JP6060874B2 - Thick plate rolling method - Google Patents

Description

  The present invention relates to a thick plate rolling method for rolling, for example, a thick plate (thick steel plate) having a thickness of 6 mm or more, and is provided with a turning table for turning a rolled material on the entry side and the exit side of a rolling mill. It is suitable for the plate rolling process.

  Various types of thick plate rolling are performed in the thick plate rolling process at the steelworks. The rolling mill in the plate rolling process is characterized by the ability to rotate the rolling roll forward and backward, and a rolling table is generally provided on the entry side and exit side of the rolling mill for turning the rolling material (also called slab). It has been. As a thick plate rolling method of the thick plate rolling process in which such a turning table is provided on the entry side and the exit side of the rolling mill, for example, there is one described in Patent Document 1 below. This thick plate rolling method is intended to reduce the time required for rolling by rolling the subsequent material of the rolled material during the rotation of the preceding material of the rolled material, or by rotating the subsequent material during the rolling of the preceding material. To do.

Japanese Patent Laid-Open No. 11-188406

The plate rolling process is generally performed in the order of forming rolling, tentering rolling, and thickening rolling. In some cases, forming and rolling are not performed. Therefore, when the required plate thickness of the thick plate product is large, a rolling material having a large plate thickness is required for at least the rolling thickness and the rolling thickness of the thickness rolling. In general, there is a limit to the thickness of the rolled material that can be produced by the continuous casting method, so a rolled material having a thickness larger than that must be cast, for example, by the ingot casting method. The casting method has a lower yield and higher cost than the continuous casting method. Therefore, the conventional thick plate rolling method has room for improvement in productivity of thick plate products.
The present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide a thick plate rolling method capable of improving the productivity of thick plate products.

In order to solve the above-described problems, the thick plate rolling method of the present invention is a computer having a calculation function for obtaining a thick plate product by performing only tenter rolling on a rolled material not subjected to forming rolling . in a thick plate rolling method that will be controlled by the processing, molding rolling a value obtained by adding a margin length product length of plank products are the material length of the rolling stock which is not subjected is required equal to or greater than In addition, the product value of the material thickness and material width of the rolled material not subjected to forming and rolling is divided by the product thickness of the required thick plate product is equal to or greater than the product width plus the margin. If it is determined that it is possible to obtain a plate product by performing only tenter rolling on the rolled material, and width for a rolled material that is determined to be obtained only by tenter rolling Only the rolling out is performed as a rolling process .

Further, in the determination , the diagonal length of the rolled material after further rolling out the rolled material that has not been subjected to forming rolling to obtain the product thickness is calculated, and the calculated diagonal length is is smaller than the guide maximum opening of the turn table, it is determined that can acquire a rolled product by performing only tentering rolling for the rolling stock, only tentering rolling for determining the rolling stock It is characterized by being performed as a rolling process.

  Thus, according to the thick plate rolling method of the present invention, it is executed by a computer having a calculation function in order to obtain a thick plate product by performing only the tenter rolling on the rolled material. In this plate rolling method, the product length of the material thickness of the rolled material and the material width is equal to or greater than the value obtained by adding the extra length to the product length of the plate product requiring the material length of the rolled material. When the value obtained by dividing the required product thickness by the product thickness is equal to or greater than the product width plus the margin, obtain the plate product by performing only tenter rolling on the rolled material. Detect as possible. For the detected rolled material, only tenter rolling is performed as a rolling process. Therefore, the thick plate material that only performs the tentering rolling may be a thick plate material that allows only the rolling thickness of the tentering rolling, reducing the thick plate material by the ingot casting method, and the thick plate material by the continuous casting method. Since the number of materials can be increased, the yield is improved by that amount, and the cost is reduced, so that productivity is improved.

  Further, when the diagonal length of the rolled material after completion of rolling is smaller than the maximum opening of the guide in the turning table, it is detected that the rolled material can be obtained by performing only the tenter rolling on the rolled material. Therefore, the rolled material that is rotated by the turning table does not interfere with the guide, and the rolled product can be obtained reliably by performing only the tentering rolling as the rolling process for the detected rolled material.

