JP4864173B2 - Cold rolled material manufacturing equipment and cold rolling method - Google Patents

Description

  The present invention relates to a cold rolled material manufacturing facility and a cold rolling method.

  As a rolling facility for producing a cold rolled material with a small amount of about 300,000 tons per year and a large number of steel types, one cold rolling mill and winding a strip on each of the inlet and outlet sides of the cold rolling mill A strip winding / unwinding device also used for unwinding is arranged, and the strip is reversibly rolled between the inlet side and the outlet side winding / unwinding device of the cold rolling mill until a desired plate thickness is obtained. Reversible cold rolling equipment for rolling (hereinafter referred to as RCM equipment) has been put into practical use.

  Furthermore, there is a facility (hereinafter referred to as a two-stand reverse facility) equipped with two rolling mills in an attempt to increase the annual production amount of the RCM facility from about 500,000 tons to about 600,000 tons (Patent Document 1). reference).

  In such an RCM facility, in order to avoid strip warpage in the first pass and the second pass of rolling, the end of the strip is passed through unrolled, and also in the pass after the third pass, the path switching unit Then, the front pass rolling part must be left unrolled. For this reason, there is a problem that the unrolled portion of the strip front end and the tail end is out of the product thickness range and cannot be sold as a product. Strips outside these product thicknesses are called off-gauges. The off-gauge ratio is defined as the off-gauge rate as the ratio of the off-gauge amount to the total production. The off-gauge rate in each rolling equipment is about 2.5% for the RCM equipment and about 6.0% for the 2-stand reverse equipment. On the other hand, the off-gauge rate of the PL-TCM facility in which the pickling process and the cold tandem rolling process are continued is only about 0.2%. In reversible rolling equipment, compared to PL-TCM equipment, the off-gauge rate is about 2.5% to 6.0%, which is very high.

  In particular, the two-stand reverse facility described in Patent Document 1 generates about 6.0% off-gauge, significantly lowers the yield, and greatly increases the manufacturing cost.

  Further, in the reversible rolling method, the rolling mill is decelerated and rolling is stopped when approaching the coil tail end in the previous pass. In the next pass, a new acceleration is performed to roll in the reverse direction of the previous pass. As described above, in the reversible rolling method, acceleration / deceleration and rolling stop are repeated by the number of passes until the desired product sheet thickness is reached, so that the actual rolling time in the operation time is short and the production efficiency is poor.

  In order to solve these problems, a cold rolling mill, a coil build-up line that joins multiple coils to form a long single coil, and a built-up long coil (build-up coil) are reversible a predetermined number of times. A cold rolling facility has been proposed that has a reversible rolling line that performs rolling and divides it into coil lengths that can be conveyed in the final pass (see Patent Document 2). In this cold rolling equipment, the strip length of the build-up coil can be increased by an amount equivalent to the total length of the strips of the joined coils, and the unrolled portion of the coil leading end is the innermost circumference of the built-up coil. Since this occurs only in the outermost part and the outermost peripheral part, the off-gauge rate can be significantly reduced. Further, since the number of acceleration / decelerations at the coil tail end can be reduced by the number of joined coils, the production efficiency is improved.

Japanese Patent No. 3322984 Japanese Patent Publication No.57-039844

  The prior art described in Patent Document 2 solves the problems of the prior art described in Patent Document 1 and enables high efficiency and high yield, but has the following problems.

  The first problem is related to the complexity of the configuration and the size of the apparatus.

  The prior art described in Patent Document 2 is to build up a plurality of coils to form a buildup coil, and then to roll the buildup coil, and to wind up the buildup coil for forming the buildup coil An unwinding device is required, and the number of winding and unwinding devices is increased as compared with the prior art described in Patent Document 1.

  The prior art described in Patent Document 2 builds up a plurality of coils to form a build-up coil having a large diameter. When rolling a build-up coil having an increased diameter, the outer diameter of the coil increases, and the coil winding force that tends to shrink toward the inner diameter side of the coil increases due to the rolling tension acting on the coil. For this reason, when a collapsible reel having a variable diameter is applied to the winding / unwinding device, it is difficult to give the reel the strength to maintain the winding force. That is, it is difficult to apply the collaps reel to the winding / unwinding device, and in order to avoid this problem, it is necessary to apply a solid block reel whose diameter is not variable. On the other hand, when the build-up coil after rolling is divided and the coil is extracted and taken out, the solid block type reel cannot shrink the diameter and the coil cannot be extracted. Is required. Thus, the prior art described in Patent Document 2 requires a winding / unwinding device for a solid block type reel during rolling, and a winding device for a collaps type reel during unloading. The number of unwinding devices increases. Such a complicated structure increases initial costs.

  For a relatively large-scale production facility with an annual production volume of 800,000 tons or more, the advantages of lower off-gauge rate and higher production efficiency exceed the demerits of increased initial costs, and there is no problem even if the initial costs increase somewhat. However, in the case of a small- to medium-sized production facility with an annual production amount of about 300,000 tons to 600,000 tons, the problem of the initial cost becomes remarkable, and there is a problem in terms of cost effectiveness.

  In general, joining apparatuses applied to cold rolling applications are a laser beam welding machine and a flash butt welding machine, which are butt joining methods. These welding machines can ensure high butt accuracy, but on the other hand, the use of a large number of high-rigidity and high-precision parts makes the equipment large and expensive compared to other joining methods. When these welding machines are applied to large-scale production facilities that exceed 1 million tons per year, such as PL-TCM, the ratio of welding machine costs to the overall capital investment costs is relatively low, which is a serious problem. However, when it is applied to small- to medium-scale facilities with an annual production amount of about 300,000 tons to about 600,000 tons, the ratio becomes large, which is problematic in terms of cost effectiveness and difficult to apply.

  Secondly, there is a problem related to the joint of the buildup coil.

  In build-up coil formation, it is ideal that there is no change in the thickness of the build-up coil, but in reality the plate thickness of the preceding coil and the thickness of the subsequent coil may differ slightly due to manufacturing errors, etc. There is a step in When tension is applied to the coil with the joint with a steep step located on the inner layer of the build-up coil, the step of the joint is transferred to the inside and outside of each layer, resulting in product defects that are handled as wrinkles. there were.

  Moreover, when joining by the seam welding of a superimposition system, the level | step difference produced in the junction part and there existed the subject which causes a product defect similarly.

  Third, there is a problem related to the lengthening of the coil.

  The prior art described in Patent Document 2 forms a buildup coil, and the buildup coil becomes longer. When the coil becomes longer, the torque required for the reel is increased in a form that is linearly proportional to the outer diameter of the coil in order to apply the tension necessary for rolling with the reel, and the reel drive device becomes larger. was there.

  Fourth, there is a problem related to coil division.

  Further, Patent Document 2 proposes a cold rolling facility that divides the coil into sizes that can be conveyed in the final pass. In this equipment, when there is one winding device that winds up the divided coil, the rolling speed when dividing is 0 mpm. When the rolling speed reaches 0 mpm, the rolling stops, so that the stop coefficient can be generated by changing the coefficient of friction between the work roll and the strip on the surface of the strip sandwiched between the work rolls. Therefore, stop marks may be transferred to the strip surface at regular intervals at the rotation pitch of the work roll during subsequent rolling. When this stop mark occurs in the first pass, the stop mark may become inconspicuous to a level that cannot be visually observed by continuing rolling a plurality of times. However, when it occurs in the final pass, the quality of the surface gloss is impaired, and a material with strict quality has a problem of becoming a defective product.

  An object of the present invention is to provide a cold rolled material that maintains high efficiency and high yield and is highly cost effective in a small to medium-sized production facility with an annual production of about 300,000 to 600,000 tons. It is to provide equipment and cold rolling method.

  The reversible cold rolling method according to the first invention for solving the first problem described above includes a winding device for unwinding a coil, at least one reversible cold rolling mill, and the cold rolling mill. First and second winding / unwinding devices respectively disposed on the entry side and the exit side of the first path, and a joining device disposed between the unwinding device and the first winding / unwinding device. In the reversible cold rolling method in which a plurality of passes of cold rolling is performed by changing the rolling direction, the first coil strip unwound from the unwinding device is directly guided to the cold rolling mill and rolled. And a rolling step of winding around the second winding / unwinding device, and a second step of continuing unwinding from the first coil tail end and the unwinding device when the first coil tail end reaches the joining device. A joining step for joining the coil tips, and a subsequent second coil, and the rolling step. The first pass rolling by the cold rolling mill and the joining of the leading coil tail end and the trailing coil tip by the joining device to build up a plurality of coils into one coil. A one-pass coil build-up rolling process, a reversible rolling process in which the built-up coil is subjected to reversible rolling a predetermined number of times until a desired product thickness is obtained, and the build-up in the final pass of the reversible rolling process. And a coiling process in which the coil is cut by a cutting device and wound around one of the first and second winding / unwinding devices to form a plurality of coils.

  By the way, when building up a plurality of coils into one coil, it is necessary to stop rolling during joining. When the rolling is stopped, that is, when the rolling speed is 0 mpm, the friction coefficient between the work roll and the strip changes on the surface of the strip sandwiched between the work rolls, thereby generating a stop mark. Furthermore, since the stop mark is also transferred to the work roll, the stop mark may be transferred to the surface of the strip at regular intervals at the rotation pitch of the work roll during subsequent rolling. When this stop mark is generated in the first pass, the stop mark may not be noticeable to a level that cannot be visually observed by continuing rolling a plurality of times. However, when a high quality surface gloss is strictly required, a new problem of being treated as a defective product arises.

  The reversible cold rolling method according to the second aspect of the present invention for solving the above-mentioned newly occurring problem is the reversible cold rolling method according to the first aspect of the invention, in which the strip is stored between the cold rolling mill and the joining device. An apparatus is provided, and the rolling speed during joining of the leading coil tail end and the trailing coil tip in the joining step is more than 0 mpm and 50 mpm or less.

  The reversible cold rolling method according to the third invention for solving the above-mentioned fourth problem is the reversible cold rolling method according to any one of the first invention to the second invention, wherein the split winding is performed. In the process, the rolling speed at the time of dividing the coil in the final pass is more than 0 mpm and 50 mpm or less.

  On the other hand, when the rolling speed at the time of joining and the rolling speed at the time of dividing the coil in the final pass are reduced to more than 0 mpm and 50 mpm or less, a new problem arises that the plate thickness control accuracy is lowered. That is, the thickness gauge used for thickness control is installed at a distance away from the work roll of the rolling mill, and when the rolling speed is reduced, feedback control of the thickness is performed with the measured value of the thickness gauge. Due to the time delay, the plate thickness control accuracy decreases.

  The reversible cold rolling method according to a fourth aspect of the present invention for solving the above-mentioned newly occurring problem is the reversible cold rolling method according to the first to third aspects of the invention, in the joining step, the cold cooling method. The inlet side rolling speed and inlet side sheet thickness and outlet side rolling speed of the cold rolling mill are measured, and based on these measured values, the thickness of the cold rolling mill immediately under the work roll is calculated, and the cold rolling mill has It is characterized in that the plate thickness is controlled so as to obtain a desired plate thickness by a hydraulic pressure reducing device.

  Similarly, when the rolling speed at the time of joining and the rolling speed at the time of dividing the coil in the final pass are reduced to more than 0 mpm and 50 mpm or less, a new problem that the shape control accuracy is reduced occurs. In other words, the shape detector for measuring the shape of the strip is also arranged at a position away from the work roll of the rolling mill in the same manner as the thickness gauge, so when the rolling speed is reduced, the shape detector is used. It takes time to recognize the shape and correct the shape by the actuator, and the shape control accuracy decreases. In general, when the rolling speed is reduced, the coefficient of friction between the work roll and the strip increases, resulting in an increase in rolling load and disorder of the shape.

  The reversible cold rolling method according to a fifth aspect of the present invention for solving the above-mentioned newly occurring problem is the reversible cold rolling method according to any one of the first to fourth aspects of the invention, wherein the joining step In the coil cutting and winding step, the strip shape is controlled by roll bender control or coolant control or both of these controls based on the roll deflection calculation result due to the change in rolling load of the cold rolling mill.

  The reversible cold rolling method according to the sixth invention for solving the second problem described above is the reversible cold rolling method according to any one of the first invention to the fifth invention, wherein the rolling step Before, the order of the coils carried into the unwinding device is adjusted in advance so that the absolute value of the plate thickness difference between the preceding coil and the succeeding coil is 1 mm or less.

  The reversible cold rolling method according to the seventh invention for solving the first problem described above is the reversible cold rolling method according to any one of the first to sixth inventions, wherein the joining step includes The joining device is joined by using a joining device of a mash seam welding system.

  On the other hand, when a mash seam welding type joining device is used, a new problem relating to the joint occurs. That is, the mash seam welding machine employs a method in which materials to be joined are sandwiched between overlapping electrode wheels and energized to generate heat in the contact resistance and internal resistance of the materials and join them. Thereby, the plate | board thickness of the junction part after completion | finish of joining increases to about 1.2 to 1.5 times. The thickened joint becomes a step, and an excessive force acts on the roll when passing through a rolling mill. Further, the step may be transferred as a mark to the work roll. That is, a problem similar to the second problem occurs.

  The reversible cold rolling method according to the eighth invention for solving the same problem as the second problem newly generated as described above is the reversible cold rolling according to any one of the first invention to the seventh invention. In the rolling method, a cross swaging process is performed immediately after joining by the mash seam welding type joining device.

A reversible cold rolling method according to a ninth invention for solving the third problem described above is the reversible cold rolling method according to any one of the first to eighth inventions, wherein the coil buildup is performed. In the rolling process, the outer diameter of the coil that has been built up is set to φ3000 mm or less.

  The reversible cold rolling method according to the tenth invention for solving the third problem described above is the reversible cold rolling method according to any one of the first to ninth inventions, wherein the coil outer diameter is The strip tension at the time of the large diameter is compared with the tension of the strip at the small diameter, and is set to be gradually lower.

  The reversible cold rolling method according to an eleventh aspect of the invention is the reversible cold rolling method according to any one of the first to tenth aspects of the invention, in the rolling step and the coil buildup rolling step. It is characterized by rolling using a 2 stand cold rolling mill as a cold rolling mill.

  The reversible cold rolling method according to the twelfth invention for solving the second problem described above is the reversible cold rolling method according to any one of the first invention to the eleventh invention, wherein the split winding is performed. In the process, the coil is cut in the final pass immediately after the joint passes through the cutting device.

