the steady portion. That is, the width is set so as not to drop. In the edger positive path leading end opening change pattern, the roll gap of the vertical roll at the leading end of the material to be rolled is set wider than the roll gap at the stationary part other than the leading end.

  The edger leading end opening control means 17 sends a control signal to the HPC 4 for each position of the material to be rolled 5 so that the edger roll gap is changed according to the edger leading end opening changing pattern. The edger leading end opening control means 17 is a rolling material 5 obtained from the data obtained by adding the edger leading end opening changing pattern to the edger roll gap calculated by the path schedule calculating means 14 and the position tracking information. Based on this position, a control signal for changing the edger roll gap according to the position of the material to be rolled 5 is output. The HPC 4 operates the hydraulic cylinder according to the control signal and changes the edger roll gap of the edger 2.

  The leading end plate width control device 21 according to the present embodiment includes a reverse path distribution ratio calculating unit 18 and an edger forward path leading end opening changing pattern correcting unit 19 in addition to the above-described configuration.

  FIG. 3 is a top view for explaining an example in which an edger reverse path leading end opening change pattern is applied during width rolling in the reverse path. A broken line 31 shows a pattern in which the edger roll gap is constant (the edger roll gap is fixed to a value corresponding to the target plate width of the stationary part). A solid line 32 shows an edger reverse path leading end opening change pattern. If the edger roll gap is constant during the width rolling in the reverse pass, as shown by the broken line 33, the plate width of the tail end after the reverse pass rolling is substantially equal to the plate width of the steady portion, but the tip portion Falls off.

  Here, when the width reduction amount in the width rolling in the reverse pass is large, the width drop generated at the tip portion of the material to be rolled 5 becomes large, so that the plate width is larger than the edger gap in the width rolling in the next normal pass. There is a risk of narrowing. In this case, the effect of sheet width control in width rolling in the normal pass cannot be exhibited. Therefore, by using an edger reverse path leading end opening change pattern (solid line 32) that applies edger leading end opening changing control only at the tip portion, the plate width after rolling is made uniform (solid line 34). .

  By applying the edger reverse path leading end opening change pattern, the width drop caused by the width rolling in the reverse path is suppressed. However, an unsteady dogbone shape due to the spread of the material to be rolled 5 in the longitudinal direction still exists at the leading end.

  In width rolling in the forward pass following the reverse pass, consideration is given to the width return due to the dogbone shape formed by width rolling in the reverse pass and the unsteady dogbone shape formed at the tip end of the dogbone. There is a need to. Here, the unsteady dogbone shape formed at the leading end changes depending on the distribution of the width reduction amount between passes in which width rolling is performed continuously in the reverse pass and the forward pass. Therefore, in the present invention, the edger forward pass leading end opening change pattern is considered in consideration of the width reduction amount distribution ratio (reverse path distribution ratio) between the passes that are continuously subjected to width rolling in the reverse pass and the forward pass. to correct.

(Correction of edger positive path leading end opening change pattern)
When the reverse pass for performing the width rolling is set during the pass schedule, the pass schedule calculation unit 14 calculates the width reduction amount ratio (width reduction amount distribution ratio) of each pass using Equation 1.

In this example, the total number of paths is 7 (N = 7), ΔB _Ei is the width reduction amount in the i-th path (1 ≦ i ≦ N, i is a natural number) by the edger 2, and α _Ei is the width reduction distribution ratio in the i path. It is. α _Ei is predetermined as a target ratio. Σα _Ei = 1. The pass schedule calculation unit 14 calculates the width reduction amount ΔB _Ei of each pass based on the total width reduction amount from the first pass to the N pass and α _Ei . Note that N = 7 as an example, but N may be an odd number.