It is a schematic block diagram of the plate rolling process with which the plate rolling method of this invention was applied. It is a top view of the turntable of FIG. It is a flowchart which shows the arithmetic processing for the rolling raw material detection which performs only the tentering rolling performed with the process computer of FIG. It is a flowchart which shows the arithmetic processing of the rolling process which performs only the tentering rolling performed with the process computer of FIG. It is explanatory drawing of an effect | action of the arithmetic processing of FIG.3 and FIG.4. It is explanatory drawing of a general thick plate rolling process.

  Next, an embodiment of the thick plate rolling method of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a thick plate rolling step (rough rolling step) to which the thick plate rolling method of the present embodiment is applied. The left side of the figure is the entry side of the process, the right side of the figure is the exit side of the process, for example, the heating furnace 3 exists on the left side of the figure, and the correction process by the hot leveler 5 is also on the right side of the figure. Exists. In the figure, reference numeral 1 denotes a rolling mill, which is the rolling mill 1 in the thick plate rolling process, so that the rolling roll 2 of the rolling mill 1 can rotate forward and backward. That is, rolling is repeated by reciprocating the rolling material S to the rolling mill 1. Turning tables 4 are arranged on the entry side and the exit side of the rolling mill 1. FIG. 2 is a plan view of the turntable 4. In this turning table 4, for example, rollers 6 having a large radius by half in the axial direction are alternately arranged in the reverse direction in the plate passing direction. Therefore, for example, the roller 6 having a large radius in the right half of the figure is rotated so as to convey the rolled material upward, and the roller 6 having a large radius in the left half of the figure is rotated so as to convey the rolled material downward. For example, the rolling material S on the turning table 4 is turned counterclockwise in the figure. In addition, the code | symbol 7 in a figure is a guide which guides the rolling raw material S to the width direction, ie, the direction which cross | intersects the sheet passing direction, and an opening degree (space | interval) is adjusted according to the width | variety of the rolling raw material S before and behind rolling. As shown in the figure, during the rolling of the rolled material S, the opening degree is adjusted so as not to hinder the turning.

  This thick plate rolling process is controlled by a process computer (computer) 8 having a calculation function. The process computer 5 controls, for example, the heating state by the heating furnace 3, the rolling state of the rolling mill 1, the conveyance / turning state by the turning table 4, and the correction state by the hot leveler 5. FIG. 6 is an explanatory diagram of a general thick plate rolling process, in which the left side of the figure is shown as the input side, that is, the upstream side in the sheet passing direction, and the right side of the figure is shown as the exit side, that is, the downstream side in the sheet passing direction. The rolling is performed by reciprocating the rolling material S to and from the rolling mill 1). Moreover, the white double-directional arrow in the figure indicates the length direction of the rolled material S. In this general thick plate rolling process, as shown in FIG. 6A, for example, the rolling of the rolling material S is performed while the length direction of the rolling material S is matched with the plate direction. Next, as shown in FIG. 6b, the rolled material S that has been formed and rolled is turned 90 ° in the horizontal direction on the turning table 4 and rolled out in a state in which the width direction of the rolled material S matches the plate direction. I do. That is, the material width of the rolled material S is set to a value obtained by adding a margin width to the product width of the thick plate product by the tenter rolling. Next, as shown in FIG. 6 c, the rolled material S that has been subjected to tenter rolling is turned 90 ° in the horizontal direction on the turning table 4, and the length of the rolled material S is adjusted to match the plate direction. Roll out. That is, the thickness of the rolled material S is changed to the thickness of the thick plate product by the thickness rolling, and the length of the rolled material S is set to a value obtained by adding a margin length to the product length of the rolled product. The margin width and the margin length both depend on the variation in the rolling process and the length of the test piece. As is well known, rolling performed by a rotating rolling roll hardly extends in the direction intersecting the sheet passing direction.

  In the thick plate rolling of this embodiment, in addition to the general thick plate rolling method described above, the thick plate rolling method only by the tentering rolling described above is performed. This thick plate rolling method will be described with reference to the flowchart of FIG. 3 performed by the process computer 8 of FIG. This calculation process is performed before information on required thick plate products, for example, product specifications, is input, and the thick plate material S for obtaining those products is loaded into the plate rolling process. In this calculation process, first, in step S1, whether there is a rolled material S that is equal to or greater than a value obtained by adding a margin length to the product length of a specific thick plate product for which the material length of the rolled material S is required. It is determined whether or not, and when the corresponding rolled material S exists, the process proceeds to step S2, and otherwise returns.

