JP5928055B2 - Rolled material width control device and rolled material width control method - Google Patents

Description

  The present invention relates to a rolled material width control device and a rolled material width control method for controlling the width of a rolled metal material (hereinafter referred to as a rolled material) such as a steel material.

  Conventionally, the width of a material to be rolled is controlled in a hot rolling line. Generally, in a hot rolling line, a heating furnace for heating a material to be rolled, a width press device (hereinafter referred to as a sizing press device) for reducing the width of the material to be rolled, a rough rolling device, a finish rolling device, etc. Various devices are installed. The width of the material to be rolled is aggregated for each product request width by a sizing press device, and then controlled mainly by rough rolling of the material to be rolled by a rough rolling device.

  Specifically, the material to be rolled is heated by a heating furnace, extracted from the heating furnace, and conveyed to a sizing press apparatus. The sizing press apparatus width-presses the material to be rolled in response to product requirements, thereby reducing the width of the material to be rolled. Thus, the material to be rolled that has been reduced in width (that is, killed) by the sizing press apparatus is conveyed to the rough rolling apparatus and rough rolled by the rough rolling apparatus. Here, the rough rolling apparatus includes a plurality of rolling rolls for performing a rolling process in the thickness direction of the material to be rolled (hereinafter referred to as a horizontal rolling process), and a plurality of rolling processes for performing a rolling process in the width direction of the material to be rolled. A vertical roll (hereinafter referred to as an edger roll). The material to be rolled is horizontally rolled by a plurality of rolling rolls while being reduced in width by a plurality of edger rolls. By such rough rolling in the width direction and thickness direction of the material to be rolled, the width of the material to be rolled is controlled to be reduced in consideration of the amount of width to be stretched during finish rolling. Thereafter, the finish rolling apparatus finish-rolls the material to be rolled after the rough rolling process in response to the product request.

  However, in the horizontal rolling process, the front end portion of the material to be rolled extends in the width direction of the material to be rolled, and is larger than the amount of stretching in the width direction and extends in the longitudinal direction of the material to be rolled. Due to this, the width of the tip of the material to be rolled tends to be narrower after rolling (particularly after rough rolling) than the center of the material to be rolled. This phenomenon may cause a situation (hereinafter referred to as “width minus”) in which a narrow width portion is generated in the material to be rolled or the finished rolled plate after the finish rolling process as compared with the required width of the rolled plate.

  As a countermeasure against the negative width described above, generally, in a hot rolling line, a short stroke processing of a tip portion of a material to be rolled is performed by a sizing press device (see Patent Documents 1 and 2). Alternatively, a method of lowering the tension of the material to be rolled during finish rolling (see Patent Document 3) and a method of automatically controlling the width of the material to be rolled using an edger roll (see Patent Documents 4 and 5) are adopted. Has been. In addition, short stroke processing refers to changing the opening of the width press die of the sizing press device to width-press the tip of the material to be rolled, and thereby the tip of the material to be rolled to the center of the material to be rolled. This is a process of forming wider than that.

JP 2010-75977 A JP 2010-64123 A JP 2006-51512 A Japanese Patent Laid-Open No. 2005-34875 JP 2004-237346 A

  However, in the above-described prior art, it is difficult to completely correct the steep and excessive width minus once generated in the material to be rolled, and as a result, it is required in the rolled plate after finish rolling. As a result, a narrow width portion (hereinafter referred to as a width minus portion) remains in comparison with the rolled product width. The steep and excessive width minus means that the gradient of the width reduction amount of the material to be rolled with respect to the displacement amount in the direction perpendicular to the width direction of the material to be rolled (longitudinal direction of the material to be rolled) is steep and rolling. A state in which the width of the material to be rolled is excessively low compared to the width required for the product.

  Since the rolled plate including the width minus portion as described above is a defective product that does not satisfy the plate width required as a rolled product, it cannot be shipped as a product and is discarded. For this reason, there is a problem that not only the waste loss of the material to be rolled increases, but also the yield of the rolled product decreases. Furthermore, since it takes unnecessary time and labor to remove the material to be rolled or the rolled plate including the minus width portion from the production line, there is a problem that the production efficiency of the rolled product is lowered.

  In addition, the problem mentioned above becomes obvious with the increase in the width reduction amount (namely, width killing amount) of the material to be rolled by the sizing press apparatus. For example, when the width killing amount of the material to be rolled is 100 [mm] or more, even if automatic width control using an edger roll is performed on the material to be rolled, not only the above-described problem cannot be solved. As a result, shrinkage occurs in the material to be rolled. This is the same even if the tension during finish rolling of the material to be rolled is lowered. In addition, narrowing is a phenomenon in which the width of the material to be rolled becomes narrow due to the tension during rolling.

  Moreover, the above-described problem becomes apparent as the width of the rolled product to be manufactured increases. For example, the coil width of a rolled product (hereinafter referred to as a coil) obtained by winding a rolled plate after finish rolling into a coil shape is 1700 [mm] or more, and the width killing amount at the time of manufacturing the coil is 150 [mm]. ] If this is the case, the width minus portion remains in this coil.

  In recent years, the widths of rolled plates or coils required as rolled products have been diversified, such as 1700 [mm] or more, 1200 to 1700 [mm], and less than 1200 [mm]. For this reason, in the manufacture of rolled products, it is possible to prevent the occurrence of negative width on the rolled material and the rolled sheet after finish rolling, regardless of the increase or decrease in the width of the rolled material or the required width of the rolled product. Thus, it is extremely important to make the widths of various rolled products uniform over the entire length.

  The present invention has been made in view of the above circumstances, and can prevent a negative width from being generated in the material to be rolled and the rolled sheet after finish rolling, thereby producing a width required for the rolled product. An object of the present invention is to provide a rolled material width control device and a rolled material width control method capable of improving the width accuracy of a subsequent rolled product and making the width of the rolled product uniform over the entire length.

  In order to solve the above-described problems and achieve the object, a rolled material width control device according to the present invention presses a mold from both sides in the width direction of the rolled material to the rolled material, and the rolled material. In the rolled material width control device that controls the width of the material to be rolled using a width press device that performs a width press of the material, the material to be rolled is based on the conveyance amount of the material to be rolled for each width press. It is determined whether or not the leading end of the rolled material protrudes from the exit side of the width press device, and the mold corresponds to the width of the rolled material during the period in which the leading end of the rolled material is located in the width press device. The width pressing device is controlled so as to perform width pressing of the material to be rolled while adjusting the opening of the material, and the mold is opened during a period in which the tip of the material to be rolled protrudes to the exit side of the width pressing device. The width of the material to be rolled is changed at different degrees, and the direction from the front end side to the tail end side of the material to be rolled is changed. Wherein as the width of the rolled material to form a multiple stepped portion decreases to the target width of the material being rolled I, and further comprising a control unit for controlling the width pressing device.

