WO2018216090A1

WO2018216090A1 - Dividing cut control device

Info

Publication number: WO2018216090A1
Application number: PCT/JP2017/019141
Authority: WO
Inventors: 稔橘
Original assignee: 東芝三菱電機産業システム株式会社
Priority date: 2017-05-23
Filing date: 2017-05-23
Publication date: 2018-11-29
Also published as: TWI654043B; TW201900308A

Abstract

In an embodiment, a dividing cut control device is provided that is capable of calculating the length of remaining material even when the distance between the last stand of a rolling machine and flying shears is short compared to the product length after the dividing cut. The dividing cut control device is provided with a calculation unit. Said calculation unit detects the position of the leading edge of a metal material undergoing the dividing cut, calculates the position of the final dividing cut from said leading edge, and calculates the length of the remaining material from the position of the final dividing cut to the tail edge.

Description

Split cut control device

The embodiment of the present invention relates to a split cut control device used for equipment in which the distance between the final stand of the rolling mill and the flying shear provided downstream of the rolling mill is shorter than the product length after the split cut.

Split used in a rolling process, provided on the exit side of the rolling mill, including a length measuring roll with a pulse transmitter attached thereto, a flying shear that splits and cuts the rolled material, and a material detector that detects the passage of the rolled material. A cut control device is known (for example, Patent Document 1). In such a divided cut control device, the flying shear is activated so that the material tip distance calculated by the data output from the material detector and the pulse transmitter is the same as the cutting length specified by the computer. The material is cut in pieces.

¡If you continue to perform split cutting with the specified product cutting length due to material weight variations or computer calculation errors, error wrinkles will concentrate on the final split material. If the length of the final divided material is not appropriate, there may be a problem that the final divided material cannot be conveyed in downstream equipment.

In Patent Document 1, the tail end length is calculated by a length measuring roll provided on the exit side of the rolling mill. Then, based on the calculated tail end length, the length of the remaining material of the final divided material is obtained, and the divided length is corrected so that the length of the divided cut falls within the allowable range. As described above, by making the length of the rolled material including the final divided material within a preset allowable range, the divided cut control device of Patent Document 1 is caused by the downstream equipment conditions and the like after the rolling mill. Prevent getting trouble.

JP 63-260720 A

In the method described above, the distance between the final stand and the flying shear needs to be sufficiently long. When this distance is sufficiently long, after the tail end of the material has passed through the final stand, the tail end tracking can be measured using a length measuring roll provided on the exit side of the final stand. However, in equipment with a short distance between the final stand and the flying shear, when the material is divided and cut, the tail end of the material is being rolled and tail end tracking cannot be performed, so the length of the remaining material cannot be calculated. .

In the present embodiment, even when the distance between the final stand of the rolling mill and the flying shear is short compared to the product length after the division cut, the division cut control that can calculate the length of the remaining material An object is to provide an apparatus.

According to the embodiment of the present invention, there is provided a split cut control device that splits and cuts a rolled metal material with a flying shear and supplies it to the next process. This divided cut control device detects the position of the tip of the divided metal material, calculates the final divided cut position from the tip, and calculates the remaining material length from the final divided cut position to the tail end An arithmetic unit is provided.

According to the divided cut control device of the embodiment, the calculation unit detects the position of the tip of the metal material that has been divided and cut, calculates the final divided cut position from the tip, and from the final divided cut position to the tail end. Since the remaining material length is calculated, the length of the remaining material can be calculated even when the distance between the final stand of the rolling mill and the flying shear is shorter than the product length after split cutting. it can.

It is a block diagram which illustrates the division | segmentation cut control apparatus which concerns on embodiment. It is a schematic diagram of the steel plate for demonstrating operation | movement of the division | segmentation cut control apparatus of embodiment. It is an example of the flowchart for demonstrating operation | movement of the division | segmentation cut control apparatus of embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
The drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the size ratio between the parts, and the like are not necessarily the same as actual ones. Further, even when the same part is represented, the dimensions and ratios may be represented differently depending on the drawings.
Note that, in the present specification and each drawing, the same elements as those described above with reference to the previous drawings are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate.

FIG. 1 is a block diagram illustrating a split cut control device according to this embodiment.
FIG. 1 schematically shows a configuration example of a rolling plant 100 in which the divided cut control device 10 operates. The rolling plant 100 includes one or more rolling stands, and FIG. 1 shows a final stand 20 among a plurality of rolling stands. The steel material including the preceding material 1a and the current material 1b rolled by the final stand 20 is conveyed on the conveying roller in the direction of the arrow in the drawing and sent to a downstream process. The rolling plant may be hot rolling or cold rolling. Moreover, the metal material to be rolled is not limited to steel, but may be other metal materials such as copper and aluminum.