The reverse path distribution ratio calculation means 18 divides the width reduction amount of the i-1th path, which is the reverse path calculated by the path schedule calculation means 14, by the width reduction amount of the i-th path, which is the normal path, and reverse path distribution. Calculate the ratio. Specifically, the reverse path distribution ratio calculation unit 18 calculates the reverse path distribution ratio α _{rev_n} using Equation 2.

  The edger forward path leading end opening change pattern correcting unit 19 includes the reverse path distribution ratio calculated by the reverse path distribution ratio calculating unit 18 and the edger generated by the edger forward path leading end opening changing pattern generation unit 16a. Front pass leading end opening change pattern (hereinafter also referred to as reference leading end opening changing pattern), strip width before rolling in the reverse pass (target value), strip width after rolling in the forward pass (target value) ) Based on the position tracking information of the material 5 to be rolled, the reference leading end opening change pattern is corrected.

  FIG. 2 is a diagram for explaining the edger positive path leading end opening change pattern correction means 19. First, the reverse / normal path determination processing 191 determines whether or not the width rolling is continuously performed in the reverse path and the normal path based on the calculated value calculated by the path schedule calculation unit 14 and the position tracking information. .

The reverse / normal pass total width reduction amount calculation processing 192 is performed when the width rolling is continuously performed in the reverse pass and the normal pass, and the width (target value) before rolling in the reverse pass and the width in the normal pass. The total width reduction amount ΔB _Total when the width rolling is continuously performed in the reverse pass and the normal pass is calculated from the sheet width (target value) after the rolling using the following formula 3.

ここで、
Ｂ_ｉ−１：逆パスでの圧延前の板幅
Ｂ_Ｅｉ：正パスでの幅圧下後の板幅

here,
B _i-1 : Sheet width before rolling in reverse pass B _Ei : Sheet width after width reduction in _forward pass

Edger forward pass leading end opening change pattern correction ratio calculation processing 193 is performed by discriminating between the reverse pass and the forward pass, the total width reduction amount ΔB _Total, and the plate before reverse pass rolling calculated by the pass schedule calculation means 14. Using the reverse path distribution ratio α _{rev — n} calculated by the width and reverse path distribution ratio calculation means 18, the edger forward path leading end opening change pattern correction ratio is calculated. The edger forward pass leading end opening change pattern correction ratio γ _fwd is given by the following expression using the total width reduction amount ΔB _Total , the reverse pass distribution ratio α _{rev — n} , and the plate width B _i-1 before reverse pass rolling as variables. It is done.

ここで、
ｋ_１〜ｋ_４：係数

here,
k _{1 to} k ₄ : coefficients

The edger positive path leading edge opening change pattern correction amount calculation processing 194 multiplies the reference leading edge opening changing pattern by the edger positive path leading edge opening changing pattern correction ratio γ _fwd to obtain the edger positive path opening A tail end opening change pattern correction amount is calculated.

  Preferably, the edger positive path leading end opening change pattern correction amount is corrected with the learning value. The learning means 20 learns the deviation between the sheet width target value and the sheet width actual value at the leading end of the material to be rolled 5 based on the sheet width actual value and position tracking information measured by the sheet width meter 13. Calculate as The edger positive path leading end opening change pattern correcting means 19 corrects the edger positive path leading end opening changing pattern correction amount using the learning value so that the deviation becomes zero. Here, the learning value is preferably stored for each combination of the total width reduction amount of the reverse path and the forward path and the plate width target value (learning value table).

The edger positive path leading end opening change pattern correction amount ΔS _offset in which the learning value is reflected is expressed by Equation 7.

ここで、
ｘ：被圧延材の位置（例えば、被圧延材５を長手方向に分割した各位置）
ΔＳ_{ｏｆｆｓｅｔ}：エッジャ正パス先尾端開度変更パターン補正量
ΔＳ_{ｂａｓｉｃ}：基準先尾端開度変更パターン
Ｚ^Ａｃｔ：学習値

here,
x: Position of the material to be rolled (for example, each position where the material to be rolled 5 is divided in the longitudinal direction)
ΔS _offset : Edger positive path leading and trailing edge opening change pattern correction amount ΔS _basic : Reference leading and trailing edge opening changing pattern Z ^Act : Learning value

Further, for Z ^Act , the latest learning value Z ^Act _NEW is calculated by updating the past learning value Z ^Act _OLD using Equation 8.