  The rolled material width control device according to the present invention is characterized in that, in the above invention, the control unit controls the width press device so as to form the two stepped portions.

  The rolled material width control device according to the present invention is characterized in that, in the above invention, the control unit controls the width press device so that each step of the plurality of step portions is the same. .

  The rolled material width control method according to the present invention uses a width press device that performs a width press of the rolled material by pressing a mold from both sides in the width direction of the rolled material to the rolled material. In the rolled material width control method for controlling the width of the rolled material, the opening degree of the mold corresponding to the width of the rolled material during a period in which the tip of the rolled material is located in the width press device The width press of the material to be rolled is performed by changing the opening of the mold during the period when the tip of the material to be rolled protrudes to the exit side of the width press device. And forming a plurality of stepped portions in the rolled material in which the width of the rolled material decreases to the target width of the rolled material from the front end side to the tail end side of the rolled material. To do.

  Further, the rolled material width control method according to the present invention is characterized in that, in the above invention, the two stepped portions are formed in the rolled material.

  In addition, the rolled material width control method according to the present invention is characterized in that, in the above invention, the steps of the plurality of stepped portions are made the same.

  According to the present invention, it is possible to prevent a negative width from occurring in the material to be rolled and the rolled sheet after finish rolling, thereby improving the width accuracy of the rolled product after manufacture with respect to the width required for the rolled product. There is an effect that the width of the rolled product can be made uniform over its entire length.

FIG. 1 is a block diagram showing a configuration example of a material width control apparatus for rolled material according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing a configuration example of the sizing press apparatus in the present embodiment. FIG. 3 is a schematic diagram showing an example of a material to be rolled that has been killed by a sizing press apparatus. FIG. 4 is a schematic diagram for explaining the first pass width reduction step in the material width control method. FIG. 5 is a schematic diagram for explaining the width reduction process of the second pass in the material width control method. FIG. 6 is a schematic diagram for explaining the width reduction process of the third pass in the material width control method. FIG. 7 is a schematic diagram for explaining the fourth pass width reduction step in the material width control method. FIG. 8 is a schematic diagram for explaining the width reduction process of the fifth pass in the material width control method. FIG. 9 is a schematic diagram for explaining the width reduction process of the sixth pass in the material width control method. FIG. 10 is a schematic diagram for explaining the width reduction process of the seventh pass in the material width control method. FIG. 11 is a diagram showing an example of the width measurement result of the rolled sheet according to the example of the present invention. FIG. 12 is a diagram illustrating an example of the width measurement result of the rolled sheet of Comparative Example 1 with respect to the Example of the present invention. FIG. 13: is a figure which shows an example of the width measurement result of the rolled sheet of the comparative example 2 with respect to the Example of this invention. FIG. 14 is a diagram illustrating an example of the width measurement result of the rolled sheet of Comparative Example 3 with respect to the Example of the present invention.

  Exemplary embodiments of a material width control apparatus and material width control method according to the present invention will be described below in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiment.

(Embodiment)
FIG. 1 is a block diagram showing a configuration example of a material width control apparatus for rolled material according to an embodiment of the present invention. The rolled material width control device 1 according to the present embodiment is a device that controls the width of the rolled material 20 using the sizing press device 13 of the hot rolling line 10 illustrated in FIG. The hot rolling line 10 includes a heating furnace 11 for heating the material 20 to be rolled, a conveying device 12 for conveying the material 20 to be rolled, and a width press for reducing the width of the material 20 to be rolled. A sizing press device 13 to perform, a rough rolling device 14 for rough rolling the material 20 to be rolled, a finish rolling device 15 for finish rolling the material 20 to be rolled after the rough rolling, and a rolling manufactured by finish rolling. A coiler 16 that winds the plate 25 in a coil shape is installed. Moreover, in the hot rolling line 10, the front-end | tip of the to-be-rolled material 20 is the edge part by the side of the head of the to-be-rolled material 20 conveyed toward the conveyance direction (refer thick line arrow of FIG. 1) of the to-be-rolled material 20. . The tail end of the material 20 to be rolled is the end opposite to the tip.

  As shown in FIG. 1, the rolled material width control device 1 controls the rolled material width, the input unit 2 for inputting various information, the display unit 3 for displaying information related to the control of the rolled material width, and the like. An arithmetic processing unit 4 that performs various arithmetic processes for realizing and a control unit 5 that controls the width of the material to be rolled are provided.

  The input unit 2 is realized using an input device such as a keyboard and a mouse, and inputs various types of information to the control unit 5 in response to an input operation by the operator. The input information by the input unit 2 includes, for example, instruction information for instructing the control unit 5 to start or stop the width control of the material to be rolled, information on the equipment specifications of the sizing press device 13, and the like.

  The display unit 3 displays various information instructed to be displayed by the control unit 5. Specifically, the display unit 3 displays various information useful for control of the material width to be rolled, such as information input by the input unit 2 and a calculation processing result related to control of the material width of the material to be rolled.

  The arithmetic processing unit 4 performs various arithmetic processes necessary for controlling the width of the material to be rolled using the sizing press device 13. Specifically, every time the slab-shaped rolled material 20 is introduced into the entry side end of the hot rolling line 10, the arithmetic processing unit 4 obtains order information 9 a regarding the product requirements of the loaded rolled material 20. Obtained from the management database 9. The arithmetic processing unit 4 associates the material to be rolled 20 with the order information 9a, and calculates a width reduction amount suitable for the material to be rolled 20 based on the order information 9a. In addition, this width reduction amount is the pressing amount of the press work (namely, width press) which shrinks the to-be-rolled material 20 in the width direction with the sizing press apparatus 13. The arithmetic processing unit 4 transmits an electrical signal indicating the obtained width reduction amount to the control unit 5 every time the width reduction amount is calculated.

  Here, the management database 9 is a database for managing the material to be rolled 20 of the hot rolling line 10 in response to various product requests, and stores order information 9a of the material to be rolled 20. The order information 9a is the specifications of the material to be rolled necessary for producing the requested steel product. For example, as the specifications of the material 20 to be rolled in the order information 9a, the composition of the material 20 to be rolled, the metal type such as the steel type, the strength, the slab dimensions (thickness and width, etc.), the weight, the material to be rolled after the rolling process Dimension (length, thickness, width) etc. are mentioned. The management database 9 provides the arithmetic processing unit 4 with order information 9a corresponding to the input material 20 to be rolled every time the material 20 is input to the entry end of the hot rolling line 10.