  The reversible cold rolling method according to the thirteenth invention for solving the second problem described above is the reversible cold rolling method according to the twelfth invention, wherein the coil is cut at the final pass in the split winding step. Are immediately before the joining portion passes the cutting device and immediately after the joining portion passes the cutting device.

  A reversible cold rolling method according to a fourteenth aspect of the present invention is the reversible cold rolling method according to any one of the first to thirteenth aspects of the present invention, before the rolling of the final pass in the divided winding step. In addition, the work roll is rearranged into a dull weight work roll in a state in which the strip is passed, and the final pass rolling is performed.

  A reversible cold rolling facility according to a fifteenth invention for solving the first problem described above includes an unwinding device for unwinding a coil, at least one reversible cold rolling mill, and the cold rolling mill. First and second winding / unwinding devices respectively disposed on the entry side and the exit side of the first path, and a joining device disposed between the unwinding device and the first winding / unwinding device. In a reversible cold rolling facility that performs cold rolling of multiple passes by changing the rolling direction, the first coil strip unwound from the unwinding device is directly guided to the cold rolling mill and rolled. And when the first coil tail end reaches the joining device, the second coil tip is continuously unwound from the first coil tail end and the unwinding device. And then repeating the rolling and joining after the second coil, The first pass rolling by the rolling mill and the joining of the leading coil tail end and the trailing coil leading edge by the joining device were performed, a plurality of coils were built up into one coil, and the build up was performed in the cold rolling mill The coil is subjected to reversible rolling a predetermined number of times until a desired product thickness is obtained, and the built-up coil is divided by a cutting device in the final pass of reversible rolling, and the first and second windings are unwound. The unwinding device, the cold rolling mill, the first and second unwinding / unwinding devices, the joining device, and the cutting device are controlled so as to be wound around one of the devices to form a plurality of coils. A control device is provided.

  A reversible cold rolling facility according to a sixteenth aspect of the present invention that solves a problem newly generated in association with the first problem described above is the reversible cold rolling facility according to the fifteenth aspect of the present invention. A strip storage device is disposed between the cold rolling mills.

  A reversible cold rolling facility according to a seventeenth aspect of the present invention that solves a problem newly generated in association with the first problem described above is the reversible cold rolling facility according to the fifteenth and sixteenth aspects of the present invention. The strip storage length of the strip storage device is more than 0 m and not more than 100 m.

  A reversible cold rolling facility according to an eighteenth aspect of the present invention that solves a problem newly generated in association with the first problem described above is the reversible cold rolling facility according to any one of the fifteenth and thirteenth aspects of the present invention. In the cold rolling facility, the control device controls the rolling speed of the cold rolling mill during coil joining by the joining device and during coil cutting by the cutting device to be more than 0 mpm and 50 mpm or less. .

  A reversible cold rolling facility according to a nineteenth aspect of the present invention that solves a problem newly generated in association with the first problem described above is the reversible cold rolling facility according to any one of the fifteenth aspect to the eighteenth aspect. In the cold rolling facility, the control device measures the inlet side rolling speed, the inlet side plate thickness, and the outlet side rolling speed of the cold rolling mill during coil joining by the joining device and at the time of coil cutting by the cutting device. Based on these measured values, the thickness of the cold rolling mill is calculated directly below the work roll, and the thickness is controlled by the hydraulic reduction device of the cold rolling mill so as to obtain a desired thickness. And

  A reversible cold rolling facility according to a twentieth aspect of the present invention that solves a problem newly generated in association with the first problem described above is the reversible cold rolling facility according to any one of the fifteenth to nineteenth aspects. In the cold rolling facility, the control device is configured to perform roll bender control or coolant based on a roll deflection calculation result due to a change in rolling load of the cold rolling mill during coil joining by the joining device and at the time of coil division by the cutting device. The strip shape is controlled by the control or both of the controls.

  The reversible cold rolling facility according to the twenty-first invention for solving the third problem described above is the reversible cold rolling facility according to any one of the fifteenth to twentieth inventions, wherein the controller is In the first pass coil build-up rolling and during the subsequent reversible rolling, the tension of the strip when the coil outer diameter is large is set lower than the tension of the strip when the coil outer diameter is small. Features.

  A reversible cold rolling facility according to a twenty-second invention is the reversible cold rolling facility according to any one of the fifteenth to twenty-first inventions, wherein the cold rolling mill has two stands. And

  A reversible cold rolling facility according to a twenty-third invention for solving the second problem described above is the reversible cold rolling facility according to any one of the fifteenth to twenty-second inventions, wherein the joining device is It is a mash seam welder.

  The reversible cold rolling facility according to the twenty-fourth invention for solving the second problem described above is the reversible cold rolling facility according to the twenty-third invention, wherein the mash seam welder of the joining device A swaging roller having a mechanism for inclining the swaging roller axis with respect to a horizontal plane is provided.

  According to the present invention, the following effects can be obtained.

  In the first and fifteenth inventions, by forming a build-up coil in the first pass and performing reversible rolling of the coil that has been built up after the second pass, the joint portion is also smaller than the prior art described in Patent Document 1. Usually, rolling can be performed at a rolling speed, and production efficiency is improved. Moreover, since an unrolled part generate | occur | produces only in the innermost peripheral part and outermost peripheral part of the coil which built up, it becomes possible to reduce an off-gauge rate significantly. Furthermore, the portion of the unsteady rolling speed is reduced and the plate thickness accuracy is improved. That is, it is possible to maintain a high efficiency and a high yield as high as those of the prior art described in Patent Document 2.

  In the first pass, following the rolling of the first coil and the joining of the first coil and the second coil, the rolling and joining after the second coil are repeated, and the first pass rolling by a cold rolling mill. By winding the leading end of the leading coil and the leading end of the succeeding coil by a joining device and building up a plurality of coils into one coil, the winding winding for the buildup coil that is essential in the prior art described in Patent Document 2 A dispensing device is not required. Thereby, the equipment configuration can be simplified, and as a result, the initial cost can be reduced.

  By the way, when building up a plurality of coils into one coil, it is necessary to stop rolling during joining. When the rolling is stopped, that is, when the rolling speed is 0 mpm, the friction coefficient between the work roll and the strip changes on the surface of the strip sandwiched between the work rolls, thereby generating a stop mark. Furthermore, since the stop mark is also transferred to the work roll, the stop mark may be transferred to the surface of the strip at regular intervals at the rotation pitch of the work roll during subsequent rolling. When this stop mark is generated in the first pass, the stop mark may not be noticeable to a level that cannot be visually observed by continuing rolling a plurality of times. However, when a high quality surface gloss is strictly required, a new problem of being treated as a defective product arises.

  In the second and sixteenth, seventeenth, eighteenth and eighteenth inventions, a strip storage device is provided between the cold rolling mill and the joining device, the strip is stored in the strip storage device except during joining, and stored in the strip storage device during joining. By using the formed strip and continuing the rolling even when the leading coil tail end is stopped, it is possible to prevent the stop mark of the work roll from being generated on the strip during the joining operation.

  Furthermore, when the rolling speed during joining of the leading coil tail end and the trailing coil tip exceeds 0 mpm and is 50 mpm or less, for example, if the time required for the joining operation is 2 minutes, the strip storage length is 100 m or less. The length of the strip stored in the strip storage device can be shortened, and the strip storage device can be made compact. As a result, the equipment configuration can be simplified.

  Preferably, the rolling speed is more than 0 mpm and 20 mpm or less, more preferably more than 0 mpm and 10 mpm or less, more preferably more than 0 mpm and 5 mpm or less, so that the strip storage length is 40 m or less, 20 m or less, respectively. The length of the strip stored in the strip storage device can be shortened, and the strip storage device can be made compact. As a result, the equipment configuration can be reduced in size.

  In the third invention, the rolling speed at the time of dividing the coil in the final pass is set to more than 0 mpm and 50 mpm or less, and by applying a collaps reel which will be described later, after the coil is divided, the coil is extracted and carried out. The operation of continuously winding the next coil can be performed by one winding / unwinding device, and the solid block type reel winding / unwinding device and the winding for unloading which are essential in the prior art described in Patent Document 2. No take-up device is required. Thereby, the equipment configuration can be simplified, and as a result, the initial cost can be reduced.

  Preferably, the rolling speed is more than 0 mpm and less than 20 mpm, more preferably more than 0 mpm and less than 10 mpm, more preferably more than 0 mpm and less than 5 mpm, thereby shortening the distance between the cutting device and the winding / unwinding device. The equipment length can be shortened. As a result, the initial investment cost can be suppressed.

  Further, by continuing the rolling even when the coil is divided, it is possible to prevent the work roll stop mark from being generated on the strip during the joining operation.

  On the other hand, when the rolling speed at the time of joining and the rolling speed at the time of dividing the coil in the final pass are reduced to more than 0 mpm and 50 mpm or less, a new problem arises that the plate thickness control accuracy is lowered. That is, the thickness gauge used for thickness control is installed at a distance away from the work roll of the rolling mill, and when the rolling speed is reduced, feedback control of the thickness is performed with the measured value of the thickness gauge. Due to the time delay, the plate thickness control accuracy decreases.

  In order to solve the above new problem, in the fourth and nineteenth inventions, at the time of joining, the inlet side rolling speed, the inlet side plate thickness, and the outlet side rolling speed of the cold rolling mill are measured, and these measurements are performed. Based on the value, the plate thickness just under the work roll of the cold rolling mill is calculated, and the plate thickness control is performed by the hydraulic reduction device of the cold rolling mill so that the desired plate thickness is obtained, so the plate thickness accuracy can be maintained. .

  Similarly, when the rolling speed at the time of joining and the rolling speed at the time of dividing the coil in the final pass are reduced to more than 0 mpm and 50 mpm or less, a new problem that the shape control accuracy is reduced occurs. In other words, the shape detector for measuring the shape of the strip is also arranged at a position away from the work roll of the rolling mill in the same manner as the thickness gauge, so when the rolling speed is reduced, the shape detector is used. It takes time to recognize the shape and correct the shape by the actuator, and the shape control accuracy decreases. In general, when the rolling speed is reduced, the coefficient of friction between the work roll and the strip increases, resulting in an increase in rolling load and disorder of the shape.

  In order to solve the above new problem, in the fifth and twentieth inventions, when the coil is divided at the time of joining and in the final pass, the roll is calculated based on the roll deflection calculation result due to the rolling load fluctuation of the rolling mill. By controlling the strip shape by bender control or coolant control, or both, it is possible to compensate for the detection delay and maintain the strip shape.

  In the sixth invention, the order of coils to be carried into the unwinding device is adjusted in advance so that the absolute value of the plate thickness difference between the preceding coil and the succeeding coil is 1 mm or less, more preferably 0.5 mm or less in advance. By doing so, it is possible to suppress wrinkles from being transferred to the adjacent coil layer at the level difference of the joint portion located in the inner layer portion of the built-up coil.

  In the seventh and twenty-third inventions, by using an inexpensive mash seam welding type joining device, the annual production amount is about 300,000 tons to 600,000 tons. Can solve the problem.

  On the other hand, when a mash seam welding type joining device is used, a new problem relating to the joint occurs. That is, the mash seam welding machine employs a method in which materials to be joined are sandwiched between overlapping electrode wheels and energized to generate heat in the contact resistance and internal resistance of the materials and join them. Thereby, the plate | board thickness of the junction part after completion | finish of joining increases to about 1.2 to 1.5 times. The thickened joint becomes a step, and an excessive force acts on the roll when passing through a rolling mill. Further, the step may be transferred as a mark to the work roll.

  In the eighth and twenty-fourth inventions, the level difference can be smoothed by performing a cross swaging process of inclining the swaging roller and rolling the thickened joint after mash seam welding.

In 9th invention, the coil outer diameter of the buildup coil after joining shall be (phi ) 3000 mm or less, the winding force which acts on a coil is restrict | limited, and winding unwinding by the coil outer diameter becoming large Increase in the size of the apparatus can be suppressed.

  Further, a collapsible reel having an expansion / contraction function can be applied instead of a solid block type reel having no expansion / contraction function, and the number of winding / unwinding devices can be reduced as described above.

  In the tenth and twenty-first aspects of the present invention, the tension of the strip when the outer diameter of the coil is large is compared with the tension of the strip when the outer diameter of the coil is small, and the tension is controlled to be gradually lowered. The tightening force is limited, and an increase in the size of the winding / unwinding device due to an increase in the outer diameter of the coil can be suppressed.

  Further, a collapsible reel can be applied, and the number of winding and unwinding devices can be reduced as will be described later.

  In the eleventh and twenty-second inventions, rolling using a two-stand cold rolling mill makes it possible to reduce the number of rolling passes until a desired plate thickness is obtained, thereby improving production efficiency.

  By the way, although the subject concerning a junction part is solved as mentioned above, a product coil may require the accuracy further.

  In the twelfth aspect of the present invention, the coil can be divided in the final pass immediately after the bonded portion passes through the cutting device, so that the bonded portion can be disposed on the outer surface of the divided coil, and the bonded portion can be easily processed after the coil is extracted. I can do it.

  In the thirteenth invention, the coil is cut in the final pass immediately before the joining portion passes the cutting device and immediately after the joining portion passes the cutting device, so that the joining portion is not wound around the product coil. It is possible to eliminate the need for post-processing.

  In the fourteenth invention, before starting the rolling of the final pass, the work roll is replaced with a dull weight work roll in a state where the strip is passed through, and is performed in a lower process of the cold rolling process in which the final pass is rolled. It is possible to improve the rollability during deep drawing, or the adhesion and clearness of coating.

  As described above, in the production facilities of small to medium scale with annual production of about 300,000 tons to 600,000 tons, it is possible to produce cold rolled material that maintains high efficiency and high yield and is highly cost effective. Equipment and cold rolling methods can be provided.

It is the schematic of the cold-rolled material equipment concerning 1st Embodiment of this invention. It is a control flow which shows the process sequence (1st path | pass) which a control apparatus performs. It is a control flow which shows the process sequence (2nd-3rd path | pass) which a control apparatus performs. It is a control flow which shows the process sequence (4th path | pass) which a control apparatus performs. It is a time table (1st path | pass) of each apparatus. It is a time table (2nd-3rd pass) of each apparatus. It is a time table (4th path | pass) of each apparatus. It is the schematic of the cold-rolled material equipment concerning the 1st prior art used for the comparison. It is the schematic of the cold-rolled material equipment concerning the 2nd prior art used for the comparison. It is a conceptual diagram of a mash seam welding system. It is the schematic of the joining apparatus of a mash seam welding system. It is the schematic of the inclination mechanism provided in the joining apparatus. It is a figure which shows the metal flow of a junction part. It is a figure which shows the 1st setting method of the angle which inclines a pressure roller. It is a figure which shows the 2nd setting method of the angle which inclines a pressure roller. It is a figure which shows tension control at the time of winding up the buildup coil 102. It is the schematic of the cold-rolled material equipment concerning 2nd Embodiment of this invention. It is the schematic of the cold-rolled material equipment concerning 3rd Embodiment of this invention. It is a control flow (1st path | pass) which shows the process sequence which a control apparatus performs. It is the schematic of the cold-rolled material equipment concerning 4th Embodiment of this invention.

