JP2010023099A - Continuous pickling and cold-rolling equipment and method of manufacturing cold-rolled material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the production efficiency of the whole line by reducing the inlet-side cycle time of continuous pickling and cold-rolling equipment. <P>SOLUTION: A method of manufacturing the cold-rolled material is provided with: a welding step where the end part of a preceding steel strip and the end part of a succeeding steel strip are cut, the preceding steel strip and the succeeding steel strip after cutting are butted and a welded steel strip is obtained by performing the laser welding of the butted part; a pickling step where a pickled steel strip is obtained by pickling the welded steel strip; and a cold-rolling step where a cold-rolled material is obtained by cold-rolling the pickled steel strip. Furthermore, the method is provided with a first step where notched parts are formed on the edges of the joined part of the welded steel strip between the welding stage and the pickling stage and a second step where notches are formed on the edges of the joined part of the pickled steel strip between the pickling step and the cold-rolling step, and the cold-rolled material is manufactured by selecting any one of the first step, the second step and the combination of the first step and the second step on the basis of information of the width difference between the preceding steel strip and the succeeding steel strip and existence of width change between the pickling step and the cold-rolling step. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a continuous pickling cold rolling facility for pickling hot rolled steel strip and then cold rolling, and a method for producing a cold rolled material.

  Conventional proposals for continuous pickling and cold rolling equipment that directly connects the pickling process for pickling hot strips and the cold rolling process for cold rolling hot picked steel strips There have been many. For example, in Patent Document 1, a welding machine that welds a preceding steel strip and a subsequent steel strip from upstream to downstream, a pickling tank that pickles the welded steel strip, and a plate width of the steel strip is changed. Side-trimmer and cold-rolling machine for cold-rolling pickled steel-washed steel strips in this order, and continuous pickling cold-rolling equipment with loopers for storing steel strips between each device The invention which concerns is disclosed. Since this continuous pickling and cold rolling facility is an assembly of various apparatuses, it is necessary to secure a large site for its installation. In the invention disclosed in Patent Document 1, it has been attempted to install a continuous pickling and cold rolling facility in a limited site by using a helical turner or the like that changes the course of the steel strip.

  In this continuous pickling and cold rolling equipment, in addition to the above-described welding machine, pickling tank and cold rolling mill, in addition, for detecting a welded portion between the welding machine and the pickling tank. A puncher device for forming a punch hole in the welded steel strip and a notch device for forming a notch at the end in the width direction of the welded steel strip including the welded portion are arranged. These devices will be described.

  FIG. 7 is an explanatory view showing the vicinity of the joint 4 of the welded steel strip 3 obtained by welding the preceding steel strip 1 and the subsequent steel strip 2 with a welding machine. Generally, in a continuous line that continuously processes steel strips, a welding machine that connects the preceding steel strip 1 and the subsequent steel strip 2 is installed, and the joint 4 that is joined by this welder arrives. Is detected, and the operating conditions of the pickling tank and the cold rolling mill are changed. Therefore, as shown in FIG. 7, a punch hole 5 having a diameter of about 10 mm is formed in the vicinity of the joint point 4, and the installation position of the punch hole 5 is accurately detected by an optical detector. The position of 4 is grasped.

  FIG. 8A is an explanatory view showing various joining states of the preceding steel strip 1 and the succeeding steel strip 2. The preceding steel strip 1 and the subsequent steel strip 2 to be welded have different plate widths as shown in (2) and (3) of FIG. 8 (a), or (1) in FIG. 8 (a). As shown in FIG. 4, even when the plate width is the same, a positional shift in the width direction may occur when welding. As described above, when cold rolling is performed with the rear end of the steel strip 1 or the tip of the steel strip 2 protruding in a stepped shape at the end of the joint 4, excessive stress is concentrated on the joint 4. There arises a problem such as breakage, or a rolling load suddenly fluctuates with a sudden change in sheet width and the rolling shape becomes unstable. Therefore, as shown in (1) to (3) of FIG. 8B, a gentle notch 6 is formed at the end of the joint portion 4.

  For this reason, a puncher device for forming punch holes 5 and a notch device for forming notches 6 are arranged downstream of the welding machine of the continuous pickling and cold rolling equipment, and the welded steel strip 3 The punch hole 5 and the notch 6 are formed in the front.

