JP2006241578A - Method for producing metal strip and metal strip treating process line - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate a line trouble caused by harmful defect, without beforehand cutting the harmful defect portion. <P>SOLUTION: In a process line for performing various kinds of treatments containing an annealing treatment, a plating treatment or a temper rolling of a metal strip, this line is provided with; a pay-off length measuring instrument 16 for measuring the pay-off length of the metal strip; and a control means 21, in which at least one side of the defective portion and defect marking in the metal strip, decided from the defective position information obtained from an inspection unit for process line at the upper process in the process line performing each treatment, is tracked based on the output of the pay-off length measuring instrument, and when the defective portion or the defect marking in the metal strip is passed through each facility in the process line, the facility for receiving the damage by passing the defective portion is retreated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a continuous strip in a process line that performs various treatments such as rolling, annealing, or plating on a metal strip such as a steel plate, an aluminum plate, and a copper plate, in particular, a strip-like steel plate (hereinafter referred to as a strip). The present invention relates to a metal strip manufacturing method and a metal strip processing process line that can prevent a line trouble due to harmful defects that occur when the sheet is passed through.

Hereinafter, the prior art of this type of metal strip treatment process line will be described by taking a line for continuously annealing a cold-rolled strip as an example.
In a process line for annealing a strip, the strip is generally carried as a wound coil and mounted on a coil unwinding device (hereinafter referred to as a payoff reel). The strip unwound from the payoff reel is placed in an annealing furnace, subjected to an annealing treatment, and then temper-rolled. Thereafter, after dimensional inspection, surface inspection, and other predetermined inspections, it is wound up again in a coil shape, sent to the process line or inspection line of the next process, or shipped to the customer as an external sales coil.

  In such a process line, when a harmful defect with peeling or depression called “hege” passes through a temper rolling mill, wrinkles may enter the roll. Since the marks resulting from roll wrinkles will be transferred to the strip one after another, in this process line, the strip is regularly inspected, and if a roll wrinkle is found, the temper rolling mill rolls are replaced quickly. is doing. In addition, if a harmful defect part passes also in a plating line, since a crack will enter into a plating roll similarly, damage will generate | occur | produce. In this way, if no harmful defect is found in the upper process (upstream process) etc., roll defects will occur suddenly due to the passage of the harmful defect part, resulting in a reduction in strip quality or work efficiency. It will be said that.

On the other hand, when a wrinkle inspection device is installed in the upper process line and a harmful defect is recognized by the wrinkle inspection device, the following operations are possible.
(1) If the harmful defect is within a relatively short range of the leading edge or tail edge of the strip, the charging is performed after the harmful defect portion has been cut in advance in the above-mentioned process line that recognizes the defect or a separate processing line. In general, the cutting may be performed on the process line entering side.
(2) When the harmful defect is in a range other than the above, it is generally charged after the harmful defect portion is cut by another line. The reason for this is that strip inspection is usually performed at the final stage of the line, and even if a harmful defect is recognized at that position, the cutting process will not be in time, or if it is cut while passing continuously, it will be safe. For this reason, it is often necessary to cut an extra amount compared to the length of the harmful defect portion because it must be cut with a margin. In some cases, the line must be stopped or the line speed must be reduced for the cutting process, resulting in a reduction in production efficiency.

  As described above, except for the case where there is a defect at the tip or tail of the strip, it is necessary to work on a separate line in order to remove the harmful defect part, and there are problems such as reduced efficiency and increased work cost. It will occur.

To solve the above-mentioned problems, for example, there are at least two or more payoff reels, and a stripping device that is paying out from a certain payoff reel to the processing facility is stopped while paying out, and two cutting devices are used. The part of the strip that has already been dispensed into the processing facility is welded to the tip of another strip that is dispensed from another payoff reel, and the divided strip is passed through. A technique has been proposed in which the remaining undelivered coiled strip is not pulled out from the payoff reel as it is, and after another strip is discharged from another payoff reel into the processing facility, the processing strip is repaid into the processing facility. (For example, Patent Document 1).
JP-A-6-304651

  In the case of the prior art as described above, even if the harmful defect portion is cut in a separate process or cut on the entry side of the own process, a reduction in work efficiency is inevitable. In particular, in order to cut on the entry side, work such as stopping at the defective part, cutting, welding, etc. will occur and work efficiency will be greatly reduced, yield will be reduced by cutting harmful defect parts. there were.

  The present invention has been made to solve the above-described problems, and a metal strip manufacturing method capable of eliminating line troubles caused by harmful defects without cutting the harmful defect parts in advance, and An object is to provide a metal strip treatment process line.

  The manufacturing method of the metal strip according to the present invention is a process line that performs various treatments including annealing treatment, plating treatment or temper rolling of the metal strip, and the defect portion of the metal strip passes through each facility of the process line. Evacuate facilities that are damaged by passing the part.

