JP4640197B2 - Steel strip processing method and processing equipment - Google Patents

Description

The present invention relates to a method for continuously processing a steel strip in a processing line for a steel strip having a side trimmer and its processing equipment.
In the present invention, “steel strip treatment equipment” refers to recoining equipment, continuous annealing equipment, and continuous plating equipment, and particularly refers to continuous hot dip galvanizing equipment.

  An inspection room for quality inspection of the steel strip is arranged on the downstream side of the side trimmer on the exit side of the steel strip processing facility having the side trimmer in order to inspect the steel strip width after trimming and trimming. . Also, on the exit side of equipment that continuously treats the steel strip, such as continuous hot dip galvanizing equipment and continuous annealing equipment, a side trimmer and an inspection room are arranged in order after the exit looper that stores the steel strip. . And the tension reel which winds up a steel strip is arrange | positioned at the terminal of these lines.

These side trimmers and inspection rooms are installed after the exit side looper as described in Patent Document 1 for the purpose of preventing stop marks in the skin pass mill.
JP 2002-66632 A

  Therefore, a looper, a side trimmer, an inspection room, and a tension reel are arranged in this order on the exit side of the facility for continuously processing the steel strip.

  By the way, in order to adjust the steel strip to a predetermined plate width, the side trimmer that cuts both ends in the width direction has a pair of rotating blades arranged opposite to each other across the steel strip pass line. is doing. When trimming is not performed, the rotary blade is positioned away from both the left and right edges of the steel strip. However, when trimming is performed, the rotary blade is engaged with the steel strip edge at the start of trimming, Set to trim the strip to width.

When this setting is performed, when the trim width is changed, or when the trimming operation is canceled, the running of the steel strip is temporarily stopped.
Also, in the laboratory, when carrying out steel strip thickness / width measurement, surface flaw stop check, polishing check, steel plate flatness measurement, etc., it may be repeated to stop the travel of the steel strip. Is done.

  On the other hand, the continuous annealing furnace and the plating equipment upstream from the delivery equipment such as the side trimmer and the inspection room cannot be temporarily stopped in order to control the annealing temperature of the steel sheet and the coating adhesion amount within a predetermined range. The temporarily stopped portion becomes scrap including the steel plate staying in the continuous annealing furnace.

  In such a steel strip processing line, there is a problem that build-up occurs after winding the coil. “Build-up” is a phenomenon in which local thickness changes in the width direction of a steel sheet are accumulated by being wound up, and the coil is locally raised.

  Since the coil in which the build-up has occurred undergoes local plastic deformation, after the coil is unwound, a defective shape (unsatisfactory flatness) occurs at the edge portion or the central portion. The coil build-up is difficult to find by visual inspection of the flat plate before winding.

  Factors that cause local thickness changes in the width direction that cause this build-up include not only the thickness profile failure in the width direction, but also trim trim failure, overcoat at the edge of the plating, and width direction. There is a poor distribution of the plating adhesion amount.

In particular, in a continuous hot dip galvanizing line, a local thickness change in the width direction is likely to occur due to overcoating at the edge of plating or a poor distribution of plating adhesion in the width direction. Therefore, a belt-like plate is provided orthogonal to the edge plate of the gas wiping nozzle (Patent Document 2), or the gap of the gas wiping nozzle is made variable (Patent Document 3), so that the edge overcoat and the distribution amount of plating in the width direction are distributed. Improvements to defects are being made, but it is difficult to eliminate them all.
Japanese Patent No. 2836482 Japanese Patent No. 3048123

  In the case of a strong build-up, it is possible to visually determine the partial rise from the coil appearance during or after winding. Therefore, it is possible to avoid a large number of defects due to build-up by adjusting the setting of the gap and edge plate of the wiping nozzle that immediately controls the adhesion amount. However, in the case of a mild build-up, it is difficult to determine whether or not a flat defect has occurred from the appearance of the coil that has been wound or the coil that is being wound.

  Therefore, in the steel strip processing line, the flatness can be inspected without cutting the steel strip with a shear while winding the coil to a certain extent in order to detect early defects due to build-up and prevent a large number of defects. The steel strip is rewound until the flatness is inspected regularly. This rewinding inspection is called a back check. The flatness inspection is performed by visual inspection, measurement of the peak height in the longitudinal direction of the steel sheet using a skimming gauge on the surface plate of the inspection room, or measurement of peak height and wavelength.

  In some cases, foreign matter adheres to the roll placed downstream from the exit of the inspection room, and indentation flaws may occur. In this case, the steel strip that has also been wound up (inspection of the polished surface) Can only be found by rewinding to the laboratory. Therefore, the back check needs to be performed periodically for early detection of indentation flaws on the roll downstream from the exit of the examination room and prevention of a large number of defects.