  FIG. 9A is an explanatory diagram showing a procedure for forming the punch hole 5 and the notch 6 in the welded steel strip 3. As shown in FIG. 9 (a), after feeding the trailing end of the preceding steel strip 1, the leading end of the trailing steel strip 2 is sent, and the trailing end of the leading steel strip 1 and the leading end of the trailing steel strip 2 are cut. Then, after stopping both the preceding steel strip 1 and the following steel strip 2, they are welded by a welding machine to form a welded steel strip 3, and the joint 4 of the welded steel strip 3 is transferred to a puncher device and a notch device. The welded steel strip 3 is stopped, and thereafter the punch hole 5 is formed by the puncher device and the notch 6 is formed by the notch device.

  Thereafter, the welded steel strip 3 is sent to the pickling tank, but pickling in the pickling tank is performed while the welded steel strip 3 is running, so that the welded steel is between the welder and the pickling tank. By accumulating the band 3, a pickling tank entrance side looper is provided to absorb the difference in cycle time between the welding machine and the pickling tank.

In this continuous pickling and cold rolling equipment, especially when processing steel strips with a small unit weight or when the processing capacity of pickling tanks or cold rolling mills is high, continuous pickling and cold rolling The production efficiency of the entire facility is limited by the cycle time (entry side cycle time) of a puncher device or notch device arranged upstream of the pickling tank inlet side looper.
JP-A-7-164008

  However, in order to accurately stop the welded steel strip 3 at a predetermined position of the puncher device and the notch device in the continuous pickling and cold rolling facility, the weight of the welded steel strip 3 is large and the inertial force thereof is large. Transfer to the device and notch device must be performed at a low speed. For this reason, not only the time for forming the punch hole 5 and the notch 6 in the welded steel strip 3 is required, but also the transfer of the welded steel strip 3 to the puncher device or the notch device is performed at a low speed. As a result, the entry-side cycle time inevitably increases, and the production efficiency of the entire continuous pickling and cold rolling process decreases.

  In order to shorten the entry-side cycle time, a plurality of hot-rolled steel strip payout reels are arranged side by side to shorten the idle time that occurs when the leading end of the succeeding steel strip is welded to the trailing end of the preceding steel strip. However, this increases the line length of the continuous pickling and cold rolling equipment, that is, the site area necessary for installing the continuous pickling and cold rolling equipment, and the continuous pickling and cooling equipment. The equipment cost of the hot rolling equipment is further increased.

  The object of the present invention is to reduce the cycle time of the continuous pickling and cold rolling equipment for pickling and cold rolling hot rolled steel strip, thereby reducing the equipment cycle time of the continuous pickling and cold rolling equipment. It is to provide a continuous pickling cold rolling facility and a method for producing a cold rolled material that can improve the production efficiency without increasing the cost.

  Even in a continuous line of steel strip with a pickling tank inlet side looper, especially when the coil weight is small or the processing capacity of the pickling tank or cold rolling mill is high, this pickling tank inlet side looper Since the cycle time of the equipment arranged on the upstream side controls the production efficiency of the entire continuous line, it is possible to reduce the inlet side cycle time of the equipment arranged on the upstream side of the pickling tank inlet side looper. It is extremely important for improving the production efficiency of continuous lines.

  As a result of intensive studies based on this recognition, the present inventors have arranged the rotary blade into the notch formed by the notch disposed between the pickling tank and the cold rolling mill. Attention was paid to a side trimmer device (running trimmer) for changing the plate width of the pickled steel strip by trimming the widthwise end of the pickled steel strip in the running state. And the continuous provided with the notch apparatus which forms a notch in the edge part of the width direction including the joined part of the welded steel strip in a stopped state, and the side trimmer device which changes the plate width of the pickled steel strip in the running state In the type pickling cold rolling equipment, the presence or absence of notch formation by the notch device is determined based on the difference in sheet width between the preceding steel strip and the subsequent steel strip and the presence or absence of trimming work by the side trimmer device. When it is not necessary to form a notch with the device, the entry side cycle time due to the formation of the notch with the notch device can be reduced by forming the notch with the side trimmer device. The present inventors have found that it is possible to improve the production efficiency of the entire pickling cold rolling facility, and have further studied and completed the present invention.