A flying shear 24 is installed on the exit side of the final stand 20. The flying shear 24 divides and cuts the steel material sent from the final stand 20. The preceding material 1a divided and cut in advance is conveyed to a downstream process. The current material 1b divided and cut from the preceding material 1a is conveyed following the preceding material 1a. In this case, the rolling operation is continued at least by the final stand 20 at the rear end portion including the tail end of the current material 1b.

The flying shear 24 generates an initialization signal ts when the current material 1b is divided and cut from the preceding material 1a. The initialization signal ts is supplied to the divided cut control device 10.

The rolling stand is provided with a load cell for monitoring the rolling load. The load cell 21 is also provided in the final stand 20, and when the value of the load cell 21 changes to a small value, it can be detected that the tail end of the current material 1 b has left the final stand 20. Based on the output of the load cell 21, a tail end missing signal tt indicating that the tail end of the current material 1b has been removed is generated. The tail end missing signal tt is supplied to the divided cut control device 10.

Whether or not the current material 1b in which the tail end has been detected is to be subjected to a division cut of the product length is determined by the division cut control device 10 as a final material.

Other means may be used in place of the load cell 21 as long as it can be detected that the tail end of the current material 1b has come off. For example, the tail end omission signal tt may be generated by monitoring the output current of the electric motor drive device that drives the final stand 20.

A length measuring roll 22 is provided between the final stand 20 and the flying shear 24. The length measuring roll 22 conveys steel materials (including the preceding material 1a and the current material 1b) placed on the upper part together with other conveying rolls (not shown).

The length measuring roll 22 includes, for example, a rotary encoder. The length measuring roll 22 can output data of a rotation speed (= number of rotations per unit time) ns. The rotation speed ns data output from the length measuring roll 22 is supplied to the division cut control device 10 and used to calculate the moving distance of the current material 1b. The data of the rotational speed ns is output as the number of pulses per unit time output by the rotary encoder, for example. By counting the radius of the length measuring roll 22 and the number of outputted pulses, the moving distance of the current material 1b can be calculated.

A hot metal detector (HMD) 30 is provided between the final stand 20 and the flying shear 24. In this example, the HMD 30 is provided between the length measuring roll 22 and the flying shear 24. The steel material rolled by the rolling stand including the final stand 20 is heated to a high temperature. The HMD 30 can detect that the tail end of the steel material has passed by detecting the temperature of the steel material sent from the final stand 20. When the HMD 30 detects the passage of the tail end, the tail end passage signal tr is supplied to the divided cut control device 10.

As long as it can be detected that the tail end of the current material 1b has come off from the final stand 20, other means may be used instead of the HMD. For example, a tail end passage signal tr may be generated by detecting passage of the tail end of the current material 1b using an optical sensor or the like.

A measuring roll 32 is provided on the exit side of the flying shear 24. The length measuring roll 32 has a built-in rotary encoder, as with the length measuring roll 22 on the input side, and outputs data on the rotational speed nr. As with the rotation speed ns data of the length measuring roll 22, the rotation speed nr data is calculated by, for example, counting the number of pulses to calculate the position of the tail edge or the position of the crop cut based on the position of the tail edge. be able to. Data on the rotational speed nr output from the length measuring roll 32 is supplied to the divided cut control device 10.

The configuration of the split cut control device 10 will be described. The divided cut control device 10 includes a calculation unit 10 a including a tip tracking unit 11, a remaining material length calculation unit 14, and a remaining material length determination unit 15. The calculation unit 10 a of the divided cut control device 10 further includes a tail end tracking unit 16.

The division cut control device 10 receives the initialization signal ts. The initialization signal ts is generated when the current material 1b is divided and cut from the preceding material 1a. The division cut control device 10 inputs data on the rotational speed ns. Data on the rotational speed ns is supplied from the length measuring roll 22. The data of the rotational speed ns is integrated until the tail end missing signal tt is detected by monitoring the output of the load cell 21.

The split cut control device 10 calculates the tip distance Ht based on the initialization signal ts, the rotation speed ns, and the tail end missing signal tt. The tip distance Ht is the length from the tip T of the steel material to the position where it is divided and cut by the flying shear 24.

