JP2005144588A - Rolled material dividing method and rolled material dividing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolled material dividing method and a device capable of accurately dividing a rolled material. <P>SOLUTION: This rolled material dividing method corrects the cutting timing on the basis of a difference Δa between a measured value and a specified cutting dimension, by measuring an actual dimension of a cut divided material 12 by a position sensor 15 and a feed distance sensor 16. This correction is made for changing a cutting dimension by a value of multiplying the difference Δa by a proportional constant. The cutting timing is corrected so as to be changed by Ks × Δa (Ks : an initial correction rate) in the initial stage of cutting work, and to be changed by Kg × Δa (Kg : a general correction rate) thereafter. Here, Kg < Ks < 1 is realized. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for dividing a rolled material formed by hot rolling, and a rolled material dividing apparatus for realizing the method.

  Conventionally, the method by hot rolling is widely known as a manufacturing method of bar steel (for example, refer to patent documents 1 and patent documents 2). In this manufacturing method, first, a raw material (billet) obtained through processes such as refining, ingot making, and ingot rolling is heated by a heating furnace. The billet is reduced in diameter and lengthened by hot rolling. A rolled material is thus obtained.

  The rolled material is divided into a predetermined length (a length several times that of the final product) by a flying shear while the rolling line is in progress. The rolled material after this division is also referred to as “divided material” in this specification. The temperature of the rolled material at the time of division (in other words, the temperature of the divided material immediately after the division) is a high temperature (for example, around 800 ° C.). The divided material is conveyed to the cooling bed, where it is air-cooled. The air-cooled divided material is conveyed to a cold shear by a roller table (also referred to as “run-out table”), and cut into a predetermined length to obtain a bar steel. The temperature of the divided material when cutting with a cold shear is, for example, around 200 ° C.

  Since the division by the flying shear is performed by cutting with a shearing force, the cut portion is deformed. Since this deformed portion is a defective portion, the deformed portion is cut off by a cold shear so as not to be mixed in the steel bar as the final product. In addition, when cutting with a cold shear, a surplus portion of the divided material is discarded. The shorter the length of this surplus portion, the higher the material yield. In other words, it is effective for improving the material yield that the divided material is accurately cut to a predetermined length, and therefore various methods for cutting steel bars have been proposed conventionally (for example, (See Patent Document 3).

JP-A-10-263602 JP 2000-42619 A JP-A 61-109611

  As an example, in the conventional steel bar cutting method, the weight of the surplus portion cut by the cold shear is measured, and if this is large, the cutting timing of the flying shear is corrected, thereby reducing the cut size of the split material. Is. That is, the data regarding the weight of the surplus portion is fed back to the cutting timing control of the flying shear, and the cutting dimension (the predetermined length) of the divided material is shortened.

  In this method, since the data fed back is the weight of the surplus portion, in order to correct the cutting timing of the flying shear and adjust the cutting size of the divided material, the cross-sectional area of the rolled material before cutting is accurately Need to be grasped. However, it is very difficult to accurately grasp the cross-sectional area of the rolled material before cutting, so it is difficult to achieve high-accuracy control of the cutting timing of the flying shear. It was not an effective means for.

  As another means, it may be possible to control the timing of cutting of the flying shear by using the length of the surplus portion as feedback data. However, it is difficult to accurately measure the length of the surplus portion. Hunting may occur in shear cutting timing control.

  Accordingly, an object of the present invention is to provide a rolling material dividing method and apparatus capable of accurately dividing a divided material into a predetermined length by performing stable cutting timing control of the flying shear.

  In order to achieve the above-mentioned object, the rolling material dividing method according to the present invention continuously cuts the rolling material fed along the feeding path with a flying shear by setting the division material set to the specified cutting dimension. A rolling material dividing method for producing the rolling material, which includes the following steps.