  The present invention is directed to a welding apparatus that abuts a preceding steel strip and a succeeding steel strip from upstream to downstream and welds the butted portion to obtain a welded steel strip having a joint, and pickling the welded steel strip. A pickling tank for obtaining a pickled steel strip, and a continuous pickling cold rolling facility in which a cold rolling machine for cold rolling the pickled steel strip is directly connected, and a welded steel strip joint A notch device that forms a notch in the widthwise end including a side trimmer device capable of changing the plate width of the pickled steel strip while running the pickled steel strip, a welding device and a pickling tank , And between the pickling tank and the cold rolling mill, respectively, based on the difference in sheet width between the preceding steel strip and the subsequent steel strip, and information on the presence or absence of trimming work in the side trimmer device The notch device determines whether it is necessary to form a notch. Based on the result of this determination, the notch device And a continuous pickling cold rolling equipment characterized in that it comprises a driving pattern determination means for determining a side trimmer apparatus each operation pattern.

  In the continuous pickling and cold rolling facility according to the present invention, a punch hole for detecting the position of the joint is formed after the trailing end of the preceding steel strip stops at the welding apparatus until the welding is completed. It is preferable to provide a puncher device that can be formed into a puncher.

  In these continuous pickling and cold rolling facilities according to the present invention, it is preferable that the welding apparatus includes a fiber laser welding machine including an oscillation medium composed of a fiber crystal that oscillates a laser beam.

In these continuous pickling and cold rolling facilities according to the present invention, it is preferable that the welding apparatus includes a heating means for heating the butt portion.
Further, in these continuous pickling and cold rolling facilities according to the present invention, it is preferable that the steel strip dispensing device disposed upstream of the welding device has a cleaning means for cleaning the steel strip surface.

  From another point of view, the present invention cuts the rear end of the preceding steel strip and the front end of the succeeding steel strip, but butts the preceding steel strip and the succeeding steel strip after cutting, and this butt portion is laser-treated. A welding process for obtaining a welded steel strip having a joint by welding, an acid tip process for pickling the welded steel strip to obtain a pickled steel strip, a cold rolled material by cold rolling the pickled steel strip A cold rolled material manufacturing method comprising a cold rolling process to obtain, and further forming a notch at a width direction end including a welded steel strip joint between the welding process and the acid tip process A first step, and a second step of forming a notch at the end in the width direction including the joined portion of the pickled steel strip between the pickling step and the cold rolling step, Based on the difference in the plate width of the subsequent steel strip and the information on the presence or absence of trimming work between the pickling process and the cold rolling process, the first process, the second process, It is a manufacturing method of a cold-rolled material and selects one of the combination of the first and second steps.

  According to the present invention, the entry-side cycle time of a continuous pickling cold rolling facility for pickling and cold rolling a hot-rolled steel strip can be reduced. The production efficiency can be improved without increasing the equipment cost.

Hereinafter, the best mode for carrying out the continuous pickling cold rolling equipment and the method for producing a cold rolled material according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is an explanatory diagram schematically showing a configuration of a continuous pickling and cold rolling facility 10 according to the present embodiment.

As shown in FIG. 1, the continuous pickling and cold rolling facility 10 includes a steel strip discharging device 20, a welding device 13, a notch device 14, a pickling tank 15, Since the trimmer 17, the cold rolling mill 16, the steel strip winding device 25, and the operation pattern determination means are provided, these will be described sequentially.
[Steel strip dispensing device 20]
FIG. 2 is an explanatory view showing the steel strip dispensing device 20 disposed upstream of the welding device 13. As shown in the figure, the steel strip dispensing apparatus 20 desirably includes cleaning means (not shown) for injecting cleaning water 21 onto the steel strip surface to clean the steel strip surface. The reason for this will be explained.

  As shown in FIG. 2, when the hot-rolled steel strip 20a wound in a coil shape is inserted into the processing line and rewound, a reduction device called a pressure roll 20b is provided in order to prevent a surface abnormality called hip folding. It is done. The pressure roll 20b imparts bending strain to the steel strip 20a, which also serves as a scale breaker. When the coil is discharged, scale dust (powder) peeled off from the steel strip 20a is generated. Since the scale dust accumulates in the line or adheres to the surface of the sheet-rolling roll and hinders the operating environment of the equipment, the peeling scale is removed by washing the surface of the steel strip 20a with the washing water 21. It is desirable.