  The control part 5 is implement | achieved using the memory etc. which memorize | store the program for implement | achieving the function of the to-be-rolled material width control apparatus 1, etc., CPU etc. which run the program in this memory. The control part 5 controls each operation | movement of each structure part of the to-be-rolled material width control apparatus 1, ie, the input part 2, the display part 3, and the arithmetic processing part 4, and is an electric signal with these each structure part Control the input and output of.

  Further, the control unit 5 controls the sizing press device 13 in order to control the width of the material 20 to be rolled. Specifically, the control unit 5 acquires the equipment specification of the sizing press device 13 input by the input unit 2, and based on this equipment specification, the tip of the material 20 to be rolled is the entry side of the sizing press device 13. It grasps | ascertains the conveyance amount of the to-be-rolled material 20 required in order to displace from a delivery side. In addition, the control unit 5 acquires the conveyance amount of the material 20 to be rolled for each width press of the material 20 to be rolled by the sizing press device 13 from the conveyance device 12. The control unit 5 grasps the position of the material 20 to be rolled in the sizing press device 13 based on the acquired conveyance amount of the material 20 to be rolled, and the leading end of the material 20 to be rolled is the exit side of the sizing press device 13. Judge whether it protruded from. As a result of this determination processing, when the tip of the material 20 to be rolled is located in the sizing press device 13, the control unit 5 adjusts the mold opening of the sizing press device 13 according to the width of the material 20 to be rolled. However, the sizing press device 13 is controlled so as to perform the width press of the material 20 to be rolled. On the other hand, when the tip of the material 20 to be rolled protrudes to the exit side of the sizing press device 13, the control unit 5 changes the above-described mold opening to perform the width press of the material 20 to be rolled. 13 is controlled. Accordingly, the control unit 5 controls the sizing press device 13 so as to form a plurality of wide stepped portions on the tip side of the material 20 to be rolled. The control unit 5 acquires the width reduction amount used for the control of the sizing press device 13 described above from the arithmetic processing unit 4.

  Next, a schematic configuration of the hot rolling line 10 having the sizing press device 13 controlled by the above-described rolled material width control device 1 will be described with reference to FIG. As described above, the hot rolling line 10 is provided with the heating furnace 11, the conveying device 12, the rough rolling device 14, the finish rolling device 15, and the coiler 16.

  The heating furnace 11 heats the material 20 to be rolled, and puts the material 20 after the heat treatment into the conveying device 12. The conveyance apparatus 12 is implement | achieved using the some conveyance roll 12a etc., and conveys the to-be-rolled material 20 along the conveyance direction (for example, longitudinal direction of the to-be-rolled material 20) shown in FIG. Specifically, the conveying device 12 conveys the material 20 to be rolled extracted from the heating furnace 11 to the sizing press device 13. Next, the conveying device 12 conveys the material 20 to be rolled from the entry side to the exit side of the sizing press device 13 by a predetermined conveyance amount for each width press by the sizing press device 13. Thereafter, the conveying device 12 conveys the material 20 to be rolled after the width pressing from the sizing press device 13 to the rough rolling device 14.

  The sizing press device 13 functions as a width press device that performs a width press to reduce the material 20 to be rolled in the width direction. Specifically, after the conveying device 12 conveys the material to be rolled 20 to the entry side of the sizing press device 13, the sizing press device 13 is transferred each time the conveying device 12 conveys the material 20 to be rolled by a predetermined conveyance amount. A width press of the width reduction amount instructed by the control unit 5 is performed on the material 20 to be rolled. That is, the sizing press device 13 intermittently width-presses the material 20 to be rolled a plurality of times from the tip to the tail.

  The rough rolling device 14 includes a plurality of stands of a rough rolling mill 14a and a plurality of edger rolls 14b. The rough rolling mill 14a performs rough rolling on the material 20 to be rolled in the thickness direction using a rolling roll that is paired in the thickness direction of the material 20 to be rolled. The edger rolls 14b are arranged so as to make a pair in the width direction of the material 20 to be rolled, and roll the material 20 to be rolled in the width direction. The rough rolling device 14 performs rolling in the width direction with the pair of edger rolls 14b on the material 20 to be rolled conveyed from the sizing press device 13 by the conveying device 12, and then in the thickness direction by the rough rolling machine 14a. Rough rolling is performed. The rough rolling device 14 uses a plurality of stands of rough rolling mills 14a and a plurality of edger rolls 14b, and the width of the material 20 to be rolled as described above continuously from the tip to the tail of the material 20 to be rolled. The direction rolling process and the thickness direction rough rolling process are sequentially repeated.

  The finish rolling device 15 is realized by using a multi-stand finish mill 15a. The finish rolling device 15 receives the material 20 to be rolled sent from the rough rolling device 14, and finish-rolls the accepted material 20 to be rolled. In this case, the finish rolling device 15 uses a plurality of stand finish rolling mills 15a to finish-roll the to-be-rolled material 20 in the thickness direction continuously from the tip of the to-be-rolled material 20 to the tail end. Thus, the finish rolling device 15 manufactures a rolled plate 25 having a thickness required as a rolled product. The rolled plate 25 sent out from the finish rolling device 15 is wound into a coil by the coiler 16.

  Next, the configuration of the sizing press apparatus 13 shown in FIG. 1 and the material 20 to be rolled after width killing by the sizing press apparatus 13 will be described. FIG. 2 is a schematic diagram showing a configuration example of the sizing press apparatus in the present embodiment. FIG. 3 is a schematic diagram showing an example of a material to be rolled that has been killed by a sizing press apparatus.

  As shown in FIG. 2, the sizing press device 13 includes a pair of dies 100a and 100b and a width reduction device 103a that reduces the dies 100a and 100b in the width direction of the material 20 (hereinafter referred to as width reduction). , 103b.

  The pair of dies 100a and 100b are press dies for width-pressing the material 20 to be rolled in the width direction. The mold 100a has a parallel portion 101a that is parallel to the width press surface of the material 20 to be rolled and a conveyance direction of the material 20 (see the thick arrow in FIG. 2), and the parallel portion 101a. And an inclined portion 102a that is an inclined surface. Similarly, the mold 100b includes a parallel portion 101b that is a surface parallel to the conveyance direction of the material 20 to be rolled, and a surface that is inclined with respect to the parallel portion 101b. And an inclined portion 102b. As shown in FIG. 2, the pair of molds 100a and 100b is arranged so that the parallel portion 101a and the parallel portion 101b face each other and the inclined portion 102a and the inclined portion 102b face each other.

  Here, the end portions on the inclined portions 102a and 102b side of the molds 100a and 100b are located on the entry side of the sizing press device 13, and the end portions on the parallel portions 101a and 101b side of the molds 100a and 100b are positioned on the sizing press. Located on the exit side of the device 13. The material 20 to be rolled is conveyed into the gap between the molds 100a and 100b from the entry side of the sizing press device 13 by the rotating action of a plurality of conveying rolls 12a arranged along the conveying direction as shown in FIG. It passes through this gap along the transport direction. Thereafter, the material 20 to be rolled is conveyed to the exit side of the sizing press device 13 through the gap between the molds 100a and 100b by the rotating action of the plurality of conveying rolls 12a.