  (1) The tip position of the rolled material is detected by a plurality of position sensors arranged side by side along the feeding path, and the feeding distance of the rolled material is detected by a feeding distance sensor arranged in the feeding path. A first step of determining the cutting timing of the flying shear corresponding to the prescribed cutting dimension,

  (2) a second step of measuring the actual dimensions of the divided material at the time of cutting with a flying shear by the position sensor and the feeding distance sensor; and

  (3) a third step of correcting the cutting timing based on the difference (Δa) between the measured actual dimension and the prescribed cutting dimension, so as to bring the actual dimension of the divided material closer to the prescribed cutting dimension; In step 3, the difference (Δa) is fed back to the first step as feedback data, the cutting timing is corrected so that the specified cutting dimension is changed by Ks × Δa (Ks: initial correction rate), and then In addition, the cutting timing is set so as to be changed by Kg × Δa (Kg: general correction rate), and Kg <Ks <1 is set.

  According to this configuration, the rolled material fed along the feeding path is cut by the flying shear (specifically, when the cutting blade of the flying shear is driven to rotate), thereby dividing the divided material. Are generated continuously.

  At this time, the tip position of the rolled material continuously fed along the feeding path is grasped by the position sensor. Specifically, since a plurality of position sensors are arranged in parallel with the first position sensor, the second position sensor, and the nth position sensor in the feed path, the tip of the rolled material is detected by the nth position sensor. Thus, it is understood that the rolled material has been fed at least from the reference position (flying shear position) of the feed path by a length corresponding to the position of the position sensor. Moreover, the feed distance on the feed path of the rolled material is detected by a feed distance sensor separately from the position sensor. At this time, the feed distance sensor detects the length of the rolled material fed from the reference position (flying shear position) of the feed path, but at the same time as the detection by the position sensors. Preferably, the sensor is set to be reset. As a result, the feed distance sensor alone has to reduce the accuracy of detecting the feed distance of the rolled material, but by combining with the position detection of the tip of the rolled material by the position sensor, the feed distance of the rolled material can be reduced. Detection accuracy is improved. Then, when the feed distance of the rolled material becomes a value corresponding to the specified cutting dimension (cutting timing), the cutting blade is driven (first step).

  Next, since the cutting of the rolled material is completed when the cutting blade of the flying shear reaches the bottom dead center, the actual size of the divided material at the time (that is, when cut by the flying shear) is measured. (Second step). Specifically, from the leading edge position of the rolled material detected by the position sensor when the cutting blade reaches bottom dead center and the feeding distance detected by the feeding distance sensor, the actual length of the divided material is determined. Is measured.

  Thereby, the difference (Δa) between the measured actual dimension and the specified cut dimension is grasped, but the difference (Δa) is nothing but the manufacturing error of the divided material with respect to the specified cut dimension. Accordingly, the cutting timing by the cutting blade is corrected so that the difference (Δa) is reduced (third step). For example, when the difference (Δa) is a large value, the cutting timing is advanced, and as a result, the actual length of the divided material approaches the specified cutting dimension.

  Specifically, the difference (Δa) is fed back to the first step as feedback data, and the cutting timing is corrected so that the specified cutting dimension is changed by Ks × Δa (Ks: initial correction rate). (Third step). Since the generation of the divided material is an operation performed continuously, this correction is made every time the rolled material is cut. In the initial stage of the cutting operation of the rolled material, the initial correction rate Ks is a value smaller than 1, preferably 0.3 or more and less than 1.0, more preferably 0.45 or more and 0.55 or less. .

  After the initial cutting operation, the difference (Δa) is fed back to the first step as feedback data, and the cutting timing is set so that the specified cutting dimension is changed by Kg × Δa (Kg: general correction rate). It is corrected. In the cutting operation after the initial stage, the general correction rate Kg is a value smaller than 1, and is preferably set to 0.05 or more and 0.8 or less, more preferably 0.08 or more and 0.15 or less.

  As described above, the correction of the cutting timing in the first step is different in the correction rate between the initial stage of the cutting operation of the rolled material and thereafter, and is corrected at a large ratio at the initial stage, and corrected at a small ratio thereafter. . Moreover, since the correction rates Kg and Ks are set to the above values, the cutting timing correction control can be quickly and stably corrected without causing a hunting phenomenon.