As such a cleaning means, for example, a known means as disclosed in Japanese Patent No. 3458746 may be used, and it is not limited to a specific means.
By cleaning the surface of the steel strip with this cleaning means, it is possible to prevent erroneous detection of the optical sensor provided for detecting the position of the steel strip and the operating position of the apparatus.

In addition, the code | symbol 22 in FIG. 2 is a deflector roll which changes the conveyance direction of a steel strip to a horizontal direction, the code | symbol 23 is a leveler, Furthermore, the code | symbol 24 is a ringer roll which drains the steel strip.
[Welding device 13]
The welding device 13 according to the present embodiment is for welding the preceding steel strip 11 and the subsequent steel strip 12 and includes a shearing device (not shown), a welding machine (not shown), and a puncher device 19. The

The shearing device is a known shearing device for cutting the rear end portion of the preceding steel strip 11 and the front end portion of the succeeding steel strip 12.
The welder is a flash butt welder or a laser welder. As the laser welding machine, a carbon dioxide gas laser, a YAG laser, or a fiber laser composed of a plurality of fiber crystals in which oscillation media are arranged in parallel can be used.

  The fiber laser welding machine includes an oscillator composed of a plurality of oscillation media composed of a plurality of fiber crystals arranged in parallel, and a laser beam oscillated from the oscillator is transmitted by an optical fiber. Then, the light is condensed by the optical system and irradiated to the butt portion, and welding is performed, so that high-power and high-efficiency welding is possible. That is, generally for joining of coils on the inlet side of a continuous pickling line for pickling a hot-rolled steel strip or a continuous pickling cold rolling line for continuously pickling and cold rolling, Flash butt welding or laser welding is adopted. Select which type of welder to use depending on the thickness of steel strip to be processed, steel type, cycle time, etc., but depending on the line, it is applicable to flash butt welders with superior cycle time, as well as multiple steel types and thin plate materials. The laser welding machine that can be used is installed together, and it is also used depending on the steel strip to be processed.

  However, recently, the advantages of flash butt welders in terms of cycle time have been almost eliminated due to the increase in output of laser power, and laser welders applicable to multiple steel types are becoming mainstream. Further, the laser welding that has been adopted in the conventional hot-rolled steel strip processing line was a carbon dioxide gas laser, but a laser that is adopted in accordance with the increase in the output of a laser capable of fiber transmission has been selected. Among them, fiber lasers are attracting attention as devices capable of increasing output in recent years. In addition, the conventional carbon dioxide laser needs to reflect the linear optical path several times, and finally condense and guide the laser beam to the joint, and its optical axis adjustment is very complicated, and the installation location of the apparatus However, since the fiber transmission is possible, these restrictions can be eliminated.

  Further, the puncher device 19 is a known device that includes a die and a punch and can form a punch hole for detecting a joint by a detection device disposed downstream of the welding device 31. In addition, the black triangle mark in FIG. 1 shows a detector.

  In the present embodiment, the traveling of the preceding steel strip 11 and the following steel strip 12 is stopped in order to cut and remove the rear end portion of the preceding steel strip 11 and the leading end portion of the following steel strip 12 by the welding device 13. It is possible to make a punch hole for detecting a welded portion of the preceding steel strip 11 and the succeeding steel strip 12 until the welding is completed and the preceding steel strip 11 and the following steel strip 12 start running. Since the welding device 13 is provided with the puncher device 19 that is not required to form the notch by the notch device 14, it is not necessary to stop the steel strip to form the notch by the notch device 14. The side cycle time is shortened and the production efficiency is further improved.