ここで、
β：ゲイン
Ｂ^ＭＥＡＳ：板幅実績値
Ｂ^ＡＩＭ：板幅目標値

here,
β: Gain B ^MEAS : Actual plate width B ^AIM : Target plate width

  The calculated edger positive path leading end opening change pattern correction amount is added to the reference leading end opening changing pattern to correct the edger positive path leading end opening changing pattern. The corrected edger forward pass leading end opening change pattern after correction is a pattern suitable for horizontal rolling after width rolling continuously in the reverse pass and the forward pass. The corrected edger positive path leading end opening change pattern is output to the edger leading end opening control means 17. The edger leading end opening control means 17 sends a control signal to the HPC 4 for each position of the material to be rolled 5 so that the edger roll gap is changed according to the edger leading end opening changing pattern.

  FIG. 4 is a top view for explaining an example in which an edger forward pass leading end opening change pattern after correction is applied during width rolling in the forward pass next to the reverse pass. A broken line 41 indicates an edger positive path leading end opening change pattern before correction. The solid line 42 shows the edger positive path leading end opening change pattern after correction. A broken line 33 indicates the material to be rolled 5 that has been subjected to width rolling using a pattern in which the edger roll gap shown by the broken line 31 in FIG. 3 is constant. When width rolling using the pattern of the broken line 41 is performed on the material to be rolled 5 indicated by the broken line 33, the plate width of the leading end portion of the material to be rolled 5 becomes nonuniform as indicated by the broken line 43. On the other hand, in the present invention, first, width rolling using the edger reverse path leading end opening change pattern is performed in the reverse path (solid line 34). The rolled material 5 indicated by the solid line 34 is subjected to width rolling using a pattern that takes into account the reverse path distribution ratio indicated by the solid line 42. As a result, as shown by the solid line 44, the width dimension of the leading end of the material to be rolled 5 can be controlled with high accuracy.

By the way, in the system of Embodiment 1 described above, the learning value Z ^Act calculated by the learning means 20 in Expression 7 is added, but the learning value Z ^Act may be excluded. That is, a configuration without the learning unit 20 may be used.

  In this Embodiment, each part shown with the codes | symbols 12 and 14-20 shows the function which the leading end board width control apparatus 21 has. FIG. 5 is a diagram illustrating a hardware configuration of the leading end plate width control device 21. The leading edge plate width control device 21 includes a circuit including, for example, a processor 50 and a memory 51 as hardware resources. The leading end plate width control device 21 implements the functions of the units 12 and 14 to 20 by executing the program stored in the memory 51 by the processor 50. The leading end plate width control device 21 may include a plurality of processors 50. The leading end plate width control device 21 may include a plurality of memories 51. That is, a plurality of processors 50 and a plurality of memories 51 may cooperate to realize each function of each unit 12, 14 to 20. You may implement | achieve part or all of each function which each part 12, 14-20 has with hardware.

DESCRIPTION OF SYMBOLS 1 Reversible rolling mill 2 Edger 3 Horizontal mill 5 Rolled material 6 Conveying direction 7 Normal pass 8 Reverse pass 9 Roller table speed detector 10 Heat piece detector 11 Rotational speed detector 12 Tracking means 13 Plate width meter 14 Pass schedule calculation means 15 Hot-roll command information 16 Edger forward path leading end opening change pattern generating means 16a Edger forward path leading end opening changing pattern generating means 16b Edger reverse path leading end opening changing pattern generating means 17 Edger leading end opening pattern Degree control means 18 reverse path distribution ratio calculation means 19 edger forward path leading edge opening change pattern correction means 20 learning means 21 leading edge plate width controller 50 processor 51 memory 191 reverse / forward path discrimination process 192 reverse / forward path Total width reduction amount calculation processing 193 Edger positive path leading edge opening change pattern correction ratio calculation processing 194 Edger positive path leading edge End opening change pattern correction amount calculation processing