The division cut control device 10 calculates the remaining material length Lr when the current material 1b is divided and cut based on the calculated tip distance Ht. When the calculated remaining material length Lr is less than the preset length, the division cut control device 10 performs a crop cut at the tail end. When the calculated remaining material length Lr is equal to or longer than the preset length, the divided cut control device 10 further performs divided cut. The preset length is set based on, for example, the minimum length necessary for the remaining material to be transported on the transport roll.

The tip tracking unit 11 is connected to the flying shear 24. The flying shear 24 outputs an initialization signal ts when the current material 1b is divided and cut from the preceding material 1a. The tip tracking unit 11 receives the initialization signal ts and initializes the position of the tip T of the current material 1b.

The tip tracking unit 11 is supplied with an initialization signal ts, rotation speed ns data, and tail end missing signal tt. The tip tracking unit 11 accumulates data on the rotational speed ns from the initialization signal ts until the tail end missing signal tt is input. The tip tracking unit 11 calculates the tip distance Ht based on the accumulated rotation speed ns and the radius of the length measuring roll 22.

The tip tracking unit 11 determines whether to perform a normal divided cut or a final material cut depending on the presence or absence of the tail end missing signal tt. When the tail end missing signal tt is not received, the tip tracking unit 11 generates a cutting signal C0 for performing a normal divided cut, and supplies the cutting signal C0 to the flying shear driving unit 17. The flying shear drive unit 17 supplies the drive signal CC to the flying shear 24 based on the cutting signal C0. The flying shear 24 divides and cuts the current material 1b from the preceding material 1a based on the drive signal CC.

When the tail end missing signal tt is received, the tip tracking unit 11 outputs the tip distance Ht data in order to determine whether or not to cut the final material. The data of the tip distance Ht is supplied to one input of the adder 13. The output of the first distance setting unit 12 is supplied to the other input of the adder 13. The first distance setting unit 12 stores data of the first distance L1 between the final stand 20 and the flying shear 24. The adder 13 adds and outputs the data of the tip distance Ht and the data of the first distance L1.

The remaining material length calculation unit 14 is connected to the output of the adder 13. The remaining material length calculation unit 14 calculates the remaining material length Lr when the current material 1b is divided and cut by the set product length L.

The remaining material length determination unit 15 is connected to the output of the remaining material length calculation unit 14. The remaining material length determination unit 15 compares the remaining material length Lr calculated by the remaining material length calculation unit 14 with a preset allowable remaining material length Lmin. When the calculated remaining material length Lr is equal to or greater than the allowable remaining material length Lmin, the remaining material length determination unit 15 sends a cutting signal to the flying shear drive unit 17 in order to cut at the product length L. Supply C1. The flying shear driving unit 17 supplies the driving signal CC to the flying shear 24 based on the cutting signal C1. The flying shear 24 cuts the current material 1b based on the drive signal CC.

The other output of the remaining material length determination unit 15 is connected to the tail end tracking unit 16. The output of the tail end tracking unit 16 is connected to the flying shear drive unit 17. When the remaining material length Lr is shorter than the allowable remaining material length Lmin, the remaining material length determination unit 15 does not generate the cutting signal C1 and the signal C2 for performing the crop cutting to the tail end tracking unit 16 Supply.

FIG. 2 is a schematic view of a steel plate for explaining the operation of the split cut control device of the present embodiment. The upper part of FIG. 2 shows an example of the current material 1c when the remaining material length is shorter than the allowable remaining material length. The lower part of FIG. 2 shows an example of the current material 1d when the remaining material length is longer than or equal to the allowable remaining material length. In FIG. 2, the X axis is taken as the coordinate axis. It is assumed that the final stand 20 is disposed at the origin O on the X axis. A flying shear 24 is provided in the positive direction of the X axis, and its coordinates are L1. L1 is the first distance defined above.

As shown in FIG. 2, the remaining material length Lr of the

current materials

1c and 1d is calculated based on the tip distance Ht, the first distance L1, and the product length L after being divided and cut. Specifically, the remaining material length Lr is obtained by the following equation (1).

Lr = Ht + L1-L (1)

As shown in the upper diagram of FIG. 2, in the case of the current material 1c, the coordinate of the tip T is X1, and the total length is X1 = Ht + L1. When the product length L is subtracted from X1, the remaining material length Lr is shorter than the allowable remaining material length Lmin. In this case, if the product is further divided and cut at the product length L, the remaining material is shorter than the allowable remaining material length Lmin.

2, in the case of the current material 1d, the coordinate of the tip T is X2 (> X1), and the total length of the current material 1d is X2 = Ht + L1. When the product length L is subtracted from the total length, the remaining material length Lr is longer than or equal to the allowable remaining material length Lmin. In this case, even if the cut is further divided so as to be the product length L, the remaining material is longer than or equal to the allowable remaining material length Lmin.