FIG. 9B is an explanatory diagram showing a punch hole forming procedure by the puncher device 19 in the present embodiment.
As shown in the figure, in the welding apparatus 13, while the traveling of the steel strip is stopped, the rear end portion of the preceding steel strip 11 and the front end portion of the subsequent steel strip 12 are cut by a shearing device, and a die and a punch are used. A punch hole is formed in the vicinity of the cutting portion of the preceding steel strip 11 or the trailing steel strip 12, and then the leading steel strip 11 and the trailing steel strip 12 are abutted, and the abutting portion is flushed. A welded steel strip is formed by welding with a butt welder or a laser welder, and the welding steel strip starts running after this welding is completed. Punch holes can be formed by the puncher device 19 until the completion of welding. As a result, when it is not necessary to form the notch by the notch device 14, the steel strip is stopped for the formation of the notch by the notch device 14. It becomes unnecessary to do. The welding device 31 of the present embodiment includes the puncher device 19 and forms punch holes during the welding process. Unlike this, however, the welding device 31 is close to the notch device 14, for example, downstream of the welding device 31. Then, the puncher device 19 may be arranged to form punch holes in the welded steel strip after welding is completed.

  Furthermore, it is desirable that the welding apparatus 13 includes a heating unit that heats the butt portion of the preceding steel strip 11 and the subsequent steel strip 12. If water such as cleaning water remains at the butt part, water vapor generated by laser irradiation during welding causes welding defects such as underfill and blowholes, resulting in a decrease in joint strength without forming a sound weld. Therefore, the leading steel strip 11 and the trailing steel strip 12 may be broken at the weld. For this reason, the butt part wetted by the cleaning device is heated by this heating means, and the moisture on the steel strip surface is evaporated and dried before the laser welding torch passes, thereby suppressing the occurrence of welding defects. Thus, a sound joint can be reliably formed, and the welded portion can be prevented from being broken in the cold rolling process.

The heating means is preferably an induction heating method, and the surface temperature of the steel strip is preferably heated to 200 ° C. or more × 1.0 second or more.
[Notch device 14]
The notch device 14 includes a die and a punch, and is a known notch device that forms a notch at an end portion including a joint portion of a stopped welded steel strip.
[Pickling tank 15]
The pickling tank 15 is a known device for supplying an acid solution to the welded steel strip by continuously passing the welded steel strip and removing scale on the surface.

In addition, the code | symbol 26 in FIG. 1 shows a tension leveler, and the code | symbol 27 shows a rinse tank. Reference numeral 18a denotes an entry-side looper disposed on the entry side of the pickling tank 15, reference numeral 18b denotes an intermediate looper disposed between the pickling tank 15 and a side trimmer 17 to be described later. Reference numeral 18c denotes a pre-mill looper disposed on the entry side of the cold rolling mill 16 described later.
[Side trimmer 17]
The side trimmer 17 includes a rotary blade, and changes the plate width of the steel strip by cutting the widthwise end of the pickled steel strip that is in the running state between the pickling tank 15 and the cold rolling mill 16. It is a known run-to-run change trimmer that can do.
[Cold rolling mill 16]
The cold rolling mill 16 is a known rolling mill that rolls a pickled welded steel strip.
[Steel strip winder 25]
The steel strip winding device 25 is a device for winding the cold-rolled steel strip around a coil.
[Driving pattern determination means]
The operation pattern determining means forms a notch at the end portion in the width direction including the coil joint (joint portion) of the welded steel strip joined by the welding device 13 by either the notch device 14 or the side trimmer 17, and the notch Is a device for determining the use of the apparatus for forming the steel sheet according to the sheet width condition of the preceding steel strip 11 and the succeeding steel strip 12 and the information on the presence or absence of trimming work in the running trimmer 17.

  FIG. 3 is a flowchart showing the contents of determination in the operation pattern determination means. As shown in the figure, the notch device 14 is used in the process control 32 based on the difference in sheet width between the preceding steel strip 11 and the subsequent steel strip 12 output from the vidicon 31 and the presence / absence of trimming work in the side trimmer 17. Whether or not a notch is formed is determined, and a notch device operation pattern, a side trimmer device operation pattern, and a line operation pattern are determined based on the determination result.

  Then, the determined notch device operation pattern, side trimmer device operation pattern, and line operation pattern are output to the notch control device 33, the line operation control device 34, and the trimmer control device 35, respectively.