Claims (3)

A reversible comprising an edger having a pair of vertical rolls that perform width rolling on a material to be rolled on a rolling line, and a pair of horizontal rolls that are provided downstream of the vertical roll and perform horizontal rolling on the material to be rolled. A leading edge plate width control device for controlling a rolling mill,
The reversible rolling machine repeats a normal path for passing the material to be rolled from the upstream side to the downstream side of the reversible rolling machine and a reverse path for allowing the material to be rolled to pass from the downstream side to the upstream side, Perform both width rolling and horizontal rolling in each of the reverse passes,
The leading end plate width control device is:
Tracking means for tracking the position of the material to be rolled on the rolling line;
Based on hot rolling command information, path schedule calculation that calculates edger inlet side plate thickness, edger inlet side plate width, edger outlet side plate width, width reduction amount that is the difference between edger inlet side plate width and edger outlet side plate width in each pass Means,
Based on the calculated value calculated by the path schedule calculating means, the reverse path leading end outputs the edger reverse path leading end opening change pattern in the i-1th path (i is an odd number of 3 or more) which is the reverse path. End opening change pattern generation means;
Based on the calculated value calculated by the path schedule calculating means, a positive path leading end opening change pattern generating means for outputting an edger positive path leading end opening changing pattern in the i-th pass that is a positive path;
Reverse path distribution ratio calculating means for calculating a reverse path distribution ratio by dividing the width reduction amount of the i-1th path calculated by the path schedule calculation means by the width reduction amount of the i th path;
Based on the calculated value calculated by the path schedule calculating means, the reverse path distribution ratio, and the position tracking information of the material to be rolled calculated by the tracking means, the edger forward path leading end opening change pattern is calculated. Edger positive path leading end opening change pattern correcting means for correcting,
Based on the edger reverse path leading end opening change pattern, the corrected edger forward path leading end opening changing pattern, and the position tracking information, the pair of verticals at the leading end of the material to be rolled Edger leading end opening control means for outputting the roll gap of the roll, and
The edger changes the roll gap of the vertical roll based on the roll gap output from the edger leading end opening control means ,
The corrected edger positive path leading end opening change pattern is calculated based on the edger positive path leading end opening change pattern correction ratio,
The edger positive path leading and trailing edge opening change pattern correction ratio is expressed as γ _fwd , the width reduction amount of the i− 1th pass and the width reduction amount of the i th pass. the total value .DELTA.B _total, the reverse path distribution ratio _α rev_n, a rolled front plate width of the i-1 path _{B i-1,} the coefficients when the _k 1 to k _4, represented by the following equation A leading edge plate width control device.

The edger reverse pass leading end opening change pattern and the edger forward pass leading end opening changing pattern are such that the roll gap of the vertical roll at the leading end of the material to be rolled is other than the leading end. It is set wider than the roll gap in the stationary part,
The edger reverse pass leading end opening change pattern is set so that the plate width of the leading end portion of the material to be rolled after reverse pass rolling is not smaller than the plate width of the steady portion,
The leading end plate width control device according to claim 1. The tracking means acquires a sheet width actual value measured for each position of the material to be rolled by a sheet width meter provided on the downstream side of the reversible rolling mill,
The leading edge plate width control device is configured to adjust the edger positive path leading edge opening degree so that a deviation between a plate width actual value measured by the plate width meter and a plate width target value becomes zero. Further comprising learning means for correcting the change pattern;
The leading end plate width control apparatus according to claim 1 or 2 , characterized by the above-mentioned.

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