  Moreover, since the said objective is achieved, the rolling material division | segmentation apparatus which concerns on this invention is arrange | positioned at the feeding part which feeds a rolling material along a feeding path, and a feeding path, and is based on a predetermined drive signal. The cutting blade is driven to rotate and the rolling material is cut into a predetermined specified cutting size to generate a divided material, and a plurality of rolling materials are arranged in parallel along the feeding path and fed. A position sensor that detects the position of the tip and outputs a position signal, a feed distance sensor that is disposed in the feed path and detects the feed distance of the rolled material and outputs a feed distance signal, and cutting of the flying shear A cutting blade attitude sensor that detects the attitude of the blade that cuts the rolled material and outputs a cutting attitude signal, a cutting timing control unit that outputs the drive signal based on the position signal and the feed distance signal, and the cutting attitude The above position when the signal is output The actual dimension measuring unit for measuring the actual dimension of the divided material at the time of cutting based on the signal and the feed distance signal, and the actual dimension of the divided material based on the difference (Δa) between the measured actual dimension and the specified cut dimension And a correction control unit that outputs a correction signal for correcting the output timing of the drive signal to the cutting timing control unit so as to be close to the specified cutting size, and the correction control unit is Ks × Δa (Ks: initial correction rate) ) Is set to output a general correction signal corresponding to Kg × Δa (Kg: general correction rate), and Kg <Ks <1. It is characterized by.

  According to this configuration, the rolled material fed along the feeding path is cut by the flying shear (specifically, when the cutting blade of the flying shear is driven to rotate), thereby dividing the divided material. Are generated continuously.

  Specifically, the rolled material is fed along the feeding path by the feeding unit, but the tip of the rolled material is detected by a position sensor. This position sensor outputs a position signal when the tip of the rolled material is detected. Since a plurality of position sensors are arranged in parallel along the feed path, each of the position sensors detects the tip of the rolled material in order, so that the rolled material is at least the reference position of the feed path (the position of the flying shear). ), It is understood that the sheet is fed by a length corresponding to the position of the position sensor.

  In addition, the feed distance on the feed path of the rolled material is detected by a feed distance sensor. At this time, the feeding distance sensor detects the length of the rolled material fed from the reference position (the position of the flying shear) of the feeding path, but the position signal output from each position sensor described above is used. It is preferable that the feeding distance sensor is set to be reset on the basis thereof. As a result, the feed distance sensor alone has to reduce the accuracy of detecting the feed distance of the rolled material, but by combining with the position detection of the tip of the rolled material by the position sensor, the feed distance of the rolled material can be reduced. Detection accuracy is improved. Then, when the feeding distance of the rolled material becomes a value corresponding to the specified cutting dimension (cutting timing), the feeding distance signal outputs the feeding distance signal.

  The cutting timing control unit outputs a driving signal based on the position signal and the feeding distance signal. The flying shear is actuated based on this drive signal, and the rolled material is cut. At this time, the posture when the cutting blade reaches the bottom dead center is detected by the cutting blade posture sensor, and a cutting posture signal is output. That is, the moment when the cutting posture signal is output means the moment when the cutting blade cuts the rolled material. The rolled material feeding distance when the rolled material is cut becomes the actual dimension of the divided material. This actual dimension is measured by the actual dimension measuring unit based on the position signal and the feeding distance signal. The

  The correction control unit compares the measured actual dimension with the specified cutting dimension, determines a difference (Δa) between them, and outputs a correction signal to reduce the difference (Δa). The cutting timing control unit receives this correction signal and adjusts the cutting timing of the rolled material. That is, the difference (Δa) is fed back to the cutting timing control unit. For example, when the difference (Δa) is a large value, the cutting timing is advanced, and as a result, the actual length of the divided material approaches the specified cutting dimension.