In the step S2, the product value of the material thickness and the material width of the rolled material S between the rolled material S existing in the step S1 and the specified required thick plate product is determined as the product thickness of the rolled product. It is determined whether or not the value divided by is equal to or greater than the value obtained by adding the margin width to the product width. If it is equal to or greater, the process proceeds to step S3, and if not, the process returns.
In step S3, the diagonal length of the rolled material S after completion of rolling is obtained for the rolled material S determined in step S2, and the diagonal length is smaller than the maximum opening of the guide 7 in the turning table 4. If the diagonal length of the rolled material S is smaller than the maximum opening of the guide 7, the process proceeds to step S4, and otherwise returns. The diagonal length is calculated as ((material length) ² + (material length × material width / product thickness) ² ) ^1/2 .
In step S4, the rolling material S determined in step S3 is returned to a specific flag for performing only tentering rolling, assuming that it becomes a (specific) rolling product required only by tentering rolling. .

  Next, calculation processing performed by the process computer 8 of FIG. 1 in order to control the rolling state of the rolling mill 1 by a thick plate rolling method only by tenter rolling will be described with reference to the flowchart of FIG. In this calculation process, first, in step S11, it is determined whether or not a specific flag for performing only tentering rolling is given to the rolling material S charged in the rolling mill 1, and only tentering rolling is performed. If the specific flag is given, the process proceeds to step S12, and if not, the process returns.

In step S12, an instruction to perform only the tenter rolling for thick rolling is output for the charged rolling material S, and then the process returns.
According to these calculation processes, whether there is a rolled material S that is equal to or greater than a value obtained by adding a margin length to the product length of a specific thick plate product for which the material length of the rolled material S is required. If the corresponding rolled material S exists, the product value of the material thickness and the material width of the rolled material S is determined between the rolled material S and the specified thick plate product specified. It is determined whether the value divided by the product thickness of the rolled product is equal to or greater than the value obtained by adding the margin width to the product width. If the value is equal to or greater, the diagonal of the rolled material S after completion of rolling is determined. It is determined whether or not the length is smaller than the maximum opening of the guide 7 in the turning table 4, and when the diagonal length of the rolling material S is smaller than the maximum opening of the guide 7, A specific flag for performing only tenter rolling is given.

  And about the rolling raw material S to which the specific flag which performs only this tentering rolling was provided, only tentering rolling is performed and thick plate rolling is completed. When performing only tentering rolling, for example, as shown in FIG. 5a, the rolling material S is first turned 90 ° horizontally by the turning table 4, and then the longitudinal direction of the rolling material S is shown in FIG. 5b. Rolling out is performed by the rolling mill 1 in a direction crossing the sheet passing direction. When the tenter rolling is completed, the rolling material S is again turned 90 ° in the horizontal direction by the turning table 4, the length direction of the rolling material S is made to coincide with the plate direction, and the raw material is discharged to the next process as it is. In the tenter rolling, since the rolled material S hardly extends in the length direction, if the length of the rolled material S is equal to or greater than the product length of the rolled product plus the extra length, after the completion of rolling. Satisfies the plate length. The margin length in this case indicates, for example, a value obtained by adding a length corresponding to a variation in product length in the rolling process and a length of a test piece for performing a material test. In addition, since the rolled material S does not extend in the length direction in the tenter rolling, similarly, the product value of the material thickness and the material width of the rolled material is divided by the product thickness of the required thick plate product. If the value is equal to or greater than the value obtained by adding the margin width to the product width, the product width and the product thickness can be satisfied simultaneously by performing only the tentering rolling. In addition, the margin width in this case shows the value equivalent to the variation in the product width in a rolling process, for example.