-First embodiment-
Next, a first embodiment of the present invention will be described with reference to the drawings. A cold rolled steel sheet will be described as an example of the cold rolled material in the present embodiment.

<Main configuration>
FIG. 1 is a schematic view of cold rolled material equipment according to the first embodiment of the present invention.

  In FIG. 1, the cold rolled material facility according to the present embodiment includes, as main components, a reversible cold rolling mill 1, an unwinding device 2 for unwinding a strip of a carry-in coil 101, and a cold rolling mill 1. Winding / unwinding device 3 (first winding / unwinding device) disposed on the entry side of the first pass and winding / unwinding device 4 disposed on the exit side of the first pass of the cold rolling mill 1. (Second winding / unwinding device), a joining device 5 disposed between the unwinding device 2 and the winding / unwinding device 4 and forming the build-up coil 102 from the plurality of carry-in coils 101, and the final pass Controls the cutting device 6 that divides the strip of the build-up coil 102 to form the carry-out coil 103, the cold rolling mill 1, the unwinding device 2, the winding and unwinding devices 3 and 4, the joining device 5 and the cutting device 6. The control device 20 is provided.

  The reversible cold rolling mill 1 includes, for example, upper and lower work rolls 11 and 11 for directly contacting and rolling a rolled material, upper and lower intermediate rolls 12 and 12 for supporting these work rolls in a vertical direction, and these intermediate rolls. This is a 6-stage UC mill provided with upper and lower reinforcing rolls 13 and 13 for supporting 12 and 12 in the vertical direction.

  A hydraulic reduction device 14 is provided below the lower reinforcement roll 13, and the hydraulic reduction device 14 moves the bearing of the lower reinforcement roll 13 up and down based on a command so that a predetermined reduction amount is obtained. Compress the strip. A load meter 15 is provided on the upper side of the upper reinforcing roll 13, and the roll reduction amount is adjusted in accordance with the load change detected by the load meter 15. This series of operations is called reduction control.

  A thickness gauge 16a, a plate speed meter 17a, and a shape gauge 18a are provided on the entrance side of the first pass of the cold rolling mill 1, and a thickness gauge 16b is provided on the exit side of the first pass of the cold rolling mill 1. A plate speedometer 17b and a shape meter 18b are provided and used for plate thickness control and shape control, and reduction control is performed based on the results of these controls.

  The unwinding device 2 has a collapsible reel having an expansion / contraction function, sets the carry-in coil 101, and unwinds the strip.

  The winding / unwinding device 3 and the winding / unwinding device 4 both have a collaps type reel having an expansion / contraction function, and between the winding / unwinding device 3 and the winding / unwinding device 4, By repeating unwinding, the rolling direction is changed to perform cold rolling of a plurality of passes.

  The joining device 5 joins the strip tail end of the first carry-in coil 101a that has already been unwound and the strip tip end of the second carry-in coil 101b that has been unwound from the unwinding device 2, and subsequently the second The build-up coil 102 is formed by joining the strip tail end of the carry-in coil 101b and the strip tip of the third carry-in coil 101c.

  The cutting device 6 a is disposed between the cold rolling mill 1 and the winding / unwinding device 3, and divides the strip of the buildup coil 102 in a path in which the final pass is completed by the winding / unwinding device 3. Further, the cutting device 6b is disposed between the cold rolling mill 1 and the winding / unwinding device 4 and divides the strip of the buildup coil 102 in a path in which the winding / unwinding device 4 completes winding.

<Main control>
2 to 4 are control flows showing a processing procedure performed by the control device 20. A dotted line shows the relationship between each apparatus 1-6. The control in the case where the build-up coil 102 is formed from the three carry-in coils 101 and four-pass rolling is described. 5 to 7 are time tables of the respective devices 1 to 6 corresponding to the control flow, and the same step numbers are given to the portions corresponding to the processing steps of the control flow.

  The main control in the first pass will be described with reference to FIG.

  The control device 20 controls the cold rolling mill 1 as follows. When the first carry-in coil 101a is carried in and attached to the unwinding device 2 and the strip is fed out, the strip of the first carry-in coil 101a is passed through (S1101) and further fed out to the winding / unwinding device 4. When the end of the strip of the first carry-in coil 101a is gripped by the winding / unwinding device 4, the cold rolling mill 1 is controlled to be reduced (S1102). When the preparation for rolling is thus completed, the rolling speed is accelerated to the steady rolling speed, and rolling is performed at the steady rolling speed (S1103). Here, the steady rolling speed is the maximum speed at which the ability of the cold rolling mill can be exhibited to the maximum when a desired plate thickness is obtained in each pass. The steady rolling speed in cold reversible rolling equipment is generally in the range of 400 mpm to 1400 mpm.

  The cold rolling mill 1 decelerates and stops rolling in accordance with the procedure in which the strip tail end of the first carry-in coil 101a is unwound from the unwinding device 2 and the second carry-in coil 101b is carried into the unwinding device 2. (S1104). When the first carry-in coil 101a and the second carry-in coil 101b are joined, the roll is accelerated again to the steady rolling speed, and the cold rolling mill 1 performs rolling at the steady rolling speed on the unrolled strip of the first carry-in coil 101a. (S1105) Subsequently, the joined second carry-in coil 101b is rolled at a steady rolling speed (S1106). In accordance with the procedure in which the second carry-in coil 101b is unwound from the unwinding device 2 and the third carry-in coil 101c is carried into the unwinding device 2, the cold rolling mill 1 decelerates and stops rolling (S1107). When the 2nd carrying-in coil 101b and the 3rd carrying-in coil 101c are joined, it will accelerate to a steady rolling speed again, and the cold rolling mill 1 will roll at the steady rolling speed about the unrolled part of the 2nd carrying-in coil 101b. (S1108) Subsequently, the joined third carry-in coil 101c is rolled at a steady rolling speed (S1109). When the strip tail end of the third carry-in coil 101c is unwound from the unwinding device 2 and sent out, the cold rolling mill 1 decelerates, and the strip tail end of the third carry-in coil 101c is immediately before the cold rolling mill 1. When it comes, the cold rolling mill 1 stops rolling (S1110) and ends the rolling of the first pass (S1111).

  The control device 20 controls the unwinding device 2 as follows. When the first carry-in coil 101a is carried in and mounted (S1201), the unwinding device 2 unwinds the strip of the first carry-in coil 101a at the plate speed (S1202), and the strip of the first carry-in coil 101a is cold rolled. When the sheet is passed through 1 and gripped by the winding / unwinding device 4, the unwinding device 2 winds the strip of the first carry-in coil 101a in accordance with the rolling speed of the cold rolling mill 1 that performs rolling at a steady rolling speed. (S1203). Here, the sheet passing speed is generally a speed of 30 mpm or less. When the unwinding device 2 unwinds the tail end of the first carry-in coil 101a and carries in and mounts the second carry-in coil 101b (S1204), the strip of the second carry-in coil 101b is wound up to the joining device 5 at the plate speed. When the strip end of the second carry-in coil 101b is fed to the joining position of the joining device 5 (S1205), the unwinding device 2 stops unwinding (S1206). When the first carry-in coil 101a and the second carry-in coil 101b are joined, the unwinding device 2 adjusts the remaining second carry-in coil 101b in accordance with the rolling speed of the cold rolling mill 1 that performs rolling at the steady rolling speed. The strip is unwound (S1207). When the unwinding device 2 unwinds the strip tail end of the second loading coil 101b and loads and mounts the third loading coil 101c (S1208), the strip of the third loading coil 101c is wound to the bonding device 5 at the plate speed. When the strip tip of the third carry-in coil 101c is fed to the joining position of the joining device 5 (S1209), the unwinding device 2 stops unwinding (S1210). When the second carry-in coil 101b, the third carry-in coil, and 101c are joined, the unwinding device 2 continues the remaining third carry-in coil in accordance with the rolling speed of the cold rolling mill 1 that performs rolling at the steady rolling speed. The strip 101c is unwound (S1211). When the strip tail end of the third carry-in coil 101c is unwound from the unwinding device 2, the unwinding device 2 stops (S1212).

The control device 20 controls the winding / unwinding device 4 (second winding / unwinding device) as follows. When the strip of the first carry-in coil 101a is fed out from the unwinding device 2, passed through, and further fed out to the winding / unwinding device 4, the winding / unwinding device 4 grips the strip end of the first carry-in coil 101a. (S1401). In accordance with the rolling speed of the cold rolling mill 1 that performs rolling at the steady rolling speed, the winding / unwinding device 4 winds the strip of the first carry-in coil 101a (S1402), and rolls the strip of the first carry-in coil 101a. The winding / unwinding device 4 decelerates and stops winding in accordance with the procedure for stopping (S1403). When the first carry-in coil 101a and the second carry-in coil 101b are joined, the winding / unwinding device 4 moves the remaining first carry-in coil in accordance with the rolling speed of the cold rolling mill 1 that performs rolling at a steady rolling speed. The strip of 101a is wound up (S1404), and then the strip of the second carry-in coil 101b joined is wound up (S1405). The winding / unwinding device 4 decelerates and stops winding in accordance with the procedure for stopping the rolling of the strip of the second loading coil 101b when the third loading coil 101c is loaded (S1406). When the 2nd carrying-in coil 101b and the 3rd carrying-in coil 101c are joined, according to the rolling speed of the cold rolling mill 1 which performs rolling at a steady rolling speed, the winding / unwinding device 4 has the remaining second carrying-in. The strip of the coil 101b is wound up (S1407), and the joined strip of the third carry-in coil is subsequently wound up (S1408). When the strip tail end of the third carry-in coil 101c comes immediately before the cold rolling mill 1, the winding / unwinding device 4 stops winding (S1409). In this state, the buildup coil 102 is formed from the three coils 101a, 101b, and 101c (S1410). The outer diameter of the buildup coil 102 is set to φ3000 mm or less.

  The control device 20 controls the joining device 5 as follows. When the strip tail end of the first carry-in coil 101a reaches the joining position and is stopped, and the strip tip of the second carry-in coil 101b is sent out to the joining position, the joining device 5 has the first carry-in coil 101a and the second carry-in coil. 101b is joined (S1501). After that, when the strip tail end of the second carry-in coil 101b reaches the joining position and stops, and the strip tip of the third carry-in coil 101c is sent out to the joining position of the joining device 5, the joining device 5 becomes the second carry-in coil. 101b and the 3rd carrying-in coil 101c are joined (S1502).

  In the first pass, the winding / unwinding device 3 (first winding / unwinding device) and the cutting devices 6a and 6b are not particularly controlled.

  The main control in the second pass and the third pass will be described with reference to FIG.

  The control device 20 controls the cold rolling mill 1 as follows. In the first pass, the strip tail end of the build-up coil 102 stopped just before the cold rolling mill 1 is sent to the winding / unwinding device 3 in the direction opposite to the first pass, and the strip end is taken up by the winding / unwinding device 3. The cold rolling mill 1 is controlled to be reduced (S2101). When the rolling preparation is completed, the cold rolling mill 1 accelerates to the steady rolling speed in the opposite direction to the first pass, and performs the second pass rolling at the steady rolling speed (S2102). When the strip end of the build-up coil 102 is unwound from the winding / unwinding device 4 with the winding end being gripped by the winding / unwinding device 4, the cold rolling mill 1 decelerates and stops (S2103), and the second pass The rolling is finished (S2104). Thereafter, before the rolling of the third pass is started, the cold rolling mill 1 is controlled to be reduced so as to obtain a desired sheet thickness (S3101). When the rolling preparation is completed, the cold rolling mill 1 accelerates to the steady rolling speed in the direction opposite to the second pass, and performs the third pass rolling at the steady rolling speed (S3102). When the strip end of the build-up coil 102 is unwound from the winding / unwinding device 3 with the strip end gripped by the winding / unwinding device 3, the cold rolling mill 1 decelerates and stops (S3103), and the third pass The rolling is finished (S3104).

  The control device 20 controls the winding / unwinding device 3 (first winding / unwinding device) as follows. In the first pass, when the strip tail end of the build-up coil 102 stopped just before the cold rolling mill 1 is sent to the winding / unwinding device 3 in the direction opposite to the first pass, the winding / unwinding device 3 is stripped. The end is gripped (S2301). In accordance with the rolling speed of the cold rolling mill 1 that performs rolling at the steady rolling speed, the winding / unwinding device 3 winds up the strip of the build-up coil 102 (S2302), and decelerates at the end of the second pass rolling. And stop (S2303). Thereafter, the winding / unwinding device 3 unwinds the strip of the build-up coil 102 in accordance with the rolling speed of the cold rolling mill 1 that performs rolling at the steady rolling speed (S3301), and matches the end of the third pass rolling. To decelerate and stop (S3302).

  The control device 20 controls the winding / unwinding device 4 (second winding / unwinding device) as follows. The winding / unwinding device 4 unwinds the strip of the build-up coil 102 in the reverse direction to the first pass to the winding / unwinding device 3 at a sheet feed speed (S2401). In accordance with the rolling speed of the cold rolling mill 1 that performs rolling at the rolling speed, the winding / unwinding device 4 unwinds the strip of the build-up coil 102 (S2402), and decelerates at the end of the second pass rolling. It stops (S2403). Thereafter, the winding / unwinding device 4 winds the strip of the build-up coil 102 in accordance with the rolling speed of the third pass of the cold rolling mill 1 that performs rolling at the steady rolling speed in the direction opposite to the second pass ( (S3401), it decelerates and stops at the end of rolling in the third pass (S3402).

  In the second to third passes, control of the unwinding device 2, the joining device 5, and the cutting devices 6a and 6b is not particularly performed.

  The main control in the fourth pass (final pass) will be described with reference to FIG. In the fourth pass (final pass), the build-up coil is divided into three carry-out coils 103a to 103c.