  Further, the metal band processing process line according to the present invention is a process line for performing various processes including metal band annealing, plating or temper rolling, and a payout length measuring means for measuring the payout length of the metal band; In addition, at least one of the defect site and the defect marking of the metal strip determined from the defect position information obtained by the inspection apparatus of the process line above the process line for performing each processing is output to the payout length measuring unit. And a control means for evacuating the equipment damaged by passing through the defective portion when the defective portion of the metal strip or the defect marking passes through each facility of the process line.

  Further, the metal band processing process line according to the present invention is a process line for performing various processes including metal band annealing, plating or temper rolling, and a payout length measuring means for measuring the payout length of the metal band; A defect part of the metal band based on at least one of the defect position information and the defect marking obtained by a puncher for making a hole in the metal band, and a process line inspection device in an upper process step than the process line for performing each processing A punch hole is opened in the periphery by the puncher, and the punch hole is tracked based on the output of the payout length measuring means in the same manner as the punch hole formed in the welded portion. And a control means for evacuating the equipment damaged by passing through the defective part when passing through.

  According to the present invention, the harmful defect portion is treated the same as the welded portion, and the roll is retracted when the defective portion passes through the position of the plating roll, the temper rolling roll, etc. Line trouble can be prevented, and it is not necessary to cut the harmful defect portion in advance, and problems such as efficiency and yield reduction can be solved. Further, not only the roll but also the equipment damaged by passing through the defective part can be retreated in the same manner, and the above problems such as prevention of line trouble can be solved.

Embodiment 1. FIG.
FIG. 1 is a main part layout diagram of a continuous annealing line of a strip (steel strip) to which the present invention is applied, and this continuous annealing line will be described as a first embodiment. In FIG. 1, 1a and 1b are rewinding devices, 2 is a welding machine, 3 is a cleaning device, 4 is an entrance side looper, 5 is a continuous annealing facility, 6 is an exit side looper, 7 is a temper rolling mill, and 8 is a surface. Defect inspection device, 9 is a side trimmer device, 10 is a quality inspection device, 11 is an exit side inspection unit, 12 is an exit side shear, and 13a and 13b are winding devices. As the quality inspection device 10, a surface defect inspection device (a device different from the surface defect inspection device 8), a plate width meter, a plate thickness meter, or a pinhole detector, inclusion detector, iron loss meter, etc. are required. Depending on the situation, it will be installed appropriately.

  The strip S unwound from the unwinding device 1a or 1b is connected to the preceding strip S by the welding machine 2, cleaned by the cleaning device 3, and subjected to the required heat treatment by the continuous annealing equipment 5, and the temper rolling mill 7 The strips are subjected to temper rolling, side trimming is performed by the side trimmer device 9 as necessary, surface defects, plate thickness, plate width, etc. are inspected by the quality inspection device 10, and the winding device 13a or 13b is used. When it is wound up and reaches a predetermined weight, it is divided by the delivery side shear 12 and paid out of the line. The temper rolling may be either wet rolling or dry rolling.

  Here, it is necessary to track the position of the connecting portion (welded portion) of the strip continuously inserted in the line from the viewpoint of operation management or quality control. For this purpose, for example, a punch hole is made in the vicinity of the welded portion of the strip during welding, and by detecting the punched hole in each part of the line, it is possible to recognize where the welded portion of the strip has passed. ing.

  In such a welded part, the strip is changed before and after that, and the welded part itself is a kind of defective part, and if the temper rolling mill 7 is passed as it is, the roll will be wrinkled. When passing, the rolling roll is retracted to prevent the roll from wrinkling, and rolling is started by changing the rolling conditions suitable for the next strip. The present invention intends to prevent roll wrinkles due to harmful defects using such a mechanism, and examples in which the present invention is applied to a continuous annealing line of this strip will be described as Embodiments 2 and 3.

Embodiment 2. FIG.
FIG. 2 is a schematic view of a steel sheet processing process line according to Embodiment 2 of the present invention. In addition to the devices necessary for the second embodiment, FIG. 2 includes a device to be applied to a third embodiment described later for convenience.

  The host computer 23 uses the position information (position information in the length direction) of harmful defects detected by a surface defect inspection apparatus (not shown) installed in the process line of the upper process (upstream process) as the upper computer of the upper process. 22 and so on, and output to the line control device 21. When the coil is inserted into the process line, the line control device 21 adds a sign (information) of the harmful defect to the corresponding position of the strip from the position information of the harmful defect from the upper process. Here, since the tip portion may be cut when the strip is loaded, the cut length is measured by the strip dispensing length measuring device 16, and the line control device 21 corrects the cut length. Is defined as a harmful defect position.

  Alternatively, when the harmful defect portion of the strip S is marked in the upper process line, the marking portion is detected by the mark detector 18 installed on the process line entrance side, and this position is detected as the harmful defect position. It is good.

  The line control device 21 tracks the harmful defect portion generated by the above-described processing while taking in the payout length of the strip from the payout length measuring device 16, and when this portion passes, for example, the temper rolling mill 7, The roll is retracted in the same manner as other welds.