  Specifically, a correction signal based on the difference (Δa) is fed back to the cutting timing control unit as feedback data, and the cutting timing is changed so that the specified cutting dimension is changed by Ks × Δa (Ks: initial correction rate). Is corrected. Since the generation of the divided material is an operation performed continuously, this correction is made every time the rolled material is cut. In the initial stage of the cutting operation of the rolled material, the initial correction rate Ks is a value smaller than 1, preferably 0.3 or more and less than 1.0, more preferably 0.45 or more and 0.55 or less. .

  After the initial cutting operation, a correction signal based on the difference (Δa) is fed back to the cutting timing control unit as feedback data so that the specified cutting dimension is changed by Kg × Δa (Kg: general correction rate). The cutting timing is corrected. In the cutting operation after the initial stage, the general correction rate Kg is a value smaller than 1, and is preferably set to 0.05 or more and 0.8 or less, more preferably 0.08 or more and 0.15 or less.

  As described above, the correction of the cutting timing is different in the correction rate between the initial stage of the cutting operation of the rolled material and thereafter, and is corrected at a large ratio at the initial stage and is corrected at a small ratio thereafter. Moreover, since the correction rates Kg and Ks are set to the above values, the cutting timing correction control can be quickly and stably corrected without causing a hunting phenomenon.

  As described above, according to the present invention, the specified cut size of the rolled material is corrected based on the difference from the actual size of the divided material, so that the actual size of the divided material accurately matches the dimension designed in advance. It will be. In addition, in order to adjust the actual dimensions of the divided material, the correction amount is changed at the initial stage of the cutting operation and thereafter, the correction amount is greatly corrected at the initial stage, and fine adjustment is performed thereafter, so that the control is stable. As a result, the divided material is cut to a specified cutting dimension with extremely high accuracy.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

FIG. 1 is a diagram schematically showing a rolled material dividing apparatus 10 according to an embodiment of the present invention.
The rolled material dividing device 10 is used to cut and divide a hot-rolled long bar-like member (hereinafter simply referred to as “rolled material”) 11 into a predetermined dimension (specified cutting dimension). Thus, the divided material 12 set to the prescribed cutting dimension is continuously generated.

  The rolling material dividing device 10 includes a feeding path 13 through which the rolling material 11 is fed and conveyed, a flying shear 14 disposed on the feeding path 13, and a plurality of locations along the feeding path 13 (5 in the figure). A position sensor 15 (15a to 15e) and a feeding distance sensor 16 arranged at a location), and a control device 17 described in detail later. The control device 17 controls the driving of the flying shear 14 so that the rolled material 11 is accurately cut according to the specified cutting dimensions.

  The feed path 13 is composed of a known transport device. This conveying device supports the rolled material 11 and guides the rolled material 11 along a predetermined path. The flying shear 14 is also a known structure, and includes a pair of rotating cutting blades 18. When the flying shear is driven, the rolled material 11 is cut by the cutting blade 18. The cutting blades 18 are usually arranged so as to be separated from each other as shown in the figure, and are brought close to each other by being rotated at a predetermined timing, whereby the rolled material 11 is sandwiched.

  Here, the position of the cutting blade 18 shown in the figure is defined as the top dead center posture, and the position where the cutting blade 18 is rotated to cut the rolled material 11 is defined as the bottom dead center posture. Furthermore, in this embodiment, a cutting blade posture sensor 19 that detects the posture of the cutting blade 18 is provided. The cutting blade posture sensor 19 detects the bottom dead center posture of the cutting blade 18 (that is, the posture when the rolled material 11 is cut). When the cutting blade posture sensor 19 detects the bottom dead center posture, a cutting posture signal S1 is output.

  The position sensor 15 detects the tip position of the rolled material 11 to be fed. When the tip of the rolling material 11 fed along the feed path 13 passes through each position sensor 15, each position sensor 15 outputs position signals S2 to S6. Each of these position signals S2 to S6 means that the tip of the rolled material 11 is present at the position where the position sensor 15 is arranged from the reference position (in this embodiment, the cutting position of the rolled material 11 by the flying shear 14). To do. In other words, it means that the rolled material 11 has been fed from the cutting position to the position of the position sensor 15. If the rolled material 11 is cut at this time, the position sensor 15 from the cutting position. Thus, the divided material 12 having a cutting size corresponding to the distance to the position is obtained.