  The control device 20 controls the cold rolling mill 1 as follows. After the end of the third pass rolling, before the start of the fourth pass rolling, the cold rolling mill 1 is controlled to obtain a desired plate thickness (S4101). When the preparation for rolling is completed, the cold rolling mill 1 accelerates to the steady rolling speed in the direction opposite to the third pass, and performs rolling in the fourth pass (final pass) at the steady rolling speed (S4102). The cold rolling mill 1 decelerates at a low speed (for example, 10 mpm) in accordance with the procedure in which the strip of the buildup coil 102 is divided by the cutting device 6a and the first carry-out coil 103a is carried out from the winding / unwinding device 3. Rolling is performed (S4103). When the winding preparation of the remaining strip (corresponding to the second carry-in coil 103b) is completed, the cold rolling mill 1 again accelerates to the steady rolling speed, and the final pass unrolled strip of the build-up coil 102 at the steady rolling speed. Rolling is performed (S4104), and the cold rolling mill 1 is decelerated in accordance with the procedure in which the strip of the buildup coil 102 is divided by the cutting device 6a and the second unloading coil 103b is unloaded from the winding / unwinding device 3. Rolling is performed at a low speed (for example, 10 mpm) (S4105). When the winding preparation of the remaining strip (corresponding to the third carry-in coil 103c) is completed, the cold rolling mill 1 again accelerates to the steady rolling speed, and the final pass unrolled strip of the build-up coil 102 at the steady rolling speed. Rolling is performed (S4106), and the cold rolling mill 1 is decelerated in accordance with the procedure in which the strip of the buildup coil 102 is divided by the cutting device 6a and the third unloading coil 103c is unloaded by the winding / unwinding device 3. Rolling is performed at a low speed (for example, 10 mpm) (S4107). When the third carry-out coil 103c is separated from the strip of the buildup coil 102 by the cutting device 6a, the cold rolling mill 1 stops rolling (S4108) and finishes rolling in the fourth pass (final pass) (S4109). ).

  The control device 20 controls the winding / unwinding device 3 (first winding / unwinding device) as follows. In accordance with the rolling speed of the fourth pass (final pass) of the cold rolling mill 1 that performs rolling at the steady rolling speed, the winding / unwinding device 3 winds up the strip of the buildup coil 102 (S4301), and has a predetermined length. When winding, the winding / unwinding device 3 winds the strip of the build-up coil 102 in accordance with the rolling speed of the cold rolling mill 1 that performs rolling at a low speed (for example, 10 mpm) in accordance with the dividing procedure (S4302). ) After the first unloading coil 103a is cut off, the winding / unwinding device 3 winds up the remaining strip at a high speed (S4303). After the winding is completed, the winding / unwinding device 3 extracts and unloads the first unloading coil 103a. (S4304). The tip of the strip to be subsequently fed out (tip of the second carry-in coil 103b) is wound up with a belt wrapper (S4305). When the winding preparation is completed, the fourth pass (final pass) of the cold rolling mill 1 that performs rolling at a steady rolling speed is completed. The winding / unwinding device 3 winds the strip of the buildup coil 102 in accordance with the rolling speed of the pass) (S4306), and rolls at a low speed (for example, 10 mpm) in accordance with the dividing procedure when winding the strip for a predetermined length. In accordance with the rolling speed of the cold rolling mill 1 to be performed, the winding / unwinding device 3 winds the strip of the build-up coil 102 (S4307), and after the second unloading coil 103b is cut, the winding / unwinding device 3 The strip is wound at a high speed (S4308), and after the winding is completed, the winding / unwinding device 3 extracts and unloads the second unloading coil 103b (S4309). The tip of the strip to be subsequently fed out (tip of the third carry-in coil 103c) is wound up with a belt wrapper (S4310). When the winding preparation is completed, the fourth pass (final pass) of the cold rolling mill 1 that performs rolling at a steady rolling speed is completed. The winding / unwinding device 3 winds up the strip of the build-up coil 102 in accordance with the rolling speed of the pass (S4311), and rolls at a low speed (for example, 10 mpm) in accordance with the dividing procedure when the strip is wound for a predetermined length. The strip of the buildup coil 102 is wound up in accordance with the rolling speed of the cold rolling mill 1 to be performed (S4312), and after the third unloading coil 103b is cut, the winding and unwinding device 3 winds up the remaining strip at a high speed ( S4313) After winding is completed, the winding / unwinding device 3 extracts and unloads the third unloading coil 103c (S4314).

  The control device 20 controls the winding / unwinding device 4 (second winding / unwinding device) as follows. In accordance with the rolling speed of the fourth pass (final pass) of the cold rolling mill 1 that performs rolling at the steady rolling speed, the winding / unwinding device 4 unwinds the strip of the buildup coil 102 (S4401), and has a predetermined length. When unwinding, the winding / unwinding device 4 unwinds the strip of the build-up coil 102 in accordance with the rolling speed of the cold rolling mill 1 that performs rolling at a low speed (for example, 10 mpm) in accordance with the dividing procedure (S4402). ). Thereafter, the winding / unwinding device 4 unwinds the strip of the build-up coil 102 in accordance with the rolling speed of the cold rolling mill 1 that performs rolling again at the steady rolling speed (S4403), and when the coil is unrolled for a predetermined length, it is divided. The winding / unwinding device 4 unwinds the strip of the build-up coil 102 in accordance with the rolling speed of the cold rolling mill 1 that performs rolling at a low speed (for example, 10 mpm) according to the procedure to be performed (S4404). Thereafter, the winding / unwinding device 4 unwinds the strip of the build-up coil 102 in accordance with the rolling speed of the cold rolling mill 1 that performs rolling again at the steady rolling speed (S4405), and divides it when unwinding for a predetermined length. The winding / unwinding device 4 unwinds the strip of the build-up coil 102 in accordance with the rolling speed of the cold rolling mill 1 that performs rolling at a low speed (for example, 10 mpm) in accordance with the procedure to be performed (S4406). After the third unloading coil 103b is divided, the winding / unwinding device 4 winds the remaining strip, and extracts and unloads the off-gauge coil 103d (S4407).

  The control device 20 controls the cutting device 6a as follows. The control device 20 calculates each cutting position from the respective coil outer diameters and reel rotation speeds of the winding / unwinding devices 3 and 4, and the cutting device 6a removes the first carry-out coil 103a from the strip of the buildup coil 102 at the cutting position. The second carry-out coil 103b is cut from the remaining strip at the next cutting position (S4602), and the third carry-out coil 103c is cut from the remaining strip at the next cutting position (S4603).

  In the present embodiment, the control device 20 calculates the cutting position based on the outer diameter of the coil and the reel rotation speed. However, the cutting position is subjected to drilling or the like, and a cutting position detection device (not shown) detects the cutting position. There is also a method. There is also a method of grasping the cutting position by calculating the distance using the distance measuring function of the plate speedometer.

  In the fourth pass (final pass), the unwinding device 2, the joining device 5, and the cutting device 6b are not particularly controlled.

<Main operations>
The operation of the cold rolled material facility according to the present embodiment will be described. The operation in the case where the build-up coil 102 is formed from the three carry-in coils 101, four-pass rolling, and the three carry-in coils 103 are formed will be described.

(First pass)
When the first carry-in coil 101a is carried into and attached to the unwinding device 2, the strip of the first carry-in coil 101a is unwound at a plate feed speed, passed through the cold rolling mill 1, and the take-up unwind device 4 It is gripped and wound up several more times. Thereafter, the cold rolling mill 1 is subjected to reduction control (S1201 → S1202 → S1101 → S1401 → S1102).

  When the first pass rolling preparation is completed, the strip of the first carry-in coil 101a is rolled at the steady rolling speed by the cold rolling mill 1 and unwound from the unwinding device 2 in accordance with the rolling speed of the cold rolling mill 1. It is wound around the winding / unwinding device 4 (S1203 → S1103 → S1402). When the control device 20 commands the rolling speed of the cold rolling mill 1, the cold rolling mill 1 is feedback controlled so that the command rolling speed is reached. The unwinding device 2 is tension feedback controlled so that the strip tension between the unwinding device 2 and the cold rolling mill 1 becomes a predetermined value. Further, the winding / unwinding device 4 is also subjected to tension feedback control so that the strip tension between the winding / unwinding device 4 and the cold rolling mill 1 becomes a predetermined value.

  When the strip of the first carry-in coil 101a is unwound from the unwinding device 2 and the tail end of the first carry-in coil 101a reaches the joining position of the joining device 5 and stops, the cold rolling mill 1 and the unwinding device 2 Then, the winding / unwinding device 4 is stopped, and the second loading coil 101b is loaded and attached to the unwinding device 2 (S1204 → S1104 → S1403).

  In the state where the cold rolling mill 1 and the winding / unwinding device 4 are stopped, the strip of the second carry-in coil 101b is unwound from the unwinding device 2 at the plate passing speed, and the strip tip is fed to the joining position of the joining device 5. If it is stopped, the strip tail end of the first carry-in coil 101a and the strip tip end of the second carry-in coil 101b are joined by the joining device 5 (S1205 → S1206 → S1501).

  When the first carry-in coil 101a and the second carry-in coil 101b are joined, the unrolled strip of the first carry-in coil 101a is rolled again at the steady rolling speed by the cold rolling mill 1 and then joined second. The strip of the carry-in coil 101 b is rolled at a steady rolling speed by the cold rolling mill 1, and the strip is unwound from the unwinding device 2 in accordance with the rolling speed of the cold rolling mill 1 and taken up by the winding unwinding device 4. (S1105 → 1404 → S1207 → S1106 → S1405).

  When the strip of the second carry-in coil 101b is unwound from the unwinding device 2 and the tail end of the second carry-in coil 101b reaches the joining position of the joining device 5 and stops, the cold rolling mill 1 and the unwinding device 2 Then, the winding / unwinding device 4 is stopped, and the third loading coil 101c is loaded and attached to the unwinding device 2 (S1208 → S1107 → S1406).

  In a state where the cold rolling mill 1 and the winding / unwinding device 4 are stopped, the strip of the third carry-in coil 101c is unwound from the unwinding device 2 at the plate passing speed, and the strip tip is fed to the joining position of the joining device 5. Then, the joining device 5 joins the strip tail end of the second carry-in coil 101b and the strip tip of the third carry-in coil 101c (S1209 → S1210 → S1502).

  When the second carry-in coil 101b and the third carry-in coil 101cb are joined, the unrolled strip of the second carry-in coil 101b is rolled again at the steady rolling speed by the cold rolling mill 1 and then joined together. The strip of the carry-in coil 101 b is rolled at a steady rolling speed by the cold rolling mill 1, and the strip is unwound from the unwinding device 2 in accordance with the rolling speed of the cold rolling mill 1 and taken up by the winding unwinding device 4. (S1108 → 1407 → S1211 → S1109 → S1408).

  When the strip of the third carry-in coil 101c is unwound, the unwinding device 2 stops, and when the strip tail end of the third carry-in coil 101c reaches just before the cold rolling mill 1, the cold rolling mill 1 stops and the second 1 pass is complete | finished and the winding / unwinding apparatus 4 stops according to the stop of the cold rolling mill 1 (S1212-> S1110-> S1111-> S1409).

  Thereby, the buildup coil 102 is formed in the winding / unwinding device 4 (S1410).

(2nd to 3rd pass)
After the first pass, the rolling direction is switched to the reverse direction and the second pass is started.

  The strip of the build-up coil 102 is unwound from the winding / unwinding device 4 at a sheet passing speed, and the tail end of the strip is gripped by the winding / unwinding device 3 and further wound several times. Thereafter, the cold rolling mill 1 is subjected to reduction control (S2401 → S2301 → S2101).

  When the preparation for the second pass rolling is completed, the strip of the build-up coil 102 is rolled at the steady rolling speed by the cold rolling mill 1 and is unwound from the winding / unwinding device 4 in accordance with the rolling speed of the cold rolling mill 1. Then, it is wound up by the winding and unwinding device 3 (S2402 → S2102 → S2302). When the strip of the build-up coil 102 is unwound for a predetermined length, the cold rolling mill 1 stops and finishes the second pass, and when the cold rolling mill 1 stops, the winding unwinding device 3 and the winding unwinding The apparatus 4 stops (S2103 → S2403 → S2303 → S2104).

  After the second pass, the rolling direction is switched to the reverse direction and the third pass is started.

  In a state where the strip of the buildup coil 102 is gripped by the winding / unwinding device 4 and the winding / unwinding device 3, the cold rolling mill 1 is controlled to be reduced, and the strip of the buildup coil 102 is controlled by the cold rolling mill 1. Rolled at a steady rolling speed, unwound from the winding / unwinding device 3 in accordance with the rolling speed of the cold rolling mill 1, and wound on the winding / unwinding device 4 (S3101 → S3102 → S3301 → S3401). When the strip of the build-up coil 102 is unwound for a predetermined length, the cold rolling mill 1 stops and finishes the third pass. When the cold rolling mill 1 stops, the winding unwinding device 3 and the winding unwinding The apparatus 4 stops (S3103 → S3302 → S3402 → S3104).

(4th pass)
After the third pass, the rolling direction is switched to the reverse direction and the fourth pass is started.

  In a state where the strip of the buildup coil 102 is gripped by the winding / unwinding device 4 and the winding / unwinding device 3, the cold rolling mill 1 is controlled to be reduced, and the strip of the buildup coil 102 is controlled by the cold rolling mill 1. Rolled at a steady rolling speed, unwound from the winding / unwinding device 4 in accordance with the rolling speed of the cold rolling mill 1 and wound on the winding / unwinding device 3 (S4101 → S4102 → S4301 → S4401).

  Immediately before the strip corresponding to the first carry-out coil 103a is taken up by the winding / unwinding device 3, the cold rolling mill 1 is decelerated to a predetermined low speed, and the strip of the build-up coil 102 is slowed down by the cold rolling mill 1. It is rolled at (for example, 10 mpm), unwound from the winding / unwinding device 4 in accordance with the rolling speed of the cold rolling mill 1, and wound up by the winding / unwinding device 3 (S4103 → S4302 → S4402).

  In a state where the strip is wound around the winding / unwinding device 3 at a low speed, the strip of the build-up coil 102 is cut by the cutting device 6a at the strip cutting position, and the remaining strip of the cut-out first carry-out coil 103a is wound up. It is wound around the unwinding device 3 at a high speed. When the strip is wound, the winding / unwinding device 3 stops, and the first carry-out coil 103a is extracted from the winding / unwinding device 3 and carried out (S4601 → S4303 → S4304). Note that a collapsible reel is applied to the winding / unwinding device 3 as described above.