  For example, when the trimming operation is not performed by the side trimmer 17 in both the preceding steel strip 11 and the subsequent steel strip 12, the notch cannot be formed by the side trimmer 17, so the notch needs to be formed by the notch device 14. As shown in (1) to (3) of FIG. 8B described above, the notch device 14 forms a notch at the end in the width direction including the joining portion of the steel strip.

  On the contrary, when the trimming operation is performed by the side trimmer 17 for both the preceding steel strip 11 and the succeeding steel strip 12, the notch can be formed by the side trimmer 17, so the notch is formed by the notch device 14. This eliminates the need for stopping the travel for forming the notch in the notch device 14.

  That is, when the trimming operation is performed by the side trimmer 17 and the notch can be formed by the side trimmer 17, for example, (a) the difference in plate width between the preceding steel strip 11 and the following steel strip 12 is relatively small. And when both the preceding steel strip 11 and the succeeding steel strip 12 are trimmed by the side trimmer 17, or (b) the plate width difference between the preceding steel strip 11 and the following steel strip 12 is relatively small, and When the preceding steel strip 11 is trimmed by the side trimmer 17 and the trailing steel strip 12 is not trimmed by the side trimmer 17, it is not necessary to form the notch by the notch device 14. The entry-side cycle time can be shortened, and the production efficiency of the continuous pickling and cold rolling facility 10 is improved.

  (C) (1) to (3) in FIG. 8 (c) are notched 6 ′ by the side trimmer 17 without using the notch device 14 in the case shown in (1) to (3) of FIG. It is explanatory drawing which shows typically the state which formed.

  In FIG. 1, the welded steel strip to which the preceding steel strip 11 and the subsequent steel strip 12 are connected reaches the side trimmer 17 from the entrance looper 18a via the intermediate looper 18b. The side trimmer 17 changes the plate width by trimming its end while moving the welded steel strip according to the plate width specifications of the preceding steel strip 11 and the following steel strip 12. At this time, as shown in (1) to (3) of FIG. 8 (c), the plate width is changed by forming a gentle notch 6 ′ by cutting the end of the steel strip including the joint 4. To do. By forming the notch 6 ′ with the side trimmer 17 in this way, it is possible to generate a shape failure due to plate breakage or a sudden load change that occurs during cold rolling, or to perform cold rolling. It becomes possible.

  Even if it is determined that the plate width is changed by the side trimmer 17, if the difference between the plate widths of the preceding steel strip 11 and the subsequent steel strip 12 is large, the plate width of the subsequent steel strip 12 is particularly large. Is wider than the plate width of the preceding steel strip 11, the end of the joining portion at the tip of the subsequent steel strip 12 may be bent when passing through the pickling tank 15. It is desirable to form a notch. Specifically, when the width of the trailing steel strip 12 is larger than the preceding steel strip 11 by, for example, 100 mm or more, a notch is formed by the notch device 14 instead of the side trimmer 17, and then the plate width is changed by the side trimmer 17. It is desirable to form the notch 6 ′ while performing the above. With the notch 6 ′ thus formed, the cold rolling mill 16 can perform stable cold rolling while suppressing a rapid load change.

  In the above description, the case where the steel strip dispensing apparatus 20 is configured by one entry-side dispensing reel is taken as an example. However, the present invention is not limited to this, and as shown in FIG. You may comprise by the basic entrance side payout reel. Thereby, the entry-side cycle time can be further shortened.

Fig.5 (a)-FIG.5 (c) are graphs which show the speed of the steel strip sent to the entrance side looper 20 from an entrance side equipment with time passage.
FIG. 5A shows the difference in plate width between the preceding steel strip 11 and the succeeding steel strip 12 and the trimming operation by the side trimmer 17 when the puncher device 19 and the notch device 14 are provided downstream of the welding device 13. The speed pattern of the steel strip in the entry side equipment when it is determined that notch formation by the notch device 14 is necessary based on presence / absence information is shown. On the other hand, FIG. 5B shows a case where the puncher device 19 and the notch device 14 are provided downstream of the welding device 13, and the plate width difference between the preceding steel strip 11 and the trailing steel strip 12 and the trimming by the side trimmer 17. The speed pattern of the steel strip in the entry side equipment when it is determined that the notch is formed by the side trimmer 17 and the notch formation by the notch device 14 is unnecessary based on the information on the presence or absence of work.