  The feeding distance sensor 16 detects the feeding distance of the rolled material 11 to be fed. The feeding distance sensor 16 always measures the feeding distance of the rolled material 11 and outputs a feeding distance signal S7. However, as will be described later, when the rolled material 11 to be fed passes through each of the position sensors 15, the measured value of the feeding distance by the feeding distance sensor 16 is reset (S7 = 0). Thus, an accurate feeding distance of the rolled material 11 is measured.

  Specifically, for example, assuming that the distance from the cutting position to the position sensor 15c is A, and when the divided material 12 having the dimension (A + m) is generated, the entire dimension (A + m) is the feeding distance sensor. If only 16 is measured, the measurement error increases. However, since the position of each position sensor 15 is accurately set in advance, when the position sensor 15c outputs the position signal S4, the rolled material 11 is exactly at the position A from the cutting position. Therefore, rather than measuring all dimensions (A + m) by the feed distance sensor, the feed distance sensor 16 is reset once when each position sensor 15 detects the leading edge of the rolled material 11, thereby feeding distance. The sensor 16 can measure the rolled material 11 accurately by measuring only the remaining dimension m.

FIG. 2 is a diagram schematically illustrating the configuration of the control device 17.
As shown in the figure, the control device 17 is stored in advance in the specified value storage unit 20, the position storage unit 21, the posture storage unit 22, the distance storage unit 23, the program storage unit 24, and the program storage unit 24. A CPU 25 that reads the computer program and performs calculations based on the data stored in the storage units 20 to 23, and an output unit 26 that outputs a command from the CPU 25.

  The specified value storage unit 20 stores the specified cutting dimension, the number of specified corrections described later, and the like. These specified cutting dimensions and the like are input from, for example, a predetermined input device 27 (keyboard or the like). The position storage unit 21 receives the position signals S2 to S6 from the position sensor 15 and stores them as position data. The posture storage unit 22 receives the cutting posture signal S1 from the cutting blade posture sensor 19 and stores it as cutting posture data. The distance storage unit 23 receives the feeding distance signal S7 from the feeding distance sensor 16 and stores it as feeding distance data.

  The program storage unit 24 stores in advance a cutting program 28 (cutting timing control unit), an actual size measurement program 29 (actual size measurement unit), and a correction program 30 (correction control unit). The cutting program 28 determines the cutting timing of the rolled material 11 by the flying shear 14. The actual size measurement program 29 measures the actual size of the divided material 12. The correction program 30 compares the actual dimensions of the divided material 12 with the specified cutting dimensions stored in the specified value storage unit 20, and adjusts the cutting timing based on the difference (Δa) between the two dimensions. Specifically, correction data (correction signal) for adjusting the cutting timing is created by the correction program 30, and this is fed back to the execution of the cutting program 28.

  The CPU 25 executes the programs 28 to 30 and outputs the drive signal S8 to the flying shear 14 via the output unit 26. When the correction data created by the correction program 30 is fed back, the output timing of the drive signal S8 is corrected. Therefore, the driving of the flying shear 14 is controlled based on the drive signal S8 so that the dimensional difference (Δa) is reduced.

  The correction program is executed each time the rolled material 11 is cut and the divided material 12 is generated. At this time, if the correction program 30 is configured so that the difference (Δa) is zero, hunting may occur in the cutting timing control of the flying shear 14. Therefore, the correction program 30 is configured so that a value obtained by multiplying the difference (Δa) by a coefficient K (0 <K <1) is set to zero. Specifically, among the cutting operations of the rolled material 11 that are repeatedly and continuously performed, the first 3 to 10 times (the specified correction number) is a value obtained by multiplying the difference (Δa) by the initial correction rate Ks, and thereafter. The correction program 30 is configured so that the value obtained by multiplying the difference (Δa) by the general correction rate Kg is zero. In this case, there is a relationship of Kg <Ks between the initial correction rate Ks and the general correction rate Kg.