  While the first carry-out coil 103a is being carried out, the remaining strip of the divided buildup coil 102 is rolled at a low speed by the cold rolling mill 1 and wound in accordance with the rolling speed of the cold rolling mill 1. Unwinding is performed from the unwinding device 4. The tip of the fed strip (corresponding to the second carry-in coil 103b) is wound up by the belt wrapper of the winding / unwinding device 3 (S4305).

  When the winding preparation of the winding / unwinding device 3 is completed, the remaining strip of the build-up coil 102 is rolled at a steady rolling speed by the cold rolling mill 1 and wound in accordance with the rolling speed of the cold rolling mill 1. The material is unwound from the unwinding device 4 and wound on the unwinding / unwinding device 3 (S4104 → S4306 → S4403).

  Immediately before the strip corresponding to the second carry-out coil 103b is taken up by the winding / unwinding device 3, the cold rolling mill 1 is decelerated to a predetermined low speed, and the strip of the build-up coil 102 is slowed down by the cold rolling mill 1. Is rolled out from the winding / unwinding device 4 in accordance with the rolling speed of the cold rolling mill 1 and wound into the winding / unwinding device 3 (S4105 → S4307 → S4404).

  In a state where the strip is wound around the winding / unwinding device 3 at a low speed, the strip of the build-up coil 102 is divided by the cutting device 6a at the strip cutting position, and the remaining strip of the divided second carry-out coil 103b is wound up. It is wound around the unwinding device 3 at a high speed. When the strip is wound, the winding / unwinding device 3 stops, and the second unloading coil 103b is extracted from the winding / unwinding device 3 and is unloaded (S4602 → S4308 → S4309).

  While the second carry-out coil 103b is being carried out, the remaining strip of the divided buildup coil 102 is rolled at a low speed by the cold rolling mill 1 and wound in accordance with the rolling speed of the cold rolling mill 1. Unwinding is performed from the unwinding device 4. The tip of the fed strip (corresponding to the third carry-in coil 103c) is wound up by the belt wrapper of the winding / unwinding device 3 (S4310).

  When the winding preparation of the winding / unwinding device 3 is completed, the remaining strip of the build-up coil 102 is rolled at a steady rolling speed by the cold rolling mill 1 and wound in accordance with the rolling speed of the cold rolling mill 1. The material is unwound from the unwinding device 4 and wound on the unwinding / unwinding device 3 (S4106 → S4311 → S4405).

  Immediately before the strip corresponding to the third carry-out coil 103c is taken up by the winding / unwinding device 3, the cold rolling mill 1 is decelerated to a predetermined low speed, and the strip of the build-up coil 102 is slowed down by the cold rolling mill 1. Is rolled from the winding / unwinding device 4 in accordance with the rolling speed of the cold rolling mill 1 and wound on the winding / unwinding device 3 (S4107 → S4312 → S4406).

  In a state where the strip is wound around the winding / unwinding device 3 at a low speed, the strip of the build-up coil 102 is divided by the cutting device 6a at the strip cutting position, and the remaining strip of the third third discharging coil 103c is wound up. It is wound around the unwinding device 3 at a high speed. When the strip is wound, the winding / unwinding device 3 stops, and the third unloading coil 103c is extracted from the winding / unwinding device 3 and unloaded (S4603 → S4313 → S4314).

  When the third carry-out coil 103c is divided, the cold rolling mill 1 stops rolling and finishes the fourth pass, and the remaining strip of the divided build-up coil 102 is taken up by the winding / unwinding device 4. The wound off-gauge coil 103d is extracted from the winding / unwinding device 4 and carried out (S4108 → S4109 → S4407). As described above, a collapsible reel is applied to the winding / unwinding device 4.

  Thereby, the unloading coils 103a to 103c are unloaded from the winding / unwinding device 3, and the off-gauge coil 103d is unloaded from the winding / unwinding device 4. When the final path is an odd number, the strip of the build-up coil 102 is cut by the cutting device 6b, the carry-out coils 103a to 103c are extracted from the take-up / winding device 4 and carried out, and the off-gauge coil 103d is taken up. It is unloaded from the unwinding device 3.

  For convenience of explanation, the steady rolling speed is described in the first to fourth passes without distinction. However, as the time table shown in FIGS. Will increase.

<Main effects>
The effect of this embodiment will be described by comparing it with the first conventional technique and the second conventional technique.

  FIG. 8 is a schematic view of a cold rolled material facility according to the first prior art. The same components as those in FIG. 1 are denoted by the same reference numerals.

  In FIG. 8, the cold rolled material facility (RCM facility) according to the first prior art mainly includes a reversible cold rolling mill 1 and a strip for the cold rolling mill 1 in the first pass. The unwinding device 2, the winding / unwinding device 3 arranged on the inlet side of the first pass of the cold rolling mill 1, and the winding / unwinding arranged on the outlet side of the first pass of the cold rolling mill 1 A control device 20 for controlling the device 4, the cold rolling mill 1, the unwinding device 2, and the winding / unwinding devices 3 and 4 is provided.

  The operation in the case where the three carry-in coils 101 are each subjected to four-pass rolling using the cold rolled material facility according to the first prior art will be described.

  The carry-in coil 101a is carried into the unwinding device 2, the strip tip is threaded, gripped by the unwinding / unwinding device 4, and further wound by several turns, and after preparation for rolling such as tension application and reduction is completed, The cold rolling mill 1 starts the first pass rolling. When the strip tail end comes just before the cold rolling mill 1, the first pass rolling is finished.

  Thereafter, the strip tip is passed in the direction opposite to the first pass, the strip tip is gripped by the winding / unwinding device 3, and further wound by several turns, after completion of preparation for rolling such as tension application and reduction, The cold rolling mill 1 starts the second pass rolling. The second pass rolling is completed in a state where the winding and unwinding device 3 grips several strip ends.

  After the preparation for rolling such as tension application and reduction in the third pass is completed, rolling in the third pass is started by the cold rolling mill 1. The third pass rolling is finished in a state where the winding and unwinding device 4 grips several strip ends.

  After completion of rolling preparation such as application of tension and reduction of the fourth pass, rolling of the fourth pass is started by the cold rolling mill 1. The unloading coil 103a after rolling in the fourth pass is taken up by the winding / unwinding device 3, extracted, and unloaded.

  Similarly, the carry-in coil 101b is carried into the unwinding device 2, the carry-out coil 103b is carried out from the winding / unwinding device, the carrying-in coil 101c is carried into the unwinding device 2, and the carry-out coil 103c is carried out into the winding / unwinding device 3. It is carried out from.

  At this time, the strip tips and tail ends of the carry-out coils 103a to 103c became unrolled portions, and there was a problem that the off-gauge rate was as high as about 2.5%. In addition, a total of 6 sheets are passed, and a total of 12 reversible rollings are performed, which causes a problem that the actual rolling time in the operation time is short and the production efficiency is poor. The second prior art solves the problem of the first prior art.

  FIG. 9 is a schematic diagram of cold rolled material equipment according to the second prior art. The same components as those in FIG. 1 are denoted by the same reference numerals.

  In FIG. 9, the cold rolled material facility according to the second prior art mainly includes a reversible cold rolling mill 1, an unwinding device 2 for unwinding the strip of the carry-in coil 101, and a cold rolling mill. Winding / unwinding device 3A (first winding / unwinding device) disposed on the entry side of one first pass and winding / unwinding device disposed on the exit side of the first pass of the cold rolling mill 1 4A (second winding / unwinding device), a joining device 5 for forming the build-up coil 102 from the plurality of carry-in coils 101, and a cutting device 6 for dividing the strip of the build-up coil 102 to form the carry-out coil 103. A buildup coil winding and unwinding device 111 for forming the buildup coil, a winding device 112 disposed on the entry side of the first pass of the cold rolling mill 1 and winding the unloading coil 103, Winding arranged on the exit side of the first pass of the rolling mill 1 Apparatus 113, cold rolling mill 1, unwinding apparatus 2, winding unwinding apparatuses 3A and 4A, joining apparatus 5, cutting apparatus 6, buildup coil winding unwinding apparatus 111, and winding apparatuses 112 and 113. A control device 20 for controlling is provided.

  A solid reel is applied to the winding / unwinding devices 3A and 4A and the buildup coil winding / unwinding device 111, and a collapsible reel is applied to the winding device 2 and the winding devices 112 and 113. .

  The operation in the case where the three carry-in coils 101 are each subjected to four-pass rolling using the cold-rolled material equipment according to the second prior art will be described. The carry-in coil 101a is carried into the unwinding device 2 and unwound, and the end of the strip is gripped and taken up by the build-up coil take-up and unwinding device 111. When the strip tail end of the carry-in coil 101a reaches the joining position of the joining device 5 and stops, the carry-in coil 101b is carried into the unwinding device 2 and unwound until the strip tip is sent out to the joining position of the joining device 5, Then, the joining device 5 joins the strip tail end of the first carry-in coil 101a and the strip tip of the second carry-in coil 101b. The joined strip is taken up by the build-up coil take-up and unwinding device 111.

  Similarly, the strip tail end of the second carry-in coil 101b and the strip tip end of the third carry-in coil 101c are joined by the joining device 5, and the joined strip is taken up by the build-up coil winding / unwinding device 111, Thus, the buildup coil 102 is formed in the buildup coil winding / unwinding device 111.

  The strip of the buildup coil 102 is unwound from the winding / unwinding device 111 for buildup coil, passed through, gripped by the winding / unwinding device 4A, and after the reduction control, the cold rolling machine 1 performs the first pass. Rolling is performed. Thereafter, the strip is subjected to reversible rolling in the second and third passes between the winding / unwinding device 3A and the winding / unwinding device 4A.

  After the third pass, the grip of the winding / unwinding device 3 is released, and the strip end is unwound from the winding / unwinding device 3. The unwinding strip end is gripped by the winding device 112, and after the reduction control, the fourth pass rolling is performed. When a strip having a predetermined length corresponding to the carry-out coil 103a is taken up by the winding device 112, the strip of the build-up coil 102 is cut by the cutting device 6a at the strip cutting position, and the cut-out carry coil 103a is taken up by the winding device 112. It is extracted from and taken out.

  Similarly, the remaining strips are also divided by the cutting device 6a, and the divided carry-out coils 103b and 103c are sequentially extracted from the winding device 112 and carried out. Note that a collapsible reel is applied to the winding / unwinding device 112 as described above.

  The cutting device 6b is disposed between the cold rolling mill 1 and the winding device 113, and divides the strip of the build-up coil 102 in a path in which the winding device 113 completes winding.

  At this time, since the unrolled portion is generated only at the strip tip of the carry-out coil 103a and the strip tail end of the carry-out coil 103c, the off-gauge rate can be greatly reduced. In addition, since two passes and four reversible rollings are performed, the actual rolling time in the operation time becomes longer, and the production efficiency is improved as compared with the first prior art.

  In the above description, the case where three carry-in coils are rolled has been described for the sake of convenience. However, the cold rolled material facility according to the second prior art is assumed to be a relatively large-scale production facility with an annual production of 800,000 tons or more. Yes. Compared with the cold-rolled material facility according to the first prior art, the cold-rolled material facility according to the second prior art has a joining device 5, a cutting device 6, a build-up coil winding / unwinding device 111, and a winding device. The configuration of 112 and 113 is increased, and the initial cost is increased. In addition, since a large number of carry-in coils are built up into one coil and the build-up coil is lengthened, the winding and unwinding devices 3A and 4A and the build-up coil winding and unwinding device 111 are increased in size. Cost increases.

  In addition, when the build-up coil 102 is lengthened, it is difficult to apply a collaps type reel to the winding / unwinding devices 3A and 4A and the build-up coil winding / unwinding device 111, and it is necessary to apply a solid block type reel. . Therefore, in addition to the winding / unwinding devices 3A and 4A and the build-up coil winding / unwinding device 111, winding devices 112 and 113 to which a collapsible reel is applied are separately required.

  The cold-rolled material equipment related to the second conventional technology assumes a relatively large-scale production facility with an annual production of 800,000 tons or more, and prioritizes lowering the off-gauge rate and improving production efficiency. A little bulky does not matter. However, if the cold rolled material facility related to the second conventional technology is applied to small- to medium-scale production facilities with annual production of about 300,000 tons to 600,000 tons, the problem of initial cost becomes significant and cost-effective. There was a problem in terms of.

  The effect of this embodiment will be described by comparing it with the first prior art. In the cold-rolled material equipment according to the present embodiment, two passes and four reversible rollings are performed. That is, by forming the build-up coil 102 in the first pass and performing the reversible rolling of the build-up coil 102 after the second pass, the joint can also be rolled at the normal rolling speed, compared to the first prior art. Production efficiency is improved. Further, since the unrolled portion is generated only at the strip tip of the carry-out coil 103a and the strip tail end of the carry-out coil 103c, the off-rolled portion can be greatly reduced. Furthermore, the portion of the unsteady rolling speed is reduced and the plate thickness accuracy is improved. That is, it is possible to maintain a high efficiency and a high yield as high as those of the second conventional technique.

  Another effect of the present embodiment will be described by comparing with the second prior art. In the first pass, following the rolling of the first carry-in coil 101a and the joining of the first carry-in coil 101a and the second carry-in coil 101b, the rolling and the joining are repeated, and the first pass rolling by the cold rolling mill 1 is performed. The leading end of the leading coil and the leading end of the succeeding coil are joined by the joining device 5 and the plurality of carry-in coils 101 are made into one build-up coil 102, whereby the winding for the build-up coil that is essential in the second conventional technique The unwinding device 111 becomes unnecessary. Thereby, the equipment configuration can be simplified, and as a result, the initial cost can be reduced.

  Furthermore, as will be described later, the winding devices 112 and 113, which are essential in the second prior art, are no longer necessary, and the increase in the size of the winding and unwinding devices 3 and 4 can be suppressed, thereby simplifying the equipment configuration. As a result, the initial cost can be further reduced.

  As described above, in a small to medium-sized production facility with an annual production volume of about 300,000 tons to 600,000 tons, high efficiency and high yield are maintained, and initial cost is reduced to improve return on investment costs. be able to.

  Further, in the present embodiment, a mash seam welding type joining device is used as the joining device 5. Thereby, the return on investment cost can be improved.