  In such an arrangement state of the molds 100a and 100b, the parallel portions 101a and 101b are parallel to each other. The inclined portions 102a and 102b are inclined so as to narrow the gap between the molds 100a and 100b continuously from the entry side of the sizing press device 13 toward the parallel portions 101a and 101b.

  As shown in FIG. 2, the width reduction devices 103a and 103b move the molds 100a and 100b apart from or close to each other along the width direction of the material 20 to be rolled, and thereby the gap distance between the molds 100a and 100b, that is, Adjust the opening. In addition, the width reduction devices 103a and 103b bring the molds 100a and 100b close to each other along the width direction of the material to be rolled 20 every time the material to be rolled 20 is conveyed by a predetermined conveyance amount by the rotating action of the conveying roll 12a. Let Accordingly, the width reduction devices 103a and 103b intermittently reduce the width of the molds 100a and 100b with respect to the material 20 to be rolled. In addition, each operation | movement of such a width reduction apparatus 103a, 103b is performed synchronizing with each other. Further, the amount of width reduction of the molds 100a and 100b by the width reduction devices 103a and 103b is controlled by the control unit 5 of the material width control device 1 to be rolled shown in FIG.

  The sizing press device 13 having the above-described configuration performs width press (width killing) on the material 20 to be rolled based on the control of the control unit 5 of the material width control device 1. As a result, the sizing press device 13 forms the material 20 to be rolled having a width W1 as shown in FIG. 2 into a shape that gradually decreases in width from the front end side toward the tail end side.

  Specifically, as shown in FIG. 3, the material to be rolled 20 that has been width-pressed by the sizing press device 13 includes a wide portion 21 whose width changes stepwise along the longitudinal direction of the material 20 to be rolled, and a constant width. And a stationary portion 22 having a width W3.

  The wide portion 21 is a wide portion having a width W2 that is smaller than the width W1 of the material 20 to be rolled before width pressing and larger than the width W3 of the stationary portion 22, It is formed in the region from the tip 20a to the stationary part 22. Further, as shown in FIG. 3, two step portions 21a and 21b having the same step Δa are formed on both sides of the wide portion 21 in the width direction. The width W2 of the wide portion 21 decreases stepwise from the tip 20a toward the steady portion 22 by these two step portions 21a and 21b. Specifically, the wide portion 21 has a width W2 in a region from the tip 20a to the step portion 21a of the material 20 to be rolled, and a width (W2-2 ×) in a region from the step portion 21a to the step portion 21b. Δa). The wide portion 21 is continuous with the steady portion 22 through the step portion 21b. That is, the width (W2-4 × Δa) of the boundary portion between the wide portion 21 and the steady portion 22 is the same as the width W3 of the steady portion 22.

  The steady portion 22 is a portion having a certain width W3, and is formed in a region of the rolled material 20 from the end on the stepped portion 21b side to the tail end 20b in the wide portion 21. The width W3 of the steady portion 22 is a target width of the material 20 to be rolled after the width pressing by the sizing press device 13, and the amount of stretching t (widthwise direction) of the material 20 to be rolled by finish rolling or the like described above. (Elongation allowance). That is, the width W3 is obtained by subtracting the stretching amount t from the width of the rolled plate 25 (see FIG. 1) required as a rolled product. Note that the width W3 of the steady portion 22 is determined by order information 9a (for example, rolling conditions) corresponding to the material 20 to be rolled.

  In order to form the rolled material 20 having the shape as shown in FIG. 3 in the sizing press device 13, the control unit 5 (see FIG. 1) of the rolled material width control device 1 performs the rolled material 20 in the sizing press device 13. The width reduction amount of the molds 100a and 100b is controlled in accordance with the transfer position. That is, the control unit 5 adjusts the opening degree of the molds 100a and 100b (see FIG. 2) in accordance with the width of the material to be rolled 20 during the period in which the tip 20a of the material 20 to be rolled is located in the sizing press device 13. However, the sizing press device 13 is controlled so as to perform a width press of a predetermined width reduction amount. Then, the control part 5 changes the opening degree of metal mold | die 100a, 100b, and performs the width press of the to-be-rolled material 20 in the period when the front-end | tip 20a of the to-be-rolled material 20 protruded to the exit side of the sizing press apparatus 13. The sizing press device 13 is controlled. That is, the control unit 5 performs control for increasing the width reduction amount of the molds 100a and 100b with respect to the material 20 to be rolled 20 (hereinafter referred to as short stroke control) to the sizing press device 13. As a result, the control unit 5 includes a plurality of stepped portions in which the width of the material 20 to be rolled decreases from the tip 20a side to the tail end 20b side of the material 20 to the target width of the material 20 to be rolled 20. The sizing press device 13 is controlled so as to be formed as follows. For example, the control unit 5 controls the sizing press device 13 so as to form the two stepped portions 21a and 21b shown in FIG. At the same time, the control unit 5 controls the width reduction amount of the molds 100a and 100b so that the steps of the two step portions 21a and 21b are the same.

  Next, a material width control method according to the embodiment of the present invention will be described. 4-10 is a schematic diagram for demonstrating the to-be-rolled material width control method concerning embodiment of this invention. FIG. 4 is a schematic diagram for explaining the first pass width reduction step in the material width control method. FIG. 5 is a schematic diagram for explaining the width reduction process of the second pass in the material width control method. FIG. 6 is a schematic diagram for explaining the width reduction process of the third pass in the material width control method. FIG. 7 is a schematic diagram for explaining the fourth pass width reduction step in the material width control method. FIG. 8 is a schematic diagram for explaining the width reduction process of the fifth pass in the material width control method. FIG. 9 is a schematic diagram for explaining the width reduction process of the sixth pass in the material width control method. FIG. 10 is a schematic diagram for explaining the width reduction process of the seventh pass in the material width control method.

  The width reduction step is a step of width-pressing the material 20 to be rolled by reducing the width of the molds 100a and 100b of the sizing press apparatus 13 shown in FIG. The number of passes is the number of times of width reduction process, that is, the number of times of width reduction of the molds 100a and 100b.