  In the case shown in FIG. 5 (b), the notch formation time in the notch device 14 shown in (iv) ′ in FIG. 5 (a) becomes unnecessary, and therefore the operation of the puncher device 19 shown in (iv) is performed. When completed, the steel strip can be started to travel, and the entry-side cycle time can be shortened accordingly.

  In the case shown in FIG. 5 (c), as shown in FIG. 1, when the notch device 14 is provided downstream of the welding device 13 provided with the puncher device 19, the preceding steel strip 11 and the subsequent steel strip 12 are provided. The speed pattern of the steel strip in the entry side equipment when it is determined that the formation of the notch by the notch device 14 is unnecessary based on the difference between the sheet width and the trimming operation by the side trimmer 17. . In this case, since a punch hole is formed from the step of cutting and removing the rear end of the preceding steel strip 11 and the front end of the subsequent steel strip 12 with the welding machine 13 until these weldings are completed, Since it is not necessary to stop the steel strip for forming punch holes and forming notches in the notch device 14, the entry-side cycle time is greatly reduced.

  Although not shown in the figure, when it is determined that the notch formation by the notch device 14 is necessary in the equipment shown in FIG. 1, the steel strip is transferred to the notch device 14 after the welding shown in (ii) in FIG. And the notch is formed by the notch device 14.

  6 (a) to 6 (c) are graphs showing the speed of the steel strip sent from the entry side equipment to the entry side looper over time when two delivery reels are installed. Conditions other than the two are the same as those shown in FIGS. 5 (a) to 5 (c).

  As can be understood from comparing the graphs shown in FIGS. 6A to 6C with the graphs shown in FIGS. 5A to 5C, by arranging two delivery reels. It is possible to further shorten the entry-side cycle time.

  Thus, according to the present embodiment, continuous pickling is achieved by reducing the entry-side cycle time of the continuous pickling and cold rolling equipment for pickling and cold rolling the hot-rolled steel strip. The production efficiency can be improved without increasing the equipment cost of the cold rolling equipment.

Furthermore, the present invention will be described more specifically with reference to examples.
Using the continuous pickling and cold rolling facility 10 shown in FIG. 1, as shown in FIG. 3 and FIG. 9 (b), the plate width difference between the preceding steel strip 11 and the trailing steel strip 12, and the side trimmer 17 On the basis of the information of the vidicon 31 indicating whether or not the trimming operation is necessary, whether or not a notch is formed by the notch device 14 is determined by the pro-computer 32. The simulation calculation of the present invention in which notches are formed by 17 was performed, and the effect was verified.

  As a comparative example, continuous pickling and cold rolling, which is configured in the same manner as the continuous pickling and cold rolling facility 10 shown in FIG. 4 except that the puncher device 19 and the notch device 14 are arranged downstream of the welding machine 13. Using the equipment, a simulation calculation was performed on the premise that notches were formed by the notch device 14 for all joints.

  In this simulation, a steel strip having an average plate thickness of 4.1 mm and an average plate width of 1155 mm was used, the average coil unit weight was 21.2 tons, and the trimming work ratio in the side trimmer 17 was 55%.

  As a result, the production efficiency of the continuous pickling and cold rolling equipment of the example of the present invention was improved by about 8% compared to the production efficiency of the continuous pickling and cold rolling equipment of the comparative example. It has also been found that the efficiency improvement effect increases as the trimming work ratio increases.