<Composition related to bonding and its effect>
In forming the build-up coil 102, the first carry-in coil 101a and the second carry-in coil 101b having a uniform thickness are joined, and the second carry-in coil 101b and the third carry-in coil 101c having a uniform thickness are joined to each other. It is assumed that there is no change in thickness of 102. However, in reality, the plate thickness may differ between the carry-in coils 101a to 101c due to an error, and a step is generated at the joint. The joint is located in the inner layer of the build-up coil 102. When tension is applied to the coil in this state, the step in the joint is transferred to the inside and outside of each layer, resulting in a product defect that is handled as a flaw. .

  For example, assuming that the plate thickness of the first carry-in coil 101a is 3.2 mm, the plate thickness of the second carry-in coil 101b is 2.0 mm, and the plate thickness of the third carry-in coil 101c is 2.6 mm, the first carry-in coil 101a A step of 1.2 mm occurs at the joint with the second carry-in coil 101b.

  At this time, the process computer 21 (see FIG. 1), which is the host computer of the control device 20, manages the plate thickness of each carry-in coil 101, for example, carries in the second carry-in coil 101b and the third carry-in coil 101c. Control is performed to change the order. After the replacement, the step at the joint between the first carry-in coil 101a and the second carry-in coil 101b is 0.6 mm, and the step at the joint between the second carry-in coil 101b and the third carry-in coil 101c is 0.6 mm.

  In this way, by adjusting the order of the coils carried into the unwinding device 2 in advance so that the absolute value of the plate thickness difference is 1 mm or less, the level difference of the joint portion located in the inner layer portion of the built-up coil Transfer of wrinkles to adjacent coil layers can be suppressed. Furthermore, it is more preferable that the absolute value of the plate thickness difference is 0.5 mm or less.

  In the present embodiment, a mash seam welding type joining device is used as the joining device 5 in order to reduce the initial cost.

  FIG. 10 is a conceptual diagram of the mash seam welding method.

  On the other hand, when a mash seam welding type joining device is used, a new problem relating to the joint occurs. In other words, the mash seam welder adopts a method in which the material to be joined is sandwiched between overlapping electrode wheels and energized to generate heat in the contact resistance and internal resistance of the material, and a melted and solidified part called nugget N is generated and joined. It is. Thereby, the plate | board thickness of the junction part after completion | finish of joining increases to about 1.2 to 1.5 times. The thickened joint becomes a step, and an excessive force acts on the roll when passing through the rolling mill 1. Further, the step may be transferred as a mark to the work roll. Moreover, the level | step difference of a junction part may be transcribe | transferred to the inner side and the outer side of each layer. There was a problem that caused such product defects.

  The joining apparatus 5 performs the cross swaging process which inclines a swaging roller and rolls the thickened junction part after mash seam welding. Thereby, a level | step difference can be smoothed and the subject concerning a junction part can be solved. Hereinafter, the configuration and operation of the bonding apparatus 5 will be described.

  FIG. 11 is a schematic view of the joining device 5. The joining device 5 includes a pair of upper and lower electrode wheels 51 and 52, a pair of upper and lower pressure rollers 53 and 54, inlet and outlet clamping devices 55 and 56, a carriage frame 57, an electrode wheel pressing device 58 and a pressure roller pressing device. 59. The upper electrode wheel 51 and the upper pressure roller 53 are supported on the upper horizontal frame of the carriage frame 57 via the electrode wheel pressing device 58 and the pressure roller pressing device 59, respectively. The lower electrode wheel 52 and the lower pressure roller 54 are respectively It is supported on the lower horizontal frame of the carriage frame 57 via a mounting block. The pair of upper and lower pressure rollers 53 and 54 are disposed in the carriage frame 57 adjacent to the pair of upper and lower electrode wheels 51 and 52.

  At the time of joining, first, both ends of the strip are overlapped, and in this state, the strip is gripped by the clamping members of the entry side and exit side clamping devices 55 and 56 to fix the position. Next, the carriage frame 57 is moved in the welding direction by the driving device, so that the pair of upper and lower electrode wheels 51 and 52 and the pair of upper and lower pressure rollers 53 and 54 supported by the carriage frame 57 are relative to the strip. It is moved and bonding and pressurization are carried out continuously. At this time, the overlapping portion of the strip is sandwiched between a pair of upper and lower electrode wheels 51, 52, the electrode wheels 51, 52 are pressed against the overlapping portion of the strip by the electrode wheel pressing device 58, and the electrode wheels 51, 52 are pressed by the electric motor. While actively rotating, a welding current is passed through the electrode wheels 51 and 52 to cause resistance heating and welding (mash seam welding). Immediately after the overlapping portions are welded by the electrode wheels 51 and 52, the joint (welded portion) J is sandwiched between the pair of upper and lower pressure rollers 53 and 54, and the pressure rollers 53 and 54 are pressed by the pressure roller pressing device 59. Is pressed against the joining portion, and the pressure roller 53, 54 is actively driven to rotate by an electric motor, and the joining portion of the strip is pressed and rolled.

  The pressure roller pressing device 59 is provided with an inclination mechanism 60 for adjusting the inclination angle of the shaft cores 61 and 62 of the pressure rollers 53 and 54. In addition, in order to avoid the complexity of illustration, illustration of the electric motor, the chain, and the sprocket mechanism that rotationally drive the pressure roller is omitted.

  FIG. 12 is a schematic view of the tilt mechanism 60. By operating the tilt mechanism 60, the tilt angle of the axis of the pressure roller 53 can be set to an arbitrary angle in the horizontal plane. A rotation shaft 71 rotatably inserted into the upper horizontal frame of the carriage frame 56 and an electric motor 74 that rotationally drives the rotation shaft 71 through pinions 72 and 73 are provided. The electric motor 74 is an inclination angle control device 75. Controlled by The tilt mechanism 60 includes an angle sensor 76 for detecting the tilt angle of the pressure roller 53, and the tilt angle control device 75 receives angle information from the host control device 77 according to the thickness of the strip before the start of joining. The electric motor 74 is driven and controlled using the signal of the angle sensor 76 so that the inclination angle of the pressure roller 53 matches the set angle.

  The details of the action of promoting the plastic flow (metal flow) in the direction perpendicular to the weld line by inclining the shaft cores 61 and 62 of the pair of upper and lower pressure rollers 53 and 54 will be described with reference to FIG.

FIG. 16 is a diagram showing a metal flow within the contact length when the joints J are rolled while the shaft cores 61 and 62 of the pressure rollers 53 and 54 are inclined. As an example, the upper pressure roller 53 Shows the case. In the figure, A is an arrow indicating the traveling direction (rolling direction) of the pressure roller 53, X is a straight line that virtually indicates the weld line (joining line) of the joint J on the traveling direction A, and Y Is a straight line orthogonal to the weld line X. Further, 63 is a straight line passing through the central portion in the width direction of the pressure roller 53 in the direction perpendicular to the axis, and α is the inclination angle of the pressure roller 53 (the straight line in the direction perpendicular to the axis of the welding line X and the upper pressure roller 53). 63). Further, 64 is a contact length portion where the pressure roller 53 contacts the joint J, R is a speed vector of the pressure roller 53 in the contact length portion 64, and R1 is a welding line X of the speed vector R. R2 is a component in the direction perpendicular to the weld line X of the velocity vector R. )
When the shaft 61 of the pressure roller 53 is inclined in the horizontal plane with respect to the straight line Y orthogonal to the welding line X and is actively rotated while pressing the pressure roller 53 against the joint J, the pressure roller 53 is joined. The frictional force corresponding to the velocity vector component R2 in the direction perpendicular to the weld line X acts on the contact isolated portion 64 with the joint J due to the pressing force and the friction coefficient between the joints J. A shearing force 82 (see FIGS. 14A to 15B) in a direction perpendicular to the weld line X corresponding to 作用 acts, and not only the metal flow in the direction of the velocity vector component R1 (direction parallel to the weld line X) is applied to the joint J Metal flow in the direction of the velocity vector component R2 (perpendicular to the weld line X), that is, plastic flow in the direction perpendicular to the weld line X due to shear deformation by the shear force 82 occurs. The step S of the joint J can be smoothed by shear deformation or plastic flow perpendicular to the weld line X.

  Two kinds of directions of the angle α for inclining the pair of upper and lower pressure rollers 53 and 54 can be set. In the first setting method, as shown in FIGS. 14A and 14B, the traveling direction portions 53A and 54A of the pair of pressure rollers 53 and 54 are in a horizontal plane, and the first contact of the pressure rollers 53 and 54 with the first press roller 53, 54 is performed. This is a case where the shaft cores 61 and 62 of the pair of pressure rollers 53 and 54 are inclined with respect to the straight line Y orthogonal to the welding line X so as to face the direction opposite to the existing direction. In other words, the pressure roller located on the thick side (the material portion of the joint J where the pressure rollers 53 and 54 first contact) starting from the step S of the joint J among the joint J of the strip. The shaft cores 61 and 62 of the pressure rollers 53 and 54 are inclined so that the shaft ends of 53 and 54 face the rolling direction A of the joint J. In this case, a shearing force 82 corresponding to the velocity vector component R2 acts in the direction in which the strip is first contacted by the pressure rollers 53 and 54 from the step S of the joint J of the strip, and the welding line in the same direction. The step portion is rolled and smoothed while applying shear deformation in a perpendicular direction. At this time, a force in a direction opposite to the shearing force 82 acts as a thrust force 81 from the joint J to the pressure rollers 53 and 54. In other words, the reaction force of the thrust force 81 acts on the joint J as the shear force 82.

  As shown in FIGS. 15A and 15B, the second setting method is to incline the pressure rollers 53 and 54 in the opposite direction as compared with the first setting method. That is, the pair of pressure rollers 3 and 54 are arranged so that the traveling direction portions 53A and 54A of the pair of pressure rollers 53 and 54 are in the horizontal plane and face the direction in which the strip with which the pressure rollers 53 and 54 first contact is present. In this case, the four shaft cores 61 and 62 are inclined with respect to the straight line Y orthogonal to the welding line X. In other words, among the joint portion (mash seam welded portion) J of the strip, the side having a small thickness starting from the step S of the joint portion J (the material portion of the joint portion J to which the pressure rollers 53 and 54 do not contact first). The shaft cores 61 and 62 of the pressure rollers 53 and 54 are inclined so that the shaft ends of the pressure rollers 53 and 54 positioned at the position of the pressure rollers 53 and 54 face the rolling direction A of the joint J. In this case, the shearing force 82 corresponding to the velocity vector component R2 is applied in the direction opposite to the direction in which the strip is associated with the metal material first contacted by the pressure rollers 53 and 54 from the step S of the joint J of the strip. Then, the step portion is rolled and smoothed while applying shear deformation in the direction perpendicular to the weld line in the same direction. Also at this time, the force in the direction opposite to the shearing force 82 acts as the thrust force 81 from the joint J to the pressure rollers 53 and 54.

  In the present embodiment, the first setting method is adopted. The reason is as follows. Even if the pair of upper and lower pressure rollers 53 and 54 are inclined by the second setting method, the step S can be plasticized by the shear force 82 and smoothed. However, in this case, as shown in FIG. 15B, a step of the step S is folded into the base material, and a new problem occurs in which the step S is buried in the base material in a crack shape. There is no problem when it is applied to a site where the surface property of the joint J is simply required and the strength is not required, but when applied to a site where stress acts, it is press-molded like a tailored blank. In such plastic working applications, the tip of the buried step becomes a singular stress field, which causes damage. Accordingly, the direction in which the pressure rollers 53 and 54 are inclined is preferably set such that the traveling direction portions 53A and 54A of the pair of pressure rollers 53 and 54 are in a horizontal plane, as shown in FIGS. 14A and 14B. , 54 are inclined with respect to a straight line Y perpendicular to the welding line X so that the axial cores 61, 62 of the pair of pressure rollers 53, 54 are directed in a direction opposite to the direction in which the first contact strip exists. In this case, as shown in FIG. 14B, the step difference can be smoothed without burying the step S in a crack in the base material, and the quality of the joint is improved.

<Other configurations and their effects>
In the present embodiment, the outer diameter of the buildup coil 102 is φ3000 mm or less. Further, the strip tension when the outer diameter of the buildup coil 102 is large is set to be gradually lower than that when the outer diameter is small. FIG. 16 is a diagram illustrating tension control during winding of the buildup coil 102. When the outer diameter of the build-up coil 102 is less than φ1500 mm , a constant predetermined value of tension is applied. However, when the outer diameter of the build-up coil 102 exceeds φ1500 mm , the outer diameter increases gradually. Is set.

  Thereby, the winding force which acts on the buildup coil 102 is limited, and the increase in size of the winding / unwinding devices 3 and 4 due to the increase in the outer diameter of the buildup coil 102 can be suppressed.

  As a result, the winding / unwinding devices 3A and 4A of the second prior art need to apply solid block type reels, but the winding / unwinding devices 3 and 4 of the present embodiment apply a collapsed reel. Can do.

  In the present embodiment, the cutting devices 6a and 6b have a swing mechanism (not shown).

  Cutting equipment in cold tandem rolling mills with an annual production of 1 million tons or more generally divides the coil between runs while continuing rolling. I was taking it. In order to suppress the reduction of annual production and the deterioration of the off-gauge rate, the speed at the time of coil cutting is reduced only to about 100 mpm to 300 mpm, so that the cutting device for dividing the coil between runs while continuing the conventional rolling is inexpensive. However, there is a problem that the initial cost increases when a conventional cutting device is used in a small- to medium-sized production facility having an annual production amount of about 300,000 tons to 600,000 tons.

  In the present embodiment, as described in the operation of the fourth pass (final pass), the rolling speed when dividing the buildup coil 102 is low (for example, 10 mpm). Therefore, a cutting device having a relatively inexpensive rocking mechanism can be applied instead of the conventional expensive inter-running cutting device, and the initial cost can be reduced.

  The cutting device 6a having the swing mechanism can cut the strip without stopping the rolling as described in the operation of the fourth pass.

  In the present embodiment, as described in the operation of the fourth pass (final pass), the rolling speed when the buildup coil 102 is cut by the cutting device 6a is low (for example, 10 mpm). While being rolled at low speed by the cold rolling mill 1, the carry-out coil 103 is divided by the cutting device 6 a, wound at the high-speed winding / unwinding device 3, and then extracted and carried out. It is assumed that this series of operations is performed in about 30 seconds, for example. On the other hand, the distance from the cutting position of the cutting device 6a to the winding / unwinding device 3 is assumed to be 5 m, and the build-up coil 102 strip tip after the division is cooled from the cutting position of the cutting device 6a to the winding / unwinding device 3. When it is sent out in accordance with the rolling speed (10 mpm) of the intermediate rolling mill 1, the arrival time is 30 seconds. That is, the first carry-out coil 103a is carried out before preparation for winding the second carry-in coil 103b.