  In the rolled material width control method according to the present embodiment, a sizing press that performs width pressing of the rolled material 20 by reducing the width of the molds 100a and 100b from both sides of the rolled material 20 in the width direction to the rolled material 20. The width | variety of the to-be-rolled material 20 is controlled using the apparatus 13 (refer FIG. 2). That is, during the period in which the tip 20a of the material 20 to be rolled is located in the sizing press device 13, the width of the material 20 to be rolled is adjusted while adjusting the opening degree of the molds 100a, 100b corresponding to the width of the material 20 to be rolled. Do. Thereafter, during the period in which the tip 20a of the material 20 to be rolled protrudes to the exit side of the sizing press device 13, the width of the material 20 to be rolled is changed by changing the opening degree of the molds 100a, 100b. Thus, a plurality of step portions in which the width of the material to be rolled 20 decreases to the target width of the material to be rolled 20 from the tip 20 a side to the tail end 20 b side of the material to be rolled 20 is formed on the material to be rolled 20.

  Specifically, the sizing press device 13 firstly molds 100a and 100b corresponding to the width W1 of the material 20 to be rolled based on the control of the control unit 5 (see FIG. 1) of the material width control device 1 to be rolled. Adjust the opening. Next, as shown in FIG. 4, the material to be rolled into the gaps of the molds 100 a and 100 b from the inclined parts 102 a and 102 b side of the molds 100 a and 100 b (that is, the entrance side of the sizing press device 13) along the conveyance direction. 20 is entered. At this time, the tip 20a of the material 20 to be rolled is located in the gap (inside the sizing press device 13) between the inclined portions 102a and 102b of the molds 100a and 100b. The sizing press device 13 intermittently performs the width reduction of the molds 100a and 100b having the width reduction amount instructed by the control unit 5 for one pass (width reduction step in the first pass). As a result, as shown in FIG. 4, the material 20 to be rolled is intermittently width-pressed by the inclined portions 102a and 102b of the molds 100a and 100b.

  Next, the sizing press device 13 adjusts the opening degree of the molds 100a and 100b corresponding to the width W1 of the material 20 to be rolled, based on the control of the control unit 5, and within the gap between the molds 100a and 100b. The material 20 to be rolled is sequentially entered. At this point, the tip 20a of the material 20 to be rolled is located in the gap (in the sizing press device 13) between the parallel portions 101a and 101b of the molds 100a and 100b, as shown in FIG. In this case, the sizing press device 13 intermittently performs the width reduction of the molds 100a and 100b having the width reduction amount instructed by the control unit 5 for one pass, similarly to the width reduction process of the first pass described above. (2nd pass width reduction step). As a result, as shown in FIG. 5, the material 20 to be rolled is intermittently width-pressed by the inclined portions 102a and 102b and the parallel portions 101a and 101b of the molds 100a and 100b.

  Further, the sizing press device 13 adjusts the opening degree of the molds 100a and 100b corresponding to the width W1 of the material to be rolled 20 based on the control of the control unit 5, and puts the object in the gap between the molds 100a and 100b. The rolled material 20 is sequentially entered. At this time, the tip 20a of the material 20 to be rolled is located in the vicinity of the ends of the parallel portions 101a and 101b of the molds 100a and 100b (in the sizing press device 13), as shown in FIG. In this case, the sizing press device 13 intermittently performs the width reduction of the molds 100a and 100b having the width reduction amount instructed by the control unit 5 for one pass, similarly to the width reduction process of the second pass described above. (3rd pass width reduction step). As a result, as shown in FIG. 6, the material 20 to be rolled is intermittently width-pressed by the inclined portions 102a and 102b and the parallel portions 101a and 101b of the molds 100a and 100b.

  Thereafter, the sizing press device 13 performs opening adjustment and width reduction of the molds 100a and 100b in the same manner as the width reduction process in the third pass described above. As a result, as shown in FIG. The width W2 of the tip 20a is formed (width reduction process in the fourth pass). In the width reduction process of the fourth pass, the portion on the tip 20a side of the material 20 to be rolled is width-pressed by the entire surface of the parallel portions 101a and 101b. After the width reduction of the molds 100a and 100b in the width reduction process of the fourth pass, the tip 20a of the material 20 to be rolled is an end of the parallel parts 101a and 101b of the molds 100a and 100b as shown in FIG. It is located outside. That is, at this time, the tip 20 a protrudes to the exit side of the sizing press device 13. The control unit 5 starts short stroke control of the sizing press device 13 using the protrusion of the tip 20a to the exit side of the sizing press device 13 as a trigger.

  After the fourth pass width reduction process described above, the tip 20a of the material 20 to be rolled protrudes to the exit side of the sizing press device 13. In this state, the control unit 5 performs short stroke control on the sizing press device 13. That is, the sizing press device 13 changes the opening degree of the molds 100 a and 100 b based on the control of the control unit 5. Subsequently, the sizing press device 13 intermittently performs one pass of width reduction of the molds 100a and 100b by the width reduction amount (hereinafter referred to as short stroke amount Δs) at the time of short stroke control instructed by the control unit 5. Implement (5th pass width reduction step). By the width reduction process of the fifth pass, the portion of the material 20 to be rolled away from the tip 20a by the conveyance amount of the material 20 is shown in FIG. 8 from both sides in the width direction of the material 20 to be rolled. The width is pressed by the short stroke amount Δs. As a result, the first step Δa is formed on both sides in the width direction of the material 20 to be rolled. The width W2 of the material 20 to be rolled decreases stepwise from the tip 20a toward the current width press portion with the first step Δa as a boundary.

  Next, the sizing press apparatus 13 changes the opening degree of the molds 100a and 100b in accordance with the width of the width press portion of the material 20 to be rolled in the width reduction process of the fifth pass based on the control of the control unit 5. . Subsequently, as shown in FIG. 9, the sizing press device 13 intermittently performs one-pass width reduction of the molds 100 a and 100 b of the short stroke amount Δs instructed by the control unit 5 (6 passes). Eye width reduction process). As a result of the sixth pass width reduction process, the portion of the material 20 to be rolled away from the width press portion in the fifth pass width reduction step by the transport amount of the material 20 as shown in FIG. The rolled material 20 is width-pressed by a short stroke amount Δs from both sides in the width direction. As a result, a second step Δa is formed on both sides in the width direction of the material 20 to be rolled, and as a result, the wide portion 21 having the two step portions 21a and 21b shown in FIG. 3 is formed. The The second step Δa is the same as the first step Δa in the fifth pass width reduction process described above. The width W2 of the material 20 to be rolled is up to the target width of the material 20 to be rolled, that is, the width W3 of the steady portion 22 shown in FIG. 3, by the first step Δa and the second step Δa. Decreases in steps.

  Here, the width W2 of the material 20 to be rolled was reduced to the target width W3 by the two short stroke controls described above. With this as a trigger, the control unit 5 ends the short stroke control for the sizing press device 13. That is, in the rolled material width control method according to the present embodiment, the short stroke control for forming the step Δa in the rolled material 20 was performed twice.