Drawing 1 is an explanatory view showing typically the composition of the continuous pickling cold rolling equipment of an embodiment. FIG. 2 is an explanatory view showing a steel strip dispensing device arranged upstream of the welding device. FIG. 3 is a flowchart showing the contents of determination by the operation pattern determining means. FIG. 4 is an explanatory view schematically showing a configuration of a continuous pickling and cold rolling facility having a steel strip dispensing device constituted by two entry-side dispensing reels. Fig.5 (a)-FIG.5 (c) are graphs which show the speed of the steel strip sent to an entrance side looper from entrance side equipment with time passage. 6 (a) to 6 (c) are graphs showing the speed of the steel strip fed from the entry side equipment to the entry side looper with the passage of time when two payout reels are installed. FIG. 7 is an explanatory view showing the vicinity of a joint portion of a welded steel strip obtained by welding a preceding steel strip and a subsequent steel strip with a welding machine. Fig.8 (a) is explanatory drawing which shows the various joining condition of a preceding steel strip and a succeeding steel strip, FIG.8 (b) is explanatory drawing which shows the condition which formed the notch with the notch device. FIG.8 (c) is explanatory drawing which shows the condition which formed the notch with the side trimmer. Fig.9 (a) is explanatory drawing which shows the formation procedure of the punch hole and notch to a welded steel strip, FIG.9 (b) is description which shows the formation procedure of the punch hole by the puncher apparatus in this Embodiment. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Leading steel strip 2 Subsequent steel strip 3 Welding steel strip 4 Joint part 5 Punch hole 6, 6 'Notch 10 Continuous type pickling cold rolling equipment 13 Welding device 14 Notch device 15 Pickling tank 16 Cold rolling mill 17 Side trimmer 18a Entrance looper 18b Intermediate looper 18c Looper 19 in front of mill 19 Puncher device 20 Steel strip dispensing device 20a Hot rolled steel strip 20b Pressure roll 21 Washing water 22 Deflector roll 23 Leveler 24 Ringer roll 25 Steel strip take-up device 26 Tension leveler 27 Rinse tank 31 Bizcon 32 Procon 33 Notch control device 34 Line operation control device 35 Trimmer control device

Claims (7)

A welding device that abuts the preceding steel strip and the succeeding steel strip from upstream to downstream, welds the butted portion to obtain a welded steel strip having a joint, and pickles the pickled steel by pickling the welded steel strip A pickling tank for obtaining a strip, and a continuous pickling and cold rolling facility in which a cold rolling machine for cold rolling the pickled steel strip is directly connected,
A notch device that forms a notch in an end in the width direction including the joint of the welded steel strip, and a side trimmer device that can change the plate width of the pickled steel strip while running the pickled steel strip Are disposed between the welding apparatus and the pickling tank, and between the pickling tank and the cold rolling mill, respectively, and a difference in plate width between the preceding steel strip and the following steel strip And whether or not the notch device needs to be formed based on the information on the presence or absence of the trimming operation in the side trimmer device, and based on the determination result, the notch device and the side trimmer device. A continuous pickling and cold rolling facility comprising: an operation pattern determining means for determining each operation pattern.   The punch hole for detecting the position of the joint is between the rear end of the preceding steel strip and the front end of the subsequent steel strip being stopped by the welding apparatus until the welding is completed. The continuous pickling and cold rolling facility according to claim 1, further comprising a puncher device that can be formed.   The continuous pickling cold rolling facility according to claim 1 or 2, wherein the welding apparatus includes a fiber laser welding machine including an oscillation medium composed of a fiber crystal that oscillates a laser beam.   The continuous pickling and cold rolling facility according to any one of claims 1 to 3, wherein the welding apparatus includes a heating unit that heats the butt portion.   The continuous pickling and cold rolling facility according to any one of claims 1 to 4, wherein the steel strip dispensing device disposed upstream of the welding device has a cleaning means for cleaning the surface of the steel strip. Cutting the rear end of the preceding steel strip and the front end of the succeeding steel strip, butting the preceding steel strip and the succeeding steel strip after cutting, welding the butted portion by laser welding A welding step for obtaining a steel strip, an acid tip step for pickling the welded steel strip to obtain a pickled steel strip, a cold rolling step for cold rolling the pickled steel strip to obtain a cold rolled material, and A method of manufacturing a cold-rolled material comprising:
A first step of forming a notch in an end portion in the width direction including the joint portion of the welded steel strip between the welding step and the pickling step, and the pickling step and the cold rolling step And a second step of forming a notch in the end in the width direction including the joint of the pickled steel strip,
Based on the difference in sheet width between the preceding steel strip and the succeeding steel strip, and information on the presence or absence of trimming work between the pickling step and the cold rolling step, the first step, the second step Or a combination of the first step and the second step. A method for producing a cold rolled material, comprising:   The manufacturing method of the cold-rolled material of Claim 6 which forms the punch hole for detecting the said junction part in the said preceding steel strip or the said succeeding steel strip at the said welding process.

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