  Thus, in conjunction with the application of the collaps reel to the winding / unwinding device 3, after the build-up coil 102 is divided, the carrying-out coil 103 is extracted and carried out, and then the next carrying-out coil 103 is continuously wound up. The work can be performed by one winding / unwinding device 3, and the solid block type reel winding / unwinding device 3A and the winding device 112 which are essential in the second prior art are not required. In the case of the present embodiment, the winding / unwinding device 4A and the winding device 113 are not necessary.

  Thereby, the equipment configuration can be simplified, and as a result, the initial cost can be reduced.

  In the second prior art, since rolling stops when dividing, the friction coefficient between the work roll and the strip changes on the surface of the strip sandwiched between the work rolls, so that a stop mark is formed and the work roll In addition, since the stop mark is transferred, the stop mark may be transferred to the surface of the strip at regular intervals at the rotation pitch of the work roll during subsequent rolling. If this stop mark occurs in the final pass, the quality of the surface gloss is impaired, and a material with strict quality has a problem of becoming a defective product.

  In the present embodiment, it is possible to prevent a work roll stop mark from being generated on the strip by continuing rolling (low-speed rolling) even at the time of division.

  By the way, although the subject concerning a junction part is solved as mentioned above, a product coil may require the accuracy further.

  In the present embodiment, the coil division in the final pass is set immediately after the joint passes through the cutting device. That is, the cutting position is immediately after the joint. The cutting position is calculated by the control device 20 from the coil outer diameter and the reel rotation speed of each of the winding / unwinding devices 3 and 4.

  Thereby, a junction part can be arrange | positioned on the outer surface of the carrying-out coil 103, and the process of a junction part can be easily performed after carrying out the carrying-out coil 103 extraction.

  Further, the coil division in the final pass may be performed immediately before the joining portion passes the cutting device and immediately after the joining portion passes the cutting device. That is, the joint is cut off from the carry-out coil 103 by the cutting device 6a.

  As a result, the joint is not wound around the carry-out coil 103, and post-processing of the joint can be made unnecessary.

  Further, before the start of the final pass rolling in the rolling process, the work roll may be replaced with a dull weight work roll in a state where the strip is passed, and the final pass rolling may be performed.

  Thereby, the rolling property at the time of deep drawing performed by the lower process of a cold rolling process, or the adhesiveness of a coating and a sharpness can be improved.

-Second embodiment-
Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 17 is a schematic view of a cold rolled material facility according to the second embodiment of the present invention. While the cold rolling mill 1 of the first embodiment has one stand, the cold rolling mills 1a and 1b of the second embodiment have two stands.

  For convenience of explanation, the cold rolling mill 1 of the first embodiment is set to one stand. However, in order to maximize the effect of improving the annual production amount and reducing the off-gauge rate, the number of stand is set to two stands. Is preferred. Furthermore, 2 stands are preferable in terms of the cost effectiveness. Other configurations are the same as those in the first embodiment, and the control and operation are also the same, and the same effects can be obtained.

-Third embodiment-
Next, a third embodiment of the present invention will be described with reference to the drawings.

<Main configuration>
FIG. 18 is a schematic view of a cold-rolled material facility according to the third embodiment of the present invention. The cold rolled material facility according to the present embodiment includes a strip storage device 9 disposed between the joining device 5 and the cold rolling mill 1 in addition to the configuration of the cold rolled material facility according to the first embodiment. Yes.

  The strip storage device 9 has a movable roller 92 provided between the two fixed rollers 91 a and 91 b, and the drive device (not shown) stores the strip by lowering the movable roller 92. To release the stored strip. The operation of the strip storage device 9 is controlled by the control device 20.

<Main control>
FIG. 19 is a control flow showing a processing procedure performed by the control device 20. The control in the second to fourth passes is the same as the control in the first embodiment, and only the control in the first pass is shown.

  In the control flow of the first embodiment shown in FIG. 2, the control device 20 controls the cold rolling mill 1 so as to stop in accordance with the procedure for carrying in and joining the carry-in coil 101 (S1104, S1107). ) In the control flow of this embodiment, the control device 20 controls the cold rolling mill 1 to perform rolling at a low speed (for example, 10 mpm) in accordance with the procedures for carrying in and joining the carry-in coil 101 (for example, 10 mpm). S1104B, S1107B).

  In the control flow of the first embodiment shown in FIG. 2, the control device 20 controls the winding / unwinding device 4 to stop in accordance with the stop of the cold rolling mill 1 (S1403, S1406). In the control flow of the present embodiment, the control device 20 controls the winding / unwinding device 4 to wind at a low speed in accordance with the low speed rolling of the cold rolling mill 1 (S1403B, S1406B).

  The control device 20 controls the strip storage device 9 as follows. When the first carry-in coil 101a is carried in and attached to the unwinding device 2 and the strip is sent out, the movable roller 92 is lowered and the strip storage device 9 starts storing the strip. The lowering of the movable roller 92 is stopped (S1901B). In accordance with the procedure in which the second carry-in coil 101b is carried into the unwinding device 2 and the strip tail end of the first carry-in coil 101a and the strip tip of the second carry-in coil 101b are joined, the movable roller 92 is raised, The strip storage device 9 gradually releases the storage of the strip, and when the first carry-in coil 101a and the second carry-in coil 101b are joined, the rising of the movable roller 92 is stopped (S1901B). Thereafter, the movable roller 92 is lowered again, and the strip storage device 9 starts storing the strip. When the strip of a predetermined length is stored, the downward movement of the movable roller 92 is stopped (S1903B). In accordance with the procedure in which the third carry-in coil 101c is carried into the unwinding device 2 and the strip tail end of the second carry-in coil 101b and the strip tip of the third carry-in coil 101c are joined, the movable roller 92 is raised, The strip storage device 9 gradually releases the storage of the strip, and when the second carry-in coil 101b and the third carry-in coil 101c are joined, the rising of the movable roller 92 is stopped (S1904B).

  Control related to the unwinding device 2 and the joining device 5 is substantially the same as the control of the first embodiment.

<Main operations>
In the first embodiment, in the first pass, the second carry-in coil 101b is carried into the unwinding device 2, and a series of the strip tail end of the first carry-in coil 101a and the strip tip end of the second carry-in coil 101b are joined. During the operation (S1204 → S1205 → S1206 → S1501), the cold rolling mill 1 is stopped (S1104), but the cold rolled material facility according to this embodiment operates as follows.

  When the first carry-in coil 101a is carried into the unwinding device 2 and the strip is fed out, the strip storage device 9 stores the strip (S1201 → S1202 → S1901B). After that, the strip of the first carry-in coil 101a is rolled and unwound at a steady rolling speed (S1203 → S1103 → S1402). At the same time as the strip is released, the unrolled strip of the first carry-in coil 101a is rolled at a low speed (for example, 10 mpm) by the cold rolling mill 1 and wound and unwound in accordance with the rolling speed of the cold rolling mill 1. It is wound around the device 4 (S1902B → S1104B → S1403B).

  On the other hand, during the low-speed rolling, the second carry-in coil 101b is carried into, attached to, and sent out from the unwinding device 2, and the strip tail end of the first carry-in coil 101a and the strip tip of the second carry-in coil 101b are joined by the joining device 5. Are joined (S1204 → S1205 → S1206 → S1501).

  For example, if a series of operations related to the carrying-in of the second carry-in coil 101b and the joining of the first carry-in coil 101a and the second carry-in coil 101b are performed in about 2 minutes, the strip that is subjected to low speed rolling (10 mpm) during that time 20m, the strip storage device 9 needs to store 20m strips.

  When the first carry-in coil 101a and the second carry-in coil 101b are joined, the unrolled strip of the first carry-in coil 101a is rolled again at the steady rolling speed by the cold rolling mill 1 and then joined second. The strip of the carry-in coil 101 b is rolled at a steady rolling speed by the cold rolling mill 1, and the strip is unwound from the unwinding device 2 in accordance with the rolling speed of the cold rolling mill 1 and taken up by the winding unwinding device 4. In the meantime, a new strip is stored in the strip storage device 9 (S1105 → 1404 → S1207 → S1106 → S1405 → S1903B).

  When the strip of the second carry-in coil 101b is unwound and the tail end of the strip reaches the joining position of the joining device 5 and stops, the strip is discharged from the strip storage device 9, and at the same time, the second carry-in coil 101b is not rolled. The strip is rolled at a low speed by the cold rolling mill 1 and wound on the winding / unwinding device 4 in accordance with the rolling speed of the cold rolling mill 1 (S1904B → S1107B → S1406B).

  On the other hand, during the low-speed rolling, the third carry-in coil 101c is carried into, attached to, and sent out from the unwinding device 2, and the strip tail end of the second carry-in coil 101b and the strip tip of the third carry-in coil 101c are joined by the joining device 5. Are joined (S1208 → S1209 → S1210 → S1502).

  When the second carry-in coil 101c and the third carry-in coil 101c are joined, the unrolled strip of the second carry-in coil 101b is again rolled at the steady rolling speed by the cold rolling mill 1, and subsequently joined to the third The strip of the carry-in coil 101 c is rolled at a steady rolling speed by the cold rolling mill 1, and the strip is unwound from the unwinding device 2 in accordance with the rolling speed of the cold rolling mill 1 and taken up by the winding unwinding device 4. (S1108 → 1407 → S1211 → S1109 → S1408).

  When the strip of the third carry-in coil 101c is unwound, the unwinding device 2 stops, and when the strip tail end of the third carry-in coil 101c reaches just before the cold rolling mill 1, the cold rolling mill 1 stops and the second 1 pass is complete | finished and the winding / unwinding apparatus 4 stops according to the stop of the cold rolling mill 1 (S1212-> S1110-> S1111-> S1409).

  Thereby, the buildup coil 102 is formed in the winding / unwinding device 4 (S1410).

  The operation of the cold-rolled material equipment according to the present embodiment in the second to fourth passes is the same as that of the first embodiment as follows.

<Main effects>
The effect of this embodiment will be described by comparing with the first embodiment.

  In the first embodiment, in the first pass, the second carry-in coil 101b is carried into the unwinding device 2, and a series of the strip tail end of the first carry-in coil 101a and the strip tip end of the second carry-in coil 101b are joined. During the operation (S1204 → S1205 → S1206 → S1501), the cold rolling mill 1 is stopped (S1104). Further, during the series of operations (S1208 → S1209 → S1210 → S1502) in which the third carry-in coil 101c is carried in and the strip tail end of the second carry-in coil 101b and the strip tip of the second carry-in coil 101c are joined. The rolling mill 1 is stopped (S1108).

  When the rolling is stopped, that is, when the rolling speed is 0 mpm, the friction coefficient between the work roll and the strip changes on the surface of the strip sandwiched between the work rolls, thereby generating a stop mark. Furthermore, since the stop mark is also transferred to the work roll, the stop mark may be transferred to the surface of the strip at regular intervals at the rotation pitch of the work roll during subsequent rolling. When this stop mark is generated in the first pass, the stop mark may not be noticeable to a level that cannot be visually observed by continuing rolling a plurality of times. However, when a high quality surface gloss is strictly required, a new problem of being treated as a defective product arises.

  In this embodiment, the strip storage device 9 is provided, and the strip storage device 9 stores the strip except during joining, and the strip stored in the strip storage device 9 is discharged during joining, and the leading coil tail end is stopped. However, by continuing the rolling by low-speed rolling, it is possible to prevent the work roll stop mark from being generated on the strip during the joining operation.

  Furthermore, for example, by setting the rolling speed of low-speed rolling to 10 mpm, if the time required for the joining operation is 2 minutes, the strip storage length can be set to 20 m. As the rolling speed of the low-speed rolling is lowered, the length of the strip stored in the strip storage device can be shortened, and the strip storage device can be made compact. As a result, the equipment configuration can be simplified. Note that the rolling speed can be lowered to the minimum resolution speed (infinitely close to 0) of the cold rolling mill 1.

<Configuration and effects related to thickness control and shape control>
In this embodiment, low-speed rolling is performed during the joining operation or when the coil is divided, but this causes a new problem that the plate thickness control accuracy is lowered and a new issue that the shape control accuracy is lowered. That is, the plate thickness control and shape control are feedback control at the steady rolling speed, but at a low speed, the time delay becomes remarkable and the accuracy decreases.

  The cold rolling mill 1 includes, for example, upper and lower work rolls 11 and 11 that are in direct contact with the rolled material and rolled, upper and lower intermediate rolls 12 and 12 that support these work rolls in the vertical direction, and these intermediate rolls 12 and 12. It is a 6-stage UC mill provided with the upper and lower reinforcement rolls 13 and 13 which support a vertical direction. A hydraulic reduction device 14 is provided below the lower reinforcement roll 13, and the hydraulic reduction device 14 moves the bearing of the lower reinforcement roll 13 up and down based on a command from the control device 20, thereby causing a predetermined reduction. Reduce the strip to volume. A load meter 15 is provided above the upper reinforcing roll 13, and information detected by the load meter 15 is output to the control device 20.

  A thickness meter 16a, a plate speed meter 17a, and a shape meter 18a are provided on the inlet side of the first pass of the cold rolling mill 1, and a thickness meter 16b and a plate speed are provided on the outlet side of the first pass of the cold rolling mill 1. A total meter 17 b and a shape meter 18 b are provided, and information detected by each is output to the control device 20. The plate thickness meter 16 may be a laser Doppler plate speed meter, or may detect the plate speed based on the rotation speed of a deflora or a shape detector.

  The plate thickness control during steady rolling will be described. During steady rolling, BISRA-AGC control and monitor AGC control are used in a timely manner.

  In the BISRA-AGC control, a change in sheet thickness on the inlet side of the cold rolling mill 1 is detected by a load meter 15 as a change in rolling load, and the roll reduction amount is adjusted in accordance with the detected load change. It is.

  Monitor AGC control detects a change in the thickness of the outlet side of the cold rolling mill 1 from the thickness gauge 16b on the outlet side, and feeds back the detected thickness change to adjust the amount of reduction by proportional integral control. It is.

  The thickness gauge 16b is provided a few meters away from the cold rolling mill 1, and a time delay occurs in the detection value of the thickness gauge 16b, but there is almost no influence during steady rolling (for example, 1000 mpm). Absent. However, when applied at the time of low-speed rolling (for example, 10 mpm), appropriate information cannot be obtained due to the influence of time delay, and the plate thickness control accuracy decreases.