Embodiment 3. FIG.
The host computer 23 inputs the position information of the harmful defect detected by the surface inspection apparatus (not shown) installed in the process line of the upper process from the host computer 22 of the upper process and outputs it to the line control device 21. . When the coil is inserted into the process line, the line control device 21 measures the discharge length from the strip tip by the strip discharge length measuring device 16, and when the harmful defect portion reaches the position of the puncher 19. Then, the line is automatically stopped, and punch holes are made by the puncher 19 on the strip end side of the harmful defect portion in the same manner as in the case of the welded portion.

  Alternatively, when the harmful defect portion of the strip S is marked in the upper process line, the line control device 21 detects that the mark detector 18 installed on the process line entry side detects the marking portion. Then, tracking is performed while taking in the payout length of the strip from the payout length measuring device 16, and the line is automatically stopped when this portion reaches the position of the puncher 19. And a punch hole is made by the puncher 19 on the strip end side of the harmful defect portion. In any of the above cases, when the harmful defect portion reaches the process line entry side and stops the line, it is more reliable if it is confirmed visually or with a monitoring camera or the like.

  Although the host computer 23 manages the coil welded portion (to manage whether or not there is an abnormal operation such as whether or not a plurality of coils in the previous process are one in this process). In order to distinguish between the signal that detects the punch hole opened in the harmful defect site by the above processing and the signal that detects the punch hole opened in the weld site, the punch hole in the hazardous defect site is treated as a singular point. . By doing so, the host computer 23 is prevented from erroneously determining one coil as a plurality of coils. However, in terms of data management, coil information (coil ID, coil number, etc.) is virtually divided and handled as a plurality of different coils with the singularity as a boundary. Thus, although it is actually one coil, it can be handled as a plurality of coils in the data processing, and the singularity can be treated as no difference from the welded portion. The singular point is that when this coil is processed in the next process (downstream process), the welding part is cut on the exit side of this process, and the welding part ( This is to cut and weld the steel plate's plate tip and tail, but to avoid cutting (or welding) singular points (harmful defect sites) on the exit side of this step and the entry side of the next step. Actually, the coil is not cut, but by treating the coil information only, the coil does not cut at that part until the singularity reaches the end of the final process. Since the welding process is not performed and the coil is used up to the final process, the working efficiency is improved and the yield is also improved.

  The line control device 21 tracks the welded part (or singular point) generated by the above-described processing, and when this part passes, for example, the temper rolling mill 7, the roll is the same as in the case of other welded parts. Evacuate. It should be noted that the punch hole is corrected at the tracking position of the punch hole (welded portion, defective portion) by detecting the punch hole in each downstream portion of the line.

Embodiment 4 FIG.
In addition, although said embodiment demonstrated the example which applied this invention to the continuous annealing line of a strip, it can apply similarly to the plating roll of a plating line. In the present invention, as a facility for retreating when a defective part passes through the process line, in addition to the above-mentioned roll, the distance between the strip and the strip is narrow, for example, a magnetic sensor, an ultrasonic sensor, etc. Various types of inspection equipment are also covered.

The layout of the principal part installation of the continuous annealing line of the strip to which this invention is applied. Schematic which shows an example of the process line which concerns on Embodiment 2, 3 of this invention.

Explanation of symbols

1a, 1b rewinding device (payoff reel)
2 Welding Machine 3 Cleaning Device 4 Incoming Looper 5 Continuous Annealing Equipment 6 Outlet Looper 7 Temper Rolling Mill 8 Surface Defect Meter 9 Side Trimmer Device 10 Quality Inspection Equipment 11 Outlet Inspection Unit 12 Outlet Shears 13a and 13b Winding Device 15 Pinch roll 16 Dispensing length measuring device 17 Shear 18 Mark detector 19 Puncher 20 Processing equipment 21 Line control device 22 Upper process upper computer 23 Upper computer S Strip

Claims (3)

In a process line that performs various treatments including annealing, plating or temper rolling of metal strips,
A method for producing a metal strip, characterized in that when a defective portion of the metal strip passes through each facility of the process line, the facility damaged by the passage of the defective portion is retracted. In a process line that performs various treatments including annealing, plating or temper rolling of metal strips,
A payout length measuring means for measuring the payout length of the metal strip;
Based on the output of the payout length measurement means, at least one of a defect site and a defect marking of a metal strip determined from defect position information obtained by an inspection apparatus for a process line above the process line for performing each process And a control means for evacuating the equipment damaged by passing through the defective part when the defective part of the metal band or the defect marking passes through each equipment of the process line. Process line. In a process line that performs various treatments including annealing, plating or temper rolling of metal strips,
A payout length measuring means for measuring the payout length of the metal strip;
A puncher that pierces a metal strip,
Based on at least one of the defect position information and the defect marking obtained by the inspection apparatus for the process line above the process line for performing each processing, a punch hole is made by the puncher at or near the defect portion of the metal band. The punch hole is tracked based on the output of the payout length measuring means in the same manner as the punch hole formed in the welded portion, and when the punch hole passes through each facility of the process line, damage is caused by passing through the defective part. And a metal strip processing process line characterized by comprising control means for evacuating the receiving facility.

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