When the remaining material length Lr that has been divided and cut is not sufficiently secured, the remaining material may not be stably conveyed. For example, the steel materials before and after the division cut are all placed on the transport roll and transported by the rotation of the transport roll. The transport rolls are installed at predetermined intervals, and the remaining material that has been divided and cut must be supported and transported by at least two transport rolls.

If the length of the remaining material that is divided and cut does not have a sufficient length with respect to the distance between the transport rolls, the remaining material cannot be transported stably.

In such a rolling line, the allowable remaining material length Lmin is set as the minimum length required by equipment capable of stably transporting the remaining material.

In the divided cut control device 10 of this embodiment, when the remaining material length Lr is shorter than the allowable remaining material length Lmin, the remaining material is not divided and cut. Instead, the tail end tracking is performed by the HMD 30 and the length measuring roll 32, and the crop cut is performed at an appropriate position near the tail end of the steel material. An appropriate position is set in advance by, for example, the tail end tracking unit 16, and is set to a position in the positive direction of the X axis by Lcrop from the tail end.

Referring back to FIG. The tail end tracking unit 16 is connected to the HMD 30 and the length measuring roll 32. The tail end tracking unit 16 is operable by the signal C2. The HMD 30 generates the tail end passage signal tr after it is determined that the remaining material length Lr is shorter than the allowable remaining material length Lmin. The tail end tracking unit 16 is initialized by the tail end passing signal tr, and calculates the position of the crop cut from the accumulated rotation speed of the length measuring roll 32. The tail end tracking unit 16 outputs a cutting signal CR to the flying shear drive unit 17 when reaching the crop cutting position of the current material 1b where the remaining material is not divided and cut. The flying shear drive unit 17 supplies the drive signal CC to the flying shear 24 based on the cutting signal CR. The flying shear 24 crops the current material 1b based on the drive signal CC.

In the divided cut control device 10, when the remaining material length Lr is longer than or equal to the allowable remaining material length Lmin, the divided cut is performed at a predetermined divided cut position D.

The split cut control device 10 may include a calculation unit that loads a program stored in a storage device (not shown) and executes each step. The calculation unit of the divided cut control device 10 is, for example, a CPU (Central Processing Unit). Each component in FIG. 1 may be realized by a program executed by the arithmetic unit for a part or all of the components.

The split cut control device 10 may be a programmable controller (PLC), and the program may be executed by the CPU of the PLC.

A series of operations of the divided cut control device of the present embodiment will be described using a flowchart. FIG. 3 is an example of a flowchart for explaining the operation of the divided cut control device of the present embodiment.

As shown in FIG. 3, in step S <b> 1, the tip tracking unit 11 inputs an initialization signal ts generated by dividing the preceding material. The tip tracking unit 11 initializes the tip distance Ht with the input initialization signal ts.

The length measuring roll 22 is rotated by the conveyance of the steel material and outputs data of the rotational speed ns of the length measuring roll 22. In step S <b> 2, the tip tracking unit 11 inputs data on the rotational speed ns of the length measuring roll 22. The tip tracking unit 11 calculates the tip distance Ht based on the initialization signal ts and the rotation speed ns data.

In step S3, the tip tracking unit 11 determines whether or not the tail end of the steel material has passed through the final stand 20. When the tail end of the steel material passes through the final stand 20, the tip tracking unit 11 receives the tail end missing signal tt from the load cell 21 of the final stand 20. If the tail end omission signal tt is received, the process proceeds to the next step S4. When the tail end omission signal tt is not received, the process proceeds to step S11. In step S11, the division cut control device 10 performs an operation for normal division cut.

In step S11, when the tip distance Ht reaches the product length L, the process proceeds to step S7, and the cut is divided at the product length L in step S7. If the tip distance Ht does not reach the product length, the process proceeds to step S2.

When the tip tracking unit 11 receives the tail end missing signal tt in step S3, the adder 13 adds the first distance L1 to the tip distance Ht and outputs it in step S4.

In step S5, the remaining material length calculation unit 14 calculates the remaining material length Lr according to the equation (1).

In step S6, the remaining material length determination unit 15 compares the remaining material length Lr with the allowable remaining material length Lmin. If the remaining material length Lr is longer than or equal to the allowable remaining material length Lmin, the process proceeds to the next step S7.