  Moreover, in the said calculation process, the diagonal length of the rolling raw material S after completion of rolling is calculated, it is determined whether the diagonal length is smaller than the maximum opening degree of the guide 7 in the turning table 4, and a rolling raw material is determined. When the diagonal length of S is smaller than the maximum opening of the guide 7, a specific flag for performing only tentering rolling is given to the rolled material S. As a restriction on equipment, it is determined whether the rolling material S being rolled on the turning table 4 does not interfere with the guide 7, and the diagonal length of the rolling material S is the maximum opening of the guide 7. If it is smaller, the rolling material S being rotated does not interfere with the guide 7, so that the thick plate rolling can be completed only by the tentering rolling.

  In this way, the thick plate rolling method of this embodiment that completes thick plate rolling only by tenter rolling is required for the rolled material S as compared with the conventional thick plate rolling method that performs at least tenth rolling and thickening rolling. The thickness may be small. That is, the rolling material S by the ingot casting method required in the conventional thick plate rolling method that performs at least tenth rolling and thickening rolling is replaced with the rolling material S by the continuous casting method having a smaller thickness. Is possible. As is well known, the rolled material S manufactured by the ingot casting method has a poor yield and a high cost. If this can be replaced with the rolling material S by the continuous casting method, which is excellent in yield and low in cost, the productivity is improved accordingly. As an example of the cost merit by the thick plate rolling method of the present embodiment, a thick plate product of 100 ton / month is manufactured by thick plate rolling only by tenter rolling, and as a result, the rolling material S by the ingot casting method of 10 ton / month. Is replaced with the rolling material S by the continuous casting method. When the cost difference between the rolled material S by the ingot casting method and the rolled material S by the continuous casting method is 34,000 yen / ton, the annual cost merit is 10 tons / month × 34,000 yen / ton × 12 months / year = 4.1 million yen / year.

  As described above, in the thick plate rolling method of the present embodiment, the process computer 8 having the calculation function is used to obtain the thick plate product by performing only the tenter rolling on the rolled material S. In this plate rolling method, the material length of the rolled material S is equal to or greater than the value obtained by adding the extra length to the product length of the plate product required, and the product of the material thickness of the rolled material S and the material width. When the value obtained by dividing the value by the product thickness of the required plate product is equal to or greater than the product width plus the margin width, the rolled material S is only subjected to tenter rolling and the plate Detect that a product is available. For the detected rolled material S, only tenter rolling is performed as a rolling process. Therefore, the thick plate material S that performs only the tentering rolling may be a thick plate material S that allows only the rolling thickness of the tentering rolling. The thick plate material S is reduced by the ingot casting method, and the continuous casting method. Since the thick plate material S can be increased, the yield is improved by that amount, and the cost is reduced, so that the productivity is improved.

  In addition, when the diagonal length of the rolled material S after completion of rolling is smaller than the maximum opening of the guide 7 in the turning table 4, it is possible to obtain a rolled product by performing only the tenter rolling on the rolled material S. To detect. Therefore, the rolling material S rotated by the turning table 4 does not interfere with the guide 7, and the rolled product is reliably obtained by performing only the tentering rolling as the rolling process on the detected rolling material S. be able to.

1 Rolling Machine 2 Rolling Roll 3 Heating Furnace 4 Turning Table 5 Hot Leveler 6 Roller 7 Guide 8 Process Computer (Computer)
S Rolling material

Claims (2)

A thick plate rolling method that will be controlled by the processing of the computer having a calculation function for forming rolled to obtain a thick plate product performed only tentering rolled against decorated with non rolling stock,
The material of the rolled material that is equal to or greater than the value obtained by adding the extra length to the product length of the thick plate product for which the material length of the rolled material that is not subjected to the formed rolling is applied. When the product of thickness and material width divided by the product thickness of the required plate product is equal to or greater than the product width plus the margin, the rolling material is rolled out. It is determined that it is possible to obtain a thick plate product,
A thick plate rolling method, wherein only the tenter rolling is performed as a rolling step for a rolling material that is determined to be capable of obtaining a thick plate product by performing only the tenter rolling. In the determination , furthermore, the diagonal length of the rolled material after performing the tenter rolling on the rolled material that has not been subjected to the forming rolling to obtain the product thickness is calculated, and the calculated diagonal length slab rolling method of claim 1 but which is smaller than the guide maximum opening of the turning table, and judging allow obtaining a rolled product by performing only tentering rolling for the rolling stock .

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