As a build-up inspection method, Patent Document 4 discloses a method of positioning a sensor for continuously measuring the build-up amount in the coil width direction on the outer periphery of a coil to be wound. According to this method, the back check can be performed most easily, and the flatness can be measured, so that it is reliable as inspection management.
JP-A-8-267131

  However, when the coil is rewound, the steel strip travels in the reverse direction on the side trimmer, so it is necessary to open the rotary blade from both ends of the steel strip to prevent scuffing on the steel strip. is there. Moreover, the operation | work of once cut | disconnecting the trim ear wire (The scrap of the steel strip continuously isolate | separated by the rotary blade from both sides of a steel strip when trimming a steel strip to predetermined width) generate | occur | produces. After the back check, the rotary blade is reset at a predetermined trim position.

As described above, in a processing facility equipped with a side trimmer, a plurality of operations are performed by the side trimmer during back check, so that workability is deteriorated.
In addition, if the setting position shifts when the rotary cutter is reset, or if the steel strip meanders when the steel plate is re-transported in the winding direction, the trimmed part will be partially trimmed again. There is a case. In this case, the beard-like ear dust remains on the end face, and the back check causes the quality (trim quality) of the end face portion of the steel strip that has been back checked.

As described above, the back check is an important inspection method in the processing line of the steel strip, but this is not easy when the side trimmer is provided.
In addition, with the method using the above-described sensor, it is impossible to find the indentation flaw that occurs in the roll downstream from the exit of the examination room.

  The problem to be solved by the present invention is that, in the processing line of the steel strip having the side trimmer, the workability is deteriorated in the side trimmer portion and the trim quality is deteriorated at the time of back check.

The steel strip treatment method of the present invention is
In order to prevent the workability in the side trimmer part from deteriorating and the trim quality from deteriorating during the back check,
When processing a steel strip in a processing facility equipped with a side trimmer and a tension reel in order from the upstream side to the downstream side, when the steel strip wound around the tension reel is rewound and inspected the steel strip,
The main feature is that the steel strip is stored between the tension reel and the side trimmer, and the steel strip is not rewound upstream from the storage section, and the side trimmer is inspected with the steel strip in the stopped state. Yes.

The steel strip treatment method of the present invention is
In the steel strip processing equipment equipped with a side trimmer and tension reel in order from the upstream side toward the downstream side,
When the steel strip is rewound from the tension reel between the side trimmer and the tension reel, the steel strip processing equipment provided with a rewind looper for storing the rewound steel strip, and the winding It can be implemented by a steel strip processing facility further provided with an inspection room for inspecting the quality of the steel strip between the return looper and the tension reel.

  Moreover, if the continuous processing equipment of the steel strip provided with the outgoing side looper which stores a steel strip on the outgoing side, for example, the hot dip galvanizing equipment, is arranged on the upstream side of the processing equipment of the steel strip of the present invention, the outgoing side The steel strip that has passed through the looper can be continuously processed by the processing equipment for the downstream steel strip.

  According to the present invention, the side trimmer portion can perform the back check of the steel strip while the steel strip is in a stopped state, so the back check can be performed without deteriorating the workability and trim quality of the side trimmer portion. Is possible. Further, the present invention can be implemented using a looper having a small steel strip storage amount (loop capacity), can be reduced in terms of equipment, and can be installed on an existing line.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 includes an exit-side looper 5 for storing a steel strip 4 on the upstream side of a steel strip treatment facility 3 provided with a side trimmer 1 and a tension reel 2 in order from the upstream side to the downstream side. For example, it is the schematic which showed the delivery side of the continuous processing equipment which has arrange | positioned the hot dip galvanization equipment 6. FIG.

  In this continuous processing facility, for example, a vertical rewinding looper 7 for storing the steel strip 4 unwound from the tension reel 2 during back check is disposed between the side trimmer 1 and the tension reel 2, and this rewinding is performed. An inspection room 8 is further arranged between the looper 7 and the tension reel 2.

In the continuous processing facility of the present invention having the configuration shown in FIG. 1, the back check is performed as follows.
For example, during winding at a steady plate speed of 80 mpm, in response to a winding interruption command from the inspection room 8, the traveling of the steel strip 4 downstream from the exit side looper 5 is stopped, and trimming by the side trimmer 1 is interrupted. The winding by the tension reel 2 is stopped. In the exit looper 5, the storage is performed as the side trimmer 1 stops passing.

  Next, based on the rewind command, for example, rewinding of the tension reel 2 is started at a rewind speed of 10 mpm. Along with this, the looper carriage 7 a constituting the rewinding looper 7 is raised by, for example, the rewinding length and stored in the rewinding looper 7. Rewinding is stopped when the storage amount of the rewinding looper 7 reaches a predetermined amount.

  Due to the action of the rewinding looper 7, even if the steel strip 4 is rewound from the tension reel 2, the steel strip 4 located in the side trimmer 1 can be maintained in a stopped state and travels in the reverse direction. Disappears. Therefore, it is not necessary to open the rotary blade, the ear wire, and the resetting of the blade constituting the side trimmer 1.