In Step S7, the remaining material length determination unit 15 supplies a signal for cutting to the flying shear 24 so as to divide and cut the steel material at the designated product length L. The flying shear 24 divides and cuts the steel material at a set position in accordance with the cutting signal.

If the remaining material length Lr is shorter than the allowable remaining material length Lmin in step S6, the process proceeds to step S8.

In step S8, the HMD 30 detects that the tail end of the steel material has passed. The HMD 30 supplies the tail end tracking signal tr indicating that the tail end has passed to the tail end tracking unit 16. The tail end tracking unit 16 initializes the position of the tail end.

The length measuring roll 32 provided behind the flying shear 24 outputs data on the rotational speed nr. The data of the rotational speed nr is supplied to the tail end tracking unit 16.

In step S9, the tail end tracking unit 16 calculates the position of the tail end of the steel material based on the data of the tail end passage signal tr and the rotation speed nr. The tail end tracking unit 16 calculates the crop cut position from the calculated tail end position. More specifically, the position of the tail end is initialized by the tail end passage signal tr. The tail end tracking unit 16 calculates the moving distance of the steel material based on the rotation speed nr data and the radius of the length measuring roll 32, and calculates the actual tail end position from the initialized tail end position.

The tail end tracking unit 30 supplies a crop cut signal to the flying shear 24 when the position of the steel material reaches a preset crop cutting position.

In step S10, the flying shear 24 performs crop cutting at an appropriate position of the steel material.

The effect of the division | segmentation cut control apparatus 10 of this embodiment is demonstrated.
In the divided cut control device 10 of the present embodiment, the timing at which the current material 1b is divided and cut from the preceding material 1a by the flying shear 24 is detected, and the current material 1b accumulated by the rotation speed of the length measuring roll 22 from that timing is detected. The tip distance Ht can be calculated. Therefore, even if the tail end of the final split material cannot be tail-tracked during rolling, the length of the remaining material is calculated from the tip distance Ht, the first distance L1, and the specified product length L. Can do.

For example, the distance between the final stand 20 and the flying shear 24 may be about 10 m, and when the product length L exceeds 10 m, it is difficult to detect the tail end of the final material. In such a case, if the remaining material is divided and cut from the final material, the length of the remaining material may be shorter than the allowable remaining material length Lmin, which may cause a trouble in a downstream process. On the other hand, when the remaining material is short or sufficient, it is not preferable that the final material is not divided and is discarded without reducing the yield of the rolling plant.

On the other hand, in the divided cut control device 10 of the present embodiment, as described above, it is possible to determine the presence or absence of the divided cut of the final material by tip tracking. Therefore, a comparison with the allowable remaining material length Lmin can be performed to determine whether or not to appropriately cut the final material. When the remaining material length Lr is sufficient, division cutting can be performed. When the remaining material length Lr is not sufficient, the division cut is not performed, so that there is no possibility of causing trouble in the downstream equipment. In any case, since the final material can be utilized without being discarded, the yield of the rolling plant can be improved.

In the divided cut control device 10 of the present embodiment, when the remaining material length Lr is not sufficient, the tail end tracking can be performed using the data output from the HMD 30 and the length measuring roll 32. Therefore, it is possible to appropriately perform the crop cutting even for the final material that is not subjected to the division cut, and it is possible to use the final material for other purposes.

In this way, even when the distance between the final stand of the rolling mill and the flying shear is short compared to the product length after the division cut, the division cut control that can calculate the length of the remaining material The device 10 can be realized.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

Claims

A split cut control device that splits and cuts a rolled metal material with a flying shear and supplies it to the next process,
A division provided with a calculation unit that detects the position of the tip of the divided metal material, calculates the final division cut position from the tip, and calculates the remaining material length from the final division cut position to the tail end Cut control device.
The computing unit is
A tip tracking unit that tracks the position of the tip using the output of a transport roll that outputs a signal according to the distance transported the metal material, and calculates the distance from the tip to the tail,
A remaining material length calculation unit for calculating the length of the remaining material based on the distance from the tip to the tail end and the product length after the divided cut;
The division | segmentation cut control apparatus of Claim 1 containing this.
The computing unit is
If the length of the remaining material is longer than or equal to a preset allowable remaining material length, perform a final split cut;
The divided cut control device according to claim 2, further comprising a remaining material length determination unit that does not execute the final divided cut when a length of the remaining material is shorter than the allowable remaining material length.
2. The division cut control device according to claim 1, wherein the arithmetic unit is further initialized by a signal for detecting a tail end and further includes a tail end tracking unit for calculating the position of the tail end.