  In the present embodiment, the initial correction rate Ks is set to Ks = 0.5, and the general correction rate Kg is set to Kg = 0.1. However, the initial correction rate Ks is set in the range of 0.3 ≦ Ks <1.0, preferably in the range of 0.4 ≦ Ks ≦ 0.8, and more preferably in the range of 0.45 ≦ Ks ≦ 0.55. The general correction rate Kg is in the range of 0.05 ≦ Kg ≦ 0.8, preferably in the range of 0.05 ≦ Kg ≦ 0.3, more preferably in the range of 0.08 ≦ Kg ≦ 0.15. Can be set in range.

FIG. 3 is a flowchart showing a method for dividing the rolled material 11 by the rolled material dividing apparatus 10.
First, the specified cutting dimension, the specified number of corrections, and the like are input in advance by the input device, and the rolled material 11 is fed along the feeding path. Here, the specified number of corrections is the same as the number of cuts of the rolled material.

  When the rolled material 11 is fed, the position sensor 15 detects the tip position of the rolled material 11 (STEP 1: first step), and the feeding distance sensor 16 detects the feeding distance of the rolled material 11. (STEP2: 1st step). Further, the posture of the cutting blade 18 is detected by the cutting blade posture sensor 19 (STEP 3). Usually, the posture of the cutting blade 18 at this time is set to the top dead center posture.

  By executing the cutting program 28, it is determined whether or not the feeding distance of the rolled material 11 at this time corresponds to the specified cutting dimension (STEP 4: first step). If it corresponds, the drive signal S8 is determined. Based on the above, the flying shear 14 is driven and the rolled material 11 is cut (STEP 5: first step). Further, when the feeding distance of the rolled material 11 does not correspond to the specified cutting dimension, the detection is continued by the position sensor 15 and the feeding distance sensor 16 again.

  The posture of the cutting blade 18 when the flying shear 14 is driven and the rolled material 11 is cut is detected by the cutting blade posture sensor 19, and the cutting posture signal S1 is output. Here, the distance at which the rolled material 11 is fed from the time when the actual size measurement program 29 is executed and the driving signal S8 is output until the cutting posture signal S1 is output is the feeding distance sensor 16. As a result, the feeding distance of the rolled material 11 at the time when the cutting posture signal S1 is output is measured by the position sensor 15 and the feeding distance sensor 16 (STEP 6: second step). . This detected distance corresponds to the actual length (actual dimension) of the cut divided material 12.

  Next, the correction program 30 is executed, the actual dimension of the divided material 12 is compared with the prescribed cut dimension, and the difference between them (that is, the dimension difference Δa) is calculated (STEP 7: third step). Since this difference Δa represents a manufacturing error of the divided material 12 with respect to a preset specified cutting dimension, the cutting timing of the rolled material 11 (that is, the output timing of the drive signal S8) is based on this difference Δa. It is corrected (STEP 8: third step). Specifically, when the difference Δa takes a positive value (when the actual dimension is larger than the prescribed cutting dimension), the output timing of the drive signal S8 is advanced correspondingly, and the difference Δa is negative. When the value is taken (when the actual dimension is smaller than the prescribed cutting dimension), the output timing of the drive signal S8 is delayed correspondingly. On the other hand, if the difference Δa is zero, the divided material 12 has been cut according to a preset specified cutting dimension.

  After such timing correction, if the cutting work of the rolled material 11 is continued, the cutting work is continued. Otherwise, the cutting work is ended (STEP 9).

  As described above, the difference (Δa) between the measured actual dimension of the divided material 12 and the specified cutting dimension is reduced by employing the rolled material dividing method by the rolled material dividing apparatus 10 according to the present embodiment. Since the cutting timing by the cutting blade 18 is corrected, the cutting operation by the flying shear 14 is repeated, and as a result, the actual dimension of the divided member 12 approaches the specified cutting dimension. Further, as described above, the correction of the cutting timing is different in the correction rate between the initial stage and the subsequent period of the cutting work of the rolled material 11, and is corrected at a large ratio at the initial stage, and is corrected at a small ratio after that. As for cutting timing correction control, quick and stable control is realized without causing a hunting phenomenon.