  Then, the sizing press apparatus 13 adjusts the opening degree of the molds 100a and 100b to the mold opening degree in the width reduction process of the first to third passes based on the control of the control unit 5. Subsequently, as shown in FIG. 10, the sizing press device 13 intermittently performs the width reduction of the molds 100a and 100b having the width reduction amount instructed by the control unit 5 for one pass (the seventh pass). Width reduction step). In the width reduction process of the seventh pass, as shown in FIG. 10, the material to be rolled 20 is intermittently width-pressed by the inclined portions 102a and 102b and the parallel portions 101a and 101b of the molds 100a and 100b. , It is killed to the width W3 (<width W2). As a result, a part of the steady portion 22 having the width W3 is formed on the rear end side of the wide portion 21 in the material 20 to be rolled.

  After the width reduction process of the seventh pass described above, the sizing press device 13 is controlled based on the control of the control unit 5 until the width press of the tail end 20b (see FIG. 3) of the material 20 to be rolled is completed. Similar to the width reduction step, the opening adjustment of the molds 100a and 100b and the width reduction are performed. Specifically, the sizing press device 13 performs a total 30-40 pass width reduction process including the above-described 1-7th width reduction process on the single material 20 to be rolled. As a result, the material to be rolled 20 is formed from the slab shape into a shape including the wide portion 21 and the steady portion 22 as shown in FIG.

  In each of the width reduction processes from the first pass to the final pass described above, the material 20 to be rolled has a predetermined conveyance amount (for example, 450 [mm]) for each width press for one pass. Is continuously or intermittently conveyed in the direction from the entry side to the exit side (see the conveyance direction shown in FIGS. 4 to 10).

  As shown in FIG. 1, the material 20 to be rolled formed by the method for controlling the width of the material to be rolled according to the present embodiment is roughly rolled by the rough rolling device 14 and then finished by the finish rolling device 15. As a result, the rolled plate 25 is formed. The rolled plate 25 has a shape and dimensions required as a rolled product. In particular, the rolled plate 25 has a width required as a rolled product. The width of the rolled plate 25 is uniform from the front end to the tail end of the rolled plate 25. In the present embodiment, the uniform width includes not only the width of the rolled product from the tip to the tail but also the width in which an error allowed as the rolled product occurs.

  Here, as shown in FIG. 3, the wide portion 21 formed on the tip 20a side of the material 20 to be rolled by the above-described material width control method includes two step portions 21a having the same step Δa, 21b. By these two step portions 21a and 21b, the width of the material 20 to be rolled is gradually reduced from the width W2 to the width W3 from the tip 20a to the tail end 20b.

  The wide portion 21 having such a shape contributes to the uniformization of the width of the material 20 to which the material 20 is horizontally rolled from the tip 20a toward the tail 20b. That is, the wide portion 21 is the largest material in a portion where the material easily escapes in the longitudinal direction (conveying direction) of the material 20 to be rolled by horizontal rolling, specifically, the portion extending from the tip 20a to the first step portion 21a. It has a width (= width W2). Further, as the material escape in the longitudinal direction of the material 20 to be rolled due to the horizontal rolling process is less likely to occur from the tip 20a toward the steady portion 22, the width W2 of the wide portion 21 is set to two step portions 21a and 21b. As a result, the width of the steady portion 22 is gradually reduced. With such a shape, the wide portion 21 has a width that decreases due to the material escape in the longitudinal direction of the material 20 to be rolled by horizontal rolling, and the material escape in the width direction of the material 20 to be rolled by horizontal rolling. The difference from the width that increases (stretches) due to the above is reduced. As a result, the width 20 of the rolled material 20 after the horizontal rolling process is uniform from the tip 20a to the tail end 20b without causing a negative width in the rolled material 20 (for example, the rolled plate 25) after the horizontal rolling process. It becomes.

  In addition, the stationary part 22 mentioned above is continuing to the rear end of the wide part 21, as shown in FIG. For this reason, the material escape in the longitudinal direction of the stationary part 22 due to the horizontal rolling process is hardly generated because it is inhibited by the wide part 21 and the like. As a result, the steady portion 22 is horizontally rolled without causing a negative width, and by this horizontal rolling, the width W3 of the steady portion 22 is increased to approximately the width required for the rolled product.

  Next, examples of the present invention will be described. In this example, a steel slab having a width of 1850 [mm] was used as the material to be rolled 20 before width pressing (width killing) by the sizing press device 13. Moreover, the conveyance amount of the to-be-rolled material 20 for every width press with respect to the to-be-rolled material 20 shall be 450 [mm], and it is the sum total with respect to the to-be-rolled material 20 according to the to-be-rolled material width control method (refer FIGS. 4-10) mentioned above. A 30-pass width reduction step was performed. Of the 30 pass width reduction processes for the material 20 to be rolled, in each of the width reduction processes from the 5th pass to the 6th pass (see FIGS. 8 and 9), the short stroke amount Δs of one time is 10 [mm]. As described above, the width reduction of the molds 100a and 100b based on the short stroke control was performed in two steps. By each width reduction process under such conditions, the material to be rolled 20 is killed by about 187 [mm], and two steps having a step Δa of 10 [mm] on the tip 20a side of the material to be rolled 20 are killed. Step portions 21a and 21b were formed (see FIG. 3).

  Thereafter, as shown in FIG. 1, the material 20 to be rolled sent from the sizing press device 13 is roughly rolled by the rough rolling device 14, and then the material 20 after the rough rolling is finished to the finish rolling device 15. Then, finish rolling was performed, whereby a rolled plate 25 was manufactured. The width of the rolled plate 25 was measured from the front end to the tail end of the rolled plate 25 thus manufactured.

  FIG. 11 is a diagram showing an example of the width measurement result of the rolled sheet according to the example of the present invention. In FIG. 11, the vertical axis represents the width W [mm] of the rolled plate 25, and the horizontal axis represents the length L [mm] of the rolled plate 25. The length L is the length from the tail end of the rolled plate 25. That is, when the rolled plate 25 is of the full length L1, the position of the length L = 0 is the tail end of the rolled plate 25, and the position of the length L = L1 is the tip of the rolled plate 25.

  As shown in FIG. 11, the width W of the rolled plate 25 of the present embodiment does not fall below the target width Wm of the rolled product in the entire region from the front end to the tail end of the rolled plate 25, and this target width Wm. The necessary and sufficient margin was secured. Further, the error in the width of the rolled plate 25 from the front end to the tail end of the rolled plate 25 (hereinafter referred to as error width ΔW) is sufficiently small to fall within the error range allowed for the rolled product. That is, the rolled plate 25 of the present embodiment has a uniform width W from the tip to the tail, and is good without causing a minus width. Such a rolled material 25 can be shipped as a rolled product such as a coil.