  Next, rewinding is completed at a point where a predetermined amount of storage is completed, and the flatness and indentation flaws of the steel strip 4 are inspected in the inspection room 8. After completion of the inspection for one minute, for example, winding onto the tension reel 2 is resumed at 180 mpm. At this time, the traveling of the side trimmer 1 is stopped, the looper carriage 7a is lowered, and the stored steel strip 4 is paid out. When the payout from the rewinding looper 7 is completed, the side trimmer 1 is resumed. At the time when the steel strip storage amount of the exit side looper 5 disappears, the winding speed is reduced to the plate speed of 80 mpm on the upstream side of the exit side looper 5.

  By doing so, in the side trimmer 1 part, trimming of the steel strip 4 can be resumed while maintaining the state before the back check, and the trim quality is not deteriorated. This is the processing method of the present invention. Further, according to the present invention, it is possible to shorten the time by about 6 minutes with one back check, and the productivity is improved.

Next, the length of the steel strip 4 that can be stored by the rewinding looper 7 will be described with reference to FIG.
When the flatness is confirmed by back check, the steel strip 4 having a length longer than the length by which the flatness can be confirmed may be rewound. Therefore, the flatness can be confirmed if the coil winding portion of the steel strip 4 being wound in the inspection room 8 returns more than the length that can confirm the flatness.

  Therefore, when only flatness is inspected, the maximum storage length H of the steel strip 4 in the rewinding looper 7 is the inspection position from the contact point of the steel strip 4 and the coil wound at the maximum winding diameter of the tension reel 2. L1 + α or more, for example, if the path length to (usually the examination room 8) is L1 (usually about 10 to 20 m) and the path length necessary for the flatness inspection is α (usually about 1 to 4 m), for example When L1 is 15 m and α is 1 m, H should be 16 m or more.

  On the other hand, when inspecting only the indentation with the roll downstream from the inspection room 8, the maximum storage length H in the rewinding looper 7 is between the inspection position (usually the inspection room 8) and the tension reel 2. If the path length from the first roll upstream from the tension reel 2 to the inspection position is L2 (m) and the first roll diameter is D2 (m), L2 + D2 × π or more, for example L2 Is 10.5 m and D2 is 0.8 m, H is 13 m or more.

However, depending on the path length and roll diameter, the aforementioned L1 + α <L2 + D2 × π may be satisfied. In this case, the flatness cannot be inspected.
When inspecting both flatness and indentation wrinkles, the maximum storage length of the rewinding looper 7 may be set so that H ≧ L1 + α and H ≧ L2 + D2 × π.

  Thus, the unwinding looper 7 installed in the processing facility of the present invention has a steel strip storage length (loop of several hundred meters) like the exit side looper 5 installed on the exit side of a normal continuous processing facility. (Capacity) is not necessary, and can be implemented using a small looper having a loop capacity of several tens of meters. Therefore, the cost can be reduced in terms of equipment, and additional installation on an existing line is also possible.

  The present invention is not limited to the above example, and it goes without saying that the embodiment may be appropriately changed within the scope of the technical idea described in each claim.

  For example, the rewinding looper 7 may be either a vertical type or a horizontal type as shown in FIG. 1 as long as it has a function of temporarily storing the steel strip 4 that has been rewound. Further, a plurality of paths may be used instead of two paths. Moreover, the structure is not ask | required if the steel strip 4 can store the target length.

Shows the exit side of a continuous processing facility in which a hot dip galvanizing facility with an exit looper is arranged on the upstream side of the steel strip processing facility with a side trimmer and tension reel in order from the upstream side to the downstream side. FIG. It is a figure for demonstrating the length of the steel strip which can store the rewinding looper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Side trimmer 2 Tension reel 3 Steel strip processing equipment 4 Steel strip 5 Outlet looper 6 Hot dip galvanizing equipment 7 Rewinding looper 8 Inspection room

Claims (5)

When processing a steel strip in a processing facility equipped with a side trimmer and a tension reel in order from the upstream side to the downstream side, when the steel strip wound around the tension reel is rewound and inspected the steel strip,
The steel strip is stored between the tension reel and the side trimmer, and the steel strip is not rewound upstream from the storage portion, and the side trimmer is inspected with the steel strip in a stopped state. Processing method. In the steel strip processing equipment equipped with a side trimmer and tension reel in order from the upstream side toward the downstream side,
A steel strip processing facility comprising a rewinding looper for storing the rewound steel strip when the steel strip is rewound from the tension reel between the side trimmer and the tension reel. .   The steel strip processing facility according to claim 2, further comprising an inspection room for inspecting the quality of the steel strip between the rewind looper and the tension reel. On the upstream side of the steel strip treatment facility according to claim 2 or 3, a steel strip continuous treatment facility provided with an exit looper for storing the steel strip on the exit side is disposed.
A steel strip processing facility, wherein the steel strip that has passed through the exit side looper is continuously processed by a downstream steel strip processing facility. The steel strip processing facility according to claim 4, wherein the continuous processing facility for the steel strip disposed on the upstream side is a hot dip galvanizing facility.

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