  The plate thickness control during low speed rolling will be described. In this embodiment, MF-AGC control is applied to low-speed rolling.

  The MF-AGC control performs the following control. The detection value of the entrance side thickness gauge 16a is tracked to just below the rolling stand to be controlled. The respective plate speeds are detected by using the plate speedometers 17a and 17b on the entry side and the exit side. The control device 20 multiplies the inlet side plate thickness by the inlet side outlet side plate speed ratio to estimate the outlet side plate thickness, and adjusts the reduction so that the deviation between the estimated plate thickness and the target plate thickness becomes zero.

  Since the value detected by the plate thickness meter 16b is not used, the plate thickness control accuracy equivalent to the plate thickness control accuracy during steady rolling can be maintained even during low speed rolling.

  The shape control during steady rolling will be described. At the time of steady rolling, feedback control is applied in which the shape of the strip is measured by the shape meter 18b on the delivery side and corrected based on the deviation between the shape command value and the actual shape value.

  The shape meter 18b is provided several to several tens of meters away from the cold rolling mill 1, and a time delay occurs in the detection value of the shape meter 18b, but it is almost affected when it is in steady rolling (for example, 1000 mpm). There is no. However, when applied at the time of low-speed rolling (for example, 10 mpm), appropriate information cannot be obtained due to the influence of time delay, and the shape control accuracy decreases.

  The plate thickness control during low speed rolling will be described. In this embodiment, roll bender control or coolant control or these are used together.

  The roll vendor control performs the following control. A load meter 15 detects a change in the rolling load of the cold rolling mill 1, and the control device 20 calculates a roll deflection accompanying the change, and applies a force to the end of the work roll 11 or the intermediate roll 12 based on the calculation result. The roll is forcibly bent to control the deflection of the roll.

  The coolant control is as follows. Blocks divided into a predetermined length on the roll surface of the work roll 11 or the intermediate roll 12 are set in advance. The change in rolling load of the cold rolling mill 1 is detected by the load meter 15, and the control device 20 calculates the roll deflection accompanying the change, changes the amount of coolant sprayed for each block based on the calculation result, and performs the rolling process. Controls the amount of expansion of the roll due to heat generation.

  In both controls, the information on the shape meter 18b is not used, so that the plate thickness control accuracy equivalent to the shape control accuracy during steady rolling can be maintained even during low-speed rolling.

  In addition, the structure which concerns on board thickness control and shape control is also provided in 1st Embodiment, and the same control is applied also at the time of the low-speed rolling at the time of dividing the buildup coil 102 by the last pass of 1st Embodiment. Is done.

-Fourth embodiment-
Next, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 20 is a schematic view of a cold rolled material facility according to the second embodiment of the present invention. While the cold rolling mill 1 of the third embodiment has one stand, the cold rolling mills 1a and 1b of the second embodiment have two stands.

  For convenience of explanation, the cold rolling mill 1 according to the third embodiment has one stand. However, in order to maximize the effects of improving the annual production amount and reducing the off-gauge rate, it is assumed that there are two stands. Is preferred. Furthermore, 2 stands are preferable in terms of the cost effectiveness. Other configurations are the same as those of the third embodiment, and the control and operation are also the same, and the same effect can be obtained.

  Furthermore, productivity can further be improved by using the cold rolling mills 1a and 1b as two stands.

1, 1a, 1b Cold rolling mill 2 Unwinding device 3 Winding / unwinding device (first winding / unwinding device)
3A Winding / unwinding device (first winding / unwinding device, solid type)
4 Winding / unwinding device (second winding / unwinding device)
4A Winding / unwinding device (second winding / unwinding device, solid type)
5 Joining device 6, 6a, 6b Cutting device 9 Strip storage device 11 Work roll 12 Intermediate roll 13 Reinforcement roll 14 Hydraulic reduction device 15 Load gauges 16a, 16b Plate thickness gauges 17a, 17b Plate speed gauges 18a, 18b Shape gauge 20 Control device 21 Process computer 51, 52 Electrode wheel 53, 54 Pressure roller 55, 56 Clamp device 57 Carriage frame,
58 Electrode wheel pressing device 59 Pressure roller pressing device 60 Inclination mechanism 61, 62 Shaft core 63 Straight line 64 passing through the center of the pressure roller in the direction perpendicular to the shaft core 64 Contact length portion 71 Rotating shaft 72, 73 Pinion 74 Electric Motor 75 Inclination angle control device 76 Angle sensor 77 Host control device 81 Thrust force 82 Shear force 91 Fixed roller 92 Movable roller 101, 101a-c Carry-in coil 102 Build-up coil 103, 103a-c Carry-out coil 111 Winding-up for build-up coil Unwinding device 112, 113 Winding device

Claims (24)

The unwinding device (2) for unwinding the coil, at least one reversible cold rolling mill (1, 1a, 1b), and the first pass of the cold rolling mill (1, 1a, 1b) The first and second winding / unwinding devices (3, 4) disposed on the side and the unwinding side, respectively, and disposed between the unwinding device (2) and the first winding / unwinding device (3). In the reversible cold rolling method for performing cold rolling of a plurality of passes by changing the rolling direction, using the joining device (5),
The strip of the first coil (101a) unwound from the unwinding device (2) is directly guided to the cold rolling mill (1, 1a, 1b) and rolled, and the second unwinding device (4). Rolling step (S1103)
The second coil (101b) continuously unwound from the tail end of the first coil (101a) and the unwinding device (2) when the tail end of the first coil (101a) reaches the joining device (5). A joining step (S1501) for joining the tips;
Subsequent to the second coil (101b), the rolling step (S1105, S1106, S1108, S1109) and the joining step (S1502) are repeated, and the first pass rolling by the cold rolling mill and the preceding by the joining device. A first-pass coil build-up rolling process (S1101 to S1111, S1201 to S1212, S1401 to S1410, S1501 to S1502) in which a coil tail end and a subsequent coil tip are joined to build up a plurality of coils into one coil. , S1901B to S1904B),
A reversible rolling step (S2101 to S4301, S4306, S4311, S4401 to S4406) in which the built-up coil (102) is subjected to reversible rolling a predetermined number of times until a desired product plate thickness is obtained,
In the final pass of the reversible rolling process, the built-up coil (102) is divided by a cutting device (6a, 6b) and wound around one of the first and second winding / unwinding devices (3, 4). A reversible cold rolling method comprising: a split winding step (S4302 to S4304, S4307 to S4309, S4312 to S4314, S4601 to S4603) for forming a plurality of coils (103a to c). In the reversible cold rolling method according to claim 1,
A strip storage device (9) is provided between the cold rolling mill (1, 1a, 1b) and the joining device (5), and the leading coil tail and the trailing coil in the joining step (S1501, S1502, S1901B to S1904B). A reversible cold rolling method, wherein a rolling speed during joining with the tip is set to more than 0 mpm and not more than 50 mpm. In the reversible cold rolling method according to any one of claims 1 to 2,
In the divided winding step (S4302 to S4304, S4307 to S4309, S4312 to S4314, S4601 to S4603), the rolling speed when dividing the coil (102) in the final pass is more than 0 mpm and 50 mpm or less. A reversible cold rolling method. In the reversible cold rolling method according to any one of claims 1 to 3,
In the joining step (S1501, S1502, S1901B to S1904B) and the split winding step (S4302 to S4304, S4307 to S4309, S4312 to S4314, S4601 to S4603), the cold rolling mill (1, 1a, 1b) is inserted. The side rolling speed, the inlet side sheet thickness, and the outlet side rolling speed are measured, and based on these measured values, the sheet thickness directly under the work roll of the cold rolling mill (1, 1a, 1b) is calculated, and the cold rolling mill A reversible cold rolling method, characterized in that a plate thickness is controlled to a desired plate thickness by a hydraulic reduction device (14) included in (1, 1a, 1b). In the reversible cold rolling method according to any one of claims 1 to 4,
In the joining step (S1501, S1502, S1901B to S1904B) and the split winding step (S4302 to S4304, S4307 to S4309, S4312 to S4314, S4601 to S4603), rolling of the cold rolling mill (1, 1a, 1b) A reversible cold rolling method characterized in that the strip shape is controlled by roll bender control and / or coolant control based on a roll deflection calculation result due to load fluctuation. In the reversible cold rolling method according to any one of claims 1 to 5,
Prior to the rolling step (S1101), the order of the coils carried into the unwinding device (2) is adjusted in advance so that the absolute value of the difference in plate thickness between the preceding coil and the succeeding coil is 1 mm or less. A reversible cold rolling method. In the reversible cold rolling method according to any one of claims 1 to 6,
In the joining step (S1501, S1502), a reversible cold rolling method comprising joining using a mash seam welding type joining device as the joining device (5). In the reversible cold rolling method according to claim 7,
A reversible cold rolling method comprising performing a cross swaging process immediately after joining by the mash seam welding type joining device (5). In the reversible cold rolling method according to any one of claims 1 to 8,
In the coil build-up rolling step (S1101 to S1502, S1901B to S1904B), the outer diameter of the coil that has been built-up is φ3000 mm or less. In the reversible cold rolling method according to any one of claims 1 to 9,
A reversible cold rolling method characterized in that the tension of the strip when the outer diameter of the coil is large is compared with the tension of the strip when the outer diameter of the coil is small, and is gradually set lower. In the reversible cold rolling method according to any one of claims 1 to 10,
In the reversible rolling step (S2101 to S4109) and the coil buildup rolling step (1101 to 1111), rolling is performed using a two-stand cold rolling mill (1a, 1b) as the cold rolling mill. Reversible cold rolling method. In the reversible cold rolling method according to any one of claims 1 to 11,
The reversible cold rolling method characterized in that, in the divided winding step (S4601 to S4603), the coil is cut in the final pass immediately after the joint passes through the cutting device (6a, 6b) . In the reversible cold rolling method according to claim 12,
In the parting and winding step (S4601 to S4603), the coil parting in the final pass is performed immediately before the joining part passes through the cutting device (6a, 6b) and the joining part passes through the cutting device (6a, 6b) . A reversible cold rolling method characterized in that it is performed immediately after. In the reversible rolling method according to any one of claims 1 to 13,
In the divided winding step (S4601 to S4603), before starting the rolling of the final pass, the work roll is changed to a dull weight work roll in a state where the strip is passed, and the rolling of the final pass is performed. Reversible cold rolling method. The unwinding device (2) for unwinding the coil, at least one reversible cold rolling mill (1, 1a, 1b), and the inlet side and the outlet side of the first pass of the cold rolling mill, respectively. First and second winding / unwinding devices (3, 4), and a joining device (5) disposed between the unwinding device (2) and the first winding / unwinding device (3). In reversible cold rolling equipment that performs cold rolling of multiple passes by changing the rolling direction,
The strip of the first coil (101a) unwound from the unwinding device (2) is directly guided to the cold rolling mill (1, 1a, 1b) and rolled, and the second unwinding device (4). Rolled up
When the tail end of the first coil (101a) reaches the joining device (5), the second coil (101b) continuously unwound from the tail end of the first coil (101a) and the unwinding device (2). ) Join the tip,
Subsequently, the rolling and joining after the second coil (101b) are repeated, the first pass rolling by the cold rolling mill (1, 1a, 1b), the leading coil tail end and the trailing by the joining device (5). Join to the coil tip, build up multiple coils into one coil,
The coil (102) built up in the cold rolling mill (1, 1a, 1b) is subjected to reversible rolling a predetermined number of times until a desired product plate thickness is obtained,
The coil (102) built up in the final pass of reversible rolling is divided by a cutting device (6a, 6b) and wound on one of the first and second winding / unwinding devices (3, 4), To form a plurality of coils (103a-c),
The unwinding device (2), the cold rolling mill (1, 1a, 1b), the first and second unwinding / unwinding devices (3, 4), the joining device (5) and the cutting device (6a). , 6b) is provided with a control device (20) for reversible cold rolling equipment. In the reversible cold rolling equipment according to claim 15,
A reversible cold rolling facility, wherein a strip storage device (9) is disposed between the joining device (5) and the cold rolling mill (1, 1a, 1b). In the reversible cold rolling equipment according to claim 16,
A reversible cold rolling facility characterized in that the strip storage length of the strip storage device (9) is more than 0 m and not more than 100 m. In the reversible cold rolling equipment according to any one of claims 15 to 17,
The control device (20) is configured to determine a rolling speed of the cold rolling mill (1, 1a, 1b) during coil joining by the joining device (5) and at the time of coil division by the cutting device (6a, 6b) . A reversible cold rolling facility characterized by being controlled to exceed 0 mpm and not more than 50 mpm. In the cold rolling apparatus according to any one of claims 15 to 18,
The control device (20) is, during coil joining by the joining device (5) and at the time of coil cutting by the cutting device (6a, 6b) , the entry-side rolling speed of the cold rolling mill (1, 1a, 1b), And the inlet side sheet thickness and the outlet side rolling speed are measured, and based on these measured values, the sheet thickness directly under the work roll of the cold rolling mill (1, 1a, 1b) is calculated, and the hydraulic pressure of the cold rolling mill A reversible cold rolling apparatus characterized in that a plate thickness is controlled by a reduction device (14) so as to obtain a desired plate thickness. The cold rolling apparatus according to any one of claims 15 to 19,
The control device (20) is based on fluctuations in rolling load of the cold rolling mill (1, 1a, 1b) during coil joining by the joining device (5) and at the time of coil cutting by the cutting device (6a, 6b). A reversible cold rolling apparatus characterized in that the strip shape is controlled by roll bender control or coolant control or both of the control based on a roll deflection calculation result. The cold rolling apparatus according to any one of claims 15 to 20,
The control device (20) compares the tension of the strip when the coil outer diameter is large with the tension of the strip when the coil outer diameter is small during the first pass coil build-up rolling and the subsequent reversible rolling. And a reversible cold rolling apparatus characterized by being set low. In the cold rolling apparatus according to any one of claims 15 to 21,
A reversible cold rolling apparatus characterized in that the cold rolling mill (1a, 1b) has two stands. In the reversible rolling equipment according to any one of claims 15 to 22,
A reversible cold rolling facility, wherein the joining device (5) is a mash seam welder. In the reversible cold rolling equipment according to claim 23,
The mash seam welder of the joining device (5) includes a swaging roller (53) having a mechanism (60) for inclining the swaging roller axis with respect to a horizontal plane perpendicular to the joining line. Type cold rolling equipment.

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