(Comparative Example 1)
Next, Comparative Example 1 for the above-described embodiment will be described. In this comparative example 1, the width reduction of the molds 100a and 100b based on the short stroke control was set to one time, and the short stroke amount Δs at this time was set to 15 [mm]. Except for this short stroke control condition, a width reduction process of 30 passes in total for the material 20 to be rolled was performed under the same conditions as in the above-described example. As a result, the material to be rolled 20 was killed by about 187 [mm], and one step portion having a step Δa of 15 [mm] was formed on the tip 20a side of the material 20 to be rolled.

  Thereafter, similarly to the above-described example, the rolled material 20 of the present comparative example 1 was subjected to rough rolling and finish rolling, and thereby the rolled plate 25 of the present comparative example 1 was manufactured. Thus, the width | variety of the rolled sheet 25 of the comparative example 1 manufactured was measured by the method similar to the Example mentioned above.

  FIG. 12 is a diagram illustrating an example of the width measurement result of the rolled sheet of Comparative Example 1 with respect to the Example of the present invention. The vertical axis and horizontal axis shown in FIG. 12 are the same as those in the above-described embodiment (see FIG. 11). As shown in FIG. 12, the rolled plate 25 of Comparative Example 1 has a narrow portion where the width W is steep and excessively reduced in the longitudinal direction of the rolled plate 25. The width W of the narrow portion was much smaller than the target width Wm of the rolled product (specifically, 10 [mm] or more), as shown in the broken line region of FIG. That is, the rolled sheet 25 of Comparative Example 1 deviated from the error range of the width W allowed as a rolled product, and a steep and excessive width minus was generated. The rolled material 25 having such a negative width does not satisfy the requirements as a rolled product and is discarded.

(Comparative Example 2)
Next, Comparative Example 2 for the above-described embodiment will be described. In Comparative Example 2, the short stroke amount Δs was set to 7.5 [mm]. Except for the condition of the short stroke amount Δs, the width reduction process of a total of 30 passes on the material 20 to be rolled was performed under the same conditions as in the above-described example. As a result, the to-be-rolled material 20 is killed by about 187 [mm], and two step portions 21a and 21b having a step Δa of 7.5 [mm] are formed on the tip 20a side of the to-be-rolled material 20. Formed.

  Thereafter, similarly to the above-described example, the rolled material 20 of the present comparative example 2 was subjected to rough rolling and finish rolling, thereby producing the rolled plate 25 of the present comparative example 2. Thus, the width | variety of the rolled sheet 25 of the comparative example 2 manufactured was measured by the method similar to the Example mentioned above.

  FIG. 13: is a figure which shows an example of the width measurement result of the rolled sheet of the comparative example 2 with respect to the Example of this invention. The vertical axis and horizontal axis shown in FIG. 13 are the same as those in the above-described embodiment (see FIG. 11). As shown in FIG. 13, the width W of the rolled sheet 25 of the present comparative example 2 does not fall below the target width Wm of the rolled product in the entire region extending from the front end to the tail end of the rolled sheet 25, and this target width. Necessary and sufficient margin was secured for Wm. In addition, the error width ΔW of the rolled plate 25 of Comparative Example 2 is larger than that of the above-described embodiment, but is within a range that is acceptable as a rolled product. In other words, the rolled plate 25 of Comparative Example 2 has a uniform width W from the tip to the tail, and does not cause a negative width. Such a rolled material 25 of Comparative Example 2 can be shipped as a rolled product such as a coil as in the case of the above-described embodiment.

(Comparative Example 3)
Next, Comparative Example 3 for the above-described embodiment will be described. In Comparative Example 3, the short stroke amount Δs was set to 15 [mm]. Except for the condition of the short stroke amount Δs, the width reduction process of a total of 30 passes on the material 20 to be rolled was performed under the same conditions as in the above-described example. As a result, the material to be rolled 20 was killed by about 187 [mm], and two step portions 21a and 21b having a step Δa of 15 [mm] were formed on the tip 20a side of the material 20 to be rolled. .

  Thereafter, similarly to the above-described example, the rolled material 20 of the present comparative example 3 was subjected to rough rolling and finish rolling, thereby producing the rolled plate 25 of the present comparative example 3. Thus, the width | variety of the rolled sheet 25 of the comparative example 3 manufactured was measured by the method similar to the Example mentioned above.

  FIG. 14 is a diagram illustrating an example of the width measurement result of the rolled sheet of Comparative Example 3 with respect to the Example of the present invention. Note that the vertical axis and horizontal axis shown in FIG. 14 are the same as those in the above-described embodiment (see FIG. 11). As shown in FIG. 14, the width W of the rolled plate 25 of Comparative Example 3 is not less than the target width Wm of the rolled product in the entire region extending from the front end to the tail end of the rolled plate 25, and this target width. Necessary and sufficient margin was secured for Wm. In addition, the error width ΔW of the rolled plate 25 of Comparative Example 3 is larger than that of the above-described embodiment, but is within a range that is acceptable as a rolled product. In addition, as shown in the broken-line area | region of FIG. 14, the width dent resulting from the width reduction by short stroke control had generate | occur | produced in the rolled sheet 25 of this comparative example 3. FIG. However, since this width dent is not less than the target width Wm of the rolled product, no negative width is generated. That is, the rolled plate 25 of Comparative Example 3 has a uniform width W from the tip to the tail, and does not cause a negative width. The rolled material 25 of Comparative Example 3 can be shipped as a rolled product such as a coil as in the case of the above-described embodiment.

  Here, as a result of comparing the above-described example and Comparative Examples 2 and 3, the error width ΔW of the rolled sheet 25 is the smallest without causing a minus width, and further, an unintended narrowing such as a width dent. It has been found that an embodiment in which no width portion is generated is the best. That is, the short stroke control is started by using the tip 20a of the material 20 to be projected to the exit side of the sizing press device 13 as a trigger, and the short stroke control with the short stroke amount Δs of 10 [mm] is performed twice. ,carry out. Thus, two stepped portions where the width W2 of the material 20 to be rolled gradually decreases from the tip 20a of the material 20 to the tail 20b to the width W3 of the steady portion 22 on the material 20 tip 20a side. 21a and 21b are formed, and these two step portions 21a and 21b are set to the same step Δa = 10 [mm]. This is the most effective in reducing the error width of the rolled plate 25, making the width of the rolled plate 25 uniform, and preventing the negative width in the rolled plate 25.

  In addition, the effect by this invention is not only the Example mentioned above or the comparative examples 2 and 3, but the reduction amount (width killing amount) of the width direction of the to-be-rolled material 20 is 100 [mm] or more, or When the width of the rolled product (rolled plate, coil, etc.) was 1200 [mm] or more, it was similarly obtained. Of course, the effects of the present invention can be obtained in the same manner even when the width killing amount of the material 20 to be rolled is less than 100 [mm] or the width of the rolled product is less than 1200 [mm].