  The present invention can be applied to an apparatus and a method employed for cutting a rolled material.

FIG. 1 is a diagram schematically showing a rolled material dividing apparatus according to an embodiment of the present invention. FIG. 2 is a diagram schematically illustrating a configuration of a control device included in the rolled material dividing device according to the embodiment of the present invention. FIG. 3 is a flowchart showing a rolled material dividing method by the rolled material dividing apparatus according to the embodiment of the present invention.

Explanation of symbols

S1 ... Cutting posture signal S2 to S6 ... Position signal S7 ... Feeding distance signal S8 ... Drive signal 10 ... Rolled material dividing device 11 ... Rolled material 12 ... Divided material 13 ... Feeding path 14 ... Flying shear 15 ... Position sensor 16 ... Feeding distance sensor 17 ... Control device 18 ... Cutting blade 19 ... Cutting blade attitude sensor 20 ... Specified value storage unit 21 ... Position storage unit 22 ... Posture storage unit 23 ... Distance storage unit 24 ... Program storage unit 25 ... CPU
26... Output unit 27... Input device 28... Cutting program 29.

Claims (4)

A rolling material dividing method for continuously generating a divided material set to a specified cutting dimension by cutting a rolled material fed along a feeding path with a flying shear,
By detecting the tip position of the rolling material with a plurality of position sensors arranged in parallel along the feeding path and detecting the feeding distance of the rolling material with a feeding distance sensor arranged in the feeding path, A first step of determining the cutting timing of the flying shear corresponding to the prescribed cutting dimension;
A second step of measuring the actual dimensions of the divided material at the time of cutting with a flying shear by the position sensor and the feeding distance sensor;
A third step of correcting the cutting timing to bring the actual dimension of the divided material closer to the prescribed cutting dimension based on the difference (Δa) between the measured actual dimension and the prescribed cutting dimension;
In the third step, the difference (Δa) is fed back to the first step as feedback data, and the cutting timing is corrected so that the specified cutting dimension is changed by Ks × Δa (Ks: initial correction rate). Thereafter, the rolling material dividing method is set so as to correct the cutting timing such that Kg × Δa (Kg: general correction rate) is changed, and Kg <Ks <1. The initial correction rate Ks is set to 0.3 ≦ Ks <1.0,
The rolled material dividing method according to claim 1, wherein the general correction rate Kg is set to 0.05 ≦ Kg ≦ 0.8. A feeding section for feeding the rolled material along the feeding path;
A flying shear that is arranged in the feeding path and generates a divided material by cutting the rolled material into a predetermined specified cutting dimension by rotating the cutting blade based on a predetermined drive signal,
A position sensor that is arranged in parallel along the feeding path and detects the tip position of the fed rolled material and outputs a position signal;
A feed distance sensor which is arranged in the feed path and detects the feed distance of the rolled material and outputs a feed distance signal;
A cutting blade attitude sensor that detects the attitude of the flying shear cutting blade cutting the rolled material and outputs a cutting attitude signal;
A cutting timing control unit for outputting the driving signal based on the position signal and the feeding distance signal;
An actual dimension measuring unit that measures an actual dimension of the divided material at the time of cutting based on the position signal and the feeding distance signal at the time when the cutting posture signal is output;
Based on the difference (Δa) between the measured actual dimension and the specified cutting dimension, a correction signal for correcting the output timing of the drive signal is supplied to the cutting timing control unit so as to bring the actual dimension of the divided material closer to the specified cutting dimension. A correction control unit for outputting,
The correction control unit is set to output a general correction signal corresponding to Kg × Δa (Kg: general correction rate) after outputting an initial correction signal corresponding to Ks × Δa (Ks: initial correction rate). And a rolling material dividing apparatus in which Kg <Ks <1. The initial correction rate Ks is set to 0.3 ≦ Ks <1.0,
The rolling material dividing apparatus according to claim 3, wherein the general correction rate Kg is set to 0.05 ≦ Kg ≦ 0.8.

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