  As described above, in the embodiment of the present invention, the mold opening of the sizing press device is adjusted in accordance with the width of the material to be rolled during the period in which the tip of the material to be rolled is located in the sizing press device. However, the width of the material to be rolled is pressed, and the width of the material to be rolled is changed by changing the die opening of the sizing press device during the period when the tip of the material to be rolled protrudes to the exit side of the sizing press device. Thus, a plurality of step portions in which the width of the material to be rolled decreases to the target width of the material to be rolled from the front end side to the tail end side of the material to be rolled are formed in the material to be rolled.

  For this reason, the width | variety of a to-be-rolled material is increasing in steps as it becomes easy to generate | occur | produce the material escape to the longitudinal direction of the to-be-rolled material by a horizontal rolling process. As a result, the difference between the width that decreases due to the material escape in the longitudinal direction of the material to be rolled by horizontal rolling and the width that increases due to material escape in the width direction of the material to be rolled by horizontal rolling. Can be reduced. As a result, it is possible to prevent a negative width from occurring in the material to be rolled and the rolled sheet after finish rolling, and thereby the width of the rolled product can be made uniform over its entire length, so that the width required for the rolled product can be reduced. The width accuracy of the rolled product after manufacture can be improved.

  By making the width uniform and improving the width accuracy of the rolled product as described above, it is possible to reduce the incidence of defective products due to the minus width, and as a result, it is possible to suppress wasteful loss of the material to be rolled, Yield can be improved. For example, the yield of rolled products can be expected to be 0.02 [%] or higher compared to the prior art.

  In the above-described embodiment, the wide portion 21 having the two step portions 21a and 21b is formed on the tip 20a side of the material 20 to be rolled. However, the present invention is not limited to this. That is, if the width W2 of the material 20 to be rolled is reduced to the target width W3 from the tip 20a side to the tail end 20b side of the material 20 to be rolled, the number of steps in the wide portion 21 is 3 It may be more than one.

  Moreover, in embodiment mentioned above, although the two level | step-difference parts 21a and 21b were made into the same level | step difference (DELTA) a, not only this but each level | step difference of the several level | step-difference part formed in the to-be-rolled material 20 is the same. For example, there may be a difference within a predetermined range between the steps. Specifically, with respect to the step Δa of the stepped portion 21a, the stepped portion of the subsequent stepped portion 21b may be set to Δa ± 5 [mm].

  Further, in the above-described embodiment, the short stroke amount Δs by the sizing press device 13 is calculated by the arithmetic processing unit 4, but not limited thereto, the short stroke amount Δs is a fixed value (for example, 10 A suitable value such as [mm] may be fixed.

  In the above-described embodiment, the short stroke control is performed in the width reduction processes of the fifth pass and the sixth pass, but the present invention is not limited to this. That is, the short stroke control starts at the timing when the tip 20a of the material 20 to be rolled protrudes from the exit side of the sizing press device 13, and is continued until the width of the material 20 after the width pressing reaches the target width W3. That's fine.

  Further, the present invention is not limited by the above-described embodiment, and the present invention includes a configuration in which the above-described constituent elements are appropriately combined. For example, the material 20 to be rolled may be a steel material or a metal material other than a steel material such as copper or aluminum. In addition, all other embodiments, examples, operation techniques, and the like made by those skilled in the art based on the above-described embodiments are included in the present invention.

DESCRIPTION OF SYMBOLS 1 Rolled material width control apparatus 2 Input part 3 Display part 4 Arithmetic processing part 5 Control part 9 Management database 9a Order information 10 Hot rolling line 11 Heating furnace 12 Conveying apparatus 12a Conveying roll 13 Sizing press apparatus 14 Rough rolling apparatus 14a Rough Rolling mill 14b Edger roll 15 Finishing rolling mill 15a Finishing rolling mill 16 Coiler 20 Rolled material 20a Tip 20b Tail 21 Wide part 21a, 21b Step part 22 Steady part 25 Rolled plate 100a, 100b Mold 101a, 101b Parallel part 102a , 102b inclined portion 103a, 103b width reduction device

Claims (6)

Rolled material width control for controlling the width of the material to be rolled by using a width press device that presses a die from both sides in the width direction of the material to be rolled and performs width pressing of the material to be rolled. In the device
Based on the transport amount of the material to be rolled for each width press, it is determined whether or not the tip of the material to be rolled protrudes from the exit side of the width press device, and the tip of the material to be rolled is the width. period located within a press device, wherein in response to the width of the material to be rolled have line widths press the material to be rolled while adjusting the degree of opening of the mold, the width of the material to be rolled before width press The width press apparatus is controlled so as to form a wide tip having a width smaller than the target width of the material to be rolled after width pressing and having a larger width than the target width of the material to be rolled. During the period in which the front end protrudes to the exit side of the width press device, the opening of the mold is changed to perform width pressing of the material to be rolled, and the material to be rolled is moved from the front end side to the tail end side of the material to be rolled. a plurality of step portions in which the width of the rolled material is reduced from the width of the wide tip the to the target width, the plurality of stepped portions Wherein a constant region having the target width as a constant width from an end portion having an inner the target width to the tail end of the material to be rolled to form a rolled material, a control unit for controlling the width pressing device A rolled material width control apparatus comprising the rolled material width control apparatus.   The said control part controls the said width press apparatus so that the two said level | step-difference part may be formed, The to-be-rolled material width control apparatus of Claim 1 characterized by the above-mentioned.   The rolled material width control device according to claim 1, wherein the control unit controls the width press device so that each step of the plurality of step portions is the same. Rolled material width control for controlling the width of the material to be rolled by using a width press device that presses a die from both sides in the width direction of the material to be rolled and performs width pressing of the material to be rolled. In the method
The period during which the leading end of the rolled material is located in the width pressing the device, wherein in response to the width of the material to be rolled performs width press said material to be rolled while adjusting the degree of opening of the mold, the width pressing before Forming a wide tip on the material to be rolled that is smaller than the width of the material to be rolled and has a larger width than the target width of the material to be rolled after width pressing.
During the period when the tip of the material to be rolled protrudes to the exit side of the width press device, the opening of the die is changed to perform width pressing of the material to be rolled, and from the tip side to the tail end side of the material to be rolled A plurality of step portions in which the width of the material to be rolled decreases from the width of the wide tip to the target width, and the tail of the material to be rolled from the end portion having the target width among the plurality of step portions. A rolling material width control method, comprising: forming a steady portion having the target width as a constant width to the end of the rolling material.   The method for controlling the width of the material to be rolled according to claim 4, wherein the two step portions are formed on the material to be rolled.   The method for controlling the width of a material to be rolled according to claim 4 or 5, wherein the steps of the plurality of steps are made the same.

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